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#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <map>
#include <memory>
#include <botan/botan.h>
#include <botan/look_pk.h>
#include <botan/dsa.h>
using namespace Botan;
bool check(std::map<std::string, std::string>);
int main()
{
try {
Botan::LibraryInitializer init;
std::ifstream in("SigGen.rsp");
if(!in)
throw Exception("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 Decoding_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 == "S")
{
bool result = check(inputs);
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";
}
inputs["Msg"] = inputs["R"] = inputs["S"] = "";
}
}
}
catch(std::exception& e)
{
std::cout << e.what() << std::endl;
return 1;
}
return 0;
}
bool check(std::map<std::string, std::string> inputs)
{
BigInt p("0x"+inputs["P"]),
q("0x"+inputs["Q"]),
g("0x"+inputs["G"]),
y("0x"+inputs["Y"]);
DSA_PublicKey key(DL_Group(p, q, g), y);
Pipe pipe(new Hex_Decoder);
pipe.process_msg(inputs["Msg"]);
pipe.start_msg();
pipe.write(inputs["R"]);
pipe.write(inputs["S"] );
pipe.end_msg();
std::auto_ptr<PK_Verifier> verify(get_pk_verifier(key, "EMSA1(SHA-1)"));
return verify->verify_message(pipe.read_all(0), pipe.read_all(1));
}
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