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LibCrypto+LibTLS: Add SECP256r1 support to LibTLS

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Add the required methods to SECP256r1 to conform to the EllipticCurve
virtual base class. Using this updated version of SECP256r1, support in
LibTLS is implemented.
This commit is contained in:
Michiel Visser 2022-03-18 10:39:34 +01:00 • committed by Ali Mohammad Pur
parent c1b041e761
commit 66d99c83d9
5 changed files with 35 additions and 6 deletions
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18
Userland/Libraries/LibCrypto/Curves/SECP256r1.cpp
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@ -6,6 +6,7 @@
#include <AK/ByteReader.h>
#include <AK/Endian.h>
#include <AK/Random.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/UFixedBigInt.h>
@ -346,6 +347,13 @@ bool SECP256r1::is_point_on_curve(JacobianPoint const& point)
return temp.is_zero_constant_time();
}
ErrorOr<ByteBuffer> SECP256r1::generate_private_key()
{
auto buffer = TRY(ByteBuffer::create_uninitialized(32));
fill_with_random(buffer.data(), buffer.size());
return buffer;
}
ErrorOr<ByteBuffer> SECP256r1::generate_public_key(ReadonlyBytes a)
{
// clang-format off
@ -426,4 +434,14 @@ ErrorOr<ByteBuffer> SECP256r1::compute_coordinate(ReadonlyBytes scalar_bytes, Re
return buf;
}
ErrorOr<ByteBuffer> SECP256r1::derive_premaster_key(ReadonlyBytes shared_point)
{
VERIFY(shared_point.size() == 65);
VERIFY(shared_point[0] == 0x04);
ByteBuffer premaster_key = TRY(ByteBuffer::create_uninitialized(32));
premaster_key.overwrite(0, shared_point.data() + 1, 32);
return premaster_key;
}
}