Use std::unique_ptr for MessageDigest

src/DHTTokenTracker.cc

@@ -76,7 +76,7 @@ std::string DHTTokenTracker::generateToken
   memcpy(src, infoHash, DHT_ID_LENGTH);
   memcpy(src+DHT_ID_LENGTH+COMPACT_LEN_IPV6, secret, SECRET_SIZE);
   unsigned char md[20];
-  message_digest::digest(md, sizeof(md), MessageDigest::sha1(),
+  message_digest::digest(md, sizeof(md), MessageDigest::sha1().get(),
                          src, sizeof(src));
   return std::string(&md[0], &md[sizeof(md)]);
 }

src/DownloadCommand.h

@@ -57,7 +57,7 @@ private:
 
 #ifdef ENABLE_MESSAGE_DIGEST
 
-  std::shared_ptr<MessageDigest> messageDigest_;
+  std::unique_ptr<MessageDigest> messageDigest_;
 
 #endif // ENABLE_MESSAGE_DIGEST
 

src/HttpServerCommand.cc

@@ -130,7 +130,7 @@ std::string createWebSocketServerKey(const std::string& clientKey)
   std::string src = clientKey;
   src += "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
   unsigned char digest[20];
-  message_digest::digest(digest, sizeof(digest), MessageDigest::sha1(),
+  message_digest::digest(digest, sizeof(digest), MessageDigest::sha1().get(),
                          src.c_str(), src.size());
   return base64::encode(&digest[0], &digest[sizeof(digest)]);
 }

src/IteratableChecksumValidator.h

@@ -54,7 +54,7 @@ private:
 
   int64_t currentOffset_;
 
-  std::shared_ptr<MessageDigest> ctx_;
+  std::unique_ptr<MessageDigest> ctx_;
 public:
   IteratableChecksumValidator(const std::shared_ptr<DownloadContext>& dctx,
                               const std::shared_ptr<PieceStorage>& pieceStorage);

src/IteratableChunkChecksumValidator.h

@@ -54,7 +54,7 @@ private:
   std::shared_ptr<PieceStorage> pieceStorage_;
   std::shared_ptr<BitfieldMan> bitfield_;
   size_t currentIndex_;
-  std::shared_ptr<MessageDigest> ctx_;
+  std::unique_ptr<MessageDigest> ctx_;
 
   std::string calculateActualChecksum();
 

src/LibgcryptMessageDigestImpl.cc

@@ -38,10 +38,11 @@
 
 #include "array_fun.h"
 #include "HashFuncEntry.h"
+#include "a2functional.h"
 
 namespace aria2 {
 
-MessageDigestImpl::MessageDigestImpl(int hashFunc):hashFunc_(hashFunc)
+MessageDigestImpl::MessageDigestImpl(int hashFunc) : hashFunc_{hashFunc}
 {
   gcry_md_open(&ctx_, hashFunc_, 0);
 }
@@ -51,9 +52,9 @@ MessageDigestImpl::~MessageDigestImpl()
   gcry_md_close(ctx_);
 }
 
-std::shared_ptr<MessageDigestImpl> MessageDigestImpl::sha1()
+std::unique_ptr<MessageDigestImpl> MessageDigestImpl::sha1()
 {
-  return std::shared_ptr<MessageDigestImpl>(new MessageDigestImpl(GCRY_MD_SHA1));
+  return make_unique<MessageDigestImpl>(GCRY_MD_SHA1);
 }
 
 typedef HashFuncEntry<int> CHashFuncEntry;
@@ -70,12 +71,12 @@ CHashFuncEntry hashFuncs[] = {
 };
 } // namespace
 
-std::shared_ptr<MessageDigestImpl> MessageDigestImpl::create
+std::unique_ptr<MessageDigestImpl> MessageDigestImpl::create
 (const std::string& hashType)
 {
   int hashFunc = getHashFunc(std::begin(hashFuncs), std::end(hashFuncs),
                              hashType);
-  return std::shared_ptr<MessageDigestImpl>(new MessageDigestImpl(hashFunc));
+  return make_unique<MessageDigestImpl>(hashFunc);
 }
 
 bool MessageDigestImpl::supports(const std::string& hashType)

src/LibgcryptMessageDigestImpl.h

@@ -45,20 +45,18 @@
 namespace aria2 {
 
 class MessageDigestImpl {
-private:
-  int hashFunc_;
-  gcry_md_hd_t ctx_;
-
+public:
   MessageDigestImpl(int hashFunc);
   // We don't implement copy ctor.
-  MessageDigestImpl(const MessageDigestImpl&);
+  MessageDigestImpl(const MessageDigestImpl&) = delete;
   // We don't implement assignment operator.
-  MessageDigestImpl& operator==(const MessageDigestImpl&);
-public:
+  MessageDigestImpl& operator==(const MessageDigestImpl&) = delete;
+
   ~MessageDigestImpl();
 
-  static std::shared_ptr<MessageDigestImpl> sha1();
-  static std::shared_ptr<MessageDigestImpl> create(const std::string& hashType);
+  static std::unique_ptr<MessageDigestImpl> sha1();
+  static std::unique_ptr<MessageDigestImpl> create
+  (const std::string& hashType);
 
   static bool supports(const std::string& hashType);
   static size_t getDigestLength(const std::string& hashType);
@@ -67,6 +65,9 @@ public:
   void reset();
   void update(const void* data, size_t length);
   void digest(unsigned char* md);
+private:
+  int hashFunc_;
+  gcry_md_hd_t ctx_;
 };
 
 } // namespace aria2

src/LibnettleMessageDigestImpl.cc

@@ -38,12 +38,13 @@
 
 #include "array_fun.h"
 #include "HashFuncEntry.h"
+#include "a2functional.h"
 
 namespace aria2 {
 
 MessageDigestImpl::MessageDigestImpl(const nettle_hash* hashInfo)
-  : hashInfo_(hashInfo),
-    ctx_(new char[hashInfo->context_size])
+  : hashInfo_{hashInfo},
+    ctx_{new char[hashInfo->context_size]}
 {
   reset();
 }
@@ -53,9 +54,9 @@ MessageDigestImpl::~MessageDigestImpl()
   delete [] ctx_;
 }
 
-std::shared_ptr<MessageDigestImpl> MessageDigestImpl::sha1()
+std::unique_ptr<MessageDigestImpl> MessageDigestImpl::sha1()
 {
-  return std::shared_ptr<MessageDigestImpl>(new MessageDigestImpl(&nettle_sha1));
+  return make_unique<MessageDigestImpl>(&nettle_sha1);
 }
 
 typedef HashFuncEntry<const nettle_hash*> CHashFuncEntry;
@@ -72,12 +73,12 @@ CHashFuncEntry hashFuncs[] = {
 };
 } // namespace
 
-std::shared_ptr<MessageDigestImpl> MessageDigestImpl::create
+std::unique_ptr<MessageDigestImpl> MessageDigestImpl::create
 (const std::string& hashType)
 {
-  const nettle_hash* hashInfo =
+  auto hashInfo =
     getHashFunc(std::begin(hashFuncs), std::end(hashFuncs), hashType);
-  return std::shared_ptr<MessageDigestImpl>(new MessageDigestImpl(hashInfo));
+  return make_unique<MessageDigestImpl>(hashInfo);
 }
 
 bool MessageDigestImpl::supports(const std::string& hashType)
@@ -89,7 +90,7 @@ bool MessageDigestImpl::supports(const std::string& hashType)
 
 size_t MessageDigestImpl::getDigestLength(const std::string& hashType)
 {
-  const nettle_hash* hashInfo =
+  auto hashInfo =
     getHashFunc(std::begin(hashFuncs), std::end(hashFuncs), hashType);
   return hashInfo->digest_size;
 }

src/LibnettleMessageDigestImpl.h

@@ -45,20 +45,18 @@
 namespace aria2 {
 
 class MessageDigestImpl {
-private:
-  const nettle_hash* hashInfo_;
-  char* ctx_;
-
+public:
   MessageDigestImpl(const nettle_hash* hashInfo);
   // We don't implement copy ctor.
-  MessageDigestImpl(const MessageDigestImpl&);
+  MessageDigestImpl(const MessageDigestImpl&) = delete;
   // We don't implement assignment operator.
-  MessageDigestImpl& operator==(const MessageDigestImpl&);
-public:
+  MessageDigestImpl& operator==(const MessageDigestImpl&) = delete;
+
   ~MessageDigestImpl();
 
-  static std::shared_ptr<MessageDigestImpl> sha1();
-  static std::shared_ptr<MessageDigestImpl> create(const std::string& hashType);
+  static std::unique_ptr<MessageDigestImpl> sha1();
+  static std::unique_ptr<MessageDigestImpl> create
+  (const std::string& hashType);
 
   static bool supports(const std::string& hashType);
   static size_t getDigestLength(const std::string& hashType);
@@ -67,6 +65,9 @@ public:
   void reset();
   void update(const void* data, size_t length);
   void digest(unsigned char* md);
+private:
+  const nettle_hash* hashInfo_;
+  char* ctx_;
 };
 
 } // namespace aria2

src/LibsslMessageDigestImpl.cc

@@ -38,10 +38,12 @@
 
 #include "array_fun.h"
 #include "HashFuncEntry.h"
+#include "a2functional.h"
 
 namespace aria2 {
 
-MessageDigestImpl::MessageDigestImpl(const EVP_MD* hashFunc):hashFunc_(hashFunc)
+MessageDigestImpl::MessageDigestImpl(const EVP_MD* hashFunc)
+  : hashFunc_{hashFunc}
 {
   EVP_MD_CTX_init(&ctx_);
   reset();
@@ -52,9 +54,9 @@ MessageDigestImpl::~MessageDigestImpl()
   EVP_MD_CTX_cleanup(&ctx_);
 }
 
-std::shared_ptr<MessageDigestImpl> MessageDigestImpl::sha1()
+std::unique_ptr<MessageDigestImpl> MessageDigestImpl::sha1()
 {
-  return std::shared_ptr<MessageDigestImpl>(new MessageDigestImpl(EVP_sha1()));
+  return make_unique<MessageDigestImpl>(EVP_sha1());
 }
 
 typedef HashFuncEntry<const EVP_MD*> CHashFuncEntry;
@@ -79,13 +81,12 @@ CHashFuncEntry hashFuncs[] = {
 };
 } // namespace
 
-std::shared_ptr<MessageDigestImpl> MessageDigestImpl::create
+std::unique_ptr<MessageDigestImpl> MessageDigestImpl::create
 (const std::string& hashType)
 {
-  const EVP_MD* hashFunc = getHashFunc(std::begin(hashFuncs),
-                                       std::end(hashFuncs),
-                                       hashType);
-  return std::shared_ptr<MessageDigestImpl>(new MessageDigestImpl(hashFunc));
+  auto hashFunc = getHashFunc(std::begin(hashFuncs), std::end(hashFuncs),
+                              hashType);
+  return make_unique<MessageDigestImpl>(hashFunc);
 }
 
 bool MessageDigestImpl::supports(const std::string& hashType)
@@ -97,9 +98,8 @@ bool MessageDigestImpl::supports(const std::string& hashType)
 
 size_t MessageDigestImpl::getDigestLength(const std::string& hashType)
 {
-  const EVP_MD* hashFunc = getHashFunc(std::begin(hashFuncs),
-                                       std::end(hashFuncs),
-                                       hashType);
+  auto hashFunc = getHashFunc(std::begin(hashFuncs), std::end(hashFuncs),
+                              hashType);
   return EVP_MD_size(hashFunc);
 }
 

src/LibsslMessageDigestImpl.h

@@ -45,20 +45,18 @@
 namespace aria2 {
 
 class MessageDigestImpl {
-private:
-  const EVP_MD* hashFunc_;
-  EVP_MD_CTX ctx_;
-
+public:
   MessageDigestImpl(const EVP_MD* hashFunc);
   // We don't implement copy ctor.
-  MessageDigestImpl(const MessageDigestImpl&);
+  MessageDigestImpl(const MessageDigestImpl&) = delete;
   // We don't implement assignment operator.
-  MessageDigestImpl& operator==(const MessageDigestImpl&);
-public:
+  MessageDigestImpl& operator==(const MessageDigestImpl&) = delete;
+
   ~MessageDigestImpl();
 
-  static std::shared_ptr<MessageDigestImpl> sha1();
-  static std::shared_ptr<MessageDigestImpl> create(const std::string& hashType);
+  static std::unique_ptr<MessageDigestImpl> sha1();
+  static std::unique_ptr<MessageDigestImpl> create
+  (const std::string& hashType);
 
   static bool supports(const std::string& hashType);
   static size_t getDigestLength(const std::string& hashType);
@@ -67,6 +65,9 @@ public:
   void reset();
   void update(const void* data, size_t length);
   void digest(unsigned char* md);
+private:
+  const EVP_MD* hashFunc_;
+  EVP_MD_CTX ctx_;
 };
 
 } // namespace aria2

src/MSEHandshake.cc

@@ -194,7 +194,7 @@ void MSEHandshake::initCipher(const unsigned char* infoHash)
   unsigned char localCipherKey[20];
   sha1_->reset();
   message_digest::digest(localCipherKey, sizeof(localCipherKey),
-                         sha1_, s, sizeof(s));
+                         sha1_.get(), s, sizeof(s));
   encryptor_.reset(new ARC4Encryptor());
   encryptor_->init(localCipherKey, sizeof(localCipherKey));
 
@@ -202,7 +202,7 @@ void MSEHandshake::initCipher(const unsigned char* infoHash)
   memcpy(s, initiator_?"keyB":"keyA", 4);
   sha1_->reset();
   message_digest::digest(peerCipherKey, sizeof(peerCipherKey),
-                         sha1_, s, sizeof(s));
+                         sha1_.get(), s, sizeof(s));
   decryptor_.reset(new ARC4Encryptor());
   decryptor_->init(peerCipherKey, sizeof(peerCipherKey));
 
@@ -234,7 +234,7 @@ void MSEHandshake::createReq1Hash(unsigned char* md) const
   memcpy(buffer, "req1", 4);
   memcpy(buffer+4, secret_, KEY_LENGTH);
   sha1_->reset();
-  message_digest::digest(md, 20, sha1_, buffer, 4+KEY_LENGTH);
+  message_digest::digest(md, 20, sha1_.get(), buffer, 4+KEY_LENGTH);
 }
 
 void MSEHandshake::createReq23Hash(unsigned char* md, const unsigned char* infoHash) const
@@ -244,14 +244,14 @@ void MSEHandshake::createReq23Hash(unsigned char* md, const unsigned char* infoH
   memcpy(x+4, infoHash, INFO_HASH_LENGTH);
   unsigned char xh[20];
   sha1_->reset();
-  message_digest::digest(xh, sizeof(xh), sha1_, x, sizeof(x));
+  message_digest::digest(xh, sizeof(xh), sha1_.get(), x, sizeof(x));
 
   unsigned char y[4+96];
   memcpy(y, "req3", 4);
   memcpy(y+4, secret_, KEY_LENGTH);
   unsigned char yh[20];
   sha1_->reset();
-  message_digest::digest(yh, sizeof(yh), sha1_, y, sizeof(y));
+  message_digest::digest(yh, sizeof(yh), sha1_.get(), y, sizeof(y));
 
   for(size_t i = 0; i < 20; ++i) {
     md[i] = xh[i]^yh[i];

src/MSEHandshake.h

@@ -98,7 +98,7 @@ private:
   uint16_t padLength_;
   uint16_t iaLength_;
   unsigned char* ia_;
-  std::shared_ptr<MessageDigest> sha1_;
+  std::unique_ptr<MessageDigest> sha1_;
 
   void encryptAndSendData(unsigned char* data, size_t length);
 

src/MessageDigest.cc

@@ -63,24 +63,21 @@ HashTypeEntry hashTypes[] = {
 };
 } // namespace aria2
 
-MessageDigest::MessageDigest()
+MessageDigest::MessageDigest(std::unique_ptr<MessageDigestImpl> impl)
+  : pImpl_{std::move(impl)}
 {}
 
-MessageDigest::~MessageDigest()
-{}
+MessageDigest::~MessageDigest() {}
 
-std::shared_ptr<MessageDigest> MessageDigest::sha1()
+std::unique_ptr<MessageDigest> MessageDigest::sha1()
 {
-  std::shared_ptr<MessageDigest> md(new MessageDigest());
-  md->pImpl_ = MessageDigestImpl::sha1();
-  return md;
+  return make_unique<MessageDigest>(MessageDigestImpl::sha1());
 }
 
-std::shared_ptr<MessageDigest> MessageDigest::create(const std::string& hashType)
+std::unique_ptr<MessageDigest> MessageDigest::create
+(const std::string& hashType)
 {
-  std::shared_ptr<MessageDigest> md(new MessageDigest());
-  md->pImpl_ = MessageDigestImpl::create(hashType);
-  return md;
+  return make_unique<MessageDigest>(MessageDigestImpl::create(hashType));
 }
 
 bool MessageDigest::supports(const std::string& hashType)
@@ -101,10 +98,11 @@ std::vector<std::string> MessageDigest::getSupportedHashTypes()
 
 std::string MessageDigest::getSupportedHashTypeString()
 {
-  std::vector<std::string> ht = getSupportedHashTypes();
+  auto ht = getSupportedHashTypes();
   std::stringstream ss;
-  std::copy(ht.begin(), ht.end(), std::ostream_iterator<std::string>(ss, ", "));
-  std::string res = ss.str();
+  std::copy(std::begin(ht), std::end(ht),
+            std::ostream_iterator<std::string>(ss, ", "));
+  auto res = ss.str();
   if(!res.empty()) {
     res.erase(ss.str().length()-2);
   }
@@ -133,12 +131,10 @@ public:
 
 bool MessageDigest::isStronger(const std::string& lhs, const std::string& rhs)
 {
-  HashTypeEntry* lEntry = std::find_if(std::begin(hashTypes),
-                                       std::end(hashTypes),
-                                       FindHashTypeEntry(lhs));
-  HashTypeEntry* rEntry = std::find_if(std::begin(hashTypes),
-                                       std::end(hashTypes),
-                                       FindHashTypeEntry(rhs));
+  auto lEntry = std::find_if(std::begin(hashTypes), std::end(hashTypes),
+                             FindHashTypeEntry(lhs));
+  auto rEntry = std::find_if(std::begin(hashTypes), std::end(hashTypes),
+                             FindHashTypeEntry(rhs));
   if(lEntry == std::end(hashTypes) || rEntry == std::end(hashTypes)) {
     return false;
   }

src/MessageDigest.h

@@ -46,24 +46,22 @@ namespace aria2 {
 class MessageDigestImpl;
 
 class MessageDigest {
-private:
-  std::shared_ptr<MessageDigestImpl> pImpl_;
-
-  MessageDigest();
-
+public:
+  // Made public for make_unique
+  MessageDigest(std::unique_ptr<MessageDigestImpl> impl);
   // We don't implement copy ctor.
-  MessageDigest(const MessageDigest&);
+  MessageDigest(const MessageDigest&) = delete;
   // We don't implement assignment operator.
-  MessageDigest& operator=(const MessageDigest&);
-public:
+  MessageDigest& operator=(const MessageDigest&) = delete;
+
   ~MessageDigest();
 
   // Factory functions
-  static std::shared_ptr<MessageDigest> sha1();
+  static std::unique_ptr<MessageDigest> sha1();
 
   // Factory function which takes hashType as string.  Throws
   // exception if hashType is not supported.
-  static std::shared_ptr<MessageDigest> create(const std::string& hashType);
+  static std::unique_ptr<MessageDigest> create(const std::string& hashType);
 
   // Returns true if hashType is supported. Otherwise returns false.
   static bool supports(const std::string& hashType);
@@ -107,6 +105,8 @@ public:
   // Returns raw digest, not hex digest.  This call can only be called
   // once. To reuse this object, call reset().
   std::string digest();
+private:
+  std::unique_ptr<MessageDigestImpl> pImpl_;
 };
 
 } // namespace aria2

src/Piece.cc

@@ -245,7 +245,7 @@ std::string Piece::getDigest()
 }
 
 namespace {
-void updateHashWithRead(const std::shared_ptr<MessageDigest>& mdctx,
+void updateHashWithRead(MessageDigest* mdctx,
                         const std::shared_ptr<DiskAdaptor>& adaptor,
                         int64_t offset, size_t len)
 {
@@ -274,7 +274,7 @@ void updateHashWithRead(const std::shared_ptr<MessageDigest>& mdctx,
 std::string Piece::getDigestWithWrCache
 (size_t pieceLength, const std::shared_ptr<DiskAdaptor>& adaptor)
 {
-  std::shared_ptr<MessageDigest> mdctx(MessageDigest::create(hashType_));
+  auto mdctx = MessageDigest::create(hashType_);
   int64_t start = static_cast<int64_t>(index_)*pieceLength;
   int64_t goff = start;
   if(wrCache_) {
@@ -282,14 +282,14 @@ std::string Piece::getDigestWithWrCache
     for(WrDiskCacheEntry::DataCellSet::iterator i = dataSet.begin(),
           eoi = dataSet.end(); i != eoi; ++i) {
       if(goff < (*i)->goff) {
-        updateHashWithRead(mdctx, adaptor, goff, (*i)->goff - goff);
+        updateHashWithRead(mdctx.get(), adaptor, goff, (*i)->goff - goff);
       }
       mdctx->update((*i)->data+(*i)->offset, (*i)->len);
       goff = (*i)->goff + (*i)->len;
     }
-    updateHashWithRead(mdctx, adaptor, goff, start+length_-goff);
+    updateHashWithRead(mdctx.get(), adaptor, goff, start+length_-goff);
   } else {
-    updateHashWithRead(mdctx, adaptor, goff, length_);
+    updateHashWithRead(mdctx.get(), adaptor, goff, length_);
   }
   return mdctx->digest();
 }

src/Piece.h

@@ -72,7 +72,7 @@ private:
 
   std::string hashType_;
 
-  std::shared_ptr<MessageDigest> mdctx_;
+  std::unique_ptr<MessageDigest> mdctx_;
 
 #endif // ENABLE_MESSAGE_DIGEST
 

src/RpcMethodImpl.cc

@@ -252,7 +252,7 @@ namespace {
 std::string getHexSha1(const std::string& s)
 {
   unsigned char hash[20];
-  message_digest::digest(hash, sizeof(hash), MessageDigest::sha1(),
+  message_digest::digest(hash, sizeof(hash), MessageDigest::sha1().get(),
                          s.data(), s.size());
   return util::toHex(hash, sizeof(hash));
 }

src/UTMetadataDataExtensionMessage.cc

@@ -90,7 +90,7 @@ void UTMetadataDataExtensionMessage::doReceivedAction()
       std::string metadata = util::toString(pieceStorage_->getDiskAdaptor());
       unsigned char infoHash[INFO_HASH_LENGTH];
       message_digest::digest(infoHash, INFO_HASH_LENGTH,
-                             MessageDigest::sha1(),
+                             MessageDigest::sha1().get(),
                              metadata.data(), metadata.size());
       if(memcmp(infoHash, bittorrent::getInfoHash(dctx_),
                 INFO_HASH_LENGTH) == 0) {

src/bittorrent_helper.cc

@@ -428,7 +428,7 @@ void processRootDictionary
   std::string encodedInfoDict = bencode2::encode(infoDict);
   unsigned char infoHash[INFO_HASH_LENGTH];
   message_digest::digest(infoHash, INFO_HASH_LENGTH,
-                         MessageDigest::sha1(),
+                         MessageDigest::sha1().get(),
                          encodedInfoDict.data(),
                          encodedInfoDict.size());
   torrent->infoHash.assign(&infoHash[0], &infoHash[INFO_HASH_LENGTH]);
@@ -675,8 +675,8 @@ void computeFastSet
   }
   memcpy(tx+4, infoHash, 20);
   unsigned char x[20];
-  std::shared_ptr<MessageDigest> sha1 = MessageDigest::sha1();
-  message_digest::digest(x, sizeof(x), sha1, tx, 24);
+  auto sha1 = MessageDigest::sha1();
+  message_digest::digest(x, sizeof(x), sha1.get(), tx, 24);
   while(fastSet.size() < fastSetSize) {
     for(size_t i = 0; i < 5 && fastSet.size() < fastSetSize; ++i) {
       size_t j = i*4;
@@ -690,7 +690,7 @@ void computeFastSet
     }
     unsigned char temp[20];
     sha1->reset();
-    message_digest::digest(temp, sizeof(temp), sha1, x, sizeof(x));
+    message_digest::digest(temp, sizeof(temp), sha1.get(), x, sizeof(x));
     memcpy(x, temp, sizeof(x));
   }
 }

src/message_digest_helper.cc

@@ -49,7 +49,7 @@ namespace aria2 {
 namespace message_digest {
 
 std::string digest
-(const std::shared_ptr<MessageDigest>& ctx,
+(MessageDigest* ctx,
  const std::shared_ptr<BinaryStream>& bs,
  int64_t offset, int64_t length)
 {
@@ -78,7 +78,7 @@ std::string digest
 
 void digest
 (unsigned char* md, size_t mdLength,
- const std::shared_ptr<MessageDigest>& ctx, const void* data, size_t length)
+ MessageDigest* ctx, const void* data, size_t length)
 {
   size_t reqLength = ctx->getDigestLength();
   if(mdLength < reqLength) {

src/message_digest_helper.h

@@ -52,7 +52,7 @@ namespace message_digest {
  * Returns raw digest string, not hex digest
  */
 std::string digest
-(const std::shared_ptr<MessageDigest>& ctx,
+(MessageDigest* ctx,
  const std::shared_ptr<BinaryStream>& bs,
  int64_t offset, int64_t length);
 
@@ -62,7 +62,7 @@ std::string digest
  */
 void digest
 (unsigned char* md, size_t mdLength,
- const std::shared_ptr<MessageDigest>& ctx,
+ MessageDigest* ctx,
  const void* data, size_t length);
 
 } // namespace message_digest

src/util.cc

@@ -1602,7 +1602,8 @@ void generateRandomKey(unsigned char* key)
 #ifdef ENABLE_MESSAGE_DIGEST
   unsigned char bytes[40];
   generateRandomData(bytes, sizeof(bytes));
-  message_digest::digest(key, 20, MessageDigest::sha1(), bytes, sizeof(bytes));
+  message_digest::digest(key, 20, MessageDigest::sha1().get(), bytes,
+                         sizeof(bytes));
 #else // !ENABLE_MESSAGE_DIGEST
   generateRandomData(key, 20);
 #endif // !ENABLE_MESSAGE_DIGEST

test/GZipDecoderTest.cc

@@ -55,7 +55,7 @@ void GZipDecoderTest::testDecode()
 
 #ifdef ENABLE_MESSAGE_DIGEST
   CPPUNIT_ASSERT_EQUAL(std::string("8b577b33c0411b2be9d4fa74c7402d54a8d21f96"),
-                       fileHexDigest(MessageDigest::sha1(), outfile));
+                       fileHexDigest(MessageDigest::sha1().get(), outfile));
 #endif // ENABLE_MESSAGE_DIGEST
 }
 

test/MessageDigestHelperTest.cc

@@ -26,17 +26,19 @@ public:
 CPPUNIT_TEST_SUITE_REGISTRATION( MessageDigestHelperTest );
 
 void MessageDigestHelperTest::testDigestDiskWriter() {
-  std::shared_ptr<DefaultDiskWriter> diskio
-    (new DefaultDiskWriter(A2_TEST_DIR"/4096chunk.txt"));
+  auto diskio = std::make_shared<DefaultDiskWriter>
+    (A2_TEST_DIR"/4096chunk.txt");
   diskio->enableReadOnly();
   diskio->openExistingFile();
   CPPUNIT_ASSERT_EQUAL(std::string("608cabc0f2fa18c260cafd974516865c772363d5"),
                        util::toHex(message_digest::digest
-                                   (MessageDigest::sha1(), diskio, 0, 4096)));
+                                   (MessageDigest::sha1().get(),
+                                    diskio, 0, 4096)));
 
   CPPUNIT_ASSERT_EQUAL(std::string("7a4a9ae537ebbbb826b1060e704490ad0f365ead"),
                        util::toHex(message_digest::digest
-                                   (MessageDigest::sha1(), diskio, 5, 100)));
+                                   (MessageDigest::sha1().get(),
+                                    diskio, 5, 100)));
 }
 
 } // namespace aria2

test/MessageDigestTest.cc

@@ -17,7 +17,7 @@ class MessageDigestTest:public CppUnit::TestFixture {
   CPPUNIT_TEST(testGetCanonicalHashType);
   CPPUNIT_TEST_SUITE_END();
 
-  std::shared_ptr<MessageDigest> sha1_;
+  std::unique_ptr<MessageDigest> sha1_;
 public:
   void setUp()
   {

test/TestUtil.cc

@@ -81,8 +81,7 @@ std::string fromHex(const std::string& s)
 }
 
 #ifdef ENABLE_MESSAGE_DIGEST
-std::string fileHexDigest
-(const std::shared_ptr<MessageDigest>& ctx, const std::string& filename)
+std::string fileHexDigest(MessageDigest* ctx, const std::string& filename)
 {
   std::shared_ptr<DiskWriter> writer(new DefaultDiskWriter(filename));
   writer->openExistingFile();

test/TestUtil.h

@@ -52,8 +52,7 @@ std::string fromHex(const std::string& s);
 
 #ifdef ENABLE_MESSAGE_DIGEST
 // Returns hex digest of contents of file denoted by filename.
-std::string fileHexDigest
-(const std::shared_ptr<MessageDigest>& ctx, const std::string& filename);
+std::string fileHexDigest(MessageDigest* ctx, const std::string& filename);
 #endif // ENABLE_MESSAGE_DIGEST
 
 WrDiskCacheEntry::DataCell* createDataCell(int64_t goff,

test/UTMetadataDataExtensionMessageTest.cc

@@ -79,7 +79,7 @@ void UTMetadataDataExtensionMessageTest::testDoReceivedAction()
 
   unsigned char infoHash[INFO_HASH_LENGTH];
   message_digest::digest(infoHash, INFO_HASH_LENGTH,
-                         MessageDigest::sha1(),
+                         MessageDigest::sha1().get(),
                          metadata.data(), metadata.size());
   {
     auto attrs = make_unique<TorrentAttribute>();

test/UTMetadataPostDownloadHandlerTest.cc

@@ -74,7 +74,7 @@ void UTMetadataPostDownloadHandlerTest::testGetNextRequestGroups()
     "6:pieces60:AAAAAAAAAAAAAAAAAAAABBBBBBBBBBBBBBBBBBBBCCCCCCCCCCCCCCCCCCCCe";
   unsigned char infoHash[20];
   message_digest::digest
-    (infoHash, sizeof(infoHash), MessageDigest::sha1(),
+    (infoHash, sizeof(infoHash), MessageDigest::sha1().get(),
      reinterpret_cast<const unsigned char*>(metadata.data()), metadata.size());
   dctx_->getFirstFileEntry()->setLength(metadata.size());
   std::vector<std::vector<std::string> > announceList;