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/*
* (C) 2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <map>
#include <memory>
#include <botan/botan.h>
#include <botan/auto_rng.h>
#include <botan/dsa.h>
#include <botan/numthry.h>
#include <botan/dl_group.h>
using namespace Botan;
bool check(RandomNumberGenerator& rng,
std::map<std::string, std::string>);
int main()
{
try {
Botan::LibraryInitializer init("use_engines");
AutoSeeded_RNG rng;
std::ifstream in("PQGGen.rsp");
if(!in)
throw std::runtime_error("Can't open response file");
std::map<std::string, std::string> inputs;
while(in.good())
{
std::string line;
std::getline(in, line);
if(line == "" || line[0] == '[' || line[0] == '#')
continue;
std::vector<std::string> name_and_val = split_on(line, '=');
if(name_and_val.size() != 2)
throw std::runtime_error("Unexpected input: " + line);
name_and_val[0].erase(name_and_val[0].size()-1);
name_and_val[1].erase(0, 1);
std::string name = name_and_val[0], value = name_and_val[1];
inputs[name] = value;
if(name == "H")
{
bool result = check(rng, inputs);
std::cout << "." << std::flush;
if(result == false)
{
std::cout << " Check failed\n";
std::map<std::string, std::string>::const_iterator i;
for(i = inputs.begin(); i != inputs.end(); i++)
std::cout << i->first << " = " << i->second << "\n";
std::cout << "\n";
}
inputs.clear();
}
}
}
catch(std::exception& e)
{
std::cout << e.what() << std::endl;
return 1;
}
return 0;
}
bool check(RandomNumberGenerator& rng,
std::map<std::string, std::string> inputs)
{
BigInt p("0x"+inputs["P"]),
q("0x"+inputs["Q"]),
g("0x"+inputs["G"]),
h("0x"+inputs["H"]);
if(h < 1 || h >= p-1) return false;
//u32bit c = to_u32bit(inputs["c"]);
Pipe pipe(new Hex_Decoder);
pipe.process_msg(inputs["Seed"]);
SecureVector<byte> seed = pipe.read_all();
BigInt our_p, our_q;
u32bit qbits = (p.bits() <= 1024) ? 160 : 256;
Algorithm_Factory& af = global_state().algorithm_factory();
bool found = generate_dsa_primes(rng, af, our_p, our_q,
p.bits(), qbits, seed);
if(!found) /* bad seed */
return false;
if(our_p != p) return false;
if(our_q != q) return false;
BigInt our_g = power_mod(h, (p-1)/q, p);
if(our_g != g) return false;
return true;
}
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