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Fix incorrect IV for encrypted control stream packets on big-endian machines

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This commit is contained in:
Cameron Gutman 2021-07-17 22:29:30 -05:00
commit b2c39883bf
1 changed files with 4 additions and 3 deletions
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7
src/ControlStream.c
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@ -410,6 +410,10 @@ static bool encryptControlMessage(PNVCTL_ENCRYPTED_PACKET_HEADER encPacket, PNVC
unsigned char iv[16] = { 0 };
int encryptedSize = sizeof(*packet) + packet->payloadLength;
// This is a truncating cast, but it's what Nvidia does, so we have to mimic it.
// NB: Setting the IV must happen while encPacket->seq is still in native byte-order!
iv[0] = (unsigned char)encPacket->seq;
encPacket->encryptedHeaderType = LE16(encPacket->encryptedHeaderType);
encPacket->length = LE16(encPacket->length);
encPacket->seq = LE32(encPacket->seq);
@ -417,9 +421,6 @@ static bool encryptControlMessage(PNVCTL_ENCRYPTED_PACKET_HEADER encPacket, PNVC
packet->type = LE16(packet->type);
packet->payloadLength = LE16(packet->payloadLength);
// This is a truncating cast, but it's what Nvidia does, so we have to mimic it.
iv[0] = (unsigned char)encPacket->seq;
return PltEncryptMessage(encryptionCtx, ALGORITHM_AES_GCM, 0,
(unsigned char*)StreamConfig.remoteInputAesKey, sizeof(StreamConfig.remoteInputAesKey),
iv, sizeof(iv),