Issued

October 8, 2021

Package

crypto2 (crates.io)

Type

INFO Unsound

Keywords

#crypto #alignment #unsound

Details

https://github.com/shadowsocks/crypto2/issues/27

Patched

no patched versions

Keywords

#crypto #alignment #unsound

Affected Functions

Version

crypto2::streamcipher::Chacha20::decrypt_slice

• *

crypto2::streamcipher::Chacha20::encrypt_slice

• *

crypto2::streamcipher::xor_si512_inplace

• *

Description

The implementation does not enforce alignment requirements on input slices while incorrectly assuming 4-byte alignment through an unsafe call to std::slice::from_raw_parts_mut, which breaks the contract and introduces undefined behavior.

This affects Chacha20 encryption and decryption in crypto2.