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// Copyright 2014 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 "content/child/webcrypto/nss/aes_key_nss.h"
#include "base/logging.h"
#include "content/child/webcrypto/crypto_data.h"
#include "content/child/webcrypto/jwk.h"
#include "content/child/webcrypto/nss/key_nss.h"
#include "content/child/webcrypto/nss/sym_key_nss.h"
#include "content/child/webcrypto/status.h"
#include "content/child/webcrypto/webcrypto_util.h"
#include "third_party/WebKit/public/platform/WebCryptoKeyAlgorithm.h"
namespace content {
namespace webcrypto {
AesAlgorithm::AesAlgorithm(CK_MECHANISM_TYPE import_mechanism,
CK_FLAGS import_flags,
blink::WebCryptoKeyUsageMask all_key_usages,
const std::string& jwk_suffix)
: import_mechanism_(import_mechanism),
import_flags_(import_flags),
all_key_usages_(all_key_usages),
jwk_suffix_(jwk_suffix) {
}
AesAlgorithm::AesAlgorithm(CK_MECHANISM_TYPE import_mechanism,
const std::string& jwk_suffix)
: import_mechanism_(import_mechanism),
import_flags_(CKF_ENCRYPT | CKF_DECRYPT),
all_key_usages_(blink::WebCryptoKeyUsageEncrypt |
blink::WebCryptoKeyUsageDecrypt |
blink::WebCryptoKeyUsageWrapKey |
blink::WebCryptoKeyUsageUnwrapKey),
jwk_suffix_(jwk_suffix) {
}
Status AesAlgorithm::GenerateKey(const blink::WebCryptoAlgorithm& algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
GenerateKeyResult* result) const {
Status status = CheckKeyCreationUsages(all_key_usages_, usages);
if (status.IsError())
return status;
unsigned int keylen_bits;
status = GetAesKeyGenLengthInBits(algorithm.aesKeyGenParams(), &keylen_bits);
if (status.IsError())
return status;
return GenerateSecretKeyNss(
blink::WebCryptoKeyAlgorithm::createAes(algorithm.id(), keylen_bits),
extractable,
usages,
keylen_bits / 8,
CKM_AES_KEY_GEN,
result);
}
Status AesAlgorithm::VerifyKeyUsagesBeforeImportKey(
blink::WebCryptoKeyFormat format,
blink::WebCryptoKeyUsageMask usages) const {
switch (format) {
case blink::WebCryptoKeyFormatRaw:
case blink::WebCryptoKeyFormatJwk:
return CheckKeyCreationUsages(all_key_usages_, usages);
default:
return Status::ErrorUnsupportedImportKeyFormat();
}
}
Status AesAlgorithm::ImportKeyRaw(const CryptoData& key_data,
const blink::WebCryptoAlgorithm& algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
blink::WebCryptoKey* key) const {
const unsigned int keylen_bytes = key_data.byte_length();
Status status = VerifyAesKeyLengthForImport(keylen_bytes);
if (status.IsError())
return status;
// No possibility of overflow.
unsigned int keylen_bits = keylen_bytes * 8;
return ImportKeyRawNss(
key_data,
blink::WebCryptoKeyAlgorithm::createAes(algorithm.id(), keylen_bits),
extractable,
usages,
import_mechanism_,
import_flags_,
key);
}
Status AesAlgorithm::ImportKeyJwk(const CryptoData& key_data,
const blink::WebCryptoAlgorithm& algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
blink::WebCryptoKey* key) const {
std::vector<uint8_t> raw_data;
Status status = ReadAesSecretKeyJwk(
key_data, jwk_suffix_, extractable, usages, &raw_data);
if (status.IsError())
return status;
return ImportKeyRaw(
CryptoData(raw_data), algorithm, extractable, usages, key);
}
Status AesAlgorithm::ExportKeyRaw(const blink::WebCryptoKey& key,
std::vector<uint8_t>* buffer) const {
*buffer = SymKeyNss::Cast(key)->raw_key_data();
return Status::Success();
}
Status AesAlgorithm::ExportKeyJwk(const blink::WebCryptoKey& key,
std::vector<uint8_t>* buffer) const {
SymKeyNss* sym_key = SymKeyNss::Cast(key);
const std::vector<uint8_t>& raw_data = sym_key->raw_key_data();
WriteSecretKeyJwk(CryptoData(raw_data),
MakeJwkAesAlgorithmName(jwk_suffix_, raw_data.size()),
key.extractable(),
key.usages(),
buffer);
return Status::Success();
}
Status AesAlgorithm::SerializeKeyForClone(
const blink::WebCryptoKey& key,
blink::WebVector<uint8_t>* key_data) const {
key_data->assign(SymKeyNss::Cast(key)->serialized_key_data());
return Status::Success();
}
Status AesAlgorithm::DeserializeKeyForClone(
const blink::WebCryptoKeyAlgorithm& algorithm,
blink::WebCryptoKeyType type,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
const CryptoData& key_data,
blink::WebCryptoKey* key) const {
return ImportKeyRaw(key_data, CreateAlgorithm(algorithm.id()), extractable,
usages, key);
}
} // namespace webcrypto
} // namespace content
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