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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 <fstream>
#include <botan/pubkey.h>
#include <botan/dsa.h>
#include <botan/base64.h>
using namespace Botan;
namespace {
int dsa_verify(const std::vector<std::string> &args)
{
if(args.size() != 4)
{
std::cout << "Usage: " << args[0]
<< " keyfile messagefile sigfile" << std::endl;
return 1;
}
try {
std::ifstream message(args[2], std::ios::binary);
if(!message)
{
std::cout << "Couldn't read the message file." << std::endl;
return 1;
}
std::ifstream sigfile(args[3]);
if(!sigfile)
{
std::cout << "Couldn't read the signature file." << std::endl;
return 1;
}
std::string sigstr;
getline(sigfile, sigstr);
std::unique_ptr<X509_PublicKey> key(X509::load_key(args[1]));
DSA_PublicKey* dsakey = dynamic_cast<DSA_PublicKey*>(key.get());
if(!dsakey)
{
std::cout << "The loaded key is not a DSA key!" << std::endl;
return 1;
}
secure_vector<byte> sig = base64_decode(sigstr);
PK_Verifier ver(*dsakey, "EMSA1(SHA-1)");
DataSource_Stream in(message);
byte buf[4096] = { 0 };
while(size_t got = in.read(buf, sizeof(buf)))
ver.update(buf, got);
const bool ok = ver.check_signature(sig);
if(ok)
{
std::cout << "Signature verified" << std::endl;
return 0;
}
else
{
std::cout << "Signature did NOT verify" << std::endl;
return 1;
}
}
catch(std::exception& e)
{
std::cout << "Exception caught: " << e.what() << std::endl;
return 2;
}
}
REGISTER_APP(dsa_verify);
}
#endif
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