text: // Copyright (c) 2014-2019 The Ttm Core developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef BITCOIN_MESSAGESIGNER_H
  #define BITCOIN_MESSAGESIGNER_H
  
  #include <key.h>
  
  /** Helper class for signing messages and checking their signatures
   */
  class CMessageSigner
  {
  public:
      /// Set the private/public key values, returns true if successful
      static bool GetKeysFromSecret(const std::string& strSecret, CKey& keyRet, CPubKey& pubkeyRet);
      /// Sign the message, returns true if successful
      static bool SignMessage(const std::string& strMessage, std::vector<unsigned char>& vchSigRet, const CKey& key);
      /// Verify the message signature, returns true if succcessful
      static bool VerifyMessage(const CPubKey& pubkey, const std::vector<unsigned char>& vchSig, const std::string& strMessage, std::string& strErrorRet);
      /// Verify the message signature, returns true if succcessful
      static bool VerifyMessage(const CKeyID& keyID, const std::vector<unsigned char>& vchSig, const std::string& strMessage, std::string& strErrorRet);
  };
  
  /** Helper class for signing hashes and checking their signatures
   */
  class CHashSigner
  {
  public:
      /// Sign the hash, returns true if successful
      static bool SignHash(const uint256& hash, const CKey& key, std::vector<unsigned char>& vchSigRet);
      /// Verify the hash signature, returns true if succcessful
      static bool VerifyHash(const uint256& hash, const CPubKey& pubkey, const std::vector<unsigned char>& vchSig, std::string& strErrorRet);
      /// Verify the hash signature, returns true if succcessful
      static bool VerifyHash(const uint256& hash, const CKeyID& keyID, const std::vector<unsigned char>& vchSig, std::string& strErrorRet);
  };
  
  #endif // BITCOIN_MESSAGESIGNER_H
  