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LibWeb: Implement KeyAlgorithms for big-endian

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Dennis Camera 2024-07-03 20:01:15 +02:00 • committed by Andrew Kaster
parent 81a0aa5725
commit 90a2dcfde1
Notes: sideshowbarker 2024-07-17 00:16:31 +09:00
1 changed files with 13 additions and 10 deletions
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23
Userland/Libraries/LibWeb/Crypto/KeyAlgorithms.cpp
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@ -90,8 +90,6 @@ void RsaKeyAlgorithm::visit_edges(Visitor& visitor)
WebIDL::ExceptionOr<void> RsaKeyAlgorithm::set_public_exponent(::Crypto::UnsignedBigInteger exponent)
{
static_assert(AK::HostIsLittleEndian, "This code assumes a little endian host");
auto& realm = this->realm();
auto& vm = this->vm();
@ -99,17 +97,22 @@ WebIDL::ExceptionOr<void> RsaKeyAlgorithm::set_public_exponent(::Crypto::Unsigne
bool const remove_leading_zeroes = true;
auto data_size = exponent.export_data(bytes.span(), remove_leading_zeroes);
auto data_slice = bytes.bytes().slice(bytes.size() - data_size, data_size);
auto data_slice_be = bytes.bytes().slice(bytes.size() - data_size, data_size);
// The BigInteger typedef from the WebCrypto spec requires the bytes in the Uint8Array be ordered in Big Endian
Vector<u8, 32> byte_swapped_data;
byte_swapped_data.ensure_capacity(data_size);
for (size_t i = 0; i < data_size; ++i)
byte_swapped_data.append(data_slice[data_size - i - 1]);
m_public_exponent = TRY(JS::Uint8Array::create(realm, byte_swapped_data.size()));
m_public_exponent->viewed_array_buffer()->buffer().overwrite(0, byte_swapped_data.data(), byte_swapped_data.size());
if constexpr (AK::HostIsLittleEndian) {
Vector<u8, 32> data_slice_le;
data_slice_le.ensure_capacity(data_size);
for (size_t i = 0; i < data_size; ++i) {
data_slice_le.append(data_slice_be[data_size - i - 1]);
}
m_public_exponent = TRY(JS::Uint8Array::create(realm, data_slice_le.size()));
m_public_exponent->viewed_array_buffer()->buffer().overwrite(0, data_slice_le.data(), data_slice_le.size());
} else {
m_public_exponent = TRY(JS::Uint8Array::create(realm, data_slice_be.size()));
m_public_exponent->viewed_array_buffer()->buffer().overwrite(0, data_slice_be.data(), data_slice_be.size());
}
return {};
}