Method decrypt

src/cpp-ethereum/libdevcrypto/CryptoPP.cpp:233–266

}

void Secp256k1PP::decrypt(Secret const& _k, bytes& io_text)
{
	auto& ctx = Secp256k1PPCtx::get();
	CryptoPP::ECIES<CryptoPP::ECP>::Decryptor d;
	{
		Guard l(ctx.x_params);
		d.AccessKey().Initialize(ctx.m_params, secretToExponent(_k));
	}

	if (!io_text.size())
	{
		io_text.resize(1);
		io_text[0] = 0;
	}

	size_t clen = io_text.size();
	bytes plain;
	plain.resize(d.MaxPlaintextLength(io_text.size()));

	DecodingResult r;
	{
		Guard l(ctx.x_rng);
		r = d.Decrypt(ctx.m_rng, io_text.data(), clen, plain.data());
	}

	if (!r.isValidCoding)
	{
		io_text.clear();
		return;
	}

	io_text.resize(r.messageLength);
	io_text = std::move(plain);
}