(PHP Extension) HMAC Hex String

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

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

$crypt = new CkCrypt2();

$success = $crypt->UnlockComponent('Anything for 30-day trial');
if ($success != true) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

//  Set the MAC algorithm to HMAC
$crypt->put_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', ...)
$keyHex = '41C21CB9D7A02FC5D4FADB9E4755B9DE';
$success = $crypt->SetMacKeyEncoded($keyHex,'hex');

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

//  We'll need to decode the hex to binary:
$bd = new CkBinData();
$bd->AppendEncoded($dataHex,'hex');

//  Do the HMAC-SHA256 hash and return as a hex string:
$crypt->put_EncodingMode('hex');
$crypt->put_HashAlgorithm('sha-256');
$macHex = $crypt->macBdENC($bd);
print $macHex . "\n";

?>