transmission/libtransmission/crypto.h

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/*
* 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.
*
*/
#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"
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#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, uint8_t const* torrentHash, bool isIncoming);
/** @brief destruct an existing tr_crypto object */
void tr_cryptoDestruct(tr_crypto* crypto);
void tr_cryptoSetTorrentHash(tr_crypto* crypto, uint8_t const* torrentHash);
uint8_t const* tr_cryptoGetTorrentHash(tr_crypto const* crypto);
bool tr_cryptoHasTorrentHash(tr_crypto const* crypto);
bool tr_cryptoComputeSecret(tr_crypto* crypto, uint8_t const* peerPublicKey);
uint8_t const* tr_cryptoGetMyPublicKey(tr_crypto const* crypto, int* setme_len);
void tr_cryptoDecryptInit(tr_crypto* crypto);
void tr_cryptoDecrypt(tr_crypto* crypto, size_t buflen, void const* buf_in, void* buf_out);
void tr_cryptoEncryptInit(tr_crypto* crypto);
void tr_cryptoEncrypt(tr_crypto* crypto, size_t buflen, void const* buf_in, void* buf_out);
bool tr_cryptoSecretKeySha1(tr_crypto const* crypto, void const* prepend_data, size_t prepend_data_size,
void const* append_data, size_t append_data_size, uint8_t* hash);
/* @} */
#endif