commit	407b6668f3fa111df8221fcc21e49b2152fddfdf	[log] [tgz]
author	Android Build Coastguard Worker <[email protected]>	Tue Oct 01 23:13:40 2024 +0000
committer	Android Build Coastguard Worker <[email protected]>	Tue Oct 01 23:13:40 2024 +0000
tree	e8d30dd917db009bfead9f9df486a9827c1c7930
parent	4ad92217ec22642e97998cc5dce3f98c6147a18a [diff]
parent	d3397fd7f7681a4644db975d0925f71a56b0685d [diff]

tree: e8d30dd917db009bfead9f9df486a9827c1c7930

README.md

SipHash implementation for Rust

This crates implements SipHash-2-4 and SipHash-1-3 in Rust.

It is based on the original implementation from rust-core and exposes the same API.

It also implements SipHash variants returning 128-bit tags.

The sip module implements the standard 64-bit mode, whereas the sip128 module implements the 128-bit mode.

Usage

In Cargo.toml:

[dependencies]
siphasher = "1"

If you want serde support, include the feature like this:

[dependencies]
siphasher = { version = "1", features = ["serde"] }

64-bit mode:

use siphasher::sip::{SipHasher, SipHasher13, SipHasher24};

// one-shot:

let array: &[u8] = &[1, 2, 3];
let key: &[u8; 16] = &[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16];
let hasher = SipHasher13::new_with_key(key);
let h = hasher.hash(array);

// incremental:

use core::hash::Hasher;

let array1: &[u8] = &[1, 2, 3];
let array2: &[u8] = &[4, 5, 6];
let key: &[u8; 16] = &[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16];
let mut hasher = SipHasher13::new_with_key(key);
hasher.write(array1);
hasher.write(array2);
let h = hasher.finish();

128-bit mode:

use siphasher::sip128::{Hasher128, SipHasher, SipHasher13, SipHasher24};

// one-shot:

let array: &[u8] = &[1, 2, 3];
let key: &[u8; 16] = &[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16];
let hasher = SipHasher13::new_with_key(key);
let h = hasher.hash(array).as_bytes();

// incremental:

use core::hash::Hasher;

let array1: &[u8] = &[1, 2, 3];
let array2: &[u8] = &[4, 5, 6];
let key: &[u8; 16] = &[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16];
let mut hasher = SipHasher13::new_with_key(key);
hasher.write(array1);
hasher.write(array2);
let h = hasher.finish128().as_bytes();

API documentation

Note

Due to a confusing and not well documented API, methods from the Hasher trait of the standard library (std::hash::Hasher, core::hash::Hasher) produce non-portable results.

This is not specific to SipHash, and affects all hash functions.

The only safe methods in that trait are write() and finish().

It is thus recommended to use SipHash (and all other hash functions, actually) as documented above.