mirror of
https://github.com/transmission/transmission
synced 2024-12-26 09:37:56 +00:00
123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
/*
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* This file Copyright (C) Mnemosyne LLC
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*
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* This file is licensed by the GPL version 2. Works owned by the
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* Transmission project are granted a special exemption to clause 2(b)
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* so that the bulk of its code can remain under the MIT license.
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* This exemption does not extend to derived works not owned by
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* the Transmission project.
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*
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* $Id$
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*/
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#ifndef TR_ENCRYPTION_H
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#define TR_ENCRYPTION_H
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#ifndef __TRANSMISSION__
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#error only libtransmission should #include this header.
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#endif
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#include <inttypes.h>
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#include "utils.h" /* TR_GNUC_NULL_TERMINATED */
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/**
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*** @addtogroup peers
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*** @{
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**/
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#include <openssl/dh.h> /* RC4_KEY */
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#include <openssl/rc4.h> /* DH */
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enum
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{
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KEY_LEN = 96
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};
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/** @brief Holds state information for encrypted peer communications */
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typedef struct
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{
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RC4_KEY dec_key;
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RC4_KEY enc_key;
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DH * dh;
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uint8_t myPublicKey[KEY_LEN];
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uint8_t mySecret[KEY_LEN];
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uint8_t torrentHash[SHA_DIGEST_LENGTH];
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bool isIncoming;
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bool torrentHashIsSet;
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bool mySecretIsSet;
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}
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tr_crypto;
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/** @brief construct a new tr_crypto object */
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void tr_cryptoConstruct( tr_crypto * crypto, const uint8_t * torrentHash, bool isIncoming );
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/** @brief destruct an existing tr_crypto object */
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void tr_cryptoDestruct( tr_crypto * crypto );
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void tr_cryptoSetTorrentHash( tr_crypto * crypto, const uint8_t * torrentHash );
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const uint8_t* tr_cryptoGetTorrentHash( const tr_crypto * crypto );
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int tr_cryptoHasTorrentHash( const tr_crypto * crypto );
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const uint8_t* tr_cryptoComputeSecret( tr_crypto * crypto,
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const uint8_t * peerPublicKey );
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const uint8_t* tr_cryptoGetMyPublicKey( const tr_crypto * crypto,
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int * setme_len );
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void tr_cryptoDecryptInit( tr_crypto * crypto );
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void tr_cryptoDecrypt( tr_crypto * crypto,
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size_t buflen,
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const void * buf_in,
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void * buf_out );
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void tr_cryptoEncryptInit( tr_crypto * crypto );
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void tr_cryptoEncrypt( tr_crypto * crypto,
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size_t buflen,
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const void * buf_in,
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void * buf_out );
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/* @} */
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/**
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*** @addtogroup utils Utilities
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*** @{
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**/
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/** @brief generate a SHA1 hash from one or more chunks of memory */
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void tr_sha1( uint8_t * setme,
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const void * content1,
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int content1_len,
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... ) TR_GNUC_NULL_TERMINATED;
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/** @brief returns a random number in the range of [0...n) */
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int tr_cryptoRandInt( int n );
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/**
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* @brief returns a pseudorandom number in the range of [0...n)
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*
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* This is faster, BUT WEAKER, than tr_cryptoRandInt() and never
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* be used in sensitive cases.
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* @see tr_cryptoRandInt()
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*/
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int tr_cryptoWeakRandInt( int n );
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/** @brief fill a buffer with random bytes */
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void tr_cryptoRandBuf( void * buf, size_t len );
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/** @brief generate a SSHA password from its plaintext source */
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char* tr_ssha1( const void * plaintext );
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/** @brief Validate a test password against the a ssha1 password */
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bool tr_ssha1_matches( const char * ssha1, const char * pass );
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/* @} */
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#endif
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