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#include <algorithm>
#include <random>
#include <sstream>
#include <tuple>
#include "signer/noscrypt_signer.hpp"
using namespace std;
nostr::signer::NoscryptSigner::NoscryptSigner(
shared_ptr<plog::IAppender> appender,
shared_ptr<nostr::service::INostrServiceBase> nostrService)
{
plog::init(plog::debug, appender.get());
this->noscryptContext = this->_initNoscryptContext();
if (this->noscryptContext == nullptr)
{
return;
}
const auto [privateKey, publicKey] = this->_createLocalKeypair();
this->localPrivateKey = privateKey;
this->localPublicKey = publicKey;
};
nostr::signer::NoscryptSigner::~NoscryptSigner()
{
NCDestroyContext(this->noscryptContext.get());
};
void nostr::signer::NoscryptSigner::receiveConnection(string connectionToken)
{
// Receive the connection token here.
};
void nostr::signer::NoscryptSigner::initiateConnection(
string relay,
string name,
string url,
string description)
{
// Initiate the connection here.
};
void nostr::signer::NoscryptSigner::sign(shared_ptr<data::Event> event)
{
// Sign the event here.
};
/**
* @brief Initializes the noscrypt library context into the class's `context` property.
* @returns `true` if successful, `false` otherwise.
*/
shared_ptr<NCContext> nostr::signer::NoscryptSigner::_initNoscryptContext()
{
shared_ptr<NCContext> context(new NCContext);
auto contextStructSize = NCGetContextStructSize();
unique_ptr<uint8_t> randomEntropy(new uint8_t[contextStructSize]);
random_device rd;
mt19937 gen(rd());
uniform_int_distribution<> dist(0, contextStructSize);
generate_n(randomEntropy.get(), contextStructSize, [&]() { return dist(gen); });
NCResult result = NCInitContext(context.get(), randomEntropy.get());
this->_logNoscryptResult(result);
if (result != NC_SUCCESS)
{
return nullptr;
}
return context;
};
void nostr::signer::NoscryptSigner::_logNoscryptResult(NCResult result)
{
switch (result) {
case NC_SUCCESS:
PLOG_INFO << "noscrypt - success";
break;
case E_NULL_PTR:
PLOG_ERROR << "noscrypt - error: A null pointer was passed to the initializer.";
break;
case E_INVALID_ARG:
PLOG_ERROR << "noscrypt - error: An invalid argument was passed to the initializer.";
break;
case E_INVALID_CONTEXT:
PLOG_ERROR << "noscrypt - error: The NCContext struct is in an invalid state.";
break;
case E_ARGUMENT_OUT_OF_RANGE:
PLOG_ERROR << "noscrypt - error: An initializer argument was outside the range of acceptable values.";
break;
case E_OPERATION_FAILED:
PLOG_ERROR << "noscrypt - error";
break;
}
};
/**
* @brief Generates a private/public key pair for local use.
* @returns The generated keypair of the form `[privateKey, publicKey]`, or a pair of empty
* strings if the function failed.
* @remarks This keypair is intended for temporary use, and should not be saved or used outside
* of this class.
*/
tuple<string, string> nostr::signer::NoscryptSigner::_createLocalKeypair()
{
string privateKey;
string publicKey;
// To generate a private key, all we need is a random 32-bit buffer.
unique_ptr<NCSecretKey> secretKey(new NCSecretKey);
random_device rd;
mt19937 gen(rd());
uniform_int_distribution<> dist(0, NC_SEC_KEY_SIZE);
generate_n(secretKey.get()->key, NC_SEC_KEY_SIZE, [&]() { return dist(gen); });
// Convert the buffer into a hex string for a more human-friendly representation.
stringstream secretKeyStream;
for (int i = 0; i < NC_SEC_KEY_SIZE; i++)
{
secretKeyStream << hex << setw(2) << setfill('0') << static_cast<int>(secretKey->key[i]);
}
privateKey = secretKeyStream.str();
// Use noscrypt to derive the public key from its private counterpart.
unique_ptr<NCPublicKey> pubkey(new NCPublicKey);
NCResult result = NCGetPublicKey(
this->noscryptContext.get(),
secretKey.get(),
pubkey.get());
this->_logNoscryptResult(result);
if (result != NC_SUCCESS)
{
// Return empty strings if the key generation fails.
return make_tuple(string(), string());
}
// Convert the now-populated pubkey buffer into a hex string for the pubkey representation
// used by Nostr events.
stringstream pubkeyStream;
for (int i = 0; i < NC_SEC_KEY_SIZE; i++)
{
pubkeyStream << hex << setw(2) << setfill('0') << static_cast<int>(pubkey->key[i]);
}
publicKey = pubkeyStream.str();
return make_tuple(privateKey, publicKey);
};
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