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<?php /** * A hash utility data mapper class * * This class's purpose is to store information about hash algorithms that is * otherwise unavailable during runtime. Some information is available (such * as the output size), but is included anyway for performance and completeness * reasons. * * PHP version 5.3 * * @category PHPPasswordLib * @package Hash * @author Anthony Ferrara <ircmaxell@ircmaxell.com> * @copyright 2011 The Authors * @license http://www.opensource.org/licenses/mit-license.html MIT License * @version Build @@version@@ */ namespace SecurityLib; /** * A hash utility data mapper class * * This class's purpose is to store information about hash algorithms that is * otherwise unavailable during runtime. Some information is available (such * as the output size), but is included anyway for performance and completeness * reasons. * * PHP version 5.3 * * @category PHPPasswordLib * @package Hash * @author Anthony Ferrara <ircmaxell@ircmaxell.com> */ class Hash { /** * This array contains information about each hash function available to PHP * at the present time. Block sizes are not available from functions, so they * must be hard coded. * * The "secure" indicates the strength of the hash and whether or not any known * cryptographic attacks exist for the hash function. This will only apply when * using the hash functions for situations that require cryptographic strength * such as message signing. For other uses the insecure ones can have valid * uses. * * @var array An array of information about each supported hash function */ protected static $hashInfo = array( 'md2' => array( 'HashSize' => 128, 'BlockSize' => 128, 'secure' => false, ), 'md4' => array( 'HashSize' => 128, 'BlockSize' => 512, 'secure' => false, ), 'md5' => array( 'HashSize' => 128, 'BlockSize' => 512, 'secure' => false, ), 'sha1' => array( 'HashSize' => 160, 'BlockSize' => 512, 'secure' => false, ), 'sha224' => array( 'HashSize' => 224, 'BlockSize' => 512, 'secure' => true, ), 'sha256' => array( 'HashSize' => 256, 'BlockSize' => 512, 'secure' => true, ), 'sha384' => array( 'HashSize' => 384, 'BlockSize' => 1024, 'secure' => true, ), 'sha512' => array( 'HashSize' => 512, 'BlockSize' => 1024, 'secure' => true, ), 'ripemd128' => array( 'HashSize' => 128, 'BlockSize' => 512, 'secure' => true, ), 'ripemd160' => array( 'HashSize' => 160, 'BlockSize' => 512, 'secure' => true, ), 'ripemd256' => array( 'HashSize' => 256, 'BlockSize' => 512, 'secure' => true, ), 'ripemd320' => array( 'HashSize' => 320, 'BlockSize' => 512, 'secure' => true, ), 'whirlpool' => array( 'HashSize' => 512, 'BlockSize' => 512, 'secure' => true, ), 'tiger128,3' => array( 'HashSize' => 128, 'BlockSize' => 512, 'secure' => true, ), 'tiger160,3' => array( 'HashSize' => 160, 'BlockSize' => 512, 'secure' => true, ), 'tiger192,3' => array( 'HashSize' => 192, 'BlockSize' => 512, 'secure' => true, ), 'tiger128,4' => array( 'HashSize' => 128, 'BlockSize' => 512, 'secure' => true, ), 'tiger160,4' => array( 'HashSize' => 160, 'BlockSize' => 512, 'secure' => true, ), 'tiger192,4' => array( 'HashSize' => 192, 'BlockSize' => 512, 'secure' => true, ), 'snefru' => array( 'HashSize' => 256, 'BlockSize' => 512, 'secure' => false, ), 'snefru256' => array( 'HashSize' => 256, 'BlockSize' => 512, 'secure' => false, ), 'gost' => array( 'HashSize' => 256, 'BlockSize' => 256, 'secure' => false, ), 'adler32' => array( 'HashSize' => 32, 'BlockSize' => 16, 'secure' => false, ), 'crc32' => array( 'HashSize' => 32, 'BlockSize' => 32, 'secure' => false, ), 'crc32b' => array( 'HashSize' => 32, 'BlockSize' => 32, 'secure' => false, ), 'salsa10' => array( 'HashSize' => 512, 'BlockSize' => 512, 'secure' => true, ), 'salsa20' => array( 'HashSize' => 512, 'BlockSize' => 512, 'secure' => true, ), 'haval128,3' => array( 'HashSize' => 128, 'BlockSize' => 1024, 'secure' => false, ), 'haval160,3' => array( 'HashSize' => 160, 'BlockSize' => 1024, 'secure' => false, ), 'haval192,3' => array( 'HashSize' => 192, 'BlockSize' => 1024, 'secure' => false, ), 'haval224,3' => array( 'HashSize' => 224, 'BlockSize' => 1024, 'secure' => false, ), 'haval256,3' => array( 'HashSize' => 256, 'BlockSize' => 1024, 'secure' => false, ), 'haval128,4' => array( 'HashSize' => 128, 'BlockSize' => 1024, 'secure' => false, ), 'haval160,4' => array( 'HashSize' => 160, 'BlockSize' => 1024, 'secure' => false, ), 'haval192,4' => array( 'HashSize' => 192, 'BlockSize' => 1024, 'secure' => false, ), 'haval224,4' => array( 'HashSize' => 224, 'BlockSize' => 1024, 'secure' => false, ), 'haval256,4' => array( 'HashSize' => 256, 'BlockSize' => 1024, 'secure' => false, ), 'haval128,5' => array( 'HashSize' => 128, 'BlockSize' => 1024, 'secure' => false, ), 'haval160,5' => array( 'HashSize' => 160, 'BlockSize' => 1024, 'secure' => false, ), 'haval192,5' => array( 'HashSize' => 192, 'BlockSize' => 1024, 'secure' => false, ), 'haval224,5' => array( 'HashSize' => 224, 'BlockSize' => 1024, 'secure' => false, ), 'haval256,5' => array( 'HashSize' => 256, 'BlockSize' => 1024, 'secure' => false, ), 'joaat' => array( 'HashSize' => 32, 'BlockSize' => 64, 'secure' => false, ), 'fnv132' => array( 'HashSize' => 32, 'BlockSize' => 32, 'secure' => false, ), 'fnv164' => array( 'HashSize' => 64, 'BlockSize' => 64, 'secure' => false, ), ); /** * Get the block size of the specified function in bytes * * @param string $hash The hash function to look up * * @return int The number of bytes in the block function */ public static function getBlockSize($hash) { return static::getBlockSizeInBits($hash) / 8; } /** * Get the block size of the specified function in bits * * @param string $hash The hash function to look up * * @return int The number of bits in the block function */ public static function getBlockSizeInBits($hash) { if (isset(static::$hashInfo[$hash]['BlockSize'])) { return static::$hashInfo[$hash]['BlockSize']; } return 0; } /** * Get the output size of the specified function in bytes * * @param string $hash The hash function to look up * * @return int The number of bytes outputted by the hash function */ public static function getHashSize($hash) { return static::getHashSizeInBits($hash) / 8; } /** * Get the output size of the specified function in bits * * @param string $hash The hash function to look up * * @return int The number of bits outputted by the hash function */ public static function getHashSizeInBits($hash) { if (isset(static::$hashInfo[$hash]['HashSize'])) { return static::$hashInfo[$hash]['HashSize']; } return 0; } /** * Check to see if the hash function specified is available * * @param string $hash The hash function to look up * * @return boolean If the hash function is available in this version of PHP */ public static function isAvailable($hash) { return in_array($hash, hash_algos()); } /** * Check to see if the specified hash function is secure enough for * cryptographic uses * * The "secure" indicates the strength of the hash and whether or not any known * cryptographic attacks exist for the hash function. This will only apply when * using the hash functions for situations that require cryptographic strength * such as message signing. For other uses the insecure ones can have valid * uses. * * @param string $hash The hash function to look up * * @return bolean If the function is secure */ public static function isSecure($hash) { if (isset(static::$hashInfo[$hash])) { return static::$hashInfo[$hash]['secure']; } return false; } }