加密算法AES
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这里不讲原理,只有实现的简单封装
/// <summary> /// AES加解密 /// </summary> public class AesHelper { //默认密钥、初始化向量 private static readonly string _Key = "Q3zmD8v^LWYu5QsX"; private static readonly string _Vector = "figQi#gxIxqcnaKr"; /// <summary> /// AES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> /// AES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> /// AES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,16位,不含中文</param> /// <param name="iv">偏移量,16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> /// AES加密 /// 密码:自定义 /// 偏移量:自定义 /// 模式:CBC /// 填充:PKCS7 /// 输出:自定义 /// 编码:UTF8 /// </summary> /// <param name="plaintext">明文</param> /// <param name="key">密码,16位,不含中文</param> /// <param name="iv">偏移量,16位,不含中文</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> /// AES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,16位,不含中文</param> /// <param name="iv">偏移量,16位,不含中文</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 != 16) { throw new ArgumentNullException("密钥参数错误"); } if (String.IsNullOrEmpty(iv) || key.Length != 16) { throw new ArgumentNullException("向量参数错误"); } byte[] byteArray = Encoding.UTF8.GetBytes(plaintext); Rijndael rjd = Rijndael.Create(); rjd.Key = Encoding.ASCII.GetBytes(key); rjd.IV = Encoding.ASCII.GetBytes(iv); rjd.Mode = cipher; rjd.Padding = padding; using (MemoryStream ms = new MemoryStream()) { CryptoStream cStream = new CryptoStream(ms, rjd.CreateEncryptor(), CryptoStreamMode.Write); cStream.Write(byteArray, 0, byteArray.Length); cStream.FlushFinalBlock(); byte[] result = ms.ToArray(); return EadUtil.Output(result, method); } } /// <summary> /// AES解密 /// 密码:默认 /// 偏移量:默认 /// 模式:CBC /// 填充:PKCS7 /// 编码:UTF8 /// </summary> /// <param name="plaintext">密文</param> /// <returns>返回明文</returns> public static string Decrypt(string plaintext) { return Decrypt(plaintext, _Key, _Vector, OutputMethod.Base64, CipherMode.CBC, PaddingMode.PKCS7); } /// <summary> /// AES解密 /// 密码:默认 /// 偏移量:默认 /// 模式:CBC /// 填充:PKCS7 /// 编码:UTF8 /// </summary> /// <param name="plaintext">密文</param> /// <returns>返回明文</returns> public static string Decrypt(string plaintext, OutputMethod method) { return Decrypt(plaintext, _Key, _Vector, method, CipherMode.CBC, PaddingMode.PKCS7); } /// <summary> /// AES解密 /// 密码:自定义 /// 偏移量:自定义 /// 模式:CBC /// 填充:PKCS7 /// 编码:UTF8 /// </summary> /// <param name="plaintext">密文</param> /// <param name="key">密码,8位,不含中文</param> /// <param name="iv">偏移量,16位,不含中文</param> /// <returns></returns> public static string Decrypt(string plaintext, string key, string iv) { return Decrypt(plaintext, key, iv, OutputMethod.Base64, CipherMode.CBC, PaddingMode.PKCS7); } /// <summary> /// AES解密 /// 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,16位,不含中文</param> /// <param name="cipher">加密模式</param> /// <param name="padding">填充</param> /// <returns></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 != 16) { throw new ArgumentNullException("密钥参数错误"); } if (String.IsNullOrEmpty(iv) || key.Length != 16) { throw new ArgumentNullException("向量参数错误"); } byte[] buffer = EadUtil.Input(ciphertext, method); Rijndael aes = Rijndael.Create(); aes.Key = Encoding.ASCII.GetBytes(key); aes.IV = Encoding.ASCII.GetBytes(iv); aes.Mode = cipher; aes.Padding = padding; using (MemoryStream ms = new MemoryStream()) { CryptoStream cStream = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Write); cStream.Write(buffer, 0, buffer.Length); cStream.FlushFinalBlock(); ms.Close(); return Encoding.UTF8.GetString(ms.ToArray()); } } }
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