public static String encryptString plain String key String mode String algorithm = KNOWN_MODESgetmode; if algorithm == null throw new IllegalArgumentException未知的加密模式： + mode; byte plainBytes

public static string Encrypt(string plain, string key, string mode) { string algorithm = KNOWN_MODES[mode]; if (algorithm == null) { throw new ArgumentException("未知的加密模式：" + mode); }

byte[] plainBytes = Encoding.UTF8.GetBytes(plain);
byte[] keyBytes = CreateKey(key, algorithm);
byte[] cipherBytes = CryptoUtils.Encrypt(plainBytes, keyBytes, algorithm, mode);
return BitConverter.ToString(cipherBytes).Replace("-", "").ToUpper();

}