Diff: ctaocrypt/src/random.c

Revision:

0:b86d15c6ba29

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ctaocrypt/src/random.c	Mon Jan 19 21:45:42 2015 +0000
@@ -0,0 +1,996 @@
+/* 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 */
+