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  • DES-固定密钥-加密-解密

    /// <summary>
            /// 进行DES加密。
            /// </summary>
            /// <param name="pToEncrypt">要加密的字符串。</param>
            /// <param name="sKey">密钥,且必须为8位。</param>
            /// <returns>以Base64格式返回的加密字符串。</returns>
            public static string DESEncrypt(string pToEncrypt,string strkey)
            {
                try
                {
                    using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
                    {
                        byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);
                        des.Key = ASCIIEncoding.ASCII.GetBytes(strkey.Substring(0,8));
                        des.IV = IVKeys;
                        System.IO.MemoryStream ms = new System.IO.MemoryStream();
                        using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
                        {
                            cs.Write(inputByteArray, 0, inputByteArray.Length);
                            cs.FlushFinalBlock();
                            cs.Close();
                        }
                        string str = Convert.ToBase64String(ms.ToArray());
                        ms.Close();
                        return str.Replace("+", "_");
                    }
                }
                catch
                {
                    return "";
                }
            }
    /// <summary>
            /// 进行DES解密。
            /// </summary>
            /// <param name="pToDecrypt">要解密的以Base64</param>
            /// <param name="sKey">密钥,且必须为8位。</param>
            /// <returns>已解密的字符串。</returns>
            public static string DESDecrypt(string pToDecrypt, string strkey)
            {
                try
                {
                    byte[] inputByteArray = Convert.FromBase64String(pToDecrypt.Replace("_", "+"));
                    using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
                    {
                        des.Key = ASCIIEncoding.ASCII.GetBytes(strkey.Substring(0, 8));
                        des.IV = IVKeys;
                        System.IO.MemoryStream ms = new System.IO.MemoryStream();
                        using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                        {
                            cs.Write(inputByteArray, 0, inputByteArray.Length);
                            cs.FlushFinalBlock();
                            cs.Close();
                        }
                        string str = Encoding.UTF8.GetString(ms.ToArray());
                        ms.Close();
                        return str;
                    }
                }
                catch
                {
                    return "";
                }
            }
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  • 原文地址:https://www.cnblogs.com/liuwentian/p/3542533.html
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