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

crypto/ec_signature_creator_impl.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/ec_signature_creator_impl.h"
 
 #include <openssl/bn.h>
 #include <openssl/ec.h>
 #include <openssl/ecdsa.h>
 #include <openssl/evp.h>
@@ skipping 15 matching lines @@
 
 ECSignatureCreatorImpl::~ECSignatureCreatorImpl() {}
 
 bool ECSignatureCreatorImpl::Sign(const uint8_t* data,
                                   int data_len,
                                   std::vector<uint8_t>* signature) {
   OpenSSLErrStackTracer err_tracer(FROM_HERE);
   ScopedEVP_MD_CTX ctx(EVP_MD_CTX_create());
   size_t sig_len = 0;
   if (!ctx.get() ||
-      !EVP_DigestSignInit(ctx.get(), NULL, EVP_sha256(), NULL, key_->key()) ||
+      !EVP_DigestSignInit(ctx.get(), nullptr, EVP_sha256(), nullptr,
+                          key_->key()) ||
       !EVP_DigestSignUpdate(ctx.get(), data, data_len) ||
-      !EVP_DigestSignFinal(ctx.get(), NULL, &sig_len)) {
+      !EVP_DigestSignFinal(ctx.get(), nullptr, &sig_len)) {
     return false;
   }
 
   signature->resize(sig_len);
   if (!EVP_DigestSignFinal(ctx.get(), &signature->front(), &sig_len))
     return false;
 
-  // NOTE: A call to EVP_DigestSignFinal() with a NULL second parameter returns
-  // a maximum allocation size, while the call without a NULL returns the real
-  // one, which may be smaller.
+  // NOTE: A call to EVP_DigestSignFinal() with a nullptr second parameter
+  // returns a maximum allocation size, while the call without a nullptr
+  // returns the real one, which may be smaller.
   signature->resize(sig_len);
   return true;
 }
 
 bool ECSignatureCreatorImpl::DecodeSignature(
     const std::vector<uint8_t>& der_sig,
     std::vector<uint8_t>* out_raw_sig) {
   OpenSSLErrStackTracer err_tracer(FROM_HERE);
   // Create ECDSA_SIG object from DER-encoded data.
   ScopedECDSA_SIG ecdsa_sig(
       ECDSA_SIG_from_bytes(der_sig.data(), der_sig.size()));
   if (!ecdsa_sig.get())
     return false;
 
   // The result is made of two 32-byte vectors.
   const size_t kMaxBytesPerBN = 32;
   std::vector<uint8_t> result(2 * kMaxBytesPerBN);
 
   if (!BN_bn2bin_padded(&result[0], kMaxBytesPerBN, ecdsa_sig->r) ||
       !BN_bn2bin_padded(&result[kMaxBytesPerBN], kMaxBytesPerBN,
                         ecdsa_sig->s)) {
     return false;
   }
   out_raw_sig->swap(result);
   return true;
 }
 
 }  // namespace crypto