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Author SHA1 Message Date
Byron Lathi
9b40c88673 Whatever I was working on 2026-01-18 21:58:56 -08:00
3 changed files with 146 additions and 109 deletions
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54
ChaCha20_Poly1305_64/doc/notes.md
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@@ -63,4 +63,56 @@ the last written one is.
We can just say the last written one was 2 I guess
We also need an input that tells it to reset the accumulator
We also need an input that tells it to reset the accumulator
What if instead of calculating all the way up to R^16 I just calculated up to r^8
and then just had 2 parallel blocks?
Lets think about the worst case throughput. The theoretical layout would have
8 of these in parallel. A minimum size packet of 64 bytes for example, is 512
bits. This is less than 128*8, so it would only take one round. Therefore, we
take 16 cycles to do 64 bytes, or 32 bits per cycle. This is only 1/4 of our
target throughput. In order to reach our target throughput of 128 bits per cycle,
If the packet is enough to fit into the second phase of the multiplier, then it
can run in parallel and give up to 256 bits per 16 cycles. In order for this to
happen, the packet size must be greater than 128*16, or 256 bytes. I would really
like to be able to reach our target throughput with 64 byte packets, so we may
need to have more smaller multipliers that can run in parallle, at the cost of
latency for larger packets.
a 64 byte packet is 512 bytes, which takes up 4 128 bit lanes. If we have a group
of 2 multipliers, they can do 128\*2\*2 bits per 16 cycles, or 512 bits per 16
cycles, which is 32 bits per cycle as we said earlier. To hit our target of 128
bits per cycle we just instantiate 4 of them. This results in the same number of
multipliers (8), but configured differently to prioritize throughput over latency.
We need to have a demux or whatever go between the groups.
If we only do 4 effective lanes in parallel, then we only need to do the multiply
loop twice
r->r^2
This will take 26 cycles, which is not ideal. Could we figure out a way to do all
of these powers in one step, taking only 13 cycles?
Alternatively, we could only do a single parallel step and just calculate R^2. This
would mean we have 8 different hashes going on at the same time, and would drastically
increase latency, but I think that is a fair tradeoff
So basically we need to store incoming data as 128 bit words. We will first get
r and s as 128 bit words. We store both and start work on squaring r. We will
also be recieving data this whole time at 128 bits per cycle which we store in
a FIFO. Once R^2 is calculated, we start running it through the multiplier, with
a counter that tells us when we should be using R and when we should be using
r^2. We only have 1 value to worry about, when we get the last value we only
use R instead of R^2. we also need to remember to store the outputs on both
last cycles. Since we are storing the data in a FIFO, we will know which is the
last. There is also a possibility that the data will not be a full 128 bits, so
we need to handle adding the leading 1 as well.
We can use 1 multiplier, 2 data fifos, 2 constant buffers.
The utilization of the multiplier is kinda low though since its only used
once per packet instaead of every 16 bytes

194
ChaCha20_Poly1305_64/doc/poly1305.drawio
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@@ -1,144 +1,128 @@
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7
ChaCha20_Poly1305_64/sim/poly1305_stage.py
View File

@@ -5,6 +5,7 @@ import cocotb
from cocotb.clock import Clock
from cocotb.triggers import Timer, RisingEdge, FallingEdge
from cocotb.queue import Queue
from cocotb.handle import Immediate
from cocotbext.axi import AxiStreamBus, AxiStreamSource
@@ -29,7 +30,7 @@ class TB:
self.expected_queue = Queue()
self.output_queue = Queue()
cocotb.start_soon(Clock(self.dut.i_clk, CLK_PERIOD, units="ns").start())
cocotb.start_soon(Clock(self.dut.i_clk, CLK_PERIOD, unit="ns").start())
cocotb.start_soon(self.run_input())
cocotb.start_soon(self.run_output())
@@ -41,7 +42,7 @@ class TB:
await self._cycle_reset(self.dut.i_rst, self.dut.i_clk)
async def _cycle_reset(self, rst, clk):
rst.setimmediatevalue(0)
rst.value = Immediate(0)
await RisingEdge(clk)
await RisingEdge(clk)
rst.value = 1
@@ -82,7 +83,7 @@ class TB:
while True:
await RisingEdge(self.dut.i_clk)
if self.dut.o_valid.value:
await self.output_queue.put(self.dut.o_result.value.integer)
await self.output_queue.put(self.dut.o_result.value.to_unsigned())
@cocotb.test
async def test_sanity(dut):