private static GetMacSequenceNumber ( int epoch, long sequence_number ) : long | ||
epoch | int | |
sequence_number | long | |
return | long |
private void SendRecord(byte contentType, byte[] buf, int off, int len) { if (len > this.mPlaintextLimit) { throw new TlsFatalAlert(80); } if (len < 1 && contentType != 23) { throw new TlsFatalAlert(80); } int epoch = this.mWriteEpoch.Epoch; long num = this.mWriteEpoch.AllocateSequenceNumber(); byte[] array = this.mWriteEpoch.Cipher.EncodePlaintext(DtlsRecordLayer.GetMacSequenceNumber(epoch, num), contentType, buf, off, len); byte[] array2 = new byte[array.Length + 13]; TlsUtilities.WriteUint8(contentType, array2, 0); ProtocolVersion version = (this.mDiscoveredPeerVersion != null) ? this.mDiscoveredPeerVersion : this.mContext.ClientVersion; TlsUtilities.WriteVersion(version, array2, 1); TlsUtilities.WriteUint16(epoch, array2, 3); TlsUtilities.WriteUint48(num, array2, 5); TlsUtilities.WriteUint16(array.Length, array2, 11); Array.Copy(array, 0, array2, 13, array.Length); this.mTransport.Send(array2, 0, array2.Length); }
public virtual int Receive(byte[] buf, int off, int len, int waitMillis) { byte[] array = null; int result; while (true) { int num = Math.Min(len, this.GetReceiveLimit()) + 13; if (array == null || array.Length < num) { array = new byte[num]; } try { if (this.mRetransmit != null && DateTimeUtilities.CurrentUnixMs() > this.mRetransmitExpiry) { this.mRetransmit = null; this.mRetransmitEpoch = null; } int num2 = this.ReceiveRecord(array, 0, num, waitMillis); if (num2 < 0) { result = num2; } else { if (num2 < 13) { continue; } int num3 = TlsUtilities.ReadUint16(array, 11); if (num2 != num3 + 13) { continue; } byte b = TlsUtilities.ReadUint8(array, 0); switch (b) { case 20: case 21: case 22: case 23: case 24: { int num4 = TlsUtilities.ReadUint16(array, 3); DtlsEpoch dtlsEpoch = null; if (num4 == this.mReadEpoch.Epoch) { dtlsEpoch = this.mReadEpoch; } else if (b == 22 && this.mRetransmitEpoch != null && num4 == this.mRetransmitEpoch.Epoch) { dtlsEpoch = this.mRetransmitEpoch; } if (dtlsEpoch == null) { continue; } long num5 = TlsUtilities.ReadUint48(array, 5); if (dtlsEpoch.ReplayWindow.ShouldDiscard(num5)) { continue; } ProtocolVersion other = TlsUtilities.ReadVersion(array, 1); if (this.mDiscoveredPeerVersion != null && !this.mDiscoveredPeerVersion.Equals(other)) { continue; } byte[] array2 = dtlsEpoch.Cipher.DecodeCiphertext(DtlsRecordLayer.GetMacSequenceNumber(dtlsEpoch.Epoch, num5), b, array, 13, num2 - 13); dtlsEpoch.ReplayWindow.ReportAuthenticated(num5); if (array2.Length > this.mPlaintextLimit) { continue; } if (this.mDiscoveredPeerVersion == null) { this.mDiscoveredPeerVersion = other; } switch (b) { case 20: for (int i = 0; i < array2.Length; i++) { byte b2 = TlsUtilities.ReadUint8(array2, i); if (b2 == 1 && this.mPendingEpoch != null) { this.mReadEpoch = this.mPendingEpoch; } } continue; case 21: if (array2.Length == 2) { byte b3 = array2[0]; byte b4 = array2[1]; this.mPeer.NotifyAlertReceived(b3, b4); if (b3 == 2) { this.Fail(b4); throw new TlsFatalAlert(b4); } if (b4 == 0) { this.CloseTransport(); } } continue; case 22: if (!this.mInHandshake) { if (this.mRetransmit != null) { this.mRetransmit.ReceivedHandshakeRecord(num4, array2, 0, array2.Length); } continue; } break; case 23: if (this.mInHandshake) { continue; } break; case 24: continue; } if (!this.mInHandshake && this.mRetransmit != null) { this.mRetransmit = null; this.mRetransmitEpoch = null; } Array.Copy(array2, 0, buf, off, array2.Length); result = array2.Length; break; } default: continue; } } } catch (IOException ex) { throw ex; } break; } return(result); }