computeHmac

function computeHmac(
   algorithm, 
   _key, 
   _data): string

key = id('some-secret');

// Compute the HMAC
computeHmac('sha256', key, '0x1337');

// To compute the HMAC of UTF-8 data, the data must be
// converted to UTF-8 bytes
computeHmac('sha256', key, toUtf8Bytes('Hello World'));