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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "crypto/keypair.h"
#include "base/logging.h"
#include "crypto/openssl_util.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/rsa.h"
namespace crypto::keypair {
namespace {
bssl::UniquePtr<EVP_PKEY> GenerateRsa(size_t bits) {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
bssl::UniquePtr<RSA> rsa_key(RSA_new());
bssl::UniquePtr<BIGNUM> bn(BN_new());
CHECK(rsa_key.get());
CHECK(bn.get());
CHECK(BN_set_word(bn.get(), 65537L));
CHECK(RSA_generate_key_ex(rsa_key.get(), bits, bn.get(), nullptr));
bssl::UniquePtr<EVP_PKEY> key(EVP_PKEY_new());
CHECK(EVP_PKEY_set1_RSA(key.get(), rsa_key.get()));
return key;
}
bool IsSupportedEvpId(int evp_id) {
return evp_id == EVP_PKEY_RSA || evp_id == EVP_PKEY_EC;
}
std::vector<uint8_t> ExportEVPPublicKey(EVP_PKEY* pkey) {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
bssl::ScopedCBB cbb;
CHECK(CBB_init(cbb.get(), 0));
CHECK(EVP_marshal_public_key(cbb.get(), pkey));
uint8_t* data;
size_t len;
CHECK(CBB_finish(cbb.get(), &data, &len));
std::vector<uint8_t> result(len);
// SAFETY: OpenSSL freshly allocated data for us and ensured it pointed to at
// least len bytes.
UNSAFE_BUFFERS(result.assign(data, data + len));
OPENSSL_free(data);
return result;
}
} // namespace
PrivateKey::PrivateKey(bssl::UniquePtr<EVP_PKEY> key, crypto::SubtlePassKey)
: PrivateKey(std::move(key)) {}
PrivateKey::~PrivateKey() = default;
PrivateKey::PrivateKey(PrivateKey&& other) = default;
PrivateKey::PrivateKey(const PrivateKey& other)
: key_(bssl::UpRef(const_cast<PrivateKey&>(other).key())) {}
PrivateKey& PrivateKey::operator=(PrivateKey&& other) = default;
PrivateKey& PrivateKey::operator=(const PrivateKey& other) {
key_ = bssl::UpRef(const_cast<PrivateKey&>(other).key());
return *this;
}
// static
PrivateKey PrivateKey::GenerateRsa2048() {
return PrivateKey(GenerateRsa(2048));
}
// static
PrivateKey PrivateKey::GenerateRsa4096() {
return PrivateKey(GenerateRsa(4096));
}
// static
PrivateKey PrivateKey::GenerateEcP256() {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
bssl::UniquePtr<EC_KEY> ec_key(
EC_KEY_new_by_curve_name(NID_X9_62_prime256v1));
CHECK(ec_key);
CHECK(EC_KEY_generate_key(ec_key.get()));
bssl::UniquePtr<EVP_PKEY> key(EVP_PKEY_new());
CHECK(EVP_PKEY_set1_EC_KEY(key.get(), ec_key.get()));
return PrivateKey(std::move(key));
}
// static
std::optional<PrivateKey> PrivateKey::FromPrivateKeyInfo(
base::span<const uint8_t> pki) {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
CBS cbs(pki);
bssl::UniquePtr<EVP_PKEY> pkey(EVP_parse_private_key(&cbs));
if (!pkey || CBS_len(&cbs) != 0) {
LOG(WARNING) << "Malformed PrivateKeyInfo or trailing data";
return std::nullopt;
}
auto id = EVP_PKEY_id(pkey.get());
if (!IsSupportedEvpId(id)) {
LOG(WARNING) << "Unsupported key type (EVP ID: " << id << ")";
return std::nullopt;
}
return std::optional<PrivateKey>(PrivateKey(std::move(pkey)));
}
std::vector<uint8_t> PrivateKey::ToPrivateKeyInfo() const {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
bssl::ScopedCBB cbb;
CHECK(CBB_init(cbb.get(), 0));
CHECK(EVP_marshal_private_key(cbb.get(), key_.get()));
uint8_t* data;
size_t len;
CHECK(CBB_finish(cbb.get(), &data, &len));
std::vector<uint8_t> result(len);
// SAFETY: OpenSSL freshly allocated data for us and ensured it pointed to at
// least len bytes.
UNSAFE_BUFFERS(result.assign(data, data + len));
OPENSSL_free(data);
return result;
}
std::vector<uint8_t> PrivateKey::ToSubjectPublicKeyInfo() const {
return ExportEVPPublicKey(key_.get());
}
std::vector<uint8_t> PrivateKey::ToUncompressedForm() const {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
std::vector<uint8_t> buf(65);
EC_KEY* ec_key = EVP_PKEY_get0_EC_KEY(key_.get());
CHECK(EC_POINT_point2oct(
EC_KEY_get0_group(ec_key), EC_KEY_get0_public_key(ec_key),
POINT_CONVERSION_UNCOMPRESSED, buf.data(), buf.size(), /*ctx=*/nullptr));
return buf;
}
PrivateKey::PrivateKey(bssl::UniquePtr<EVP_PKEY> key) : key_(std::move(key)) {}
bool PrivateKey::IsRsa() const {
return EVP_PKEY_id(key_.get()) == EVP_PKEY_RSA;
}
bool PrivateKey::IsEc() const {
return EVP_PKEY_id(key_.get()) == EVP_PKEY_EC;
}
PublicKey::PublicKey(bssl::UniquePtr<EVP_PKEY> key, crypto::SubtlePassKey)
: PublicKey(std::move(key)) {}
PublicKey::~PublicKey() = default;
PublicKey::PublicKey(PublicKey&& other) = default;
PublicKey::PublicKey(const PublicKey& other)
: key_(bssl::UpRef(const_cast<PublicKey&>(other).key())) {}
PublicKey& PublicKey::operator=(PublicKey&& other) = default;
PublicKey& PublicKey::operator=(const PublicKey& other) {
key_ = bssl::UpRef(const_cast<PublicKey&>(other).key());
return *this;
}
// static
PublicKey PublicKey::FromPrivateKey(const PrivateKey& key) {
return *FromSubjectPublicKeyInfo(key.ToSubjectPublicKeyInfo());
}
// static
std::optional<PublicKey> PublicKey::FromSubjectPublicKeyInfo(
base::span<const uint8_t> spki) {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
CBS cbs(spki);
bssl::UniquePtr<EVP_PKEY> pkey(EVP_parse_public_key(&cbs));
if (!pkey || CBS_len(&cbs) != 0) {
LOG(WARNING) << "Malformed PublicKeyInfo or trailing data";
return std::nullopt;
}
auto id = EVP_PKEY_id(pkey.get());
if (!IsSupportedEvpId(id)) {
LOG(WARNING) << "Unsupported key type (EVP ID: " << id << ")";
return std::nullopt;
}
return std::optional<PublicKey>(PublicKey(std::move(pkey)));
}
std::vector<uint8_t> PublicKey::ToSubjectPublicKeyInfo() const {
return ExportEVPPublicKey(key_.get());
}
bool PublicKey::IsRsa() const {
return EVP_PKEY_id(key_.get()) == EVP_PKEY_RSA;
}
bool PublicKey::IsEc() const {
return EVP_PKEY_id(key_.get()) == EVP_PKEY_EC;
}
PublicKey::PublicKey(bssl::UniquePtr<EVP_PKEY> key) : key_(std::move(key)) {}
} // namespace crypto::keypair
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