| /* random.c |
| * |
| * Copyright (C) 2006-2015 wolfSSL Inc. |
| * |
| * This file is part of wolfSSL. (formerly known as CyaSSL) |
| * |
| * wolfSSL 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. |
| * |
| * wolfSSL 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 <wolfssl/wolfcrypt/settings.h> |
| |
| /* on HPUX 11 you may need to install /dev/random see |
| http://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=KRNG11I |
| |
| */ |
| |
| #include <wolfssl/wolfcrypt/random.h> |
| |
| #ifdef HAVE_FIPS |
| int wc_GenerateSeed(OS_Seed* os, byte* seed, word32 sz) |
| { |
| return GenerateSeed(os, seed, sz); |
| } |
| |
| #ifdef HAVE_CAVIUM |
| int wc_InitRngCavium(RNG* rng, int i) |
| { |
| return InitRngCavium(rng, i); |
| } |
| #endif |
| |
| |
| int wc_InitRng(RNG* rng) |
| { |
| return InitRng_fips(rng); |
| } |
| |
| |
| int wc_RNG_GenerateBlock(RNG* rng, byte* b, word32 sz) |
| { |
| return RNG_GenerateBlock_fips(rng, b, sz); |
| } |
| |
| |
| int wc_RNG_GenerateByte(RNG* rng, byte* b) |
| { |
| return RNG_GenerateByte(rng, b); |
| } |
| |
| #if defined(HAVE_HASHDRBG) || defined(NO_RC4) |
| |
| int wc_FreeRng(RNG* rng) |
| { |
| return FreeRng_fips(rng); |
| } |
| |
| |
| int wc_RNG_HealthTest(int reseed, |
| const byte* entropyA, word32 entropyASz, |
| const byte* entropyB, word32 entropyBSz, |
| byte* output, word32 outputSz) |
| { |
| return RNG_HealthTest_fips(reseed, entropyA, entropyASz, |
| entropyB, entropyBSz, output, outputSz); |
| } |
| #endif /* HAVE_HASHDRBG || NO_RC4 */ |
| #else /* else build without fips */ |
| #include <wolfssl/wolfcrypt/error-crypt.h> |
| |
| #if defined(HAVE_HASHDRBG) || defined(NO_RC4) |
| |
| #include <wolfssl/wolfcrypt/sha256.h> |
| |
| #ifdef NO_INLINE |
| #include <wolfssl/wolfcrypt/misc.h> |
| #else |
| #include <wolfcrypt/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(CUSTOM_RAND_GENERATE) && \ |
| !defined(WOLFSSL_MDK_ARM) && !defined(WOLFSSL_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 */ |
| |
| #ifdef HAVE_INTEL_RDGEN |
| static int wc_InitRng_IntelRD(void) ; |
| #if defined(HAVE_HASHDRBG) || defined(NO_RC4) |
| static int wc_GenerateSeed_IntelRD(OS_Seed* os, byte* output, word32 sz) ; |
| #else |
| static int wc_GenerateRand_IntelRD(OS_Seed* os, byte* output, word32 sz) ; |
| #endif |
| static word32 cpuid_check = 0 ; |
| static word32 cpuid_flags = 0 ; |
| #define CPUID_RDRAND 0x4 |
| #define CPUID_RDSEED 0x8 |
| #define IS_INTEL_RDRAND (cpuid_flags&CPUID_RDRAND) |
| #define IS_INTEL_RDSEED (cpuid_flags&CPUID_RDSEED) |
| #endif |
| |
| #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 { |
| word32 reseedCtr; |
| word32 lastBlock; |
| byte V[DRBG_SEED_LEN]; |
| byte C[DRBG_SEED_LEN]; |
| byte matchCount; |
| } DRBG; |
| |
| |
| static int wc_RNG_HealthTestLocal(int reseed); |
| |
| /* 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 */ |
| Sha256 sha; |
| byte digest[SHA256_DIGEST_SIZE]; |
| |
| (void)drbg; |
| #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 (wc_InitSha256(&sha) != 0) |
| return DRBG_FAILURE; |
| |
| if (wc_Sha256Update(&sha, &ctr, sizeof(ctr)) != 0) |
| return DRBG_FAILURE; |
| |
| if (wc_Sha256Update(&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 (wc_Sha256Update(&sha, &type, sizeof(type)) != 0) |
| return DRBG_FAILURE; |
| |
| if (wc_Sha256Update(&sha, inA, inASz) != 0) |
| return DRBG_FAILURE; |
| |
| if (inB != NULL && inBSz > 0) |
| if (wc_Sha256Update(&sha, inB, inBSz) != 0) |
| return DRBG_FAILURE; |
| |
| if (wc_Sha256Final(&sha, digest) != 0) |
| return DRBG_FAILURE; |
| |
| if (outSz > OUTPUT_BLOCK_LEN) { |
| XMEMCPY(out, digest, OUTPUT_BLOCK_LEN); |
| outSz -= OUTPUT_BLOCK_LEN; |
| out += OUTPUT_BLOCK_LEN; |
| } |
| else { |
| XMEMCPY(out, digest, outSz); |
| } |
| } |
| ForceZero(digest, sizeof(digest)); |
| |
| 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)); |
| ForceZero(seed, 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; |
| Sha256 sha; |
| byte digest[SHA256_DIGEST_SIZE]; |
| |
| /* Special case: outSz is 0 and out is NULL. wc_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 (wc_InitSha256(&sha) != 0 || |
| wc_Sha256Update(&sha, data, sizeof(data)) != 0 || |
| wc_Sha256Final(&sha, digest) != 0) { |
| |
| return DRBG_FAILURE; |
| } |
| |
| XMEMCPY(&checkBlock, digest, sizeof(word32)); |
| 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, 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, digest, outSz); |
| outSz = 0; |
| } |
| } |
| ForceZero(data, 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] = (byte)carry; |
| carry >>= 8; |
| } |
| |
| for (; carry != 0 && dIdx >= 0; dIdx--) { |
| carry += d[dIdx]; |
| d[dIdx] = (byte)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; |
| Sha256 sha; |
| byte digest[SHA256_DIGEST_SIZE]; |
| |
| 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 (wc_InitSha256(&sha) != 0 || |
| wc_Sha256Update(&sha, &type, sizeof(type)) != 0 || |
| wc_Sha256Update(&sha, drbg->V, sizeof(drbg->V)) != 0 || |
| wc_Sha256Final(&sha, digest) != 0) { |
| |
| ret = DRBG_FAILURE; |
| } |
| else { |
| array_add(drbg->V, sizeof(drbg->V), digest, sizeof(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++; |
| } |
| } |
| ForceZero(digest, sizeof(digest)); |
| |
| 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 or DRBG_FAILURE */ |
| static int Hash_DRBG_Uninstantiate(DRBG* drbg) |
| { |
| word32 i; |
| int compareSum = 0; |
| byte* compareDrbg = (byte*)drbg; |
| |
| ForceZero(drbg, sizeof(DRBG)); |
| |
| for (i = 0; i < sizeof(DRBG); i++) |
| compareSum |= compareDrbg[i] ^ 0; |
| |
| return (compareSum == 0) ? DRBG_SUCCESS : DRBG_FAILURE; |
| } |
| |
| /* End NIST DRBG Code */ |
| |
| |
| /* Get seed and key cipher */ |
| int wc_InitRng(RNG* rng) |
| { |
| int ret = BAD_FUNC_ARG; |
| |
| if (rng != NULL) { |
| if (wc_RNG_HealthTestLocal(0) == 0) { |
| 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 (wc_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; |
| |
| ForceZero(entropy, ENTROPY_NONCE_SZ); |
| } |
| else |
| ret = DRBG_CONT_FAILURE; |
| |
| 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 wc_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) { |
| if (wc_RNG_HealthTestLocal(1) == 0) { |
| byte entropy[ENTROPY_SZ]; |
| |
| if (wc_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; |
| |
| ForceZero(entropy, ENTROPY_SZ); |
| } |
| else |
| ret = DRBG_CONT_FAILURE; |
| } |
| |
| 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 wc_RNG_GenerateByte(RNG* rng, byte* b) |
| { |
| return wc_RNG_GenerateBlock(rng, b, 1); |
| } |
| |
| |
| int wc_FreeRng(RNG* rng) |
| { |
| int ret = BAD_FUNC_ARG; |
| |
| if (rng != NULL) { |
| if (rng->drbg != 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 wc_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; |
| } |
| |
| if (Hash_DRBG_Uninstantiate(&drbg) != 0) { |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| |
| const byte entropyA[] = { |
| 0x63, 0x36, 0x33, 0x77, 0xe4, 0x1e, 0x86, 0x46, 0x8d, 0xeb, 0x0a, 0xb4, |
| 0xa8, 0xed, 0x68, 0x3f, 0x6a, 0x13, 0x4e, 0x47, 0xe0, 0x14, 0xc7, 0x00, |
| 0x45, 0x4e, 0x81, 0xe9, 0x53, 0x58, 0xa5, 0x69, 0x80, 0x8a, 0xa3, 0x8f, |
| 0x2a, 0x72, 0xa6, 0x23, 0x59, 0x91, 0x5a, 0x9f, 0x8a, 0x04, 0xca, 0x68 |
| }; |
| |
| const byte reseedEntropyA[] = { |
| 0xe6, 0x2b, 0x8a, 0x8e, 0xe8, 0xf1, 0x41, 0xb6, 0x98, 0x05, 0x66, 0xe3, |
| 0xbf, 0xe3, 0xc0, 0x49, 0x03, 0xda, 0xd4, 0xac, 0x2c, 0xdf, 0x9f, 0x22, |
| 0x80, 0x01, 0x0a, 0x67, 0x39, 0xbc, 0x83, 0xd3 |
| }; |
| |
| const byte outputA[] = { |
| 0x04, 0xee, 0xc6, 0x3b, 0xb2, 0x31, 0xdf, 0x2c, 0x63, 0x0a, 0x1a, 0xfb, |
| 0xe7, 0x24, 0x94, 0x9d, 0x00, 0x5a, 0x58, 0x78, 0x51, 0xe1, 0xaa, 0x79, |
| 0x5e, 0x47, 0x73, 0x47, 0xc8, 0xb0, 0x56, 0x62, 0x1c, 0x18, 0xbd, 0xdc, |
| 0xdd, 0x8d, 0x99, 0xfc, 0x5f, 0xc2, 0xb9, 0x20, 0x53, 0xd8, 0xcf, 0xac, |
| 0xfb, 0x0b, 0xb8, 0x83, 0x12, 0x05, 0xfa, 0xd1, 0xdd, 0xd6, 0xc0, 0x71, |
| 0x31, 0x8a, 0x60, 0x18, 0xf0, 0x3b, 0x73, 0xf5, 0xed, 0xe4, 0xd4, 0xd0, |
| 0x71, 0xf9, 0xde, 0x03, 0xfd, 0x7a, 0xea, 0x10, 0x5d, 0x92, 0x99, 0xb8, |
| 0xaf, 0x99, 0xaa, 0x07, 0x5b, 0xdb, 0x4d, 0xb9, 0xaa, 0x28, 0xc1, 0x8d, |
| 0x17, 0x4b, 0x56, 0xee, 0x2a, 0x01, 0x4d, 0x09, 0x88, 0x96, 0xff, 0x22, |
| 0x82, 0xc9, 0x55, 0xa8, 0x19, 0x69, 0xe0, 0x69, 0xfa, 0x8c, 0xe0, 0x07, |
| 0xa1, 0x80, 0x18, 0x3a, 0x07, 0xdf, 0xae, 0x17 |
| }; |
| |
| const byte entropyB[] = { |
| 0xa6, 0x5a, 0xd0, 0xf3, 0x45, 0xdb, 0x4e, 0x0e, 0xff, 0xe8, 0x75, 0xc3, |
| 0xa2, 0xe7, 0x1f, 0x42, 0xc7, 0x12, 0x9d, 0x62, 0x0f, 0xf5, 0xc1, 0x19, |
| 0xa9, 0xef, 0x55, 0xf0, 0x51, 0x85, 0xe0, 0xfb, 0x85, 0x81, 0xf9, 0x31, |
| 0x75, 0x17, 0x27, 0x6e, 0x06, 0xe9, 0x60, 0x7d, 0xdb, 0xcb, 0xcc, 0x2e |
| }; |
| |
| const byte outputB[] = { |
| 0xd3, 0xe1, 0x60, 0xc3, 0x5b, 0x99, 0xf3, 0x40, 0xb2, 0x62, 0x82, 0x64, |
| 0xd1, 0x75, 0x10, 0x60, 0xe0, 0x04, 0x5d, 0xa3, 0x83, 0xff, 0x57, 0xa5, |
| 0x7d, 0x73, 0xa6, 0x73, 0xd2, 0xb8, 0xd8, 0x0d, 0xaa, 0xf6, 0xa6, 0xc3, |
| 0x5a, 0x91, 0xbb, 0x45, 0x79, 0xd7, 0x3f, 0xd0, 0xc8, 0xfe, 0xd1, 0x11, |
| 0xb0, 0x39, 0x13, 0x06, 0x82, 0x8a, 0xdf, 0xed, 0x52, 0x8f, 0x01, 0x81, |
| 0x21, 0xb3, 0xfe, 0xbd, 0xc3, 0x43, 0xe7, 0x97, 0xb8, 0x7d, 0xbb, 0x63, |
| 0xdb, 0x13, 0x33, 0xde, 0xd9, 0xd1, 0xec, 0xe1, 0x77, 0xcf, 0xa6, 0xb7, |
| 0x1f, 0xe8, 0xab, 0x1d, 0xa4, 0x66, 0x24, 0xed, 0x64, 0x15, 0xe5, 0x1c, |
| 0xcd, 0xe2, 0xc7, 0xca, 0x86, 0xe2, 0x83, 0x99, 0x0e, 0xea, 0xeb, 0x91, |
| 0x12, 0x04, 0x15, 0x52, 0x8b, 0x22, 0x95, 0x91, 0x02, 0x81, 0xb0, 0x2d, |
| 0xd4, 0x31, 0xf4, 0xc9, 0xf7, 0x04, 0x27, 0xdf |
| }; |
| |
| |
| static int wc_RNG_HealthTestLocal(int reseed) |
| { |
| int ret = 0; |
| byte check[SHA256_DIGEST_SIZE * 4]; |
| |
| if (reseed) { |
| ret = wc_RNG_HealthTest(1, entropyA, sizeof(entropyA), |
| reseedEntropyA, sizeof(reseedEntropyA), |
| check, sizeof(check)); |
| if (ret == 0) { |
| if (ConstantCompare(check, outputA, sizeof(check)) != 0) |
| ret = -1; |
| } |
| } |
| else { |
| ret = wc_RNG_HealthTest(0, entropyB, sizeof(entropyB), |
| NULL, 0, |
| check, sizeof(check)); |
| if (ret == 0) { |
| if (ConstantCompare(check, outputB, sizeof(check)) != 0) |
| ret = -1; |
| } |
| } |
| |
| return ret; |
| } |
| |
| |
| #else /* HAVE_HASHDRBG || NO_RC4 */ |
| |
| /* Get seed and key cipher */ |
| int wc_InitRng(RNG* rng) |
| { |
| int ret; |
| #ifdef WOLFSSL_SMALL_STACK |
| byte* key; |
| byte* junk; |
| #else |
| byte key[32]; |
| byte junk[256]; |
| #endif |
| |
| #ifdef HAVE_INTEL_RDGEN |
| wc_InitRng_IntelRD() ; |
| if(IS_INTEL_RDRAND)return 0 ; |
| #endif |
| #ifdef HAVE_CAVIUM |
| if (rng->magic == WOLFSSL_RNG_CAVIUM_MAGIC) |
| return 0; |
| #endif |
| |
| #ifdef WOLFSSL_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 = wc_GenerateSeed(&rng->seed, key, 32); |
| |
| if (ret == 0) { |
| wc_Arc4SetKey(&rng->cipher, key, sizeof(key)); |
| |
| ret = wc_RNG_GenerateBlock(rng, junk, 256); /*rid initial state*/ |
| } |
| |
| #ifdef WOLFSSL_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 wc_RNG_GenerateBlock(RNG* rng, byte* output, word32 sz) |
| { |
| #ifdef HAVE_INTEL_RDGEN |
| if(IS_INTEL_RDRAND) |
| return wc_GenerateRand_IntelRD(NULL, output, sz) ; |
| #endif |
| #ifdef HAVE_CAVIUM |
| if (rng->magic == WOLFSSL_RNG_CAVIUM_MAGIC) |
| return CaviumRNG_GenerateBlock(rng, output, sz); |
| #endif |
| XMEMSET(output, 0, sz); |
| wc_Arc4Process(&rng->cipher, output, output, sz); |
| |
| return 0; |
| } |
| |
| |
| int wc_RNG_GenerateByte(RNG* rng, byte* b) |
| { |
| return wc_RNG_GenerateBlock(rng, b, 1); |
| } |
| |
| |
| int wc_FreeRng(RNG* rng) |
| { |
| (void)rng; |
| return 0; |
| } |
| |
| |
| #ifdef HAVE_CAVIUM |
| |
| #include <wolfssl/ctaocrypt/logging.h> |
| #include "cavium_common.h" |
| |
| /* Initiliaze RNG for use with Nitrox device */ |
| int wc_InitRngCavium(RNG* rng, int devId) |
| { |
| if (rng == NULL) |
| return -1; |
| |
| rng->devId = devId; |
| rng->magic = WOLFSSL_RNG_CAVIUM_MAGIC; |
| |
| return 0; |
| } |
| |
| |
| static void CaviumRNG_GenerateBlock(RNG* rng, byte* output, word32 sz) |
| { |
| wolfssl_word offset = 0; |
| word32 requestId; |
| |
| while (sz > WOLFSSL_MAX_16BIT) { |
| word16 slen = (word16)WOLFSSL_MAX_16BIT; |
| if (CspRandom(CAVIUM_BLOCKING, slen, output + offset, &requestId, |
| rng->devId) != 0) { |
| WOLFSSL_MSG("Cavium RNG failed"); |
| } |
| sz -= WOLFSSL_MAX_16BIT; |
| offset += WOLFSSL_MAX_16BIT; |
| } |
| if (sz) { |
| word16 slen = (word16)sz; |
| if (CspRandom(CAVIUM_BLOCKING, slen, output + offset, &requestId, |
| rng->devId) != 0) { |
| WOLFSSL_MSG("Cavium RNG failed"); |
| } |
| } |
| } |
| |
| #endif /* HAVE_CAVIUM */ |
| |
| #endif /* HAVE_HASHDRBG || NO_RC4 */ |
| |
| |
| #if defined(HAVE_INTEL_RDGEN) |
| |
| #ifndef _MSC_VER |
| #define cpuid(reg, leaf, sub)\ |
| __asm__ __volatile__ ("cpuid":\ |
| "=a" (reg[0]), "=b" (reg[1]), "=c" (reg[2]), "=d" (reg[3]) :\ |
| "a" (leaf), "c"(sub)); |
| |
| #define XASM_LINK(f) asm(f) |
| #else |
| |
| #include <intrin.h> |
| #define cpuid(a,b) __cpuid((int*)a,b) |
| |
| #define XASM_LINK(f) |
| |
| #endif /* _MSC_VER */ |
| |
| #define EAX 0 |
| #define EBX 1 |
| #define ECX 2 |
| #define EDX 3 |
| |
| static word32 cpuid_flag(word32 leaf, word32 sub, word32 num, word32 bit) { |
| int got_intel_cpu=0; |
| unsigned int reg[5]; |
| |
| reg[4] = '\0' ; |
| cpuid(reg, 0, 0); |
| if(memcmp((char *)&(reg[EBX]), "Genu", 4) == 0 && |
| memcmp((char *)&(reg[EDX]), "ineI", 4) == 0 && |
| memcmp((char *)&(reg[ECX]), "ntel", 4) == 0) { |
| got_intel_cpu = 1; |
| } |
| if (got_intel_cpu) { |
| cpuid(reg, leaf, sub); |
| return((reg[num]>>bit)&0x1) ; |
| } |
| return 0 ; |
| } |
| |
| static int wc_InitRng_IntelRD() |
| { |
| if(cpuid_check==0) { |
| if(cpuid_flag(1, 0, ECX, 30)){ cpuid_flags |= CPUID_RDRAND ;} |
| if(cpuid_flag(7, 0, EBX, 18)){ cpuid_flags |= CPUID_RDSEED ;} |
| cpuid_check = 1 ; |
| } |
| return 1 ; |
| } |
| |
| #define INTELRD_RETRY 10 |
| |
| #if defined(HAVE_HASHDRBG) || defined(NO_RC4) |
| |
| /* return 0 on success */ |
| static inline int IntelRDseed32(unsigned int *seed) |
| { |
| int rdseed; unsigned char ok ; |
| |
| __asm__ volatile("rdseed %0; setc %1":"=r"(rdseed), "=qm"(ok)); |
| if(ok){ |
| *seed = rdseed ; |
| return 0 ; |
| } else |
| return 1; |
| } |
| |
| /* return 0 on success */ |
| static inline int IntelRDseed32_r(unsigned int *rnd) |
| { |
| int i ; |
| for(i=0; i<INTELRD_RETRY;i++) { |
| if(IntelRDseed32(rnd) == 0) return 0 ; |
| } |
| return 1 ; |
| } |
| |
| /* return 0 on success */ |
| static int wc_GenerateSeed_IntelRD(OS_Seed* os, byte* output, word32 sz) |
| { |
| (void) os ; |
| int ret ; |
| unsigned int rndTmp ; |
| |
| for( ; sz/4 > 0; sz-=4, output+=4) { |
| if(IS_INTEL_RDSEED)ret = IntelRDseed32_r((word32 *)output) ; |
| else return 1 ; |
| if(ret) |
| return 1 ; |
| } |
| if(sz == 0)return 0 ; |
| |
| if(IS_INTEL_RDSEED)ret = IntelRDseed32_r(&rndTmp) ; |
| else return 1 ; |
| if(ret) |
| return 1 ; |
| XMEMCPY(output, &rndTmp, sz) ; |
| return 0; |
| } |
| |
| #else |
| |
| /* return 0 on success */ |
| static inline int IntelRDrand32(unsigned int *rnd) |
| { |
| int rdrand; unsigned char ok ; |
| __asm__ volatile("rdrand %0; setc %1":"=r"(rdrand), "=qm"(ok)); |
| if(ok){ |
| *rnd = rdrand; |
| return 0 ; |
| } else |
| return 1; |
| } |
| |
| /* return 0 on success */ |
| static inline int IntelRDrand32_r(unsigned int *rnd) |
| { |
| int i ; |
| for(i=0; i<INTELRD_RETRY;i++) { |
| if(IntelRDrand32(rnd) == 0) return 0 ; |
| } |
| return 1 ; |
| } |
| |
| /* return 0 on success */ |
| static int wc_GenerateRand_IntelRD(OS_Seed* os, byte* output, word32 sz) |
| { |
| (void) os ; |
| int ret ; |
| unsigned int rndTmp; |
| |
| for( ; sz/4 > 0; sz-=4, output+=4) { |
| if(IS_INTEL_RDRAND)ret = IntelRDrand32_r((word32 *)output); |
| else return 1 ; |
| if(ret) |
| return 1 ; |
| } |
| if(sz == 0)return 0 ; |
| |
| if(IS_INTEL_RDRAND)ret = IntelRDrand32_r(&rndTmp); |
| else return 1 ; |
| if(ret) |
| return 1 ; |
| XMEMCPY(output, &rndTmp, sz) ; |
| return 0; |
| } |
| #endif /* defined(HAVE_HASHDRBG) || defined(NO_RC4) */ |
| |
| #endif /* HAVE_INTEL_RDGEN */ |
| |
| |
| #if defined(USE_WINDOWS_API) |
| |
| |
| int wc_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 wc_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 wc_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 wc_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(WOLFSSL_MICROCHIP_PIC32MZ) |
| #include <peripheral/timer.h> |
| #endif |
| #define PIC32_SEED_COUNT ReadCoreTimer |
| #endif |
| #ifdef WOLFSSL_MIC32MZ_RNG |
| #include "xc.h" |
| int wc_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_WOLFSSL |
| 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 /* WOLFSSL_MIC32MZ_RNG */ |
| /* uses the core timer, in nanoseconds to seed srand */ |
| int wc_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 /* WOLFSSL_MIC32MZ_RNG */ |
| |
| #elif defined(FREESCALE_MQX) |
| |
| #ifdef FREESCALE_K70_RNGA |
| /* |
| * wc_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 wc_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) |
| /* |
| * wc_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 wc_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 wc_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(WOLFSSL_SAFERTOS) || defined(WOLFSSL_LEANPSK) \ |
| || defined(WOLFSSL_IAR_ARM) || defined(WOLFSSL_MDK_ARM) \ |
| || defined(WOLFSSL_uITRON4) || defined(WOLFSSL_uTKERNEL2) |
| |
| #warning "write a real random seed!!!!, just for testing now" |
| |
| int wc_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" |
| /* |
| * wc_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 wc_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(WOLFSSL_LPC43xx) || defined(WOLFSSL_STM32F2xx) |
| |
| #warning "write a real random seed!!!!, just for testing now" |
| |
| int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz) |
| { |
| int i; |
| |
| for (i = 0; i < sz; i++ ) |
| output[i] = i; |
| |
| return 0; |
| } |
| |
| #elif defined(WOLFSSL_TIRTOS) |
| |
| #include <xdc/runtime/Timestamp.h> |
| #include <stdlib.h> |
| int wc_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 wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz) |
| { |
| word32 i; |
| |
| (void)os; |
| |
| 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 wc_GenerateSeed() here" |
| |
| /* |
| int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz) |
| { |
| return 0; |
| } |
| */ |
| |
| |
| #else /* !USE_WINDOWS_API && !HAVE_RPT_SYS && !MICRIUM && !NO_DEV_RANDOM */ |
| |
| /* may block */ |
| int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz) |
| { |
| int ret = 0; |
| |
| |
| #if defined(HAVE_INTEL_RDGEN) && (defined(HAVE_HASHDRBG) || defined(NO_RC4)) |
| wc_InitRng_IntelRD() ; /* set cpuid_flags if not yet */ |
| if(IS_INTEL_RDSEED) |
| return wc_GenerateSeed_IntelRD(NULL, output, sz) ; |
| #endif |
| |
| 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 */ |
| #endif /* HAVE_FIPS */ |
| |
