public void DeserializatinTest()
{
var pq = new BigInteger("2821213750622862821", 10);
var resPq = new TResPQ
{
Nonce = new byte[16],
ServerNonce = new byte[16],
PqAsBinary = pq.ToByteArrayUnsigned(),
ServerPublicKeyFingerprints = new TVector <long>(5611009732197236050)
};
_random.NextBytes(resPq.Nonce);
_random.NextBytes(resPq.ServerNonce);
var response = Step2ClientHelper.GetRequest(resPq, PublicKey, out var newNonce);
var buffer = Serializer.Serialize(response);
var dataNew = new byte[buffer.ReadableBytes];
buffer.ReadBytes(dataNew);
var a = new Step2DhExchange();
var dataOld = a.ToBytes(resPq.Nonce, resPq.ServerNonce, newNonce, new List <byte[]>()
{
BitConverter.GetBytes(5611009732197236050)
},
new Old.MTProto.Crypto.BigInteger("2821213750622862821", 10));
Assert.Equal(dataNew, dataOld);
}
public void ValidationTest()
{
var pqData = new byte[] { 35, 85, 96, 197, 87, 11, 113, 253 };
var resPq = new TResPQ
{
Nonce = new byte[16],
ServerNonce = new byte[16],
PqAsBinary = pqData,
ServerPublicKeyFingerprints = new TVector <long>(5611009732197236050)
};
_random.NextBytes(resPq.Nonce);
_random.NextBytes(resPq.ServerNonce);
var response = Step2ClientHelper.GetRequest(resPq, PublicKey, out var newNonce);
var a = new Step2DhExchange();
var bytes = a.ToBytes(resPq.Nonce, resPq.ServerNonce, newNonce, new List <byte[]>()
{
BitConverter.GetBytes(5611009732197236050)
},
new Old.MTProto.Crypto.BigInteger(1, pqData));
var buffer = PooledByteBufferAllocator.Default.Buffer();
buffer.WriteBytes(bytes);
var responseOld = (RequestReqDHParams)Serializer.Deserialize(buffer);
Assert.Equal(response.PAsBinary, responseOld.PAsBinary);
Assert.Equal(response.QAsBinary, responseOld.QAsBinary);
Assert.Equal(response.Nonce, responseOld.Nonce);
Assert.Equal(response.ServerNonce, responseOld.ServerNonce);
Assert.Equal(response.PublicKeyFingerprint, responseOld.PublicKeyFingerprint);
var responseInnerData = Decrypt(response, out var responseInnerDataChecksum);
var responseOldInnerData = Decrypt(responseOld, out var responseOldInnerDataChecksum);
Assert.Equal(responseInnerDataChecksum, responseOldInnerDataChecksum);
Assert.Equal(responseInnerData.PqAsBinary, responseOldInnerData.PqAsBinary);
Assert.Equal(responseInnerData.PAsBinary, responseOldInnerData.PAsBinary);
Assert.Equal(responseInnerData.QAsBinary, responseOldInnerData.QAsBinary);
Assert.Equal(responseInnerData.Nonce, responseOldInnerData.Nonce);
Assert.Equal(responseInnerData.ServerNonce, responseOldInnerData.ServerNonce);
Assert.Equal(responseInnerData.NewNonce, responseOldInnerData.NewNonce);
}
public static RequestReqDHParams GetRequest(TResPQ resPq, string publicKey, out byte[] newNonce)
{
var pq = new BigInteger(resPq.PqAsBinary);
var f1 = PollardRho.Factor(pq);
var f2 = pq.Divide(f1);
var p = f1.Min(f2);
var q = f1.Max(f2);
newNonce = new byte[32];
Random.NextBytes(newNonce);
var pqInnerData = new TPQInnerData
{
PqAsBinary = pq.ToByteArrayUnsigned(),
PAsBinary = p.ToByteArrayUnsigned(),
QAsBinary = q.ToByteArrayUnsigned(),
ServerNonce = resPq.ServerNonce,
Nonce = resPq.Nonce,
NewNonce = newNonce
};
var serializedData = Serializer.Serialize(pqInnerData);
byte[] innerData;
try
{
innerData = serializedData.ToArray();
}
finally
{
serializedData.SafeRelease();
}
var fingerprint = RSAHelper.GetFingerprint(publicKey);
if (!resPq.ServerPublicKeyFingerprints.Contains(fingerprint))
{
throw new InvalidOperationException("The fingerprint is not found");
}
var hashsum = Sha1Helper.ComputeHashsum(innerData);
var dataWithHash = PooledByteBufferAllocator.Default.Buffer();
byte[] innerDataWithHash;
try
{
dataWithHash.WriteBytes(hashsum);
dataWithHash.WriteBytes(innerData);
var paddingBytes = new byte[255 - dataWithHash.ReadableBytes];
Random.NextBytes(paddingBytes);
dataWithHash.WriteBytes(paddingBytes);
innerDataWithHash = dataWithHash.ToArray();
}
finally
{
dataWithHash.SafeRelease();
}
var ciphertext = RSAHelper.RsaEncryptWithPublic(innerDataWithHash, publicKey);
return(new RequestReqDHParams
{
Nonce = resPq.Nonce,
PAsBinary = p.ToByteArrayUnsigned(),
QAsBinary = q.ToByteArrayUnsigned(),
ServerNonce = resPq.ServerNonce,
PublicKeyFingerprint = fingerprint,
EncryptedDataAsBinary = ciphertext
});
}
