3DES加密/解密算法的C#实现：（实现的方式很多，仅供参考）
public static bool DecryptFromBase64(string base64String, string key,out string DecryptString){DecryptString = "";try{// encode to bytesbyte[] KEY = HexStringToByteArray(key);byte[] CRYPTSTRING = Convert.FromBase64String(base64String);//set iv and keybyte[] tmpiv = { 49, 50, 51, 52, 53, 54, 55, 56 };byte[] tmpkey = { 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7 };for (int ii = 0; ii < 24; ii++){tmpkey[ii] = KEY[ii];}TripleDESCryptoServiceProvider dsp = new TripleDESCryptoServiceProvider();dsp.Mode = System.Security.Cryptography.CipherMode.CBC;dsp.Padding = System.Security.Cryptography.PaddingMode.PKCS7;ICryptoTransform tridesencrypt = dsp.CreateDecryptor(tmpkey, tmpiv);using (var ms = new MemoryStream(CRYPTSTRING)){using (var cs = new CryptoStream(ms, tridesencrypt, CryptoStreamMode.Read)){var sr = new StreamReader(cs, Encoding.UTF8);// /11/11 修改 读取全部内容，而不是只读第一行，此问题乃是算法的bugDecryptString = sr.ReadToEnd();// sr.ReadLine();}}dsp.Clear();return true;}catch (Exception e){return false;}}public static bool Crypt3DESToBase64(string CryptString, string Key, out string DecryptString){DecryptString = "";try{// encode to bytesbyte[] KEY = HexStringToByteArray(Key);byte[] CRYPTSTRING = System.Text.Encoding.UTF8.GetBytes(CryptString);//set iv and keybyte[] tmpiv = { 49, 50, 51, 52, 53, 54, 55, 56 };byte[] tmpkey = { 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7 };for (int ii = 0; ii < 24; ii++){tmpkey[ii] = KEY[ii];}TripleDESCryptoServiceProvider dsp = new TripleDESCryptoServiceProvider();dsp.Mode = System.Security.Cryptography.CipherMode.CBC;dsp.Padding = System.Security.Cryptography.PaddingMode.PKCS7;ICryptoTransform tridesencrypt = dsp.CreateEncryptor(tmpkey, tmpiv);byte[] results = tridesencrypt.TransformFinalBlock(CRYPTSTRING, 0, CRYPTSTRING.Length);DecryptString = Convert.ToBase64String(results);dsp.Clear();return true;}catch (Exception e){return false;}}public static byte[] HexStringToByteArray(string s){Byte[] buf = new byte[s.Length / 2];for (int i = 0; i < buf.Length; i++){buf[i] = (byte)(chr2hex(s.Substring(i * 2, 1)) * 0x10 + chr2hex(s.Substring(i * 2 + 1, 1)));}return buf;}private static byte chr2hex(string chr){switch (chr){case "0":return 0x00;case "1":return 0x01;case "2":return 0x02;case "3":return 0x03;case "4":return 0x04;case "5":return 0x05;case "6":return 0x06;case "7":return 0x07;case "8":return 0x08;case "9":return 0x09;case "A":return 0x0a;case "B":return 0x0b;case "C":return 0x0c;case "D":return 0x0d;case "E":return 0x0e;case "F":return 0x0f;}return 0x00;}
在以上算法中，key为一个48位的字符串，别的就没特别要注意的了。
RSA加密算法（根据MSDN文档实现）：
/// <summary>/// 使用rsa非对称加密算法加密文本内容/// </summary>/// <param name="contentBytes">待加密内容byte数组</param>/// <param name="publicKey">公开密钥</param>/// <param name="DoOAEPPadding">建议为false</param>/// <returns>加密后的byte[]</returns>public static byte[] RSAEncryptContent(byte[]contentBytes,RSAParameters publicKey,bool DoOAEPPadding){try{byte[] encryptedData;using (RSACryptoServiceProvider provider = new RSACryptoServiceProvider()){provider.ImportParameters(publicKey);encryptedData = provider.Encrypt(contentBytes, DoOAEPPadding);}return encryptedData;}catch (Exception e){return null;}}/// <summary>/// 使用rsa非对称加密算法进行解密/// </summary>/// <param name="cryptContentBytes">加密后的字节数组</param>/// <param name="privateKey">私有密钥</param>/// <param name="DoOAEPPadding">建议为false</param>/// <returns>解密后的内容数组</returns>public static byte[] RSADescryptContent(byte[]cryptContentBytes,RSAParameters privateKey,bool DoOAEPPadding){try{byte[] decryptData;using (RSACryptoServiceProvider provider = new RSACryptoServiceProvider()){provider.ImportParameters(privateKey);decryptData = provider.Decrypt(cryptContentBytes, DoOAEPPadding);}return decryptData;}catch (Exception e){Console.WriteLine(e.Message);return null;}}
使用RSA加密/解密算法的方法：
//content为要进行加密的字符串 byte[] contentBytes = byteConverter.GetBytes(content);byte[] encryptBytes;byte[] decryptBytes;//待加密的字节数不能超过密钥的长度值除以 8 再减去 11（即：RSACryptoServiceProvider.KeySize / 8 - 11）int maxBlockSize;using(RSACryptoServiceProvider provider=new RSACryptoServiceProvider()){maxBlockSize = provider.KeySize / 8 - 11;RSAParameters publicKey = provider.ExportParameters(false);// 小于最大块值，直接加密if (contentBytes.Length <= maxBlockSize){encryptBytes = EncryptContent(contentBytes, publicKey, false);}else{// 分块儿加密using(MemoryStream plaintStream=new MemoryStream(contentBytes))using(MemoryStream cryptStream=new MemoryStream()){byte[] buffer = new byte[maxBlockSize];int blockSize = plaintStream.Read(buffer, 0, maxBlockSize);while(blockSize>0){byte[] encryptBlock = new byte[blockSize];Array.Copy(buffer, encryptBlock, blockSize);byte[]encryptedBlock=EncryptContent(encryptBlock,publicKey,false);cryptStream.Write(encryptedBlock, 0, encryptedBlock.Length);blockSize = plaintStream.Read(buffer, 0, maxBlockSize);}encryptBytes = cryptStream.ToArray();}}//加密后的字符串string encryptString = byteConverter.GetString(encryptBytes);Console.WriteLine("加密结束");Console.ReadLine();Console.ReadLine(); // 以下为解密过程，解密过程也会有长度限制，可参考加密的方式进行解密//string encryptString = byteConverter.GetString(encryptBytes);//RSAParameters privateKey = provider.ExportParameters(true);//decryptBytes = DecryptContent(encryptBytes, privateKey, false);//string decryptString = byteConverter.GetString(decryptBytes);//Console.WriteLine(decryptString);}
