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LibCrypto: Add utility functions to SECPxxxr1

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This allows to move ASN1 logic from inside the `SECPxxxr1` curve
itself to the data structures. It makes more sense to have dedicated and
explicit methods to handle transformation between formats.
This commit is contained in:
devgianlu 2024-12-05 14:28:05 +01:00 • committed by Ali Mohammad Pur
commit bce2893638
Notes: github-actions[bot] 2024-12-07 18:09:49 +00:00
1 changed files with 39 additions and 0 deletions
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39
Libraries/LibCrypto/Curves/SECPxxxr1.h
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@ -8,6 +8,7 @@
#include <AK/ByteBuffer.h>
#include <AK/Endian.h>
#include <AK/Error.h>
#include <AK/MemoryStream.h>
#include <AK/Random.h>
#include <AK/StdLibExtras.h>
@ -17,6 +18,11 @@
#include <LibCrypto/ASN1/DER.h>
#include <LibCrypto/Curves/EllipticCurve.h>
namespace {
// Used by ASN1 macros
static String s_error_string;
}
namespace Crypto::Curves {
struct SECPxxxr1CurveParameters {
@ -31,6 +37,18 @@ struct SECPxxxr1Point {
UnsignedBigInteger x;
UnsignedBigInteger y;
static ErrorOr<SECPxxxr1Point> from_uncompressed(ReadonlyBytes data)
{
if (data.size() < 1 || data[0] != 0x04)
return Error::from_string_literal("Invalid length or not an uncompressed SECPxxxr1 point");
auto half_size = (data.size() - 1) / 2;
return SECPxxxr1Point {
UnsignedBigInteger::import_data(data.slice(1, half_size)),
UnsignedBigInteger::import_data(data.slice(1 + half_size, half_size)),
};
}
ErrorOr<ByteBuffer> to_uncompressed() const
{
auto bytes = TRY(ByteBuffer::create_uninitialized(1 + x.byte_length() + y.byte_length()));
@ -44,6 +62,27 @@ struct SECPxxxr1Point {
struct SECPxxxr1Signature {
UnsignedBigInteger r;
UnsignedBigInteger s;
static ErrorOr<SECPxxxr1Signature> from_asn(ReadonlyBytes signature, Vector<StringView> current_scope)
{
ASN1::Decoder decoder(signature);
ENTER_TYPED_SCOPE(Sequence, "SECPxxxr1Signature");
READ_OBJECT(Integer, UnsignedBigInteger, r_big_int);
READ_OBJECT(Integer, UnsignedBigInteger, s_big_int);
return SECPxxxr1Signature { r_big_int, s_big_int };
}
ErrorOr<ByteBuffer> to_asn()
{
ASN1::Encoder encoder;
TRY(encoder.write_constructed(ASN1::Class::Universal, ASN1::Kind::Sequence, [&]() -> ErrorOr<void> {
TRY(encoder.write(r));
TRY(encoder.write(s));
return {};
}));
return encoder.finish();
}
};
template<size_t bit_size, SECPxxxr1CurveParameters const& CURVE_PARAMETERS>