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

crypto/hmac.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/hmac.h"
 
 #include <openssl/hmac.h>
 #include <stddef.h>
 
 #include <algorithm>
@@ skipping 45 matching lines @@
   std::fill(raw_key.begin(), raw_key.end(), 0);
   return result;
 }
 
 bool HMAC::Sign(const base::StringPiece& data,
                 unsigned char* digest,
                 size_t digest_length) const {
   DCHECK(initialized_);
 
   ScopedOpenSSLSafeSizeBuffer<EVP_MAX_MD_SIZE> result(digest, digest_length);
-  return !!::HMAC(hash_alg_ == SHA1 ? EVP_sha1() : EVP_sha256(),
-                  key_.data(), key_.size(),
+  return !!::HMAC(hash_alg_ == SHA1 ? EVP_sha1() : EVP_sha256(), key_.data(),
+                  key_.size(),
                   reinterpret_cast<const unsigned char*>(data.data()),
-                  data.size(), result.safe_buffer(), NULL);
+                  data.size(), result.safe_buffer(), nullptr);
 }
 
 bool HMAC::Verify(const base::StringPiece& data,
                   const base::StringPiece& digest) const {
   if (digest.size() != DigestLength())
     return false;
   return VerifyTruncated(data, digest);
 }
 
 bool HMAC::VerifyTruncated(const base::StringPiece& data,
                            const base::StringPiece& digest) const {
   if (digest.empty())
     return false;
   size_t digest_length = DigestLength();
   std::unique_ptr<unsigned char[]> computed_digest(
       new unsigned char[digest_length]);
   if (!Sign(data, computed_digest.get(), digest_length))
     return false;
 
   return SecureMemEqual(digest.data(), computed_digest.get(),
                         std::min(digest.size(), digest_length));
 }
 
 }  // namespace crypto