BigUnsignedInts

Description

BigUnsignedInts is a crate for Rust that allows you to use large unsigned integers ranging from U256 through U2048. These are implemented using fixed-sized arrays and converts from u8 to u64 types. It also allows you to convert back from u64 to an array of u8s without using unsafe code.

The u8 -> u64 conversion uses mem::transmute with unsafe code to perform the process.

No functions should be used aside from the standard traits From and Into to convert between u8 and u64.

How To Use

Write the following inside your cargo.toml file under dependencies:

big_unsigned_ints = "0.1.2"

Then, you can import it like so:

rust extern crate big_unsigned_ints;

Please view the tests folder for integration testing and how you can use the library itself.

Standard Documentation On Usage

Converting Array of Bytes To U256 Type (Quick Version)

rust fn bytes_to_u256 (){ let x = [243u8;32]; // Conversion Occurs From Bytes of Array To The Type let y = big_unsigned_ints::U256::from(x); }

Converting Array of Bytes To U256 Type Back To An Array Of Bytes

rust fn bytes_to_big (){ // Create an array of 32x 243u8, or 256bits let x = [243u8;32]; // Convert From the Array of Bytes Into a U256 Type ([u64;4]) let y = big_unsigned_ints::U256::from(x); // Convert Back Into An Array of Bytes let b: [u8;32] = y.into(); // Prints Out The Statements println!("{:?}",b) }

Available Types

License