transmission/libtransmission/crypto.h

89 lines
2.5 KiB
C

/*
* This file Copyright (C) 2007-2014 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
* $Id$
*/
#ifndef TR_ENCRYPTION_H
#define TR_ENCRYPTION_H
#ifndef __TRANSMISSION__
#error only libtransmission should #include this header.
#endif
#include <inttypes.h>
#include "crypto-utils.h"
#include "utils.h" /* TR_GNUC_NULL_TERMINATED */
/**
*** @addtogroup peers
*** @{
**/
enum
{
KEY_LEN = 96
};
/** @brief Holds state information for encrypted peer communications */
typedef struct
{
tr_rc4_ctx_t dec_key;
tr_rc4_ctx_t enc_key;
tr_dh_ctx_t dh;
uint8_t myPublicKey[KEY_LEN];
tr_dh_secret_t mySecret;
uint8_t torrentHash[SHA_DIGEST_LENGTH];
bool isIncoming;
bool torrentHashIsSet;
}
tr_crypto;
/** @brief construct a new tr_crypto object */
void tr_cryptoConstruct (tr_crypto * crypto, const uint8_t * torrentHash, bool isIncoming);
/** @brief destruct an existing tr_crypto object */
void tr_cryptoDestruct (tr_crypto * crypto);
void tr_cryptoSetTorrentHash (tr_crypto * crypto, const uint8_t * torrentHash);
const uint8_t* tr_cryptoGetTorrentHash (const tr_crypto * crypto);
bool tr_cryptoHasTorrentHash (const tr_crypto * crypto);
bool tr_cryptoComputeSecret (tr_crypto * crypto,
const uint8_t * peerPublicKey);
const uint8_t* tr_cryptoGetMyPublicKey (const tr_crypto * crypto,
int * setme_len);
void tr_cryptoDecryptInit (tr_crypto * crypto);
void tr_cryptoDecrypt (tr_crypto * crypto,
size_t buflen,
const void * buf_in,
void * buf_out);
void tr_cryptoEncryptInit (tr_crypto * crypto);
void tr_cryptoEncrypt (tr_crypto * crypto,
size_t buflen,
const void * buf_in,
void * buf_out);
bool tr_cryptoSecretKeySha1 (const tr_crypto * crypto,
const void * prepend_data,
size_t prepend_data_size,
const void * append_data,
size_t append_data_size,
uint8_t * hash);
/* @} */
#endif