322 lines
6.2 KiB
C
322 lines
6.2 KiB
C
/*
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* This file Copyright (C) 2014-2015 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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#include <assert.h>
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#include <polarssl/arc4.h>
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#include <polarssl/base64.h>
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#include <polarssl/ctr_drbg.h>
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#include <polarssl/dhm.h>
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#include <polarssl/error.h>
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#include <polarssl/sha1.h>
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#include <polarssl/version.h>
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#include "transmission.h"
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#include "crypto-utils.h"
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#include "log.h"
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#include "platform.h"
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#include "utils.h"
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#define TR_CRYPTO_DH_SECRET_FALLBACK
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#include "crypto-utils-fallback.c"
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/***
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****
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***/
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#define MY_NAME "tr_crypto_utils"
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static void
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log_polarssl_error (int error_code,
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const char * file,
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int line)
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{
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if (tr_logLevelIsActive (TR_LOG_ERROR))
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{
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char error_message[256];
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polarssl_strerror (error_code, error_message, sizeof (error_message));
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tr_logAddMessage (file, line, TR_LOG_ERROR, MY_NAME, "PolarSSL error: %s", error_message);
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}
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}
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#define log_error(error_code) log_polarssl_error(error_code, __FILE__, __LINE__)
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static bool
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check_polarssl_result (int result,
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int expected_result,
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const char * file,
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int line)
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{
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const bool ret = result == expected_result;
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if (!ret)
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log_polarssl_error (result, file, line);
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return ret;
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}
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#define check_result(result) check_polarssl_result ((result), 0, __FILE__, __LINE__)
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#define check_result_eq(result, x_result) check_polarssl_result ((result), (x_result), __FILE__, __LINE__)
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/***
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****
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***/
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static int
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my_rand (void * context UNUSED, unsigned char * buffer, size_t buffer_size)
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{
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size_t i;
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for (i = 0; i < buffer_size; ++i)
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buffer[i] = tr_rand_int_weak (256);
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return 0;
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}
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static ctr_drbg_context *
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get_rng (void)
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{
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static ctr_drbg_context rng;
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static bool rng_initialized = false;
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if (!rng_initialized)
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{
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if (!check_result (ctr_drbg_init (&rng, &my_rand, NULL, NULL, 0)))
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return NULL;
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rng_initialized = true;
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}
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return &rng;
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}
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static tr_lock *
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get_rng_lock (void)
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{
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static tr_lock * lock = NULL;
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if (lock == NULL)
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lock = tr_lockNew ();
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return lock;
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}
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/***
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****
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***/
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tr_sha1_ctx_t
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tr_sha1_init (void)
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{
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sha1_context * handle = tr_new0 (sha1_context, 1);
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#if POLARSSL_VERSION_NUMBER >= 0x01030800
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sha1_init (handle);
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#endif
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sha1_starts (handle);
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return handle;
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}
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bool
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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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assert (handle != NULL);
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if (data_length == 0)
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return true;
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assert (data != NULL);
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sha1_update (handle, data, data_length);
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return true;
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}
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bool
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tr_sha1_final (tr_sha1_ctx_t handle,
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uint8_t * hash)
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{
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if (hash != NULL)
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{
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assert (handle != NULL);
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sha1_finish (handle, hash);
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}
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#if POLARSSL_VERSION_NUMBER >= 0x01030800
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sha1_free (handle);
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#endif
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tr_free (handle);
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return true;
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}
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/***
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****
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***/
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tr_rc4_ctx_t
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tr_rc4_new (void)
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{
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arc4_context * handle = tr_new0 (arc4_context, 1);
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#if POLARSSL_VERSION_NUMBER >= 0x01030800
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arc4_init (handle);
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#endif
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return handle;
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}
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void
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tr_rc4_free (tr_rc4_ctx_t handle)
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{
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#if POLARSSL_VERSION_NUMBER >= 0x01030800
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arc4_free (handle);
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#endif
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tr_free (handle);
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}
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void
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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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assert (handle != NULL);
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assert (key != NULL);
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arc4_setup (handle, key, key_length);
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}
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void
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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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assert (handle != NULL);
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if (length == 0)
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return;
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assert (input != NULL);
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assert (output != NULL);
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arc4_crypt (handle, length, input, output);
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}
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/***
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****
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***/
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tr_dh_ctx_t
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tr_dh_new (const uint8_t * prime_num,
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size_t prime_num_length,
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const uint8_t * generator_num,
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size_t generator_num_length)
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{
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dhm_context * handle = tr_new0 (dhm_context, 1);
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assert (prime_num != NULL);
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assert (generator_num != NULL);
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#if POLARSSL_VERSION_NUMBER >= 0x01030800
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dhm_init (handle);
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#endif
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if (!check_result (mpi_read_binary (&handle->P, prime_num, prime_num_length)) ||
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!check_result (mpi_read_binary (&handle->G, generator_num, generator_num_length)))
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{
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dhm_free (handle);
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return NULL;
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}
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handle->len = prime_num_length;
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return handle;
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}
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void
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tr_dh_free (tr_dh_ctx_t handle)
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{
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if (handle == NULL)
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return;
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dhm_free (handle);
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}
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bool
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tr_dh_make_key (tr_dh_ctx_t raw_handle,
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size_t private_key_length,
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uint8_t * public_key,
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size_t * public_key_length)
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{
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dhm_context * handle = raw_handle;
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assert (handle != NULL);
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assert (public_key != NULL);
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if (public_key_length != NULL)
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*public_key_length = handle->len;
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return check_result (dhm_make_public (handle, private_key_length, public_key,
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handle->len, my_rand, NULL));
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}
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tr_dh_secret_t
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tr_dh_agree (tr_dh_ctx_t raw_handle,
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const uint8_t * other_public_key,
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size_t other_public_key_length)
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{
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dhm_context * handle = raw_handle;
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struct tr_dh_secret * ret;
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size_t secret_key_length;
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assert (handle != NULL);
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assert (other_public_key != NULL);
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if (!check_result (dhm_read_public (handle, other_public_key,
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other_public_key_length)))
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return NULL;
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ret = tr_dh_secret_new (handle->len);
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secret_key_length = handle->len;
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if (!check_result (dhm_calc_secret (handle, ret->key,
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&secret_key_length, my_rand, NULL)))
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{
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tr_dh_secret_free (ret);
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return NULL;
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}
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tr_dh_secret_align (ret, secret_key_length);
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return ret;
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}
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/***
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****
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***/
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bool
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tr_rand_buffer (void * buffer,
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size_t length)
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{
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bool ret;
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tr_lock * rng_lock = get_rng_lock ();
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assert (buffer != NULL);
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tr_lockLock (rng_lock);
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ret = check_result (ctr_drbg_random (get_rng (), buffer, length));
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tr_lockUnlock (rng_lock);
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return ret;
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}
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