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// Copyright 2005-2020 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.
#ifndef MUMBLE_CRYPTSTATE_H_
#define MUMBLE_CRYPTSTATE_H_
#include <openssl/aes.h>
#define AES_KEY_SIZE_BITS 128
#define AES_KEY_SIZE_BYTES (AES_KEY_SIZE_BITS/8)
#include "Timer.h"
class CryptState {
private:
Q_DISABLE_COPY(CryptState)
public:
unsigned char raw_key[AES_KEY_SIZE_BYTES];
unsigned char encrypt_iv[AES_BLOCK_SIZE];
unsigned char decrypt_iv[AES_BLOCK_SIZE];
unsigned char decrypt_history[0x100];
unsigned int uiGood;
unsigned int uiLate;
unsigned int uiLost;
unsigned int uiResync;
unsigned int uiRemoteGood;
unsigned int uiRemoteLate;
unsigned int uiRemoteLost;
unsigned int uiRemoteResync;
AES_KEY encrypt_key;
AES_KEY decrypt_key;
Timer tLastGood;
Timer tLastRequest;
bool bInit;
CryptState();
bool isValid() const;
void genKey();
void setKey(const unsigned char *rkey, const unsigned char *eiv, const unsigned char *div);
void setDecryptIV(const unsigned char *iv);
void ocb_encrypt(const unsigned char *plain, unsigned char *encrypted, unsigned int len, const unsigned char *nonce, unsigned char *tag);
void ocb_decrypt(const unsigned char *encrypted, unsigned char *plain, unsigned int len, const unsigned char *nonce, unsigned char *tag);
bool decrypt(const unsigned char *source, unsigned char *dst, unsigned int crypted_length);
void encrypt(const unsigned char *source, unsigned char *dst, unsigned int plain_length);
};
#endif
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