我亲自使用过的DES加密解密

最新推荐文章于 2025-07-01 15:50:01 发布

原创最新推荐文章于 2025-07-01 15:50:01 发布 · 561 阅读

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文章标签：

#加密 #string #byte #exception #encryption #encoding

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本文介绍了一种使用DES加密标准进行数据加密和解密的方法。通过具体的代码示例展示了如何利用.NET框架中的DESCryptoServiceProvider类来实现字符串的加密与解密过程。包括密钥的初始化、加密流程、以及解密流程。

public static String Encryption(String strText, String strEncrKey, int Num)
        {
            Byte[] byKey =   { };
            Byte[] IV =   { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
            try
            {
                if (Num != 1) strEncrKey = "A" + strEncrKey;
                if (strEncrKey.Length < 8)
                    for (int i = 0; i < 8; i++)
                    {
                        if (strEncrKey.Length < 8)
                            strEncrKey = "0" + strEncrKey;
                        else
                            break;
                    }
                byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                Byte[] inputByteArray = Encoding.UTF8.GetBytes(strText);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                return Convert.ToBase64String(ms.ToArray());
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }

        public static String Decryption(String strText, String sDecrKey, int Num)
        {
            Byte[] byKey =   { };
            Byte[] IV =   { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
            Byte[] inputByteArray = new byte[strText.Length];
            try
            {
                if (Num != 1) sDecrKey = "A" + sDecrKey;
                if (sDecrKey.Length < 8)
                    for (int i = 0; i < 8; i++)
                    {
                        if (sDecrKey.Length < 8)
                            sDecrKey = "0" + sDecrKey;
                        else
                            break;
                    }
                byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                inputByteArray = Convert.FromBase64String(strText);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                System.Text.Encoding encoding = System.Text.Encoding.UTF8;
                return encoding.GetString(ms.ToArray());
            }
            catch (Exception ex)
            {
                return ex.Message;
            }

}