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Check the size of the nonce

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This commit is contained in:
Rodolphe Bréard 2024-03-24 12:17:29 +01:00
parent ca86747862
commit 747163f433
1 changed files with 11 additions and 3 deletions
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14
src/scheme/xchacha20poly1305.rs
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@ -1,11 +1,13 @@
use crate::encrypted_data::EncryptedData; use crate::encrypted_data::EncryptedData;
use crate::error::Result; use crate::error::{Error, Result};
use chacha20poly1305::aead::{Aead, KeyInit, Payload}; use chacha20poly1305::aead::{Aead, KeyInit, Payload};
use chacha20poly1305::{Key, XChaCha20Poly1305, XNonce}; use chacha20poly1305::{Key, XChaCha20Poly1305, XNonce};
// X-variant: the nonce's size is 192 bits (24 bytes)
const NONCE_SIZE: usize = 24;
pub(crate) fn xchacha20poly1305_gen_nonce() -> Result<Vec<u8>> { pub(crate) fn xchacha20poly1305_gen_nonce() -> Result<Vec<u8>> {
// X-variant: the nonce's size is 192 bits (24 bytes) let mut nonce: [u8; NONCE_SIZE] = [0; NONCE_SIZE];
let mut nonce: [u8; 24] = [0; 24];
getrandom::getrandom(&mut nonce)?; getrandom::getrandom(&mut nonce)?;
Ok(nonce.to_vec()) Ok(nonce.to_vec())
} }
@ -44,6 +46,12 @@ pub(crate) fn xchacha20poly1305_decrypt(
) -> Result<Vec<u8>> { ) -> Result<Vec<u8>> {
// Adapt the key and nonce // Adapt the key and nonce
let key = Key::from_slice(key); let key = Key::from_slice(key);
if encrypted_data.nonce.len() != NONCE_SIZE {
return Err(Error::InvalidNonceSize(
NONCE_SIZE,
encrypted_data.nonce.len(),
));
}
let nonce = XNonce::from_slice(&encrypted_data.nonce); let nonce = XNonce::from_slice(&encrypted_data.nonce);
// Prepare the payload // Prepare the payload