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https://github.com/moparisthebest/mailiverse
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63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
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#include <botan/botan.h>
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#include <botan/dh.h>
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#include <botan/pubkey.h>
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using namespace Botan;
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#include <iostream>
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#include <memory>
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int main()
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{
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try
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{
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LibraryInitializer init;
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AutoSeeded_RNG rng;
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// Alice and Bob agree on a DH domain to use
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DL_Group shared_domain("modp/ietf/2048");
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// Alice creates a DH key
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DH_PrivateKey private_a(rng, shared_domain);
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// Bob creates a key with a matching group
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DH_PrivateKey private_b(rng, shared_domain);
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// Alice sends to Bob her public key and a session parameter
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MemoryVector<byte> public_a = private_a.public_value();
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const std::string session_param =
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"Alice and Bob's shared session parameter";
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// Bob sends his public key to Alice
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MemoryVector<byte> public_b = private_b.public_value();
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// Now Alice performs the key agreement operation
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PK_Key_Agreement ka_alice(private_a, "KDF2(SHA-256)");
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SymmetricKey alice_key = ka_alice.derive_key(32, public_b, session_param);
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// Bob does the same:
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PK_Key_Agreement ka_bob(private_b, "KDF2(SHA-256)");
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SymmetricKey bob_key = ka_bob.derive_key(32, public_a, session_param);
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if(alice_key == bob_key)
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{
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std::cout << "The two keys matched, everything worked\n";
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std::cout << "The shared key was: " << alice_key.as_string() << "\n";
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}
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else
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{
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std::cout << "The two keys didn't match! Hmmm...\n";
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std::cout << "Alice's key was: " << alice_key.as_string() << "\n";
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std::cout << "Bob's key was: " << bob_key.as_string() << "\n";
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}
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// Now use the shared key for encryption or MACing or whatever
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}
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catch(std::exception& e)
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{
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std::cout << e.what() << std::endl;
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return 1;
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}
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return 0;
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}
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