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check signature

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This commit is contained in:
Paul Chen 2008-09-23 07:12:42 +00:00
parent c9e5de4d7b
commit 796b83c972
1 changed files with 22 additions and 3 deletions
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25
verifyOTP.php
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@ -55,6 +55,27 @@ $k = b64ToModhex($ad['secret']);
//debug('aes key in modhex = '.$k);
$key16 = ModHex::Decode($k);
//debug('aes key in hex = ['.$key16.'], length = '.strlen($key16));
$apiKey = base64_decode($ad['c_secret']);
//// Check signature
//
if ($ad['chk_sig']) {
// Create the signature using the API key
$reqParams = 'id='.$client.'&otp='.$otp;
$hmac = hash_hmac('sha1', utf8_encode($reqParams), $apiKey, true);
$hmac = base64_encode($hmac);
if (($h = getHttpVal('h', '')) == '') {
sendResp(S_MISSING_PARAMETER, 'h');
debug('signature missing, hmac='.$hmac);
exit;
} else if ($hmac != $h) {
sendResp(S_BAD_SIGNATURE);
debug('h='.$h.', hmac='.$hmac);
exit;
}
}
//// Decode OTP from input
//
@ -152,7 +173,7 @@ if (updDB($ad['id'], $decoded_token)) {
//////////////////////////
function sendResp($status, $info=null) {
global $ad;
global $ad, $apiKey;
if ($status == null) {
$status = S_BACKEND_ERROR;
@ -167,14 +188,12 @@ function sendResp($status, $info=null) {
// Generate the signature
debug('API key: '.$ad['c_secret']); // API key of the client
$apiKey = base64_decode($ad['c_secret']);
debug('Signing: '.$respParams);
// the TRUE at the end states we want the raw value, not hexadecimal form
$hmac = hash_hmac('sha1', utf8_encode($respParams), $apiKey, true);
//outputToFile('hmac', $hmac, "b");
// now take that byte value and base64 encode it
$hmac = base64_encode($hmac);
debug('h: '.$hmac);
echo 'h='.$hmac.PHP_EOL;
echo 't='.$timestamp.PHP_EOL;