#hash #no-std #deterministic

no-std deterministic-hash

Create deterministic hashes regardless of architecture

2 stable releases

1.0.1 Jul 12, 2021

#731 in Cryptography

Download history 67/week @ 2022-05-31 90/week @ 2022-06-07 60/week @ 2022-06-14 51/week @ 2022-06-21 28/week @ 2022-06-28 95/week @ 2022-07-05 141/week @ 2022-07-12 167/week @ 2022-07-19 195/week @ 2022-07-26 111/week @ 2022-08-02 50/week @ 2022-08-09 22/week @ 2022-08-16 89/week @ 2022-08-23 28/week @ 2022-08-30 11/week @ 2022-09-06 64/week @ 2022-09-13

195 downloads per month
Used in froggy-rand

MIT license

6KB
65 lines

deterministic-hash

Tiny Rust library to create deterministic hashes regardless of architecture. This library is no-std compatible and uses no allocations or dependencies.

The default core::hash::Hasher implementation ensures a platform dependant hashing of datastructures that use #[derive(Hash)]. Most notably by:

  • using to_ne_bytes for u{8,16,32,64,128}.
  • using the native bytelength of usize.

The DeterministicHasher of this library forces the use of to_le_bytes and casts usize to u64 regardless of your platform. Hence the hasher will be less efficient, but will be deterministic when using the same library in different architecture contexts. I use a common dataprotocol library both on ARM embedded systems, wasm and x64.

You can validate the operation of this library with cross by running:

cargo install cross
cross test --target=x86_64-unknown-linux-gnu
cross test --target=aarch64-unknown-linux-gnu
cross test --target=arm-unknown-linux-gnueabihf

lib.rs:

Tiny Rust library to create deterministic hashes regardless of architecture. This library is no-std compatible and uses no allocations or dependencies.

The default core::hash::Hasher implementation ensures a platform dependant hashing of datastructures that use #[derive(Hash)]. Most notably by:

  • using to_ne_bytes for u{8,16,32,64,128}.
  • using the native bytelength of usize.

The DeterministicHasher of this library forces the use of to_le_bytes and casts usize to u64 regardless of your platform. Hence the hasher will be less efficient, but will be deterministic when using the same library in different architecture contexts. I use a common dataprotocol library both on ARM embedded systems, wasm and x64.

From any hasher make it deterministic by inserting DeterministicHasher in between:

let hasher = crc::crc32::Digest::new(crc::crc32::KOOPMAN);
let hasher = deterministic_hash::DeterministicHasher::new(hasher);

No runtime deps