hugo/docs/content/en/functions/crypto/HMAC.md
2023-10-20 09:43:56 +02:00

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---
title: crypto.HMAC
linkTitle: hmac
description: Returns a cryptographic hash that uses a key to sign a message.
categories: [functions]
keywords: []
menu:
docs:
parent: functions
function:
aliases: [hmac]
returnType: string
signatures: ['crypto.HMAC HASH_TYPE KEY MESSAGE [ENCODING]']
relatedFunctions:
- crypto.FNV32a
- crypto.HMAC
- crypto.MD5
- crypto.SHA1
- crypto.SHA256
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=
```