(PHP ActiveX) HMAC Hex String

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Crypt2')
$crypt = new COM("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', ...)
$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:
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData')
$bd = new COM("Chilkat.BinData");
$bd->AppendEncoded($dataHex,'hex');

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

?>