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<?php |
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/** |
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* @package toolkit |
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*/ |
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/** |
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* Cryptography is a utility class that offers a number of general purpose cryptography- |
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* related functions for message digestation as well as (backwards-)compatibility |
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* checking. The message digestation algorithms are placed in the subclasses |
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* `SHA1` and `PBKDF2`. |
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* |
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* @since Symphony 2.3.1 |
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* @see PBKDF2 |
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*/ |
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class Cryptography |
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{ |
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/** |
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* Uses an instance of `PBKDF2` to create a hash. If you require other |
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* hashes, see the related functions of the `MD5` or `SHA1` classes |
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* |
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* @uses PBKDF2::hash() |
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* @param string $input |
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* the string to be hashed |
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* @return string |
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* the hashed string |
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*/ |
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public static function hash($input) |
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{ |
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return PBKDF2::hash($input); |
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} |
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/** |
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* Compares a given hash with a clean text password by figuring out the |
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* algorithm that has been used and then calling the appropriate sub-class |
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* |
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* @uses hash_equals() |
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* @uses PBKDF2::compare() |
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* @param string $input |
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* the clear text password |
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* @param string $hash |
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* the hash the password should be checked against |
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* @param boolean $isHash |
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* if the $input is already a hash |
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* @return boolean |
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* the result of the comparison |
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*/ |
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public static function compare($input, $hash, $isHash = false) |
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{ |
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$version = substr($hash, 0, 8); |
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if (!$input || !$hash) { |
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return false; |
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} |
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if ($isHash === true) { |
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return hash_equals($hash, $input); |
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} elseif ($version === PBKDF2::PREFIX) { // salted PBKDF2 |
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return PBKDF2::compare($input, $hash); |
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} |
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// the hash provided doesn't make any sense |
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return false; |
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} |
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/** |
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* Checks if provided hash has been computed by most recent algorithm |
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* returns true if otherwise |
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* |
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* @param string $hash |
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* the hash to be checked |
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* @return boolean |
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* whether the hash should be re-computed |
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*/ |
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public static function requiresMigration($hash) |
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{ |
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$version = substr($hash, 0, 8); |
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if ($version === PBKDF2::PREFIX) { // salted PBKDF2, let the responsible class decide |
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return PBKDF2::requiresMigration($hash); |
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} |
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return true; |
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} |
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/** |
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* Generates a salt to be used in message digestation. |
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* |
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* @param integer $length |
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* the length of the salt |
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* @return string |
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* a hexadecimal string |
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*/ |
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public static function generateSalt($length) |
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{ |
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mt_srand(intval(microtime(true)*100000 + memory_get_usage(true))); |
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return substr(sha1(uniqid(mt_rand(), true)), 0, $length); |
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} |
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/** |
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* Returns a string generated from random bytes. |
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* It requires a minimum length of 16. |
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* It first tries to call PHP's random_byte. |
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* If not available, it will try openssl_random_pseudo_bytes. |
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* If not available, it will revert to `Cryptography::generateSalt()`. |
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* |
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* @uses Cryptography::generateSalt() |
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* @param integer $length |
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* The number of random bytes to get. |
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* The minimum is 16. |
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* Defaults to 40, which is 160 bits of entropy. |
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* @return string |
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* @throws Exception |
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* If the requested length is smaller than 16. |
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*/ |
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public static function randomBytes($length = 40) |
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{ |
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if ($length < 16) { |
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throw new Exception('Can not generate less than 16 random bytes'); |
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} |
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if (function_exists('random_bytes')) { |
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return bin2hex(random_bytes($length / 2)); |
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} elseif (function_exists('openssl_random_pseudo_bytes')) { |
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return bin2hex(openssl_random_pseudo_bytes($length / 2)); |
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} |
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return self::generateSalt($length); |
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} |
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} |
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symphonycms /
symphony-2
