Added some helper methods to Crypto. string md5(string data, void|bool raw) string sha1(string data, void|bool raw) string sha256(string data, void|bool raw) These methods return a hexadecimal string unless `raw` is given. These methods are composed via the helper method `hash()`. string hmac_md5(string secret, string data) string hmac_sha1(string secret, string data) string hmac_sha256(string secret, string data) These methods return a hexadecimal string. These methods are composed via the helper method `hash_hmac()` which can be used to construct new hmac hashing functions.