/// <summary>
/// 接收数据时，将字节数组解密
/// </summary>
/// <param name="_bytes">[in] 字节数组</param>
/// <param name="_key">[in] DES加密用的64位秘钥</param>
/// <returns>解密后的Byte数组</returns>
public static byte[] DecryptBytes(byte[] _bytes, string _key)
{
Debug.Assert(_key.Length == 8, "<DecryptBytes> key length must be 8.");
Debug.Assert(_bytes.Length % 8 == 0, "<DecryptBytes> input byte array length must mod 8 == 0.");
int batch_count = _bytes.Length / 8;
byte[] ret = new byte[_bytes.Length];
MemoryStream ms = new MemoryStream();
Des obj = new Des(_key);
for (int i = 0; i < batch_count; i++)
{
byte[] arr_encrypted_bytes = new byte[8];
byte[] arr_decrypted_bytes = new byte[8];
Array.Copy(_bytes, i * 8, arr_encrypted_bytes, 0, 8);
BitArray bit_arr_encrypted = new BitArray(arr_encrypted_bytes);
BitArray bit_arr_decrypted = obj.decrypt(bit_arr_encrypted);
bit_arr_decrypted.CopyTo(arr_decrypted_bytes, 0);
ms.Write(arr_decrypted_bytes, 0, 8);
}
ret = ms.ToArray();
ms.Close();
return(ret);
}
static void Main(string[] args)
{
BinaryWriter bw = new BinaryWriter(new FileStream(@"D:\as.txt", FileMode.OpenOrCreate));
Des obj = new Des("T&^9c=A`");
string s = "To be or";
BitArray cipher = obj.encrypt(s);
//PrintBitString(cipher);
byte[] arr = new byte[cipher.Length / 8];
cipher.CopyTo(arr, 0);
bw.Write(arr);
bw.Close();
BitArray plain = obj.decrypt(cipher);
//PrintBitString(plain);
}