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Ensure no IV collisions

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This commit is contained in:
Cameron Gutman 2024-01-14 13:18:22 -06:00
parent 3430ee2c3a
commit 6083a75d1b
1 changed files with 8 additions and 0 deletions
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8
src/ControlStream.c
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@ -510,6 +510,10 @@ static bool encryptControlMessage(PNVCTL_ENCRYPTED_PACKET_HEADER encPacket, PNVC
iv[2] = (unsigned char)(encPacket->seq >> 16);
iv[1] = (unsigned char)(encPacket->seq >> 8);
iv[0] = (unsigned char)(encPacket->seq >> 0);
// Set high bytes to something unique to ensure no IV collisions
iv[14] = (unsigned char)'C'; // Client originated
iv[15] = (unsigned char)'C'; // Control stream
}
else {
// This is a truncating cast, but it's what Nvidia does, so we have to mimic it.
@ -560,6 +564,10 @@ static bool decryptControlMessageToV1(PNVCTL_ENCRYPTED_PACKET_HEADER encPacket,
iv[2] = (unsigned char)(encPacket->seq >> 16);
iv[1] = (unsigned char)(encPacket->seq >> 8);
iv[0] = (unsigned char)(encPacket->seq >> 0);
// Set high bytes to something unique to ensure no IV collisions
iv[14] = (unsigned char)'H'; // Host originated
iv[15] = (unsigned char)'C'; // Control stream
}
else {
// This is a truncating cast, but it's what Nvidia does, so we have to mimic it.