C# DES加密，KEY和IV不同設置的寫法

1、KEY和IV分別賦值

//默認密鑰向量
        private static byte[] Iv= { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密鑰,要求為8位</param>
        /// <returns>加密成功返回加密后的字符串，失敗返回源串</returns>
        public static string EncryptDES(string encryptString, string encryptKey)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
                byte[] rgbIV = Iv;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
                var mStream = new MemoryStream();
                var cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey,rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            catch
            {
                return encryptString;
            }
        }

 

2、根據8位密鑰，建立KEY和IV

public static string Encrypt(string pToEncrypt, string sKey)
        {
            var des = new DESCryptoServiceProvider();
            //把字符串放到byte數組中  
            byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);

            //建立加密對象的密鑰和偏移量  
            des.Key = Encoding.ASCII.GetBytes(sKey);
            des.IV = Encoding.ASCII.GetBytes(sKey);

            var ms = new MemoryStream();
            var cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            
            return Encoding.UTF8.GetString(ms.ToArray());
        }

 

3、KEY和IV為空，調用 GenerateKey 方法以創建新的隨機key ，調用 GenerateIV 方法以創建新的隨機 IV

using System; using System.Security.Cryptography; using System.Text; class EncryptorExample { private static string quote = "Things may come to those who wait, but only the " + "things left by those who hustle. -- Abraham Lincoln"; public static void Main() { AesCryptoServiceProvider aesCSP = new AesCryptoServiceProvider(); aesCSP.GenerateKey(); aesCSP.GenerateIV(); byte[] encQuote = EncryptString(aesCSP, quote); Console.WriteLine("Encrypted Quote:\n"); Console.WriteLine(Convert.ToBase64String(encQuote)); Console.WriteLine("\nDecrypted Quote:\n"); Console.WriteLine(DecryptBytes(aesCSP, encQuote)); } public static byte[] EncryptString(SymmetricAlgorithm symAlg, string inString) { byte[] inBlock = UnicodeEncoding.Unicode.GetBytes(inString); ICryptoTransform xfrm = symAlg.CreateEncryptor(); byte[] outBlock = xfrm.TransformFinalBlock(inBlock, 0, inBlock.Length); return outBlock; } public static string DecryptBytes(SymmetricAlgorithm symAlg, byte[] inBytes) { ICryptoTransform xfrm = symAlg.CreateDecryptor(); byte[] outBlock = xfrm.TransformFinalBlock(inBytes, 0, inBytes.Length); return UnicodeEncoding.Unicode.GetString(outBlock); } }

 

另外：一般DES加密完的字符串大概長這樣：U2FsdGVkX1+PX0/VZiqtq/fOMdgdX7mTQh3RNACgods=

因為有一些特殊符號，如果拼在querystring中不便於傳輸，可以考慮這樣寫：

 var str= new StringBuilder();
 foreach (byte b in ms.ToArray())
 {
     str.AppendFormat("{0:X2}", b);
 }
 return str.ToString();

來代替直接返回 return Encoding.UTF8.GetString(ms.ToArray());

這樣加密后的字符串長這樣：4BD2B330AA45FFAD57109EE56D34E21B7E3858BA45A096220EB6634A5B779E80