152 lines
4.3 KiB
C++
152 lines
4.3 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop 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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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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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014 John Preston, https://desktop.telegram.org
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*/
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#pragma once
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class mtpAuthKey {
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public:
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mtpAuthKey() : _isset(false), _dc(0) {
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}
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bool created() const {
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return _isset;
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}
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void setKey(const void *from) {
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memcpy(_key, from, 256);
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uchar sha1Buffer[20];
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_keyId = *(uint64*)(hashSha1(_key, 256, sha1Buffer) + 3);
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_isset = true;
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}
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void setDC(uint32 dc) {
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_dc = dc;
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}
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uint32 getDC() const {
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if (!_isset) throw mtpErrorKeyNotReady("getDC()");
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return _dc;
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}
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uint64 keyId() const {
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if (!_isset) throw mtpErrorKeyNotReady("keyId()");
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return _keyId;
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}
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void prepareAES(const MTPint128 &msgKey, MTPint256 &aesKey, MTPint256 &aesIV, bool send = true) const {
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if (!_isset) throw mtpErrorKeyNotReady(QString("prepareAES(.., %1)").arg(logBool(send)));
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uint32 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 + 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 + 32 + x, 16);
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memcpy(data_b + 16, &msgKey, 16);
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memcpy(data_b + 32, _key + 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 + 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 + 96 + x, 32);
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hashSha1(data_d, 16 + 32, sha1_d);
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uchar *key((uchar*)&aesKey), *iv((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 write(QDataStream &to) const {
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if (!_isset) throw mtpErrorKeyNotReady("write(..)");
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to.writeRawData(_key, 256);
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}
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static const uint64 RecreateKeyId = 0xFFFFFFFFFFFFFFFFL;
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private:
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char _key[256];
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uint64 _keyId;
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bool _isset;
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uint32 _dc;
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};
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typedef QSharedPointer<mtpAuthKey> mtpAuthKeyPtr;
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inline void aesEncrypt(const void *src, void *dst, uint32 len, void *key, 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((const uchar*)src, (uchar*)dst, len, &aes, aes_iv, AES_ENCRYPT);
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}
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inline void aesEncrypt(const void *src, void *dst, uint32 len, const mtpAuthKeyPtr &authKey, const MTPint128 &msgKey) {
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MTPint256 aesKey, aesIV;
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authKey->prepareAES(msgKey, aesKey, aesIV);
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return aesEncrypt(src, dst, len, &aesKey, &aesIV);
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}
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inline void aesEncryptLocal(const void *src, void *dst, uint32 len, const mtpAuthKey *authKey, const void *key128) {
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MTPint256 aesKey, aesIV;
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authKey->prepareAES(*(const MTPint128*)key128, aesKey, aesIV, false);
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return aesEncrypt(src, dst, len, &aesKey, &aesIV);
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}
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inline void aesDecrypt(const void *src, void *dst, uint32 len, void *key, 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((const uchar*)src, (uchar*)dst, len, &aes, aes_iv, AES_DECRYPT);
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}
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inline void aesDecrypt(const void *src, void *dst, uint32 len, const mtpAuthKeyPtr &authKey, const MTPint128 &msgKey) {
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MTPint256 aesKey, aesIV;
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authKey->prepareAES(msgKey, aesKey, aesIV, false);
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return aesDecrypt(src, dst, len, &aesKey, &aesIV);
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}
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inline void aesDecryptLocal(const void *src, void *dst, uint32 len, const mtpAuthKey *authKey, const void *key128) {
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MTPint256 aesKey, aesIV;
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authKey->prepareAES(*(const MTPint128*)key128, aesKey, aesIV, false);
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return aesDecrypt(src, dst, len, &aesKey, &aesIV);
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}
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