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+/*
+Generate a 1024 bit DSA key and put it into a file. The public key format is
+that specified by X.509, while the private key format is PKCS #8.
+
+The domain parameters are the ones specified as the Java default DSA
+parameters. There is nothing special about these, it's just the only 1024-bit
+DSA parameter set that's included in Botan at the time of this writing. The
+application always reads/writes all of the domain parameters to/from the file,
+so a new set could be used without any problems. We could generate a new set
+for each key, or read a set of DSA params from a file and use those, but they
+mostly seem like needless complications.
+
+Written by Jack Lloyd (lloyd@randombit.net), August 5, 2002
+ Updated to use X.509 and PKCS #8 formats, October 21, 2002
+
+This file is in the public domain
+*/
+
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <botan/botan.h>
+#include <botan/dsa.h>
+#include <botan/rng.h>
+using namespace Botan;
+
+#include <memory>
+
+int main(int argc, char* argv[])
+ {
+ if(argc != 1 && argc != 2)
+ {
+ std::cout << "Usage: " << argv[0] << " [passphrase]" << std::endl;
+ return 1;
+ }
+
+ Botan::LibraryInitializer init;
+
+ std::ofstream priv("dsapriv.pem");
+ std::ofstream pub("dsapub.pem");
+ if(!priv || !pub)
+ {
+ std::cout << "Couldn't write output files" << std::endl;
+ return 1;
+ }
+
+ try
+ {
+ AutoSeeded_RNG rng;
+
+ DL_Group group(rng, DL_Group::DSA_Kosherizer, 2048, 256);
+
+ DSA_PrivateKey key(rng, group);
+
+ pub << X509::PEM_encode(key);
+ if(argc == 1)
+ priv << PKCS8::PEM_encode(key);
+ else
+ priv << PKCS8::PEM_encode(key, rng, argv[1]);
+ }
+ catch(std::exception& e)
+ {
+ std::cout << "Exception caught: " << e.what() << std::endl;
+ }
+ return 0;
+ }