public byte[] ToBytes(byte[] nonce, byte[] serverNonce, List<byte[]> fingerprints, BigInteger pq)
{
new Random().NextBytes(newNonce);
var pqPair = Factorizator.Factorize(pq);
byte[] reqDhParamsBytes;
using (MemoryStream pqInnerData = new MemoryStream(255))
{
using (BinaryWriter pqInnerDataWriter = new BinaryWriter(pqInnerData))
{
pqInnerDataWriter.Write(0x83c95aec); // pq_inner_data
Serializers.Bytes.write(pqInnerDataWriter, pq.ToByteArrayUnsigned());
Serializers.Bytes.write(pqInnerDataWriter, pqPair.Min.ToByteArrayUnsigned());
Serializers.Bytes.write(pqInnerDataWriter, pqPair.Max.ToByteArrayUnsigned());
pqInnerDataWriter.Write(nonce);
pqInnerDataWriter.Write(serverNonce);
pqInnerDataWriter.Write(newNonce);
byte[] ciphertext = null;
byte[] targetFingerprint = null;
foreach (byte[] fingerprint in fingerprints)
{
ciphertext = RSA.Encrypt(BitConverter.ToString(fingerprint).Replace("-", string.Empty),
pqInnerData.GetBuffer(), 0, (int)pqInnerData.Position);
if (ciphertext != null)
{
targetFingerprint = fingerprint;
break;
}
}
if (ciphertext == null)
{
throw new InvalidOperationException(
String.Format("not found valid key for fingerprints: {0}", String.Join(", ", fingerprints)));
}
using (MemoryStream reqDHParams = new MemoryStream(1024))
{
using (BinaryWriter reqDHParamsWriter = new BinaryWriter(reqDHParams))
{
reqDHParamsWriter.Write(0xd712e4be); // req_dh_params
reqDHParamsWriter.Write(nonce);
reqDHParamsWriter.Write(serverNonce);
Serializers.Bytes.write(reqDHParamsWriter, pqPair.Min.ToByteArrayUnsigned());
Serializers.Bytes.write(reqDHParamsWriter, pqPair.Max.ToByteArrayUnsigned());
reqDHParamsWriter.Write(targetFingerprint);
Serializers.Bytes.write(reqDHParamsWriter, ciphertext);
reqDhParamsBytes = reqDHParams.ToArray();
}
}
}
return reqDhParamsBytes;
}
}
public AuthKey(BigInteger gab) {
key = gab.ToByteArrayUnsigned();
using(SHA1 hash = new SHA1Managed()) {
using(MemoryStream hashStream = new MemoryStream(hash.ComputeHash(key), false)) {
using(BinaryReader hashReader = new BinaryReader(hashStream)) {
auxHash = hashReader.ReadUInt64();
hashReader.ReadBytes(4);
keyId = hashReader.ReadUInt64();
}
}
}
}
