Initial checkin1.5.6

1 files changed, 54 insertions, 0 deletions

diff --git a/doc/examples/dh.cpp b/doc/examples/dh.cpp
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+/*
+  A simple DH example
+
+  Written by Jack Lloyd ([email protected]), on December 24, 2003
+
+  This file is in the public domain
+*/
+#include <botan/botan.h>
+#include <botan/dh.h>
+using namespace Botan;
+
+#include <iostream>
+
+int main()
+   {
+   try {
+      LibraryInitializer init;
+
+      // Alice creates a DH key and sends (the public part) to Bob
+      DH_PrivateKey private_a(DL_Group("modp/ietf/1024"));
+      DH_PublicKey public_a = private_a; // Bob gets this
+
+      // Bob creates a key with a matching group
+      DH_PrivateKey private_b(public_a.get_domain());
+
+      // Bob sends the key back to Alice
+      DH_PublicKey public_b = private_b; // Alice gets this
+
+      // Both of them create a key using their private key and the other's
+      // public key
+      SymmetricKey alice_key = private_a.derive_key(public_b);
+      SymmetricKey bob_key = private_b.derive_key(public_a);
+
+      if(alice_key == bob_key)
+         {
+         std::cout << "The two keys matched, everything worked\n";
+         std::cout << "The shared key was: " << alice_key.as_string() << "\n";
+         }
+      else
+         {
+         std::cout << "The two keys didn't match!\n";
+         std::cout << "Alice's key was: " << alice_key.as_string() << "\n";
+         std::cout << "Bob's key was: " << bob_key.as_string() << "\n";
+         }
+
+      // Now Alice and Bob hash the key and use it for something
+   }
+   catch(std::exception& e)
+      {
+      std::cout << e.what() << std::endl;
+      return 1;
+      }
+   return 0;
+   }