Revert "Bump crypto/ssh package" (#9775)

vendor/golang.org/x/crypto/curve25519/curve25519.go

@@ -0,0 +1,841 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// We have a implementation in amd64 assembly so this code is only run on
+// non-amd64 platforms. The amd64 assembly does not support gccgo.
+// +build !amd64 gccgo appengine
+
+package curve25519
+
+// This code is a port of the public domain, "ref10" implementation of
+// curve25519 from SUPERCOP 20130419 by D. J. Bernstein.
+
+// fieldElement represents an element of the field GF(2^255 - 19). An element
+// t, entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77
+// t[3]+2^102 t[4]+...+2^230 t[9]. Bounds on each t[i] vary depending on
+// context.
+type fieldElement [10]int32
+
+func feZero(fe *fieldElement) {
+	for i := range fe {
+		fe[i] = 0
+	}
+}
+
+func feOne(fe *fieldElement) {
+	feZero(fe)
+	fe[0] = 1
+}
+
+func feAdd(dst, a, b *fieldElement) {
+	for i := range dst {
+		dst[i] = a[i] + b[i]
+	}
+}
+
+func feSub(dst, a, b *fieldElement) {
+	for i := range dst {
+		dst[i] = a[i] - b[i]
+	}
+}
+
+func feCopy(dst, src *fieldElement) {
+	for i := range dst {
+		dst[i] = src[i]
+	}
+}
+
+// feCSwap replaces (f,g) with (g,f) if b == 1; replaces (f,g) with (f,g) if b == 0.
+//
+// Preconditions: b in {0,1}.
+func feCSwap(f, g *fieldElement, b int32) {
+	var x fieldElement
+	b = -b
+	for i := range x {
+		x[i] = b & (f[i] ^ g[i])
+	}
+
+	for i := range f {
+		f[i] ^= x[i]
+	}
+	for i := range g {
+		g[i] ^= x[i]
+	}
+}
+
+// load3 reads a 24-bit, little-endian value from in.
+func load3(in []byte) int64 {
+	var r int64
+	r = int64(in[0])
+	r |= int64(in[1]) << 8
+	r |= int64(in[2]) << 16
+	return r
+}
+
+// load4 reads a 32-bit, little-endian value from in.
+func load4(in []byte) int64 {
+	var r int64
+	r = int64(in[0])
+	r |= int64(in[1]) << 8
+	r |= int64(in[2]) << 16
+	r |= int64(in[3]) << 24
+	return r
+}
+
+func feFromBytes(dst *fieldElement, src *[32]byte) {
+	h0 := load4(src[:])
+	h1 := load3(src[4:]) << 6
+	h2 := load3(src[7:]) << 5
+	h3 := load3(src[10:]) << 3
+	h4 := load3(src[13:]) << 2
+	h5 := load4(src[16:])
+	h6 := load3(src[20:]) << 7
+	h7 := load3(src[23:]) << 5
+	h8 := load3(src[26:]) << 4
+	h9 := load3(src[29:]) << 2
+
+	var carry [10]int64
+	carry[9] = (h9 + 1<<24) >> 25
+	h0 += carry[9] * 19
+	h9 -= carry[9] << 25
+	carry[1] = (h1 + 1<<24) >> 25
+	h2 += carry[1]
+	h1 -= carry[1] << 25
+	carry[3] = (h3 + 1<<24) >> 25
+	h4 += carry[3]
+	h3 -= carry[3] << 25
+	carry[5] = (h5 + 1<<24) >> 25
+	h6 += carry[5]
+	h5 -= carry[5] << 25
+	carry[7] = (h7 + 1<<24) >> 25
+	h8 += carry[7]
+	h7 -= carry[7] << 25
+
+	carry[0] = (h0 + 1<<25) >> 26
+	h1 += carry[0]
+	h0 -= carry[0] << 26
+	carry[2] = (h2 + 1<<25) >> 26
+	h3 += carry[2]
+	h2 -= carry[2] << 26
+	carry[4] = (h4 + 1<<25) >> 26
+	h5 += carry[4]
+	h4 -= carry[4] << 26
+	carry[6] = (h6 + 1<<25) >> 26
+	h7 += carry[6]
+	h6 -= carry[6] << 26
+	carry[8] = (h8 + 1<<25) >> 26
+	h9 += carry[8]
+	h8 -= carry[8] << 26
+
+	dst[0] = int32(h0)
+	dst[1] = int32(h1)
+	dst[2] = int32(h2)
+	dst[3] = int32(h3)
+	dst[4] = int32(h4)
+	dst[5] = int32(h5)
+	dst[6] = int32(h6)
+	dst[7] = int32(h7)
+	dst[8] = int32(h8)
+	dst[9] = int32(h9)
+}
+
+// feToBytes marshals h to s.
+// Preconditions:
+//   |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+//
+// Write p=2^255-19; q=floor(h/p).
+// Basic claim: q = floor(2^(-255)(h + 19 2^(-25)h9 + 2^(-1))).
+//
+// Proof:
+//   Have |h|<=p so |q|<=1 so |19^2 2^(-255) q|<1/4.
+//   Also have |h-2^230 h9|<2^230 so |19 2^(-255)(h-2^230 h9)|<1/4.
+//
+//   Write y=2^(-1)-19^2 2^(-255)q-19 2^(-255)(h-2^230 h9).
+//   Then 0<y<1.
+//
+//   Write r=h-pq.
+//   Have 0<=r<=p-1=2^255-20.
+//   Thus 0<=r+19(2^-255)r<r+19(2^-255)2^255<=2^255-1.
+//
+//   Write x=r+19(2^-255)r+y.
+//   Then 0<x<2^255 so floor(2^(-255)x) = 0 so floor(q+2^(-255)x) = q.
+//
+//   Have q+2^(-255)x = 2^(-255)(h + 19 2^(-25) h9 + 2^(-1))
+//   so floor(2^(-255)(h + 19 2^(-25) h9 + 2^(-1))) = q.
+func feToBytes(s *[32]byte, h *fieldElement) {
+	var carry [10]int32
+
+	q := (19*h[9] + (1 << 24)) >> 25
+	q = (h[0] + q) >> 26
+	q = (h[1] + q) >> 25
+	q = (h[2] + q) >> 26
+	q = (h[3] + q) >> 25
+	q = (h[4] + q) >> 26
+	q = (h[5] + q) >> 25
+	q = (h[6] + q) >> 26
+	q = (h[7] + q) >> 25
+	q = (h[8] + q) >> 26
+	q = (h[9] + q) >> 25
+
+	// Goal: Output h-(2^255-19)q, which is between 0 and 2^255-20.
+	h[0] += 19 * q
+	// Goal: Output h-2^255 q, which is between 0 and 2^255-20.
+
+	carry[0] = h[0] >> 26
+	h[1] += carry[0]
+	h[0] -= carry[0] << 26
+	carry[1] = h[1] >> 25
+	h[2] += carry[1]
+	h[1] -= carry[1] << 25
+	carry[2] = h[2] >> 26
+	h[3] += carry[2]
+	h[2] -= carry[2] << 26
+	carry[3] = h[3] >> 25
+	h[4] += carry[3]
+	h[3] -= carry[3] << 25
+	carry[4] = h[4] >> 26
+	h[5] += carry[4]
+	h[4] -= carry[4] << 26
+	carry[5] = h[5] >> 25
+	h[6] += carry[5]
+	h[5] -= carry[5] << 25
+	carry[6] = h[6] >> 26
+	h[7] += carry[6]
+	h[6] -= carry[6] << 26
+	carry[7] = h[7] >> 25
+	h[8] += carry[7]
+	h[7] -= carry[7] << 25
+	carry[8] = h[8] >> 26
+	h[9] += carry[8]
+	h[8] -= carry[8] << 26
+	carry[9] = h[9] >> 25
+	h[9] -= carry[9] << 25
+	// h10 = carry9
+
+	// Goal: Output h[0]+...+2^255 h10-2^255 q, which is between 0 and 2^255-20.
+	// Have h[0]+...+2^230 h[9] between 0 and 2^255-1;
+	// evidently 2^255 h10-2^255 q = 0.
+	// Goal: Output h[0]+...+2^230 h[9].
+
+	s[0] = byte(h[0] >> 0)
+	s[1] = byte(h[0] >> 8)
+	s[2] = byte(h[0] >> 16)
+	s[3] = byte((h[0] >> 24) | (h[1] << 2))
+	s[4] = byte(h[1] >> 6)
+	s[5] = byte(h[1] >> 14)
+	s[6] = byte((h[1] >> 22) | (h[2] << 3))
+	s[7] = byte(h[2] >> 5)
+	s[8] = byte(h[2] >> 13)
+	s[9] = byte((h[2] >> 21) | (h[3] << 5))
+	s[10] = byte(h[3] >> 3)
+	s[11] = byte(h[3] >> 11)
+	s[12] = byte((h[3] >> 19) | (h[4] << 6))
+	s[13] = byte(h[4] >> 2)
+	s[14] = byte(h[4] >> 10)
+	s[15] = byte(h[4] >> 18)
+	s[16] = byte(h[5] >> 0)
+	s[17] = byte(h[5] >> 8)
+	s[18] = byte(h[5] >> 16)
+	s[19] = byte((h[5] >> 24) | (h[6] << 1))
+	s[20] = byte(h[6] >> 7)
+	s[21] = byte(h[6] >> 15)
+	s[22] = byte((h[6] >> 23) | (h[7] << 3))
+	s[23] = byte(h[7] >> 5)
+	s[24] = byte(h[7] >> 13)
+	s[25] = byte((h[7] >> 21) | (h[8] << 4))
+	s[26] = byte(h[8] >> 4)
+	s[27] = byte(h[8] >> 12)
+	s[28] = byte((h[8] >> 20) | (h[9] << 6))
+	s[29] = byte(h[9] >> 2)
+	s[30] = byte(h[9] >> 10)
+	s[31] = byte(h[9] >> 18)
+}
+
+// feMul calculates h = f * g
+// Can overlap h with f or g.
+//
+// Preconditions:
+//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+//    |g| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+//
+// Postconditions:
+//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+//
+// Notes on implementation strategy:
+//
+// Using schoolbook multiplication.
+// Karatsuba would save a little in some cost models.
+//
+// Most multiplications by 2 and 19 are 32-bit precomputations;
+// cheaper than 64-bit postcomputations.
+//
+// There is one remaining multiplication by 19 in the carry chain;
+// one *19 precomputation can be merged into this,
+// but the resulting data flow is considerably less clean.
+//
+// There are 12 carries below.
+// 10 of them are 2-way parallelizable and vectorizable.
+// Can get away with 11 carries, but then data flow is much deeper.
+//
+// With tighter constraints on inputs can squeeze carries into int32.
+func feMul(h, f, g *fieldElement) {
+	f0 := f[0]
+	f1 := f[1]
+	f2 := f[2]
+	f3 := f[3]
+	f4 := f[4]
+	f5 := f[5]
+	f6 := f[6]
+	f7 := f[7]
+	f8 := f[8]
+	f9 := f[9]
+	g0 := g[0]
+	g1 := g[1]
+	g2 := g[2]
+	g3 := g[3]
+	g4 := g[4]
+	g5 := g[5]
+	g6 := g[6]
+	g7 := g[7]
+	g8 := g[8]
+	g9 := g[9]
+	g1_19 := 19 * g1 // 1.4*2^29
+	g2_19 := 19 * g2 // 1.4*2^30; still ok
+	g3_19 := 19 * g3
+	g4_19 := 19 * g4
+	g5_19 := 19 * g5
+	g6_19 := 19 * g6
+	g7_19 := 19 * g7
+	g8_19 := 19 * g8
+	g9_19 := 19 * g9
+	f1_2 := 2 * f1
+	f3_2 := 2 * f3
+	f5_2 := 2 * f5
+	f7_2 := 2 * f7
+	f9_2 := 2 * f9
+	f0g0 := int64(f0) * int64(g0)
+	f0g1 := int64(f0) * int64(g1)
+	f0g2 := int64(f0) * int64(g2)
+	f0g3 := int64(f0) * int64(g3)
+	f0g4 := int64(f0) * int64(g4)
+	f0g5 := int64(f0) * int64(g5)
+	f0g6 := int64(f0) * int64(g6)
+	f0g7 := int64(f0) * int64(g7)
+	f0g8 := int64(f0) * int64(g8)
+	f0g9 := int64(f0) * int64(g9)
+	f1g0 := int64(f1) * int64(g0)
+	f1g1_2 := int64(f1_2) * int64(g1)
+	f1g2 := int64(f1) * int64(g2)
+	f1g3_2 := int64(f1_2) * int64(g3)
+	f1g4 := int64(f1) * int64(g4)
+	f1g5_2 := int64(f1_2) * int64(g5)
+	f1g6 := int64(f1) * int64(g6)
+	f1g7_2 := int64(f1_2) * int64(g7)
+	f1g8 := int64(f1) * int64(g8)
+	f1g9_38 := int64(f1_2) * int64(g9_19)
+	f2g0 := int64(f2) * int64(g0)
+	f2g1 := int64(f2) * int64(g1)
+	f2g2 := int64(f2) * int64(g2)
+	f2g3 := int64(f2) * int64(g3)
+	f2g4 := int64(f2) * int64(g4)
+	f2g5 := int64(f2) * int64(g5)
+	f2g6 := int64(f2) * int64(g6)
+	f2g7 := int64(f2) * int64(g7)
+	f2g8_19 := int64(f2) * int64(g8_19)
+	f2g9_19 := int64(f2) * int64(g9_19)
+	f3g0 := int64(f3) * int64(g0)
+	f3g1_2 := int64(f3_2) * int64(g1)
+	f3g2 := int64(f3) * int64(g2)
+	f3g3_2 := int64(f3_2) * int64(g3)
+	f3g4 := int64(f3) * int64(g4)
+	f3g5_2 := int64(f3_2) * int64(g5)
+	f3g6 := int64(f3) * int64(g6)
+	f3g7_38 := int64(f3_2) * int64(g7_19)
+	f3g8_19 := int64(f3) * int64(g8_19)
+	f3g9_38 := int64(f3_2) * int64(g9_19)
+	f4g0 := int64(f4) * int64(g0)
+	f4g1 := int64(f4) * int64(g1)
+	f4g2 := int64(f4) * int64(g2)
+	f4g3 := int64(f4) * int64(g3)
+	f4g4 := int64(f4) * int64(g4)
+	f4g5 := int64(f4) * int64(g5)
+	f4g6_19 := int64(f4) * int64(g6_19)
+	f4g7_19 := int64(f4) * int64(g7_19)
+	f4g8_19 := int64(f4) * int64(g8_19)
+	f4g9_19 := int64(f4) * int64(g9_19)
+	f5g0 := int64(f5) * int64(g0)
+	f5g1_2 := int64(f5_2) * int64(g1)
+	f5g2 := int64(f5) * int64(g2)
+	f5g3_2 := int64(f5_2) * int64(g3)
+	f5g4 := int64(f5) * int64(g4)
+	f5g5_38 := int64(f5_2) * int64(g5_19)
+	f5g6_19 := int64(f5) * int64(g6_19)
+	f5g7_38 := int64(f5_2) * int64(g7_19)
+	f5g8_19 := int64(f5) * int64(g8_19)
+	f5g9_38 := int64(f5_2) * int64(g9_19)
+	f6g0 := int64(f6) * int64(g0)
+	f6g1 := int64(f6) * int64(g1)
+	f6g2 := int64(f6) * int64(g2)
+	f6g3 := int64(f6) * int64(g3)
+	f6g4_19 := int64(f6) * int64(g4_19)
+	f6g5_19 := int64(f6) * int64(g5_19)
+	f6g6_19 := int64(f6) * int64(g6_19)
+	f6g7_19 := int64(f6) * int64(g7_19)
+	f6g8_19 := int64(f6) * int64(g8_19)
+	f6g9_19 := int64(f6) * int64(g9_19)
+	f7g0 := int64(f7) * int64(g0)
+	f7g1_2 := int64(f7_2) * int64(g1)
+	f7g2 := int64(f7) * int64(g2)
+	f7g3_38 := int64(f7_2) * int64(g3_19)
+	f7g4_19 := int64(f7) * int64(g4_19)
+	f7g5_38 := int64(f7_2) * int64(g5_19)
+	f7g6_19 := int64(f7) * int64(g6_19)
+	f7g7_38 := int64(f7_2) * int64(g7_19)
+	f7g8_19 := int64(f7) * int64(g8_19)
+	f7g9_38 := int64(f7_2) * int64(g9_19)
+	f8g0 := int64(f8) * int64(g0)
+	f8g1 := int64(f8) * int64(g1)
+	f8g2_19 := int64(f8) * int64(g2_19)
+	f8g3_19 := int64(f8) * int64(g3_19)
+	f8g4_19 := int64(f8) * int64(g4_19)
+	f8g5_19 := int64(f8) * int64(g5_19)
+	f8g6_19 := int64(f8) * int64(g6_19)
+	f8g7_19 := int64(f8) * int64(g7_19)
+	f8g8_19 := int64(f8) * int64(g8_19)
+	f8g9_19 := int64(f8) * int64(g9_19)
+	f9g0 := int64(f9) * int64(g0)
+	f9g1_38 := int64(f9_2) * int64(g1_19)
+	f9g2_19 := int64(f9) * int64(g2_19)
+	f9g3_38 := int64(f9_2) * int64(g3_19)
+	f9g4_19 := int64(f9) * int64(g4_19)
+	f9g5_38 := int64(f9_2) * int64(g5_19)
+	f9g6_19 := int64(f9) * int64(g6_19)
+	f9g7_38 := int64(f9_2) * int64(g7_19)
+	f9g8_19 := int64(f9) * int64(g8_19)
+	f9g9_38 := int64(f9_2) * int64(g9_19)
+	h0 := f0g0 + f1g9_38 + f2g8_19 + f3g7_38 + f4g6_19 + f5g5_38 + f6g4_19 + f7g3_38 + f8g2_19 + f9g1_38
+	h1 := f0g1 + f1g0 + f2g9_19 + f3g8_19 + f4g7_19 + f5g6_19 + f6g5_19 + f7g4_19 + f8g3_19 + f9g2_19
+	h2 := f0g2 + f1g1_2 + f2g0 + f3g9_38 + f4g8_19 + f5g7_38 + f6g6_19 + f7g5_38 + f8g4_19 + f9g3_38
+	h3 := f0g3 + f1g2 + f2g1 + f3g0 + f4g9_19 + f5g8_19 + f6g7_19 + f7g6_19 + f8g5_19 + f9g4_19
+	h4 := f0g4 + f1g3_2 + f2g2 + f3g1_2 + f4g0 + f5g9_38 + f6g8_19 + f7g7_38 + f8g6_19 + f9g5_38
+	h5 := f0g5 + f1g4 + f2g3 + f3g2 + f4g1 + f5g0 + f6g9_19 + f7g8_19 + f8g7_19 + f9g6_19
+	h6 := f0g6 + f1g5_2 + f2g4 + f3g3_2 + f4g2 + f5g1_2 + f6g0 + f7g9_38 + f8g8_19 + f9g7_38
+	h7 := f0g7 + f1g6 + f2g5 + f3g4 + f4g3 + f5g2 + f6g1 + f7g0 + f8g9_19 + f9g8_19
+	h8 := f0g8 + f1g7_2 + f2g6 + f3g5_2 + f4g4 + f5g3_2 + f6g2 + f7g1_2 + f8g0 + f9g9_38
+	h9 := f0g9 + f1g8 + f2g7 + f3g6 + f4g5 + f5g4 + f6g3 + f7g2 + f8g1 + f9g0
+	var carry [10]int64
+
+	// |h0| <= (1.1*1.1*2^52*(1+19+19+19+19)+1.1*1.1*2^50*(38+38+38+38+38))
+	//   i.e. |h0| <= 1.2*2^59; narrower ranges for h2, h4, h6, h8
+	// |h1| <= (1.1*1.1*2^51*(1+1+19+19+19+19+19+19+19+19))
+	//   i.e. |h1| <= 1.5*2^58; narrower ranges for h3, h5, h7, h9
+
+	carry[0] = (h0 + (1 << 25)) >> 26
+	h1 += carry[0]
+	h0 -= carry[0] << 26
+	carry[4] = (h4 + (1 << 25)) >> 26
+	h5 += carry[4]
+	h4 -= carry[4] << 26
+	// |h0| <= 2^25
+	// |h4| <= 2^25
+	// |h1| <= 1.51*2^58
+	// |h5| <= 1.51*2^58
+
+	carry[1] = (h1 + (1 << 24)) >> 25
+	h2 += carry[1]
+	h1 -= carry[1] << 25
+	carry[5] = (h5 + (1 << 24)) >> 25
+	h6 += carry[5]
+	h5 -= carry[5] << 25
+	// |h1| <= 2^24; from now on fits into int32
+	// |h5| <= 2^24; from now on fits into int32
+	// |h2| <= 1.21*2^59
+	// |h6| <= 1.21*2^59
+
+	carry[2] = (h2 + (1 << 25)) >> 26
+	h3 += carry[2]
+	h2 -= carry[2] << 26
+	carry[6] = (h6 + (1 << 25)) >> 26
+	h7 += carry[6]
+	h6 -= carry[6] << 26
+	// |h2| <= 2^25; from now on fits into int32 unchanged
+	// |h6| <= 2^25; from now on fits into int32 unchanged
+	// |h3| <= 1.51*2^58
+	// |h7| <= 1.51*2^58
+
+	carry[3] = (h3 + (1 << 24)) >> 25
+	h4 += carry[3]
+	h3 -= carry[3] << 25
+	carry[7] = (h7 + (1 << 24)) >> 25
+	h8 += carry[7]
+	h7 -= carry[7] << 25
+	// |h3| <= 2^24; from now on fits into int32 unchanged
+	// |h7| <= 2^24; from now on fits into int32 unchanged
+	// |h4| <= 1.52*2^33
+	// |h8| <= 1.52*2^33
+
+	carry[4] = (h4 + (1 << 25)) >> 26
+	h5 += carry[4]
+	h4 -= carry[4] << 26
+	carry[8] = (h8 + (1 << 25)) >> 26
+	h9 += carry[8]
+	h8 -= carry[8] << 26
+	// |h4| <= 2^25; from now on fits into int32 unchanged
+	// |h8| <= 2^25; from now on fits into int32 unchanged
+	// |h5| <= 1.01*2^24
+	// |h9| <= 1.51*2^58
+
+	carry[9] = (h9 + (1 << 24)) >> 25
+	h0 += carry[9] * 19
+	h9 -= carry[9] << 25
+	// |h9| <= 2^24; from now on fits into int32 unchanged
+	// |h0| <= 1.8*2^37
+
+	carry[0] = (h0 + (1 << 25)) >> 26
+	h1 += carry[0]
+	h0 -= carry[0] << 26
+	// |h0| <= 2^25; from now on fits into int32 unchanged
+	// |h1| <= 1.01*2^24
+
+	h[0] = int32(h0)
+	h[1] = int32(h1)
+	h[2] = int32(h2)
+	h[3] = int32(h3)
+	h[4] = int32(h4)
+	h[5] = int32(h5)
+	h[6] = int32(h6)
+	h[7] = int32(h7)
+	h[8] = int32(h8)
+	h[9] = int32(h9)
+}
+
+// feSquare calculates h = f*f. Can overlap h with f.
+//
+// Preconditions:
+//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+//
+// Postconditions:
+//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+func feSquare(h, f *fieldElement) {
+	f0 := f[0]
+	f1 := f[1]
+	f2 := f[2]
+	f3 := f[3]
+	f4 := f[4]
+	f5 := f[5]
+	f6 := f[6]
+	f7 := f[7]
+	f8 := f[8]
+	f9 := f[9]
+	f0_2 := 2 * f0
+	f1_2 := 2 * f1
+	f2_2 := 2 * f2
+	f3_2 := 2 * f3
+	f4_2 := 2 * f4
+	f5_2 := 2 * f5
+	f6_2 := 2 * f6
+	f7_2 := 2 * f7
+	f5_38 := 38 * f5 // 1.31*2^30
+	f6_19 := 19 * f6 // 1.31*2^30
+	f7_38 := 38 * f7 // 1.31*2^30
+	f8_19 := 19 * f8 // 1.31*2^30
+	f9_38 := 38 * f9 // 1.31*2^30
+	f0f0 := int64(f0) * int64(f0)
+	f0f1_2 := int64(f0_2) * int64(f1)
+	f0f2_2 := int64(f0_2) * int64(f2)
+	f0f3_2 := int64(f0_2) * int64(f3)
+	f0f4_2 := int64(f0_2) * int64(f4)
+	f0f5_2 := int64(f0_2) * int64(f5)
+	f0f6_2 := int64(f0_2) * int64(f6)
+	f0f7_2 := int64(f0_2) * int64(f7)
+	f0f8_2 := int64(f0_2) * int64(f8)
+	f0f9_2 := int64(f0_2) * int64(f9)
+	f1f1_2 := int64(f1_2) * int64(f1)
+	f1f2_2 := int64(f1_2) * int64(f2)
+	f1f3_4 := int64(f1_2) * int64(f3_2)
+	f1f4_2 := int64(f1_2) * int64(f4)
+	f1f5_4 := int64(f1_2) * int64(f5_2)
+	f1f6_2 := int64(f1_2) * int64(f6)
+	f1f7_4 := int64(f1_2) * int64(f7_2)
+	f1f8_2 := int64(f1_2) * int64(f8)
+	f1f9_76 := int64(f1_2) * int64(f9_38)
+	f2f2 := int64(f2) * int64(f2)
+	f2f3_2 := int64(f2_2) * int64(f3)
+	f2f4_2 := int64(f2_2) * int64(f4)
+	f2f5_2 := int64(f2_2) * int64(f5)
+	f2f6_2 := int64(f2_2) * int64(f6)
+	f2f7_2 := int64(f2_2) * int64(f7)
+	f2f8_38 := int64(f2_2) * int64(f8_19)
+	f2f9_38 := int64(f2) * int64(f9_38)
+	f3f3_2 := int64(f3_2) * int64(f3)
+	f3f4_2 := int64(f3_2) * int64(f4)
+	f3f5_4 := int64(f3_2) * int64(f5_2)
+	f3f6_2 := int64(f3_2) * int64(f6)
+	f3f7_76 := int64(f3_2) * int64(f7_38)
+	f3f8_38 := int64(f3_2) * int64(f8_19)
+	f3f9_76 := int64(f3_2) * int64(f9_38)
+	f4f4 := int64(f4) * int64(f4)
+	f4f5_2 := int64(f4_2) * int64(f5)
+	f4f6_38 := int64(f4_2) * int64(f6_19)
+	f4f7_38 := int64(f4) * int64(f7_38)
+	f4f8_38 := int64(f4_2) * int64(f8_19)
+	f4f9_38 := int64(f4) * int64(f9_38)
+	f5f5_38 := int64(f5) * int64(f5_38)
+	f5f6_38 := int64(f5_2) * int64(f6_19)
+	f5f7_76 := int64(f5_2) * int64(f7_38)
+	f5f8_38 := int64(f5_2) * int64(f8_19)
+	f5f9_76 := int64(f5_2) * int64(f9_38)
+	f6f6_19 := int64(f6) * int64(f6_19)
+	f6f7_38 := int64(f6) * int64(f7_38)
+	f6f8_38 := int64(f6_2) * int64(f8_19)
+	f6f9_38 := int64(f6) * int64(f9_38)
+	f7f7_38 := int64(f7) * int64(f7_38)
+	f7f8_38 := int64(f7_2) * int64(f8_19)
+	f7f9_76 := int64(f7_2) * int64(f9_38)
+	f8f8_19 := int64(f8) * int64(f8_19)
+	f8f9_38 := int64(f8) * int64(f9_38)
+	f9f9_38 := int64(f9) * int64(f9_38)
+	h0 := f0f0 + f1f9_76 + f2f8_38 + f3f7_76 + f4f6_38 + f5f5_38
+	h1 := f0f1_2 + f2f9_38 + f3f8_38 + f4f7_38 + f5f6_38
+	h2 := f0f2_2 + f1f1_2 + f3f9_76 + f4f8_38 + f5f7_76 + f6f6_19
+	h3 := f0f3_2 + f1f2_2 + f4f9_38 + f5f8_38 + f6f7_38
+	h4 := f0f4_2 + f1f3_4 + f2f2 + f5f9_76 + f6f8_38 + f7f7_38
+	h5 := f0f5_2 + f1f4_2 + f2f3_2 + f6f9_38 + f7f8_38
+	h6 := f0f6_2 + f1f5_4 + f2f4_2 + f3f3_2 + f7f9_76 + f8f8_19
+	h7 := f0f7_2 + f1f6_2 + f2f5_2 + f3f4_2 + f8f9_38
+	h8 := f0f8_2 + f1f7_4 + f2f6_2 + f3f5_4 + f4f4 + f9f9_38
+	h9 := f0f9_2 + f1f8_2 + f2f7_2 + f3f6_2 + f4f5_2
+	var carry [10]int64
+
+	carry[0] = (h0 + (1 << 25)) >> 26
+	h1 += carry[0]
+	h0 -= carry[0] << 26
+	carry[4] = (h4 + (1 << 25)) >> 26
+	h5 += carry[4]
+	h4 -= carry[4] << 26
+
+	carry[1] = (h1 + (1 << 24)) >> 25
+	h2 += carry[1]
+	h1 -= carry[1] << 25
+	carry[5] = (h5 + (1 << 24)) >> 25
+	h6 += carry[5]
+	h5 -= carry[5] << 25
+
+	carry[2] = (h2 + (1 << 25)) >> 26
+	h3 += carry[2]
+	h2 -= carry[2] << 26
+	carry[6] = (h6 + (1 << 25)) >> 26
+	h7 += carry[6]
+	h6 -= carry[6] << 26
+
+	carry[3] = (h3 + (1 << 24)) >> 25
+	h4 += carry[3]
+	h3 -= carry[3] << 25
+	carry[7] = (h7 + (1 << 24)) >> 25
+	h8 += carry[7]
+	h7 -= carry[7] << 25
+
+	carry[4] = (h4 + (1 << 25)) >> 26
+	h5 += carry[4]
+	h4 -= carry[4] << 26
+	carry[8] = (h8 + (1 << 25)) >> 26
+	h9 += carry[8]
+	h8 -= carry[8] << 26
+
+	carry[9] = (h9 + (1 << 24)) >> 25
+	h0 += carry[9] * 19
+	h9 -= carry[9] << 25
+
+	carry[0] = (h0 + (1 << 25)) >> 26
+	h1 += carry[0]
+	h0 -= carry[0] << 26
+
+	h[0] = int32(h0)
+	h[1] = int32(h1)
+	h[2] = int32(h2)
+	h[3] = int32(h3)
+	h[4] = int32(h4)
+	h[5] = int32(h5)
+	h[6] = int32(h6)
+	h[7] = int32(h7)
+	h[8] = int32(h8)
+	h[9] = int32(h9)
+}
+
+// feMul121666 calculates h = f * 121666. Can overlap h with f.
+//
+// Preconditions:
+//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+//
+// Postconditions:
+//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+func feMul121666(h, f *fieldElement) {
+	h0 := int64(f[0]) * 121666
+	h1 := int64(f[1]) * 121666
+	h2 := int64(f[2]) * 121666
+	h3 := int64(f[3]) * 121666
+	h4 := int64(f[4]) * 121666
+	h5 := int64(f[5]) * 121666
+	h6 := int64(f[6]) * 121666
+	h7 := int64(f[7]) * 121666
+	h8 := int64(f[8]) * 121666
+	h9 := int64(f[9]) * 121666
+	var carry [10]int64
+
+	carry[9] = (h9 + (1 << 24)) >> 25
+	h0 += carry[9] * 19
+	h9 -= carry[9] << 25
+	carry[1] = (h1 + (1 << 24)) >> 25
+	h2 += carry[1]
+	h1 -= carry[1] << 25
+	carry[3] = (h3 + (1 << 24)) >> 25
+	h4 += carry[3]
+	h3 -= carry[3] << 25
+	carry[5] = (h5 + (1 << 24)) >> 25
+	h6 += carry[5]
+	h5 -= carry[5] << 25
+	carry[7] = (h7 + (1 << 24)) >> 25
+	h8 += carry[7]
+	h7 -= carry[7] << 25
+
+	carry[0] = (h0 + (1 << 25)) >> 26
+	h1 += carry[0]
+	h0 -= carry[0] << 26
+	carry[2] = (h2 + (1 << 25)) >> 26
+	h3 += carry[2]
+	h2 -= carry[2] << 26
+	carry[4] = (h4 + (1 << 25)) >> 26
+	h5 += carry[4]
+	h4 -= carry[4] << 26
+	carry[6] = (h6 + (1 << 25)) >> 26
+	h7 += carry[6]
+	h6 -= carry[6] << 26
+	carry[8] = (h8 + (1 << 25)) >> 26
+	h9 += carry[8]
+	h8 -= carry[8] << 26
+
+	h[0] = int32(h0)
+	h[1] = int32(h1)
+	h[2] = int32(h2)
+	h[3] = int32(h3)
+	h[4] = int32(h4)
+	h[5] = int32(h5)
+	h[6] = int32(h6)
+	h[7] = int32(h7)
+	h[8] = int32(h8)
+	h[9] = int32(h9)
+}
+
+// feInvert sets out = z^-1.
+func feInvert(out, z *fieldElement) {
+	var t0, t1, t2, t3 fieldElement
+	var i int
+
+	feSquare(&t0, z)
+	for i = 1; i < 1; i++ {
+		feSquare(&t0, &t0)
+	}
+	feSquare(&t1, &t0)
+	for i = 1; i < 2; i++ {
+		feSquare(&t1, &t1)
+	}
+	feMul(&t1, z, &t1)
+	feMul(&t0, &t0, &t1)
+	feSquare(&t2, &t0)
+	for i = 1; i < 1; i++ {
+		feSquare(&t2, &t2)
+	}
+	feMul(&t1, &t1, &t2)
+	feSquare(&t2, &t1)
+	for i = 1; i < 5; i++ {
+		feSquare(&t2, &t2)
+	}
+	feMul(&t1, &t2, &t1)
+	feSquare(&t2, &t1)
+	for i = 1; i < 10; i++ {
+		feSquare(&t2, &t2)
+	}
+	feMul(&t2, &t2, &t1)
+	feSquare(&t3, &t2)
+	for i = 1; i < 20; i++ {
+		feSquare(&t3, &t3)
+	}
+	feMul(&t2, &t3, &t2)
+	feSquare(&t2, &t2)
+	for i = 1; i < 10; i++ {
+		feSquare(&t2, &t2)
+	}
+	feMul(&t1, &t2, &t1)
+	feSquare(&t2, &t1)
+	for i = 1; i < 50; i++ {
+		feSquare(&t2, &t2)
+	}
+	feMul(&t2, &t2, &t1)
+	feSquare(&t3, &t2)
+	for i = 1; i < 100; i++ {
+		feSquare(&t3, &t3)
+	}
+	feMul(&t2, &t3, &t2)
+	feSquare(&t2, &t2)
+	for i = 1; i < 50; i++ {
+		feSquare(&t2, &t2)
+	}
+	feMul(&t1, &t2, &t1)
+	feSquare(&t1, &t1)
+	for i = 1; i < 5; i++ {
+		feSquare(&t1, &t1)
+	}
+	feMul(out, &t1, &t0)
+}
+
+func scalarMult(out, in, base *[32]byte) {
+	var e [32]byte
+
+	copy(e[:], in[:])
+	e[0] &= 248
+	e[31] &= 127
+	e[31] |= 64
+
+	var x1, x2, z2, x3, z3, tmp0, tmp1 fieldElement
+	feFromBytes(&x1, base)
+	feOne(&x2)
+	feCopy(&x3, &x1)
+	feOne(&z3)
+
+	swap := int32(0)
+	for pos := 254; pos >= 0; pos-- {
+		b := e[pos/8] >> uint(pos&7)
+		b &= 1
+		swap ^= int32(b)
+		feCSwap(&x2, &x3, swap)
+		feCSwap(&z2, &z3, swap)
+		swap = int32(b)
+
+		feSub(&tmp0, &x3, &z3)
+		feSub(&tmp1, &x2, &z2)
+		feAdd(&x2, &x2, &z2)
+		feAdd(&z2, &x3, &z3)
+		feMul(&z3, &tmp0, &x2)
+		feMul(&z2, &z2, &tmp1)
+		feSquare(&tmp0, &tmp1)
+		feSquare(&tmp1, &x2)
+		feAdd(&x3, &z3, &z2)
+		feSub(&z2, &z3, &z2)
+		feMul(&x2, &tmp1, &tmp0)
+		feSub(&tmp1, &tmp1, &tmp0)
+		feSquare(&z2, &z2)
+		feMul121666(&z3, &tmp1)
+		feSquare(&x3, &x3)
+		feAdd(&tmp0, &tmp0, &z3)
+		feMul(&z3, &x1, &z2)
+		feMul(&z2, &tmp1, &tmp0)
+	}
+
+	feCSwap(&x2, &x3, swap)
+	feCSwap(&z2, &z3, swap)
+
+	feInvert(&z2, &z2)
+	feMul(&x2, &x2, &z2)
+	feToBytes(out, &x2)
+}

vendor/golang.org/x/crypto/curve25519/doc.go

@@ -4,7 +4,7 @@
 
 // Package curve25519 provides an implementation of scalar multiplication on
 // the elliptic curve known as curve25519. See http://cr.yp.to/ecdh.html
-package curve25519 // import "golang.org/x/crypto/curve25519"
+package curve25519
 
 // basePoint is the x coordinate of the generator of the curve.
 var basePoint = [32]byte{9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}

vendor/golang.org/x/crypto/curve25519/freeze_amd64.s

@@ -8,9 +8,22 @@
 // +build amd64,!gccgo,!appengine
 
 // func freeze(inout *[5]uint64)
-TEXT ·freeze(SB),7,$0-8
+TEXT ·freeze(SB),7,$96-8
 	MOVQ inout+0(FP), DI
 
+	MOVQ SP,R11
+	MOVQ $31,CX
+	NOTQ CX
+	ANDQ CX,SP
+	ADDQ $32,SP
+
+	MOVQ R11,0(SP)
+	MOVQ R12,8(SP)
+	MOVQ R13,16(SP)
+	MOVQ R14,24(SP)
+	MOVQ R15,32(SP)
+	MOVQ BX,40(SP)
+	MOVQ BP,48(SP)
 	MOVQ 0(DI),SI
 	MOVQ 8(DI),DX
 	MOVQ 16(DI),CX
@@ -68,4 +81,14 @@ REDUCELOOP:
 	MOVQ CX,16(DI)
 	MOVQ R8,24(DI)
 	MOVQ R9,32(DI)
+	MOVQ 0(SP),R11
+	MOVQ 8(SP),R12
+	MOVQ 16(SP),R13
+	MOVQ 24(SP),R14
+	MOVQ 32(SP),R15
+	MOVQ 40(SP),BX
+	MOVQ 48(SP),BP
+	MOVQ R11,SP
+	MOVQ DI,AX
+	MOVQ SI,DX
 	RET

vendor/golang.org/x/crypto/curve25519/mul_amd64.s

@@ -8,21 +8,35 @@
 // +build amd64,!gccgo,!appengine
 
 // func mul(dest, a, b *[5]uint64)
-TEXT ·mul(SB),0,$16-24
+TEXT ·mul(SB),0,$128-24
 	MOVQ dest+0(FP), DI
 	MOVQ a+8(FP), SI
 	MOVQ b+16(FP), DX
 
+	MOVQ SP,R11
+	MOVQ $31,CX
+	NOTQ CX
+	ANDQ CX,SP
+	ADDQ $32,SP
+
+	MOVQ R11,0(SP)
+	MOVQ R12,8(SP)
+	MOVQ R13,16(SP)
+	MOVQ R14,24(SP)
+	MOVQ R15,32(SP)
+	MOVQ BX,40(SP)
+	MOVQ BP,48(SP)
+	MOVQ DI,56(SP)
 	MOVQ DX,CX
 	MOVQ 24(SI),DX
 	IMUL3Q $19,DX,AX
-	MOVQ AX,0(SP)
+	MOVQ AX,64(SP)
 	MULQ 16(CX)
 	MOVQ AX,R8
 	MOVQ DX,R9
 	MOVQ 32(SI),DX
 	IMUL3Q $19,DX,AX
-	MOVQ AX,8(SP)
+	MOVQ AX,72(SP)
 	MULQ 8(CX)
 	ADDQ AX,R8
 	ADCQ DX,R9
@@ -97,11 +111,11 @@ TEXT ·mul(SB),0,$16-24
 	MULQ 8(CX)
 	ADDQ AX,BX
 	ADCQ DX,BP
-	MOVQ 0(SP),AX
+	MOVQ 64(SP),AX
 	MULQ 24(CX)
 	ADDQ AX,R10
 	ADCQ DX,R11
-	MOVQ 0(SP),AX
+	MOVQ 64(SP),AX
 	MULQ 32(CX)
 	ADDQ AX,R12
 	ADCQ DX,R13
@@ -109,15 +123,15 @@ TEXT ·mul(SB),0,$16-24
 	MULQ 0(CX)
 	ADDQ AX,BX
 	ADCQ DX,BP
-	MOVQ 8(SP),AX
+	MOVQ 72(SP),AX
 	MULQ 16(CX)
 	ADDQ AX,R10
 	ADCQ DX,R11
-	MOVQ 8(SP),AX
+	MOVQ 72(SP),AX
 	MULQ 24(CX)
 	ADDQ AX,R12
 	ADCQ DX,R13
-	MOVQ 8(SP),AX
+	MOVQ 72(SP),AX
 	MULQ 32(CX)
 	ADDQ AX,R14
 	ADCQ DX,R15
@@ -164,4 +178,14 @@ TEXT ·mul(SB),0,$16-24
 	MOVQ R9,16(DI)
 	MOVQ AX,24(DI)
 	MOVQ R10,32(DI)
+	MOVQ 0(SP),R11
+	MOVQ 8(SP),R12
+	MOVQ 16(SP),R13
+	MOVQ 24(SP),R14
+	MOVQ 32(SP),R15
+	MOVQ 40(SP),BX
+	MOVQ 48(SP),BP
+	MOVQ R11,SP
+	MOVQ DI,AX
+	MOVQ SI,DX
 	RET

vendor/golang.org/x/crypto/curve25519/square_amd64.s

@@ -8,10 +8,23 @@
 // +build amd64,!gccgo,!appengine
 
 // func square(out, in *[5]uint64)
-TEXT ·square(SB),7,$0-16
+TEXT ·square(SB),7,$96-16
 	MOVQ out+0(FP), DI
 	MOVQ in+8(FP), SI
 
+	MOVQ SP,R11
+	MOVQ $31,CX
+	NOTQ CX
+	ANDQ CX,SP
+	ADDQ $32, SP
+
+	MOVQ R11,0(SP)
+	MOVQ R12,8(SP)
+	MOVQ R13,16(SP)
+	MOVQ R14,24(SP)
+	MOVQ R15,32(SP)
+	MOVQ BX,40(SP)
+	MOVQ BP,48(SP)
 	MOVQ 0(SI),AX
 	MULQ 0(SI)
 	MOVQ AX,CX
@@ -127,4 +140,14 @@ TEXT ·square(SB),7,$0-16
 	MOVQ R9,16(DI)
 	MOVQ AX,24(DI)
 	MOVQ R10,32(DI)
+	MOVQ 0(SP),R11
+	MOVQ 8(SP),R12
+	MOVQ 16(SP),R13
+	MOVQ 24(SP),R14
+	MOVQ 32(SP),R15
+	MOVQ 40(SP),BX
+	MOVQ 48(SP),BP
+	MOVQ R11,SP
+	MOVQ DI,AX
+	MOVQ SI,DX
 	RET

vendor/golang.org/x/crypto/ed25519/ed25519.go

@@ -1,181 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package ed25519 implements the Ed25519 signature algorithm. See
-// http://ed25519.cr.yp.to/.
-//
-// These functions are also compatible with the “Ed25519” function defined in
-// https://tools.ietf.org/html/draft-irtf-cfrg-eddsa-05.
-package ed25519
-
-// This code is a port of the public domain, “ref10” implementation of ed25519
-// from SUPERCOP.
-
-import (
-	"crypto"
-	cryptorand "crypto/rand"
-	"crypto/sha512"
-	"crypto/subtle"
-	"errors"
-	"io"
-	"strconv"
-
-	"golang.org/x/crypto/ed25519/internal/edwards25519"
-)
-
-const (
-	// PublicKeySize is the size, in bytes, of public keys as used in this package.
-	PublicKeySize = 32
-	// PrivateKeySize is the size, in bytes, of private keys as used in this package.
-	PrivateKeySize = 64
-	// SignatureSize is the size, in bytes, of signatures generated and verified by this package.
-	SignatureSize = 64
-)
-
-// PublicKey is the type of Ed25519 public keys.
-type PublicKey []byte
-
-// PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer.
-type PrivateKey []byte
-
-// Public returns the PublicKey corresponding to priv.
-func (priv PrivateKey) Public() crypto.PublicKey {
-	publicKey := make([]byte, PublicKeySize)
-	copy(publicKey, priv[32:])
-	return PublicKey(publicKey)
-}
-
-// Sign signs the given message with priv.
-// Ed25519 performs two passes over messages to be signed and therefore cannot
-// handle pre-hashed messages. Thus opts.HashFunc() must return zero to
-// indicate the message hasn't been hashed. This can be achieved by passing
-// crypto.Hash(0) as the value for opts.
-func (priv PrivateKey) Sign(rand io.Reader, message []byte, opts crypto.SignerOpts) (signature []byte, err error) {
-	if opts.HashFunc() != crypto.Hash(0) {
-		return nil, errors.New("ed25519: cannot sign hashed message")
-	}
-
-	return Sign(priv, message), nil
-}
-
-// GenerateKey generates a public/private key pair using entropy from rand.
-// If rand is nil, crypto/rand.Reader will be used.
-func GenerateKey(rand io.Reader) (publicKey PublicKey, privateKey PrivateKey, err error) {
-	if rand == nil {
-		rand = cryptorand.Reader
-	}
-
-	privateKey = make([]byte, PrivateKeySize)
-	publicKey = make([]byte, PublicKeySize)
-	_, err = io.ReadFull(rand, privateKey[:32])
-	if err != nil {
-		return nil, nil, err
-	}
-
-	digest := sha512.Sum512(privateKey[:32])
-	digest[0] &= 248
-	digest[31] &= 127
-	digest[31] |= 64
-
-	var A edwards25519.ExtendedGroupElement
-	var hBytes [32]byte
-	copy(hBytes[:], digest[:])
-	edwards25519.GeScalarMultBase(&A, &hBytes)
-	var publicKeyBytes [32]byte
-	A.ToBytes(&publicKeyBytes)
-
-	copy(privateKey[32:], publicKeyBytes[:])
-	copy(publicKey, publicKeyBytes[:])
-
-	return publicKey, privateKey, nil
-}
-
-// Sign signs the message with privateKey and returns a signature. It will
-// panic if len(privateKey) is not PrivateKeySize.
-func Sign(privateKey PrivateKey, message []byte) []byte {
-	if l := len(privateKey); l != PrivateKeySize {
-		panic("ed25519: bad private key length: " + strconv.Itoa(l))
-	}
-
-	h := sha512.New()
-	h.Write(privateKey[:32])
-
-	var digest1, messageDigest, hramDigest [64]byte
-	var expandedSecretKey [32]byte
-	h.Sum(digest1[:0])
-	copy(expandedSecretKey[:], digest1[:])
-	expandedSecretKey[0] &= 248
-	expandedSecretKey[31] &= 63
-	expandedSecretKey[31] |= 64
-
-	h.Reset()
-	h.Write(digest1[32:])
-	h.Write(message)
-	h.Sum(messageDigest[:0])
-
-	var messageDigestReduced [32]byte
-	edwards25519.ScReduce(&messageDigestReduced, &messageDigest)
-	var R edwards25519.ExtendedGroupElement
-	edwards25519.GeScalarMultBase(&R, &messageDigestReduced)
-
-	var encodedR [32]byte
-	R.ToBytes(&encodedR)
-
-	h.Reset()
-	h.Write(encodedR[:])
-	h.Write(privateKey[32:])
-	h.Write(message)
-	h.Sum(hramDigest[:0])
-	var hramDigestReduced [32]byte
-	edwards25519.ScReduce(&hramDigestReduced, &hramDigest)
-
-	var s [32]byte
-	edwards25519.ScMulAdd(&s, &hramDigestReduced, &expandedSecretKey, &messageDigestReduced)
-
-	signature := make([]byte, SignatureSize)
-	copy(signature[:], encodedR[:])
-	copy(signature[32:], s[:])
-
-	return signature
-}
-
-// Verify reports whether sig is a valid signature of message by publicKey. It
-// will panic if len(publicKey) is not PublicKeySize.
-func Verify(publicKey PublicKey, message, sig []byte) bool {
-	if l := len(publicKey); l != PublicKeySize {
-		panic("ed25519: bad public key length: " + strconv.Itoa(l))
-	}
-
-	if len(sig) != SignatureSize || sig[63]&224 != 0 {
-		return false
-	}
-
-	var A edwards25519.ExtendedGroupElement
-	var publicKeyBytes [32]byte
-	copy(publicKeyBytes[:], publicKey)
-	if !A.FromBytes(&publicKeyBytes) {
-		return false
-	}
-	edwards25519.FeNeg(&A.X, &A.X)
-	edwards25519.FeNeg(&A.T, &A.T)
-
-	h := sha512.New()
-	h.Write(sig[:32])
-	h.Write(publicKey[:])
-	h.Write(message)
-	var digest [64]byte
-	h.Sum(digest[:0])
-
-	var hReduced [32]byte
-	edwards25519.ScReduce(&hReduced, &digest)
-
-	var R edwards25519.ProjectiveGroupElement
-	var b [32]byte
-	copy(b[:], sig[32:])
-	edwards25519.GeDoubleScalarMultVartime(&R, &hReduced, &A, &b)
-
-	var checkR [32]byte
-	R.ToBytes(&checkR)
-	return subtle.ConstantTimeCompare(sig[:32], checkR[:]) == 1
-}

vendor/golang.org/x/crypto/ssh/agent/client.go

@@ -2,14 +2,13 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package agent implements the ssh-agent protocol, and provides both
-// a client and a server. The client can talk to a standard ssh-agent
-// that uses UNIX sockets, and one could implement an alternative
-// ssh-agent process using the sample server.
-//
-// References:
-//  [PROTOCOL.agent]:    http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL.agent?rev=HEAD
-package agent // import "golang.org/x/crypto/ssh/agent"
+/*
+  Package agent implements a client to an ssh-agent daemon.
+
+References:
+  [PROTOCOL.agent]:    http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL.agent?rev=HEAD
+*/
+package agent
 
 import (
 	"bytes"
@@ -25,7 +24,6 @@ import (
 	"math/big"
 	"sync"
 
-	"golang.org/x/crypto/ed25519"
 	"golang.org/x/crypto/ssh"
 )
 
@@ -77,8 +75,7 @@ type AddedKey struct {
 
 // See [PROTOCOL.agent], section 3.
 const (
-	agentRequestV1Identities   = 1
-	agentRemoveAllV1Identities = 9
+	agentRequestV1Identities = 1
 
 	// 3.2 Requests from client to agent for protocol 2 key operations
 	agentAddIdentity         = 17
@@ -185,13 +182,10 @@ func (k *Key) Marshal() []byte {
 	return k.Blob
 }
 
-// Verify satisfies the ssh.PublicKey interface.
+// Verify satisfies the ssh.PublicKey interface, but is not
+// implemented for agent keys.
 func (k *Key) Verify(data []byte, sig *ssh.Signature) error {
-	pubKey, err := ssh.ParsePublicKey(k.Blob)
-	if err != nil {
-		return fmt.Errorf("agent: bad public key: %v", err)
-	}
-	return pubKey.Verify(data, sig)
+	return errors.New("agent: agent key does not know how to verify")
 }
 
 type wireKey struct {
@@ -381,8 +375,6 @@ func unmarshal(packet []byte) (interface{}, error) {
 		msg = new(identitiesAnswerAgentMsg)
 	case agentSignResponse:
 		msg = new(signResponseAgentMsg)
-	case agentV1IdentitiesAnswer:
-		msg = new(agentV1IdentityMsg)
 	default:
 		return nil, fmt.Errorf("agent: unknown type tag %d", packet[0])
 	}
@@ -393,7 +385,7 @@ func unmarshal(packet []byte) (interface{}, error) {
 }
 
 type rsaKeyMsg struct {
-	Type        string `sshtype:"17|25"`
+	Type        string `sshtype:"17"`
 	N           *big.Int
 	E           *big.Int
 	D           *big.Int
@@ -405,7 +397,7 @@ type rsaKeyMsg struct {
 }
 
 type dsaKeyMsg struct {
-	Type        string `sshtype:"17|25"`
+	Type        string `sshtype:"17"`
 	P           *big.Int
 	Q           *big.Int
 	G           *big.Int
@@ -416,7 +408,7 @@ type dsaKeyMsg struct {
 }
 
 type ecdsaKeyMsg struct {
-	Type        string `sshtype:"17|25"`
+	Type        string `sshtype:"17"`
 	Curve       string
 	KeyBytes    []byte
 	D           *big.Int
@@ -424,14 +416,6 @@ type ecdsaKeyMsg struct {
 	Constraints []byte `ssh:"rest"`
 }
 
-type ed25519KeyMsg struct {
-	Type        string `sshtype:"17|25"`
-	Pub         []byte
-	Priv        []byte
-	Comments    string
-	Constraints []byte `ssh:"rest"`
-}
-
 // Insert adds a private key to the agent.
 func (c *client) insertKey(s interface{}, comment string, constraints []byte) error {
 	var req []byte
@@ -473,14 +457,6 @@ func (c *client) insertKey(s interface{}, comment string, constraints []byte) er
 			Comments:    comment,
 			Constraints: constraints,
 		})
-	case *ed25519.PrivateKey:
-		req = ssh.Marshal(ed25519KeyMsg{
-			Type:        ssh.KeyAlgoED25519,
-			Pub:         []byte(*k)[32:],
-			Priv:        []byte(*k),
-			Comments:    comment,
-			Constraints: constraints,
-		})
 	default:
 		return fmt.Errorf("agent: unsupported key type %T", s)
 	}
@@ -501,7 +477,7 @@ func (c *client) insertKey(s interface{}, comment string, constraints []byte) er
 }
 
 type rsaCertMsg struct {
-	Type        string `sshtype:"17|25"`
+	Type        string `sshtype:"17"`
 	CertBytes   []byte
 	D           *big.Int
 	Iqmp        *big.Int // IQMP = Inverse Q Mod P
@@ -512,7 +488,7 @@ type rsaCertMsg struct {
 }
 
 type dsaCertMsg struct {
-	Type        string `sshtype:"17|25"`
+	Type        string `sshtype:"17"`
 	CertBytes   []byte
 	X           *big.Int
 	Comments    string
@@ -520,23 +496,14 @@ type dsaCertMsg struct {
 }
 
 type ecdsaCertMsg struct {
-	Type        string `sshtype:"17|25"`
+	Type        string `sshtype:"17"`
 	CertBytes   []byte
 	D           *big.Int
 	Comments    string
 	Constraints []byte `ssh:"rest"`
 }
 
-type ed25519CertMsg struct {
-	Type        string `sshtype:"17|25"`
-	CertBytes   []byte
-	Pub         []byte
-	Priv        []byte
-	Comments    string
-	Constraints []byte `ssh:"rest"`
-}
-
-// Add adds a private key to the agent. If a certificate is given,
+// Insert adds a private key to the agent. If a certificate is given,
 // that certificate is added instead as public key.
 func (c *client) Add(key AddedKey) error {
 	var constraints []byte
@@ -580,28 +547,17 @@ func (c *client) insertCert(s interface{}, cert *ssh.Certificate, comment string
 		})
 	case *dsa.PrivateKey:
 		req = ssh.Marshal(dsaCertMsg{
-			Type:        cert.Type(),
-			CertBytes:   cert.Marshal(),
-			X:           k.X,
-			Comments:    comment,
-			Constraints: constraints,
+			Type:      cert.Type(),
+			CertBytes: cert.Marshal(),
+			X:         k.X,
+			Comments:  comment,
 		})
 	case *ecdsa.PrivateKey:
 		req = ssh.Marshal(ecdsaCertMsg{
-			Type:        cert.Type(),
-			CertBytes:   cert.Marshal(),
-			D:           k.D,
-			Comments:    comment,
-			Constraints: constraints,
-		})
-	case *ed25519.PrivateKey:
-		req = ssh.Marshal(ed25519CertMsg{
-			Type:        cert.Type(),
-			CertBytes:   cert.Marshal(),
-			Pub:         []byte(*k)[32:],
-			Priv:        []byte(*k),
-			Comments:    comment,
-			Constraints: constraints,
+			Type:      cert.Type(),
+			CertBytes: cert.Marshal(),
+			D:         k.D,
+			Comments:  comment,
 		})
 	default:
 		return fmt.Errorf("agent: unsupported key type %T", s)

vendor/golang.org/x/crypto/ssh/agent/keyring.go

@@ -11,7 +11,6 @@ import (
 	"errors"
 	"fmt"
 	"sync"
-	"time"
 
 	"golang.org/x/crypto/ssh"
 )
@@ -19,7 +18,6 @@ import (
 type privKey struct {
 	signer  ssh.Signer
 	comment string
-	expire  *time.Time
 }
 
 type keyring struct {
@@ -50,9 +48,15 @@ func (r *keyring) RemoveAll() error {
 	return nil
 }
 
-// removeLocked does the actual key removal. The caller must already be holding the
-// keyring mutex.
-func (r *keyring) removeLocked(want []byte) error {
+// Remove removes all identities with the given public key.
+func (r *keyring) Remove(key ssh.PublicKey) error {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if r.locked {
+		return errLocked
+	}
+
+	want := key.Marshal()
 	found := false
 	for i := 0; i < len(r.keys); {
 		if bytes.Equal(r.keys[i].signer.PublicKey().Marshal(), want) {
@@ -71,18 +75,7 @@ func (r *keyring) removeLocked(want []byte) error {
 	return nil
 }
 
-// Remove removes all identities with the given public key.
-func (r *keyring) Remove(key ssh.PublicKey) error {
-	r.mu.Lock()
-	defer r.mu.Unlock()
-	if r.locked {
-		return errLocked
-	}
-
-	return r.removeLocked(key.Marshal())
-}
-
-// Lock locks the agent. Sign and Remove will fail, and List will return an empty list.
+// Lock locks the agent. Sign and Remove will fail, and List will empty an empty list.
 func (r *keyring) Lock(passphrase []byte) error {
 	r.mu.Lock()
 	defer r.mu.Unlock()
@@ -111,17 +104,6 @@ func (r *keyring) Unlock(passphrase []byte) error {
 	return nil
 }
 
-// expireKeysLocked removes expired keys from the keyring. If a key was added
-// with a lifetimesecs contraint and seconds >= lifetimesecs seconds have
-// ellapsed, it is removed. The caller *must* be holding the keyring mutex.
-func (r *keyring) expireKeysLocked() {
-	for _, k := range r.keys {
-		if k.expire != nil && time.Now().After(*k.expire) {
-			r.removeLocked(k.signer.PublicKey().Marshal())
-		}
-	}
-}
-
 // List returns the identities known to the agent.
 func (r *keyring) List() ([]*Key, error) {
 	r.mu.Lock()
@@ -131,7 +113,6 @@ func (r *keyring) List() ([]*Key, error) {
 		return nil, nil
 	}
 
-	r.expireKeysLocked()
 	var ids []*Key
 	for _, k := range r.keys {
 		pub := k.signer.PublicKey()
@@ -165,17 +146,7 @@ func (r *keyring) Add(key AddedKey) error {
 		}
 	}
 
-	p := privKey{
-		signer:  signer,
-		comment: key.Comment,
-	}
-
-	if key.LifetimeSecs > 0 {
-		t := time.Now().Add(time.Duration(key.LifetimeSecs) * time.Second)
-		p.expire = &t
-	}
-
-	r.keys = append(r.keys, p)
+	r.keys = append(r.keys, privKey{signer, key.Comment})
 
 	return nil
 }
@@ -188,7 +159,6 @@ func (r *keyring) Sign(key ssh.PublicKey, data []byte) (*ssh.Signature, error) {
 		return nil, errLocked
 	}
 
-	r.expireKeysLocked()
 	wanted := key.Marshal()
 	for _, k := range r.keys {
 		if bytes.Equal(k.signer.PublicKey().Marshal(), wanted) {
@@ -206,7 +176,6 @@ func (r *keyring) Signers() ([]ssh.Signer, error) {
 		return nil, errLocked
 	}
 
-	r.expireKeysLocked()
 	s := make([]ssh.Signer, 0, len(r.keys))
 	for _, k := range r.keys {
 		s = append(s, k.signer)

vendor/golang.org/x/crypto/ssh/agent/server.go

@@ -5,18 +5,13 @@
 package agent
 
 import (
-	"crypto/dsa"
-	"crypto/ecdsa"
-	"crypto/elliptic"
 	"crypto/rsa"
 	"encoding/binary"
-	"errors"
 	"fmt"
 	"io"
 	"log"
 	"math/big"
 
-	"golang.org/x/crypto/ed25519"
 	"golang.org/x/crypto/ssh"
 )
 
@@ -54,9 +49,6 @@ func marshalKey(k *Key) []byte {
 	return ssh.Marshal(&record)
 }
 
-// See [PROTOCOL.agent], section 2.5.1.
-const agentV1IdentitiesAnswer = 2
-
 type agentV1IdentityMsg struct {
 	Numkeys uint32 `sshtype:"2"`
 }
@@ -77,10 +69,6 @@ func (s *server) processRequest(data []byte) (interface{}, error) {
 	switch data[0] {
 	case agentRequestV1Identities:
 		return &agentV1IdentityMsg{0}, nil
-
-	case agentRemoveAllV1Identities:
-		return nil, nil
-
 	case agentRemoveIdentity:
 		var req agentRemoveIdentityMsg
 		if err := ssh.Unmarshal(data, &req); err != nil {
@@ -133,7 +121,6 @@ func (s *server) processRequest(data []byte) (interface{}, error) {
 			return nil, err
 		}
 		return &signResponseAgentMsg{SigBlob: ssh.Marshal(sig)}, nil
-
 	case agentRequestIdentities:
 		keys, err := s.agent.List()
 		if err != nil {
@@ -147,271 +134,42 @@ func (s *server) processRequest(data []byte) (interface{}, error) {
 			rep.Keys = append(rep.Keys, marshalKey(k)...)
 		}
 		return rep, nil
-
-	case agentAddIdConstrained, agentAddIdentity:
+	case agentAddIdentity:
 		return nil, s.insertIdentity(data)
 	}
 
 	return nil, fmt.Errorf("unknown opcode %d", data[0])
 }
 
-func parseRSAKey(req []byte) (*AddedKey, error) {
-	var k rsaKeyMsg
-	if err := ssh.Unmarshal(req, &k); err != nil {
-		return nil, err
-	}
-	if k.E.BitLen() > 30 {
-		return nil, errors.New("agent: RSA public exponent too large")
-	}
-	priv := &rsa.PrivateKey{
-		PublicKey: rsa.PublicKey{
-			E: int(k.E.Int64()),
-			N: k.N,
-		},
-		D:      k.D,
-		Primes: []*big.Int{k.P, k.Q},
-	}
-	priv.Precompute()
-
-	return &AddedKey{PrivateKey: priv, Comment: k.Comments}, nil
-}
-
-func parseEd25519Key(req []byte) (*AddedKey, error) {
-	var k ed25519KeyMsg
-	if err := ssh.Unmarshal(req, &k); err != nil {
-		return nil, err
-	}
-	priv := ed25519.PrivateKey(k.Priv)
-	return &AddedKey{PrivateKey: &priv, Comment: k.Comments}, nil
-}
-
-func parseDSAKey(req []byte) (*AddedKey, error) {
-	var k dsaKeyMsg
-	if err := ssh.Unmarshal(req, &k); err != nil {
-		return nil, err
-	}
-	priv := &dsa.PrivateKey{
-		PublicKey: dsa.PublicKey{
-			Parameters: dsa.Parameters{
-				P: k.P,
-				Q: k.Q,
-				G: k.G,
-			},
-			Y: k.Y,
-		},
-		X: k.X,
-	}
-
-	return &AddedKey{PrivateKey: priv, Comment: k.Comments}, nil
-}
-
-func unmarshalECDSA(curveName string, keyBytes []byte, privScalar *big.Int) (priv *ecdsa.PrivateKey, err error) {
-	priv = &ecdsa.PrivateKey{
-		D: privScalar,
-	}
-
-	switch curveName {
-	case "nistp256":
-		priv.Curve = elliptic.P256()
-	case "nistp384":
-		priv.Curve = elliptic.P384()
-	case "nistp521":
-		priv.Curve = elliptic.P521()
-	default:
-		return nil, fmt.Errorf("agent: unknown curve %q", curveName)
-	}
-
-	priv.X, priv.Y = elliptic.Unmarshal(priv.Curve, keyBytes)
-	if priv.X == nil || priv.Y == nil {
-		return nil, errors.New("agent: point not on curve")
-	}
-
-	return priv, nil
-}
-
-func parseEd25519Cert(req []byte) (*AddedKey, error) {
-	var k ed25519CertMsg
-	if err := ssh.Unmarshal(req, &k); err != nil {
-		return nil, err
-	}
-	pubKey, err := ssh.ParsePublicKey(k.CertBytes)
-	if err != nil {
-		return nil, err
-	}
-	priv := ed25519.PrivateKey(k.Priv)
-	cert, ok := pubKey.(*ssh.Certificate)
-	if !ok {
-		return nil, errors.New("agent: bad ED25519 certificate")
-	}
-	return &AddedKey{PrivateKey: &priv, Certificate: cert, Comment: k.Comments}, nil
-}
-
-func parseECDSAKey(req []byte) (*AddedKey, error) {
-	var k ecdsaKeyMsg
-	if err := ssh.Unmarshal(req, &k); err != nil {
-		return nil, err
-	}
-
-	priv, err := unmarshalECDSA(k.Curve, k.KeyBytes, k.D)
-	if err != nil {
-		return nil, err
-	}
-
-	return &AddedKey{PrivateKey: priv, Comment: k.Comments}, nil
-}
-
-func parseRSACert(req []byte) (*AddedKey, error) {
-	var k rsaCertMsg
-	if err := ssh.Unmarshal(req, &k); err != nil {
-		return nil, err
-	}
-
-	pubKey, err := ssh.ParsePublicKey(k.CertBytes)
-	if err != nil {
-		return nil, err
-	}
-
-	cert, ok := pubKey.(*ssh.Certificate)
-	if !ok {
-		return nil, errors.New("agent: bad RSA certificate")
-	}
-
-	// An RSA publickey as marshaled by rsaPublicKey.Marshal() in keys.go
-	var rsaPub struct {
-		Name string
-		E    *big.Int
-		N    *big.Int
-	}
-	if err := ssh.Unmarshal(cert.Key.Marshal(), &rsaPub); err != nil {
-		return nil, fmt.Errorf("agent: Unmarshal failed to parse public key: %v", err)
-	}
-
-	if rsaPub.E.BitLen() > 30 {
-		return nil, errors.New("agent: RSA public exponent too large")
-	}
-
-	priv := rsa.PrivateKey{
-		PublicKey: rsa.PublicKey{
-			E: int(rsaPub.E.Int64()),
-			N: rsaPub.N,
-		},
-		D:      k.D,
-		Primes: []*big.Int{k.Q, k.P},
-	}
-	priv.Precompute()
-
-	return &AddedKey{PrivateKey: &priv, Certificate: cert, Comment: k.Comments}, nil
-}
-
-func parseDSACert(req []byte) (*AddedKey, error) {
-	var k dsaCertMsg
-	if err := ssh.Unmarshal(req, &k); err != nil {
-		return nil, err
-	}
-	pubKey, err := ssh.ParsePublicKey(k.CertBytes)
-	if err != nil {
-		return nil, err
-	}
-	cert, ok := pubKey.(*ssh.Certificate)
-	if !ok {
-		return nil, errors.New("agent: bad DSA certificate")
-	}
-
-	// A DSA publickey as marshaled by dsaPublicKey.Marshal() in keys.go
-	var w struct {
-		Name       string
-		P, Q, G, Y *big.Int
-	}
-	if err := ssh.Unmarshal(cert.Key.Marshal(), &w); err != nil {
-		return nil, fmt.Errorf("agent: Unmarshal failed to parse public key: %v", err)
-	}
-
-	priv := &dsa.PrivateKey{
-		PublicKey: dsa.PublicKey{
-			Parameters: dsa.Parameters{
-				P: w.P,
-				Q: w.Q,
-				G: w.G,
-			},
-			Y: w.Y,
-		},
-		X: k.X,
-	}
-
-	return &AddedKey{PrivateKey: priv, Certificate: cert, Comment: k.Comments}, nil
-}
-
-func parseECDSACert(req []byte) (*AddedKey, error) {
-	var k ecdsaCertMsg
-	if err := ssh.Unmarshal(req, &k); err != nil {
-		return nil, err
-	}
-
-	pubKey, err := ssh.ParsePublicKey(k.CertBytes)
-	if err != nil {
-		return nil, err
-	}
-	cert, ok := pubKey.(*ssh.Certificate)
-	if !ok {
-		return nil, errors.New("agent: bad ECDSA certificate")
-	}
-
-	// An ECDSA publickey as marshaled by ecdsaPublicKey.Marshal() in keys.go
-	var ecdsaPub struct {
-		Name string
-		ID   string
-		Key  []byte
-	}
-	if err := ssh.Unmarshal(cert.Key.Marshal(), &ecdsaPub); err != nil {
-		return nil, err
-	}
-
-	priv, err := unmarshalECDSA(ecdsaPub.ID, ecdsaPub.Key, k.D)
-	if err != nil {
-		return nil, err
-	}
-
-	return &AddedKey{PrivateKey: priv, Certificate: cert, Comment: k.Comments}, nil
-}
-
 func (s *server) insertIdentity(req []byte) error {
 	var record struct {
-		Type string `sshtype:"17|25"`
+		Type string `sshtype:"17"`
 		Rest []byte `ssh:"rest"`
 	}
-
 	if err := ssh.Unmarshal(req, &record); err != nil {
 		return err
 	}
 
-	var addedKey *AddedKey
-	var err error
-
 	switch record.Type {
 	case ssh.KeyAlgoRSA:
-		addedKey, err = parseRSAKey(req)
-	case ssh.KeyAlgoDSA:
-		addedKey, err = parseDSAKey(req)
-	case ssh.KeyAlgoECDSA256, ssh.KeyAlgoECDSA384, ssh.KeyAlgoECDSA521:
-		addedKey, err = parseECDSAKey(req)
-	case ssh.KeyAlgoED25519:
-		addedKey, err = parseEd25519Key(req)
-	case ssh.CertAlgoRSAv01:
-		addedKey, err = parseRSACert(req)
-	case ssh.CertAlgoDSAv01:
-		addedKey, err = parseDSACert(req)
-	case ssh.CertAlgoECDSA256v01, ssh.CertAlgoECDSA384v01, ssh.CertAlgoECDSA521v01:
-		addedKey, err = parseECDSACert(req)
-	case ssh.CertAlgoED25519v01:
-		addedKey, err = parseEd25519Cert(req)
-	default:
-		return fmt.Errorf("agent: not implemented: %q", record.Type)
-	}
+		var k rsaKeyMsg
+		if err := ssh.Unmarshal(req, &k); err != nil {
+			return err
+		}
 
-	if err != nil {
-		return err
+		priv := rsa.PrivateKey{
+			PublicKey: rsa.PublicKey{
+				E: int(k.E.Int64()),
+				N: k.N,
+			},
+			D:      k.D,
+			Primes: []*big.Int{k.P, k.Q},
+		}
+		priv.Precompute()
+
+		return s.agent.Add(AddedKey{PrivateKey: &priv, Comment: k.Comments})
 	}
-	return s.agent.Add(*addedKey)
+	return fmt.Errorf("not implemented: %s", record.Type)
 }
 
 // ServeAgent serves the agent protocol on the given connection. It

vendor/golang.org/x/crypto/ssh/certs.go

@@ -22,7 +22,6 @@ const (
 	CertAlgoECDSA256v01 = "ecdsa-sha2-nistp256-cert-v01@openssh.com"
 	CertAlgoECDSA384v01 = "ecdsa-sha2-nistp384-cert-v01@openssh.com"
 	CertAlgoECDSA521v01 = "ecdsa-sha2-nistp521-cert-v01@openssh.com"
-	CertAlgoED25519v01  = "ssh-ed25519-cert-v01@openssh.com"
 )
 
 // Certificate types distinguish between host and user
@@ -402,7 +401,6 @@ var certAlgoNames = map[string]string{
 	KeyAlgoECDSA256: CertAlgoECDSA256v01,
 	KeyAlgoECDSA384: CertAlgoECDSA384v01,
 	KeyAlgoECDSA521: CertAlgoECDSA521v01,
-	KeyAlgoED25519:  CertAlgoED25519v01,
 }
 
 // certToPrivAlgo returns the underlying algorithm for a certificate algorithm.
@@ -461,7 +459,7 @@ func (c *Certificate) Marshal() []byte {
 func (c *Certificate) Type() string {
 	algo, ok := certAlgoNames[c.Key.Type()]
 	if !ok {
-		panic("unknown cert key type " + c.Key.Type())
+		panic("unknown cert key type")
 	}
 	return algo
 }

vendor/golang.org/x/crypto/ssh/channel.go

@@ -67,8 +67,6 @@ type Channel interface {
 	// boolean, otherwise the return value will be false. Channel
 	// requests are out-of-band messages so they may be sent even
 	// if the data stream is closed or blocked by flow control.
-	// If the channel is closed before a reply is returned, io.EOF
-	// is returned.
 	SendRequest(name string, wantReply bool, payload []byte) (bool, error)
 
 	// Stderr returns an io.ReadWriter that writes to this channel
@@ -219,7 +217,7 @@ func (c *channel) writePacket(packet []byte) error {
 
 func (c *channel) sendMessage(msg interface{}) error {
 	if debugMux {
-		log.Printf("send(%d): %#v", c.mux.chanList.offset, msg)
+		log.Printf("send %d: %#v", c.mux.chanList.offset, msg)
 	}
 
 	p := Marshal(msg)
@@ -373,7 +371,7 @@ func (c *channel) close() {
 	close(c.msg)
 	close(c.incomingRequests)
 	c.writeMu.Lock()
-	// This is not necessary for a normal channel teardown, but if
+	// This is not necesary for a normal channel teardown, but if
 	// there was another error, it is.
 	c.sentClose = true
 	c.writeMu.Unlock()

vendor/golang.org/x/crypto/ssh/cipher.go

@@ -7,7 +7,6 @@ package ssh
 import (
 	"crypto/aes"
 	"crypto/cipher"
-	"crypto/des"
 	"crypto/rc4"
 	"crypto/subtle"
 	"encoding/binary"
@@ -122,9 +121,6 @@ var cipherModes = map[string]*streamCipherMode{
 	// You should expect that an active attacker can recover plaintext if
 	// you do.
 	aes128cbcID: {16, aes.BlockSize, 0, nil},
-
-	// 3des-cbc is insecure and is disabled by default.
-	tripledescbcID: {24, des.BlockSize, 0, nil},
 }
 
 // prefixLen is the length of the packet prefix that contains the packet length
@@ -372,7 +368,12 @@ type cbcCipher struct {
 	oracleCamouflage uint32
 }
 
-func newCBCCipher(c cipher.Block, iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
+func newAESCBCCipher(iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
+	c, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
 	cbc := &cbcCipher{
 		mac:        macModes[algs.MAC].new(macKey),
 		decrypter:  cipher.NewCBCDecrypter(c, iv),
@@ -386,34 +387,6 @@ func newCBCCipher(c cipher.Block, iv, key, macKey []byte, algs directionAlgorith
 	return cbc, nil
 }
 
-func newAESCBCCipher(iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
-	c, err := aes.NewCipher(key)
-	if err != nil {
-		return nil, err
-	}
-
-	cbc, err := newCBCCipher(c, iv, key, macKey, algs)
-	if err != nil {
-		return nil, err
-	}
-
-	return cbc, nil
-}
-
-func newTripleDESCBCCipher(iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
-	c, err := des.NewTripleDESCipher(key)
-	if err != nil {
-		return nil, err
-	}
-
-	cbc, err := newCBCCipher(c, iv, key, macKey, algs)
-	if err != nil {
-		return nil, err
-	}
-
-	return cbc, nil
-}
-
 func maxUInt32(a, b int) uint32 {
 	if a > b {
 		return uint32(a)

vendor/golang.org/x/crypto/ssh/client.go

@@ -9,7 +9,6 @@ import (
 	"fmt"
 	"net"
 	"sync"
-	"time"
 )
 
 // Client implements a traditional SSH client that supports shells,
@@ -97,10 +96,16 @@ func (c *connection) clientHandshake(dialAddress string, config *ClientConfig) e
 	c.transport = newClientTransport(
 		newTransport(c.sshConn.conn, config.Rand, true /* is client */),
 		c.clientVersion, c.serverVersion, config, dialAddress, c.sshConn.RemoteAddr())
-	if err := c.transport.requestInitialKeyChange(); err != nil {
+	if err := c.transport.requestKeyChange(); err != nil {
 		return err
 	}
 
+	if packet, err := c.transport.readPacket(); err != nil {
+		return err
+	} else if packet[0] != msgNewKeys {
+		return unexpectedMessageError(msgNewKeys, packet[0])
+	}
+
 	// We just did the key change, so the session ID is established.
 	c.sessionID = c.transport.getSessionID()
 
@@ -164,7 +169,7 @@ func (c *Client) handleChannelOpens(in <-chan NewChannel) {
 // to incoming channels and requests, use net.Dial with NewClientConn
 // instead.
 func Dial(network, addr string, config *ClientConfig) (*Client, error) {
-	conn, err := net.DialTimeout(network, addr, config.Timeout)
+	conn, err := net.Dial(network, addr)
 	if err != nil {
 		return nil, err
 	}
@@ -205,9 +210,4 @@ type ClientConfig struct {
 	// string returned from PublicKey.Type method may be used, or
 	// any of the CertAlgoXxxx and KeyAlgoXxxx constants.
 	HostKeyAlgorithms []string
-
-	// Timeout is the maximum amount of time for the TCP connection to establish.
-	//
-	// A Timeout of zero means no timeout.
-	Timeout time.Duration
 }

vendor/golang.org/x/crypto/ssh/client_auth.go

@@ -321,6 +321,8 @@ func handleAuthResponse(c packetConn) (bool, []string, error) {
 			return false, msg.Methods, nil
 		case msgUserAuthSuccess:
 			return true, nil, nil
+		case msgDisconnect:
+			return false, nil, io.EOF
 		default:
 			return false, nil, unexpectedMessageError(msgUserAuthSuccess, packet[0])
 		}
@@ -437,37 +439,3 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe
 		}
 	}
 }
-
-type retryableAuthMethod struct {
-	authMethod AuthMethod
-	maxTries   int
-}
-
-func (r *retryableAuthMethod) auth(session []byte, user string, c packetConn, rand io.Reader) (ok bool, methods []string, err error) {
-	for i := 0; r.maxTries <= 0 || i < r.maxTries; i++ {
-		ok, methods, err = r.authMethod.auth(session, user, c, rand)
-		if ok || err != nil { // either success or error terminate
-			return ok, methods, err
-		}
-	}
-	return ok, methods, err
-}
-
-func (r *retryableAuthMethod) method() string {
-	return r.authMethod.method()
-}
-
-// RetryableAuthMethod is a decorator for other auth methods enabling them to
-// be retried up to maxTries before considering that AuthMethod itself failed.
-// If maxTries is <= 0, will retry indefinitely
-//
-// This is useful for interactive clients using challenge/response type
-// authentication (e.g. Keyboard-Interactive, Password, etc) where the user
-// could mistype their response resulting in the server issuing a
-// SSH_MSG_USERAUTH_FAILURE (rfc4252 #8 [password] and rfc4256 #3.4
-// [keyboard-interactive]); Without this decorator, the non-retryable
-// AuthMethod would be removed from future consideration, and never tried again
-// (and so the user would never be able to retry their entry).
-func RetryableAuthMethod(auth AuthMethod, maxTries int) AuthMethod {
-	return &retryableAuthMethod{authMethod: auth, maxTries: maxTries}
-}

vendor/golang.org/x/crypto/ssh/common.go

@@ -44,12 +44,10 @@ var supportedKexAlgos = []string{
 // of authenticating servers) in preference order.
 var supportedHostKeyAlgos = []string{
 	CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01,
-	CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoED25519v01,
+	CertAlgoECDSA384v01, CertAlgoECDSA521v01,
 
 	KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521,
 	KeyAlgoRSA, KeyAlgoDSA,
-
-	KeyAlgoED25519,
 }
 
 // supportedMACs specifies a default set of MAC algorithms in preference order.

vendor/golang.org/x/crypto/ssh/connection.go

@@ -23,6 +23,7 @@ func (e *OpenChannelError) Error() string {
 // ConnMetadata holds metadata for the connection.
 type ConnMetadata interface {
 	// User returns the user ID for this connection.
+	// It is empty if no authentication is used.
 	User() string
 
 	// SessionID returns the sesson hash, also denoted by H.

vendor/golang.org/x/crypto/ssh/doc.go

@@ -15,4 +15,4 @@ References:
   [PROTOCOL.certkeys]: http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL.certkeys?rev=HEAD
   [SSH-PARAMETERS]:    http://www.iana.org/assignments/ssh-parameters/ssh-parameters.xml#ssh-parameters-1
 */
-package ssh // import "golang.org/x/crypto/ssh"
+package ssh

vendor/golang.org/x/crypto/ssh/handshake.go

@@ -29,6 +29,25 @@ type keyingTransport interface {
 	// direction will be effected if a msgNewKeys message is sent
 	// or received.
 	prepareKeyChange(*algorithms, *kexResult) error
+
+	// getSessionID returns the session ID. prepareKeyChange must
+	// have been called once.
+	getSessionID() []byte
+}
+
+// rekeyingTransport is the interface of handshakeTransport that we
+// (internally) expose to ClientConn and ServerConn.
+type rekeyingTransport interface {
+	packetConn
+
+	// requestKeyChange asks the remote side to change keys. All
+	// writes are blocked until the key change succeeds, which is
+	// signaled by reading a msgNewKeys.
+	requestKeyChange() error
+
+	// getSessionID returns the session ID. This is only valid
+	// after the first key change has completed.
+	getSessionID() []byte
 }
 
 // handshakeTransport implements rekeying on top of a keyingTransport
@@ -67,9 +86,6 @@ type handshakeTransport struct {
 	sentInitMsg     *kexInitMsg
 	writtenSinceKex uint64
 	writeError      error
-
-	// The session ID or nil if first kex did not complete yet.
-	sessionID []byte
 }
 
 func newHandshakeTransport(conn keyingTransport, config *Config, clientVersion, serverVersion []byte) *handshakeTransport {
@@ -106,7 +122,7 @@ func newServerTransport(conn keyingTransport, clientVersion, serverVersion []byt
 }
 
 func (t *handshakeTransport) getSessionID() []byte {
-	return t.sessionID
+	return t.conn.getSessionID()
 }
 
 func (t *handshakeTransport) id() string {
@@ -161,22 +177,15 @@ func (t *handshakeTransport) readOnePacket() ([]byte, error) {
 
 	t.readSinceKex += uint64(len(p))
 	if debugHandshake {
-		if p[0] == msgChannelData || p[0] == msgChannelExtendedData {
-			log.Printf("%s got data (packet %d bytes)", t.id(), len(p))
-		} else {
-			msg, err := decode(p)
-			log.Printf("%s got %T %v (%v)", t.id(), msg, msg, err)
-		}
+		msg, err := decode(p)
+		log.Printf("%s got %T %v (%v)", t.id(), msg, msg, err)
 	}
 	if p[0] != msgKexInit {
 		return p, nil
 	}
+	err = t.enterKeyExchange(p)
 
 	t.mu.Lock()
-
-	firstKex := t.sessionID == nil
-
-	err = t.enterKeyExchangeLocked(p)
 	if err != nil {
 		// drop connection
 		t.conn.Close()
@@ -184,7 +193,7 @@ func (t *handshakeTransport) readOnePacket() ([]byte, error) {
 	}
 
 	if debugHandshake {
-		log.Printf("%s exited key exchange (first %v), err %v", t.id(), firstKex, err)
+		log.Printf("%s exited key exchange, err %v", t.id(), err)
 	}
 
 	// Unblock writers.
@@ -199,69 +208,28 @@ func (t *handshakeTransport) readOnePacket() ([]byte, error) {
 	}
 
 	t.readSinceKex = 0
-
-	// By default, a key exchange is hidden from higher layers by
-	// translating it into msgIgnore.
-	successPacket := []byte{msgIgnore}
-	if firstKex {
-		// sendKexInit() for the first kex waits for
-		// msgNewKeys so the authentication process is
-		// guaranteed to happen over an encrypted transport.
-		successPacket = []byte{msgNewKeys}
-	}
-
-	return successPacket, nil
+	return []byte{msgNewKeys}, nil
 }
 
-// keyChangeCategory describes whether a key exchange is the first on a
-// connection, or a subsequent one.
-type keyChangeCategory bool
-
-const (
-	firstKeyExchange      keyChangeCategory = true
-	subsequentKeyExchange keyChangeCategory = false
-)
-
 // sendKexInit sends a key change message, and returns the message
 // that was sent. After initiating the key change, all writes will be
 // blocked until the change is done, and a failed key change will
 // close the underlying transport. This function is safe for
 // concurrent use by multiple goroutines.
-func (t *handshakeTransport) sendKexInit(isFirst keyChangeCategory) error {
-	var err error
-
+func (t *handshakeTransport) sendKexInit() (*kexInitMsg, []byte, error) {
 	t.mu.Lock()
-	// If this is the initial key change, but we already have a sessionID,
-	// then do nothing because the key exchange has already completed
-	// asynchronously.
-	if !isFirst || t.sessionID == nil {
-		_, _, err = t.sendKexInitLocked(isFirst)
-	}
-	t.mu.Unlock()
-	if err != nil {
-		return err
-	}
-	if isFirst {
-		if packet, err := t.readPacket(); err != nil {
-			return err
-		} else if packet[0] != msgNewKeys {
-			return unexpectedMessageError(msgNewKeys, packet[0])
-		}
-	}
-	return nil
-}
-
-func (t *handshakeTransport) requestInitialKeyChange() error {
-	return t.sendKexInit(firstKeyExchange)
+	defer t.mu.Unlock()
+	return t.sendKexInitLocked()
 }
 
 func (t *handshakeTransport) requestKeyChange() error {
-	return t.sendKexInit(subsequentKeyExchange)
+	_, _, err := t.sendKexInit()
+	return err
 }
 
 // sendKexInitLocked sends a key change message. t.mu must be locked
 // while this happens.
-func (t *handshakeTransport) sendKexInitLocked(isFirst keyChangeCategory) (*kexInitMsg, []byte, error) {
+func (t *handshakeTransport) sendKexInitLocked() (*kexInitMsg, []byte, error) {
 	// kexInits may be sent either in response to the other side,
 	// or because our side wants to initiate a key change, so we
 	// may have already sent a kexInit. In that case, don't send a
@@ -269,7 +237,6 @@ func (t *handshakeTransport) sendKexInitLocked(isFirst keyChangeCategory) (*kexI
 	if t.sentInitMsg != nil {
 		return t.sentInitMsg, t.sentInitPacket, nil
 	}
-
 	msg := &kexInitMsg{
 		KexAlgos:                t.config.KeyExchanges,
 		CiphersClientServer:     t.config.Ciphers,
@@ -309,7 +276,7 @@ func (t *handshakeTransport) writePacket(p []byte) error {
 	defer t.mu.Unlock()
 
 	if t.writtenSinceKex > t.config.RekeyThreshold {
-		t.sendKexInitLocked(subsequentKeyExchange)
+		t.sendKexInitLocked()
 	}
 	for t.sentInitMsg != nil && t.writeError == nil {
 		t.cond.Wait()
@@ -333,12 +300,12 @@ func (t *handshakeTransport) Close() error {
 	return t.conn.Close()
 }
 
-// enterKeyExchange runs the key exchange. t.mu must be held while running this.
-func (t *handshakeTransport) enterKeyExchangeLocked(otherInitPacket []byte) error {
+// enterKeyExchange runs the key exchange.
+func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error {
 	if debugHandshake {
 		log.Printf("%s entered key exchange", t.id())
 	}
-	myInit, myInitPacket, err := t.sendKexInitLocked(subsequentKeyExchange)
+	myInit, myInitPacket, err := t.sendKexInit()
 	if err != nil {
 		return err
 	}
@@ -371,16 +338,7 @@ func (t *handshakeTransport) enterKeyExchangeLocked(otherInitPacket []byte) erro
 	}
 
 	// We don't send FirstKexFollows, but we handle receiving it.
-	//
-	// RFC 4253 section 7 defines the kex and the agreement method for
-	// first_kex_packet_follows. It states that the guessed packet
-	// should be ignored if the "kex algorithm and/or the host
-	// key algorithm is guessed wrong (server and client have
-	// different preferred algorithm), or if any of the other
-	// algorithms cannot be agreed upon". The other algorithms have
-	// already been checked above so the kex algorithm and host key
-	// algorithm are checked here.
-	if otherInit.FirstKexFollows && (clientInit.KexAlgos[0] != serverInit.KexAlgos[0] || clientInit.ServerHostKeyAlgos[0] != serverInit.ServerHostKeyAlgos[0]) {
+	if otherInit.FirstKexFollows && algs.kex != otherInit.KexAlgos[0] {
 		// other side sent a kex message for the wrong algorithm,
 		// which we have to ignore.
 		if _, err := t.conn.readPacket(); err != nil {
@@ -404,11 +362,6 @@ func (t *handshakeTransport) enterKeyExchangeLocked(otherInitPacket []byte) erro
 		return err
 	}
 
-	if t.sessionID == nil {
-		t.sessionID = result.H
-	}
-	result.SessionID = t.sessionID
-
 	t.conn.prepareKeyChange(algs, result)
 	if err = t.conn.writePacket([]byte{msgNewKeys}); err != nil {
 		return err
@@ -418,7 +371,6 @@ func (t *handshakeTransport) enterKeyExchangeLocked(otherInitPacket []byte) erro
 	} else if packet[0] != msgNewKeys {
 		return unexpectedMessageError(msgNewKeys, packet[0])
 	}
-
 	return nil
 }
 

vendor/golang.org/x/crypto/ssh/kex.go

@@ -46,7 +46,7 @@ type kexResult struct {
 	Hash crypto.Hash
 
 	// The session ID, which is the first H computed. This is used
-	// to derive key material inside the transport.
+	// to signal data inside transport.
 	SessionID []byte
 }
 
@@ -77,11 +77,11 @@ type kexAlgorithm interface {
 
 // dhGroup is a multiplicative group suitable for implementing Diffie-Hellman key agreement.
 type dhGroup struct {
-	g, p, pMinus1 *big.Int
+	g, p *big.Int
 }
 
 func (group *dhGroup) diffieHellman(theirPublic, myPrivate *big.Int) (*big.Int, error) {
-	if theirPublic.Cmp(bigOne) <= 0 || theirPublic.Cmp(group.pMinus1) >= 0 {
+	if theirPublic.Sign() <= 0 || theirPublic.Cmp(group.p) >= 0 {
 		return nil, errors.New("ssh: DH parameter out of bounds")
 	}
 	return new(big.Int).Exp(theirPublic, myPrivate, group.p), nil
@@ -90,17 +90,10 @@ func (group *dhGroup) diffieHellman(theirPublic, myPrivate *big.Int) (*big.Int,
 func (group *dhGroup) Client(c packetConn, randSource io.Reader, magics *handshakeMagics) (*kexResult, error) {
 	hashFunc := crypto.SHA1
 
-	var x *big.Int
-	for {
-		var err error
-		if x, err = rand.Int(randSource, group.pMinus1); err != nil {
-			return nil, err
-		}
-		if x.Sign() > 0 {
-			break
-		}
+	x, err := rand.Int(randSource, group.p)
+	if err != nil {
+		return nil, err
 	}
-
 	X := new(big.Int).Exp(group.g, x, group.p)
 	kexDHInit := kexDHInitMsg{
 		X: X,
@@ -153,14 +146,9 @@ func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handsha
 		return
 	}
 
-	var y *big.Int
-	for {
-		if y, err = rand.Int(randSource, group.pMinus1); err != nil {
-			return
-		}
-		if y.Sign() > 0 {
-			break
-		}
+	y, err := rand.Int(randSource, group.p)
+	if err != nil {
+		return
 	}
 
 	Y := new(big.Int).Exp(group.g, y, group.p)
@@ -385,7 +373,6 @@ func init() {
 	kexAlgoMap[kexAlgoDH1SHA1] = &dhGroup{
 		g: new(big.Int).SetInt64(2),
 		p: p,
-		pMinus1: new(big.Int).Sub(p, bigOne),
 	}
 
 	// This is the group called diffie-hellman-group14-sha1 in RFC
@@ -395,7 +382,6 @@ func init() {
 	kexAlgoMap[kexAlgoDH14SHA1] = &dhGroup{
 		g: new(big.Int).SetInt64(2),
 		p: p,
-		pMinus1: new(big.Int).Sub(p, bigOne),
 	}
 
 	kexAlgoMap[kexAlgoECDH521] = &ecdh{elliptic.P521()}

vendor/golang.org/x/crypto/ssh/keys.go

@@ -20,8 +20,6 @@ import (
 	"io"
 	"math/big"
 	"strings"
-
-	"golang.org/x/crypto/ed25519"
 )
 
 // These constants represent the algorithm names for key types supported by this
@@ -32,7 +30,6 @@ const (
 	KeyAlgoECDSA256 = "ecdsa-sha2-nistp256"
 	KeyAlgoECDSA384 = "ecdsa-sha2-nistp384"
 	KeyAlgoECDSA521 = "ecdsa-sha2-nistp521"
-	KeyAlgoED25519  = "ssh-ed25519"
 )
 
 // parsePubKey parses a public key of the given algorithm.
@@ -45,16 +42,14 @@ func parsePubKey(in []byte, algo string) (pubKey PublicKey, rest []byte, err err
 		return parseDSA(in)
 	case KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521:
 		return parseECDSA(in)
-	case KeyAlgoED25519:
-		return parseED25519(in)
-	case CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoED25519v01:
+	case CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01:
 		cert, err := parseCert(in, certToPrivAlgo(algo))
 		if err != nil {
 			return nil, nil, err
 		}
 		return cert, nil, nil
 	}
-	return nil, nil, fmt.Errorf("ssh: unknown key algorithm: %v", algo)
+	return nil, nil, fmt.Errorf("ssh: unknown key algorithm: %v", err)
 }
 
 // parseAuthorizedKey parses a public key in OpenSSH authorized_keys format
@@ -125,7 +120,7 @@ func ParseKnownHosts(in []byte) (marker string, hosts []string, pubKey PublicKey
 			continue
 		}
 
-		// Strip out the beginning of the known_host key.
+		// Strip out the begining of the known_host key.
 		// This is either an optional marker or a (set of) hostname(s).
 		keyFields := bytes.Fields(in)
 		if len(keyFields) < 3 || len(keyFields) > 5 {
@@ -281,12 +276,6 @@ type PublicKey interface {
 	Verify(data []byte, sig *Signature) error
 }
 
-// CryptoPublicKey, if implemented by a PublicKey,
-// returns the underlying crypto.PublicKey form of the key.
-type CryptoPublicKey interface {
-	CryptoPublicKey() crypto.PublicKey
-}
-
 // A Signer can create signatures that verify against a public key.
 type Signer interface {
 	// PublicKey returns an associated PublicKey instance.
@@ -330,8 +319,6 @@ func parseRSA(in []byte) (out PublicKey, rest []byte, err error) {
 
 func (r *rsaPublicKey) Marshal() []byte {
 	e := new(big.Int).SetInt64(int64(r.E))
-	// RSA publickey struct layout should match the struct used by
-	// parseRSACert in the x/crypto/ssh/agent package.
 	wirekey := struct {
 		Name string
 		E    *big.Int
@@ -354,10 +341,6 @@ func (r *rsaPublicKey) Verify(data []byte, sig *Signature) error {
 	return rsa.VerifyPKCS1v15((*rsa.PublicKey)(r), crypto.SHA1, digest, sig.Blob)
 }
 
-func (r *rsaPublicKey) CryptoPublicKey() crypto.PublicKey {
-	return (*rsa.PublicKey)(r)
-}
-
 type dsaPublicKey dsa.PublicKey
 
 func (r *dsaPublicKey) Type() string {
@@ -386,8 +369,6 @@ func parseDSA(in []byte) (out PublicKey, rest []byte, err error) {
 }
 
 func (k *dsaPublicKey) Marshal() []byte {
-	// DSA publickey struct layout should match the struct used by
-	// parseDSACert in the x/crypto/ssh/agent package.
 	w := struct {
 		Name       string
 		P, Q, G, Y *big.Int
@@ -426,10 +407,6 @@ func (k *dsaPublicKey) Verify(data []byte, sig *Signature) error {
 	return errors.New("ssh: signature did not verify")
 }
 
-func (k *dsaPublicKey) CryptoPublicKey() crypto.PublicKey {
-	return (*dsa.PublicKey)(k)
-}
-
 type dsaPrivateKey struct {
 	*dsa.PrivateKey
 }
@@ -478,55 +455,6 @@ func (key *ecdsaPublicKey) nistID() string {
 	panic("ssh: unsupported ecdsa key size")
 }
 
-type ed25519PublicKey ed25519.PublicKey
-
-func (key ed25519PublicKey) Type() string {
-	return KeyAlgoED25519
-}
-
-func parseED25519(in []byte) (out PublicKey, rest []byte, err error) {
-	var w struct {
-		KeyBytes []byte
-		Rest     []byte `ssh:"rest"`
-	}
-
-	if err := Unmarshal(in, &w); err != nil {
-		return nil, nil, err
-	}
-
-	key := ed25519.PublicKey(w.KeyBytes)
-
-	return (ed25519PublicKey)(key), w.Rest, nil
-}
-
-func (key ed25519PublicKey) Marshal() []byte {
-	w := struct {
-		Name     string
-		KeyBytes []byte
-	}{
-		KeyAlgoED25519,
-		[]byte(key),
-	}
-	return Marshal(&w)
-}
-
-func (key ed25519PublicKey) Verify(b []byte, sig *Signature) error {
-	if sig.Format != key.Type() {
-		return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, key.Type())
-	}
-
-	edKey := (ed25519.PublicKey)(key)
-	if ok := ed25519.Verify(edKey, b, sig.Blob); !ok {
-		return errors.New("ssh: signature did not verify")
-	}
-
-	return nil
-}
-
-func (k ed25519PublicKey) CryptoPublicKey() crypto.PublicKey {
-	return ed25519.PublicKey(k)
-}
-
 func supportedEllipticCurve(curve elliptic.Curve) bool {
 	return curve == elliptic.P256() || curve == elliptic.P384() || curve == elliptic.P521()
 }
@@ -579,8 +507,6 @@ func parseECDSA(in []byte) (out PublicKey, rest []byte, err error) {
 func (key *ecdsaPublicKey) Marshal() []byte {
 	// See RFC 5656, section 3.1.
 	keyBytes := elliptic.Marshal(key.Curve, key.X, key.Y)
-	// ECDSA publickey struct layout should match the struct used by
-	// parseECDSACert in the x/crypto/ssh/agent package.
 	w := struct {
 		Name string
 		ID   string
@@ -622,10 +548,6 @@ func (key *ecdsaPublicKey) Verify(data []byte, sig *Signature) error {
 	return errors.New("ssh: signature did not verify")
 }
 
-func (k *ecdsaPublicKey) CryptoPublicKey() crypto.PublicKey {
-	return (*ecdsa.PublicKey)(k)
-}
-
 // NewSignerFromKey takes an *rsa.PrivateKey, *dsa.PrivateKey,
 // *ecdsa.PrivateKey or any other crypto.Signer and returns a corresponding
 // Signer instance. ECDSA keys must use P-256, P-384 or P-521.
@@ -669,19 +591,13 @@ func (s *wrappedSigner) Sign(rand io.Reader, data []byte) (*Signature, error) {
 		hashFunc = crypto.SHA1
 	case *ecdsaPublicKey:
 		hashFunc = ecHash(key.Curve)
-	case ed25519PublicKey:
 	default:
 		return nil, fmt.Errorf("ssh: unsupported key type %T", key)
 	}
 
-	var digest []byte
-	if hashFunc != 0 {
-		h := hashFunc.New()
-		h.Write(data)
-		digest = h.Sum(nil)
-	} else {
-		digest = data
-	}
+	h := hashFunc.New()
+	h.Write(data)
+	digest := h.Sum(nil)
 
 	signature, err := s.signer.Sign(rand, digest, hashFunc)
 	if err != nil {
@@ -721,9 +637,9 @@ func (s *wrappedSigner) Sign(rand io.Reader, data []byte) (*Signature, error) {
 	}, nil
 }
 
-// NewPublicKey takes an *rsa.PublicKey, *dsa.PublicKey, *ecdsa.PublicKey,
-// or ed25519.PublicKey returns a corresponding PublicKey instance.
-// ECDSA keys must use P-256, P-384 or P-521.
+// NewPublicKey takes an *rsa.PublicKey, *dsa.PublicKey, *ecdsa.PublicKey or
+// any other crypto.Signer and returns a corresponding Signer instance. ECDSA
+// keys must use P-256, P-384 or P-521.
 func NewPublicKey(key interface{}) (PublicKey, error) {
 	switch key := key.(type) {
 	case *rsa.PublicKey:
@@ -735,8 +651,6 @@ func NewPublicKey(key interface{}) (PublicKey, error) {
 		return (*ecdsaPublicKey)(key), nil
 	case *dsa.PublicKey:
 		return (*dsaPublicKey)(key), nil
-	case ed25519.PublicKey:
-		return (ed25519PublicKey)(key), nil
 	default:
 		return nil, fmt.Errorf("ssh: unsupported key type %T", key)
 	}
@@ -753,14 +667,6 @@ func ParsePrivateKey(pemBytes []byte) (Signer, error) {
 	return NewSignerFromKey(key)
 }
 
-// encryptedBlock tells whether a private key is
-// encrypted by examining its Proc-Type header
-// for a mention of ENCRYPTED
-// according to RFC 1421 Section 4.6.1.1.
-func encryptedBlock(block *pem.Block) bool {
-	return strings.Contains(block.Headers["Proc-Type"], "ENCRYPTED")
-}
-
 // ParseRawPrivateKey returns a private key from a PEM encoded private key. It
 // supports RSA (PKCS#1), DSA (OpenSSL), and ECDSA private keys.
 func ParseRawPrivateKey(pemBytes []byte) (interface{}, error) {
@@ -769,10 +675,6 @@ func ParseRawPrivateKey(pemBytes []byte) (interface{}, error) {
 		return nil, errors.New("ssh: no key found")
 	}
 
-	if encryptedBlock(block) {
-		return nil, errors.New("ssh: cannot decode encrypted private keys")
-	}
-
 	switch block.Type {
 	case "RSA PRIVATE KEY":
 		return x509.ParsePKCS1PrivateKey(block.Bytes)
@@ -780,8 +682,6 @@ func ParseRawPrivateKey(pemBytes []byte) (interface{}, error) {
 		return x509.ParseECPrivateKey(block.Bytes)
 	case "DSA PRIVATE KEY":
 		return ParseDSAPrivateKey(block.Bytes)
-	case "OPENSSH PRIVATE KEY":
-		return parseOpenSSHPrivateKey(block.Bytes)
 	default:
 		return nil, fmt.Errorf("ssh: unsupported key type %q", block.Type)
 	}
@@ -818,63 +718,3 @@ func ParseDSAPrivateKey(der []byte) (*dsa.PrivateKey, error) {
 		X: k.Pub,
 	}, nil
 }
-
-// Implemented based on the documentation at
-// https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.key
-func parseOpenSSHPrivateKey(key []byte) (*ed25519.PrivateKey, error) {
-	magic := append([]byte("openssh-key-v1"), 0)
-	if !bytes.Equal(magic, key[0:len(magic)]) {
-		return nil, errors.New("ssh: invalid openssh private key format")
-	}
-	remaining := key[len(magic):]
-
-	var w struct {
-		CipherName   string
-		KdfName      string
-		KdfOpts      string
-		NumKeys      uint32
-		PubKey       []byte
-		PrivKeyBlock []byte
-	}
-
-	if err := Unmarshal(remaining, &w); err != nil {
-		return nil, err
-	}
-
-	pk1 := struct {
-		Check1  uint32
-		Check2  uint32
-		Keytype string
-		Pub     []byte
-		Priv    []byte
-		Comment string
-		Pad     []byte `ssh:"rest"`
-	}{}
-
-	if err := Unmarshal(w.PrivKeyBlock, &pk1); err != nil {
-		return nil, err
-	}
-
-	if pk1.Check1 != pk1.Check2 {
-		return nil, errors.New("ssh: checkint mismatch")
-	}
-
-	// we only handle ed25519 keys currently
-	if pk1.Keytype != KeyAlgoED25519 {
-		return nil, errors.New("ssh: unhandled key type")
-	}
-
-	for i, b := range pk1.Pad {
-		if int(b) != i+1 {
-			return nil, errors.New("ssh: padding not as expected")
-		}
-	}
-
-	if len(pk1.Priv) != ed25519.PrivateKeySize {
-		return nil, errors.New("ssh: private key unexpected length")
-	}
-
-	pk := ed25519.PrivateKey(make([]byte, ed25519.PrivateKeySize))
-	copy(pk, pk1.Priv)
-	return &pk, nil
-}

vendor/golang.org/x/crypto/ssh/messages.go

@@ -13,7 +13,6 @@ import (
 	"math/big"
 	"reflect"
 	"strconv"
-	"strings"
 )
 
 // These are SSH message type numbers. They are scattered around several
@@ -48,7 +47,7 @@ type disconnectMsg struct {
 }
 
 func (d *disconnectMsg) Error() string {
-	return fmt.Sprintf("ssh: disconnect, reason %d: %s", d.Reason, d.Message)
+	return fmt.Sprintf("ssh: disconnect reason %d: %s", d.Reason, d.Message)
 }
 
 // See RFC 4253, section 7.1.
@@ -125,10 +124,6 @@ type userAuthRequestMsg struct {
 	Payload []byte `ssh:"rest"`
 }
 
-// Used for debug printouts of packets.
-type userAuthSuccessMsg struct {
-}
-
 // See RFC 4252, section 5.1
 const msgUserAuthFailure = 51
 
@@ -163,13 +158,6 @@ type channelOpenMsg struct {
 const msgChannelExtendedData = 95
 const msgChannelData = 94
 
-// Used for debug print outs of packets.
-type channelDataMsg struct {
-	PeersId uint32 `sshtype:"94"`
-	Length  uint32
-	Rest    []byte `ssh:"rest"`
-}
-
 // See RFC 4254, section 5.1.
 const msgChannelOpenConfirm = 91
 
@@ -267,19 +255,17 @@ type userAuthPubKeyOkMsg struct {
 	PubKey []byte
 }
 
-// typeTags returns the possible type bytes for the given reflect.Type, which
-// should be a struct. The possible values are separated by a '|' character.
-func typeTags(structType reflect.Type) (tags []byte) {
-	tagStr := structType.Field(0).Tag.Get("sshtype")
-
-	for _, tag := range strings.Split(tagStr, "|") {
-		i, err := strconv.Atoi(tag)
-		if err == nil {
-			tags = append(tags, byte(i))
-		}
+// typeTag returns the type byte for the given type. The type should
+// be struct.
+func typeTag(structType reflect.Type) byte {
+	var tag byte
+	var tagStr string
+	tagStr = structType.Field(0).Tag.Get("sshtype")
+	i, err := strconv.Atoi(tagStr)
+	if err == nil {
+		tag = byte(i)
 	}
-
-	return tags
+	return tag
 }
 
 func fieldError(t reflect.Type, field int, problem string) error {
@@ -293,34 +279,19 @@ var errShortRead = errors.New("ssh: short read")
 
 // Unmarshal parses data in SSH wire format into a structure. The out
 // argument should be a pointer to struct. If the first member of the
-// struct has the "sshtype" tag set to a '|'-separated set of numbers
-// in decimal, the packet must start with one of those numbers. In
-// case of error, Unmarshal returns a ParseError or
-// UnexpectedMessageError.
+// struct has the "sshtype" tag set to a number in decimal, the packet
+// must start that number.  In case of error, Unmarshal returns a
+// ParseError or UnexpectedMessageError.
 func Unmarshal(data []byte, out interface{}) error {
 	v := reflect.ValueOf(out).Elem()
 	structType := v.Type()
-	expectedTypes := typeTags(structType)
-
-	var expectedType byte
-	if len(expectedTypes) > 0 {
-		expectedType = expectedTypes[0]
-	}
-
+	expectedType := typeTag(structType)
 	if len(data) == 0 {
 		return parseError(expectedType)
 	}
-
-	if len(expectedTypes) > 0 {
-		goodType := false
-		for _, e := range expectedTypes {
-			if e > 0 && data[0] == e {
-				goodType = true
-				break
-			}
-		}
-		if !goodType {
-			return fmt.Errorf("ssh: unexpected message type %d (expected one of %v)", data[0], expectedTypes)
+	if expectedType > 0 {
+		if data[0] != expectedType {
+			return unexpectedMessageError(expectedType, data[0])
 		}
 		data = data[1:]
 	}
@@ -404,7 +375,7 @@ func Unmarshal(data []byte, out interface{}) error {
 				return fieldError(structType, i, "pointer to unsupported type")
 			}
 		default:
-			return fieldError(structType, i, fmt.Sprintf("unsupported type: %v", t))
+			return fieldError(structType, i, "unsupported type")
 		}
 	}
 
@@ -427,9 +398,9 @@ func Marshal(msg interface{}) []byte {
 
 func marshalStruct(out []byte, msg interface{}) []byte {
 	v := reflect.Indirect(reflect.ValueOf(msg))
-	msgTypes := typeTags(v.Type())
-	if len(msgTypes) > 0 {
-		out = append(out, msgTypes[0])
+	msgType := typeTag(v.Type())
+	if msgType > 0 {
+		out = append(out, msgType)
 	}
 
 	for i, n := 0, v.NumField(); i < n; i++ {
@@ -716,8 +687,6 @@ func decode(packet []byte) (interface{}, error) {
 		msg = new(kexDHReplyMsg)
 	case msgUserAuthRequest:
 		msg = new(userAuthRequestMsg)
-	case msgUserAuthSuccess:
-		return new(userAuthSuccessMsg), nil
 	case msgUserAuthFailure:
 		msg = new(userAuthFailureMsg)
 	case msgUserAuthPubKeyOk:
@@ -730,8 +699,6 @@ func decode(packet []byte) (interface{}, error) {
 		msg = new(globalRequestFailureMsg)
 	case msgChannelOpen:
 		msg = new(channelOpenMsg)
-	case msgChannelData:
-		msg = new(channelDataMsg)
 	case msgChannelOpenConfirm:
 		msg = new(channelOpenConfirmMsg)
 	case msgChannelOpenFailure:

vendor/golang.org/x/crypto/ssh/mux.go

@@ -131,9 +131,6 @@ func newMux(p packetConn) *mux {
 
 func (m *mux) sendMessage(msg interface{}) error {
 	p := Marshal(msg)
-	if debugMux {
-		log.Printf("send global(%d): %#v", m.chanList.offset, msg)
-	}
 	return m.conn.writePacket(p)
 }
 
@@ -178,6 +175,18 @@ func (m *mux) ackRequest(ok bool, data []byte) error {
 	return m.sendMessage(globalRequestFailureMsg{Data: data})
 }
 
+// TODO(hanwen): Disconnect is a transport layer message. We should
+// probably send and receive Disconnect somewhere in the transport
+// code.
+
+// Disconnect sends a disconnect message.
+func (m *mux) Disconnect(reason uint32, message string) error {
+	return m.sendMessage(disconnectMsg{
+		Reason:  reason,
+		Message: message,
+	})
+}
+
 func (m *mux) Close() error {
 	return m.conn.Close()
 }
@@ -227,6 +236,11 @@ func (m *mux) onePacket() error {
 	}
 
 	switch packet[0] {
+	case msgNewKeys:
+		// Ignore notification of key change.
+		return nil
+	case msgDisconnect:
+		return m.handleDisconnect(packet)
 	case msgChannelOpen:
 		return m.handleChannelOpen(packet)
 	case msgGlobalRequest, msgRequestSuccess, msgRequestFailure:
@@ -246,6 +260,18 @@ func (m *mux) onePacket() error {
 	return ch.handlePacket(packet)
 }
 
+func (m *mux) handleDisconnect(packet []byte) error {
+	var d disconnectMsg
+	if err := Unmarshal(packet, &d); err != nil {
+		return err
+	}
+
+	if debugMux {
+		log.Printf("caught disconnect: %v", d)
+	}
+	return &d
+}
+
 func (m *mux) handleGlobalPacket(packet []byte) error {
 	msg, err := decode(packet)
 	if err != nil {

vendor/golang.org/x/crypto/ssh/server.go

@@ -188,10 +188,16 @@ func (s *connection) serverHandshake(config *ServerConfig) (*Permissions, error)
 	tr := newTransport(s.sshConn.conn, config.Rand, false /* not client */)
 	s.transport = newServerTransport(tr, s.clientVersion, s.serverVersion, config)
 
-	if err := s.transport.requestInitialKeyChange(); err != nil {
+	if err := s.transport.requestKeyChange(); err != nil {
 		return nil, err
 	}
 
+	if packet, err := s.transport.readPacket(); err != nil {
+		return nil, err
+	} else if packet[0] != msgNewKeys {
+		return nil, unexpectedMessageError(msgNewKeys, packet[0])
+	}
+
 	// We just did the key change, so the session ID is established.
 	s.sessionID = s.transport.getSessionID()
 
@@ -224,7 +230,7 @@ func (s *connection) serverHandshake(config *ServerConfig) (*Permissions, error)
 
 func isAcceptableAlgo(algo string) bool {
 	switch algo {
-	case KeyAlgoRSA, KeyAlgoDSA, KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521, KeyAlgoED25519,
+	case KeyAlgoRSA, KeyAlgoDSA, KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521,
 		CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01:
 		return true
 	}
@@ -284,6 +290,7 @@ userAuthLoop:
 		switch userAuthReq.Method {
 		case "none":
 			if config.NoClientAuth {
+				s.user = ""
 				authErr = nil
 			}
 		case "password":

vendor/golang.org/x/crypto/ssh/session.go

@@ -9,7 +9,6 @@ package ssh
 
 import (
 	"bytes"
-	"encoding/binary"
 	"errors"
 	"fmt"
 	"io"
@@ -282,10 +281,9 @@ func (s *Session) Start(cmd string) error {
 // copying stdin, stdout, and stderr, and exits with a zero exit
 // status.
 //
-// If the remote server does not send an exit status, an error of type
-// *ExitMissingError is returned. If the command completes
-// unsuccessfully or is interrupted by a signal, the error is of type
-// *ExitError. Other error types may be returned for I/O problems.
+// If the command fails to run or doesn't complete successfully, the
+// error is of type *ExitError. Other error types may be
+// returned for I/O problems.
 func (s *Session) Run(cmd string) error {
 	err := s.Start(cmd)
 	if err != nil {
@@ -372,10 +370,9 @@ func (s *Session) start() error {
 // copying stdin, stdout, and stderr, and exits with a zero exit
 // status.
 //
-// If the remote server does not send an exit status, an error of type
-// *ExitMissingError is returned. If the command completes
-// unsuccessfully or is interrupted by a signal, the error is of type
-// *ExitError. Other error types may be returned for I/O problems.
+// If the command fails to run or doesn't complete successfully, the
+// error is of type *ExitError. Other error types may be
+// returned for I/O problems.
 func (s *Session) Wait() error {
 	if !s.started {
 		return errors.New("ssh: session not started")
@@ -403,7 +400,8 @@ func (s *Session) wait(reqs <-chan *Request) error {
 	for msg := range reqs {
 		switch msg.Type {
 		case "exit-status":
-			wm.status = int(binary.BigEndian.Uint32(msg.Payload))
+			d := msg.Payload
+			wm.status = int(d[0])<<24 | int(d[1])<<16 | int(d[2])<<8 | int(d[3])
 		case "exit-signal":
 			var sigval struct {
 				Signal     string
@@ -433,29 +431,16 @@ func (s *Session) wait(reqs <-chan *Request) error {
 	if wm.status == -1 {
 		// exit-status was never sent from server
 		if wm.signal == "" {
-			// signal was not sent either.  RFC 4254
-			// section 6.10 recommends against this
-			// behavior, but it is allowed, so we let
-			// clients handle it.
-			return &ExitMissingError{}
+			return errors.New("wait: remote command exited without exit status or exit signal")
 		}
 		wm.status = 128
 		if _, ok := signals[Signal(wm.signal)]; ok {
 			wm.status += signals[Signal(wm.signal)]
 		}
 	}
-
 	return &ExitError{wm}
 }
 
-// ExitMissingError is returned if a session is torn down cleanly, but
-// the server sends no confirmation of the exit status.
-type ExitMissingError struct{}
-
-func (e *ExitMissingError) Error() string {
-	return "wait: remote command exited without exit status or exit signal"
-}
-
 func (s *Session) stdin() {
 	if s.stdinpipe {
 		return
@@ -616,12 +601,5 @@ func (w Waitmsg) Lang() string {
 }
 
 func (w Waitmsg) String() string {
-	str := fmt.Sprintf("Process exited with status %v", w.status)
-	if w.signal != "" {
-		str += fmt.Sprintf(" from signal %v", w.signal)
-	}
-	if w.msg != "" {
-		str += fmt.Sprintf(". Reason was: %v", w.msg)
-	}
-	return str
+	return fmt.Sprintf("Process exited with: %v. Reason was: %v (%v)", w.status, w.msg, w.signal)
 }

vendor/golang.org/x/crypto/ssh/transport.go

@@ -11,9 +11,8 @@ import (
 )
 
 const (
-	gcmCipherID    = "aes128-gcm@openssh.com"
-	aes128cbcID    = "aes128-cbc"
-	tripledescbcID = "3des-cbc"
+	gcmCipherID = "aes128-gcm@openssh.com"
+	aes128cbcID = "aes128-cbc"
 )
 
 // packetConn represents a transport that implements packet based
@@ -40,6 +39,19 @@ type transport struct {
 	rand      io.Reader
 
 	io.Closer
+
+	// Initial H used for the session ID. Once assigned this does
+	// not change, even during subsequent key exchanges.
+	sessionID []byte
+}
+
+// getSessionID returns the ID of the SSH connection. The return value
+// should not be modified.
+func (t *transport) getSessionID() []byte {
+	if t.sessionID == nil {
+		panic("session ID not set yet")
+	}
+	return t.sessionID
 }
 
 // packetCipher represents a combination of SSH encryption/MAC
@@ -69,6 +81,12 @@ type connectionState struct {
 // both directions are triggered by reading and writing a msgNewKey packet
 // respectively.
 func (t *transport) prepareKeyChange(algs *algorithms, kexResult *kexResult) error {
+	if t.sessionID == nil {
+		t.sessionID = kexResult.H
+	}
+
+	kexResult.SessionID = t.sessionID
+
 	if ciph, err := newPacketCipher(t.reader.dir, algs.r, kexResult); err != nil {
 		return err
 	} else {
@@ -96,27 +114,12 @@ func (s *connectionState) readPacket(r *bufio.Reader) ([]byte, error) {
 		err = errors.New("ssh: zero length packet")
 	}
 
-	if len(packet) > 0 {
-		switch packet[0] {
-		case msgNewKeys:
-			select {
-			case cipher := <-s.pendingKeyChange:
-				s.packetCipher = cipher
-			default:
-				return nil, errors.New("ssh: got bogus newkeys message.")
-			}
-
-		case msgDisconnect:
-			// Transform a disconnect message into an
-			// error. Since this is lowest level at which
-			// we interpret message types, doing it here
-			// ensures that we don't have to handle it
-			// elsewhere.
-			var msg disconnectMsg
-			if err := Unmarshal(packet, &msg); err != nil {
-				return nil, err
-			}
-			return nil, &msg
+	if len(packet) > 0 && packet[0] == msgNewKeys {
+		select {
+		case cipher := <-s.pendingKeyChange:
+			s.packetCipher = cipher
+		default:
+			return nil, errors.New("ssh: got bogus newkeys message.")
 		}
 	}
 
@@ -220,10 +223,6 @@ func newPacketCipher(d direction, algs directionAlgorithms, kex *kexResult) (pac
 		return newAESCBCCipher(iv, key, macKey, algs)
 	}
 
-	if algs.Cipher == tripledescbcID {
-		return newTripleDESCBCCipher(iv, key, macKey, algs)
-	}
-
 	c := &streamPacketCipher{
 		mac: macModes[algs.MAC].new(macKey),
 	}

vendor/vendor.json

@@ -2181,46 +2181,16 @@
 			"revisionTime": "2016-10-04T18:54:04Z"
 		},
 		{
-			"checksumSHA1": "9x64JhJGo6z8TS0Q33cGcR64kjA=",
 			"path": "golang.org/x/crypto/curve25519",
-			"revision": "ca7e7f10cb9fd9c1a6ff7f60436c086d73714180",
-			"revisionTime": "2016-10-25T12:52:55Z"
+			"revision": "1f22c0103821b9390939b6776727195525381532"
 		},
 		{
-			"checksumSHA1": "wGb//LjBPNxYHqk+dcLo7BjPXK8=",
-			"path": "golang.org/x/crypto/ed25519",
-			"revision": "ca7e7f10cb9fd9c1a6ff7f60436c086d73714180",
-			"revisionTime": "2016-10-25T12:52:55Z"
-		},
-		{
-			"checksumSHA1": "LXFcVx8I587SnWmKycSDEq9yvK8=",
-			"path": "golang.org/x/crypto/ed25519/internal/edwards25519",
-			"revision": "ca7e7f10cb9fd9c1a6ff7f60436c086d73714180",
-			"revisionTime": "2016-10-25T12:52:55Z"
-		},
-		{
-			"checksumSHA1": "KeaQhXgb4KlZWJM7aIgcJwCKNOg=",
-			"path": "golang.org/x/crypto/pkcs12",
-			"revision": "ca7e7f10cb9fd9c1a6ff7f60436c086d73714180",
-			"revisionTime": "2016-10-25T12:52:55Z"
-		},
-		{
-			"checksumSHA1": "iVJcif9M9uefvvqHCNR9VQrjc/s=",
-			"path": "golang.org/x/crypto/pkcs12/internal/rc2",
-			"revision": "ca7e7f10cb9fd9c1a6ff7f60436c086d73714180",
-			"revisionTime": "2016-10-25T12:52:55Z"
-		},
-		{
-			"checksumSHA1": "LlElMHeTC34ng8eHzjvtUhAgrr8=",
 			"path": "golang.org/x/crypto/ssh",
-			"revision": "ca7e7f10cb9fd9c1a6ff7f60436c086d73714180",
-			"revisionTime": "2016-10-25T12:52:55Z"
+			"revision": "1f22c0103821b9390939b6776727195525381532"
 		},
 		{
-			"checksumSHA1": "SJ3Ma3Ozavxpbh1usZWBCnzMKIc=",
 			"path": "golang.org/x/crypto/ssh/agent",
-			"revision": "ca7e7f10cb9fd9c1a6ff7f60436c086d73714180",
-			"revisionTime": "2016-10-25T12:52:55Z"
+			"revision": "1f22c0103821b9390939b6776727195525381532"
 		},
 		{
 			"path": "golang.org/x/net/context",