Add basic repo
This commit is contained in:
Byron Lathi
388
ChaCha20_Poly1305_64/doc/chacha20.drawio
Normal file
388
ChaCha20_Poly1305_64/doc/chacha20.drawio
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BIN
ChaCha20_Poly1305_64/doc/chacha20.drawio.png
Normal file
BIN
ChaCha20_Poly1305_64/doc/chacha20.drawio.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 38 KiB |
@@ -31,3 +31,71 @@ To support AEAD, The first round becomes the key for the Poly1305 block. This
|
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can be done in parallel with the second round, which becomes the cipher, at the
|
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expense of double the gates. Otherwise, there would be a delay in between
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packets as this is generated.
|
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|
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Okay so we did some timing tests and we can easily do 1 round of ChaCha20 in a
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single cycle on a Titanium FPGA at 250MHz (~350-400 MHz)
|
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|
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So then it will take 20 cycles to calculate 512 bits, or 25.6 bits/cycle, or
|
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6.4Gbps. So then we will need 2 of these for 10Gbps.
|
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|
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So in order to use multiple cores, we would calculate 1024 bits in 20 cycles.
|
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Then we would put those bits into a memory or something and start calculating
|
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the next 1024 bits. Those bits would all be used up in 16 cycles, (but the
|
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throughput still checks out). Once they are used, we load the memory with the
|
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new output.
|
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|
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This puts a 20 cycle minimum on small packets since the core is not completely
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pipelined. This puts a hard cap at 12.5Mpps. At 42 byte packets, this is
|
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4.2Gbps, and for 64 byte packets is 6.4Gbps. In order to saturate the link, you
|
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would need packets of at least 100 bytes.
|
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|
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This is with the 20 cycle minimum, though in reality it would be more like 25
|
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or 30 with the final addition, scheduling, pipelining etc. Adding more cores
|
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increases the throughput for larger packets, but does nothing for small packets
|
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since the latency is the same. To solve this, we could instantiate the entire
|
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core twice, such that we could handle 2 minimum size packets at the same time.
|
||||
|
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If we say there is a 30 cycle latency, the worst case is 2.8Gbps. Doubling the
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number of cores gives 5.6, quadrupling the number of cores gives 11.2Gbps. This
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would of course more than quadrouple the area since we need 4x the cores as
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well as the mux and demux between them.
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This could be configurable at compile time though. The number of ChaChas per
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core would also be configurable, but at the moment I choose 2.
|
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Just counting the quarter rounds, there are 4\*2\*4 = 32 QR modules, or 64 if
|
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we want to 8 QRs per core instead of 4 for timing reasons.
|
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|
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Each QR is 322 XLR, so just the QR would be either 10k or 20k XLR.. That's kind
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of a lot. A fully pipelined design would use 322\*20\*4 or 25k XLR. If we can
|
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pass timing using 10k luts than that would be nice. We get a peak throughput
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of 50Gbps, its just that the latency kills our packet rate. If we reduce the
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latency to 25 cycles and have 2 alternating cores, our packet rate would be
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20Mpps, increasing with every cycle we take off. I think that is good. This
|
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would result in 5k XLR which is not so bad.
|
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|
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Okay so starting over now, our clock speed cannot be 250MHz, the best we can do
|
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is 200MHz. If we assume this same 25 cycle latency, thats 4Gbps per block, so
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we would need 3 of them to surpass 10Gbps (each is 4096) so now we need 3 blocks
|
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instead of 2.
|
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|
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We are barely going to be able to pass at 180MHz. maybe the fully pipelined
|
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core is a better idea, but we can just fully pipeline a quarter stage, and
|
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generate 512 bits every 4 clock cycles. This would give us a theoretical
|
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throughput of 32Gbps, and we would not have to worry about latency and small
|
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packets slowing us down. Lets experiment with what that would look like.
|
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|
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For our single round its using 1024 adders, which almost sounds like it is
|
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instantiating 8 quarter rounds instead of just 4. Either way, we can say that
|
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a quarter round is 128ff + 128add + 250lut.
|
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|
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So pipelining 20 of these gives 10k luts. Not so bad.
|
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|
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Actualyl its 88k luts... its 512ff * 4 * 20 = 40k ff
|
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|
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Lets just leave it for now even if its overkill. The hardware would support up to
|
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40Gbps, and technically the FPGA has 16 lanes so could do 160Gbps in total, if
|
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we designed a custom board for it (or 120 if we used FMC connectors).
|
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Reference in New Issue
Block a user