PHP Extension

AES-CMAC

See more Encryption Examples

Demonstrates using the AES-CMAC algorithm, which is a keyed hash function similar to HMAC and Poly1305.

Note: Chilkat added AES-CMAC in version 9.5.0.95.

PHP Extension

<?php

include("chilkat.php");

$success = false;

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

$crypt = new CkCrypt2();

// Set the MAC algorithm to AES-CMAC
$crypt->put_MacAlgorithm('aes-cmac');

// AES-CMAC always uses a 16-byte (128-bit) MAC key.
$keyHex = '2b7e151628aed2a6abf7158809cf4f3c';
$success = $crypt->SetMacKeyEncoded($keyHex,'hex');

// Let's compute the AES-CMAC for the test vector at https://www.rfc-editor.org/rfc/rfc4493#appendix-A
// Here we have 64 bytes in hex representation.
$messageBytes = '6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52eff69f2445df4f9b17ad2b417be66c3710';

$bd = new CkBinData();
$bd->AppendEncoded($messageBytes,'hex');

// Compute the AES-CMAC for the bytes contained in bd and return the AES-CMAC in hex representation.
$crypt->put_EncodingMode('hex_lower');
$cmac = $crypt->macBdENC($bd);
print $cmac . "\n";
// Output should be: 51f0bebf7e3b9d92fc49741779363cfe

// Now do the same for a string:
$plainText = ''Twas brillig, and the slithy toves\nDid gyre and gimble in the wabe:\nAll mimsy were the borogoves,\nAnd the mome raths outgrabe.';
$encTag = $crypt->macStringENC($plainText);
print $encTag . "\n";

// Output should be: 4fca1fcbd265048d247f99ab57fa3ceb

?>