SymmetricAlgorithmHelper對稱式加密輔助類，支援DES，3DES，AES，RC2

標籤：

理論上只要繼承自SymmetricAlgorithm的對稱式加密演算法，該輔助類都支援加密解密，另外為了方便與JAVA互連，預設提供了ECB和CBC兩種加密模式、填充方式均為PKCS7的靜態方法

    using System.Security.Cryptography;    public class SymmetricAlgorithmHelper<T>        where T : SymmetricAlgorithm, new()    {        /// <summary>        /// 加密 ECB PKCS7模式        /// </summary>        /// <param name="str">要加密的資料</param>        /// <param name="key">秘鑰（base64格式）</param>        /// <returns>加密後的結果（base64格式）</returns>        public static string EncryptWithECB(string str, string key)        {            return EncryptWithECB(str, Convert.FromBase64String(key));        }        /// <summary>        /// 加密 ECB PKCS7模式        /// </summary>        /// <param name="str">要加密的資料</param>        /// <param name="key">秘鑰</param>        /// <returns>加密後的結果（base64格式）</returns>        public static string EncryptWithECB(string str, byte[] key)        {            var toEncryptArray = Encoding.UTF8.GetBytes(str);            return Convert.ToBase64String(Encrypt(toEncryptArray, key, null, CipherMode.ECB, PaddingMode.PKCS7));        }        /// <summary>        /// 解密 ECB PKCS7模式        /// </summary>        /// <param name="str">要解密的資料（base64格式）</param>        /// <param name="key">秘鑰（base64格式）</param>        /// <returns>utf-8編碼返回解密後得資料</returns>        public static string DecryptWithECB(string str, string key)        {            return DecryptWithECB(str, Convert.FromBase64String(key));        }        /// <summary>        ///  3DES 解密 ECB PKCS7模式        /// </summary>        /// <param name="str">要解密的資料（base64格式）</param>        /// <param name="key">秘鑰</param>        /// <returns>utf-8編碼返回解密後得資料</returns>        public static string DecryptWithECB(string str, byte[] key)        {            var toDecryptArray = Convert.FromBase64String(str);            return Encoding.UTF8.GetString(Decrypt(toDecryptArray, key, null, CipherMode.ECB, PaddingMode.PKCS7));        }        /// <summary>        /// 加密 CBC PKCS7模式        /// </summary>        /// <param name="str">要加密的資料</param>        /// <param name="key">秘鑰（base64格式）</param>        /// <param name="iv">向量（base64格式）</param>        /// <returns>加密後的結果（base64格式）</returns>        public static string EncryptWithCBC(string str, string key, string iv)        {            return EncryptWithCBC(str, Convert.FromBase64String(key), Convert.FromBase64String(iv));        }        /// <summary>        /// 加密 CBC PKCS7模式        /// </summary>        /// <param name="str">要加密的資料</param>        /// <param name="key">秘鑰</param>        /// <param name="iv">向量</param>        /// <returns>加密後的結果（base64格式）</returns>        public static string EncryptWithCBC(string str, byte[] key, byte[] iv)        {            var toEncryptArray = Encoding.UTF8.GetBytes(str);            return Convert.ToBase64String(Encrypt(toEncryptArray, key, iv, CipherMode.CBC, PaddingMode.PKCS7));        }        /// <summary>        /// 解密 CBC PKCS7模式        /// </summary>        /// <param name="str">要解密的資料（base64格式）</param>        /// <param name="key">秘鑰（base64格式）</param>        /// <param name="iv">向量（base64格式）</param>        /// <returns>utf-8編碼返回解密後得資料</returns>        public static string DecryptWithCBC(string str, string key, string iv)        {            return DecryptWithCBC(str, Convert.FromBase64String(key), Convert.FromBase64String(iv));        }        /// <summary>        ///  解密 CBC PKCS7模式        /// </summary>        /// <param name="str">要解密的資料（base64格式）</param>        /// <param name="key">秘鑰</param>        /// <param name="iv">向量</param>        /// <returns>utf-8編碼返回解密後得資料</returns>        public static string DecryptWithCBC(string str, byte[] key, byte[] iv)        {            var toDecryptArray = Convert.FromBase64String(str);            return Encoding.UTF8.GetString(Decrypt(toDecryptArray, key, iv, CipherMode.CBC, PaddingMode.PKCS7));        }        /// <summary>        /// 加密        /// </summary>        /// <param name="data">要加密的資料</param>        /// <param name="key">秘鑰</param>        /// <param name="iv">向量</param>        /// <param name="cipherMode">塊模式</param>        /// <param name="paddingMode">填充模式</param>        /// <returns>加密後得到的數組</returns>        public static byte[] Encrypt(byte[] data, byte[] key, byte[] iv, CipherMode cipherMode, PaddingMode paddingMode)        {            return Transform(data, cipherMode, paddingMode, algorithm => algorithm.CreateEncryptor(key, iv));        }        /// <summary>        /// 解密        /// </summary>        /// <param name="data">要解密的資料</param>        /// <param name="key">秘鑰</param>        /// <param name="iv">向量</param>        /// <param name="cipherMode">塊模式</param>        /// <param name="paddingMode">填充模式</param>        /// <returns>解密後的到的數組</returns>        public static byte[] Decrypt(byte[] data, byte[] key, byte[] iv, CipherMode cipherMode, PaddingMode paddingMode)        {            return Transform(data, cipherMode, paddingMode, algorithm => algorithm.CreateDecryptor(key, iv));        }        private static byte[] Transform(byte[] data, CipherMode cipherMode, PaddingMode paddingMode, Func<T, ICryptoTransform> func)        {            using (T algorithm = new T            {                Mode = cipherMode,                Padding = paddingMode            })            {                using (ICryptoTransform cTransform = func(algorithm))                {                    return cTransform.TransformFinalBlock(data, 0, data.Length);                }            }        }        /// <summary>        /// 產生秘鑰        /// </summary>        /// <param name="key">秘鑰(base64格式)</param>        /// <param name="iv">iv向量(base64格式)</param>        /// <param name="keySize">要產生的KeySize</param>        public static void Create(out string key, out string iv, int keySize)        {            KeyGenerator.CreateSymmetricAlgorithmKey<T>(out key, out iv, keySize);        }    }    public class TripleDESHelper : SymmetricAlgorithmHelper<TripleDESCryptoServiceProvider>    {        /// <summary>        /// 產生秘鑰        /// </summary>        /// <param name="key">秘鑰(base64格式)</param>        /// <param name="iv">iv向量(base64格式)</param>        /// <param name="keySize">要產生的KeySize，只支援128、192</param>        public static new void Create(out string key, out string iv, int keySize = 192)        {            KeyGenerator.CreateSymmetricAlgorithmKey<TripleDESCryptoServiceProvider>(out key, out iv, keySize);        }    }    public class AESHelper : SymmetricAlgorithmHelper<AesCryptoServiceProvider>//RijndaelManaged    {        /// <summary>        /// 產生秘鑰        /// </summary>        /// <param name="key">秘鑰(base64格式)</param>        /// <param name="iv">iv向量(base64格式)</param>        /// <param name="keySize">要產生的KeySize，只支援128、192、256，java一般產生的秘鑰長度為128，所以這裡預設也採用128</param>        public static new void Create(out string key, out string iv, int keySize = 128)        {            KeyGenerator.CreateSymmetricAlgorithmKey<AesCryptoServiceProvider>(out key, out iv, keySize);        }    }    public class DESHelper : SymmetricAlgorithmHelper<DESCryptoServiceProvider>    {        /// <summary>        /// 產生秘鑰        /// </summary>        /// <param name="key">秘鑰(base64格式)</param>        /// <param name="iv">iv向量(base64格式)</param>        /// <param name="keySize">要產生的KeySize，DES只支援64，所以此處切勿傳其它值</param>        public static new void Create(out string key, out string iv, int keySize = 64)        {            KeyGenerator.CreateSymmetricAlgorithmKey<DESCryptoServiceProvider>(out key, out iv, keySize);        }    }    public class RC2Helper : SymmetricAlgorithmHelper<RC2CryptoServiceProvider>    {        /// <summary>        /// 產生秘鑰        /// </summary>        /// <param name="key">秘鑰(base64格式)</param>        /// <param name="iv">iv向量(base64格式)</param>        /// <param name="keySize">要產生的KeySize，支援的MinSize:40 MaxSize:128 SkipSize:8</param>        public static new void Create(out string key, out string iv, int keySize = 96)        {            KeyGenerator.CreateSymmetricAlgorithmKey<RC2CryptoServiceProvider>(out key, out iv, keySize);        }    }

因為每種加密方式對Key長度的支援不一樣，所以除SymmetricAlgorithmHelper外，還通過繼承的方式覆蓋了建立秘鑰的Create方法，分別為TripleDESHelper、AESHelper、DESHelper、RC2Helper，KeyGenerator的代碼在這裡，而測試代碼如下

        static void SymmetricAlgorithmDemo<T>(int keySize = 128)            where T : SymmetricAlgorithm, new()        {            string key, iv;            SymmetricAlgorithmHelper<T>.Create(out key, out iv, keySize);            Console.WriteLine("Key:" + key);            Console.WriteLine("IV:" + iv);            SymmetricAlgorithmDemo<T>(key, iv);        }        static void SymmetricAlgorithmDemo<T>(string key, string iv)            where T : SymmetricAlgorithm, new()        {            string content = "測試資料";            string name = typeof(T).Name;            string encTxt = SymmetricAlgorithmHelper<T>.EncryptWithECB(content, key);            Console.WriteLine(name + " ECB PKCS7加密結果：" + encTxt);            Console.WriteLine(name + " ECB PKCS7解密結果：" + SymmetricAlgorithmHelper<T>.DecryptWithECB(encTxt, key));            encTxt = SymmetricAlgorithmHelper<T>.EncryptWithCBC(content, key, iv);            Console.WriteLine(name + " CBC PKCS7加密結果：" + encTxt);            Console.WriteLine(name + " CBC PKCS7解密結果：" + SymmetricAlgorithmHelper<T>.DecryptWithCBC(encTxt, key, iv));            encTxt = Convert.ToBase64String(SymmetricAlgorithmHelper<T>.Encrypt(Encoding.UTF8.GetBytes(content), Convert.FromBase64String(key), Convert.FromBase64String(iv), CipherMode.CFB, PaddingMode.Zeros));            Console.WriteLine(name + " CFB Zeros加密結果：" + encTxt);            Console.WriteLine(name + " CFB Zeros解密結果：" + Encoding.UTF8.GetString(SymmetricAlgorithmHelper<T>.Decrypt(Convert.FromBase64String(encTxt), Convert.FromBase64String(key), Convert.FromBase64String(iv), CipherMode.CFB, PaddingMode.Zeros)));        }        static void Main(string[] args)        {            SymmetricAlgorithmDemo<TripleDESCryptoServiceProvider>();            SymmetricAlgorithmDemo<AesCryptoServiceProvider>();            SymmetricAlgorithmDemo<RijndaelManaged>();//AES            SymmetricAlgorithmDemo<DESCryptoServiceProvider>(64);            SymmetricAlgorithmDemo<RC2CryptoServiceProvider>();            string key, iv;            SymmetricAlgorithmHelper<RijndaelManaged>.Create(out key, out iv, 256);            Console.WriteLine("Key:" + key);            Console.WriteLine("IV:" + iv);            //驗證AesCryptoServiceProvider和RijndaelManaged加密結果是否一致            SymmetricAlgorithmDemo<AesCryptoServiceProvider>(key, iv);            SymmetricAlgorithmDemo<RijndaelManaged>(key, iv);//AES            //測試AESHelper加密結果是否與上面一致            string encTxt = AESHelper.EncryptWithECB("測試資料", key);            Console.WriteLine("AESHelper ECB PKCS7加密結果：" + encTxt);            Console.WriteLine("AESHelper ECB PKCS7解密結果：" + AESHelper.DecryptWithECB(encTxt, key));        }

SymmetricAlgorithmHelper對稱式加密輔助類，支援DES，3DES，AES，RC2