des加密解密

加密字符串 

public static string Encrypt(string sourceString, string key, string iv)
        {
            try
            {
                byte[] btKey = Encoding.UTF8.GetBytes(key);

                byte[] btIV = Encoding.UTF8.GetBytes(iv);

                DESCryptoServiceProvider des = new DESCryptoServiceProvider();

                using (MemoryStream ms = new MemoryStream())
                {
                    byte[] inData = Encoding.UTF8.GetBytes(sourceString);
                    try
                    {
                        using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write))
                        {
                            cs.Write(inData, 0, inData.Length);

                            cs.FlushFinalBlock();
                        }

                        return Convert.ToBase64String(ms.ToArray());
                    }
                    catch
                    {
                        return sourceString;
                    }
                }
            }
            catch { }

            return "DES加密出错";
        }

解密字符串

 public static string Decrypt(string encryptedString, string key, string iv)
        {
            byte[] btKey = Encoding.UTF8.GetBytes(key);

            byte[] btIV = Encoding.UTF8.GetBytes(iv);

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            using (MemoryStream ms = new MemoryStream())
            {
                byte[] inData = Convert.FromBase64String(encryptedString);
                try
                {
                    using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write))
                    {
                        cs.Write(inData, 0, inData.Length);

                        cs.FlushFinalBlock();
                    }

                    return Encoding.UTF8.GetString(ms.ToArray());
                }
                catch
                {
                    return encryptedString;
                }
            }
        }

加密

public static string EncryptString(string sInputString, string sKey, string sIV)
        {
            try
            {
                byte[] data = Encoding.UTF8.GetBytes(sInputString);

                DESCryptoServiceProvider DES = new DESCryptoServiceProvider();

                DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

                DES.IV = ASCIIEncoding.ASCII.GetBytes(sIV);

                ICryptoTransform desencrypt = DES.CreateEncryptor();

                byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);

                return BitConverter.ToString(result);
            }
            catch { }

            return "转换出错！";
        }

解密

public static string DecryptString(string sInputString, string sKey, string sIV)
        {
            try
            {
                string[] sInput = sInputString.Split("-".ToCharArray());

                byte[] data = new byte[sInput.Length];

                for (int i = 0; i < sInput.Length; i++)
                {
                    data[i] = byte.Parse(sInput[i], NumberStyles.HexNumber);
                }

                DESCryptoServiceProvider DES = new DESCryptoServiceProvider();

                DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);

                DES.IV = ASCIIEncoding.ASCII.GetBytes(sIV);

                ICryptoTransform desencrypt = DES.CreateDecryptor();

                byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);

                return Encoding.UTF8.GetString(result);
            }
            catch { }

            return "解密出错！";
        }