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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 "crypto/nss_key_util.h"
#include <cryptohi.h>
#include <keyhi.h>
#include <pk11pub.h>
#include "base/logging.h"
#include "base/stl_util.h"
#include "crypto/nss_util.h"
#if defined(USE_NSS_CERTS)
#include <secmod.h>
#include "crypto/nss_util_internal.h"
#endif
namespace crypto {
namespace {
#if defined(USE_NSS_CERTS)
struct PublicKeyInfoDeleter {
inline void operator()(CERTSubjectPublicKeyInfo* spki) {
SECKEY_DestroySubjectPublicKeyInfo(spki);
}
};
typedef scoped_ptr<CERTSubjectPublicKeyInfo, PublicKeyInfoDeleter>
ScopedPublicKeyInfo;
// Decodes |input| as a SubjectPublicKeyInfo and returns a SECItem containing
// the CKA_ID of that public key or nullptr on error.
ScopedSECItem MakeIDFromSPKI(const std::vector<uint8_t>& input) {
// First, decode and save the public key.
SECItem key_der;
key_der.type = siBuffer;
key_der.data = const_cast<unsigned char*>(vector_as_array(&input));
key_der.len = input.size();
ScopedPublicKeyInfo spki(SECKEY_DecodeDERSubjectPublicKeyInfo(&key_der));
if (!spki)
return nullptr;
ScopedSECKEYPublicKey result(SECKEY_ExtractPublicKey(spki.get()));
if (!result)
return nullptr;
// See pk11_MakeIDFromPublicKey from NSS. For now, only RSA keys are
// supported.
if (SECKEY_GetPublicKeyType(result.get()) != rsaKey)
return nullptr;
return ScopedSECItem(PK11_MakeIDFromPubKey(&result->u.rsa.modulus));
}
#endif // defined(USE_NSS_CERTS)
} // namespace
bool GenerateRSAKeyPairNSS(PK11SlotInfo* slot,
uint16_t num_bits,
bool permanent,
ScopedSECKEYPublicKey* public_key,
ScopedSECKEYPrivateKey* private_key) {
DCHECK(slot);
PK11RSAGenParams param;
param.keySizeInBits = num_bits;
param.pe = 65537L;
SECKEYPublicKey* public_key_raw = nullptr;
private_key->reset(PK11_GenerateKeyPair(slot, CKM_RSA_PKCS_KEY_PAIR_GEN,
¶m, &public_key_raw, permanent,
permanent /* sensitive */, nullptr));
if (!*private_key)
return false;
public_key->reset(public_key_raw);
return true;
}
ScopedSECKEYPrivateKey ImportNSSKeyFromPrivateKeyInfo(
PK11SlotInfo* slot,
const std::vector<uint8_t>& input,
bool permanent) {
DCHECK(slot);
ScopedPLArenaPool arena(PORT_NewArena(DER_DEFAULT_CHUNKSIZE));
DCHECK(arena);
// Excess data is illegal, but NSS silently accepts it, so first ensure that
// |input| consists of a single ASN.1 element.
SECItem input_item;
input_item.data = const_cast<unsigned char*>(vector_as_array(&input));
input_item.len = input.size();
SECItem der_private_key_info;
SECStatus rv =
SEC_QuickDERDecodeItem(arena.get(), &der_private_key_info,
SEC_ASN1_GET(SEC_AnyTemplate), &input_item);
if (rv != SECSuccess)
return nullptr;
// Allow the private key to be used for key unwrapping, data decryption,
// and signature generation.
const unsigned int key_usage =
KU_KEY_ENCIPHERMENT | KU_DATA_ENCIPHERMENT | KU_DIGITAL_SIGNATURE;
SECKEYPrivateKey* key_raw = nullptr;
rv = PK11_ImportDERPrivateKeyInfoAndReturnKey(
slot, &der_private_key_info, nullptr, nullptr, permanent,
permanent /* sensitive */, key_usage, &key_raw, nullptr);
if (rv != SECSuccess)
return nullptr;
return ScopedSECKEYPrivateKey(key_raw);
}
#if defined(USE_NSS_CERTS)
ScopedSECKEYPrivateKey FindNSSKeyFromPublicKeyInfo(
const std::vector<uint8_t>& input) {
EnsureNSSInit();
ScopedSECItem cka_id(MakeIDFromSPKI(input));
if (!cka_id)
return nullptr;
// Search all slots in all modules for the key with the given ID.
AutoSECMODListReadLock auto_lock;
const SECMODModuleList* head = SECMOD_GetDefaultModuleList();
for (const SECMODModuleList* item = head; item != nullptr;
item = item->next) {
int slot_count = item->module->loaded ? item->module->slotCount : 0;
for (int i = 0; i < slot_count; i++) {
// Look for the key in slot |i|.
ScopedSECKEYPrivateKey key(
PK11_FindKeyByKeyID(item->module->slots[i], cka_id.get(), nullptr));
if (key)
return key.Pass();
}
}
// The key wasn't found in any module.
return nullptr;
}
ScopedSECKEYPrivateKey FindNSSKeyFromPublicKeyInfoInSlot(
const std::vector<uint8_t>& input,
PK11SlotInfo* slot) {
DCHECK(slot);
ScopedSECItem cka_id(MakeIDFromSPKI(input));
if (!cka_id)
return nullptr;
return ScopedSECKEYPrivateKey(
PK11_FindKeyByKeyID(slot, cka_id.get(), nullptr));
}
#endif // defined(USE_NSS_CERTS)
} // namespace crypto
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