crypt

type Crypter interface {
	// Crypt computes the hash of password string k using the given hash
	// parameters. Applying Crypt to the returned hash is deterministic,
	// that is, it always returns the same result that is equal to the
	// returned hash.
	//
	// If h contains a salt string without output, then Crypt computes a
	// hash output whose length is the default output length for the
	// specified hash algorithm. The resulting hash contains a strict,
	// deterministic encoding of the used parameters, salt and output.
	//
	// If h does not contain salt (and therefore output), then it generates
	// a new new appropriate salt value as mandated by the specified hash
	// algorithm using the defined default salt length, and then proceeds
	// as in the previous case.
	//
	// If h contains hash function output, then it computes an output with
	// exactly the same length as the one provided in the input. It returns
	// the exact parameters and salt as they were received, and the newly
	// computed output. Basically, it recomputes hash output for password
	// verification.
	Crypt(k, h string) (string, error)
}