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Diffstat (limited to 'old/botan/doc/examples/dh.cpp')
-rw-r--r-- | old/botan/doc/examples/dh.cpp | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/old/botan/doc/examples/dh.cpp b/old/botan/doc/examples/dh.cpp new file mode 100644 index 0000000..c808928 --- /dev/null +++ b/old/botan/doc/examples/dh.cpp @@ -0,0 +1,59 @@ +/* + A simple DH example + + Written by Jack Lloyd (lloyd@randombit.net), on December 24, 2003 + + This file is in the public domain +*/ +#include <botan/botan.h> +#include <botan/dh.h> +#include <botan/rng.h> +using namespace Botan; + +#include <iostream> +#include <memory> + +int main() + { + Botan::LibraryInitializer init; + + try + { + AutoSeeded_RNG rng; + + // Alice creates a DH key and sends (the public part) to Bob + DH_PrivateKey private_a(rng, 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(rng, 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; + } |