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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 "components/webcrypto/openssl/util_openssl.h"
#include <openssl/evp.h>
#include <openssl/pkcs12.h>
#include <openssl/rand.h>
#include "base/stl_util.h"
#include "components/webcrypto/crypto_data.h"
#include "components/webcrypto/generate_key_result.h"
#include "components/webcrypto/openssl/key_openssl.h"
#include "components/webcrypto/platform_crypto.h"
#include "components/webcrypto/status.h"
#include "components/webcrypto/webcrypto_util.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
void PlatformInit() {
crypto::EnsureOpenSSLInit();
}
const EVP_MD* GetDigest(blink::WebCryptoAlgorithmId id) {
switch (id) {
case blink::WebCryptoAlgorithmIdSha1:
return EVP_sha1();
case blink::WebCryptoAlgorithmIdSha256:
return EVP_sha256();
case blink::WebCryptoAlgorithmIdSha384:
return EVP_sha384();
case blink::WebCryptoAlgorithmIdSha512:
return EVP_sha512();
default:
return NULL;
}
}
Status AeadEncryptDecrypt(EncryptOrDecrypt mode,
const std::vector<uint8_t>& raw_key,
const CryptoData& data,
unsigned int tag_length_bytes,
const CryptoData& iv,
const CryptoData& additional_data,
const EVP_AEAD* aead_alg,
std::vector<uint8_t>* buffer) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
EVP_AEAD_CTX ctx;
if (!aead_alg)
return Status::ErrorUnexpected();
if (!EVP_AEAD_CTX_init(&ctx, aead_alg, vector_as_array(&raw_key),
raw_key.size(), tag_length_bytes, NULL)) {
return Status::OperationError();
}
crypto::ScopedOpenSSL<EVP_AEAD_CTX, EVP_AEAD_CTX_cleanup> ctx_cleanup(&ctx);
size_t len;
int ok;
if (mode == DECRYPT) {
if (data.byte_length() < tag_length_bytes)
return Status::ErrorDataTooSmall();
buffer->resize(data.byte_length() - tag_length_bytes);
ok = EVP_AEAD_CTX_open(&ctx, vector_as_array(buffer), &len, buffer->size(),
iv.bytes(), iv.byte_length(), data.bytes(),
data.byte_length(), additional_data.bytes(),
additional_data.byte_length());
} else {
// No need to check for unsigned integer overflow here (seal fails if
// the output buffer is too small).
buffer->resize(data.byte_length() + EVP_AEAD_max_overhead(aead_alg));
ok = EVP_AEAD_CTX_seal(&ctx, vector_as_array(buffer), &len, buffer->size(),
iv.bytes(), iv.byte_length(), data.bytes(),
data.byte_length(), additional_data.bytes(),
additional_data.byte_length());
}
if (!ok)
return Status::OperationError();
buffer->resize(len);
return Status::Success();
}
Status GenerateWebCryptoSecretKey(const blink::WebCryptoKeyAlgorithm& algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
unsigned int keylen_bits,
GenerateKeyResult* result) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
unsigned int keylen_bytes = NumBitsToBytes(keylen_bits);
std::vector<unsigned char> random_bytes(keylen_bytes, 0);
if (keylen_bytes > 0) {
if (!(RAND_bytes(&random_bytes[0], keylen_bytes)))
return Status::OperationError();
TruncateToBitLength(keylen_bits, &random_bytes);
}
result->AssignSecretKey(blink::WebCryptoKey::create(
new SymKeyOpenSsl(CryptoData(random_bytes)),
blink::WebCryptoKeyTypeSecret, extractable, algorithm, usages));
return Status::Success();
}
Status CreateWebCryptoSecretKey(const CryptoData& key_data,
const blink::WebCryptoKeyAlgorithm& algorithm,
bool extractable,
blink::WebCryptoKeyUsageMask usages,
blink::WebCryptoKey* key) {
*key = blink::WebCryptoKey::create(new SymKeyOpenSsl(key_data),
blink::WebCryptoKeyTypeSecret, extractable,
algorithm, usages);
return Status::Success();
}
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(
new AsymKeyOpenSsl(public_key.Pass(), CryptoData(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(
new AsymKeyOpenSsl(private_key.Pass(), CryptoData(pkcs8_data)),
blink::WebCryptoKeyTypePrivate, extractable, algorithm, usages);
return Status::Success();
}
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();
}
BIGNUM* CreateBIGNUM(const std::string& n) {
return BN_bin2bn(reinterpret_cast<const uint8_t*>(n.data()), n.size(), NULL);
}
std::vector<uint8_t> BIGNUMToVector(const BIGNUM* n) {
std::vector<uint8_t> v(BN_num_bytes(n));
BN_bn2bin(n, vector_as_array(&v));
return v;
}
} // namespace webcrypto
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