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List:       botan-devel
Subject:    Re: [botan-devel] El Gamal keys import problem
From:       "Giacomo D'Amico" <speed1625 () gmail ! com>
Date:       2012-09-19 17:49:58
Message-ID: CAH49JJPksVm=b4=eBjtGecg8BLQDx5xUkOqjU+EiuV823f2=Xg () mail ! gmail ! com
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Thanks very much!! But I have another problem....."Exception caught:
Botan: Decoding error: X.509 public key decoding failed".
The modified code is:

#include <string>
#include <botan/botan.h>
#include <botan/elgamal.h>
#include <botan/look_pk.h>

using namespace Botan;

#include <fstream>
#include <iostream>
#include <memory>

std::ofstream pub("elgpub.pem");
std::ofstream priv("elgpriv.pem");

void start();
void load();

int main(int argc, char* argv[])
	{
		Botan::LibraryInitializer init;
		#if BOTAN_VERSION_CODE < BOTAN_VERSION_CODE_FOR(1,9,4)
		Botan::global_state().set("oid2str", "1.3.6.1.4.1.3029.1.2.1", "ElGamal");
		Botan::global_state().set("str2oid", "ElGamal", "1.3.6.1.4.1.3029.1.2.1");
		#endif
		AutoSeeded_RNG rng;
		start();
		load();
		return 0;
	}

void start() {
	try
		{
			AutoSeeded_RNG rng;
			DL_Group gruppo("modp/ietf/1024");

			// generate a 2048 bit ElGamal key

			ElGamal_PrivateKey key(rng, gruppo);
			pub << X509::PEM_encode(key);
			priv << PKCS8::PEM_encode(key);
			pub.flush();
                        priv.flush();
		}
   	catch(std::exception& e)
		{
      			std::cout << "Exception caught: " << e.what() << std::endl;
      		}
}

void load()
	{
	try
		{
			DataSource_Stream pubb("elgpub.pem");
			X509_PublicKey* pubkey = X509::load_key(pubb);
		}
	catch(std::exception& e)
		{
			std::cout << "Exception caught: " << e.what() << std::endl;
      		}

	}

Thanks a lot!


2012/9/19 Jack Lloyd <lloyd@randombit.net>:
>
> Likely this is caused by the source being empty.
>
> You write to elgpub.pem but the ofstream was not closed or flushed, so
> the contents are just waiting in an buffer rather than going to disk.
> So when you later try to reread the file, it exists but has no
> contents. Probably if you add something like `pub.flush()` after you
> write to the stream the problem would go away because the key will
> have made it to the filesystem.
>
> -Jack
>
> On Wed, Sep 19, 2012 at 07:22:01PM +0200, Giacomo D'Amico wrote:
>> I have a problem with El Gamal key import (botan release 1.8.13). I
>> use the code below and the result is "Exception caught: Botan: I/O
>> error: ASN1::maybe_BER: Source was empty", would someone help me?
>> Thanks a lot.
>>
>> #include <string>
>> #include <botan/botan.h>
>> #include <botan/elgamal.h>
>> #include <botan/look_pk.h>
>>
>> using namespace Botan;
>>
>> #include <fstream>
>> #include <iostream>
>> #include <memory>
>>
>> std::ofstream pub("elgpub.pem");
>> std::ofstream priv("elgpriv.pem");
>>
>> void start();
>> void load();
>>
>> int main(int argc, char* argv[])
>>       {
>>               Botan::LibraryInitializer init;
>>               #if BOTAN_VERSION_CODE < BOTAN_VERSION_CODE_FOR(1,9,4)
>>               Botan::global_state().set("oid2str", "1.3.6.1.4.1.3029.1.2.1", "ElGamal");
>>               Botan::global_state().set("str2oid", "ElGamal", "1.3.6.1.4.1.3029.1.2.1");
>>               #endif
>>               AutoSeeded_RNG rng;
>>               start();
>>               load();
>>               return 0;
>>       }
>>
>> void start() {
>>       try
>>               {
>>                       AutoSeeded_RNG rng;
>>                       DL_Group gruppo("modp/ietf/1024");
>>
>>                       // generate a 2048 bit ElGamal key
>>
>>                       ElGamal_PrivateKey key(rng, gruppo);
>>                       pub << X509::PEM_encode(key);
>>                       priv << PKCS8::PEM_encode(key);
>>               }
>>       catch(std::exception& e)
>>               {
>>                               std::cout << "Exception caught: " << e.what() << std::endl;
>>                       }
>> }
>>
>> void load()
>>       {
>>       try
>>               {
>>                       DataSource_Stream pubb("elgpub.pem");
>>                       X509_PublicKey* pubkey = X509::load_key(pubb);
>>               }
>>       catch(std::exception& e)
>>               {
>>                       std::cout << "Exception caught: " << e.what() << std::endl;
>>                       }
>>
>>       }
>> _______________________________________________
>> botan-devel mailing list
>> botan-devel@randombit.net
>> http://lists.randombit.net/mailman/listinfo/botan-devel
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