p256_public_key.cc | Explore in Territory

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include "device/fido/p256_public_key.h"

#include <utility>

#include "base/memory/raw_ptr_exclusion.h"
#include "components/cbor/writer.h"
#include "components/device_event_log/device_event_log.h"
#include "device/fido/cbor_extract.h"
#include "device/fido/fido_constants.h"
#include "device/fido/public_key.h"
#include "third_party/boringssl/src/include/openssl/bn.h"
#include "third_party/boringssl/src/include/openssl/bytestring.h"
#include "third_party/boringssl/src/include/openssl/ec.h"
#include "third_party/boringssl/src/include/openssl/evp.h"
#include "third_party/boringssl/src/include/openssl/mem.h"
#include "third_party/boringssl/src/include/openssl/obj.h"

IntKey;
Is;
StepOrByte;
Stop;

namespace device {

// kFieldElementLength is the size of a P-256 field element. The field is
// GF(2^256 - 2^224 + 2^192 + 2^96 - 1) and thus an element is 256 bits, or 32
// bytes.
constexpr size_t kFieldElementLength = …;

// kUncompressedPointLength is the size of an X9.62 uncompressed point over
// P-256. It's one byte of type information followed by two field elements (x
// and y).
constexpr size_t kUncompressedPointLength = …;

namespace {

// DERFromEC_POINT returns the ASN.1, DER, SubjectPublicKeyInfo for a given
// elliptic-curve point.
static std::vector<uint8_t> DERFromEC_POINT(const EC_POINT* point) { … }

}  // namespace

// static
std::unique_ptr<PublicKey> P256PublicKey::ExtractFromU2fRegistrationResponse(
    int32_t algorithm,
    base::span<const uint8_t> u2f_data) { … }

// static
std::unique_ptr<PublicKey> P256PublicKey::ExtractFromCOSEKey(
    int32_t algorithm,
    base::span<const uint8_t> cbor_bytes,
    const cbor::Value::MapValue& map) { … }

// static
std::unique_ptr<PublicKey> P256PublicKey::ParseX962Uncompressed(
    int32_t algorithm,
    base::span<const uint8_t> x962) { … }

// static
std::unique_ptr<PublicKey> P256PublicKey::ParseSpkiDer(
    int32_t algorithm,
    base::span<const uint8_t> spki_der) { … }

}  // namespace device
chromium/device/fido/p256_public_key.cc
