{{{#!php
<?php
function hmac_sha1($key,$data) {
    $blocksize=64;
    $hashfunc='sha1';
    if (strlen($key)>$blocksize)
        $key=pack('H*', $hashfunc($key));
    $key=str_pad($key,$blocksize,chr(0x00));
    $ipad=str_repeat(chr(0x36),$blocksize);
    $opad=str_repeat(chr(0x5c),$blocksize);
    $hmac = pack(
                'H*',$hashfunc(
                    ($key^$opad).pack(
                        'H*',$hashfunc(
                            ($key^$ipad).$data
                        )
                    )
                )
            );
    return bin2hex($hmac);
}

$hmac=hmac_sha1('key','The quick brown fox jumps over the lazy dog');
print "= ".$hmac;
}
?>
}}}
----
{{{
= de7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9
}}}