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Code Issues Releases Wiki Activity

Reorganize unsafe code blocks

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This commit is contained in:
Isaiah Inuwa
2026-02-19 11:54:00 -06:00
parent f4efe1fa3c
commit 75c1485974
1 changed files with 34 additions and 23 deletions
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57
apps/desktop/desktop_native/win_webauthn/src/plugin/crypto.rs
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@@ -196,36 +196,47 @@ fn verify_signature(
/// Calculate a SHA-256 hash over some data.
pub(super) fn hash_sha256(data: &[u8]) -> Result<Vec<u8>, windows::core::Error> {
unsafe {
// Hash data
let sha256 = BcryptHash::sha256()?;
BCryptHashData(sha256.handle, data, 0).ok()?;
// Hash data
let sha256 = BcryptHash::sha256()?;
unsafe { BCryptHashData(sha256.handle, data, 0).ok()? };
{
// Get length of SHA256 hash output
tracing::debug!("Getting length of hash output");
let mut hash_output_len_buf = [0; size_of::<u32>()];
let mut bytes_read = 0;
BCryptGetProperty(
BCRYPT_SHA256_ALG_HANDLE.into(),
BCRYPT_HASH_LENGTH,
Some(&mut hash_output_len_buf),
&mut bytes_read,
0,
)
.ok()?;
let hash_output_len = {
let mut hash_output_len_buf = [0; size_of::<u32>()];
let mut bytes_read = 0;
unsafe {
BCryptGetProperty(
BCRYPT_SHA256_ALG_HANDLE.into(),
BCRYPT_HASH_LENGTH,
Some(&mut hash_output_len_buf),
&mut bytes_read,
0,
)
.ok()?;
}
u32::from_ne_bytes(hash_output_len_buf) as usize
};
let hash_output_len = u32::from_ne_bytes(hash_output_len_buf) as usize;
tracing::debug!(" Length of hash output: {hash_output_len}");
tracing::debug!("Completing hash");
let mut hash_buffer: Vec<MaybeUninit<u8>> = Vec::with_capacity(hash_output_len);
{
let hash_slice: &mut [u8] = mem::transmute(hash_buffer.spare_capacity_mut());
BCryptFinishHash(sha256.handle, hash_slice, 0).ok()?;
}
// SAFETY: BCryptFinishHash initializes the buffer
hash_buffer.set_len(hash_output_len);
let hash_buffer: Vec<u8> = mem::transmute(hash_buffer);
let hash_buffer: Vec<u8> = {
let mut hash_buffer: Vec<MaybeUninit<u8>> = Vec::with_capacity(hash_output_len);
unsafe {
{
// Temporarily treat the buffer byte slice to fit BCryptFinishHash parameter arguments.
let hash_slice: &mut [u8] = mem::transmute(hash_buffer.spare_capacity_mut());
BCryptFinishHash(sha256.handle, hash_slice, 0).ok()?;
// The hash handle is not usable after calling BCryptFinishHash, drop to clean up internal state.
drop(sha256);
}
// SAFETY: BCryptFinishHash initializes the buffer
hash_buffer.set_len(hash_output_len);
mem::transmute(hash_buffer)
}
};
tracing::debug!(" Hash: {hash_buffer:?}");
Ok(hash_buffer)
}