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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,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,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,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,Buffer.Length)) > 0)
{
originalMemory.Write(Buffer,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,// 82,200,242
//};
public static byte[] Decrypt(byte[] encryptedBytes,byte[] key)
{
MemoryStream mStream = new MemoryStream( encryptedBytes );
//mStream.Write( encryptedBytes,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,encryptedBytes.Length + 32 );
byte[] ret = new byte[ len ];
Array.Copy( tmp,ret,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,plainBytes.Length);
cryptoStream.FlushFinalBlock();
return mStream.ToArray();
}
finally
{
cryptoStream.Close();
mStream.Close();
aes.Clear();
}
}
}
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