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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 <openssl/pkcs12.h>
#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"
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);
crypto::ScopedBIO bio(BIO_new(BIO_s_mem()));
// TODO(eroman): Use the OID specified by webcrypto spec.
// http://crbug.com/373545
if (!i2d_PUBKEY_bio(bio.get(), key))
return Status::ErrorUnexpected();
char* data = NULL;
long len = BIO_get_mem_data(bio.get(), &data);
if (!data || len < 0)
return Status::ErrorUnexpected();
buffer->assign(data, data + len);
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);
crypto::ScopedBIO bio(BIO_new(BIO_s_mem()));
// TODO(eroman): Use the OID specified by webcrypto spec.
// http://crbug.com/373545
if (!i2d_PKCS8PrivateKeyInfo_bio(bio.get(), key))
return Status::ErrorUnexpected();
char* data = NULL;
long len = BIO_get_mem_data(bio.get(), &data);
if (!data || len < 0)
return Status::ErrorUnexpected();
buffer->assign(data, data + len);
return Status::Success();
}
} // namespace
Status CreateWebCryptoPublicKey(crypto::ScopedEVP_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(public_key.Pass(), spki_data),
blink::WebCryptoKeyTypePublic, extractable, algorithm, usages);
return Status::Success();
}
Status CreateWebCryptoPrivateKey(crypto::ScopedEVP_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(private_key.Pass(), pkcs8_data),
blink::WebCryptoKeyTypePrivate, extractable, algorithm, usages);
return Status::Success();
}
Status CheckPrivateKeyCreationUsages(
blink::WebCryptoKeyUsageMask all_possible_usages,
blink::WebCryptoKeyUsageMask actual_usages) {
return CheckKeyCreationUsages(all_possible_usages, actual_usages,
EmptyUsagePolicy::REJECT_EMPTY);
}
Status CheckPublicKeyCreationUsages(
blink::WebCryptoKeyUsageMask all_possible_usages,
blink::WebCryptoKeyUsageMask actual_usages) {
return CheckKeyCreationUsages(all_possible_usages, actual_usages,
EmptyUsagePolicy::ALLOW_EMPTY);
}
Status ImportUnverifiedPkeyFromSpki(const CryptoData& key_data,
int expected_pkey_id,
crypto::ScopedEVP_PKEY* pkey) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
const uint8_t* ptr = key_data.bytes();
pkey->reset(d2i_PUBKEY(nullptr, &ptr, key_data.byte_length()));
if (!pkey->get() || ptr != key_data.bytes() + key_data.byte_length())
return Status::DataError();
if (EVP_PKEY_id(pkey->get()) != expected_pkey_id)
return Status::DataError(); // Data did not define expected key type.
return Status::Success();
}
Status ImportUnverifiedPkeyFromPkcs8(const CryptoData& key_data,
int expected_pkey_id,
crypto::ScopedEVP_PKEY* pkey) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
const uint8_t* ptr = key_data.bytes();
crypto::ScopedOpenSSL<PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO_free> p8inf(
d2i_PKCS8_PRIV_KEY_INFO(nullptr, &ptr, key_data.byte_length()));
if (!p8inf.get() || ptr != key_data.bytes() + key_data.byte_length())
return Status::DataError();
pkey->reset(EVP_PKCS82PKEY(p8inf.get()));
if (!pkey->get())
return Status::DataError();
if (EVP_PKEY_id(pkey->get()) != expected_pkey_id)
return Status::DataError(); // Data did not define expected key type.
return Status::Success();
}
Status VerifyUsagesBeforeImportAsymmetricKey(
blink::WebCryptoKeyFormat format,
blink::WebCryptoKeyUsageMask all_public_key_usages,
blink::WebCryptoKeyUsageMask all_private_key_usages,
blink::WebCryptoKeyUsageMask usages) {
switch (format) {
case blink::WebCryptoKeyFormatSpki:
return CheckPublicKeyCreationUsages(all_public_key_usages, usages);
case blink::WebCryptoKeyFormatPkcs8:
return CheckPrivateKeyCreationUsages(all_private_key_usages, usages);
case blink::WebCryptoKeyFormatJwk: {
// The JWK could represent either a public key or private key. The usages
// must make sense for one of the two. The usages will be checked again by
// ImportKeyJwk() once the key type has been determined.
if (CheckPublicKeyCreationUsages(all_public_key_usages, usages)
.IsError() &&
CheckPrivateKeyCreationUsages(all_private_key_usages, usages)
.IsError()) {
return Status::ErrorCreateKeyBadUsages();
}
return Status::Success();
}
default:
return Status::ErrorUnsupportedImportKeyFormat();
}
}
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, EmptyUsagePolicy::ALLOW_EMPTY);
if (status.IsError())
return status;
*public_usages = combined_usages & all_public_usages;
*private_usages = combined_usages & all_private_usages;
// Ensure that the private key has non-empty usages.
return CheckPrivateKeyCreationUsages(all_private_usages, *private_usages);
}
} // namespace webcrypto
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