using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Security.Cryptography; using System.IO; namespace AESDemo { public static 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 Byte[] AESEncrypt(Byte[] Data, String Key, String Vector) { 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(Data, 0, Data.Length); Encryptor.FlushFinalBlock(); Cryptograph = Memory.ToArray(); } } } catch { Cryptograph = null; } return 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 Byte[] AESDecrypt(Byte[] Data, String Key, String Vector) { 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(Data)) { // 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 original; } } } 不使用向量的方式： public static class AESCrypto { /// <summary> /// IV向量为固定值 /// </summary> //private static byte[] _iV = { // 85, 60, 12, 116, // 99, 189, 173, 19, // 138, 183, 232, 248, // 82, 232, 200, 242 //}; public static byte[] Decrypt(byte[] encryptedBytes, byte[] key) { 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 = key; //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 ret; } finally { cryptoStream.Close( ); mStream.Close( ); aes.Clear( ); } } public static byte[] Encrypt(byte[] plainBytes, byte[] key) { MemoryStream mStream = new MemoryStream(); RijndaelManaged aes = new RijndaelManaged(); aes.Mode = CipherMode.ECB; aes.Padding = PaddingMode.PKCS7; aes.KeySize = 128; //aes.Key = _key; aes.Key = key; //aes.IV = _iV; CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateEncryptor(), CryptoStreamMode.Write); try { cryptoStream.Write(plainBytes, 0, plainBytes.Length); cryptoStream.FlushFinalBlock(); return mStream.ToArray(); } finally { cryptoStream.Close(); mStream.Close(); aes.Clear(); } } }
