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Important: This documentation is about an older version. It's relevant only to the release noted, many of the features and functions have been updated or replaced. Please view the current version.

DocumentationGrafana k6JavaScript APIk6/cryptohmac( algorithm, secret, data, outputEncoding )
Open source

hmac( algorithm, secret, data, outputEncoding )

Note

A module with a better and standard API exists.

The new k6/experimental/webcrypto API partially implements the WebCryptoAPI, supporting more features than k6/crypto.

Use HMAC to sign a piece of data using a shared secret.

ParameterTypeDescription
algorithmstringThe hashing algorithm to use. One of md4, md5, sha1, sha256, sha384, sha512, sha512_224, sha512_256 or ripemd160.
secretstring / ArrayBufferA shared secret used to sign the data.
datastring / ArrayBufferThe data to sign.
outputEncodingstringDescribes the type of encoding to use for the hash value. Can be “base64”, “base64url”, “base64rawurl”, “hex” or “binary”.

Returns

TypeDescription
string / ArrayThe hash digest as string (for “base64”, “base64url”, “base64rawurl”, “hex” outputEncoding) or raw array of integers (for “binary” outputEncoding).

Example

JavaScript 
import crypto from 'k6/crypto';

export default function () {
  let hash = crypto.hmac('sha256', 'mysecret', 'hello world!', 'hex');
  console.log(hash);
  const binArray = [104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100, 33];
  hash = crypto.hmac('sha256', 'mysecret', new Uint8Array(binArray).buffer, 'hex');
  console.log(hash);
}

The above script should result in the following being printed during execution:

bash 
INFO[0000] 893a72d8cab129e5ba85aea4599fd53f59bfe652cff4098a3780313228d8c20f
INFO[0000] 893a72d8cab129e5ba85aea4599fd53f59bfe652cff4098a3780313228d8c20f