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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "util/crypto/rsa_private_key.h"
#include <stdint.h>
#include <algorithm>
#include <memory>
#include <utility>
#include "openssl/bn.h"
#include "openssl/bytestring.h"
#include "openssl/evp.h"
#include "openssl/mem.h"
#include "openssl/rsa.h"
#include "platform/api/logging.h"
#include "util/crypto/openssl_util.h"
namespace openscreen {
RSAPrivateKey::~RSAPrivateKey() = default;
// static
ErrorOr<RSAPrivateKey> RSAPrivateKey::Create(uint16_t num_bits) {
OpenSSLErrStackTracer err_tracer(CURRENT_LOCATION);
bssl::UniquePtr<RSA> rsa_key(RSA_new());
bssl::UniquePtr<BIGNUM> exponent(BN_new());
if (!rsa_key.get() || !exponent.get() ||
!BN_set_word(exponent.get(), 65537L) ||
!RSA_generate_key_ex(rsa_key.get(), num_bits, exponent.get(), nullptr)) {
return Error::Code::kRSAKeyGenerationFailure;
}
RSAPrivateKey result;
result.key_.reset(EVP_PKEY_new());
if (!result.key_ || !EVP_PKEY_set1_RSA(result.key_.get(), rsa_key.get())) {
return Error::Code::kEVPInitializationError;
}
return result;
}
// static
ErrorOr<RSAPrivateKey> RSAPrivateKey::CreateFromPrivateKeyInfo(
const std::vector<uint8_t>& input) {
OpenSSLErrStackTracer err_tracer(CURRENT_LOCATION);
CBS private_key_cbs;
CBS_init(&private_key_cbs, input.data(), input.size());
bssl::UniquePtr<EVP_PKEY> private_key(
EVP_parse_private_key(&private_key_cbs));
if (!private_key || CBS_len(&private_key_cbs) != 0 ||
EVP_PKEY_id(private_key.get()) != EVP_PKEY_RSA) {
return Error::Code::kEVPInitializationError;
}
RSAPrivateKey result;
result.key_ = std::move(private_key);
return result;
}
// static
ErrorOr<RSAPrivateKey> RSAPrivateKey::CreateFromKey(EVP_PKEY* key) {
OpenSSLErrStackTracer err_tracer(CURRENT_LOCATION);
OSP_DCHECK(key);
if (EVP_PKEY_type(key->type) != EVP_PKEY_RSA) {
return Error::Code::kEVPInitializationError;
}
RSAPrivateKey result;
result.key_ = bssl::UpRef(key);
return result;
}
ErrorOr<RSAPrivateKey> RSAPrivateKey::Copy() const {
OpenSSLErrStackTracer err_tracer(CURRENT_LOCATION);
RSAPrivateKey result;
bssl::UniquePtr<RSA> rsa(EVP_PKEY_get1_RSA(key_.get()));
if (!rsa) {
return Error::Code::kEVPInitializationError;
}
result.key_.reset(EVP_PKEY_new());
if (!EVP_PKEY_set1_RSA(result.key_.get(), rsa.get())) {
return Error::Code::kEVPInitializationError;
}
return result;
}
ErrorOr<std::vector<uint8_t>> RSAPrivateKey::ExportPrivateKey() const {
OpenSSLErrStackTracer err_tracer(CURRENT_LOCATION);
uint8_t* der;
size_t der_len;
bssl::ScopedCBB cbb;
if (!CBB_init(cbb.get(), 0) ||
!EVP_marshal_private_key(cbb.get(), key_.get()) ||
!CBB_finish(cbb.get(), &der, &der_len)) {
return Error::Code::kParseError;
}
std::vector<uint8_t> output(der, der + der_len);
// The temporary buffer has to be freed after we properly copy out data.
OPENSSL_free(der);
return output;
}
ErrorOr<std::vector<uint8_t>> RSAPrivateKey::ExportPublicKey() const {
OpenSSLErrStackTracer err_tracer(CURRENT_LOCATION);
uint8_t* der;
size_t der_len;
bssl::ScopedCBB cbb;
if (!CBB_init(cbb.get(), 0) ||
!EVP_marshal_public_key(cbb.get(), key_.get()) ||
!CBB_finish(cbb.get(), &der, &der_len)) {
return Error::Code::kParseError;
}
std::vector<uint8_t> output(der, der + der_len);
// The temporary buffer has to be freed after we properly copy out data.
OPENSSL_free(der);
return output;
}
RSAPrivateKey::RSAPrivateKey() = default;
} // namespace openscreen
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