a very simple 128bit Diffie–Hellman key exchange algorithm
gcc test.c dhexchange.c -o test
./test
the result looks like:
alice_private= 21020c4a4c949fd14d0cf2a2402f2aff
alice_public= 500c1bdba67f00684715fa5cdaf82724
bob_private= ad7521da95e27fc1e96c4bcda7e650b6
bob_public= c3e1e42bcb39d2f64b4c222fc6510801
alice_secret= c5156ec39e8bb1e7940f8dbfd53fd89c
bob_secret= c5156ec39e8bb1e7940f8dbfd53fd89c
http://en.wikipedia.org/wiki/Diffie%E2%80%93Hellman_key_exchange
(1) Alice: Generate private key and public key
DH_KEY alice_private, alice_public;
DH_generate_key_pair(alice_public, alice_private);
(2) Bob: Generate private key and public key
DH_KEY bob_private, bob_public;
DH_generate_key_pair(bob_public, bob_private);
(3) Exchange: Alice send her public key to Bob, and Bob send his public key to alice
(4) Alice: Generate secret key
DH_KEY alice_secret;
DH_generate_key_secret(alice_secret, alice_private, bob_public);
(5) Bob: Generate secret key
DH_KEY bob_secret;
DH_generate_key_secret(bob_secret, bob_private, alice_public);
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