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Rust HMAC-BLAKE2: require exact output buffer size

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This commit is contained in:
Josh Holtrop
2026-01-20 15:31:58 -05:00
parent e59ddb95c7
commit 4a92ee31bb
1 changed files with 14 additions and 6 deletions
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20
wrapper/rust/wolfssl-wolfcrypt/src/blake2.rs
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@@ -176,6 +176,9 @@ pub struct BLAKE2bHmac {
#[cfg(blake2b_hmac)]
impl BLAKE2bHmac {
/// HMAC-BLAKE2b digest size.
pub const DIGEST_SIZE: usize = sys::WC_BLAKE2B_DIGEST_SIZE as usize;
/// Build a new BLAKE2bHmac instance.
///
/// # Parameters
@@ -264,7 +267,7 @@ impl BLAKE2bHmac {
/// let mut mac = [0u8; 64];
/// hmac_blake2b.finalize(&key, &mut mac).expect("Error with finalize()");
/// ```
pub fn finalize(&mut self, key: &[u8], mac: &mut [u8]) -> Result<(), i32> {
pub fn finalize(&mut self, key: &[u8], mac: &mut [u8; Self::DIGEST_SIZE]) -> Result<(), i32> {
let rc = unsafe {
sys::wc_Blake2bHmacFinal(&mut self.wc_blake2b,
key.as_ptr(), key.len(), mac.as_mut_ptr(), mac.len())
@@ -282,13 +285,14 @@ impl BLAKE2bHmac {
///
/// * `data`: Input data to create MAC from.
/// * `key`: Key to use for MAC creation.
/// * `out`: Buffer in which to store the computed MAC.
/// * `out`: Buffer in which to store the computed MAC. It must be 64 bytes
/// long.
///
/// # Returns
///
/// Returns either Ok(()) on success or Err(e) containing the wolfSSL
/// library error code value.
pub fn hmac(data: &[u8], key: &[u8], out: &mut [u8]) -> Result<(), i32> {
pub fn hmac(data: &[u8], key: &[u8], out: &mut [u8; Self::DIGEST_SIZE]) -> Result<(), i32> {
let rc = unsafe {
sys::wc_Blake2bHmac(data.as_ptr(), data.len(), key.as_ptr(),
key.len(), out.as_mut_ptr(), out.len())
@@ -449,6 +453,9 @@ pub struct BLAKE2sHmac {
#[cfg(blake2s_hmac)]
impl BLAKE2sHmac {
/// HMAC-BLAKE2s digest size.
pub const DIGEST_SIZE: usize = sys::WC_BLAKE2S_DIGEST_SIZE as usize;
/// Build a new BLAKE2sHmac instance.
///
/// # Parameters
@@ -537,7 +544,7 @@ impl BLAKE2sHmac {
/// let mut mac = [0u8; 32];
/// hmac_blake2s.finalize(&key, &mut mac).expect("Error with finalize()");
/// ```
pub fn finalize(&mut self, key: &[u8], mac: &mut [u8]) -> Result<(), i32> {
pub fn finalize(&mut self, key: &[u8], mac: &mut [u8; Self::DIGEST_SIZE]) -> Result<(), i32> {
let rc = unsafe {
sys::wc_Blake2sHmacFinal(&mut self.wc_blake2s,
key.as_ptr(), key.len(), mac.as_mut_ptr(), mac.len())
@@ -555,13 +562,14 @@ impl BLAKE2sHmac {
///
/// * `data`: Input data to create MAC from.
/// * `key`: Key to use for MAC creation.
/// * `out`: Buffer in which to store the computed MAC.
/// * `out`: Buffer in which to store the computed MAC. It must be 32 bytes
/// long.
///
/// # Returns
///
/// Returns either Ok(()) on success or Err(e) containing the wolfSSL
/// library error code value.
pub fn hmac(data: &[u8], key: &[u8], out: &mut [u8]) -> Result<(), i32> {
pub fn hmac(data: &[u8], key: &[u8], out: &mut [u8; Self::DIGEST_SIZE]) -> Result<(), i32> {
let rc = unsafe {
sys::wc_Blake2sHmac(data.as_ptr(), data.len(), key.as_ptr(),
key.len(), out.as_mut_ptr(), out.len())