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#include <llarp/crypto_async.h>
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#include <llarp/router_contact.h>
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#include <llarp/mem.h>
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#include <string.h>
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#include "buffer.hpp"
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#include "mem.hpp"
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struct llarp_async_iwp
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{
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struct llarp_crypto *crypto;
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struct llarp_logic *logic;
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struct llarp_threadpool *worker;
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};
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namespace iwp
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{
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void
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inform_keygen(void *user)
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{
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iwp_async_keygen *keygen = static_cast< iwp_async_keygen * >(user);
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keygen->hook(keygen);
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}
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void
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keygen(void *user)
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{
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iwp_async_keygen *keygen = static_cast< iwp_async_keygen * >(user);
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keygen->iwp->crypto->encryption_keygen(keygen->keybuf);
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llarp_thread_job job = {.user = user, .work = &inform_keygen};
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llarp_logic_queue_job(keygen->iwp->logic, job);
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}
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void
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inform_intro(void *user)
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{
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iwp_async_intro *intro = static_cast< iwp_async_intro * >(user);
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intro->hook(intro);
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}
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void
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gen_intro(void *user)
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{
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iwp_async_intro *intro = static_cast< iwp_async_intro * >(user);
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llarp_sharedkey_t sharedkey;
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llarp_shorthash_t e_k;
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llarp_nonce_t n;
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llarp_crypto *crypto = intro->iwp->crypto;
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byte_t tmp[64];
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// S = TKE(a.k, b.k, n)
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crypto->transport_dh_client(sharedkey, intro->remote_pubkey,
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intro->secretkey, intro->nonce);
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auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
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// copy nonce
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memcpy(n, intro->nonce, 24);
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// e_k = HS(b.k + n)
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memcpy(tmp, intro->remote_pubkey, 32);
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memcpy(tmp + 32, intro->nonce, 32);
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crypto->shorthash(e_k, buf);
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// e = SE(a.k, e_k, n[0:24])
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memcpy(intro->buf + 64, llarp_seckey_topublic(intro->secretkey), 32);
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buf.base = intro->buf + 64;
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buf.cur = buf.base;
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buf.sz = 32;
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crypto->xchacha20(buf, e_k, n);
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// h = MDS( n + e + w0, S)
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buf.base = intro->buf + 32;
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buf.cur = buf.base;
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buf.sz = intro->sz - 32;
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crypto->hmac(intro->buf, buf, sharedkey);
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// inform result
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llarp_logic_queue_job(intro->iwp->logic, {intro, &inform_intro});
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}
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void
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verify_intro(void *user)
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{
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iwp_async_intro *intro = static_cast< iwp_async_intro * >(user);
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auto crypto = intro->iwp->crypto;
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llarp_sharedkey_t sharedkey;
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llarp_shorthash_t e_K;
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llarp_hmac_t h;
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llarp_nonce_t N;
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byte_t tmp[64];
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auto OurPK = llarp_seckey_topublic(intro->secretkey);
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// e_k = HS(b.k + n)
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memcpy(tmp, OurPK, 32);
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memcpy(tmp + 32, intro->nonce, 32);
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auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
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crypto->shorthash(e_K, buf);
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// a.k = SD(x, e_k, n[0:24])
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memcpy(N, intro->nonce, 24);
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buf.base = intro->remote_pubkey;
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buf.cur = buf.base;
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buf.sz = 32;
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memcpy(intro->remote_pubkey, intro->buf + 64, 32);
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crypto->xchacha20(buf, e_K, N);
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// S = TKE(a.k, b.k, n)
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crypto->transport_dh_server(sharedkey, intro->remote_pubkey,
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intro->secretkey, intro->nonce);
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// h = MDS( n + e + w2 )
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buf.base = intro->buf + 32;
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buf.cur = buf.base;
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buf.sz = intro->sz - 32;
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crypto->hmac(h, buf, sharedkey);
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if(memcmp(h, intro->buf, 32))
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{
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// hmac fail
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intro->buf = nullptr;
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}
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// inform result
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llarp_logic_queue_job(intro->iwp->logic, {intro, &inform_intro});
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}
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void
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inform_introack(void *user)
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{
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iwp_async_introack *introack = static_cast< iwp_async_introack * >(user);
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introack->hook(introack);
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}
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void
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verify_introack(void *user)
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{
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iwp_async_introack *introack = static_cast< iwp_async_introack * >(user);
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auto crypto = introack->iwp->crypto;
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auto logic = introack->iwp->logic;
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llarp_hmac_t digest;
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llarp_sharedkey_t sharedkey;
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auto hmac = introack->buf;
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auto body = introack->buf + 32;
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auto pubkey = introack->remote_pubkey;
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auto secretkey = introack->secretkey;
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auto nonce = introack->buf + 32;
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auto token = introack->buf + 64;
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size_t bodysz = introack->sz - 32;
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llarp_buffer_t buf;
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buf.base = body;
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buf.cur = body;
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buf.sz = bodysz;
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// S = TKE(a.k, b.k, n)
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crypto->transport_dh_client(sharedkey, pubkey, secretkey, nonce);
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// h = MDS(n + x + w1, S)
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crypto->hmac(digest, buf, sharedkey);
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if(!llarp_eq(digest, hmac, 32))
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{
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// fail to verify hmac
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introack->buf = nullptr;
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}
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else
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{
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buf.base = token;
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buf.sz = 32;
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// token = SD(S, x, n[0:24])
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crypto->xchacha20(buf, sharedkey, nonce);
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// copy token
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memcpy(introack->token, token, 32);
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}
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llarp_logic_queue_job(logic, {introack, &inform_introack});
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}
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void
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gen_introack(void *user)
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{
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iwp_async_introack *introack = static_cast< iwp_async_introack * >(user);
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llarp_sharedkey_t sharedkey;
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auto crypto = introack->iwp->crypto;
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auto pubkey = introack->remote_pubkey;
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auto secretkey = introack->secretkey;
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auto nonce = introack->nonce;
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// S = TKE(a.k, b.k, n)
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crypto->transport_dh_server(sharedkey, pubkey, secretkey, nonce);
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// x = SE(S, token, n[0:24])
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llarp_buffer_t buf;
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buf.base = introack->buf + 64;
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buf.sz = 32;
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buf.cur = buf.base;
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memcpy(buf.base, introack->token, 32);
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crypto->xchacha20(buf, sharedkey, nonce);
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// h = MDS(n + x + w1, S)
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buf.base = introack->buf + 32;
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buf.sz = introack->sz - 32;
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buf.cur = buf.base;
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crypto->hmac(introack->buf, buf, sharedkey);
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llarp_logic_queue_job(introack->iwp->logic, {introack, &inform_introack});
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}
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void
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inform_session_start(void *user)
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{
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iwp_async_session_start *session =
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static_cast< iwp_async_session_start * >(user);
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session->hook(session);
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}
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void
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gen_session_start(void *user)
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{
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iwp_async_session_start *session =
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static_cast< iwp_async_session_start * >(user);
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auto crypto = session->iwp->crypto;
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auto dh = crypto->transport_dh_client;
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auto shorthash = crypto->shorthash;
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auto hmac = crypto->hmac;
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auto encrypt = crypto->xchacha20;
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auto logic = session->iwp->logic;
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auto a_sK = session->secretkey;
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auto b_K = session->remote_pubkey;
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auto N = session->nonce;
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auto token = session->token;
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auto K = session->sessionkey;
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llarp_sharedkey_t e_K;
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llarp_shorthash_t T;
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byte_t tmp[64];
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llarp_buffer_t buf;
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llarp::StackBuffer< decltype(tmp) >(buf, tmp);
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// T = HS(token + n)
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memcpy(tmp, token, 32);
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memcpy(tmp + 32, N, 32);
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shorthash(T, buf);
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// e_K = TKE(a.k, b.k, n)
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dh(e_K, b_K, a_sK, N);
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// K = TKE(a.k, b.k, T)
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dh(K, b_K, a_sK, T);
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// x = SE(e_K, token, n[0:24])
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buf.base = (session->buf + 64);
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buf.sz = 32;
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memcpy(buf.base, token, 32);
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encrypt(buf, e_K, N);
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// h = MDS(n + x + w2, e_K)
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buf.base = (session->buf + 32);
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buf.sz = session->sz - 32;
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hmac(session->buf, buf, e_K);
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llarp_logic_queue_job(logic, {user, &inform_session_start});
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}
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void
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verify_session_start(void *user)
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{
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iwp_async_session_start *session =
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static_cast< iwp_async_session_start * >(user);
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auto crypto = session->iwp->crypto;
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auto dh = crypto->transport_dh_server;
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auto shorthash = crypto->shorthash;
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auto hmac = crypto->hmac;
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auto decrypt = crypto->xchacha20;
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auto logic = session->iwp->logic;
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auto b_sK = session->secretkey;
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auto a_K = session->remote_pubkey;
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auto N = session->nonce;
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auto token = session->token;
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auto K = session->sessionkey;
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llarp_sharedkey_t e_K;
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llarp_shorthash_t T;
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byte_t tmp[64];
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llarp_buffer_t buf;
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// e_K = TKE(a.k, b.k, N)
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dh(e_K, a_K, b_sK, N);
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// h = MDS( n + x + w2, e_K)
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buf.base = session->buf + 32;
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buf.cur = buf.base;
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buf.sz = session->sz - 32;
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hmac(tmp, buf, e_K);
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if(memcmp(tmp, session->buf, 32) == 0)
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{
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// hmac good
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buf.base = session->buf + 64;
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buf.cur = buf.base;
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buf.sz = 32;
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// token = SD(e_K, x, n[0:24])
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decrypt(buf, e_K, N);
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// ensure it's the same token
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if(memcmp(buf.base, token, 32) == 0)
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{
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// T = HS(token + n)
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memcpy(tmp, token, 32);
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memcpy(tmp + 32, N, 32);
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buf.base = tmp;
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buf.cur = buf.base;
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buf.sz = sizeof(tmp);
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shorthash(T, buf);
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// K = TKE(a.k, b.k, T)
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dh(K, a_K, b_sK, T);
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}
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else // token missmatch
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{
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session->buf = nullptr;
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printf("token miss match\n");
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}
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}
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else // hmac fail
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session->buf = nullptr;
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llarp_logic_queue_job(logic, {user, &inform_session_start});
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}
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void
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inform_frame_done(void *user)
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{
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iwp_async_frame *frame = static_cast< iwp_async_frame * >(user);
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frame->hook(frame);
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delete frame;
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}
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void
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hmac_then_decrypt(void *user)
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{
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iwp_async_frame *frame = static_cast< iwp_async_frame * >(user);
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auto crypto = frame->iwp->crypto;
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byte_t *hmac = frame->buf;
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byte_t *nonce = frame->buf + 32;
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byte_t *body = frame->buf + 64;
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llarp_sharedkey_t digest;
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llarp_buffer_t buf;
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buf.base = nonce;
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buf.cur = buf.base;
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buf.sz = frame->sz - 32;
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// h = MDS(n + x, S)
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crypto->hmac(digest, buf, frame->sessionkey);
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// check hmac
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frame->success = memcmp(digest, hmac, 32) == 0;
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// x = SE(S, p, n[0:24])
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buf.base = body;
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buf.cur = buf.base;
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buf.sz = frame->sz - 64;
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crypto->xchacha20(buf, frame->sessionkey, nonce);
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// inform result
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llarp_logic_queue_job(frame->iwp->logic, {frame, &inform_frame_done});
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}
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void
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encrypt_then_hmac(void *user)
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{
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iwp_async_frame *frame = static_cast< iwp_async_frame * >(user);
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auto crypto = frame->iwp->crypto;
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byte_t *hmac = frame->buf;
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byte_t *nonce = frame->buf + 32;
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byte_t *body = frame->buf + 64;
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llarp_buffer_t buf;
|
|
|
|
buf.base = body;
|
|
|
|
buf.cur = buf.base;
|
|
|
|
buf.sz = frame->sz - 64;
|
|
|
|
|
|
|
|
// randomize N
|
|
|
|
crypto->randbytes(nonce, 32);
|
|
|
|
// x = SE(S, p, n[0:24])
|
|
|
|
crypto->xchacha20(buf, frame->sessionkey, nonce);
|
|
|
|
// h = MDS(n + x, S)
|
|
|
|
buf.base = nonce;
|
|
|
|
buf.cur = buf.base;
|
|
|
|
buf.sz = frame->sz - 32;
|
|
|
|
crypto->hmac(hmac, buf, frame->sessionkey);
|
|
|
|
// call result RIGHT HERE
|
|
|
|
frame->hook(frame);
|
|
|
|
delete frame;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// REFACTOR: same as llarp_async_iwp (unify and rename)
|
|
|
|
struct llarp_async_rc
|
|
|
|
{
|
|
|
|
struct llarp_crypto *crypto;
|
|
|
|
struct llarp_logic *logic;
|
|
|
|
struct llarp_threadpool *worker;
|
|
|
|
};
|
|
|
|
|
|
|
|
namespace rc {
|
|
|
|
|
|
|
|
void
|
|
|
|
inform_verify(void *user)
|
|
|
|
{
|
|
|
|
rc_async_verify *request = static_cast< rc_async_verify * >(user);
|
|
|
|
request->hook(request);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
verify(void *user)
|
|
|
|
{
|
|
|
|
rc_async_verify *request = static_cast< rc_async_verify * >(user);
|
|
|
|
request->result = llarp_rc_verify_sig(request->context->crypto, request->rc);
|
|
|
|
llarp_thread_job job = {.user = user, .work = &inform_verify};
|
|
|
|
llarp_logic_queue_job(request->context->logic, job);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
extern "C" {
|
|
|
|
|
|
|
|
void
|
|
|
|
iwp_call_async_keygen(struct llarp_async_iwp *iwp,
|
|
|
|
struct iwp_async_keygen *keygen)
|
|
|
|
{
|
|
|
|
keygen->iwp = iwp;
|
|
|
|
llarp_threadpool_queue_job(iwp->worker, {keygen, &iwp::keygen});
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
iwp_call_async_gen_intro(struct llarp_async_iwp *iwp,
|
|
|
|
struct iwp_async_intro *intro)
|
|
|
|
{
|
|
|
|
intro->iwp = iwp;
|
|
|
|
llarp_threadpool_queue_job(iwp->worker, {intro, &iwp::gen_intro});
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
iwp_call_async_verify_introack(struct llarp_async_iwp *iwp,
|
|
|
|
struct iwp_async_introack *introack)
|
|
|
|
{
|
|
|
|
introack->iwp = iwp;
|
|
|
|
llarp_threadpool_queue_job(iwp->worker, {introack, &iwp::verify_introack});
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
iwp_call_async_gen_session_start(struct llarp_async_iwp *iwp,
|
|
|
|
struct iwp_async_session_start *session)
|
|
|
|
{
|
|
|
|
session->iwp = iwp;
|
|
|
|
llarp_threadpool_queue_job(iwp->worker, {session, &iwp::gen_session_start});
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
iwp_call_async_verify_intro(struct llarp_async_iwp *iwp,
|
|
|
|
struct iwp_async_intro *intro)
|
|
|
|
{
|
|
|
|
intro->iwp = iwp;
|
|
|
|
llarp_threadpool_queue_job(iwp->worker, {intro, &iwp::verify_intro});
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
iwp_call_async_gen_introack(struct llarp_async_iwp *iwp,
|
|
|
|
struct iwp_async_introack *introack)
|
|
|
|
{
|
|
|
|
introack->iwp = iwp;
|
|
|
|
llarp_threadpool_queue_job(iwp->worker, {introack, &iwp::gen_introack});
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
iwp_call_async_frame_decrypt(struct llarp_async_iwp *iwp,
|
|
|
|
struct iwp_async_frame *frame)
|
|
|
|
{
|
|
|
|
frame->iwp = iwp;
|
|
|
|
llarp_threadpool_queue_job(iwp->worker, {frame, &iwp::hmac_then_decrypt});
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
iwp_call_async_frame_encrypt(struct llarp_async_iwp *iwp,
|
|
|
|
struct iwp_async_frame *frame)
|
|
|
|
{
|
|
|
|
frame->iwp = iwp;
|
|
|
|
llarp_threadpool_queue_job(iwp->worker, {frame, &iwp::encrypt_then_hmac});
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
iwp_call_async_verify_session_start(struct llarp_async_iwp *iwp,
|
|
|
|
struct iwp_async_session_start *session)
|
|
|
|
{
|
|
|
|
session->iwp = iwp;
|
|
|
|
llarp_threadpool_queue_job(iwp->worker,
|
|
|
|
{session, &iwp::verify_session_start});
|
|
|
|
}
|
|
|
|
|
|
|
|
void rc_call_async_verify(struct llarp_async_rc *context,
|
|
|
|
struct rc_async_verify *request,
|
|
|
|
struct llarp_rc *rc)
|
|
|
|
{
|
|
|
|
request->context = context;
|
|
|
|
request->rc = rc;
|
|
|
|
llarp_threadpool_queue_job(context->worker,
|
|
|
|
{request, &rc::verify});
|
|
|
|
}
|
|
|
|
|
|
|
|
struct llarp_async_iwp *
|
|
|
|
llarp_async_iwp_new(struct llarp_crypto *crypto, struct llarp_logic *logic,
|
|
|
|
struct llarp_threadpool *worker)
|
|
|
|
{
|
|
|
|
llarp_async_iwp *iwp = new llarp_async_iwp;
|
|
|
|
if(iwp)
|
|
|
|
{
|
|
|
|
iwp->crypto = crypto;
|
|
|
|
iwp->logic = logic;
|
|
|
|
iwp->worker = worker;
|
|
|
|
}
|
|
|
|
return iwp;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
llarp_async_iwp_free(struct llarp_async_iwp *iwp)
|
|
|
|
{
|
|
|
|
delete iwp;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct llarp_async_rc *
|
|
|
|
llarp_async_rc_new(struct llarp_crypto *crypto, struct llarp_logic *logic,
|
|
|
|
struct llarp_threadpool *worker)
|
|
|
|
{
|
|
|
|
llarp_async_rc *context = new llarp_async_rc;
|
|
|
|
if(context)
|
|
|
|
{
|
|
|
|
context->crypto = crypto;
|
|
|
|
context->logic = logic;
|
|
|
|
context->worker = worker;
|
|
|
|
}
|
|
|
|
return context;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
llarp_async_rc_free(struct llarp_async_rc *context)
|
|
|
|
{
|
|
|
|
delete context;
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|