Ejemplo n.º 1
0
        // Decryption Routine: Base64 -> AES -> Zlib
        private static byte[] Decrypt(uint uVer, uint uLen, uint uLenCompressed, uint dwBufferFlag, byte[] pSrc)
        {
            byte[] bits = BitConverter.GetBytes(dwBufferFlag);

            if (!((bits[3] & 1) != 0))
            {
                byte[] aKey;
                byte[] aIV;
                // Get the AES Key/IV for transformation
                CipherKeys.GetKeyAndIV(uVer, uLenCompressed, out aKey, out aIV);

                // Decode the base64 encoded string
                pSrc = Convert.FromBase64String(Encoding.UTF8.GetString(pSrc));

                // Decrypt the AES encrypted block
                AESCipher pCipher = new AESCipher(aKey, aIV);
                pCipher.TransformBlock(pSrc, 0, uLen, pSrc, 0);
            }
            else
            {
                // Decrypt the XOR encrypted block
                pSrc = EncryptXOR(uVer, pSrc, uLen, uLenCompressed);
            }

            if (bits[0] != 0)
            {
                return(ZlibStream.UncompressBuffer(pSrc));
            }

            return(pSrc);
        }
Ejemplo n.º 2
0
        private static byte[] EncryptXOR(uint uVer, byte[] pSrc, uint uLen, uint uLenCompressed)
        {
            byte[] aKey;

            CipherKeys.GetXORKey(uVer, out aKey);

            uint uBlock       = uLen >> 2;
            uint uBlockOffset = 0;
            int  nKeyOffset   = 0;

            if (uBlock != 0)
            {
                while (uBlockOffset < uBlock)
                {
                    /*
                     *  _begin:
                     *      mov     eax, [ebp+pKey]
                     *      mov     eax, [eax+edx*4]
                     *      xor     [ebx+ecx*4], eax
                     *      inc     edx
                     *      inc     ecx
                     *      and     edx, 1FFh
                     *      cmp     ecx, esi
                     *      jb _begin
                     * _end:
                     *      mov     eax, [ebp+uLen]
                     */

                    uint pBlockData = BitConverter.ToUInt32(pSrc, (int)(4 * uBlockOffset)) ^ BitConverter.ToUInt32(aKey, 4 * nKeyOffset);
                    Buffer.BlockCopy(BitConverter.GetBytes(pBlockData), 0, pSrc, (int)(4 * uBlockOffset), sizeof(uint));

                    nKeyOffset = ((ushort)nKeyOffset + 1) & 0x1FF;
                    uBlockOffset++;
                }
            }

            uBlock = (uLen & 3);
            if (uBlock != 0)
            {
                int nStart = (int)(4 * uBlockOffset);

                uBlockOffset = 0;
                nKeyOffset   = 0;

                while (uBlockOffset < uBlock)
                {
                    pSrc[nStart + uBlockOffset++] ^= (byte)(aKey[nKeyOffset]);

                    nKeyOffset = ((ushort)nKeyOffset + 1) & 0x7FF;
                }
            }

            return(pSrc);
        }
Ejemplo n.º 3
0
        internal static string Hmac(string plainText, CipherKeys keys)
        {
            var base64String    = Convert.ToBase64String(Encoding.UTF8.GetBytes(plainText));
            var sessionKeyBytes = GetSessionKeyBytes(keys);

            using (var hmacsha256 = new HMACSHA256(sessionKeyBytes))
            {
                byte[] data        = Encoding.UTF8.GetBytes(base64String);
                byte[] hashmessage = hmacsha256.ComputeHash(data);
                return(Convert.ToBase64String(hashmessage));
            }
        }
Ejemplo n.º 4
0
        internal static byte[] GetRekBytes(string rek, CipherKeys keys)
        {
            byte[]     dataToDecrypt = Convert.FromBase64String(rek);
            AesManaged tdes          = new AesManaged
            {
                KeySize   = 256,
                BlockSize = 128,
                Key       = GetSessionKeyBytes(keys),
                Mode      = CipherMode.ECB,
                Padding   = PaddingMode.PKCS7
            };

            ICryptoTransform decrypt = tdes.CreateDecryptor();

            byte[] deCipher = decrypt.TransformFinalBlock(dataToDecrypt, 0, dataToDecrypt.Length);
            tdes.Clear();

            return(deCipher);
        }
Ejemplo n.º 5
0
        //track return status api
        public static Response TrackReturnStatus(string username, string authToken, CipherKeys keys, string gstin, string returnPeriod, string returnType)
        {
            var queryString = new NameValueCollection
            {
                { "action", "RETTRACK" },
                { "gstin", gstin },
                { "fy", returnPeriod },
                { "type", returnType }
            };

            var handler = new RequestHandler();

            handler.UserRequest.Keys             = keys;
            handler.UserRequest.Header.Username  = username;
            handler.UserRequest.Header.AuthToken = authToken;
            var url = UrlHandler.Route(accessGroup.commonapi, version.v1_0, modName.returns);

            return(handler.DecryptGetResponse(url, queryString));
        }
Ejemplo n.º 6
0
        // Encryption Routine: Zlib -> AES -> Base64
        public static byte[] Encrypt(uint uVer, byte[] pSrc, uint dwBufferFlag, out uint uLen, out uint uLenCompressed, out uint uLenEncoded)
        {
            byte[] bits = BitConverter.GetBytes(dwBufferFlag);

            byte[] pEncrypted;
            if (bits[0] != 0)
            {
                pEncrypted = ZlibStream.CompressBuffer(pSrc);
            }
            else
            {
                pEncrypted = new byte[pSrc.Length];
                Buffer.BlockCopy(pSrc, 0, pEncrypted, 0, pSrc.Length);
            }

            uLen           = (uint)pSrc.Length;
            uLenCompressed = (uint)pEncrypted.Length;

            if (!((bits[3] & 1) != 0))
            {
                byte[] aKey;
                byte[] aIV;
                // Get the AES Key/IV for transformation
                CipherKeys.GetKeyAndIV(uVer, uLenCompressed, out aKey, out aIV);

                // Perform AES block encryption
                AESCipher pCipher = new AESCipher(aKey, aIV);
                pCipher.TransformBlock(pEncrypted, 0, uLen, pEncrypted, 0);

                // Encode the encrypted data into a base64 encoded string
                pEncrypted = Encoding.UTF8.GetBytes(Convert.ToBase64String(pEncrypted));
            }
            else
            {
                // Perform XOR block encryption
                pEncrypted = EncryptXOR(uVer, pEncrypted, uLen, uLenCompressed);
            }

            uLenEncoded = (uint)pEncrypted.Length;

            return(pEncrypted);
        }
Ejemplo n.º 7
0
        private static byte[] EncryptXor(PackVersion version, byte[] src, uint size, uint sizeCompressed)
        {
            CipherKeys.GetXorKey(version, out byte[] key);

            uint uBlock       = size >> 2;
            uint uBlockOffset = 0;
            int  nKeyOffset   = 0;

            if (uBlock != 0)
            {
                while (uBlockOffset < uBlock)
                {
                    uint pBlockData = BitConverter.ToUInt32(src, (int)(4 * uBlockOffset)) ^
                                      BitConverter.ToUInt32(key, 4 * nKeyOffset);
                    Buffer.BlockCopy(BitConverter.GetBytes(pBlockData), 0, src, (int)(4 * uBlockOffset),
                                     sizeof(uint));

                    nKeyOffset = ((ushort)nKeyOffset + 1) & 0x1FF;
                    uBlockOffset++;
                }
            }

            uBlock = (size & 3);
            if (uBlock != 0)
            {
                int nStart = (int)(4 * uBlockOffset);

                uBlockOffset = 0;
                nKeyOffset   = 0;

                while (uBlockOffset < uBlock)
                {
                    src[nStart + uBlockOffset++] ^= (byte)(key[nKeyOffset]);

                    nKeyOffset = ((ushort)nKeyOffset + 1) & 0x7FF;
                }
            }

            return(src);
        }
Ejemplo n.º 8
0
        // 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);
        }
Ejemplo n.º 9
0
        // 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);
        }
Ejemplo n.º 10
0
        internal static string EncryptTextWithSessionKey(string plainText, CipherKeys keys)
        {
            var base64String = Convert.ToBase64String(Encoding.UTF8.GetBytes(plainText));

            byte[] dataToEncrypt = Encoding.UTF8.GetBytes(base64String);

            AesManaged tdes = new AesManaged
            {
                KeySize   = 256,
                BlockSize = 128,
                Key       = GetSessionKeyBytes(keys),
                Mode      = CipherMode.ECB,
                Padding   = PaddingMode.PKCS7
            };


            ICryptoTransform crypt = tdes.CreateEncryptor();

            byte[] cipher = crypt.TransformFinalBlock(dataToEncrypt, 0, dataToEncrypt.Length);
            tdes.Clear();
            return(Convert.ToBase64String(cipher, 0, cipher.Length));
        }
Ejemplo n.º 11
0
        internal static string DecryptResponseData(string dataToDecrypt, string rek, CipherKeys keys)
        {
            byte[]     dataToDecryptBytes = Convert.FromBase64String(dataToDecrypt);
            AesManaged tdes = new AesManaged
            {
                KeySize   = 256,
                BlockSize = 128,
                Key       = GetRekBytes(rek, keys),
                Mode      = CipherMode.ECB,
                Padding   = PaddingMode.PKCS7
            };

            ICryptoTransform decrypt = tdes.CreateDecryptor();

            byte[] deCipher = decrypt.TransformFinalBlock(dataToDecryptBytes, 0, dataToDecryptBytes.Length);
            tdes.Clear();

            var deCipherData = Encoding.UTF8.GetString(deCipher);
            var json         = Encoding.UTF8.GetString(Convert.FromBase64String(deCipherData));

            return(json);
        }