加密算法DES
Posted weiweixiang
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这里不讲原理，只有实现的简单封装
/// <summary> /// DES加密解密类 /// /// </summary> public class DesHelper { private static readonly string _Key = "[email protected]#Swg68"; private static readonly string _Vector = "[email protected]"; /// <summary> /// DES加密 /// 密码：默认 /// 偏移量：默认 /// 模式：CBC /// 填充：PKCS7 /// 输出：Base64 /// 编码：UTF8 /// </summary> /// <param name="plaintext">明文</param> /// <returns>大写的密文</returns> public static string Encrypt(string plaintext) { return Encrypt(plaintext, _Key, _Vector, OutputMethod.Base64, CipherMode.CBC, PaddingMode.PKCS7); } /// <summary> /// DES加密 /// 密码：默认 /// 偏移量：默认 /// 模式：CBC /// 填充：PKCS7 /// 输出：自定义 /// 编码：UTF8 /// </summary> /// <param name="plaintext">明文</param> /// <returns>大写的密文</returns> public static string Encrypt(string plaintext, OutputMethod method) { return Encrypt(plaintext, _Key, _Vector, method, CipherMode.CBC, PaddingMode.PKCS7); } /// <summary> /// DES加密 /// 密码：自定义 /// 偏移量：自定义 /// 模式：CBC /// 填充：PKCS7 /// 输出：Base64 /// 编码：UTF8 /// </summary> /// <param name="plaintext">明文</param> /// <param name="key">密码，8位，不含中文</param> /// <param name="iv">偏移量，8位，不含中文</param> /// <returns></returns> public static string Encrypt(string plaintext, string key, string iv) { return Encrypt(plaintext, key, iv, OutputMethod.Base64, CipherMode.CBC, PaddingMode.PKCS7); } /// <summary> /// DES加密 /// 密码：自定义 /// 偏移量：自定义 /// 输出：自定义 /// 模式：CBC /// 填充：PKCS7 /// 编码：UTF8 /// </summary> /// <param name="plaintext"></param> /// <param name="key"></param> /// <param name="iv"></param> /// <param name="method"></param> /// <returns></returns> public static string Encrypt(string plaintext, string key, string iv, OutputMethod method) { return Encrypt(plaintext, key, iv, method, CipherMode.CBC, PaddingMode.PKCS7); } /// <summary> /// DES加密 /// 密码：自定义 /// 偏移量：自定义 /// 模式：自定义 /// 填充：自定义 /// 输出：自定义 /// 编码：UTF8 /// </summary> /// <param name="plaintext">明文</param> /// <param name="key">密码，8位，不含中文</param> /// <param name="iv">偏移量，8位，不含中文</param> /// <param name="method">输出</param> /// <param name="cipher">加密模式</param> /// <param name="padding">填充</param> /// <returns></returns> public static string Encrypt(string plaintext, string key, string iv, OutputMethod method, CipherMode cipher, PaddingMode padding) { if (String.IsNullOrEmpty(plaintext)) { throw new ArgumentNullException("明文不能为空"); } if (String.IsNullOrEmpty(key) || key.Length != 8) { throw new ArgumentNullException("密钥参数错误"); } if (String.IsNullOrEmpty(iv) || key.Length != 8) { throw new ArgumentNullException("向量参数错误"); } byte[] byteArray = Encoding.UTF8.GetBytes(plaintext); DESCryptoServiceProvider provider = new DESCryptoServiceProvider(); provider.Key = Encoding.ASCII.GetBytes(key); provider.IV = Encoding.ASCII.GetBytes(iv); provider.Mode = cipher; provider.Padding = padding; using (MemoryStream ms = new MemoryStream()) { CryptoStream cStream = new CryptoStream(ms, provider.CreateEncryptor(), CryptoStreamMode.Write); cStream.Write(byteArray, 0, byteArray.Length); cStream.FlushFinalBlock(); byte[] result = ms.ToArray(); return EadUtil.Output(result, method); } } /// <summary> /// DES解密 输出编码必须跟加密的输出编码一致 /// 密码：默认 /// 偏移量：默认 /// 模式：CBC /// 填充：PKCS7 /// 编码：UTF8 /// </summary> /// <param name="ciphertext">密文</param> /// <returns>返回明文</returns> public static string Decrypt(string ciphertext) { return Decrypt(ciphertext, _Key, _Vector, OutputMethod.Base64, CipherMode.CBC, PaddingMode.PKCS7); } /// <summary> /// DES解密 输出编码必须跟加密的输出编码一致 /// 密码：默认 /// 偏移量：默认 /// 模式：CBC /// 填充：PKCS7 /// 编码：UTF8 /// </summary> /// <param name="ciphertext">密文</param> /// <returns>返回明文</returns> public static string Decrypt(string ciphertext, OutputMethod method) { return Decrypt(ciphertext, _Key, _Vector, method, CipherMode.CBC, PaddingMode.PKCS7); } /// <summary> /// DES解密 输出编码必须跟加密的输出编码一致 /// 密码：自定义 /// 偏移量：自定义 /// 模式：CBC /// 填充：PKCS7 /// 编码：UTF8 /// </summary> /// <param name="ciphertext">密文</param> /// <param name="key">密码，8位，不含中文</param> /// <param name="iv">偏移量，8位，不含中文</param> /// <returns>返回明文</returns> public static string Decrypt(string ciphertext, string key, string iv) { return Decrypt(ciphertext, key, iv, OutputMethod.Base64, CipherMode.CBC, PaddingMode.PKCS7); } /// <summary> /// DES解密 /// </summary> /// <param name="ciphertext"></param> /// <param name="key"></param> /// <param name="iv"></param> /// <param name="method"></param> /// <returns></returns> public static string Decrypt(string ciphertext, string key, string iv, OutputMethod method) { return Decrypt(ciphertext, key, iv, method, CipherMode.CBC, PaddingMode.PKCS7); } /// <summary> /// DES解密 输出编码必须跟加密的输出编码一致 /// 密码：自定义 /// 偏移量：自定义 /// 模式：自定义 /// 填充：自定义 /// 编码：UTF8 /// </summary> /// <param name="ciphertext">密文</param> /// <param name="key">密码，8位，不含中文</param> /// <param name="iv">偏移量，8位，不含中文</param> /// <param name="cipher">加密模式</param> /// <param name="padding">填充</param> /// <returns>返回明文</returns> public static string Decrypt(string ciphertext, string key, string iv, OutputMethod method, CipherMode cipher, PaddingMode padding) { if (String.IsNullOrEmpty(ciphertext)) { throw new ArgumentNullException("密文不能为空"); } if (String.IsNullOrEmpty(key) || key.Length != 8) { throw new ArgumentNullException("密钥参数错误"); } if (String.IsNullOrEmpty(iv) || key.Length != 8) { throw new ArgumentNullException("向量参数错误"); } byte[] buffer = EadUtil.Input(ciphertext, method); DESCryptoServiceProvider provider = new DESCryptoServiceProvider(); provider.Key = Encoding.ASCII.GetBytes(key); provider.IV = Encoding.ASCII.GetBytes(iv); provider.Mode = cipher; provider.Padding = padding; using (MemoryStream ms = new MemoryStream()) { CryptoStream stream2 = new CryptoStream(ms, provider.CreateDecryptor(), CryptoStreamMode.Write); stream2.Write(buffer, 0, buffer.Length); stream2.FlushFinalBlock(); ms.Close(); return Encoding.GetEncoding("UTF-8").GetString(ms.ToArray()); } } }
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