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Partially-Reduced Montgomery Multiplication/Squaring #133

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mratsim opened this issue Jan 23, 2021 · 0 comments · Fixed by #176
Closed

Partially-Reduced Montgomery Multiplication/Squaring #133

mratsim opened this issue Jan 23, 2021 · 0 comments · Fixed by #176
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constant time ⏳ Enhancement is suitable for secret data performance 🏁

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@mratsim
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mratsim commented Jan 23, 2021

We can accelerate exponentiations and addition chains in finite fields by skipping the final substraction.
The constant-time final substraction involves 3 passes over the data:

  • testing if result < modulus
  • substraction
  • conditional mov

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@mratsim mratsim added constant time ⏳ Enhancement is suitable for secret data performance 🏁 labels Jan 23, 2021
@mratsim mratsim mentioned this issue Feb 14, 2022
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Low-level refactor part 2 mratsim/constantine
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