wolf SSL
wolfSSL SSL/TLS library, support up to TLS1.3
Dependents: CyaSSL-Twitter-OAuth4Tw Example-client-tls-cert TwitterReader TweetTest ... more
Diff: wolfcrypt/src/random.c
- Revision:
- 13:f67a6c6013ca
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/wolfcrypt/src/random.c Tue Aug 22 10:48:22 2017 +0000
@@ -0,0 +1,1741 @@
+/* random.c
+ *
+ * Copyright (C) 2006-2016 wolfSSL Inc.
+ *
+ * This file is part of wolfSSL.
+ *
+ * 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 02110-1335, 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>
+#include <wolfssl/wolfcrypt/cpuid.h>
+
+
+#ifdef HAVE_FIPS
+int wc_GenerateSeed(OS_Seed* os, byte* seed, word32 sz)
+{
+ return GenerateSeed(os, seed, sz);
+}
+
+int wc_InitRng_ex(WC_RNG* rng, void* heap, int devId)
+{
+ (void)heap;
+ (void)devId;
+ return InitRng_fips(rng);
+}
+
+int wc_InitRng(WC_RNG* rng)
+{
+ return InitRng_fips(rng);
+}
+
+
+int wc_RNG_GenerateBlock(WC_RNG* rng, byte* b, word32 sz)
+{
+ return RNG_GenerateBlock_fips(rng, b, sz);
+}
+
+
+int wc_RNG_GenerateByte(WC_RNG* rng, byte* b)
+{
+ return RNG_GenerateByte(rng, b);
+}
+
+#ifdef HAVE_HASHDRBG
+
+ int wc_FreeRng(WC_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 */
+
+#else /* else build without fips */
+
+#ifndef WC_NO_RNG /* if not FIPS and RNG is disabled then do not compile */
+
+#include <wolfssl/wolfcrypt/error-crypt.h>
+#include <wolfssl/wolfcrypt/sha256.h>
+
+#ifdef NO_INLINE
+ #include <wolfssl/wolfcrypt/misc.h>
+#else
+ #define WOLFSSL_MISC_INCLUDED
+ #include <wolfcrypt/src/misc.c>
+#endif
+
+#if defined(WOLFSSL_SGX)
+ #include <sgx_trts.h>
+#elif defined(USE_WINDOWS_API)
+ #ifndef _WIN32_WINNT
+ #define _WIN32_WINNT 0x0400
+ #endif
+ #include <windows.h>
+ #include <wincrypt.h>
+#elif defined(HAVE_WNR)
+ #include <wnr.h>
+ #include <wolfssl/wolfcrypt/logging.h>
+ wolfSSL_Mutex wnr_mutex; /* global netRandom mutex */
+ int wnr_timeout = 0; /* entropy timeout, mililseconds */
+ int wnr_mutex_init = 0; /* flag for mutex init */
+ wnr_context* wnr_ctx; /* global netRandom context */
+#elif defined(FREESCALE_KSDK_2_0_TRNG)
+ #include "fsl_trng.h"
+#elif defined(FREESCALE_KSDK_2_0_RNGA)
+ #include "fsl_rnga.h"
+
+#elif defined(NO_DEV_RANDOM)
+#elif defined(CUSTOM_RAND_GENERATE)
+#elif defined(CUSTOM_RAND_GENERATE_BLOCK)
+#elif defined(CUSTOM_RAND_GENERATE_SEED)
+#elif defined(WOLFSSL_GENSEED_FORTEST)
+#elif defined(WOLFSSL_MDK_ARM)
+#elif defined(WOLFSSL_IAR_ARM)
+#elif defined(WOLFSSL_ROWLEY_ARM)
+#elif defined(WOLFSSL_EMBOS)
+#else
+ /* include headers that may be needed to get good seed */
+ #include <fcntl.h>
+ #ifndef EBSNET
+ #include <unistd.h>
+ #endif
+#endif
+
+
+#if defined(HAVE_INTEL_RDRAND) || defined(HAVE_INTEL_RDSEED)
+ static word32 intel_flags = 0;
+ static void wc_InitRng_IntelRD(void)
+ {
+ intel_flags = cpuid_get_flags();
+ }
+ #ifdef HAVE_INTEL_RDSEED
+ static int wc_GenerateSeed_IntelRD(OS_Seed* os, byte* output, word32 sz);
+ #endif
+ #ifdef HAVE_INTEL_RDRAND
+ static int wc_GenerateRand_IntelRD(OS_Seed* os, byte* output, word32 sz);
+ #endif
+#endif
+
+/* Start NIST DRBG code */
+#ifdef HAVE_HASHDRBG
+
+#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
+
+#define RNG_HEALTH_TEST_CHECK_SIZE (SHA256_DIGEST_SIZE * 4)
+
+/* Verify max gen block len */
+#if RNG_MAX_BLOCK_LEN > MAX_REQUEST_LEN
+ #error RNG_MAX_BLOCK_LEN is larger than NIST DBRG max request length
+#endif
+
+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];
+#ifdef WOLFSSL_ASYNC_CRYPT
+ void* heap;
+ int devId;
+#endif
+ 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)
+{
+ int ret = DRBG_FAILURE;
+ byte ctr;
+ int i;
+ int len;
+ word32 bits = (outSz * 8); /* reverse byte order */
+ Sha256 sha;
+ DECLARE_VAR(digest, byte, SHA256_DIGEST_SIZE, drbg->heap);
+
+ (void)drbg;
+#ifdef WOLFSSL_ASYNC_CRYPT
+ if (digest == NULL)
+ return DRBG_FAILURE;
+#endif
+
+#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++) {
+ #ifdef WOLFSSL_ASYNC_CRYPT
+ ret = wc_InitSha256_ex(&sha, drbg->heap, drbg->devId);
+ #else
+ ret = wc_InitSha256(&sha);
+ #endif
+ if (ret != 0)
+ break;
+
+ if (ret == 0)
+ ret = wc_Sha256Update(&sha, &ctr, sizeof(ctr));
+ if (ret == 0)
+ ret = wc_Sha256Update(&sha, (byte*)&bits, sizeof(bits));
+
+ if (ret == 0) {
+ /* churning V is the only string that doesn't have the type added */
+ if (type != drbgInitV)
+ ret = wc_Sha256Update(&sha, &type, sizeof(type));
+ }
+ if (ret == 0)
+ ret = wc_Sha256Update(&sha, inA, inASz);
+ if (ret == 0) {
+ if (inB != NULL && inBSz > 0)
+ ret = wc_Sha256Update(&sha, inB, inBSz);
+ }
+ if (ret == 0)
+ ret = wc_Sha256Final(&sha, digest);
+
+ wc_Sha256Free(&sha);
+ if (ret == 0) {
+ 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, SHA256_DIGEST_SIZE);
+
+ FREE_VAR(digest, drbg->heap);
+
+ return (ret == 0) ? DRBG_SUCCESS : DRBG_FAILURE;
+}
+
+/* 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)
+{
+ int ret = DRBG_FAILURE;
+ byte data[DRBG_SEED_LEN];
+ int i;
+ int len;
+ word32 checkBlock;
+ Sha256 sha;
+ DECLARE_VAR(digest, byte, SHA256_DIGEST_SIZE, drbg->heap);
+
+ /* 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++) {
+ #ifdef WOLFSSL_ASYNC_CRYPT
+ ret = wc_InitSha256_ex(&sha, drbg->heap, drbg->devId);
+ #else
+ ret = wc_InitSha256(&sha);
+ #endif
+ if (ret == 0)
+ ret = wc_Sha256Update(&sha, data, sizeof(data));
+ if (ret == 0)
+ ret = wc_Sha256Final(&sha, digest);
+ wc_Sha256Free(&sha);
+
+ if (ret == 0) {
+ 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 (out != NULL && outSz != 0) {
+ 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 {
+ XMEMCPY(out, digest, outSz);
+ outSz = 0;
+ }
+ }
+ }
+ }
+ ForceZero(data, sizeof(data));
+
+ FREE_VAR(digest, drbg->heap);
+
+ return (ret == 0) ? DRBG_SUCCESS : DRBG_FAILURE;
+}
+
+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;
+ DECLARE_VAR(digest, byte, SHA256_DIGEST_SIZE, drbg->heap);
+
+ if (drbg->reseedCtr != RESEED_INTERVAL) {
+ byte type = drbgGenerateH;
+ word32 reseedCtr = drbg->reseedCtr;
+
+ ret = Hash_gen(drbg, out, outSz, drbg->V);
+ if (ret == DRBG_SUCCESS) {
+ #ifdef WOLFSSL_ASYNC_CRYPT
+ ret = wc_InitSha256_ex(&sha, drbg->heap, drbg->devId);
+ #else
+ ret = wc_InitSha256(&sha);
+ #endif
+ if (ret == 0)
+ ret = wc_Sha256Update(&sha, &type, sizeof(type));
+ if (ret == 0)
+ ret = wc_Sha256Update(&sha, drbg->V, sizeof(drbg->V));
+ if (ret == 0)
+ ret = wc_Sha256Final(&sha, digest);
+
+ wc_Sha256Free(&sha);
+
+ if (ret == 0) {
+ array_add(drbg->V, sizeof(drbg->V), digest, SHA256_DIGEST_SIZE);
+ 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, SHA256_DIGEST_SIZE);
+
+ FREE_VAR(digest, drbg->heap);
+
+ return (ret == 0) ? DRBG_SUCCESS : DRBG_FAILURE;
+}
+
+/* Returns: DRBG_SUCCESS or DRBG_FAILURE */
+static int Hash_DRBG_Instantiate(DRBG* drbg, const byte* seed, word32 seedSz,
+ const byte* nonce, word32 nonceSz,
+ void* heap, int devId)
+{
+ int ret = DRBG_FAILURE;
+
+ XMEMSET(drbg, 0, sizeof(DRBG));
+#ifdef WOLFSSL_ASYNC_CRYPT
+ drbg->heap = heap;
+ drbg->devId = devId;
+#else
+ (void)heap;
+ (void)devId;
+#endif
+
+ 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;
+}
+#endif /* HAVE_HASHDRBG */
+/* End NIST DRBG Code */
+
+
+int wc_InitRng_ex(WC_RNG* rng, void* heap, int devId)
+{
+ int ret = RNG_FAILURE_E;
+
+ if (rng == NULL)
+ return BAD_FUNC_ARG;
+
+#ifdef WOLFSSL_HEAP_TEST
+ rng->heap = (void*)WOLFSSL_HEAP_TEST;
+ (void)heap;
+#else
+ rng->heap = heap;
+#endif
+#ifdef WOLFSSL_ASYNC_CRYPT
+ rng->devId = devId;
+#else
+ (void)devId;
+#endif
+
+#ifdef HAVE_HASHDRBG
+ /* init the DBRG to known values */
+ rng->drbg = NULL;
+ rng->status = DRBG_NOT_INIT;
+#endif
+
+#if defined(HAVE_INTEL_RDSEED) || defined(HAVE_INTEL_RDRAND)
+ /* init the intel RD seed and/or rand */
+ wc_InitRng_IntelRD();
+#endif
+
+ /* configure async RNG source if available */
+#ifdef WOLFSSL_ASYNC_CRYPT
+ ret = wolfAsync_DevCtxInit(&rng->asyncDev, WOLFSSL_ASYNC_MARKER_RNG,
+ rng->heap, rng->devId);
+ if (ret != 0)
+ return ret;
+#endif
+
+#ifdef HAVE_INTEL_RDRAND
+ /* if CPU supports RDRAND, use it directly and by-pass DRBG init */
+ if (IS_INTEL_RDRAND(intel_flags))
+ return 0;
+#endif
+
+#ifdef CUSTOM_RAND_GENERATE_BLOCK
+ ret = 0; /* success */
+#else
+#ifdef HAVE_HASHDRBG
+ if (wc_RNG_HealthTestLocal(0) == 0) {
+ DECLARE_VAR(entropy, byte, ENTROPY_NONCE_SZ, rng->heap);
+
+ rng->drbg =
+ (struct DRBG*)XMALLOC(sizeof(DRBG), rng->heap,
+ 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, rng->heap, devId) == DRBG_SUCCESS) {
+ ret = Hash_DRBG_Generate(rng->drbg, NULL, 0);
+ }
+ else
+ ret = DRBG_FAILURE;
+
+ ForceZero(entropy, ENTROPY_NONCE_SZ);
+ FREE_VAR(entropy, rng->heap);
+ }
+ 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;
+ }
+#endif /* HAVE_HASHDRBG */
+#endif /* CUSTOM_RAND_GENERATE_BLOCK */
+
+ return ret;
+}
+
+int wc_InitRng(WC_RNG* rng)
+{
+ return wc_InitRng_ex(rng, NULL, INVALID_DEVID);
+}
+
+
+/* place a generated block in output */
+int wc_RNG_GenerateBlock(WC_RNG* rng, byte* output, word32 sz)
+{
+ int ret;
+
+ if (rng == NULL || output == NULL)
+ return BAD_FUNC_ARG;
+
+#ifdef HAVE_INTEL_RDRAND
+ if (IS_INTEL_RDRAND(intel_flags))
+ return wc_GenerateRand_IntelRD(NULL, output, sz);
+#endif
+
+#if defined(WOLFSSL_ASYNC_CRYPT)
+ if (rng->asyncDev.marker == WOLFSSL_ASYNC_MARKER_RNG) {
+ /* these are blocking */
+ #ifdef HAVE_CAVIUM
+ return NitroxRngGenerateBlock(rng, output, sz);
+ #elif defined(HAVE_INTEL_QA)
+ return IntelQaDrbg(&rng->asyncDev, output, sz);
+ #else
+ /* simulator not supported */
+ #endif
+ }
+#endif
+
+#ifdef CUSTOM_RAND_GENERATE_BLOCK
+ XMEMSET(output, 0, sz);
+ ret = CUSTOM_RAND_GENERATE_BLOCK(output, sz);
+#else
+
+#ifdef HAVE_HASHDRBG
+ if (sz > RNG_MAX_BLOCK_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;
+ }
+#else
+
+ /* if we get here then there is an RNG configuration error */
+ ret = RNG_FAILURE_E;
+
+#endif /* HAVE_HASHDRBG */
+#endif /* CUSTOM_RAND_GENERATE_BLOCK */
+
+ return ret;
+}
+
+
+int wc_RNG_GenerateByte(WC_RNG* rng, byte* b)
+{
+ return wc_RNG_GenerateBlock(rng, b, 1);
+}
+
+
+int wc_FreeRng(WC_RNG* rng)
+{
+ int ret = 0;
+
+ if (rng == NULL)
+ return BAD_FUNC_ARG;
+
+#if defined(WOLFSSL_ASYNC_CRYPT)
+ wolfAsync_DevCtxFree(&rng->asyncDev, WOLFSSL_ASYNC_MARKER_RNG);
+#endif
+
+#ifdef HAVE_HASHDRBG
+ if (rng->drbg != NULL) {
+ if (Hash_DRBG_Uninstantiate(rng->drbg) != DRBG_SUCCESS)
+ ret = RNG_FAILURE_E;
+
+ XFREE(rng->drbg, rng->heap, DYNAMIC_TYPE_RNG);
+ rng->drbg = NULL;
+ }
+
+ rng->status = DRBG_NOT_INIT;
+#endif /* HAVE_HASHDRBG */
+
+ return ret;
+}
+
+#ifdef HAVE_HASHDRBG
+int wc_RNG_HealthTest(int reseed, const byte* entropyA, word32 entropyASz,
+ const byte* entropyB, word32 entropyBSz,
+ byte* output, word32 outputSz)
+{
+ int ret = -1;
+ DRBG* drbg;
+#ifndef WOLFSSL_SMALL_STACK
+ DRBG drbg_var;
+#endif
+
+ if (entropyA == NULL || output == NULL) {
+ return BAD_FUNC_ARG;
+ }
+
+ if (reseed != 0 && entropyB == NULL) {
+ return BAD_FUNC_ARG;
+ }
+
+ if (outputSz != RNG_HEALTH_TEST_CHECK_SIZE) {
+ return ret;
+ }
+
+#ifdef WOLFSSL_SMALL_STACK
+ drbg = (struct DRBG*)XMALLOC(sizeof(DRBG), NULL, DYNAMIC_TYPE_RNG);
+ if (drbg == NULL) {
+ return MEMORY_E;
+ }
+#else
+ drbg = &drbg_var;
+#endif
+
+ if (Hash_DRBG_Instantiate(drbg, entropyA, entropyASz, NULL, 0, NULL,
+ INVALID_DEVID) != 0) {
+ goto exit_rng_ht;
+ }
+
+ if (reseed) {
+ if (Hash_DRBG_Reseed(drbg, entropyB, entropyBSz) != 0) {
+ goto exit_rng_ht;
+ }
+ }
+
+ if (Hash_DRBG_Generate(drbg, output, outputSz) != 0) {
+ goto exit_rng_ht;
+ }
+
+ if (Hash_DRBG_Generate(drbg, output, outputSz) != 0) {
+ goto exit_rng_ht;
+ }
+
+ /* Mark success */
+ ret = 0;
+
+exit_rng_ht:
+
+ /* This is safe to call even if Hash_DRBG_Instantiate fails */
+ if (Hash_DRBG_Uninstantiate(drbg) != 0) {
+ ret = -1;
+ }
+
+#ifdef WOLFSSL_SMALL_STACK
+ XFREE(drbg, NULL, DYNAMIC_TYPE_RNG);
+#endif
+
+ return ret;
+}
+
+
+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;
+#ifdef WOLFSSL_SMALL_STACK
+ byte* check;
+#else
+ byte check[RNG_HEALTH_TEST_CHECK_SIZE];
+#endif
+
+#ifdef WOLFSSL_SMALL_STACK
+ check = (byte*)XMALLOC(RNG_HEALTH_TEST_CHECK_SIZE, NULL,
+ DYNAMIC_TYPE_TMP_BUFFER);
+ if (check == NULL) {
+ return MEMORY_E;
+ }
+#endif
+
+ if (reseed) {
+ ret = wc_RNG_HealthTest(1, entropyA, sizeof(entropyA),
+ reseedEntropyA, sizeof(reseedEntropyA),
+ check, RNG_HEALTH_TEST_CHECK_SIZE);
+ if (ret == 0) {
+ if (ConstantCompare(check, outputA,
+ RNG_HEALTH_TEST_CHECK_SIZE) != 0)
+ ret = -1;
+ }
+ }
+ else {
+ ret = wc_RNG_HealthTest(0, entropyB, sizeof(entropyB),
+ NULL, 0,
+ check, RNG_HEALTH_TEST_CHECK_SIZE);
+ if (ret == 0) {
+ if (ConstantCompare(check, outputB,
+ RNG_HEALTH_TEST_CHECK_SIZE) != 0)
+ ret = -1;
+ }
+ }
+
+#ifdef WOLFSSL_SMALL_STACK
+ XFREE(check, NULL, DYNAMIC_TYPE_TMP_BUFFER);
+#endif
+
+ return ret;
+}
+
+#endif /* HAVE_HASHDRBG */
+
+
+#ifdef HAVE_WNR
+
+/*
+ * Init global Whitewood netRandom context
+ * Returns 0 on success, negative on error
+ */
+int wc_InitNetRandom(const char* configFile, wnr_hmac_key hmac_cb, int timeout)
+{
+ if (configFile == NULL || timeout < 0)
+ return BAD_FUNC_ARG;
+
+ if (wnr_mutex_init > 0) {
+ WOLFSSL_MSG("netRandom context already created, skipping");
+ return 0;
+ }
+
+ if (wc_InitMutex(&wnr_mutex) != 0) {
+ WOLFSSL_MSG("Bad Init Mutex wnr_mutex");
+ return BAD_MUTEX_E;
+ }
+ wnr_mutex_init = 1;
+
+ if (wc_LockMutex(&wnr_mutex) != 0) {
+ WOLFSSL_MSG("Bad Lock Mutex wnr_mutex");
+ return BAD_MUTEX_E;
+ }
+
+ /* store entropy timeout */
+ wnr_timeout = timeout;
+
+ /* create global wnr_context struct */
+ if (wnr_create(&wnr_ctx) != WNR_ERROR_NONE) {
+ WOLFSSL_MSG("Error creating global netRandom context");
+ return RNG_FAILURE_E;
+ }
+
+ /* load config file */
+ if (wnr_config_loadf(wnr_ctx, (char*)configFile) != WNR_ERROR_NONE) {
+ WOLFSSL_MSG("Error loading config file into netRandom context");
+ wnr_destroy(wnr_ctx);
+ wnr_ctx = NULL;
+ return RNG_FAILURE_E;
+ }
+
+ /* create/init polling mechanism */
+ if (wnr_poll_create() != WNR_ERROR_NONE) {
+ printf("ERROR: wnr_poll_create() failed\n");
+ WOLFSSL_MSG("Error initializing netRandom polling mechanism");
+ wnr_destroy(wnr_ctx);
+ wnr_ctx = NULL;
+ return RNG_FAILURE_E;
+ }
+
+ /* validate config, set HMAC callback (optional) */
+ if (wnr_setup(wnr_ctx, hmac_cb) != WNR_ERROR_NONE) {
+ WOLFSSL_MSG("Error setting up netRandom context");
+ wnr_destroy(wnr_ctx);
+ wnr_ctx = NULL;
+ wnr_poll_destroy();
+ return RNG_FAILURE_E;
+ }
+
+ wc_UnLockMutex(&wnr_mutex);
+
+ return 0;
+}
+
+/*
+ * Free global Whitewood netRandom context
+ * Returns 0 on success, negative on error
+ */
+int wc_FreeNetRandom(void)
+{
+ if (wnr_mutex_init > 0) {
+
+ if (wc_LockMutex(&wnr_mutex) != 0) {
+ WOLFSSL_MSG("Bad Lock Mutex wnr_mutex");
+ return BAD_MUTEX_E;
+ }
+
+ if (wnr_ctx != NULL) {
+ wnr_destroy(wnr_ctx);
+ wnr_ctx = NULL;
+ }
+ wnr_poll_destroy();
+
+ wc_UnLockMutex(&wnr_mutex);
+
+ wc_FreeMutex(&wnr_mutex);
+ wnr_mutex_init = 0;
+ }
+
+ return 0;
+}
+
+#endif /* HAVE_WNR */
+
+
+#if defined(HAVE_INTEL_RDRAND) || defined(HAVE_INTEL_RDSEED)
+
+#ifdef WOLFSSL_ASYNC_CRYPT
+ /* need more retries if multiple cores */
+ #define INTELRD_RETRY (32 * 8)
+#else
+ #define INTELRD_RETRY 32
+#endif
+
+#ifdef HAVE_INTEL_RDSEED
+
+/* return 0 on success */
+static INLINE int IntelRDseed64(word64* seed)
+{
+ unsigned char ok;
+
+ __asm__ volatile("rdseed %0; setc %1":"=r"(*seed), "=qm"(ok));
+ return (ok) ? 0 : -1;
+}
+
+/* return 0 on success */
+static INLINE int IntelRDseed64_r(word64* rnd)
+{
+ int i;
+ for (i = 0; i < INTELRD_RETRY; i++) {
+ if (IntelRDseed64(rnd) == 0)
+ return 0;
+ }
+ return -1;
+}
+
+/* return 0 on success */
+static int wc_GenerateSeed_IntelRD(OS_Seed* os, byte* output, word32 sz)
+{
+ int ret;
+ word64 rndTmp;
+
+ (void)os;
+
+ if (!IS_INTEL_RDSEED(intel_flags))
+ return -1;
+
+ for (; (sz / sizeof(word64)) > 0; sz -= sizeof(word64),
+ output += sizeof(word64)) {
+ ret = IntelRDseed64_r((word64*)output);
+ if (ret != 0)
+ return ret;
+ }
+ if (sz == 0)
+ return 0;
+
+ /* handle unaligned remainder */
+ ret = IntelRDseed64_r(&rndTmp);
+ if (ret != 0)
+ return ret;
+
+ XMEMCPY(output, &rndTmp, sz);
+
+ return 0;
+}
+
+#endif /* HAVE_INTEL_RDSEED */
+
+#ifdef HAVE_INTEL_RDRAND
+
+/* return 0 on success */
+static INLINE int IntelRDrand64(word64 *rnd)
+{
+ unsigned char ok;
+
+ __asm__ volatile("rdrand %0; setc %1":"=r"(*rnd), "=qm"(ok));
+
+ return (ok) ? 0 : -1;
+}
+
+/* return 0 on success */
+static INLINE int IntelRDrand64_r(word64 *rnd)
+{
+ int i;
+ for (i = 0; i < INTELRD_RETRY; i++) {
+ if (IntelRDrand64(rnd) == 0)
+ return 0;
+ }
+ return -1;
+}
+
+/* return 0 on success */
+static int wc_GenerateRand_IntelRD(OS_Seed* os, byte* output, word32 sz)
+{
+ int ret;
+ word64 rndTmp;
+
+ (void)os;
+
+ if (!IS_INTEL_RDRAND(intel_flags))
+ return -1;
+
+ for (; (sz / sizeof(word64)) > 0; sz -= sizeof(word64),
+ output += sizeof(word64)) {
+ ret = IntelRDrand64_r((word64 *)output);
+ if (ret != 0)
+ return ret;
+ }
+ if (sz == 0)
+ return 0;
+
+ /* handle unaligned remainder */
+ ret = IntelRDrand64_r(&rndTmp);
+ if (ret != 0)
+ return ret;
+
+ XMEMCPY(output, &rndTmp, sz);
+
+ return 0;
+}
+
+#endif /* HAVE_INTEL_RDRAND */
+#endif /* HAVE_INTEL_RDRAND || HAVE_INTEL_RDSEED */
+
+
+/* Begin wc_GenerateSeed Implementations */
+#if defined(CUSTOM_RAND_GENERATE_SEED)
+
+ /* Implement your own random generation function
+ * Return 0 to indicate success
+ * int rand_gen_seed(byte* output, word32 sz);
+ * #define CUSTOM_RAND_GENERATE_SEED rand_gen_seed */
+
+ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+ {
+ (void)os; /* Suppress unused arg warning */
+ return CUSTOM_RAND_GENERATE_SEED(output, sz);
+ }
+
+#elif defined(CUSTOM_RAND_GENERATE_SEED_OS)
+
+ /* Implement your own random generation function,
+ * which includes OS_Seed.
+ * Return 0 to indicate success
+ * int rand_gen_seed(OS_Seed* os, byte* output, word32 sz);
+ * #define CUSTOM_RAND_GENERATE_SEED_OS rand_gen_seed */
+
+ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+ {
+ return CUSTOM_RAND_GENERATE_SEED_OS(os, output, sz);
+ }
+
+#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 = 0;
+
+ (void)os;
+
+ while (i < sz)
+ {
+ /* If not aligned or there is odd/remainder */
+ if( (i + sizeof(CUSTOM_RAND_TYPE)) > sz ||
+ ((wolfssl_word)&output[i] % sizeof(CUSTOM_RAND_TYPE)) != 0
+ ) {
+ /* Single byte at a time */
+ output[i++] = (byte)CUSTOM_RAND_GENERATE();
+ }
+ else {
+ /* Use native 8, 16, 32 or 64 copy instruction */
+ *((CUSTOM_RAND_TYPE*)&output[i]) = CUSTOM_RAND_GENERATE();
+ i += sizeof(CUSTOM_RAND_TYPE);
+ }
+ }
+
+ return 0;
+ }
+
+#elif defined(WOLFSSL_SGX)
+
+int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+{
+ int ret = !SGX_SUCCESS;
+ int i, read_max = 10;
+
+ for (i = 0; i < read_max && ret != SGX_SUCCESS; i++) {
+ ret = sgx_read_rand(output, sz);
+ }
+
+ (void)os;
+ return (ret == SGX_SUCCESS) ? 0 : 1;
+}
+
+#elif 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(MICROCHIP_PIC32)
+
+ #ifdef MICROCHIP_MPLAB_HARMONY
+ #define PIC32_SEED_COUNT _CP0_GET_COUNT
+ #else
+ #if !defined(WOLFSSL_MICROCHIP_PIC32MZ)
+ #include <peripheral/timer.h>
+ #endif
+ extern word32 ReadCoreTimer(void);
+ #define PIC32_SEED_COUNT ReadCoreTimer
+ #endif
+
+ #ifdef WOLFSSL_PIC32MZ_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;
+
+#if ((__PIC32_FEATURE_SET0 == 'E') && (__PIC32_FEATURE_SET1 == 'C'))
+ RNGNUMGEN1 = _CP0_GET_COUNT();
+ RNGPOLY1 = _CP0_GET_COUNT();
+ RNGPOLY2 = _CP0_GET_COUNT();
+ RNGNUMGEN2 = _CP0_GET_COUNT();
+#else
+ // All others can be seeded from the TRNG
+ RNGCONbits.TRNGMODE = 1;
+ RNGCONbits.TRNGEN = 1;
+ while (RNGCNT < 64);
+ RNGCONbits.LOAD = 1;
+ while (RNGCONbits.LOAD == 1);
+ while (RNGCNT < 64);
+ RNGPOLY2 = RNGSEED2;
+ RNGPOLY1 = RNGSEED1;
+#endif
+
+ RNGCONbits.PLEN = 0x40;
+ RNGCONbits.PRNGEN = 1;
+ for (i=0; i<5; i++) { /* wait for RNGNUMGEN ready */
+ volatile int x;
+ x = RNGNUMGEN1;
+ x = RNGNUMGEN2;
+ (void)x;
+ }
+ 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_PIC32MZ_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_PIC32MZ_RNG */
+
+#elif defined(FREESCALE_MQX) || defined(FREESCALE_KSDK_MQX) || \
+ defined(FREESCALE_KSDK_BM) || defined(FREESCALE_FREE_RTOS)
+
+ #if defined(FREESCALE_K70_RNGA) || defined(FREESCALE_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 */
+ #if defined(SIM_SCGC3_RNGA_MASK)
+ SIM_SCGC3 |= SIM_SCGC3_RNGA_MASK;
+ #endif
+ #if defined(SIM_SCGC6_RNGA_MASK)
+ /* additionally needed for at least K64F */
+ SIM_SCGC6 |= SIM_SCGC6_RNGA_MASK;
+ #endif
+
+ /* 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) || defined(FREESCALE_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;
+ }
+
+ #elif defined(FREESCALE_KSDK_2_0_TRNG)
+
+ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+ {
+ status_t status;
+ status = TRNG_GetRandomData(TRNG0, output, sz);
+ if (status == kStatus_Success)
+ {
+ return(0);
+ }
+ else
+ {
+ return RAN_BLOCK_E;
+ }
+ }
+
+ #elif defined(FREESCALE_KSDK_2_0_RNGA)
+
+ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+ {
+ status_t status;
+ status = RNGA_GetRandomData(RNG, output, sz);
+ if (status == kStatus_Success)
+ {
+ return(0);
+ }
+ else
+ {
+ return RAN_BLOCK_E;
+ }
+ }
+
+
+ #elif defined(FREESCALE_RNGA)
+
+ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+ {
+ RNGA_DRV_GetRandomData(RNGA_INSTANCE, output, sz);
+ return 0;
+ }
+
+ #else
+ #define USE_TEST_GENSEED
+ #endif /* FREESCALE_K70_RNGA */
+
+#elif defined(STM32F2_RNG) || defined(STM32F4_RNG)
+ /*
+ * wc_Generate a RNG seed using the hardware random number generator
+ * on the STM32F2/F4. */
+
+ #ifdef WOLFSSL_STM32_CUBEMX
+ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+ {
+ RNG_HandleTypeDef hrng;
+ int i;
+ (void)os;
+
+ /* enable RNG clock source */
+ __HAL_RCC_RNG_CLK_ENABLE();
+
+ /* enable RNG peripheral */
+ hrng.Instance = RNG;
+ HAL_RNG_Init(&hrng);
+
+ for (i = 0; i < (int)sz; i++) {
+ /* get value */
+ output[i] = (byte)HAL_RNG_GetRandomNumber(&hrng);
+ }
+
+ return 0;
+ }
+ #else
+ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+ {
+ int i;
+ (void)os;
+
+ /* enable RNG clock source */
+ RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_RNG, ENABLE);
+
+ /* enable RNG peripheral */
+ RNG_Cmd(ENABLE);
+
+ for (i = 0; i < (int)sz; i++) {
+ /* wait until RNG number is ready */
+ while(RNG_GetFlagStatus(RNG_FLAG_DRDY)== RESET) { }
+
+ /* get value */
+ output[i] = RNG_GetRandomNumber();
+ }
+
+ return 0;
+ }
+ #endif /* WOLFSSL_STM32_CUBEMX */
+
+#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(WOLFSSL_VXWORKS)
+
+ #include <randomNumGen.h>
+
+ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz) {
+ STATUS status;
+
+ #ifdef VXWORKS_SIM
+ /* cannot generate true entropy with VxWorks simulator */
+ #warning "not enough entropy, simulator for testing only"
+ int i = 0;
+
+ for (i = 0; i < 1000; i++) {
+ randomAddTimeStamp();
+ }
+ #endif
+
+ status = randBytes (output, sz);
+ if (status == ERROR) {
+ return RNG_FAILURE_E;
+ }
+
+ return 0;
+ }
+
+#elif defined(WOLFSSL_NRF51)
+ #include "app_error.h"
+ #include "nrf_drv_rng.h"
+ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+ {
+ int remaining = sz, length, pos = 0;
+ uint8_t available;
+ uint32_t err_code;
+
+ (void)os;
+
+ /* Make sure RNG is running */
+ err_code = nrf_drv_rng_init(NULL);
+ if (err_code != NRF_SUCCESS && err_code != NRF_ERROR_INVALID_STATE) {
+ return -1;
+ }
+
+ while (remaining > 0) {
+ err_code = nrf_drv_rng_bytes_available(&available);
+ if (err_code == NRF_SUCCESS) {
+ length = (remaining < available) ? remaining : available;
+ if (length > 0) {
+ err_code = nrf_drv_rng_rand(&output[pos], length);
+ remaining -= length;
+ pos += length;
+ }
+ }
+
+ if (err_code != NRF_SUCCESS) {
+ break;
+ }
+ }
+
+ return (err_code == NRF_SUCCESS) ? 0 : -1;
+ }
+
+#elif defined(HAVE_WNR)
+
+ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+ {
+ if (os == NULL || output == NULL || wnr_ctx == NULL ||
+ wnr_timeout < 0) {
+ return BAD_FUNC_ARG;
+ }
+
+ if (wnr_mutex_init == 0) {
+ WOLFSSL_MSG("netRandom context must be created before use");
+ return RNG_FAILURE_E;
+ }
+
+ if (wc_LockMutex(&wnr_mutex) != 0) {
+ WOLFSSL_MSG("Bad Lock Mutex wnr_mutex\n");
+ return BAD_MUTEX_E;
+ }
+
+ if (wnr_get_entropy(wnr_ctx, wnr_timeout, output, sz, sz) !=
+ WNR_ERROR_NONE)
+ return RNG_FAILURE_E;
+
+ wc_UnLockMutex(&wnr_mutex);
+
+ return 0;
+ }
+
+#elif defined(WOLFSSL_ATMEL)
+ #include <wolfssl/wolfcrypt/port/atmel/atmel.h>
+
+ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+ {
+ int ret = 0;
+
+ (void)os;
+ if (output == NULL) {
+ return BUFFER_E;
+ }
+
+ ret = atmel_get_random_number(sz, output);
+
+ return ret;
+ }
+
+#elif defined(INTIME_RTOS)
+ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+ {
+ int ret = 0;
+
+ (void)os;
+
+ if (output == NULL) {
+ return BUFFER_E;
+ }
+
+ /* Note: Investigate better solution */
+ /* no return to check */
+ arc4random_buf(output, sz);
+
+ return ret;
+ }
+
+#elif defined(IDIRECT_DEV_RANDOM)
+
+ extern int getRandom( int sz, unsigned char *output );
+
+ int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+ {
+ int num_bytes_returned = 0;
+
+ num_bytes_returned = getRandom( (int) sz, (unsigned char *) output );
+
+ return 0;
+ }
+
+#elif defined(CUSTOM_RAND_GENERATE_BLOCK)
+ /* #define CUSTOM_RAND_GENERATE_BLOCK myRngFunc
+ * extern int myRngFunc(byte* output, word32 sz);
+ */
+
+#elif defined(WOLFSSL_SAFERTOS) || defined(WOLFSSL_LEANPSK) || \
+ defined(WOLFSSL_IAR_ARM) || defined(WOLFSSL_MDK_ARM) || \
+ defined(WOLFSSL_uITRON4) || defined(WOLFSSL_uTKERNEL2) || \
+ defined(WOLFSSL_LPC43xx) || defined(WOLFSSL_STM32F2xx) || \
+ defined(MBED) || defined(WOLFSSL_EMBOS) || \
+ defined(WOLFSSL_GENSEED_FORTEST)
+
+ /* these platforms do not have a default random seed and
+ you'll need to implement your own wc_GenerateSeed or define via
+ CUSTOM_RAND_GENERATE_BLOCK */
+
+ #define USE_TEST_GENSEED
+
+#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
+
+ /* may block */
+ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+ {
+ int ret = 0;
+
+ #ifdef HAVE_INTEL_RDSEED
+ if (IS_INTEL_RDSEED(intel_flags)) {
+ ret = wc_GenerateSeed_IntelRD(NULL, output, sz);
+ if (ret == 0) {
+ /* success, we're done */
+ return ret;
+ }
+ #ifdef FORCE_FAILURE_RDSEED
+ /* don't fallback to /dev/urandom */
+ return ret;
+ #else
+ /* fallback to /dev/urandom attempt */
+ ret = 0;
+ #endif
+ }
+
+ #endif /* HAVE_INTEL_RDSEED */
+
+ 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
+
+#ifdef USE_TEST_GENSEED
+ #ifndef _MSC_VER
+ #warning "write a real random seed!!!!, just for testing now"
+ #else
+ #pragma message("Warning: write a real random seed!!!!, just for testing now")
+ #endif
+
+ 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;
+ }
+#endif
+
+/* End wc_GenerateSeed */
+
+#endif /* WC_NO_RNG */
+#endif /* HAVE_FIPS */
+