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Add poly1305 stage

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Byron Lathi
2025-11-01 20:53:02 -07:00
parent 2102cb41f4
commit d5035c6c81
8 changed files with 356 additions and 5 deletions
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32
ChaCha20_Poly1305_64/doc/notes.md
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@@ -33,4 +33,34 @@ we need
r\*r = r^2
r\*r^2 = r^3 r^2\*r^2 = r^4
r^4\*r = r^5 r^2\*r^4 = r^6 r^3\*r^4 = r^7 r^4\*r^4 = r^8
r^4\*r = r^5 r^2\*r^4 = r^6 r^3\*r^4 = r^7 r^4\*r^4 = r^8
we can do all of these in parallel, so we 4 (n/2) multiply blocks that feed back
on themselves, with some kind of FSM to control it. This can be done while another
block is being hashed, but there will be a delay between when the key is ready from
the chacha block and when the powers are ready, so there needs to be a fifo in between.
Basically we have to wait until we see that the accumulator was written with our index.
At reset though, the acumulator is unwritten? So we need to pretend that it was written
Lets just write out what we want to happen:
1. The index starts at 0. We accept new data, and send it through the pipeline
2. We increment the index to 1.
3. We accept new data and send it through the pipeline
4. We increment the index to 2
5. We need to wait until the index 0 is written before we can say we are ready
6. If the index 1 is written then we still need to say we are ready though
7. We can just use the 1 to indicate that is a valid write then?
So in the shift register we just need to say whether it is a valid write or not,
so always 1?
But if we send in 0, then send in 1, then the current index will be 0
and eventually the final index will always be 0. We need to store what
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

59
ChaCha20_Poly1305_64/doc/poly1305_second_attempt.drawio Normal file
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@@ -0,0 +1,59 @@
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