PHP Extension

HMAC SHA-1 Matching FIPS Examples

See more Encryption Examples

Provides an example of computing an HMAC-SHA1 digest to duplicate the FIPS examples at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf PHP Extension

<?php

include("chilkat.php");

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

$crypt = new CkCrypt2();

$strToSign = 'Sample #1';

// 64-byte key
$key = '000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f';

// The expected result:
// (from Appendix A.1 at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf )
$expectedResult = '4f4ca3d5d68ba7cc0a1208c9c61e9c5da0403c0a';

// Here is the code to duplicate the results:
$crypt->put_HashAlgorithm('sha-1');
$crypt->put_EncodingMode('hex');
$crypt->put_MacAlgorithm('hmac');

$crypt->SetMacKeyEncoded($key,'hex');

$mac = $crypt->macStringENC($strToSign);

print 'Computed: ' . $mac . "\n";
print 'Expected: ' . $expectedResult . "\n";

?>