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using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;
namespace SWSoft.IO
{
/// <summary>
/// DES数据加密标准算法由于密钥长度较小(56位),已经不适应当今分布式开放网络对数据加密安全性的要求,
/// 因此1997年NIST公开征集新的数据加密标准,即AES。经过三轮的筛选,比利时Joan Daeman和Vincent Rijmen
/// 提交的Rijndael算法被提议为AES的最终算法。此算法将成为美国新的数据加密标准而被广泛应用在各个领域中。
/// 尽管人们对AES还有不同的看法,但总体来说,AES作为新一代的数据加密标准汇聚了强安全性、高性能、高效率、
/// 易用和灵活等优点。AES设计有三个密钥长度:128,192,256位,相对而言,AES的128密钥比DES的56密钥强1021倍。
/// </summary>
public class AES
{
/// <summary>
/// AES加密
/// </summary>
/// <param name="Data">需要加密的明文-byte[]</param>
/// <param name="Key">密钥</param>
/// <param name="Vector">向量</param>
/// <returns>密文</returns>
public static Byte[] Encrypt(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加密
/// </summary>
/// <param name="Data">需要加密的明文-string</param>
/// <param name="Key">密钥</param>
/// <param name="Vector">向量</param>
/// <returns>密文</returns>
public static string Encrypt(string Data, String Key, String Vector)
{
byte[] byte0 = MyData.ToBytes(Data);//转换成byte[]
byte[] byte1 = Encrypt(byte0, Key, Vector);//加密成byte[]
return MyData.toHexString(byte1);//转换成16进制字符串
}
/// <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[] Decrypt(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;
}
/// <summary>
/// AES解密
/// </summary>
/// <param name="Data">需要解密的明文-string</param>
/// <param name="Key">密钥</param>
/// <param name="Vector">向量</param>
/// <returns>明文</returns>
public static string Decrypt(string Data, String Key, String Vector)
{
try
{
byte[] byte0 = MyData.ToHexBytes(Data);//将16进制字符串转换成byte[]
byte[] byte1 = Decrypt(byte0, Key, Vector);//解密成byte[]
return UTF8Encoding.UTF8.GetString(byte1);//还原成字符串
}
catch (Exception)
{
return null;
}
}
}
public class MyData
{
public static byte[] ToHexBytes(string data)
{
if (data != null && data.Length > 0)
{
byte[] bytes = new byte[data.Length % 2 == 0 ? data.Length / 2 : data.Length - 1];
for (int i = 0, j = 0; i < data.Length; i += 2, j++)
{
bytes[j] = byte.Parse(data.Substring(i, 2), System.Globalization.NumberStyles.AllowHexSpecifier);
}
return bytes;
}
return null;
}
public static byte[] ToBytes(string data)
{
if (data != null && data.Length > 0)
{
return UTF8Encoding.UTF8.GetBytes(data);
}
return null;
}
/// <summary>
/// 转换成16进制字符串
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public static string toHexString(byte[] data)
{
if (data != null)
{
string hex = string.Empty;
for (int i = 0; i < data.Length; i++)
{
hex += data[i].ToString("X2");
}
return hex;
}
return null;
}
}
}