---
title: "k6/crypto | Grafana k6 documentation"
description: "The k6/crypto module provides common hashing functionality available in the GoLang crypto."
---

# k6/crypto

> Note
> 
> A module with a better and standard API exists.
> 
> The [crypto module](/docs/k6/latest/javascript-api/crypto/) partially implements the [WebCrypto API](https://www.w3.org/TR/WebCryptoAPI/), supporting more features than [k6/crypto](/docs/k6/latest/javascript-api/k6-crypto/).

The [`k6/crypto` module](/docs/k6/latest/javascript-api/k6-crypto/) provides common hashing functionality available in the GoLang [crypto](https://golang.org/pkg/crypto/) package.

Expand table

| Function                                                                                        | Description                                                                                                                  |
|-------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------|
| [createHash(algorithm)](/docs/k6/latest/javascript-api/k6-crypto/createhash/)                   | Create a Hasher object, allowing the user to add data to hash multiple times, and extract hash digests along the way.        |
| [createHMAC(algorithm, secret)](/docs/k6/latest/javascript-api/k6-crypto/createhmac/)           | Create an HMAC hashing object, allowing the user to add data to hash multiple times, and extract hash digests along the way. |
| [hmac(algorithm, secret, data, outputEncoding)](/docs/k6/latest/javascript-api/k6-crypto/hmac/) | Use HMAC to sign an input string.                                                                                            |
| [md4(input, outputEncoding)](/docs/k6/latest/javascript-api/k6-crypto/md4/)                     | Use MD4 to hash an input string.                                                                                             |
| [md5(input, outputEncoding)](/docs/k6/latest/javascript-api/k6-crypto/md5/)                     | Use MD5 to hash an input string.                                                                                             |
| [randomBytes(int)](/docs/k6/latest/javascript-api/k6-crypto/randombytes/)                       | Return an array with a number of cryptographically random bytes.                                                             |
| [ripemd160(input, outputEncoding)](/docs/k6/latest/javascript-api/k6-crypto/ripemd160/)         | Use RIPEMD-160 to hash an input string.                                                                                      |
| [sha1(input, outputEncoding)](/docs/k6/latest/javascript-api/k6-crypto/sha1/)                   | Use SHA-1 to hash an input string.                                                                                           |
| [sha256(input, outputEncoding)](/docs/k6/latest/javascript-api/k6-crypto/sha256/)               | Use SHA-256 to hash an input string.                                                                                         |
| [sha384(input, outputEncoding)](/docs/k6/latest/javascript-api/k6-crypto/sha384/)               | Use SHA-384 to hash an input string.                                                                                         |
| [sha512(input, outputEncoding)](/docs/k6/latest/javascript-api/k6-crypto/sha512/)               | Use SHA-512 to hash an input string.                                                                                         |
| [sha512\_224(input, outputEncoding)](/docs/k6/latest/javascript-api/k6-crypto/sha512_224/)      | Use SHA-512/224 to hash an input string.                                                                                     |
| [sha512\_256(input, outputEncoding)](/docs/k6/latest/javascript-api/k6-crypto/sha512_256/)      | Use SHA-512/256 to hash an input string.                                                                                     |

Expand table

| Class                                                      | Description                                                                                                                                                                   |
|------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [Hasher](/docs/k6/latest/javascript-api/k6-crypto/hasher/) | Object returned by [crypto.createHash()](/docs/k6/latest/javascript-api/k6-crypto/createhash/). It allows adding more data to be hashed and to extract digests along the way. |