mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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194 lines
4 KiB
C
194 lines
4 KiB
C
/* random.c
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*
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* Copyright (C) 2006-2012 Sawtooth Consulting Ltd.
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*
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* This file is part of CyaSSL.
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*
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* CyaSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* CyaSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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/* on HPUX 11 you may need to install /dev/random see
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http://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=KRNG11I
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*/
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#include <cyassl/ctaocrypt/random.h>
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#include <cyassl/ctaocrypt/error.h>
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#if defined(USE_WINDOWS_API)
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#ifndef _WIN32_WINNT
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#define _WIN32_WINNT 0x0400
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#endif
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#include <windows.h>
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#include <wincrypt.h>
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#else
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#ifndef NO_DEV_RANDOM
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#include <fcntl.h>
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#include <unistd.h>
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#else
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/* include headers that may be needed to get good seed */
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#endif
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#endif /* USE_WINDOWS_API */
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/* Get seed and key cipher */
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int InitRng(RNG* rng)
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{
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byte key[32];
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byte junk[256];
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int ret = GenerateSeed(&rng->seed, key, sizeof(key));
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if (ret == 0) {
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Arc4SetKey(&rng->cipher, key, sizeof(key));
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RNG_GenerateBlock(rng, junk, sizeof(junk)); /* rid initial state */
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}
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return ret;
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}
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/* place a generated block in output */
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void RNG_GenerateBlock(RNG* rng, byte* output, word32 sz)
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{
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XMEMSET(output, 0, sz);
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Arc4Process(&rng->cipher, output, output, sz);
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}
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byte RNG_GenerateByte(RNG* rng)
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{
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byte b;
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RNG_GenerateBlock(rng, &b, 1);
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return b;
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}
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#if defined(USE_WINDOWS_API)
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int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
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{
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if(!CryptAcquireContext(&os->handle, 0, 0, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT))
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return WINCRYPT_E;
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if (!CryptGenRandom(os->handle, sz, output))
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return CRYPTGEN_E;
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CryptReleaseContext(os->handle, 0);
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return 0;
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}
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#elif defined(THREADX)
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#include "rtprand.h" /* rtp_rand () */
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#include "rtptime.h" /* rtp_get_system_msec() */
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int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
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{
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int i;
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rtp_srand(rtp_get_system_msec());
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for (i = 0; i < sz; i++ ) {
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output[i] = rtp_rand() % 256;
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if ( (i % 8) == 7)
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rtp_srand(rtp_get_system_msec());
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}
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return 0;
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}
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#elif defined(MICRIUM)
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int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
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{
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#if (NET_SECURE_MGR_CFG_EN == DEF_ENABLED)
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NetSecure_InitSeed(output, sz);
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#endif
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return 0;
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}
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#elif defined(MBED)
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/* write a real one !!!, just for testing board */
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int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
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{
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int i;
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for (i = 0; i < sz; i++ )
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output[i] = i;
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return 0;
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}
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#elif defined(NO_DEV_RANDOM)
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#error "you need to write an os specific GenerateSeed() here"
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#else /* !USE_WINDOWS_API && !THREADX && !MICRIUM && !NO_DEV_RANDOM */
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/* may block */
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int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
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{
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int ret = 0;
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os->fd = open("/dev/urandom",O_RDONLY);
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if (os->fd == -1) {
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/* may still have /dev/random */
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os->fd = open("/dev/random",O_RDONLY);
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if (os->fd == -1)
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return OPEN_RAN_E;
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}
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while (sz) {
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int len = read(os->fd, output, sz);
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if (len == -1) {
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ret = READ_RAN_E;
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break;
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}
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sz -= len;
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output += len;
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if (sz) {
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#ifdef BLOCKING
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sleep(0); /* context switch */
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#else
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ret = RAN_BLOCK_E;
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break;
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#endif
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}
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}
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close(os->fd);
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return ret;
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}
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#endif /* USE_WINDOWS_API */
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