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// Copyright 2015 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 "components/webcrypto/algorithms/asymmetric_key_util.h"
#include <stdint.h>
#include <utility>
#include "components/webcrypto/algorithms/util.h"
#include "components/webcrypto/blink_key_handle.h"
#include "components/webcrypto/crypto_data.h"
#include "components/webcrypto/generate_key_result.h"
#include "components/webcrypto/status.h"
#include "crypto/openssl_util.h"
#include "third_party/boringssl/src/include/openssl/bytestring.h"
#include "third_party/boringssl/src/include/openssl/evp.h"
#include "third_party/boringssl/src/include/openssl/mem.h"
namespace webcrypto {
namespace {
// Exports an EVP_PKEY public key to the SPKI format.
Status ExportPKeySpki(EVP_PKEY* key, std::vector<uint8_t>* buffer) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
uint8_t* der;
size_t der_len;
bssl::ScopedCBB cbb;
if (!CBB_init(cbb.get(), 0) || !EVP_marshal_public_key(cbb.get(), key) ||
!CBB_finish(cbb.get(), &der, &der_len)) {
return Status::ErrorUnexpected();
}
buffer->assign(der, der + der_len);
OPENSSL_free(der);
return Status::Success();
}
// Exports an EVP_PKEY private key to the PKCS8 format.
Status ExportPKeyPkcs8(EVP_PKEY* key, std::vector<uint8_t>* buffer) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
// TODO(eroman): Use the OID specified by webcrypto spec.
// http://crbug.com/373545
uint8_t* der;
size_t der_len;
bssl::ScopedCBB cbb;
if (!CBB_init(cbb.get(), 0) || !EVP_marshal_private_key(cbb.get(), key) ||
!CBB_finish(cbb.get(), &der, &der_len)) {
return Status::ErrorUnexpected();
}
buffer->assign(der, der + der_len);
OPENSSL_free(der);
return Status::Success();
}
} // namespace
Status CreateWebCryptoPublicKey(bssl::UniquePtr<EVP_PKEY> public_key,
const blink::WebCryptoKeyAlgorithm& algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
blink::WebCryptoKey* key) {
// Serialize the key at creation time so that if structured cloning is
// requested it can be done synchronously from the Blink thread.
std::vector<uint8_t> spki_data;
Status status = ExportPKeySpki(public_key.get(), &spki_data);
if (status.IsError())
return status;
*key = blink::WebCryptoKey::create(
CreateAsymmetricKeyHandle(std::move(public_key), spki_data),
blink::WebCryptoKeyTypePublic, extractable, algorithm, usages);
return Status::Success();
}
Status CreateWebCryptoPrivateKey(bssl::UniquePtr<EVP_PKEY> private_key,
const blink::WebCryptoKeyAlgorithm& algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
blink::WebCryptoKey* key) {
// Serialize the key at creation time so that if structured cloning is
// requested it can be done synchronously from the Blink thread.
std::vector<uint8_t> pkcs8_data;
Status status = ExportPKeyPkcs8(private_key.get(), &pkcs8_data);
if (status.IsError())
return status;
*key = blink::WebCryptoKey::create(
CreateAsymmetricKeyHandle(std::move(private_key), pkcs8_data),
blink::WebCryptoKeyTypePrivate, extractable, algorithm, usages);
return Status::Success();
}
Status ImportUnverifiedPkeyFromSpki(const CryptoData& key_data,
int expected_pkey_id,
bssl::UniquePtr<EVP_PKEY>* out_pkey) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
CBS cbs;
CBS_init(&cbs, key_data.bytes(), key_data.byte_length());
bssl::UniquePtr<EVP_PKEY> pkey(EVP_parse_public_key(&cbs));
if (!pkey || CBS_len(&cbs) != 0)
return Status::DataError();
if (EVP_PKEY_id(pkey.get()) != expected_pkey_id)
return Status::DataError(); // Data did not define expected key type.
*out_pkey = std::move(pkey);
return Status::Success();
}
Status ImportUnverifiedPkeyFromPkcs8(const CryptoData& key_data,
int expected_pkey_id,
bssl::UniquePtr<EVP_PKEY>* out_pkey) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
CBS cbs;
CBS_init(&cbs, key_data.bytes(), key_data.byte_length());
bssl::UniquePtr<EVP_PKEY> pkey(EVP_parse_private_key(&cbs));
if (!pkey || CBS_len(&cbs) != 0)
return Status::DataError();
if (EVP_PKEY_id(pkey.get()) != expected_pkey_id)
return Status::DataError(); // Data did not define expected key type.
*out_pkey = std::move(pkey);
return Status::Success();
}
Status GetUsagesForGenerateAsymmetricKey(
blink::WebCryptoKeyUsageMask combined_usages,
blink::WebCryptoKeyUsageMask all_public_usages,
blink::WebCryptoKeyUsageMask all_private_usages,
blink::WebCryptoKeyUsageMask* public_usages,
blink::WebCryptoKeyUsageMask* private_usages) {
// Ensure that the combined usages is a subset of the total possible usages.
Status status = CheckKeyCreationUsages(all_public_usages | all_private_usages,
combined_usages);
if (status.IsError())
return status;
*public_usages = combined_usages & all_public_usages;
*private_usages = combined_usages & all_private_usages;
// NOTE: empty private_usages is allowed at this layer. Such keys will be
// rejected at a higher layer.
return Status::Success();
}
} // namespace webcrypto
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