Winter utils

This crate contains utilities used by the Winterfell STARK prover and verifier. These utilities fall into the following broad categories:

• Traits used for serialization and deserialization.
• Functions for transmuting vectors and slices.
• Macros for easily switching between regular and parallel iterators.
• Feature-based re-exports of collections and strings.

Crate features

This crate can be compiled with the following features:

• std - enabled by default and relies on the Rust standard library.
• concurrent - implies std and also re-exports rayon crate and enables multi-threaded execution for some of the crate functions.
• no_std - does not rely on Rust's standard library and enables compilation to WebAssembly.

To compile with no_std, disable default features via --no-default-features flag.

Concurrent execution

When compiled with concurrent feature enabled, this crate re-exports rayon crate and executes the following functions using multiple threads:

• transpose_slice()

The number of threads can be configured via RAYON_NUM_THREADS environment variable, and usually defaults to the number of logical cores on the machine.

License

This project is MIT licensed.