Digest.php in Commerce Braintree 7

File

braintree_php/lib/Braintree/Digest.php

<?php

/**
 * Digest encryption module
 *
 * @copyright  2010 Braintree Payment Solutions
 */

/**
 * Digest creates an HMAC-SHA1 hash for encrypting messages
 *
 * @copyright  2010 Braintree Payment Solutions
 */
class Braintree_Digest {
  public static function hexDigest($string) {
    if (function_exists('hash_hmac')) {
      return self::_builtInHmacSha1($string, Braintree_Configuration::privateKey());
    }
    else {
      return self::_hmacSha1($string, Braintree_Configuration::privateKey());
    }
  }
  public static function secureCompare($left, $right) {
    if (strlen($left) != strlen($right)) {
      return false;
    }
    $leftBytes = unpack("C*", $left);
    $rightBytes = unpack("C*", $right);
    $result = 0;
    for ($i = 0; $i < strlen($left); $i++) {
      $result = $result | $left[$i] ^ $right[$i];
    }
    return $result == 0;
  }
  public static function _builtInHmacSha1($message, $key) {
    return hash_hmac('sha1', $message, sha1(Braintree_Configuration::privateKey(), true));
  }
  public static function _hmacSha1($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)));
  }

}

Classes

Name	Description
Braintree_Digest	Digest creates an HMAC-SHA1 hash for encrypting messages