int send_rsa(bool server, std::string data, std::string& recieved, int sock) {
CryptoPP::AutoSeededRandomPool rng;
//Do RSA Encryption here
std::string plain, encrypted, decrypted, signature, recovered, tdecoded;
bool result;
CryptoPP::RSAES_OAEP_SHA_Encryptor other_pub;
CryptoPP::RSAES_OAEP_SHA_Encryptor my_pub;
CryptoPP::RSAES_OAEP_SHA_Decryptor my_priv;
if(server)
{
{
CryptoPP::HexDecoder decoder;
decoder.Put( (byte*)bank_priv, bank_priv_size );
decoder.MessageEnd();
my_priv.AccessKey().Load( decoder );
}
{
CryptoPP::HexDecoder decoder;
decoder.Put( (byte*)atm_pub, atm_pub_size );
decoder.MessageEnd();
other_pub.AccessKey().Load( decoder );
}
{
CryptoPP::HexDecoder decoder;
decoder.Put( (byte*)bank_pub, bank_pub_size);
decoder.MessageEnd();
my_pub.AccessKey().Load( decoder );
}
}
else
{
{
CryptoPP::HexDecoder decoder;
decoder.Put( (byte*)atm_pub, atm_pub_size);
decoder.MessageEnd();
my_pub.AccessKey().Load( decoder );
}
{
CryptoPP::HexDecoder decoder;
decoder.Put( (byte*)bank_pub, bank_pub_size );
decoder.MessageEnd();
other_pub.AccessKey().Load( decoder );
}
{
CryptoPP::HexDecoder decoder;
decoder.Put( (byte*)atm_priv, atm_priv_size );
decoder.MessageEnd();
my_priv.AccessKey().Load( decoder );
}
}
CryptoPP::RSASS<CryptoPP::PSSR, CryptoPP::SHA1>::Signer signer( my_priv );
//Run the data through the RSA encryption
CryptoPP::StringSource( data, true, new CryptoPP::PK_EncryptorFilter( rng, other_pub, new CryptoPP::StringSink( encrypted )));
//Sign the encrypted data
size_t length = signer.MaxSignatureLength();
byte sig_buff[length];
signer.SignMessage(rng, (byte *)encrypted.c_str(), encrypted.length(), sig_buff);
signature.assign((char *)sig_buff, length);
CryptoPP::RSASS<CryptoPP::PSSR, CryptoPP::SHA1>::Verifier verifiermine( my_pub);
data.assign(std::to_string(signature.length()));
data.append("|");
data.append(signature);
data.append(encrypted);
int err = send_socket(data, recieved, sock);
if (err != 0) {
return -1;
}
if (recieved.find("|") == recieved.npos) {
return -1;
}
int sig_length = atoi(recieved.substr(0, recieved.find("|")).c_str());
if (sig_length == 0) {
return -1;
}
if (recieved.length() < sig_length + recieved.find("|")+1) {
return -1;
}
recieved = recieved.substr(recieved.find("|")+1, recieved.length()-recieved.find("|")-1);
std::string other_signature = recieved.substr(0, sig_length);
std::string other_encrypted = recieved.substr(sig_length, recieved.length() - sig_length);
if (other_signature.length() != (unsigned int)sig_length) {
return -1;
}
CryptoPP::RSASS<CryptoPP::PSSR, CryptoPP::SHA1>::Verifier verifier( other_pub );
result = verifier.VerifyMessage((byte *)other_encrypted.c_str(), other_encrypted.length(), (byte *)other_signature.c_str(), other_signature.length());
if (result == false)
{
return -1;//Signature failed if it returns -1
}
CryptoPP::StringSource( other_encrypted, true, new CryptoPP::PK_DecryptorFilter( rng, my_priv, new CryptoPP::StringSink( decrypted )));
recieved.assign(decrypted);
return 0;
}
void decodeHex(const byte * inString1, byte * inString2,const size_t length){
CryptoPP::HexDecoder hexDecoder;
hexDecoder.Put(inString1,length);
hexDecoder.MessageEnd();
hexDecoder.Get(inString2,length/2);
}