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LibTLS: Add support for curve x448

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stelar7 2022-02-18 17:43:50 +01:00 • committed by Ali Mohammad Pur
parent 0df7ad7493
commit 125a43e203
3 changed files with 78 additions and 16 deletions
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17
Userland/Libraries/LibTLS/HandshakeServer.cpp
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@ -290,21 +290,26 @@ ssize_t TLSv12::handle_dhe_rsa_server_key_exchange(ReadonlyBytes buffer)
ssize_t TLSv12::handle_ecdhe_rsa_server_key_exchange(ReadonlyBytes buffer)
{
auto x25519_key_size_bytes = named_curve_key_size(NamedCurve::x25519) / 8;
if (buffer.size() < x25519_key_size_bytes + 7)
size_t size_required_for_curve_name = 6;
if (buffer.size() < size_required_for_curve_name)
return (i8)Error::NeedMoreData;
auto curve_type = buffer[3];
if (curve_type != (u8)ECCurveType::NamedCurve)
return (i8)Error::NotUnderstood;
auto curve = AK::convert_between_host_and_network_endian(ByteReader::load16(buffer.offset_pointer(4)));
if (curve != (u16)NamedCurve::x25519)
auto curve = static_cast<NamedCurve>(AK::convert_between_host_and_network_endian(ByteReader::load16(buffer.offset_pointer(4))));
if (!m_context.options.elliptic_curves.contains_slow(curve))
return (i8)Error::NotUnderstood;
m_context.server_curve_choice = curve;
auto curve_key_size_bytes = named_curve_key_size(curve) / 8;
if (buffer.size() < curve_key_size_bytes + 1)
return (i8)Error::NeedMoreData;
auto server_public_key_length = buffer[6];
if (server_public_key_length != x25519_key_size_bytes)
return (i8)Error::NotUnderstood;
if (server_public_key_length != curve_key_size_bytes)
return (i8)Error::FeatureNotSupported;
auto server_public_key = buffer.slice(7, server_public_key_length);
auto server_public_key_copy_result = ByteBuffer::copy(server_public_key);