#includeCKey key; std::string message = "Hello World!"; uint256 hash = Hash(message); // Use SHA256 hash function std::vector vchSig; key.Sign(hash, vchSig); // Digital signature
#includeThis example is using CKey Sign library to verify a digital signature for a message. The library is used to sign the message with a private key and generate a digital signature in the form of a vector of unsigned characters. The library is also used to verify the signature with the public key and hash of the original message. The package library for CKey Sign is Bitcoin-Core library.CKey key; std::string message = "Hello World!"; uint256 hash = Hash(message); // Use SHA256 hash function std::vector vchSig; bool bVerified = false; key.Sign(hash, vchSig); // Digital signature CKeyID sender = key.GetPubKey().GetID(); CPubKey pubKey; pubKey.SetCompactSignature(vchSig); // Convert signature to compact form bVerified = pubKey.Verify(hash, vchSig); // Verify signature