// Decryption Routine: Base64 -> AES -> Zlib
private static byte[] Decrypt(PackVersion version, uint size, uint sizeCompressed, Encryption flag, byte[] src)
{
if (flag.HasFlag(Encryption.Aes))
{
// Get the AES Key/IV for transformation
CipherKeys.GetKeyAndIV(version, sizeCompressed, out byte[] key, out byte[] iv);
// Decode the base64 encoded string
src = Convert.FromBase64String(Encoding.UTF8.GetString(src));
// Decrypt the AES encrypted block
AESCipher pCipher = new AESCipher(key, iv);
pCipher.TransformBlock(src, 0, size, src, 0);
}
else if (flag.HasFlag(Encryption.Xor))
{
// Decrypt the XOR encrypted block
src = EncryptXor(version, src, size, sizeCompressed);
}
return(flag.HasFlag(Encryption.Zlib) ? ZlibStream.UncompressBuffer(src) : src);
}
// Encryption Routine: Zlib -> AES -> Base64
public static byte[] Encrypt(PackVersion version, byte[] src, Encryption flag, out uint size,
out uint sizeCompressed, out uint sizeEncoded)
{
byte[] pEncrypted;
if (flag.HasFlag(Encryption.Zlib))
{
pEncrypted = ZlibStream.CompressBuffer(src);
}
else
{
pEncrypted = new byte[src.Length];
Buffer.BlockCopy(src, 0, pEncrypted, 0, src.Length);
}
size = (uint)src.Length;
sizeCompressed = (uint)pEncrypted.Length;
if (flag.HasFlag(Encryption.Aes))
{
// Get the AES Key/IV for transformation
CipherKeys.GetKeyAndIV(version, sizeCompressed, out byte[] key, out byte[] iv);
// Perform AES block encryption
var pCipher = new AESCipher(key, iv);
pCipher.TransformBlock(pEncrypted, 0, size, pEncrypted, 0);
// Encode the encrypted data into a base64 encoded string
pEncrypted = Encoding.UTF8.GetBytes(Convert.ToBase64String(pEncrypted));
}
else if (flag.HasFlag(Encryption.Xor))
{
// Perform XOR block encryption
pEncrypted = EncryptXor(version, pEncrypted, size, sizeCompressed);
}
sizeEncoded = (uint)pEncrypted.Length;
return(pEncrypted);
}
