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/*
gen-random.cpp
Copyright (c) 2025 g10 Code GmbH
Software engineering by Ingo Klöcker <dev@ingo-kloecker.de>
This file is part of GPGME++'s test suite.
GPGME++ is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
GPGME++ is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this program; if not, see <https://gnu.org/licenses/>.
SPDX-License-Identifier: LGPL-2.0-or-later
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <context.h>
#include <randomresults.h>
#include <charconv>
#include <iostream>
#include <optional>
#include <string_view>
using namespace GpgME;
static int show_usage(int ex)
{
std::cerr << "usage: run-genrandom COMMAND\n\n"
"Commands:\n"
" --number LIMIT generate a random number in the range [0, LIMIT)\n"
" --bytes COUNT generate COUNT random bytes\n"
" --zbase32 generate 30 random zbase32 characters\n";
exit(ex);
}
template<typename IntegerType>
static std::optional<IntegerType> parseNumberArgument(std::string_view s)
{
IntegerType value{};
if (std::from_chars(s.data(), s.data() + s.size(), value).ec == std::errc{}) {
return value;
}
return {};
}
enum Command
{
None,
Number,
Bytes,
ZBase32,
};
int main (int argc, char **argv)
{
int last_argc = -1;
Command command = Command::None;
bool needsNumber = false;
if (argc) {
argc--; argv++;
}
while (argc && last_argc != argc ) {
last_argc = argc;
if (!strcmp (*argv, "--")) {
argc--; argv++;
break;
} else if (!strcmp (*argv, "--help")) {
show_usage (0);
} else if (!strcmp (*argv, "--number")) {
command = Command::Number;
needsNumber = true;
argc--; argv++;
} else if (!strcmp (*argv, "--bytes")) {
command = Command::Bytes;
needsNumber = true;
argc--; argv++;
} else if (!strcmp (*argv, "--zbase32")) {
command = Command::ZBase32;
needsNumber = false;
argc--; argv++;
} else if (!strncmp (*argv, "--", 2)) {
show_usage (1);
}
}
if (command == Command::None) {
std::cerr << "Error: No command given." << std::endl;
show_usage(1);
}
if ((needsNumber && (argc != 1)) || (!needsNumber && (argc != 0))) {
show_usage (1);
}
unsigned int number{};
if (needsNumber) {
const auto parsedNumber = parseNumberArgument<unsigned int>(*argv);
if (!parsedNumber) {
std::cerr << "Error: Invalid number " << *argv << std::endl;
show_usage(1);
}
number = parsedNumber.value();
}
GpgME::initializeLibrary();
auto ctx = Context::create(OpenPGP);
if (!ctx) {
std::cerr << "Failed to create Context";
return -1;
}
switch (command) {
case Number: {
const auto result = ctx->generateRandomValue(number);
if (result.error()) {
std::cerr << "Error: Failed to generate a random number: " << result.error().asStdString() << std::endl;
} else {
std::cout << result.value() << std::endl;
}
break;
}
case Bytes: {
const auto result = ctx->generateRandomBytes(number);
if (result.error()) {
std::cerr << "Error: Failed to generate random bytes: " << result.error().asStdString() << std::endl;
} else {
for (const auto &b : result.value()) {
std::cout << b;
}
}
break;
}
case ZBase32: {
const auto result = ctx->generateRandomBytes(31, Context::RandomMode::ZBase32);
if (result.error()) {
std::cerr << "Error: Failed to generate random zbase32 characters: " << result.error().asStdString() << std::endl;
} else {
std::string password;
password.reserve(result.value().size());
std::copy(result.value().begin(), result.value().end(), std::back_inserter(password));
std::cout << password << std::endl;
}
break;
}
default: ;
}
return 0;
}
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