dm: прямой обмен сообщениями (DM) + soundtouch + архитектура звонков
- src/dm/: dm_core/dm_crypto/dm_mailbox — прямой обмен сообщениями (DM) - lib/soundtouch-master/: vendored SoundTouch (изменение темпа/высоты аудио) - doc/dm_arch.md, doc/chat_call_arch.md: архитектура DM и звонков - tests: test_dm.c, test_dm_e2e.c - chat: рефакторинг chat_* модулей, member_sync, invite_build - chatgui/chatgui-android: синхронизация с новым API чата - lib/u_async, debug_config, utun_instance: сопутствующие изменения
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/*
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* dm_crypto.c — криптография прямого чата (DM)
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*/
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#include "dm_crypto.h"
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#include "../../lib/debug_config.h"
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#define OPENSSL_API_COMPAT 0x10100000L
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#include <openssl/evp.h>
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#include <openssl/sha.h>
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#include <string.h>
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#include <stdio.h>
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#define DM_ID "dm_crypto"
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uint64_t dm_derive_conv_id(uint64_t a, uint64_t b) {
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uint64_t lo = a < b ? a : b;
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uint64_t hi = a < b ? b : a;
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SHA256_CTX ctx;
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uint8_t hash[32];
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SHA256_Init(&ctx);
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SHA256_Update(&ctx, "utun_dm_v1", 9);
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SHA256_Update(&ctx, &lo, 8);
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SHA256_Update(&ctx, &hi, 8);
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SHA256_Final(hash, &ctx);
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uint64_t id;
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memcpy(&id, hash, 8);
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id &= 0x7FFFFFFFFFFFFFFFULL;
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if (id == 0) id = 1;
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return id;
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}
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int dm_derive_content_key(const uint8_t my_priv[32], const uint8_t peer_pub[32],
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uint8_t out[DM_CONTENT_KEY_SIZE]) {
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if (!my_priv || !peer_pub || !out) return -1;
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EVP_PKEY* my_pkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_X25519, NULL, my_priv, 32);
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if (!my_pkey) { DEBUG_ERROR(DEBUG_CATEGORY_DM, "%s: EVP_PKEY_new_raw_private_key failed", DM_ID); return -1; }
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EVP_PKEY* peer_pkey = EVP_PKEY_new_raw_public_key(EVP_PKEY_X25519, NULL, peer_pub, 32);
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if (!peer_pkey) { EVP_PKEY_free(my_pkey); DEBUG_ERROR(DEBUG_CATEGORY_DM, "%s: EVP_PKEY_new_raw_public_key failed", DM_ID); return -1; }
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EVP_PKEY_CTX* dctx = EVP_PKEY_CTX_new(my_pkey, NULL);
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uint8_t shared[32];
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size_t shared_len = sizeof(shared);
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int rc = -1;
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if (!dctx) goto out;
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if (EVP_PKEY_derive_init(dctx) <= 0) goto out;
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if (EVP_PKEY_derive_set_peer(dctx, peer_pkey) <= 0) goto out;
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if (EVP_PKEY_derive(dctx, shared, &shared_len) <= 0 || shared_len != sizeof(shared)) goto out;
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SHA256_CTX sctx;
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SHA256_Init(&sctx);
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SHA256_Update(&sctx, shared, sizeof(shared));
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SHA256_Update(&sctx, "utun_dm_content", 15);
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SHA256_Final(out, &sctx);
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rc = 0;
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out:
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if (dctx) EVP_PKEY_CTX_free(dctx);
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EVP_PKEY_free(my_pkey);
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EVP_PKEY_free(peer_pkey);
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if (rc != 0) DEBUG_ERROR(DEBUG_CATEGORY_DM, "%s: X25519 derive failed", DM_ID);
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return rc;
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}
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void dm_build_nonce(uint64_t conv_id, uint64_t author, uint64_t seq, uint8_t nonce[DM_NONCE_SIZE]) {
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SHA256_CTX ctx;
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uint8_t hash[32];
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SHA256_Init(&ctx);
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SHA256_Update(&ctx, &conv_id, 8);
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SHA256_Update(&ctx, &author, 8);
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SHA256_Update(&ctx, &seq, 8);
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SHA256_Final(hash, &ctx);
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memcpy(nonce, hash, DM_NONCE_SIZE);
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}
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static int dm_ccm_crypt(const uint8_t key[DM_CONTENT_KEY_SIZE], const uint8_t nonce[DM_NONCE_SIZE],
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const uint8_t* in, size_t in_len, uint8_t* out, size_t* out_len,
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int encrypt, const uint8_t* tag_in) {
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if (!key || !nonce || !in || !out || !out_len) return -1;
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EVP_CIPHER_CTX* ectx = EVP_CIPHER_CTX_new();
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if (!ectx) return -1;
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const EVP_CIPHER* cipher = EVP_aes_256_ccm();
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int rc = -1;
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if (encrypt) {
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if (EVP_EncryptInit_ex(ectx, cipher, NULL, NULL, NULL) != 1
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|| EVP_CIPHER_CTX_ctrl(ectx, EVP_CTRL_AEAD_SET_IVLEN, DM_NONCE_SIZE, NULL) != 1
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|| EVP_CIPHER_CTX_ctrl(ectx, EVP_CTRL_AEAD_SET_TAG, DM_TAG_SIZE, NULL) != 1
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|| EVP_EncryptInit_ex(ectx, NULL, NULL, key, nonce) != 1) goto done;
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int outl;
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if (EVP_EncryptUpdate(ectx, out, &outl, in, (int)in_len) != 1 || outl != (int)in_len) goto done;
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int tmpl;
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if (EVP_EncryptFinal_ex(ectx, out + outl, &tmpl) != 1) goto done;
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if (EVP_CIPHER_CTX_ctrl(ectx, EVP_CTRL_AEAD_GET_TAG, DM_TAG_SIZE, out + in_len) != 1) goto done;
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*out_len = in_len + DM_TAG_SIZE;
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} else {
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if (in_len < DM_TAG_SIZE) goto done;
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size_t body = in_len - DM_TAG_SIZE;
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if (EVP_DecryptInit_ex(ectx, cipher, NULL, NULL, NULL) != 1
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|| EVP_CIPHER_CTX_ctrl(ectx, EVP_CTRL_AEAD_SET_IVLEN, DM_NONCE_SIZE, NULL) != 1
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|| EVP_CIPHER_CTX_ctrl(ectx, EVP_CTRL_AEAD_SET_TAG, DM_TAG_SIZE, (void*)(tag_in ? tag_in : in + body)) != 1
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|| EVP_DecryptInit_ex(ectx, NULL, NULL, key, nonce) != 1) goto done;
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int outl;
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if (EVP_DecryptUpdate(ectx, out, &outl, in, (int)body) != 1 || outl != (int)body) goto done;
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int tmpl;
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if (EVP_DecryptFinal_ex(ectx, out + outl, &tmpl) != 1) goto done;
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*out_len = body;
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}
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rc = 0;
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done:
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EVP_CIPHER_CTX_free(ectx);
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return rc;
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}
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int dm_encrypt(const uint8_t key[DM_CONTENT_KEY_SIZE], const uint8_t nonce[DM_NONCE_SIZE],
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const uint8_t* plain, size_t plain_len, uint8_t* out, size_t* out_len) {
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return dm_ccm_crypt(key, nonce, plain, plain_len, out, out_len, 1, NULL);
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}
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int dm_decrypt(const uint8_t key[DM_CONTENT_KEY_SIZE], const uint8_t nonce[DM_NONCE_SIZE],
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const uint8_t* ct, size_t ct_len, uint8_t* out, size_t* out_len) {
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return dm_ccm_crypt(key, nonce, ct, ct_len, out, out_len, 0, NULL);
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}
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