mirror of https://github.com/procxx/kepka.git
129 lines
4.3 KiB
C++
129 lines
4.3 KiB
C++
//
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// This file is part of Kepka,
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// an unofficial desktop version of Telegram messaging app,
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// see https://github.com/procxx/kepka
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//
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// Kepka is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// It is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// In addition, as a special exception, the copyright holders give permission
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// to link the code of portions of this program with the OpenSSL library.
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//
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// Full license: https://github.com/procxx/kepka/blob/master/LICENSE
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// Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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// Copyright (c) 2017- Kepka Contributors, https://github.com/procxx
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//
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#include "mtproto/auth_key.h"
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#include <openssl/aes.h>
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extern "C" {
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#include <openssl/modes.h>
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}
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namespace MTP {
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void AuthKey::prepareAES_oldmtp(const MTPint128 &msgKey, MTPint256 &aesKey, MTPint256 &aesIV, bool send) const {
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quint32 x = send ? 0 : 8;
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uchar data_a[16 + 32], sha1_a[20];
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memcpy(data_a, &msgKey, 16);
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memcpy(data_a + 16, _key.data() + x, 32);
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hashSha1(data_a, 16 + 32, sha1_a);
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uchar data_b[16 + 16 + 16], sha1_b[20];
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memcpy(data_b, _key.data() + 32 + x, 16);
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memcpy(data_b + 16, &msgKey, 16);
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memcpy(data_b + 32, _key.data() + 48 + x, 16);
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hashSha1(data_b, 16 + 16 + 16, sha1_b);
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uchar data_c[32 + 16], sha1_c[20];
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memcpy(data_c, _key.data() + 64 + x, 32);
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memcpy(data_c + 32, &msgKey, 16);
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hashSha1(data_c, 32 + 16, sha1_c);
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uchar data_d[16 + 32], sha1_d[20];
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memcpy(data_d, &msgKey, 16);
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memcpy(data_d + 16, _key.data() + 96 + x, 32);
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hashSha1(data_d, 16 + 32, sha1_d);
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auto key = reinterpret_cast<uchar *>(&aesKey);
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auto iv = reinterpret_cast<uchar *>(&aesIV);
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memcpy(key, sha1_a, 8);
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memcpy(key + 8, sha1_b + 8, 12);
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memcpy(key + 8 + 12, sha1_c + 4, 12);
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memcpy(iv, sha1_a + 8, 12);
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memcpy(iv + 12, sha1_b, 8);
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memcpy(iv + 12 + 8, sha1_c + 16, 4);
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memcpy(iv + 12 + 8 + 4, sha1_d, 8);
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}
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void AuthKey::countKeyId() {
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auto sha1 = hashSha1(_key.data(), _key.size());
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// Lower 64 bits = 8 bytes of 20 byte SHA1 hash.
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_keyId = *reinterpret_cast<KeyId *>(sha1.data() + 12);
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}
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void AuthKey::prepareAES(const MTPint128 &msgKey, MTPint256 &aesKey, MTPint256 &aesIV, bool send) const {
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quint32 x = send ? 0 : 8;
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uchar data_a[16 + 36], sha256_a[32];
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memcpy(data_a, &msgKey, 16);
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memcpy(data_a + 16, _key.data() + x, 36);
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hashSha256(data_a, 16 + 36, sha256_a);
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uchar data_b[36 + 16], sha256_b[32];
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memcpy(data_b, _key.data() + 40 + x, 36);
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memcpy(data_b + 36, &msgKey, 16);
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hashSha256(data_b, 36 + 16, sha256_b);
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auto key = reinterpret_cast<uchar *>(&aesKey);
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auto iv = reinterpret_cast<uchar *>(&aesIV);
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memcpy(key, sha256_a, 8);
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memcpy(key + 8, sha256_b + 8, 16);
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memcpy(key + 8 + 16, sha256_a + 24, 8);
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memcpy(iv, sha256_b, 8);
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memcpy(iv + 8, sha256_a + 8, 16);
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memcpy(iv + 8 + 16, sha256_b + 24, 8);
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}
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void aesIgeEncryptRaw(const void *src, void *dst, quint32 len, const void *key, const void *iv) {
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uchar aes_key[32], aes_iv[32];
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memcpy(aes_key, key, 32);
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memcpy(aes_iv, iv, 32);
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AES_KEY aes;
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AES_set_encrypt_key(aes_key, 256, &aes);
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AES_ige_encrypt(static_cast<const uchar *>(src), static_cast<uchar *>(dst), len, &aes, aes_iv, AES_ENCRYPT);
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}
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void aesIgeDecryptRaw(const void *src, void *dst, quint32 len, const void *key, const void *iv) {
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uchar aes_key[32], aes_iv[32];
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memcpy(aes_key, key, 32);
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memcpy(aes_iv, iv, 32);
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AES_KEY aes;
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AES_set_decrypt_key(aes_key, 256, &aes);
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AES_ige_encrypt(static_cast<const uchar *>(src), static_cast<uchar *>(dst), len, &aes, aes_iv, AES_DECRYPT);
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}
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void aesCtrEncrypt(void *data, quint32 len, const void *key, CTRState *state) {
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AES_KEY aes;
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AES_set_encrypt_key(static_cast<const uchar *>(key), 256, &aes);
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static_assert(CTRState::IvecSize == AES_BLOCK_SIZE, "Wrong size of ctr ivec!");
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static_assert(CTRState::EcountSize == AES_BLOCK_SIZE, "Wrong size of ctr ecount!");
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CRYPTO_ctr128_encrypt(static_cast<const uchar *>(data), static_cast<uchar *>(data), len, &aes, state->ivec,
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state->ecount, &state->num, (block128_f)AES_encrypt);
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}
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} // namespace MTP
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