c++ - How to print out the private key in ECDSA by using crypto++? -


i trying use elliptic curve dsa.

in part of "generate private key" in following code using crypto++ library, private exponent printed out in console.

how can print out private key itself?

int main( int, char** ) {      autoseededrandompool prng;     bytequeue privatekey, publickey, testkey;      string message = "do or not. there no try.";      //////////////////////////////////////////////////////      // generate private key     ecdsa<ecp, sha1>::privatekey privkey;     privkey.initialize( prng, secp256r1() );     privkey.save( privatekey );      cout<<"the size : "<<sizeof(privatekey)<<endl;      cout<<"output 1 : "<< privkey.getprivateexponent() <<endl;     cout<<"output 2 : "<< std::hex << privkey.getprivateexponent() <<endl;     cout<<"output 3 : "<< std::hex << &privatekey <<endl;     cout<<"output 4 : "<< std::hex << &privkey <<endl;      // create public key     ecdsa<ecp, sha1>::publickey pubkey;     privkey.makepublickey( pubkey );     pubkey.save( publickey );      //////////////////////////////////////////////////////          // load private key (in bytequeue, pkcs#8 format)     ecdsa<ecp, sha1>::signer signer( privatekey );      // determine maximum size, allocate string size     size_t siglen = signer.maxsignaturelength();     string signature(siglen, 0x00);      // sign, , trim signature actual size     siglen = signer.signmessage( prng, (const byte*)message.data(), message.size(), (byte*)signature.data() );     signature.resize(siglen);      //////////////////////////////////////////////////////          // load public key (in bytequeue, x509 format)     ecdsa<ecp, sha1>::verifier verifier( publickey );      bool result = verifier.verifymessage( (const byte*)message.data(), message.size(), (const byte*)signature.data(), signature.size() );     if(result)         cout << "verified signature on message" << endl;     else         cerr << "failed verify signature on message" << endl;      return 0; }


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