# Big_Unsigned_Ints
 [](https://travis-ci.org/0xAtropine/big_unsigned_ints)
## Description
**Big_Unsigned_Ints** 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 = "0.1.6"`
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
```rust
fn example_bytes (){
// 32-fixed sized array of bytes
let x = [243u8;32];
// Conversion Occurs From Bytes of Array To The Type
let y = big_unsigned_ints::U256::from(x);
// Prints as Hexadecimal
println!("{}",y)
}
```
### Converting Array of Bytes To U256 Type Back To An Array Of Bytes
```rust
fn bytes_to_big_int (){
// 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 Specifying the Type For Bytes
let b: [u8;32] = y.into();
}
```
## Available Types
* U256 `[u64;4]` | `[u8;32]`
* U384 `[u64;6]` | `[u8;48]`
* U512 `[u64;8]` | `[u8;64]`
* U1024 `[u64;16]` | `[u8;128]`
* U2048 `[u64;32]` | `[u8;256]`
## License
* MIT License
* Apache 2.0