C#实现AES加密解密

AES算法描述简介：

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>

/// 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;

}