1 files changed, 66 insertions, 0 deletions
diff --git a/doc/examples/rsa_kgen.cpp b/doc/examples/rsa_kgen.cpp
new file mode 100644
index 000000000..f4566263b
--- /dev/null
+++ b/doc/examples/rsa_kgen.cpp
@@ -0,0 +1,66 @@
+/*
+* (C) 2002 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+/*
+Generate an RSA key of a specified bitlength, and put it into a pair of key
+files. One is the public key in X.509 format (PEM encoded), the private key is
+in PKCS #8 format (also PEM encoded).
+*/
+
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <cstdlib>
+#include <memory>
+
+#include <botan/botan.h>
+#include <botan/rsa.h>
+using namespace Botan;
+
+int main(int argc, char* argv[])
+   {
+   if(argc != 2 && argc != 3)
+      {
+      std::cout << "Usage: " << argv[0] << " bitsize [passphrase]"
+                << std::endl;
+      return 1;
+      }
+
+   u32bit bits = std::atoi(argv[1]);
+   if(bits < 1024 || bits > 16384)
+      {
+      std::cout << "Invalid argument for bitsize" << std::endl;
+      return 1;
+      }
+
+   Botan::LibraryInitializer init;
+
+   std::ofstream pub("rsapub.pem");
+   std::ofstream priv("rsapriv.pem");
+   if(!priv || !pub)
+      {
+      std::cout << "Couldn't write output files" << std::endl;
+      return 1;
+      }
+
+   try
+      {
+      AutoSeeded_RNG rng;
+
+      RSA_PrivateKey key(rng, bits);
+      pub << X509::PEM_encode(key);
+
+      if(argc == 2)
+         priv << PKCS8::PEM_encode(key);
+      else
+         priv << PKCS8::PEM_encode(key, rng, argv[2]);
+      }
+   catch(std::exception& e)
+      {
+      std::cout << "Exception caught: " << e.what() << std::endl;
+      }
+   return 0;
+   }