// receive coin
Coin<FIELD> decrypt(const SecretAddr<FIELD>& secretAddr,
const PublicAddr<FIELD>& publicAddr) const {
DECRYPTOR DEC(secretAddr.cryptoKey());
RANDPOOL RNG;
// recovered text length
const std::size_t rtextLen = DEC.MaxPlaintextLength(m_cipherText.size());
if (rtextLen) {
// recovered text bytes
std::vector<byte> rtext(rtextLen, 0xfb);
if (DEC.Decrypt(RNG,
m_cipherText.data(),
m_cipherText.size(),
rtext.data()).isValidCoding) {
// convert recovered text to stream
std::stringstream ss(std::string(rtext.begin(), rtext.end()));
Coin<FIELD> coin;
if (coin.marshal_in(ss, false)) { // false means omit public address
// set public address of recovered coin
coin.addr(publicAddr);
// must check:
// 1. cm matches pour transaction cm (coin exists in ledger)
// 2. serial number is not in ledger (not already spent)
if (coin.valid()) return coin;
}
}
}
return Coin<FIELD>(); // failed
}
// pour new coin
EncryptedCoin(const Coin<FIELD>& coin) {
ENCRYPTOR ENC(coin.addr().cryptoKey());
RANDPOOL RNG;
std::stringstream ss;
coin.marshal_out(ss, false); // false means omit public address
const std::string& ptext = ss.str();
const std::size_t ptextLen = ptext.length() + 1;
// encrypt message
m_cipherText = std::vector<byte>(ENC.CiphertextLength(ptextLen), 0xfb);
ENC.Encrypt(RNG,
reinterpret_cast<const byte*>(ptext.data()),
ptextLen,
m_cipherText.data());
}
