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<?php |
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namespace Bcrypt; |
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class Bcrypt |
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{ |
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const VERSION = '1.0.0'; |
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/** |
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* @return string The encrypt text |
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*/ |
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public static function encrypt($plaintext, $bcrypt_version = '2y', $cost = 10) |
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{ |
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//make sure adding the cost in two digits |
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$cost = sprintf('%02d', $cost); |
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$salt = self::generateSalt(); |
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/* Create a string that will be passed to crypt, containing all |
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* of the settings, separated by dollar signs |
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*/ |
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$salt = '$'.implode('$', [$bcrypt_version, $cost, $salt]); |
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$ciphertext = crypt($plaintext, $salt); |
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return $ciphertext; |
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} |
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/** |
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* @return boolean The result that plaintext equals ciphertext or not |
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*/ |
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public static function verify($plaintext, $ciphertext) |
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{ |
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if (version_compare(PHP_VERSION, '5.6.0', '>=')) { |
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return hash_equals($ciphertext, crypt($plaintext, $ciphertext)); |
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} |
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return crypt($plaintext, $ciphertext) == $ciphertext; |
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} |
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public static function generateSalt() |
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{ |
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/* To generate the salt, first generate enough random bytes. Because |
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* base64 returns one character for each 6 bits, the we should generate |
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* at least 22*6/8=16.5 bytes, so we generate 17. Then we get the first |
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* 22 base64 characters |
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*/ |
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$bytes = openssl_random_pseudo_bytes(17); |
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if ($bytes === false) { |
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throw new RuntimeException('Unable to generate a random string'); |
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} |
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$salt = substr(base64_encode($bytes), 0, 22); |
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/* As blowfish takes a salt with the alphabet ./A-Za-z0-9 we have to |
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* replace any '+' in the base64 string with '.'. We don't have to do |
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* anything about the '=', as this only occurs when the b64 string is |
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* padded, which is always after the first 22 characters. |
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*/ |
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$salt = str_replace('+', '.', $salt); |
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return $salt; |
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} |
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} |
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Polarising /
bcrypt
