HMAC SHA-1 Matching FIPS 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

Download Chilkat Crypt ActiveX

<?php

$crypt = new COM("Chilkat.Crypt2");

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

$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->HashAlgorithm = 'sha-1';
$crypt->EncodingMode = 'hex';

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

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

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

?>