C# 3DES加密解密，差点要了命
最近 一个项目.net 数据采用3DES加密。
下面分享一下，
这里的KEY采用Base64编码，便用分发，c#的Byte范围是0-255
核心是确定Mode和Padding，关于这两个的意思可以搜索3DES算法相关文章
一个是C#采用CBC Mode，PKCS7 Padding
另一个是C#采用ECB Mode，PKCS7 Padding
对字符加密时，采用的是UTF-8编码
下面是C#代码
/// <summary> /// DES3加密解密 /// </summary> public class Des3 { #region CBC模式** /// <summary> /// DES3 CBC模式加密 /// </summary> /// <param name="key">密钥</param> /// <param name="iv">IV</param> /// <param name="data">明文的byte数组</param> /// <returns>密文的byte数组</returns> public static byte[] Des3EncodeCBC(byte[] key, byte[] iv, byte[] data) { //复制于MSDN try { // Create a MemoryStream. MemoryStream mStream = new MemoryStream(); TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider(); tdsp.Mode = CipherMode.CBC; //默认值 tdsp.Padding = PaddingMode.PKCS7; //默认值 // Create a CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream cStream = new CryptoStream(mStream, tdsp.CreateEncryptor(key, iv), CryptoStreamMode.Write); // Write the byte array to the crypto stream and flush it. cStream.Write(data, 0, data.Length); cStream.FlushFinalBlock(); // Get an array of bytes from the // MemoryStream that holds the // encrypted data. byte[] ret = mStream.ToArray(); // Close the streams. cStream.Close(); mStream.Close(); // Return the encrypted buffer. return ret; } catch (CryptographicException e) { Console.WriteLine("A Cryptographic error occurred: {0}", e.Message); return null; } } /// <summary> /// DES3 CBC模式解密 /// </summary> /// <param name="key">密钥</param> /// <param name="iv">IV</param> /// <param name="data">密文的byte数组</param> /// <returns>明文的byte数组</returns> public static byte[] Des3DecodeCBC(byte[] key, byte[] iv, byte[] data) { try { // Create a new MemoryStream using the passed // array of encrypted data. MemoryStream msDecrypt = new MemoryStream(data); TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider(); tdsp.Mode = CipherMode.CBC; tdsp.Padding = PaddingMode.PKCS7; // Create a CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream csDecrypt = new CryptoStream(msDecrypt, tdsp.CreateDecryptor(key, iv), CryptoStreamMode.Read); // Create buffer to hold the decrypted data. byte[] fromEncrypt = new byte[data.Length]; // Read the decrypted data out of the crypto stream // and place it into the temporary buffer. csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length); //Convert the buffer into a string and return it. return fromEncrypt; } catch (CryptographicException e) { Console.WriteLine("A Cryptographic error occurred: {0}", e.Message); return null; } } #endregion #region ECB模式 /// <summary> /// DES3 ECB模式加密 /// </summary> /// <param name="key">密钥</param> /// <param name="iv">IV(当模式为ECB时，IV无用)</param> /// <param name="str">明文的byte数组</param> /// <returns>密文的byte数组</returns> public static byte[] Des3EncodeECB(byte[] key, byte[] iv, byte[] data) { try { // Create a MemoryStream. MemoryStream mStream = new MemoryStream(); TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider(); tdsp.Mode = CipherMode.ECB; tdsp.Padding = PaddingMode.PKCS7; // Create a CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream cStream = new CryptoStream(mStream, tdsp.CreateEncryptor(key, iv), CryptoStreamMode.Write); // Write the byte array to the crypto stream and flush it. cStream.Write(data, 0, data.Length); cStream.FlushFinalBlock(); // Get an array of bytes from the // MemoryStream that holds the // encrypted data. byte[] ret = mStream.ToArray(); // Close the streams. cStream.Close(); mStream.Close(); // Return the encrypted buffer. return ret; } catch (CryptographicException e) { Console.WriteLine("A Cryptographic error occurred: {0}", e.Message); return null; } } /// <summary> /// DES3 ECB模式解密 /// </summary> /// <param name="key">密钥</param> /// <param name="iv">IV(当模式为ECB时，IV无用)</param> /// <param name="str">密文的byte数组</param> /// <returns>明文的byte数组</returns> public static byte[] Des3DecodeECB(byte[] key, byte[] iv, byte[] data) { try { // Create a new MemoryStream using the passed // array of encrypted data. MemoryStream msDecrypt = new MemoryStream(data); TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider(); tdsp.Mode = CipherMode.ECB; tdsp.Padding = PaddingMode.PKCS7; // Create a CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream csDecrypt = new CryptoStream(msDecrypt, tdsp.CreateDecryptor(key, iv), CryptoStreamMode.Read); // Create buffer to hold the decrypted data. byte[] fromEncrypt = new byte[data.Length]; // Read the decrypted data out of the crypto stream // and place it into the temporary buffer. csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length); //Convert the buffer into a string and return it. return fromEncrypt; } catch (CryptographicException e) { Console.WriteLine("A Cryptographic error occurred: {0}", e.Message); return null; } } #endregion /// <summary> /// 类测试 /// </summary> public static void Test() { System.Text.Encoding utf8 = System.Text.Encoding.UTF8; //key为abcdefghijklmnopqrstuvwx的Base64编码 byte[] key = Convert.FromBase64String("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4"); byte[] iv = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }; //当模式为ECB时，IV无用 byte[] data = utf8.GetBytes("中国ABCabc123"); System.Console.WriteLine("ECB模式:"); byte[] str1 = Des3.Des3EncodeECB(key, iv, data); byte[] str2 = Des3.Des3DecodeECB(key, iv, str1); System.Console.WriteLine(Convert.ToBase64String(str1)); System.Console.WriteLine(System.Text.Encoding.UTF8.GetString(str2)); System.Console.WriteLine(); System.Console.WriteLine("CBC模式:"); byte[] str3 = Des3.Des3EncodeCBC(key, iv, data); byte[] str4 = Des3.Des3DecodeCBC(key, iv, str3); System.Console.WriteLine(Convert.ToBase64String(str3)); System.Console.WriteLine(utf8.GetString(str4)); System.Console.WriteLine(); } }
