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LibTLS: Remove all uses of VLAs

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This commit is contained in:
Ali Mohammad Pur 2021-05-13 12:27:31 +04:30 • committed by Andreas Kling
parent abda20e25e
commit 98ecb95709
3 changed files with 16 additions and 16 deletions
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25
Userland/Libraries/LibTLS/Exchange.cpp
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@ -101,28 +101,27 @@ void TLSv12::pseudorandom_function(Bytes output, ReadonlyBytes secret, const u8*
// document and in TLS documents published prior to this document when
// TLS 1.2 is negotiated."
// Apparently this PRF _always_ uses SHA256
auto append_label_seed = [&](auto& hmac) {
hmac.update(label, label_length);
hmac.update(seed);
if (seed_b.size() > 0)
hmac.update(seed_b);
};
Crypto::Authentication::HMAC<Crypto::Hash::SHA256> hmac(secret);
append_label_seed(hmac);
auto l_seed_size = label_length + seed.size() + seed_b.size();
u8 l_seed[l_seed_size];
auto label_seed_buffer = Bytes { l_seed, l_seed_size };
label_seed_buffer.overwrite(0, label, label_length);
label_seed_buffer.overwrite(label_length, seed.data(), seed.size());
if (seed_b.size() > 0)
label_seed_buffer.overwrite(label_length + seed.size(), seed_b.data(), seed_b.size());
auto digest_size = hmac.digest_size();
constexpr auto digest_size = hmac.digest_size();
u8 digest[digest_size];
auto digest_0 = Bytes { digest, digest_size };
digest_0.overwrite(0, hmac.process(label_seed_buffer).immutable_data(), digest_size);
digest_0.overwrite(0, hmac.digest().immutable_data(), digest_size);
size_t index = 0;
while (index < output.size()) {
hmac.update(digest_0);
hmac.update(label_seed_buffer);
append_label_seed(hmac);
auto digest_1 = hmac.digest();
auto copy_size = min(digest_size, output.size() - index);