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#include <llarp/crypto_async.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_alloc *mem;
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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->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_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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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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llarp_buffer_t buf;
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llarp::StackBuffer< decltype(tmp) >(buf, 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 + 32, llarp_seckey_topublic(intro->secretkey), 32);
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buf.base = intro->buf + 32;
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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.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_gen_intro});
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}
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void
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inform_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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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_thread_job job = {.user = user, .work = &inform_verify_introack};
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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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llarp_logic_queue_job(logic, job);
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return;
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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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llarp_logic_queue_job(logic, job);
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}
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void
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inform_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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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 + 32);
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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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// K = TKE(a.k, b.k, T)
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dh(K, b_K, a_sK, T);
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llarp_logic_queue_job(logic, {user, &inform_gen_session_start});
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}
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}
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extern "C" {
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void
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iwp_call_async_keygen(struct llarp_async_iwp *iwp,
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struct iwp_async_keygen *keygen)
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{
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keygen->iwp = iwp;
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llarp_threadpool_queue_job(iwp->worker, {keygen, &iwp::keygen});
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}
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void
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iwp_call_async_gen_intro(struct llarp_async_iwp *iwp,
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struct iwp_async_intro *intro)
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{
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intro->iwp = iwp;
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llarp_threadpool_queue_job(iwp->worker, {intro, &iwp::gen_intro});
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}
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void
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iwp_call_async_verify_introack(struct llarp_async_iwp *iwp,
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struct iwp_async_introack *introack)
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{
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introack->iwp = iwp;
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llarp_threadpool_queue_job(iwp->worker, {introack, &iwp::verify_introack});
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}
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void
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iwp_call_async_gen_session_start(struct llarp_async_iwp *iwp,
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struct iwp_async_session_start *session)
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{
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session->iwp = iwp;
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llarp_threadpool_queue_job(iwp->worker, {session, &iwp::gen_session_start});
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}
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void
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iwp_call_async_frame_decrypt(struct llarp_async_iwp *iwp,
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struct iwp_async_frame *frame)
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{
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}
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struct llarp_async_iwp *
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llarp_async_iwp_new(struct llarp_alloc *mem, struct llarp_crypto *crypto,
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struct llarp_logic *logic, struct llarp_threadpool *worker)
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{
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llarp_async_iwp *iwp = new llarp_async_iwp;
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if(iwp)
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{
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iwp->mem = mem;
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iwp->crypto = crypto;
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iwp->logic = logic;
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iwp->worker = worker;
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}
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return iwp;
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}
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void
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llarp_async_iwp_free(struct llarp_async_iwp *iwp)
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{
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delete iwp;
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}
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}
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