/// <summary>
/// 根据加密类型加密
/// </summary>
/// <param name="inputBytes"> 需要加密的正文 </param>
/// <param name="randomBytes">随机填充</param>
/// <param name="aesKeyStatic">静态密钥</param>
/// <param name="aesKeyDynamic">动态密钥</param>
/// <param name="type">加密类型</param>
/// <param name="ms">内存流</param>
private static void InternalWriteEncryptDataByType(byte[] inputBytes, byte[] randomBytes, string aesKeyStatic, string aesKeyDynamic, EncryptType type, MemoryStream ms)
{
byte[] encBytes = inputBytes;
int intType = (int)type;
//客户端密钥更新强制优先检查
if ((intType & ((int)EncryptType.ResetKey)) != 0)
{
InternalWriteKeyUpdate(aesKeyStatic, randomBytes, ms);
}
int maxType = 16;
int child;
EncryptType childType;
int encryptCount = 0;
while (maxType > 0)
{
maxType = maxType >> 1;
child = maxType & intType;
if (child == 0)
{
continue;
}
encryptCount++;
childType = (EncryptType)child;
switch (childType)
{
case EncryptType.ResetKey:
break;
case EncryptType.AES:
encBytes = Cipher_Aes.EncryptToBytes(encBytes, aesKeyDynamic);
break;
case EncryptType.Gzip:
encBytes = Cipher_Gzip.Compress(encBytes);
break;
case EncryptType.PT:
break;
default:
throw new Exception("未受支持的加密类型");
}
}
if (encryptCount < 0)
{
throw new Exception("未识别的加密类型");
}
if (encBytes != null)
{
ms.Write(encBytes, 0, encBytes.Length);
}
}
/// <summary>
/// 解密正文并返回
/// </summary>
/// <param name="intType">int32的 加密类型</param>
/// <param name="aesKeyDynamic">动态加密</param>
/// <param name="ms">内存协议流</param>
/// <returns></returns>
private static byte[] InternalDecryptReturnContent(int intType, string aesKeyDynamic, MemoryStream ms)
{
//当前位置
int currPos = (int)ms.Position;
int encTextCount = (int)ms.Length - currPos;
byte[] retBytes = new byte[encTextCount];
ms.Read(retBytes, 0, retBytes.Length);
int currType = 1;
EncryptType state;
//这里的8是因为当前最大类别就是8
while (currType <= 8)
{
if ((currType & intType) != 0)
{
state = (EncryptType)currType;
switch (state)
{
case EncryptType.AES:
retBytes = Cipher_Aes.DecryptToBytes(retBytes, aesKeyDynamic);
break;
case EncryptType.Gzip:
retBytes = Cipher_Gzip.Decompress(retBytes);
break;
//纯文本，不需要解密
case EncryptType.PT:
break;
//最早判断，已经读取过了
case EncryptType.ResetKey:
break;
}
}
currType = currType << 1;
}
return(retBytes);
}
public static string DeGzip(this string input) => Encoding.UTF8.GetString(Cipher_Gzip.Decompress(Convert.FromBase64String(input)));
public static string ToGzip(this string input) => Convert.ToBase64String(Cipher_Gzip.Compress(Encoding.UTF8.GetBytes(input)));
