<?php class Foo { protected $mcrypt_cipher = MCRYPT_RIJNDAEL_128; protected $mcrypt_mode = MCRYPT_MODE_CBC;  public function decrypt($key, $iv, $encrypted)  {   $iv_utf = mb_convert_encoding($iv, 'UTF-8');   return mcrypt_decrypt($this->mcrypt_cipher, $key, base64_decode($encrypted), $this->mcrypt_mode, $iv_utf);  }    public function pbkdf2($algorithm, $password, $salt, $count, $key_length, $raw_output = false)  {  $algorithm = strtolower($algorithm);  if(!in_array($algorithm, hash_algos(), true))  die('PBKDF2 ERROR: Invalid hash algorithm.');  if($count <= 0 || $key_length <= 0)  die('PBKDF2 ERROR: Invalid parameters.');    $hash_length = strlen(hash($algorithm, "", true));  $block_count = ceil($key_length / $hash_length);    $output = "";  for($i = 1; $i <= $block_count; $i++) {  // $i encoded as 4 bytes, big endian.  $last = $salt . pack("N", $i);  // first iteration  $last = $xorsum = hash_hmac($algorithm, $last, $password, true);  // perform the other $count - 1 iterations  for ($j = 1; $j < $count; $j++) {  $xorsum ^= ($last = hash_hmac($algorithm, $last, $password, true));  }  $output .= $xorsum;  }  return substr($output, 0, $key_length);  }    }   $encrypted = "pLgIEjhNGDMfI0IynoAdbey3NKbOJzgUzYAlU14OWOpuZy7/lr7HRtFhiRKfjbZz"; $iv = "This_is_the_password_salt"; $key = "This_is_the_input_key"; $foo = new foo; $dev = $foo->pbkdf2("sha1", $key, $iv, 1000, 48, true); $derived_key = substr($dev, 0, 32); //Keylength: 32 $derived_iv = substr($dev, 32, 16); // IV-length: 16 echo "<br/>"; echo "Key: ".$derived_key."<br/>"; echo "IV:  ".$derived_iv."<br/>";   echo "Decrypted: ".mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $derived_key, base64_decode($encrypted), MCRYPT_MODE_CBC, $derived_iv); ?> 

Key: .g���13f^sI>M��j$\�+�od�mY# �! IV: �2]��&y�q� WJ�� Decrypted: Co-operation is the key to success! 

<?php   class Foo { public function decrypt_full($key, $iv, $encrypted) { $dev = $this->pbkdf2("sha1", $key, $iv, 1000, 48, true); $derived_key = substr($dev, 0, 32); //Keylength: 32 $derived_iv = substr($dev, 32, 16); // IV-length: 16 return mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $derived_key, base64_decode($encrypted), MCRYPT_MODE_CBC, $derived_iv); } private function pbkdf2($algorithm, $password, $salt, $count, $key_length, $raw_output = false) { $algorithm = strtolower($algorithm); if(!in_array($algorithm, hash_algos(), true)) die('PBKDF2 ERROR: Invalid hash algorithm.'); if($count <= 0 || $key_length <= 0) die('PBKDF2 ERROR: Invalid parameters.'); $hash_length = strlen(hash($algorithm, "", true)); $block_count = ceil($key_length / $hash_length); $output = ""; for($i = 1; $i <= $block_count; $i++) { // $i encoded as 4 bytes, big endian. $last = $salt . pack("N", $i); // first iteration $last = $xorsum = hash_hmac($algorithm, $last, $password, true); // perform the other $count - 1 iterations for ($j = 1; $j < $count; $j++) { $xorsum ^= ($last = hash_hmac($algorithm, $last, $password, true)); } $output .= $xorsum; } return substr($output, 0, $key_length); } } //########################################################################################### $encrypted = "pLgIEjhNGDMfI0IynoAdbey3NKbOJzgUzYAlU14OWOpuZy7/lr7HRtFhiRKfjbZz"; $iv = "This_is_the_password_salt"; $key = "This_is_the_input_key"; $foo = new foo; echo "<br/>"; echo "Encrypted String: ".$encrypted."<br/>"; echo "Decrypted string: ".$foo->decrypt_full($key, $iv, $encrypted )."<br/>"; ?> 

Key: .g���13f^sI>M��j$\�+�od�mY# �! IV: �2]��&y�q� WJ�� Decrypted: Co-operation is the key to success!