38 lines
1.2 KiB
Markdown
38 lines
1.2 KiB
Markdown
---
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layout: "functions"
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page_title: "sha1 - Functions - Configuration Language"
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sidebar_current: "docs-funcs-crypto-sha1"
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description: |-
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The sha1 function computes the SHA1 hash of a given string and encodes it
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with hexadecimal digits.
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---
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# `sha1` Function
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-> **Note:** This page is about Terraform 0.12 and later. For Terraform 0.11 and
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earlier, see
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[0.11 Configuration Language: Interpolation Syntax](../../configuration-0-11/interpolation.html).
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`sha1` computes the SHA1 hash of a given string and encodes it with
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hexadecimal digits.
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The given string is first encoded as UTF-8 and then the SHA1 algorithm is applied
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as defined in [RFC 3174](https://tools.ietf.org/html/rfc3174). The raw hash is
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then encoded to lowercase hexadecimal digits before returning.
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Collision attacks have been successfully performed against this hashing
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function. Before using this function for anything security-sensitive, review
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relevant literature to understand the security implications.
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## Examples
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```
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> sha1("hello world")
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2aae6c35c94fcfb415dbe95f408b9ce91ee846ed
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```
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## Related Functions
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* [`filesha1`](./filesha1.html) calculates the same hash from
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the contents of a file rather than from a string value.
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