I am having trouble initializing a CryptoPP::DSA::PublicKey object by
loading the contents of a Version 1 X.509 certificate (.cer) file
created with keytool, using SHA1withDSA and stored in binary format.
DSA::PublicKey.Load() throws "BER decode error". I'm using Crypto++
5.4 on Windows 2000 with Visual C++ 6.0.
Is there a specific format that Crypto++ requires? Does it only
accept a subset of the X.509 fields?
Below is a simple program that demonstrates the problem:
#define CRYPTOPP_DEFAULT_NO_DLL
#include "dll.h"
#include <config.h>
#include <cryptlib.h>
#include <rng.h>
#include <base64.h>
#include <dsa.h>
USING_NAMESPACE(CryptoPP)
int main(int argc, char* argv[])
{
try
{
std::string pubKeyStr;
FileSource certificate("test.cer", true, new
StringSink(pubKeyStr));
StringSource ss(pubKeyStr, true);
DSA::PublicKey pubKey;
pubKey.Load(ss);
std::cout << "Loaded key successfully"
<< std::endl << std::flush;
}
catch (Exception ex)
{
std::cerr << "FAILED to load Public Key: "
<< ex.what() << std::endl << std::flush;
}
catch (std::exception e)
{
std::cerr << "FAILED to load Public Key: "
<< e.what() << std::endl << std::flush;
}
catch (...)
{
std::cerr << "FAILED to load Public Key, exception caught"
<< std::endl << std::flush;
}
return 0;
}
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