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DES算法描述简介：
DES是Data Encryption Standard（数据加密标准）的缩写。它是由IBM公司研制的一种加密算法，美国国家标准局于1977年公布把它作为非机要部门使用的数据加密标准；它是一个分组加密算法，他以64位为分组对数据加密。同时DES也是一个对称算法：加密和解密用的是同一个算法。它的密匙长度是56位（因为每个第8 位都用作奇偶校验），密匙可以是任意的56位的数，而且可以任意时候改变．
/// <summary>
/// DES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[] DESEncrypt(Byte[] Data, String Key, String Vector)
{
Byte[] bKey = new Byte[8];
Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);
Byte[] bVector = new Byte[8];
Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);
Byte[] Cryptograph = null; // 加密后的密文
DESCryptoServiceProvider EncryptProvider = new DESCryptoServiceProvider();
EncryptProvider.Mode = CipherMode.CBC;
EncryptProvider.Padding = PaddingMode.Zeros;
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,
EncryptProvider.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>
/// DES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[] DESDecrypt(Byte[] Data, String Key, String Vector)
{
Byte[] bKey = new Byte[8];
Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);
Byte[] bVector = new Byte[8];
Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);
Byte[] original = null;
DESCryptoServiceProvider CryptoProvider = new DESCryptoServiceProvider();
CryptoProvider.Mode = CipherMode.CBC;
CryptoProvider.Padding = PaddingMode.Zeros;
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,
CryptoProvider.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;
}
End of《C#实现DES加密解密》
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