A library for setting up Secure Socket Layer (SSL) connections and verifying remote hosts using certificates. Contains only the source files for mbed platform implementation of the library.
Dependents: HTTPClient-SSL HTTPClient-SSL HTTPClient-SSL HTTPClient-SSL
ctaocrypt/src/random.c
- Committer:
- Mike Fiore
- Date:
- 2015-03-23
- Revision:
- 6:cf58d49e1a86
- Parent:
- 0:b86d15c6ba29
File content as of revision 6:cf58d49e1a86:
/* 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 #define DRBG_CONT_FAILURE 4 /* RNG health states */ #define DRBG_NOT_INIT 0 #define DRBG_OK 1 #define DRBG_FAILED 2 #define DRBG_CONT_FAILED 3 enum { drbgInitC = 0, drbgReseed = 1, drbgGenerateW = 2, drbgGenerateH = 3, drbgInitV }; typedef struct DRBG { Sha256 sha; byte digest[SHA256_DIGEST_SIZE]; byte V[DRBG_SEED_LEN]; byte C[DRBG_SEED_LEN]; word32 reseedCtr; word32 lastBlock; byte matchCount; } DRBG; /* Hash Derivation Function */ /* Returns: DRBG_SUCCESS or DRBG_FAILURE */ static int Hash_df(DRBG* drbg, 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(&drbg->sha) != 0) return DRBG_FAILURE; if (Sha256Update(&drbg->sha, &ctr, sizeof(ctr)) != 0) return DRBG_FAILURE; if (Sha256Update(&drbg->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(&drbg->sha, &type, sizeof(type)) != 0) return DRBG_FAILURE; if (Sha256Update(&drbg->sha, inA, inASz) != 0) return DRBG_FAILURE; if (inB != NULL && inBSz > 0) if (Sha256Update(&drbg->sha, inB, inBSz) != 0) return DRBG_FAILURE; if (Sha256Final(&drbg->sha, drbg->digest) != 0) return DRBG_FAILURE; if (outSz > OUTPUT_BLOCK_LEN) { XMEMCPY(out, drbg->digest, OUTPUT_BLOCK_LEN); outSz -= OUTPUT_BLOCK_LEN; out += OUTPUT_BLOCK_LEN; } else { XMEMCPY(out, drbg->digest, outSz); } } return DRBG_SUCCESS; } /* Returns: DRBG_SUCCESS or DRBG_FAILURE */ static int Hash_DRBG_Reseed(DRBG* drbg, const byte* entropy, word32 entropySz) { byte seed[DRBG_SEED_LEN]; if (Hash_df(drbg, seed, sizeof(seed), drbgReseed, drbg->V, sizeof(drbg->V), entropy, entropySz) != DRBG_SUCCESS) { return DRBG_FAILURE; } XMEMCPY(drbg->V, seed, sizeof(drbg->V)); XMEMSET(seed, 0, sizeof(seed)); if (Hash_df(drbg, drbg->C, sizeof(drbg->C), drbgInitC, drbg->V, sizeof(drbg->V), NULL, 0) != DRBG_SUCCESS) { return DRBG_FAILURE; } drbg->reseedCtr = 1; drbg->lastBlock = 0; drbg->matchCount = 0; 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(DRBG* drbg, byte* out, word32 outSz, const byte* V) { byte data[DRBG_SEED_LEN]; int i; int len; word32 checkBlock; /* Special case: outSz is 0 and out is NULL. Generate a block to save for * the continuous test. */ if (outSz == 0) outSz = 1; len = (outSz / OUTPUT_BLOCK_LEN) + ((outSz % OUTPUT_BLOCK_LEN) ? 1 : 0); XMEMCPY(data, V, sizeof(data)); for (i = 0; i < len; i++) { if (InitSha256(&drbg->sha) != 0 || Sha256Update(&drbg->sha, data, sizeof(data)) != 0 || Sha256Final(&drbg->sha, drbg->digest) != 0) { return DRBG_FAILURE; } checkBlock = *(word32*)drbg->digest; if (drbg->reseedCtr > 1 && checkBlock == drbg->lastBlock) { if (drbg->matchCount == 1) { return DRBG_CONT_FAILURE; } else { if (i == len) { len++; } drbg->matchCount = 1; } } else { drbg->matchCount = 0; drbg->lastBlock = checkBlock; } if (outSz >= OUTPUT_BLOCK_LEN) { XMEMCPY(out, drbg->digest, OUTPUT_BLOCK_LEN); outSz -= OUTPUT_BLOCK_LEN; out += OUTPUT_BLOCK_LEN; array_add_one(data, DRBG_SEED_LEN); } else if (out != NULL && outSz != 0) { XMEMCPY(out, drbg->digest, outSz); outSz = 0; } } 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; } for (; carry != 0 && dIdx >= 0; dIdx--) { carry += d[dIdx]; d[dIdx] = carry; carry >>= 8; } } } /* Returns: DRBG_SUCCESS, DRBG_NEED_RESEED, or DRBG_FAILURE */ static int Hash_DRBG_Generate(DRBG* drbg, byte* out, word32 outSz) { int ret = DRBG_NEED_RESEED; if (drbg->reseedCtr != RESEED_INTERVAL) { byte type = drbgGenerateH; word32 reseedCtr = drbg->reseedCtr; ret = Hash_gen(drbg, out, outSz, drbg->V); if (ret == DRBG_SUCCESS) { if (InitSha256(&drbg->sha) != 0 || Sha256Update(&drbg->sha, &type, sizeof(type)) != 0 || Sha256Update(&drbg->sha, drbg->V, sizeof(drbg->V)) != 0 || Sha256Final(&drbg->sha, drbg->digest) != 0) { ret = DRBG_FAILURE; } else { array_add(drbg->V, sizeof(drbg->V), drbg->digest, sizeof(drbg->digest)); array_add(drbg->V, sizeof(drbg->V), drbg->C, sizeof(drbg->C)); #ifdef LITTLE_ENDIAN_ORDER reseedCtr = ByteReverseWord32(reseedCtr); #endif array_add(drbg->V, sizeof(drbg->V), (byte*)&reseedCtr, sizeof(reseedCtr)); ret = DRBG_SUCCESS; } drbg->reseedCtr++; } } return ret; } /* Returns: DRBG_SUCCESS or DRBG_FAILURE */ static int Hash_DRBG_Instantiate(DRBG* drbg, const byte* seed, word32 seedSz, const byte* nonce, word32 nonceSz) { int ret = DRBG_FAILURE; XMEMSET(drbg, 0, sizeof(DRBG)); if (Hash_df(drbg, drbg->V, sizeof(drbg->V), drbgInitV, seed, seedSz, nonce, nonceSz) == DRBG_SUCCESS && Hash_df(drbg, drbg->C, sizeof(drbg->C), drbgInitC, drbg->V, sizeof(drbg->V), NULL, 0) == DRBG_SUCCESS) { drbg->reseedCtr = 1; drbg->lastBlock = 0; drbg->matchCount = 0; ret = DRBG_SUCCESS; } return ret; } /* Returns: DRBG_SUCCESS */ static int Hash_DRBG_Uninstantiate(DRBG* drbg) { XMEMSET(drbg, 0, sizeof(DRBG)); 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]; rng->drbg = (struct DRBG*)XMALLOC(sizeof(DRBG), NULL, DYNAMIC_TYPE_RNG); if (rng->drbg == NULL) { ret = MEMORY_E; } /* 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. */ else if (GenerateSeed(&rng->seed, entropy, ENTROPY_NONCE_SZ) == 0 && Hash_DRBG_Instantiate(rng->drbg, entropy, ENTROPY_NONCE_SZ, NULL, 0) == DRBG_SUCCESS) { ret = Hash_DRBG_Generate(rng->drbg, NULL, 0); } else ret = DRBG_FAILURE; XMEMSET(entropy, 0, ENTROPY_NONCE_SZ); if (ret == DRBG_SUCCESS) { rng->status = DRBG_OK; ret = 0; } else if (ret == DRBG_CONT_FAILURE) { rng->status = DRBG_CONT_FAILED; ret = DRBG_CONT_FIPS_E; } else if (ret == DRBG_FAILURE) { rng->status = DRBG_FAILED; ret = RNG_FAILURE_E; } else { rng->status = DRBG_FAILED; } } 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->drbg, output, sz); if (ret == DRBG_NEED_RESEED) { byte entropy[ENTROPY_SZ]; if (GenerateSeed(&rng->seed, entropy, ENTROPY_SZ) == 0 && Hash_DRBG_Reseed(rng->drbg, entropy, ENTROPY_SZ) == DRBG_SUCCESS) { ret = Hash_DRBG_Generate(rng->drbg, NULL, 0); if (ret == DRBG_SUCCESS) ret = Hash_DRBG_Generate(rng->drbg, output, sz); } else ret = DRBG_FAILURE; XMEMSET(entropy, 0, ENTROPY_SZ); } if (ret == DRBG_SUCCESS) { ret = 0; } else if (ret == DRBG_CONT_FAILURE) { ret = DRBG_CONT_FIPS_E; rng->status = DRBG_CONT_FAILED; } 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) == DRBG_SUCCESS) ret = 0; else ret = RNG_FAILURE_E; XFREE(rng->drbg, NULL, DYNAMIC_TYPE_RNG); rng->drbg = NULL; rng->status = DRBG_NOT_INIT; } return ret; } int RNG_HealthTest(int reseed, const byte* entropyA, word32 entropyASz, const byte* entropyB, word32 entropyBSz, byte* output, word32 outputSz) { DRBG drbg; if (entropyA == NULL || output == NULL) return BAD_FUNC_ARG; if (reseed != 0 && entropyB == NULL) return BAD_FUNC_ARG; if (outputSz != (SHA256_DIGEST_SIZE * 4)) return -1; if (Hash_DRBG_Instantiate(&drbg, entropyA, entropyASz, NULL, 0) != 0) return -1; if (reseed) { if (Hash_DRBG_Reseed(&drbg, entropyB, entropyBSz) != 0) { Hash_DRBG_Uninstantiate(&drbg); return -1; } } if (Hash_DRBG_Generate(&drbg, output, outputSz) != 0) { Hash_DRBG_Uninstantiate(&drbg); return -1; } if (Hash_DRBG_Generate(&drbg, output, outputSz) != 0) { Hash_DRBG_Uninstantiate(&drbg); return -1; } Hash_DRBG_Uninstantiate(&drbg); 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) { cyassl_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(CYASSL_TIRTOS) #include <xdc/runtime/Timestamp.h> #include <stdlib.h> int GenerateSeed(OS_Seed* os, byte* output, word32 sz) { int i; srand(xdc_runtime_Timestamp_get32()); for (i = 0; i < sz; i++ ) { output[i] = rand() % 256; if ((i % 8) == 7) { srand(xdc_runtime_Timestamp_get32()); } } 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 */