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/*
Decrypt an encrypted DSA private key. Then use that key to sign a message.
Written by Jack Lloyd (lloyd@randombit.net), August 5, 2002
Updated to use X.509 and PKCS #8 format keys, October 21, 2002
This file is in the public domain
*/
#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
#include <memory>
#include <botan/botan.h>
#include <botan/look_pk.h>
#include <botan/dsa.h>
using namespace Botan;
const std::string SUFFIX = ".sig";
int main(int argc, char* argv[])
{
if(argc != 4)
{
std::cout << "Usage: " << argv[0] << " keyfile messagefile passphrase"
<< std::endl;
return 1;
}
try {
std::string passphrase(argv[3]);
std::ifstream message(argv[2]);
if(!message)
{
std::cout << "Couldn't read the message file." << std::endl;
return 1;
}
std::string outfile = argv[2] + SUFFIX;
std::ofstream sigfile(outfile.c_str());
if(!sigfile)
{
std::cout << "Couldn't write the signature to "
<< outfile << std::endl;
return 1;
}
std::auto_ptr<RandomNumberGenerator> rng(
RandomNumberGenerator::make_rng());
std::auto_ptr<PKCS8_PrivateKey> key(
PKCS8::load_key(argv[1], *rng, passphrase)
);
DSA_PrivateKey* dsakey = dynamic_cast<DSA_PrivateKey*>(key.get());
if(!dsakey)
{
std::cout << "The loaded key is not a DSA key!\n";
return 1;
}
PK_Signer signer(*dsakey, "EMSA1(SHA-1)");
DataSource_Stream in(message);
byte buf[4096] = { 0 };
while(u32bit got = in.read(buf, sizeof(buf)))
signer.update(buf, got);
Pipe pipe(new Base64_Encoder);
pipe.process_msg(signer.signature(*rng));
sigfile << pipe.read_all_as_string() << std::endl;
}
catch(std::exception& e)
{
std::cout << "Exception caught: " << e.what() << std::endl;
}
return 0;
}
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