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/*
* (C) 2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
/**
Generate a 1024 bit DSA key and put it into a file. The public key
format is that specified by X.509, while the private key format is
PKCS #8.
The domain parameters are the ones specified as the Java default DSA
parameters. There is nothing special about these, it's just the only
1024-bit DSA parameter set that's included in Botan at the time of
this writing. The application always reads/writes all of the domain
parameters to/from the file, so a new set could be used without any
problems. We could generate a new set for each key, or read a set of
DSA params from a file and use those, but they mostly seem like
needless complications.
*/
#include <iostream>
#include <fstream>
#include <string>
#include <botan/botan.h>
#include <botan/dsa.h>
#include <botan/rng.h>
using namespace Botan;
#include <memory>
int main(int argc, char* argv[])
{
if(argc != 1 && argc != 2)
{
std::cout << "Usage: " << argv[0] << " [passphrase]" << std::endl;
return 1;
}
Botan::LibraryInitializer init;
std::ofstream priv("dsapriv.pem");
std::ofstream pub("dsapub.pem");
if(!priv || !pub)
{
std::cout << "Couldn't write output files" << std::endl;
return 1;
}
try
{
AutoSeeded_RNG rng;
DL_Group group(rng, DL_Group::DSA_Kosherizer, 2048, 256);
DSA_PrivateKey key(rng, group);
pub << X509::PEM_encode(key);
if(argc == 1)
priv << PKCS8::PEM_encode(key);
else
priv << PKCS8::PEM_encode(key, rng, argv[1]);
}
catch(std::exception& e)
{
std::cout << "Exception caught: " << e.what() << std::endl;
}
return 0;
}
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