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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 5 |
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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 512 bit iterative hash function. |
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* |
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* 16 bytes => iv |
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* 12 bytes => cost checksum |
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* 4 bytes => cost |
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* 32 bytes => hmac |
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* |
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* ivivivivivivivivsssssssssssscosthmachmachmachmachmachmachmachmac |
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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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final class Hash extends Support |
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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 $input Data to hash |
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* @param string $password Password to use in HMAC call |
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* @param integer $cost Number of iterations to use |
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* @param string|null $salt Initialization vector to use in HMAC calls |
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* @return string |
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*/ |
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private static function build($input, $password, $cost, $salt = null) |
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{ |
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// Generate salt if needed |
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$salt = $salt === null ? Random::bytes(16) : $salt; |
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// Verify and normalize cost value |
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$cost = self::cost($cost); |
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// Create key to use for hmac operations |
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$key = \hash_hmac(self::ALGO, $salt, $password, true); |
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// Perform hash iterations. Get a 32 byte output value |
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$hash = self::ihmac($input, $key, $cost, self::ALGO); |
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// Return the salt + cost blob + hmac |
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return $salt . self::costHash($cost, $salt, $password) . $hash; |
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} |
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/** |
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* Return a normalized cost value. |
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* |
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* @param int $cost Number of iterations to use. |
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* |
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* @return int |
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*/ |
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private static function cost($cost) |
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{ |
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return $cost % \pow(2, 32); |
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} |
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private static function costHash($cost, $salt, $password) |
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{ |
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// Hash and return first 12 bytes |
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$hash = Str::substr(\hash_hmac(self::ALGO, $cost, $salt, true), 0, 12); |
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// Convert cost to base 256 then encrypt with OTP stream cipher |
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$cost = Otp::crypt(self::dec2bin($cost), $password); |
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return $hash . $cost; |
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} |
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/** |
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* Perform a raw iterative HMAC operation with a configurable algo. |
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* |
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* This class always performs at least one hash to prevent the input from |
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* being passed back unchanged if bad parameters are set. |
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* |
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* @param string $data Data to hash. |
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* @param string $key Key to use to authenticate the hash. |
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* @param integer $iter Number of times to iteratate the hash |
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* @param string $algo Name of algo (sha256 or sha512 recommended) |
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* |
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* @return string |
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*/ |
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public static function ihmac($data, $key, $iter, $algo = 'sha256') |
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{ |
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$iter = abs($iter); |
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for ($i = 0; $i <= $iter; $i++) { |
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$data = \hash_hmac($algo, $data . $i . $iter, $key, true); |
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} |
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if ($data === false) { |
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throw new \exception("$algo is not supported by hash_hmac"); |
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} |
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return $data; |
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} |
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/** |
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* Hash an input string into a salted 512 byte hash. |
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* |
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* @param string $input Data to hash. |
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* @param string $password HMAC validation password. |
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* @param integer $cost Cost value of the hash. |
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* |
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* @return string |
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*/ |
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public static function make($input, $password, $cost = 250000) |
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{ |
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return self::build($input, $password, $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 $input Input to test. |
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* @param string $hash Known hash to validate against. |
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* @param string $password HMAC password to use during iterative hash. |
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* |
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* @return boolean |
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*/ |
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public static function verify($input, $hash, $password) |
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{ |
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// Get the salt value from the decrypted prefix |
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$salt = Str::substr($hash, 0, 16); |
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// Get the encrypted cost bytes |
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$cost = self::bin2dec(Otp::crypt(Str::substr($hash, 28, 4), $password)); |
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// Get the entire cost+hash blob for comparison |
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$blob = Str::substr($hash, 16, 16); |
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if (!Str::equal(self::costHash($cost, $salt, $password), $blob)) { |
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return false; |
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} |
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// Return the boolean equivalence |
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return Str::equal($hash, self::build($input, $password, $cost, $salt)); |
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} |
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} |
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mmeyer2k /
dcrypt
