Des与3Des加密解密

蔚落 2021-12-01 15:38 368阅读 0赞

/// <summary>
        /// Des和3Des算法
        /// </summary>
        public class Des
        {
            /// <summary>
            /// Des加密
            /// </summary>
            /// <param name="pToEncrypt">明文</param>
            /// <param name="sKey">密钥</param>
            /// <returns></returns>
            public static string DESEnCode(string pToEncrypt, string sKey)
            {
                pToEncrypt = HttpContext.Current.Server.UrlEncode(pToEncrypt);
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(pToEncrypt);
    
    
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
    
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
    
                StringBuilder ret = new StringBuilder();
                foreach (byte b in ms.ToArray())
                {
                    ret.AppendFormat("{0:X2}", b);
                }
                ret.ToString();
                return ret.ToString();
            }
            /// <summary>
            /// 3Des加密(密钥不能每8位重复，例如：123456781234567812345678，如果这样则算法退化为Des，C#会检测，不能使用)
            /// </summary>
            /// <param name="a_strString">明文</param>
            /// <param name="a_strKey">密钥</param>
            /// <returns></returns>
            public string Decrypt3DES(string a_strString, string a_strKey)
            {
                TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
    
                DES.Key = ASCIIEncoding.ASCII.GetBytes(a_strKey);
                DES.Mode = CipherMode.ECB;
                DES.Padding = System.Security.Cryptography.PaddingMode.PKCS7;
    
                ICryptoTransform DESDecrypt = DES.CreateEncryptor();
    
                string result = "";
                try
                {
                    byte[] Buffer = Convert.FromBase64String(a_strString);
                    result = ASCIIEncoding.ASCII.GetString(DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));
                }
                catch (Exception e)
                {
    
                }
                return result;
            }
            /// <summary>
            /// Des解密
            /// </summary>
            /// <param name="encryptedString">密文</param>
            /// <param name="key">密钥</param>
            /// <returns></returns>
            public string Decrypt(string encryptedString, string key)
            {
                byte[] btKey = Encoding.UTF8.GetBytes(key);
    
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                des.Key = ASCIIEncoding.ASCII.GetBytes(key);
                des.Mode = CipherMode.ECB;
                des.Padding = System.Security.Cryptography.PaddingMode.PKCS7;
                using (MemoryStream ms = new MemoryStream())
                {
                    byte[] inData = Convert.FromBase64String(encryptedString);
                    try
                    {
                        using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                        {
                            cs.Write(inData, 0, inData.Length);
    
                            cs.FlushFinalBlock();
                        }
    
                        return Encoding.UTF8.GetString(ms.ToArray());
                    }
                    catch
                    {
                        return encryptedString;
                    }
                }
            }
            /// <summary>
            /// 3Des解密(密钥不能每8位重复，例如：123456781234567812345678，如果这样则算法退化为Des，C#会检测，不能使用)
            /// </summary>
            /// <param name="a_strString">密文</param>
            /// <param name="a_strKey">密钥</param>
            /// <returns></returns>
            public string Decrypt3DES(string a_strString, string a_strKey)
            {
                TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
    
                DES.Key = ASCIIEncoding.ASCII.GetBytes(a_strKey);
                DES.Mode = CipherMode.ECB;
                DES.Padding = System.Security.Cryptography.PaddingMode.PKCS7;
    
                ICryptoTransform DESDecrypt = DES.CreateDecryptor();
    
                string result = "";
                try
                {
                    byte[] Buffer = Convert.FromBase64String(a_strString);
                    result = ASCIIEncoding.ASCII.GetString(DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));
                }
                catch (Exception e)
                {
    
                }
                return result;
            }
        }

转载于:https://www.cnblogs.com/CielWater/p/4253099.html