---
url: /process-functions/security-sha1hmac.md
description: Generate a SHA1 HMAC hash.
---

# security.sha1hmac

Generate a SHA1 HMAC hash.

```js
security.sha1hmac(key, str);
```

#### Parameters

* `key` - A secret key (string).
* `str` - The string to hash.

```js
let hash = security.sha1hmac("mySecret", "Hello"); // "YuM0lx19wbPh15dGIJ0q/9EG7RI="
```