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---
title: crypto.HMAC
description: Returns a cryptographic hash that uses a key to sign a message.
categories: []
keywords: []
action:
aliases: [hmac]
related:
- functions/crypto/FNV32a
- functions/crypto/MD5
- functions/crypto/SHA1
- functions/crypto/SHA256
returnType: string
signatures: ['crypto.HMAC HASH_TYPE KEY MESSAGE [ENCODING]']
aliases: [/functions/hmac]
---
Set the `HASH_TYPE` argument to `md5`, `sha1`, `sha256`, or `sha512`.
Set the optional `ENCODING` argument to either `hex` (default) or `binary`.
```go-html-template
{{ hmac "sha256" "Secret key" "Secret message" }}
5cceb491f45f8b154e20f3b0a30ed3a6ff3027d373f85c78ffe8983180b03c84
{{ hmac "sha256" "Secret key" "Secret message" "hex" }}
5cceb491f45f8b154e20f3b0a30ed3a6ff3027d373f85c78ffe8983180b03c84
{{ hmac "sha256" "Secret key" "Secret message" "binary" | base64Encode }}
XM60kfRfixVOIPOwow7Tpv8wJ9Nz+Fx4/+iYMYCwPIQ=
```
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