Secure finishing for Hasher
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Description
With sufficiently expressive associated constants (including https://github.com/rust-lang/rust/issues/34344), it would be nice to provide scaffolding for secure hashing without allocation by extending Hasher like:
pub trait Hasher {
const DigestSize: usize = 8;
/// Completes a round of hashing, producing the untruncated output hash generated.
fn untruncated_finish(&self) -> [u8; Self::DigestSize] {
self.finish()
}
...
}
[I think specialization might also be required to write that default method; I forget what syntax is needed.]
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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
Begin by reviewing Rust's Hasher trait and the linked associated-constants issue. The issue proposes an allocation-free untruncated_finish API, but names no repository files or tests; done would require settling the trait design and syntax before implementation.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- backend-api-design
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 20/100