| /* 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 */ |
| |
