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#include <botan/botan.h>
#include <botan/pkcs5.h>
#include <iostream>
#include <memory>
using namespace Botan;
std::string password_hash(const std::string& pass,
RandomNumberGenerator& rng);
bool password_hash_ok(const std::string& pass, const std::string& hash);
int main(int argc, char* argv[])
{
if(argc != 2 && argc != 3)
{
std::cerr << "Usage: " << argv[0] << " password\n";
std::cerr << "Usage: " << argv[0] << " password hash\n";
return 1;
}
try
{
if(argc == 2)
{
std::auto_ptr<RandomNumberGenerator> rng(
RandomNumberGenerator::make_rng());
std::cout << "H('" << argv[1] << "') = "
<< password_hash(argv[1], *rng) << '\n';
}
else
{
bool ok = password_hash_ok(argv[1], argv[2]);
if(ok)
std::cout << "Password and hash match\n";
else
std::cout << "Password and hash do not match\n";
}
}
catch(std::exception& e)
{
std::cerr << e.what() << '\n';
return 1;
}
return 0;
}
std::string password_hash(const std::string& pass,
RandomNumberGenerator& rng)
{
PKCS5_PBKDF2 kdf("SHA-1");
kdf.set_iterations(10000);
kdf.new_random_salt(rng, 6); // 48 bits
Pipe pipe(new Base64_Encoder);
pipe.start_msg();
pipe.write(kdf.current_salt());
pipe.write(kdf.derive_key(12, pass).bits_of());
pipe.end_msg();
return pipe.read_all_as_string();
}
bool password_hash_ok(const std::string& pass, const std::string& hash)
{
Pipe pipe(new Base64_Decoder);
pipe.start_msg();
pipe.write(hash);
pipe.end_msg();
SecureVector<byte> hash_bin = pipe.read_all();
PKCS5_PBKDF2 kdf("SHA-1");
kdf.set_iterations(10000);
kdf.change_salt(hash_bin, 6);
SecureVector<byte> cmp = kdf.derive_key(12, pass).bits_of();
return same_mem(cmp.begin(), hash_bin.begin() + 6, 12);
}
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