function drupal_hash_hmac_sha1 in Drupal 6

Calculates a hexadecimal encoded sha-1 hmac.

Parameters

string $data: String to be validated with the hmac.

string $key: A secret string key.

See RFC2104 (http://www.ietf.org/rfc/rfc2104.txt). Note, the result of this must be identical to using hash_hmac('sha1', $data, $key); We don't use that function since PHP can be missing it if it was compiled with the --disable-hash switch.

Return value

string A hexadecimal encoded sha-1 hmac.

1 call to drupal_hash_hmac_sha1()

drupal_hmac_base64 in includes/bootstrap.inc

Calculates a base-64 encoded, URL-safe sha-1 hmac.

File

includes/bootstrap.inc, line 1506

Functions that need to be loaded on every Drupal request.

Code

function drupal_hash_hmac_sha1($data, $key) {

  // Keys longer than the 64 byte block size must be hashed first.
  if (strlen($key) > 64) {
    $key = pack("H*", sha1($key));
  }
  return sha1((str_pad($key, 64, chr(0x0)) ^ str_repeat(chr(0x5c), 64)) . pack("H*", sha1((str_pad($key, 64, chr(0x0)) ^ str_repeat(chr(0x36), 64)) . $data)));
}