(Node.js) HMAC Hex String

Demonstrates how to compute an HMAC using a hexidecimal key and data.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var crypt = new chilkat.Crypt2();

    // Set the MAC algorithm to HMAC
    crypt.MacAlgorithm = "hmac";

    // Our HMAC key will be the bytes represented in the following hex string.
    // In other words, the HMAC key is composed of the bytes 0x41, 0xC2, 0x1C, ...
    // (It is not composed of the us-ascii string '4', '1', 'C', ...)
    var keyHex = "41C21CB9D7A02FC5D4FADB9E4755B9DE";
    var success = crypt.SetMacKeyEncoded(keyHex,"hex");

    // Our desire is to HMAC the bytes represented in the following string:
    var dataHex = "C22078065B01460001000000010062043BF5B18228C8E02D17BCFE4E00561FA6DEC216EA97195CEB579942E275C21932258E3CD391E507FF4E7FD4C787A8447DA111C54A9C1795E7FF4C0BAA2EDA";

    // We'll need to decode the hex to binary:
    var bd = new chilkat.BinData();
    bd.AppendEncoded(dataHex,"hex");

    // Do the HMAC-SHA256 hash and return as a hex string:
    crypt.EncodingMode = "hex";
    crypt.HashAlgorithm = "sha-256";
    var macHex = crypt.MacBdENC(bd);
    console.log(macHex);

}

chilkatExample();