Cannot use VerifyEncoded when mode is argon2id

[florian]

Hey.

It's impossible to verify an encoded hash when using argon2id. I did some testing and it seems like it's related to the following code:

func getMode(s string) (int, error) {
	switch {
	case strings.HasPrefix(s, "$argon2d"):
		return ModeArgon2d, nil
	case strings.HasPrefix(s, "$argon2i"):
		return ModeArgon2i, nil
	case strings.HasPrefix(s, "$argon2id"):
		return ModeArgon2id, nil
	default:
		return -1, ErrDecodingFail
	}
}

"argon2id" also starts with "argon2i", so it's recognized as the wrong hash type, which will cause an error when calling C.argon2_verify