C# 3DES 加密

ゝ一纸荒年。 2022-06-06 01:18 271阅读 0赞

public class DESHelper
        {
            #region 3des加密
    
            /// <summary>
            /// 3des ecb模式加密
            /// </summary>
            /// <param name="aStrString">待加密的字符串</param>
            /// <param name="aStrKey">密钥</param>
            /// <param name="iv">加密矢量：只有在CBC解密模式下才适用</param>
            /// <param name="mode">运算模式</param>
            /// <returns>加密后的字符串</returns>
            public static string Encrypt3Des(string aStrString, string aStrKey, CipherMode mode = CipherMode.ECB, string iv = "12345678")
            {
                try
                {
                    var des = new TripleDESCryptoServiceProvider
                    {
                        Key = Encoding.UTF8.GetBytes(aStrKey),
                        Mode = mode
                    };
                    if (mode == CipherMode.CBC)
                    {
                        des.IV = Encoding.UTF8.GetBytes(iv);
                    }
                    var desEncrypt = des.CreateEncryptor();
                    byte[] buffer = Encoding.UTF8.GetBytes(aStrString);
                    buffer = Encoding.Convert(Encoding.GetEncoding("UTF-8"), Encoding.GetEncoding("GB2312"), buffer);
                    return Convert.ToBase64String(desEncrypt.TransformFinalBlock(buffer, 0, buffer.Length));
                }
                catch (Exception e)
                {
                    return string.Empty;
                }
            }
    
            #endregion
    
            #region 3des解密
    
            /// <summary>
            /// des 解密
            /// </summary>
            /// <param name="aStrString">加密的字符串</param>
            /// <param name="aStrKey">密钥</param>
            /// <param name="iv">解密矢量：只有在CBC解密模式下才适用</param>
            /// <param name="mode">运算模式</param>
            /// <returns>解密的字符串</returns>
            public static string Decrypt3Des(string aStrString, string aStrKey, CipherMode mode = CipherMode.ECB, string iv = "12345678")
            {
                try
                {
                    var des = new TripleDESCryptoServiceProvider
                    {
                        Key = Encoding.UTF8.GetBytes(aStrKey),
                        Mode = mode,
                        Padding = PaddingMode.PKCS7
                    };
                    if (mode == CipherMode.CBC)
                    {
                        des.IV = Encoding.UTF8.GetBytes(iv);
                    }
                    var desDecrypt = des.CreateDecryptor();
                    var result = "";
                    byte[] buffer = Convert.FromBase64String(aStrString);
                    result = Encoding.UTF8.GetString(desDecrypt.TransformFinalBlock(buffer, 0, buffer.Length));
                    return result;
                }
                catch (Exception e)
                {
                    return string.Empty;
                }
            }
            #endregion
    
        }

测试：注意key字符长度为24

static void Main(string[] args)
            {
                //IV
                string IV = "20160120";
    
                //KEY
                string KEY = "012345678901234567891234";
    
                //data json string
                string dataJsonString = "TEST";
                Console.WriteLine("加密之前："+ dataJsonString);
    
                //3des 加密
                string Encrypt3Des = DESHelper.Encrypt3Des(dataJsonString, KEY, CipherMode.CBC, IV);
                Console.WriteLine("加密之后：" + Encrypt3Des);
    
                //3des 解密
                string Decrypt3Des = DESHelper.Decrypt3Des(Encrypt3Des, KEY, CipherMode.CBC, IV);
                Console.WriteLine("解密密之后：" + Decrypt3Des);
    
                Console.ReadKey();
            }

![20171026133554489][]

[20171026133554489]: /images/20220606/02928054c8c34f178a0f67f38f39361c.png