RustCrypto / RustCrypto/crypto-bigint
Expose bounded-stack schoolbook Montgomery operations
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- Dominant language
- Rust
- Stars
- 309
- Forks
- 95
- Avg merge
- 1d 14h
- Merged PRs (30d)
- 3
Description
mul::schoolbook, montgomery_multiply_inner, and friends exist but are pub(crate), so the only public 4096-bit multiply goes through karatsuba::wrapping_mul_fixed, whose fixed-size temporaries produce a ~25 KiB stack frame — unusable on 16 KiB-stack firmware (no_std, no-alloc env).
Request: public wrapping_mul_schoolbook-style entry points (or a precision-bounded vartime pow).
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading the existing mul::schoolbook, montgomery_multiply_inner, and karatsuba::wrapping_mul_fixed entry points. Compare their stack requirements for 4096-bit multiplication in the no_std context. Done when a public schoolbook-style operation or precision-bounded vartime pow path avoids the roughly 25 KiB stack frame.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- cryptography, embedded-iot
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 55/100