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run code in 200+ php & hhvm versions
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<?php const CIPHER = MCRYPT_RIJNDAEL_128; const KEY_BYTE_SIZE = 16; const CIPHER_MODE = 'cbc'; const HASH_FUNCTION = 'sha256'; const MAC_BYTE_SIZE = 32; const ENCRYPTION_INFO = 'PIPS|KeyForEncryption'; const AUTHENTICATION_INFO = 'PIPS|KeyForAuthentication'; $key = base64_decode('wdmd3XIhnOAelom4Y8yPbw=='); $ekey = HKDF(HASH_FUNCTION, $key, KEY_BYTE_SIZE, ENCRYPTION_INFO); print "$ekey\n"; print urlsafe_b64encode($ekey); function urlsafe_b64encode($string) { $data = base64_encode($string); $data = str_replace(array('+','/','='),array('-','_',''),$data); return $data; } function HKDF($hash, $ikm, $length, $info = '', $salt = NULL) { // Find the correct digest length as quickly as we can. $digest_length = MAC_BYTE_SIZE; if ($hash != HASH_FUNCTION) { $digest_length = strlen(hash_hmac($hash, '', '', true)); } // Sanity-check the desired output length. if (empty($length) || !is_int($length) || $length < 0 || $length > 255 * $digest_length) { return CannotPerformOperationException(); } // "if [salt] not provided, is set to a string of HashLen zeroes." if (is_null($salt)) { $salt = str_repeat("\x00", $digest_length); } // HKDF-Extract: // PRK = HMAC-Hash(salt, IKM) // The salt is the HMAC key. $prk = hash_hmac($hash, $ikm, $salt, true); // HKDF-Expand: // This check is useless, but it serves as a reminder to the spec. if (strlen($prk) < $digest_length) { throw new CannotPerformOperationException(); } // T(0) = '' $t = ''; $last_block = ''; for ($block_index = 1; strlen($t) < $length; $block_index++) { // T(i) = HMAC-Hash(PRK, T(i-1) | info | 0x??) $last_block = hash_hmac( $hash, $last_block . $info . chr($block_index), $prk, true ); // T = T(1) | T(2) | T(3) | ... | T(N) $t .= $last_block; } return $t; // ORM = first L octets of T $orm = substr($t, 0, $length); if ($orm === FALSE) { throw new CannotPerformOperationException(); } return $orm; } ?>
based on KRNWg
Output for 7.2.0
Warning: Use of undefined constant MCRYPT_RIJNDAEL_128 - assumed 'MCRYPT_RIJNDAEL_128' (this will throw an Error in a future version of PHP) in /in/bmfN3 on line 3 �6�h��!�q�:�Ơx}��1��[AU��8 4Qg25miFmSHjcfI6ixTGoHh95xXOMa2GBltBVfDwjzg
Output for 5.3.19 - 5.3.29, 5.5.35, 5.6.21, 7.0.6 - 7.1.10
Notice: Use of undefined constant MCRYPT_RIJNDAEL_128 - assumed 'MCRYPT_RIJNDAEL_128' in /in/bmfN3 on line 3 �6�h��!�q�:�Ơx}��1��[AU��8 4Qg25miFmSHjcfI6ixTGoHh95xXOMa2GBltBVfDwjzg
Output for 5.4.0 - 5.5.34, 5.6.8 - 5.6.20, 7.0.0 - 7.0.5
�6�h��!�q�:�Ơx}��1��[AU��8 4Qg25miFmSHjcfI6ixTGoHh95xXOMa2GBltBVfDwjzg