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LibCrypto: Remove all uses of VLAs

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This removes all uses of VLAs with either Vectors with inline capacity
for the expected soft upper bound, or the occasional heap allocation.
This commit is contained in:
Ali Mohammad Pur 2021-05-13 12:13:11 +04:30 • committed by Andreas Kling
parent 0d50d3ed1e
commit b05beb79d4
7 changed files with 41 additions and 36 deletions
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10
Userland/Libraries/LibCrypto/Authentication/HMAC.h
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@ -25,7 +25,7 @@ public:
using HashType = HashT;
using TagType = typename HashType::DigestType;
size_t digest_size() const { return m_inner_hasher.digest_size(); }
constexpr size_t digest_size() const { return m_inner_hasher.digest_size(); }
template<typename KeyBufferType, typename... Args>
HMAC(KeyBufferType key, Args... args)
@ -82,9 +82,11 @@ private:
void derive_key(const u8* key, size_t length)
{
auto block_size = m_inner_hasher.block_size();
u8 v_key[block_size];
__builtin_memset(v_key, 0, block_size);
auto key_buffer = Bytes { v_key, block_size };
// Note: The block size of all the current hash functions is 512 bits.
Vector<u8, 64> v_key;
v_key.resize(block_size);
__builtin_memset(v_key.data(), 0, block_size);
auto key_buffer = v_key.span();
// m_key_data is zero'd, so copying the data in
// the first few bytes leaves the rest zero, which
// is exactly what we want (zero padding)