[webcrypto] Wire up {spki, pkcs8} import/export for OpenSSL.

content/child/webcrypto/openssl/rsa_key_openssl.cc

+// 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/openssl/rsa_key_openssl.h"
+
+#include <openssl/evp.h>
+#include <openssl/pkcs12.h>
+
+#include "base/logging.h"
+#include "content/child/webcrypto/crypto_data.h"
+#include "content/child/webcrypto/openssl/key_openssl.h"
+#include "content/child/webcrypto/status.h"
+#include "content/child/webcrypto/webcrypto_util.h"
+#include "crypto/openssl_util.h"
+#include "crypto/scoped_openssl_types.h"
+#include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
+#include "third_party/WebKit/public/platform/WebCryptoKeyAlgorithm.h"
+
+namespace content {
+
+namespace webcrypto {
+
+namespace {
+
+Status ExportPKeySpki(EVP_PKEY* key, std::vector<uint8>* 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))

[agl, 2014/07/18 16:55:19]

This is fine, although if it doesn't allow control of the OIDs as needed, it
might be a reason to rewrite it in BoringSSL with the CBB functions.

[eroman, 2014/07/18 20:17:31]

Acknowledged.

+    return Status::ErrorUnexpected();
+
+  uint8* data = NULL;
+  long len = BIO_get_mem_data(bio.get(), &data);

[agl, 2014/07/18 16:55:18]

this will fail with BoringSSL because BIO_get_mem_data is now a function not a
macro and the second argument is a char**.

However, I agree that it should be a uint8_t. Also BIO_get_mem_data returns zero
on error and when the buffer is empty.

I've added BIO_mem_contents to fix this:
https://boringssl-review.googlesource.com/#/c/1261/

If it's not rolled into Chromium when this lands, I'll fix this up once it is.

[eroman, 2014/07/18 20:17:31]

Done.

+  if (!data || len < 0)
+    return Status::ErrorUnexpected();
+
+  buffer->assign(data, data + len);
+  return Status::Success();
+}
+
+Status ExportPKeyPkcs8(EVP_PKEY* key, std::vector<uint8>* 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))

[agl, 2014/07/18 16:55:19]

ditto here and about BIO_get_mem_data.

[eroman, 2014/07/18 20:17:31]

Done.

+    return Status::ErrorUnexpected();
+
+  uint8* 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();
+}
+
+// Creates a blink::WebCryptoAlgorithm having the modulus length and public
+// exponent  of |key|.
+Status CreateRsaHashedKeyAlgorithm(
+    blink::WebCryptoAlgorithmId rsa_algorithm,
+    blink::WebCryptoAlgorithmId hash_algorithm,
+    EVP_PKEY* key,
+    blink::WebCryptoKeyAlgorithm* key_algorithm) {
+  DCHECK(IsAlgorithmRsa(rsa_algorithm));
+  DCHECK_EQ(EVP_PKEY_RSA, EVP_PKEY_id(key));
+
+  crypto::ScopedRSA rsa(EVP_PKEY_get1_RSA(key));
+  if (!rsa.get())
+    return Status::ErrorUnexpected();
+
+  unsigned int modulus_length_bits = RSA_size(rsa.get()) * 8;

[agl, 2014/07/18 16:55:18]

Since you are reaching in for |e| anyway, you might want
|BN_num_bits(rsa.get()->n))|.

[eroman, 2014/07/18 20:17:31]

Done.

+
+  // Convert the public exponent to big-endian representation.
+  std::vector<uint8> e(BN_num_bytes(rsa.get()->e));
+  if (e.size() == 0)
+    return Status::ErrorUnexpected();
+  if (static_cast<int>(e.size()) != BN_bn2bin(rsa.get()->e, &e[0]))

[agl, 2014/07/18 16:55:18]

cast to int not needed with BoringSSL (which is currently landed).

[eroman, 2014/07/18 20:17:31]

Done.

+    return Status::ErrorUnexpected();
+
+  *key_algorithm = blink::WebCryptoKeyAlgorithm::createRsaHashed(
+      rsa_algorithm, modulus_length_bits, &e[0], e.size(), hash_algorithm);
+
+  return Status::Success();
+}
+
+// Verifies that |key| is consistent with the input algorithm id, and creates a
+// blink::WebCryptoKeyAlgorithm describing the key.
+// Returns Status::Success() on success and sets |*key_algorithm|.
+Status ValidateKeyTypeAndCreateKeyAlgorithm(
+    const blink::WebCryptoAlgorithm& algorithm,
+    EVP_PKEY* key,
+    blink::WebCryptoKeyAlgorithm* key_algorithm) {
+  // TODO(eroman): Validate the algorithm OID against the webcrypto provided
+  // hash. http://crbug.com/389400
+  if (EVP_PKEY_id(key) != EVP_PKEY_RSA)
+    return Status::DataError();  // Data did not define an RSA key.
+  return CreateRsaHashedKeyAlgorithm(algorithm.id(),
+                                     GetInnerHashAlgorithm(algorithm).id(),
+                                     key,
+                                     key_algorithm);
+}
+
+}  // namespace
+
+Status RsaHashedAlgorithm::VerifyKeyUsagesBeforeImportKey(
+    blink::WebCryptoKeyFormat format,
+    blink::WebCryptoKeyUsageMask usage_mask) const {
+  switch (format) {
+    case blink::WebCryptoKeyFormatSpki:
+      return CheckKeyCreationUsages(all_public_key_usages_, usage_mask);
+    case blink::WebCryptoKeyFormatPkcs8:
+      return CheckKeyCreationUsages(all_private_key_usages_, usage_mask);
+    default:
+      return Status::ErrorUnsupportedImportKeyFormat();
+  }
+}
+
+Status RsaHashedAlgorithm::ImportKeyPkcs8(
+    const CryptoData& key_data,
+    const blink::WebCryptoAlgorithm& algorithm,
+    bool extractable,
+    blink::WebCryptoKeyUsageMask usage_mask,
+    blink::WebCryptoKey* key) const {
+  if (!key_data.byte_length())
+    return Status::ErrorImportEmptyKeyData();
+
+  crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
+
+  crypto::ScopedBIO bio(BIO_new_mem_buf(const_cast<uint8*>(key_data.bytes()),
+                                        key_data.byte_length()));
+  if (!bio.get())
+    return Status::ErrorUnexpected();
+
+  crypto::ScopedOpenSSL<PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO_free>::Type
+      p8inf(d2i_PKCS8_PRIV_KEY_INFO_bio(bio.get(), NULL));
+  if (!p8inf.get())
+    return Status::DataError();
+
+  crypto::ScopedEVP_PKEY private_key(EVP_PKCS82PKEY(p8inf.get()));
+  if (!private_key.get())
+    return Status::DataError();
+
+  blink::WebCryptoKeyAlgorithm key_algorithm;
+  Status status = ValidateKeyTypeAndCreateKeyAlgorithm(
+      algorithm, private_key.get(), &key_algorithm);
+  if (status.IsError())
+    return status;
+
+  // TODO(eroman): This is probably going to be the same as the input.
+  std::vector<uint8> pkcs8_data;
+  status = ExportPKeyPkcs8(private_key.get(), &pkcs8_data);
+  if (status.IsError())
+    return status;
+
+  scoped_ptr<AsymKeyOpenSsl> key_handle(
+      new AsymKeyOpenSsl(private_key.Pass(), CryptoData(pkcs8_data)));
+
+  *key = blink::WebCryptoKey::create(key_handle.release(),
+                                     blink::WebCryptoKeyTypePrivate,
+                                     extractable,
+                                     key_algorithm,
+                                     usage_mask);
+  return Status::Success();
+}
+
+Status RsaHashedAlgorithm::ImportKeySpki(
+    const CryptoData& key_data,
+    const blink::WebCryptoAlgorithm& algorithm,
+    bool extractable,
+    blink::WebCryptoKeyUsageMask usage_mask,
+    blink::WebCryptoKey* key) const {
+  if (!key_data.byte_length())
+    return Status::ErrorImportEmptyKeyData();
+
+  crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
+
+  crypto::ScopedBIO bio(BIO_new_mem_buf(const_cast<uint8*>(key_data.bytes()),
+                                        key_data.byte_length()));
+  if (!bio.get())
+    return Status::ErrorUnexpected();
+
+  crypto::ScopedEVP_PKEY public_key(d2i_PUBKEY_bio(bio.get(), NULL));
+  if (!public_key.get())
+    return Status::DataError();
+
+  blink::WebCryptoKeyAlgorithm key_algorithm;
+  Status status = ValidateKeyTypeAndCreateKeyAlgorithm(
+      algorithm, public_key.get(), &key_algorithm);
+  if (status.IsError())
+    return status;
+
+  // TODO(eroman): This is probably going to be the same as the input.
+  std::vector<uint8> spki_data;
+  status = ExportPKeySpki(public_key.get(), &spki_data);
+  if (status.IsError())
+    return status;
+
+  scoped_ptr<AsymKeyOpenSsl> key_handle(
+      new AsymKeyOpenSsl(public_key.Pass(), CryptoData(spki_data)));
+
+  *key = blink::WebCryptoKey::create(key_handle.release(),
+                                     blink::WebCryptoKeyTypePublic,
+                                     extractable,
+                                     key_algorithm,
+                                     usage_mask);
+  return Status::Success();
+}
+
+Status RsaHashedAlgorithm::ExportKeyPkcs8(const blink::WebCryptoKey& key,
+                                          std::vector<uint8>* buffer) const {
+  if (key.type() != blink::WebCryptoKeyTypePrivate)
+    return Status::ErrorUnexpectedKeyType();
+  *buffer = AsymKeyOpenSsl::Cast(key)->serialized_key_data();
+  return Status::Success();
+}
+
+Status RsaHashedAlgorithm::ExportKeySpki(const blink::WebCryptoKey& key,
+                                         std::vector<uint8>* buffer) const {
+  if (key.type() != blink::WebCryptoKeyTypePublic)
+    return Status::ErrorUnexpectedKeyType();
+  *buffer = AsymKeyOpenSsl::Cast(key)->serialized_key_data();
+  return Status::Success();
+}
+
+}  // namespace webcrypto
+
+}  // namespace content