public static function Braintree_Digest::_hmacSha1 in Commerce Braintree 7

3 calls to Braintree_Digest::_hmacSha1()

Braintree_Digest::hexDigest in braintree_php/lib/Braintree/Digest.php

Braintree_DigestTest::testHmacSha1 in braintree_php/tests/unit/DigestTest.php

Braintree_DigestTest::testHmacSha1_again in braintree_php/tests/unit/DigestTest.php

File

braintree_php/lib/Braintree/Digest.php, line 45

Class

Braintree_Digest

Digest creates an HMAC-SHA1 hash for encrypting messages

Code

public static function _hmacSha1($message, $key) {
  $pack = 'H40';
  $keyDigest = sha1($key, true);
  $innerPad = str_repeat(chr(0x36), 64);
  $outerPad = str_repeat(chr(0x5c), 64);
  for ($i = 0; $i < 20; $i++) {
    $innerPad[$i] = $keyDigest[$i] ^ $innerPad[$i];
    $outerPad[$i] = $keyDigest[$i] ^ $outerPad[$i];
  }
  return sha1($outerPad . pack($pack, sha1($innerPad . $message)));
}