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<?php |
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/** |
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* Hash.php |
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* |
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* PHP version 7 |
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* |
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* @category Dcrypt |
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* @package Dcrypt |
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* @author Michael Meyer (mmeyer2k) <[email protected]> |
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* @license http://opensource.org/licenses/MIT The MIT License (MIT) |
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* @link https://github.com/mmeyer2k/dcrypt |
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*/ |
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namespace Dcrypt; |
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/** |
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* An opaque 480 bit / 60 byte iterative hash function. |
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* |
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* 16 bytes => iv |
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* 8 bytes => cost hash |
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* 4 bytes => cost |
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* 32 bytes => hmac |
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* |
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* Byte format: |
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* |
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* costhash hmachmachmachmachmachmachmachmac |
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* ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |
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* iviviviviviviviv cost |
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* |
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* @category Dcrypt |
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* @package Dcrypt |
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* @author Michael Meyer (mmeyer2k) <[email protected]> |
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* @license http://opensource.org/licenses/MIT The MIT License (MIT) |
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* @link https://github.com/mmeyer2k/dcrypt |
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* @link https://apigen.ci/github/mmeyer2k/dcrypt/namespace-Dcrypt.html |
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*/ |
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class Hash |
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{ |
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const ALGO = 'sha256'; |
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/** |
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* Internal function used to build the actual hash. |
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* |
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* @param string $data Data to hash |
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* @param string $pass Password to use in HMAC call |
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* @param int $cost Number of iterations to use |
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* @param string|null $salt Initialization vector to use in HMAC calls |
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* @return string |
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*/ |
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private static function build(string $data, string $pass, int $cost, string $salt = null): string |
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{ |
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// Generate salt if needed |
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$salt = $salt ?? \random_bytes(16); |
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// Generate a deterministic hash of the password |
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$pkey = \hash_pbkdf2(self::ALGO, $pass, $salt, $cost, 0, true); |
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// HMAC the input parameter with the generated key |
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$hash = \hash_hmac(self::ALGO, $data, $pkey, true); |
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// Covert cost value to byte array and encrypt |
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$cost = self::costEncrypt($cost, $salt, $pass); |
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// Create a hash of the cost to prevent DOS attacks caused by |
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// flipping bits in the cost area of the blob and then requesting validation |
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$chsh = self::costHash($cost, $pass); |
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// Return the salt + cost + hmac as a single string |
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return $salt . $chsh . $cost . $hash; |
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} |
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/** |
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* Encrypts the cost value so that it can be added to the output hash discretely |
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* |
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* @param int $cost |
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* @param string $salt |
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* @param string $pass |
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* @return string |
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*/ |
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private static function costEncrypt(int $cost, string $salt, string $pass): string |
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{ |
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// Pack the cost value into a 4 byte string |
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$packed = pack('N', $cost); |
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// Encrypt the string with the Otp stream cipher |
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return Otp::crypt($packed, ($pass . $salt), self::ALGO); |
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} |
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/** |
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* Decrypts the cost string back into an int |
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* |
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* @param string $pack |
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* @param string $salt |
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* @param string $pass |
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* @return int |
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*/ |
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private static function costDecrypt(string $pack, string $salt, string $pass): int |
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{ |
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// Decrypt the cost value stored in the 32bit int |
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$pack = Otp::crypt($pack, ($pass . $salt), self::ALGO); |
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// Unpack the value back to an integer and return to caller |
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return unpack('N', $pack)[1]; |
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} |
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/** |
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* Hash an input string into a salted 52 bit hash. |
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* |
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* @param string $data Data to hash. |
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* @param string $pass HMAC validation password. |
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* @param int $cost Cost value of the hash. |
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* @return string |
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*/ |
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public static function make(string $data, string $pass, int $cost = 250000): string |
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{ |
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return self::build($data, $pass, $cost, null); |
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} |
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/** |
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* Check the validity of a hash. |
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* |
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* @param string $data Input to test. |
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* @param string $hash Known hash to validate against. |
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* @param string $pass HMAC password to use during iterative hash. |
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* @return boolean |
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*/ |
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public static function verify(string $data, string $hash, string $pass): bool |
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{ |
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// Get the salt value from the decrypted prefix |
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$salt = Str::substr($hash, 0, 16); |
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// Get the encrypted cost bytes out of the blob |
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$chsh = Str::substr($hash, 16, 8); |
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// Get the encrypted cost bytes out of the blob |
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$cost = Str::substr($hash, 24, 4); |
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// If the provided cost hash does not calculate to be the same as the one provided then consider the hash invalid. |
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if ($chsh !== self::costHash($cost, $pass)) { |
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return false; |
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} |
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// Decrypt the cost value stored in the 32bit int |
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$cost = self::costDecrypt($cost, $salt, $pass); |
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// Build a hash from the input for comparison |
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$calc = self::build($data, $pass, $cost, $salt); |
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// Return the boolean equivalence |
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return Str::equal($hash, $calc); |
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} |
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/** |
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* Returns the correct hash for an encrypted cost value. |
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* |
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* @param string $cost |
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* @param string $pass |
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* @return string |
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*/ |
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private static function costHash(string $cost, string $pass): string |
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{ |
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return Str::substr(\hash_hmac(self::ALGO, $cost, $pass, true), 0, 8); |
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} |
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} |
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mmeyer2k /
dcrypt
