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Co-authored-by: Tu Nguyen <im2nguyen@users.noreply.github.com>
Co-authored-by: trujillo-adam <47586768+trujillo-adam@users.noreply.github.com>
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---
page_title: filesha1 - Functions - Configuration Language
description: he filesha1 function computes the SHA1 hash of the contents of a given file and encodes it as hex.
description: The filesha1 function computes the SHA1 hash of the contents of a given file and encodes it as hex.
---
# `filesha1` function reference
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The `filesha1` is a variant of [`sha1`](/terraform/language/functions/sha1) that hashes the contents of a given file rather than a literal string.
This is similar to `sha1(file(filename))`, but
because [`file`](/terraform/language/functions/file) accepts only UTF-8 text it cannot be used to
create hashes for binary files.
Use the `filesha1` function instead of wrapping the `file` function in a `sha1` function, for example `sha1(file(filename))`, because [`file`](/terraform/language/functions/file) accepts only UTF-8 text. As a result, you cannot use `sha1(file(filename))` to create hashes for binary files.
!> **Security warning**: Collision attacks have been successfully performed against this hashing function. Before using this function for anything security-sensitive, review relevant literature to understand the security implications.
!> **Security warning**: This hashing function is susceptible to collision attacks. Before using this function for anything security-sensitive, review relevant literature to understand the security implications.
## Syntax

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