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Complete my HMAC decryption in PHP -- 2

We are looking for a PHP version of the google HMAC encrypt method described in this link

[url removed, login to view]

Our supplier deliverd some keys to test the algorytm.

e_key = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

i_key = bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

data = qMgSYozqy_iTLthA_kqjsm_Y7PlGcHiO4UU9aw==

I wrote a piece of code, but i can't find the answer why it is not working. Probably the php base64 encoding algorithm in PHP is not supporting RFC 3548.

When the method is implemented correctly the result has to be a number with decimals. When i execute my method with the above data the output is gibberish.

We’re looking for a work-around.

Hereby our code

//[url removed, login to view]

function hmacEncrypt($price, $iv, $e_key, $i_key) {

$pad = substr(hash_hmac('sha1', $iv, $e_key), 0, 8);

$enc_price = $pad ^ $price;

$signature = substr(hash_hmac('sha1', $price . $iv, $i_key), 0, 4);

$final_message = base64_encode($iv . $enc_price . $signature);

return $final_message;


function hmacDecrypt($final_message, $e_key, $i_key) {

//$enc_price = base64_decode($final_message);

$enc_price = base64_decode($final_message, 16);

$iv = substr($enc_price, 0, 16);

$signature = substr($enc_price, strlen($enc_price) - 4, 4);

$p = substr($enc_price, 16, 8);

$price_pad = substr(hash_hmac('sha1', $iv, $e_key), 0, 8);

$price = $p ^ $price_pad;

$conf_sig = substr(hash_hmac('sha1', $price . $iv, $i_key), 0, 4);

return $price;

if ($conf_sig === $signature) {

return floatval($price);



echo hmacDecrypt('qMgSYozqy_iTLthA_kqjsm_Y7PlGcHiO4UU9aw==', 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa', 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb');

Fähigkeiten: PHP, Softwarearchitektur

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Projekt-ID: #7784881

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