C#实现AES加解密方法
作者:@nele
本文为作者原创,转载请注明出处:https://www.cnblogs.com/nele/p/4976379.html
目录
using System; using System.Collections.Generic; using System.Text; using System.Security.Cryptography; using System.IO; namespace Csharp { class AESHelper { /// <summary> /// AES加密 /// </summary> /// <param name="Data">被加密的明文</param> /// <param name="Key">密钥</param> /// <param name="Vector">向量</param> /// <returns>密文</returns> public static String AESEncrypt(String Data, String Key, String Vector) { Byte[] plainBytes = Encoding.UTF8.GetBytes(Data); Byte[] bKey = new Byte[32]; Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length); Byte[] bVector = new Byte[16]; Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length); Byte[] Cryptograph = null; // 加密后的密文 Rijndael Aes = Rijndael.Create(); try { // 开辟一块内存流 using (MemoryStream Memory = new MemoryStream()) { // 把内存流对象包装成加密流对象 using (CryptoStream Encryptor = new CryptoStream(Memory, Aes.CreateEncryptor(bKey, bVector), CryptoStreamMode.Write)) { // 明文数据写入加密流 Encryptor.Write(plainBytes, 0, plainBytes.Length); Encryptor.FlushFinalBlock(); Cryptograph = Memory.ToArray(); } } } catch { Cryptograph = null; } return Convert.ToBase64String(Cryptograph); } /// <summary> /// AES解密 /// </summary> /// <param name="Data">被解密的密文</param> /// <param name="Key">密钥</param> /// <param name="Vector">向量</param> /// <returns>明文</returns> public static String AESDecrypt(String Data, String Key, String Vector) { Byte[] encryptedBytes = Convert.FromBase64String(Data); Byte[] bKey = new Byte[32]; Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length); Byte[] bVector = new Byte[16]; Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length); Byte[] original = null; // 解密后的明文 Rijndael Aes = Rijndael.Create(); try { // 开辟一块内存流,存储密文 using (MemoryStream Memory = new MemoryStream(encryptedBytes)) { // 把内存流对象包装成加密流对象 using (CryptoStream Decryptor = new CryptoStream(Memory, Aes.CreateDecryptor(bKey, bVector), CryptoStreamMode.Read)) { // 明文存储区 using (MemoryStream originalMemory = new MemoryStream()) { Byte[] Buffer = new Byte[1024]; Int32 readBytes = 0; while ((readBytes = Decryptor.Read(Buffer, 0, Buffer.Length)) > 0) { originalMemory.Write(Buffer, 0, readBytes); } original = originalMemory.ToArray(); } } } } catch { original = null; } return Encoding.UTF8.GetString(original); } /// <summary> /// AES加密(无向量) /// </summary> /// <param name="plainBytes">被加密的明文</param> /// <param name="key">密钥</param> /// <returns>密文</returns> public static string AESEncrypt(String Data, String Key) { MemoryStream mStream = new MemoryStream(); RijndaelManaged aes = new RijndaelManaged(); byte[] plainBytes = Encoding.UTF8.GetBytes(Data); Byte[] bKey = new Byte[32]; Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length); aes.Mode = CipherMode.ECB; aes.Padding = PaddingMode.PKCS7; aes.KeySize = 128; //aes.Key = _key; aes.Key = bKey; //aes.IV = _iV; CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateEncryptor(), CryptoStreamMode.Write); try { cryptoStream.Write(plainBytes, 0, plainBytes.Length); cryptoStream.FlushFinalBlock(); return Convert.ToBase64String(mStream.ToArray()); } finally { cryptoStream.Close(); mStream.Close(); aes.Clear(); } } /// <summary> /// AES解密(无向量) /// </summary> /// <param name="encryptedBytes">被加密的明文</param> /// <param name="key">密钥</param> /// <returns>明文</returns> public static string AESDecrypt(String Data, String Key) { Byte[] encryptedBytes = Convert.FromBase64String(Data); Byte[] bKey = new Byte[32]; Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length); MemoryStream mStream = new MemoryStream(encryptedBytes); //mStream.Write( encryptedBytes, 0, encryptedBytes.Length ); //mStream.Seek( 0, SeekOrigin.Begin ); RijndaelManaged aes = new RijndaelManaged(); aes.Mode = CipherMode.ECB; aes.Padding = PaddingMode.PKCS7; aes.KeySize = 128; aes.Key = bKey; //aes.IV = _iV; CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateDecryptor(), CryptoStreamMode.Read); try { byte[] tmp = new byte[encryptedBytes.Length + 32]; int len = cryptoStream.Read(tmp, 0, encryptedBytes.Length + 32); byte[] ret = new byte[len]; Array.Copy(tmp, 0, ret, 0, len); return Encoding.UTF8.GetString(ret); } finally { cryptoStream.Close(); mStream.Close(); aes.Clear(); } } } }
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