-/* random.c
- *
- * Copyright (C) 2006-2014 wolfSSL Inc.
- *
- * This file is part of CyaSSL.
- *
- * CyaSSL is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * CyaSSL is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
- */
-
-#ifdef HAVE_CONFIG_H
- #include <config.h>
-#endif
-
-#include <cyassl/ctaocrypt/settings.h>
-
-/* on HPUX 11 you may need to install /dev/random see
- http://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=KRNG11I
-
-*/
-
-#ifdef HAVE_FIPS
- /* set NO_WRAPPERS before headers, use direct internal f()s not wrappers */
- #define FIPS_NO_WRAPPERS
-#endif
-
-#include <cyassl/ctaocrypt/random.h>
-#include <cyassl/ctaocrypt/error-crypt.h>
-
-#if defined(HAVE_HASHDRBG) || defined(NO_RC4)
-
- #include <cyassl/ctaocrypt/sha256.h>
-
- #ifdef NO_INLINE
- #include <cyassl/ctaocrypt/misc.h>
- #else
- #include <ctaocrypt/src/misc.c>
- #endif
-#endif /* HAVE_HASHDRBG || NO_RC4 */
-
-#if defined(USE_WINDOWS_API)
- #ifndef _WIN32_WINNT
- #define _WIN32_WINNT 0x0400
- #endif
- #include <windows.h>
- #include <wincrypt.h>
-#else
- #if !defined(NO_DEV_RANDOM) && !defined(CYASSL_MDK_ARM) \
- && !defined(CYASSL_IAR_ARM)
- #include <fcntl.h>
- #ifndef EBSNET
- #include <unistd.h>
- #endif
- #else
- /* include headers that may be needed to get good seed */
- #endif
-#endif /* USE_WINDOWS_API */
-
-
-#if defined(HAVE_HASHDRBG) || defined(NO_RC4)
-
-/* Start NIST DRBG code */
-
-#define OUTPUT_BLOCK_LEN (SHA256_DIGEST_SIZE)
-#define MAX_REQUEST_LEN (0x10000)
-#define RESEED_INTERVAL (1000000)
-#define SECURITY_STRENGTH (256)
-#define ENTROPY_SZ (SECURITY_STRENGTH/8)
-#define NONCE_SZ (ENTROPY_SZ/2)
-#define ENTROPY_NONCE_SZ (ENTROPY_SZ+NONCE_SZ)
-
-/* Internal return codes */
-#define DRBG_SUCCESS 0
-#define DRBG_ERROR 1
-#define DRBG_FAILURE 2
-#define DRBG_NEED_RESEED 3
-
-/* RNG health states */
-#define DRBG_NOT_INIT 0
-#define DRBG_OK 1
-#define DRBG_FAILED 2
-
-
-enum {
- drbgInitC = 0,
- drbgReseed = 1,
- drbgGenerateW = 2,
- drbgGenerateH = 3,
- drbgInitV
-};
-
-
-/* Hash Derivation Function */
-/* Returns: DRBG_SUCCESS or DRBG_FAILURE */
-static int Hash_df(RNG* rng, byte* out, word32 outSz, byte type,
- const byte* inA, word32 inASz,
- const byte* inB, word32 inBSz)
-{
- byte ctr;
- int i;
- int len;
- word32 bits = (outSz * 8); /* reverse byte order */
-
- #ifdef LITTLE_ENDIAN_ORDER
- bits = ByteReverseWord32(bits);
- #endif
- len = (outSz / OUTPUT_BLOCK_LEN)
- + ((outSz % OUTPUT_BLOCK_LEN) ? 1 : 0);
-
- for (i = 0, ctr = 1; i < len; i++, ctr++)
- {
- if (InitSha256(&rng->sha) != 0)
- return DRBG_FAILURE;
-
- if (Sha256Update(&rng->sha, &ctr, sizeof(ctr)) != 0)
- return DRBG_FAILURE;
-
- if (Sha256Update(&rng->sha, (byte*)&bits, sizeof(bits)) != 0)
- return DRBG_FAILURE;
-
- /* churning V is the only string that doesn't have
- * the type added */
- if (type != drbgInitV)
- if (Sha256Update(&rng->sha, &type, sizeof(type)) != 0)
- return DRBG_FAILURE;
-
- if (Sha256Update(&rng->sha, inA, inASz) != 0)
- return DRBG_FAILURE;
-
- if (inB != NULL && inBSz > 0)
- if (Sha256Update(&rng->sha, inB, inBSz) != 0)
- return DRBG_FAILURE;
-
- if (Sha256Final(&rng->sha, rng->digest) != 0)
- return DRBG_FAILURE;
-
- if (outSz > OUTPUT_BLOCK_LEN) {
- XMEMCPY(out, rng->digest, OUTPUT_BLOCK_LEN);
- outSz -= OUTPUT_BLOCK_LEN;
- out += OUTPUT_BLOCK_LEN;
- }
- else {
- XMEMCPY(out, rng->digest, outSz);
- }
- }
-
- return DRBG_SUCCESS;
-}
-
-
-/* Returns: DRBG_SUCCESS or DRBG_FAILURE */
-static int Hash_DRBG_Reseed(RNG* rng, const byte* entropy, word32 entropySz)
-{
- byte seed[DRBG_SEED_LEN];
-
- if (Hash_df(rng, seed, sizeof(seed), drbgReseed, rng->V, sizeof(rng->V),
- entropy, entropySz) != DRBG_SUCCESS) {
- return DRBG_FAILURE;
- }
-
- XMEMCPY(rng->V, seed, sizeof(rng->V));
- XMEMSET(seed, 0, sizeof(seed));
-
- if (Hash_df(rng, rng->C, sizeof(rng->C), drbgInitC, rng->V,
- sizeof(rng->V), NULL, 0) != DRBG_SUCCESS) {
- return DRBG_FAILURE;
- }
-
- rng->reseedCtr = 1;
- return DRBG_SUCCESS;
-}
-
-static INLINE void array_add_one(byte* data, word32 dataSz)
-{
- int i;
-
- for (i = dataSz - 1; i >= 0; i--)
- {
- data[i]++;
- if (data[i] != 0) break;
- }
-}
-
-
-/* Returns: DRBG_SUCCESS or DRBG_FAILURE */
-static int Hash_gen(RNG* rng, byte* out, word32 outSz, const byte* V)
-{
- byte data[DRBG_SEED_LEN];
- int i;
- int len = (outSz / OUTPUT_BLOCK_LEN)
- + ((outSz % OUTPUT_BLOCK_LEN) ? 1 : 0);
-
- XMEMCPY(data, V, sizeof(data));
- for (i = 0; i < len; i++) {
- if (InitSha256(&rng->sha) != 0 ||
- Sha256Update(&rng->sha, data, sizeof(data)) != 0 ||
- Sha256Final(&rng->sha, rng->digest) != 0) {
-
- return DRBG_FAILURE;
- }
-
- if (outSz > OUTPUT_BLOCK_LEN) {
- XMEMCPY(out, rng->digest, OUTPUT_BLOCK_LEN);
- outSz -= OUTPUT_BLOCK_LEN;
- out += OUTPUT_BLOCK_LEN;
- array_add_one(data, DRBG_SEED_LEN);
- }
- else {
- XMEMCPY(out, rng->digest, outSz);
- }
- }
- XMEMSET(data, 0, sizeof(data));
-
- return DRBG_SUCCESS;
-}
-
-
-static INLINE void array_add(byte* d, word32 dLen, const byte* s, word32 sLen)
-{
- word16 carry = 0;
-
- if (dLen > 0 && sLen > 0 && dLen >= sLen) {
- int sIdx, dIdx;
-
- for (sIdx = sLen - 1, dIdx = dLen - 1; sIdx >= 0; dIdx--, sIdx--)
- {
- carry += d[dIdx] + s[sIdx];
- d[dIdx] = carry;
- carry >>= 8;
- }
- if (dIdx > 0)
- d[dIdx] += carry;
- }
-}
-
-
-/* Returns: DRBG_SUCCESS, DRBG_NEED_RESEED, or DRBG_FAILURE */
-static int Hash_DRBG_Generate(RNG* rng, byte* out, word32 outSz)
-{
- int ret = DRBG_NEED_RESEED;
-
- if (rng->reseedCtr != RESEED_INTERVAL) {
- byte type = drbgGenerateH;
- word32 reseedCtr = rng->reseedCtr;
-
- rng->reseedCtr++;
- if (Hash_gen(rng, out, outSz, rng->V) != 0 ||
- InitSha256(&rng->sha) != 0 ||
- Sha256Update(&rng->sha, &type, sizeof(type)) != 0 ||
- Sha256Update(&rng->sha, rng->V, sizeof(rng->V)) != 0 ||
- Sha256Final(&rng->sha, rng->digest) != 0) {
-
- ret = DRBG_FAILURE;
- }
- else {
- array_add(rng->V, sizeof(rng->V), rng->digest, sizeof(rng->digest));
- array_add(rng->V, sizeof(rng->V), rng->C, sizeof(rng->C));
- #ifdef LITTLE_ENDIAN_ORDER
- reseedCtr = ByteReverseWord32(reseedCtr);
- #endif
- array_add(rng->V, sizeof(rng->V),
- (byte*)&reseedCtr, sizeof(reseedCtr));
- ret = DRBG_SUCCESS;
- }
- }
-
- return ret;
-}
-
-
-/* Returns: DRBG_SUCCESS or DRBG_FAILURE */
-static int Hash_DRBG_Instantiate(RNG* rng, const byte* seed, word32 seedSz,
- const byte* nonce, word32 nonceSz)
-{
- int ret = DRBG_FAILURE;
-
- XMEMSET(rng, 0, sizeof(*rng));
-
- if (Hash_df(rng, rng->V, sizeof(rng->V), drbgInitV, seed, seedSz,
- nonce, nonceSz) == DRBG_SUCCESS &&
- Hash_df(rng, rng->C, sizeof(rng->C), drbgInitC, rng->V,
- sizeof(rng->V), NULL, 0) == DRBG_SUCCESS) {
-
- rng->reseedCtr = 1;
- ret = DRBG_SUCCESS;
- }
-
- return ret;
-}
-
-
-/* Returns: DRBG_SUCCESS */
-static int Hash_DRBG_Uninstantiate(RNG* rng)
-{
- XMEMSET(rng, 0, sizeof(*rng));
-
- return DRBG_SUCCESS;
-}
-
-/* End NIST DRBG Code */
-
-
-/* Get seed and key cipher */
-int InitRng(RNG* rng)
-{
- int ret = BAD_FUNC_ARG;
-
- if (rng != NULL) {
- byte entropy[ENTROPY_NONCE_SZ];
-
- /* This doesn't use a separate nonce. The entropy input will be
- * the default size plus the size of the nonce making the seed
- * size. */
- if (GenerateSeed(&rng->seed, entropy, ENTROPY_NONCE_SZ) == 0 &&
- Hash_DRBG_Instantiate(rng, entropy, ENTROPY_NONCE_SZ,
- NULL, 0) == DRBG_SUCCESS) {
- rng->status = DRBG_OK;
- ret = 0;
- }
- else {
- rng->status = DRBG_FAILED;
- ret = RNG_FAILURE_E;
- }
-
- XMEMSET(entropy, 0, ENTROPY_NONCE_SZ);
- }
-
- return ret;
-}
-
-
-/* place a generated block in output */
-int RNG_GenerateBlock(RNG* rng, byte* output, word32 sz)
-{
- int ret;
-
- if (rng == NULL || output == NULL || sz > MAX_REQUEST_LEN)
- return BAD_FUNC_ARG;
-
- if (rng->status != DRBG_OK)
- return RNG_FAILURE_E;
-
- ret = Hash_DRBG_Generate(rng, output, sz);
- if (ret == DRBG_SUCCESS) {
- ret = 0;
- }
- else if (ret == DRBG_NEED_RESEED) {
- byte entropy[ENTROPY_SZ];
-
- if (GenerateSeed(&rng->seed, entropy, ENTROPY_SZ) == 0 &&
- Hash_DRBG_Reseed(rng, entropy, ENTROPY_SZ) == DRBG_SUCCESS &&
- Hash_DRBG_Generate(rng, output, sz) == DRBG_SUCCESS) {
-
- ret = 0;
- }
- else {
- ret = RNG_FAILURE_E;
- rng->status = DRBG_FAILED;
- }
-
- XMEMSET(entropy, 0, ENTROPY_SZ);
- }
- else {
- ret = RNG_FAILURE_E;
- rng->status = DRBG_FAILED;
- }
-
- return ret;
-}
-
-
-int RNG_GenerateByte(RNG* rng, byte* b)
-{
- return RNG_GenerateBlock(rng, b, 1);
-}
-
-
-int FreeRng(RNG* rng)
-{
- int ret = BAD_FUNC_ARG;
-
- if (rng != NULL) {
- if (Hash_DRBG_Uninstantiate(rng) == DRBG_SUCCESS)
- ret = 0;
- else
- ret = RNG_FAILURE_E;
- }
-
- return ret;
-}
-
-
-int RNG_HealthTest(int reseed, const byte* entropyA, word32 entropyASz,
- const byte* entropyB, word32 entropyBSz,
- const byte* output, word32 outputSz)
-{
- RNG rng;
- byte check[SHA256_DIGEST_SIZE * 4];
-
- if (Hash_DRBG_Instantiate(&rng, entropyA, entropyASz, NULL, 0) != 0)
- return -1;
-
- if (reseed) {
- if (Hash_DRBG_Reseed(&rng, entropyB, entropyBSz) != 0) {
- Hash_DRBG_Uninstantiate(&rng);
- return -1;
- }
- }
-
- if (Hash_DRBG_Generate(&rng, check, sizeof(check)) != 0) {
- Hash_DRBG_Uninstantiate(&rng);
- return -1;
- }
-
- if (Hash_DRBG_Generate(&rng, check, sizeof(check)) != 0) {
- Hash_DRBG_Uninstantiate(&rng);
- return -1;
- }
-
- if (outputSz != sizeof(check) || XMEMCMP(output, check, sizeof(check))) {
- Hash_DRBG_Uninstantiate(&rng);
- return -1;
- }
-
- Hash_DRBG_Uninstantiate(&rng);
-
- return 0;
-}
-
-
-#else /* HAVE_HASHDRBG || NO_RC4 */
-
-/* Get seed and key cipher */
-int InitRng(RNG* rng)
-{
- int ret;
-#ifdef CYASSL_SMALL_STACK
- byte* key;
- byte* junk;
-#else
- byte key[32];
- byte junk[256];
-#endif
-
-#ifdef HAVE_CAVIUM
- if (rng->magic == CYASSL_RNG_CAVIUM_MAGIC)
- return 0;
-#endif
-
-#ifdef CYASSL_SMALL_STACK
- key = (byte*)XMALLOC(32, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- if (key == NULL)
- return MEMORY_E;
-
- junk = (byte*)XMALLOC(256, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- if (junk == NULL) {
- XFREE(key, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- return MEMORY_E;
- }
-#endif
-
- ret = GenerateSeed(&rng->seed, key, 32);
-
- if (ret == 0) {
- Arc4SetKey(&rng->cipher, key, sizeof(key));
-
- ret = RNG_GenerateBlock(rng, junk, 256); /*rid initial state*/
- }
-
-#ifdef CYASSL_SMALL_STACK
- XFREE(key, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- XFREE(junk, NULL, DYNAMIC_TYPE_TMP_BUFFER);
-#endif
-
- return ret;
-}
-
-#ifdef HAVE_CAVIUM
- static void CaviumRNG_GenerateBlock(RNG* rng, byte* output, word32 sz);
-#endif
-
-/* place a generated block in output */
-int RNG_GenerateBlock(RNG* rng, byte* output, word32 sz)
-{
-#ifdef HAVE_CAVIUM
- if (rng->magic == CYASSL_RNG_CAVIUM_MAGIC)
- return CaviumRNG_GenerateBlock(rng, output, sz);
-#endif
- XMEMSET(output, 0, sz);
- Arc4Process(&rng->cipher, output, output, sz);
-
- return 0;
-}
-
-
-int RNG_GenerateByte(RNG* rng, byte* b)
-{
- return RNG_GenerateBlock(rng, b, 1);
-}
-
-
-#ifdef HAVE_CAVIUM
-
-#include <cyassl/ctaocrypt/logging.h>
-#include "cavium_common.h"
-
-/* Initiliaze RNG for use with Nitrox device */
-int InitRngCavium(RNG* rng, int devId)
-{
- if (rng == NULL)
- return -1;
-
- rng->devId = devId;
- rng->magic = CYASSL_RNG_CAVIUM_MAGIC;
-
- return 0;
-}
-
-
-static void CaviumRNG_GenerateBlock(RNG* rng, byte* output, word32 sz)
-{
- word offset = 0;
- word32 requestId;
-
- while (sz > CYASSL_MAX_16BIT) {
- word16 slen = (word16)CYASSL_MAX_16BIT;
- if (CspRandom(CAVIUM_BLOCKING, slen, output + offset, &requestId,
- rng->devId) != 0) {
- CYASSL_MSG("Cavium RNG failed");
- }
- sz -= CYASSL_MAX_16BIT;
- offset += CYASSL_MAX_16BIT;
- }
- if (sz) {
- word16 slen = (word16)sz;
- if (CspRandom(CAVIUM_BLOCKING, slen, output + offset, &requestId,
- rng->devId) != 0) {
- CYASSL_MSG("Cavium RNG failed");
- }
- }
-}
-
-#endif /* HAVE_CAVIUM */
-
-#endif /* HAVE_HASHDRBG || NO_RC4 */
-
-
-#if defined(USE_WINDOWS_API)
-
-
-int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
-{
- if(!CryptAcquireContext(&os->handle, 0, 0, PROV_RSA_FULL,
- CRYPT_VERIFYCONTEXT))
- return WINCRYPT_E;
-
- if (!CryptGenRandom(os->handle, sz, output))
- return CRYPTGEN_E;
-
- CryptReleaseContext(os->handle, 0);
-
- return 0;
-}
-
-
-#elif defined(HAVE_RTP_SYS) || defined(EBSNET)
-
-#include "rtprand.h" /* rtp_rand () */
-#include "rtptime.h" /* rtp_get_system_msec() */
-
-
-int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
-{
- int i;
- rtp_srand(rtp_get_system_msec());
-
- for (i = 0; i < sz; i++ ) {
- output[i] = rtp_rand() % 256;
- if ( (i % 8) == 7)
- rtp_srand(rtp_get_system_msec());
- }
-
- return 0;
-}
-
-
-#elif defined(MICRIUM)
-
-int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
-{
- #if (NET_SECURE_MGR_CFG_EN == DEF_ENABLED)
- NetSecure_InitSeed(output, sz);
- #endif
- return 0;
-}
-
-#elif defined(MBED)
-
-/* write a real one !!!, just for testing board */
-int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
-{
- int i;
- for (i = 0; i < sz; i++ )
- output[i] = i;
-
- return 0;
-}
-
-#elif defined(MICROCHIP_PIC32)
-
-#ifdef MICROCHIP_MPLAB_HARMONY
- #define PIC32_SEED_COUNT _CP0_GET_COUNT
-#else
- #if !defined(CYASSL_MICROCHIP_PIC32MZ)
- #include <peripheral/timer.h>
- #endif
- #define PIC32_SEED_COUNT ReadCoreTimer
-#endif
- #ifdef CYASSL_MIC32MZ_RNG
- #include "xc.h"
- int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i ;
- byte rnd[8] ;
- word32 *rnd32 = (word32 *)rnd ;
- word32 size = sz ;
- byte* op = output ;
-
- /* This part has to be replaced with better random seed */
- RNGNUMGEN1 = ReadCoreTimer();
- RNGPOLY1 = ReadCoreTimer();
- RNGPOLY2 = ReadCoreTimer();
- RNGNUMGEN2 = ReadCoreTimer();
-#ifdef DEBUG_CYASSL
- printf("GenerateSeed::Seed=%08x, %08x\n", RNGNUMGEN1, RNGNUMGEN2) ;
-#endif
- RNGCONbits.PLEN = 0x40;
- RNGCONbits.PRNGEN = 1;
- for(i=0; i<5; i++) { /* wait for RNGNUMGEN ready */
- volatile int x ;
- x = RNGNUMGEN1 ;
- x = RNGNUMGEN2 ;
- }
- do {
- rnd32[0] = RNGNUMGEN1;
- rnd32[1] = RNGNUMGEN2;
-
- for(i=0; i<8; i++, op++) {
- *op = rnd[i] ;
- size -- ;
- if(size==0)break ;
- }
- } while(size) ;
- return 0;
- }
- #else /* CYASSL_MIC32MZ_RNG */
- /* uses the core timer, in nanoseconds to seed srand */
- int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
- srand(PIC32_SEED_COUNT() * 25);
-
- for (i = 0; i < sz; i++ ) {
- output[i] = rand() % 256;
- if ( (i % 8) == 7)
- srand(PIC32_SEED_COUNT() * 25);
- }
- return 0;
- }
- #endif /* CYASSL_MIC32MZ_RNG */
-
-#elif defined(FREESCALE_MQX)
-
- #ifdef FREESCALE_K70_RNGA
- /*
- * Generates a RNG seed using the Random Number Generator Accelerator
- * on the Kinetis K70. Documentation located in Chapter 37 of
- * K70 Sub-Family Reference Manual (see Note 3 in the README for link).
- */
- int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
-
- /* turn on RNGA module */
- SIM_SCGC3 |= SIM_SCGC3_RNGA_MASK;
-
- /* set SLP bit to 0 - "RNGA is not in sleep mode" */
- RNG_CR &= ~RNG_CR_SLP_MASK;
-
- /* set HA bit to 1 - "security violations masked" */
- RNG_CR |= RNG_CR_HA_MASK;
-
- /* set GO bit to 1 - "output register loaded with data" */
- RNG_CR |= RNG_CR_GO_MASK;
-
- for (i = 0; i < sz; i++) {
-
- /* wait for RNG FIFO to be full */
- while((RNG_SR & RNG_SR_OREG_LVL(0xF)) == 0) {}
-
- /* get value */
- output[i] = RNG_OR;
- }
-
- return 0;
- }
-
- #elif defined(FREESCALE_K53_RNGB)
- /*
- * Generates a RNG seed using the Random Number Generator (RNGB)
- * on the Kinetis K53. Documentation located in Chapter 33 of
- * K53 Sub-Family Reference Manual (see note in the README for link).
- */
- int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
-
- /* turn on RNGB module */
- SIM_SCGC3 |= SIM_SCGC3_RNGB_MASK;
-
- /* reset RNGB */
- RNG_CMD |= RNG_CMD_SR_MASK;
-
- /* FIFO generate interrupt, return all zeros on underflow,
- * set auto reseed */
- RNG_CR |= (RNG_CR_FUFMOD_MASK | RNG_CR_AR_MASK);
-
- /* gen seed, clear interrupts, clear errors */
- RNG_CMD |= (RNG_CMD_GS_MASK | RNG_CMD_CI_MASK | RNG_CMD_CE_MASK);
-
- /* wait for seeding to complete */
- while ((RNG_SR & RNG_SR_SDN_MASK) == 0) {}
-
- for (i = 0; i < sz; i++) {
-
- /* wait for a word to be available from FIFO */
- while((RNG_SR & RNG_SR_FIFO_LVL_MASK) == 0) {}
-
- /* get value */
- output[i] = RNG_OUT;
- }
-
- return 0;
- }
-
- #else
- #warning "write a real random seed!!!!, just for testing now"
-
- int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
- for (i = 0; i < sz; i++ )
- output[i] = i;
-
- return 0;
- }
- #endif /* FREESCALE_K70_RNGA */
-
-#elif defined(CYASSL_SAFERTOS) || defined(CYASSL_LEANPSK) \
- || defined(CYASSL_IAR_ARM) || defined(CYASSL_MDK_ARM)
-
-#warning "write a real random seed!!!!, just for testing now"
-
-int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
-{
- word32 i;
- for (i = 0; i < sz; i++ )
- output[i] = i;
-
- (void)os;
-
- return 0;
-}
-
-#elif defined(STM32F2_RNG)
- #undef RNG
- #include "stm32f2xx_rng.h"
- #include "stm32f2xx_rcc.h"
- /*
- * Generate a RNG seed using the hardware random number generator
- * on the STM32F2. Documentation located in STM32F2xx Standard Peripheral
- * Library document (See note in README).
- */
- int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
-
- /* enable RNG clock source */
- RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_RNG, ENABLE);
-
- /* enable RNG peripheral */
- RNG_Cmd(ENABLE);
-
- for (i = 0; i < sz; i++) {
- /* wait until RNG number is ready */
- while(RNG_GetFlagStatus(RNG_FLAG_DRDY)== RESET) { }
-
- /* get value */
- output[i] = RNG_GetRandomNumber();
- }
-
- return 0;
- }
-#elif defined(CYASSL_LPC43xx) || defined(CYASSL_STM32F2xx)
-
- #warning "write a real random seed!!!!, just for testing now"
-
- int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
-
- for (i = 0; i < sz; i++ )
- output[i] = i;
-
- return 0;
- }
-
-#elif defined(CUSTOM_RAND_GENERATE)
-
- /* Implement your own random generation function
- * word32 rand_gen(void);
- * #define CUSTOM_RAND_GENERATE rand_gen */
-
- int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
-
- for (i = 0; i < sz; i++ )
- output[i] = CUSTOM_RAND_GENERATE();
-
- return 0;
- }
-
-#elif defined(NO_DEV_RANDOM)
-
-#error "you need to write an os specific GenerateSeed() here"
-
-/*
-int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
-{
- return 0;
-}
-*/
-
-
-#else /* !USE_WINDOWS_API && !HAVE_RPT_SYS && !MICRIUM && !NO_DEV_RANDOM */
-
-
-/* may block */
-int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
-{
- int ret = 0;
-
- os->fd = open("/dev/urandom",O_RDONLY);
- if (os->fd == -1) {
- /* may still have /dev/random */
- os->fd = open("/dev/random",O_RDONLY);
- if (os->fd == -1)
- return OPEN_RAN_E;
- }
-
- while (sz) {
- int len = (int)read(os->fd, output, sz);
- if (len == -1) {
- ret = READ_RAN_E;
- break;
- }
-
- sz -= len;
- output += len;
-
- if (sz) {
-#ifdef BLOCKING
- sleep(0); /* context switch */
-#else
- ret = RAN_BLOCK_E;
- break;
-#endif
- }
- }
- close(os->fd);
-
- return ret;
-}
-
-#endif /* USE_WINDOWS_API */
-
+/* dummy file for autoconf */
projects / freertos / blobdiff