c-libp2p/include/libp2p/secio/secio.h

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#pragma once
#include "libp2p/crypto/key.h"
#include "libp2p/crypto/rsa.h"
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/**
* A secure connection
*/
enum IPTrafficType { TCP, UDP };
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struct SecureSession {
// to get the connection started
char* host;
int port;
enum IPTrafficType traffic_type;
// once the connection is established
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struct Stream* stream;
// filled in during negotiations
char* chosen_curve;
char* chosen_cipher;
char* chosen_hash;
unsigned char* shared_key; // a shared key based off of the ephemeral private key
size_t shared_key_size;
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unsigned char* mac;
size_t mac_size;
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int (*mac_function)(const unsigned char*, size_t, unsigned char*);
// local only stuff
char local_nonce[16];
unsigned char* ephemeral_public_key; // bytes of x and y
size_t ephemeral_public_key_size;
struct StretchedKey* local_stretched_key;
// remote stuff
char remote_nonce[16];
struct PublicKey remote_key;
char* remote_peer_id;
unsigned char* remote_ephemeral_public_key;
size_t remote_ephemeral_public_key_size;
struct StretchedKey* remote_stretched_key;
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};
/***
* performs initial communication over an insecure channel to share
* keys, IDs, and initiate connection. This is a framed messaging system
* @param session the secure session to be filled
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* @param private_key the local private key to use
* @param remote_requested the other side is who asked for the upgrade
* @returns true(1) on success, false(0) otherwise
*/
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int libp2p_secio_handshake(struct SecureSession* session, struct RsaPrivateKey* private_key, int remote_requested);