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Xoodyak, a lightweight and versatile cryptographic scheme implemented in Rust.

License: MIT License

Rust 100.00%

xoodoo xoodyak cyclist nist lightweight crypto cryptography

rust-xoodyak's Introduction

Xoodyak for Rust

This is a Rust implementation of Xoodyak, a cryptographic primitive that can be used for hashing, encryption, MAC computation and authenticated encryption.

no_std-friendly
Lightweight
Can be compiled to WebAssembly/WASI
Session support
Safe Rust interface
AEAD with attached and detached tags
In-place encryption
Ratcheting
Variable-length output hashing, authentication
squeeze_more(), absorb_more() for streaming.

API documentation

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rust-xoodyak's Issues

Wrong test vector?

rust-xoodyak/src/test.rs

Lines 18 to 29 in 449e8e2

    
           fn test_unkeyed_empty() { 
        
               let mut st = XoodyakHash::new(); 
        
               let mut out = [0u8; 32]; 
        
               st.squeeze(&mut out); 
        
               assert_eq!( 
        
                   out, 
        
                   [ 
        
                       141, 216, 213, 137, 191, 252, 99, 169, 25, 45, 35, 27, 20, 160, 165, 255, 204, 246, 41, 
        
                       214, 87, 39, 76, 114, 39, 130, 131, 52, 124, 189, 128, 53 
        
                   ] 
        
               ); 
        
           }

The hash of the empty string should be EA152F2B47BCE24EFB66C479D4ADF17BD324D806E85FF75EE369EE50DC8F8BD1 which translates to [234, 21, 47, 43, 71, 188, 226, 78, 251, 102, 196, 121, 212, 173, 241, 123, 211, 36, 216, 6, 232, 95, 247, 94, 227, 105, 238, 80, 220, 143, 139, 209].

The root of this issue would be the use of [u8].chunks(rate) in absorb_any etc. instead of Split(X, n) as defined on page 10 of the specification.

Note that adding st.absorb(&[]); to the snippet above does not change the result, but it should (pp. 8–9).

Off-by-one in input validation

rust-xoodyak/src/xoodyak/mod.rs

Line 105 in e8c6bab

if key.len() + key_id.unwrap_or_default().len() > KEYED_ABSORB_RATE {

Quoting the specification: with | K || id | ≤ R_kin − 1.

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	fn test_unkeyed_empty() {
	let mut st = XoodyakHash::new();
	let mut out = [0u8; 32];
	st.squeeze(&mut out);
	assert_eq!(
	out,
	[
	141, 216, 213, 137, 191, 252, 99, 169, 25, 45, 35, 27, 20, 160, 165, 255, 204, 246, 41,
	214, 87, 39, 76, 114, 39, 130, 131, 52, 124, 189, 128, 53
	]
	);
	}