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/*
* (C) 2014,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "apps.h"
#if defined(BOTAN_HAS_DSA)
#include <botan/dsa.h>
#include <botan/pubkey.h>
#include <botan/pkcs8.h>
#include <botan/base64.h>
#include <fstream>
namespace {
int dsa_sign(const std::vector<std::string> &args)
{
using namespace Botan;
const std::string SUFFIX = ".sig";
if(args.size() != 4)
{
std::cout << "Usage: " << args[0] << " keyfile messagefile passphrase"
<< std::endl;
return 1;
}
try {
std::string passphrase(args[3]);
std::ifstream message(args[2], std::ios::binary);
if(!message)
{
std::cout << "Couldn't read the message file." << std::endl;
return 1;
}
std::string outfile = args[2] + SUFFIX;
std::ofstream sigfile(outfile);
if(!sigfile)
{
std::cout << "Couldn't write the signature to "
<< outfile << std::endl;
return 1;
}
AutoSeeded_RNG rng;
std::unique_ptr<PKCS8_PrivateKey> key(
PKCS8::load_key(args[1], rng, passphrase)
);
DSA_PrivateKey* dsakey = dynamic_cast<DSA_PrivateKey*>(key.get());
if(!dsakey)
{
std::cout << "The loaded key is not a DSA key!" << std::endl;
return 1;
}
PK_Signer signer(*dsakey, "EMSA1(SHA-1)");
DataSource_Stream in(message);
byte buf[4096] = { 0 };
while(size_t got = in.read(buf, sizeof(buf)))
signer.update(buf, got);
sigfile << base64_encode(signer.signature(rng)) << std::endl;
}
catch(std::exception& e)
{
std::cout << "Exception caught: " << e.what() << std::endl;
}
return 0;
}
REGISTER_APP(dsa_sign);
}
#endif
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