Make //crypto factories return std::unique_ptr<>s

crypto/signature_creator.cc

 // Copyright (c) 2012 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/signature_creator.h"
 
 #include <openssl/evp.h>
 #include <openssl/rsa.h>
 #include <stddef.h>
 #include <stdint.h>
 
-#include <memory>
-
 #include "base/logging.h"
 #include "crypto/openssl_util.h"
 #include "crypto/rsa_private_key.h"
 #include "crypto/scoped_openssl_types.h"
 
 namespace crypto {
 
 namespace {
 
 const EVP_MD* ToOpenSSLDigest(SignatureCreator::HashAlgorithm hash_alg) {
   switch (hash_alg) {
     case SignatureCreator::SHA1:
       return EVP_sha1();
     case SignatureCreator::SHA256:
       return EVP_sha256();
   }
-  return NULL;
+  return nullptr;
 }
 
 int ToOpenSSLDigestType(SignatureCreator::HashAlgorithm hash_alg) {
   switch (hash_alg) {
     case SignatureCreator::SHA1:
       return NID_sha1;
     case SignatureCreator::SHA256:
       return NID_sha256;
   }
   return NID_undef;
 }
 
 }  // namespace
 
+SignatureCreator::~SignatureCreator() {
+  EVP_MD_CTX_destroy(sign_context_);
+}
+
 // static
-SignatureCreator* SignatureCreator::Create(RSAPrivateKey* key,
-                                           HashAlgorithm hash_alg) {
+std::unique_ptr<SignatureCreator> SignatureCreator::Create(
+    RSAPrivateKey* key,
+    HashAlgorithm hash_alg) {
   OpenSSLErrStackTracer err_tracer(FROM_HERE);
   std::unique_ptr<SignatureCreator> result(new SignatureCreator);
   const EVP_MD* const digest = ToOpenSSLDigest(hash_alg);
   DCHECK(digest);
   if (!digest) {
-    return NULL;
+    return nullptr;
   }
-  if (!EVP_DigestSignInit(result->sign_context_, NULL, digest, NULL,
+  if (!EVP_DigestSignInit(result->sign_context_, nullptr, digest, nullptr,
                           key->key())) {
-    return NULL;
+    return nullptr;
   }
-  return result.release();
+  return result;
 }
 
 // static
 bool SignatureCreator::Sign(RSAPrivateKey* key,
                             HashAlgorithm hash_alg,
                             const uint8_t* data,
                             int data_len,
                             std::vector<uint8_t>* signature) {
   ScopedRSA rsa_key(EVP_PKEY_get1_RSA(key->key()));
   if (!rsa_key)
     return false;
   signature->resize(RSA_size(rsa_key.get()));
 
   unsigned int len = 0;
   if (!RSA_sign(ToOpenSSLDigestType(hash_alg), data, data_len,
                 signature->data(), &len, rsa_key.get())) {
     signature->clear();
     return false;
   }
   signature->resize(len);
   return true;
 }
 
-SignatureCreator::SignatureCreator()
-    : sign_context_(EVP_MD_CTX_create()) {
-}
-
-SignatureCreator::~SignatureCreator() {
-  EVP_MD_CTX_destroy(sign_context_);
-}
-
 bool SignatureCreator::Update(const uint8_t* data_part, int data_part_len) {
   OpenSSLErrStackTracer err_tracer(FROM_HERE);
   return !!EVP_DigestSignUpdate(sign_context_, data_part, data_part_len);
 }
 
 bool SignatureCreator::Final(std::vector<uint8_t>* signature) {
   OpenSSLErrStackTracer err_tracer(FROM_HERE);
 
   // Determine the maximum length of the signature.
   size_t len = 0;
-  if (!EVP_DigestSignFinal(sign_context_, NULL, &len)) {
+  if (!EVP_DigestSignFinal(sign_context_, nullptr, &len)) {
     signature->clear();
     return false;
   }
   signature->resize(len);
 
   // Sign it.
   if (!EVP_DigestSignFinal(sign_context_, signature->data(), &len)) {
     signature->clear();
     return false;
   }
   signature->resize(len);
   return true;
 }
 
+SignatureCreator::SignatureCreator() : sign_context_(EVP_MD_CTX_create()) {}
+
 }  // namespace crypto