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---
title: hmac
linktitle: hmac
description: Returns a cryptographic hash that uses a key to sign a message.
date: 2020-05-29
publishdate: 2020-05-29
lastmod: 2020-05-29
categories: [functions]
menu:
docs:
parent: "functions"
keywords: [hmac,checksum]
signature: ["crypto.HMAC HASH_TYPE KEY MESSAGE [ENCODING]","hmac HASH_TYPE KEY MESSAGE [ENCODING]" ]
workson: []
hugoversion:
relatedfuncs: [hmac]
deprecated: false
aliases: []
---
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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