mirror of
https://github.com/transmission/transmission
synced 2024-12-26 01:27:28 +00:00
d424ed143e
On a way to factoring out OpenSSL support to a standalone file to ease
addition of other crypto libraries support in the future, move helpers
providing RC4 ciphering to crypto-utils.{c,h}. OpenSSL-related
functionality (RC4 context management) is moved to crypto-utils-openssl.c.
Add new tr_rc4_ctx_t type and functions to be implemented by crypto
backends:
* tr_rc4_new - allocate RC4 context,
* tr_rc4_free - free the context,
* tr_rc4_set_key - set cipher key,
* tr_rc4_process - cipher memory block.
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*
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* This file Copyright (C) 2007-2014 Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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* $Id$
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*/
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#ifndef TR_CRYPTO_UTILS_H
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#define TR_CRYPTO_UTILS_H
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#include <inttypes.h>
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#include <stddef.h>
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#include "utils.h" /* TR_GNUC_NULL_TERMINATED */
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/**
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*** @addtogroup utils Utilities
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*** @{
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**/
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/** @brief Opaque SHA1 context type. */
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typedef void * tr_sha1_ctx_t;
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/** @brief Opaque RC4 context type. */
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typedef void * tr_rc4_ctx_t;
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/**
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* @brief Generate a SHA1 hash from one or more chunks of memory.
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*/
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bool tr_sha1 (uint8_t * hash,
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const void * data1,
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int data1_length,
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...) TR_GNUC_NULL_TERMINATED;
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/**
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* @brief Allocate and initialize new SHA1 hasher context.
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*/
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tr_sha1_ctx_t tr_sha1_init (void);
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/**
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* @brief Update SHA1 hash.
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*/
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bool tr_sha1_update (tr_sha1_ctx_t handle,
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const void * data,
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size_t data_length);
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/**
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* @brief Finalize and export SHA1 hash, free hasher context.
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*/
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bool tr_sha1_final (tr_sha1_ctx_t handle,
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uint8_t * hash);
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/**
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* @brief Allocate and initialize new RC4 cipher context.
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*/
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tr_rc4_ctx_t tr_rc4_new (void);
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/**
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* @brief Free RC4 cipher context.
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*/
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void tr_rc4_free (tr_rc4_ctx_t handle);
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/**
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* @brief Set RC4 cipher key.
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*/
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void tr_rc4_set_key (tr_rc4_ctx_t handle,
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const uint8_t * key,
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size_t key_length);
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/**
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* @brief Process memory block with RC4 cipher.
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*/
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void tr_rc4_process (tr_rc4_ctx_t handle,
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const void * input,
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void * output,
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size_t length);
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/**
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* @brief Returns a random number in the range of [0...upper_bound).
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*/
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int tr_rand_int (int upper_bound);
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/**
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* @brief Returns a pseudorandom number in the range of [0...upper_bound).
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*
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* This is faster, BUT WEAKER, than tr_rand_int () and never be used in sensitive cases.
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* @see tr_rand_int ()
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*/
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int tr_rand_int_weak (int upper_bound);
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/**
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* @brief Fill a buffer with random bytes.
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*/
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bool tr_rand_buffer (void * buffer,
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size_t length);
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/** @} */
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#endif /* TR_CRYPTO_UTILS_H */
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