num-bigint

Big integer types for Rust, BigInt and BigUint.

Usage

Add this to your Cargo.toml:

[dependencies]
num-bigint = "0.4"

Features

The std crate feature is enabled by default, and is mandatory before Rust 1.36 and the stabilized alloc crate. If you depend on num-bigint with default-features = false, you must manually enable the std feature yourself if your compiler is not new enough.

Random Generation

num-bigint supports the generation of random big integers when the rand feature is enabled. To enable it include rand as

rand = "0.8"
num-bigint = { version = "0.4", features = ["rand"] }

Note that you must use the version of rand that num-bigint is compatible with: 0.8.

Releases

Release notes are available in RELEASES.md.

Compatibility

The num-bigint crate is tested for rustc 1.31 and greater.

Alternatives

While num-bigint strives for good performance in pure Rust code, other crates may offer better performance with different trade-offs. The following table offers a brief comparison to a few alternatives.

Crate	License	Min rustc	Implementation	Features
num-bigint	MIT/Apache-2.0	1.31	pure rust	dynamic width, number theoretical functions
awint	MIT/Apache-2.0	1.66	pure rust	fixed width, heap or stack, concatenation macros
bnum	MIT/Apache-2.0	1.61	pure rust	fixed width, parity with Rust primitives including floats
crypto-bigint	MIT/Apache-2.0	1.57	pure rust	fixed width, stack only
ibig	MIT/Apache-2.0	1.49	pure rust	dynamic width, number theoretical functions
rug	LGPL-3.0+	1.65	bundles GMP via gmp-mpfr-sys	all the features of GMP, MPFR, and MPC

License

Licensed under either of

• Apache License, Version 2.0
• MIT license

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.