Francois Berder
fork of cyassl-lib
Dependents: TLS_cyassl TLS_cyassl
Diff: ctaocrypt/src/random.c
- Revision:
- 0:714293de3836
diff -r 000000000000 -r 714293de3836 ctaocrypt/src/random.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ctaocrypt/src/random.c Thu Sep 05 10:33:04 2013 +0000
@@ -0,0 +1,637 @@
+/* random.c
+ *
+ * Copyright (C) 2006-2013 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#ifdef HAVE_CONFIG_H
+ #include <config.h>
+#endif
+
+/* on HPUX 11 you may need to install /dev/random see
+ http://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=KRNG11I
+
+*/
+
+#include <cyassl/ctaocrypt/random.h>
+#include <cyassl/ctaocrypt/ctaoerror2.h>
+
+#ifdef NO_RC4
+ #include <cyassl/ctaocrypt/sha256.h>
+
+ #ifdef NO_INLINE
+ #include <cyassl/ctaocrypt/misc.h>
+ #else
+ #define MISC_DUMM_FUNC misc_dummy_random
+ #include <ctaocrypt/src/misc.c>
+ #endif
+#endif
+
+#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)
+ #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 NO_RC4
+
+/* Start NIST DRBG code */
+
+#define OUTPUT_BLOCK_LEN (256/8)
+#define MAX_REQUEST_LEN (0x1000)
+#define MAX_STRING_LEN (0x100000000)
+#define RESEED_MAX (0x100000000000LL)
+#define ENTROPY_SZ 256
+
+#define DBRG_SUCCESS 0
+#define DBRG_ERROR 1
+#define DBRG_NEED_RESEED 2
+
+
+enum {
+ dbrgInitC = 0,
+ dbrgReseed = 1,
+ dbrgGenerateW = 2,
+ dbrgGenerateH = 3,
+ dbrgInitV
+};
+
+
+static int Hash_df(RNG* rng, byte* out, word32 outSz, byte type, byte* inA, word32 inASz,
+ byte* inB, word32 inBSz, byte* inC, word32 inCSz)
+{
+ byte ctr;
+ int i;
+ int len;
+ word32 bits = (outSz * 8); /* reverse byte order */
+
+ #ifdef LITTLE_ENDIAN_ORDER
+ bits = ByteReverseWord32(bits);
+ #endif
+ len = (outSz / SHA256_DIGEST_SIZE)
+ + ((outSz % SHA256_DIGEST_SIZE) ? 1 : 0);
+
+ for (i = 0, ctr = 1; i < len; i++, ctr++)
+ {
+ InitSha256(&rng->sha);
+ Sha256Update(&rng->sha, &ctr, sizeof(ctr));
+ Sha256Update(&rng->sha, (byte*)&bits, sizeof(bits));
+ /* churning V is the only string that doesn't have
+ * the type added */
+ if (type != dbrgInitV)
+ Sha256Update(&rng->sha, &type, sizeof(type));
+ Sha256Update(&rng->sha, inA, inASz);
+ if (inB != NULL && inBSz > 0)
+ Sha256Update(&rng->sha, inB, inBSz);
+ if (inC != NULL && inCSz > 0)
+ Sha256Update(&rng->sha, inC, inCSz);
+ Sha256Final(&rng->sha, rng->digest);
+
+ if (outSz > SHA256_DIGEST_SIZE) {
+ XMEMCPY(out, rng->digest, SHA256_DIGEST_SIZE);
+ outSz -= SHA256_DIGEST_SIZE;
+ out += SHA256_DIGEST_SIZE;
+ }
+ else {
+ XMEMCPY(out, rng->digest, outSz);
+ }
+ }
+
+ return DBRG_SUCCESS;
+}
+
+
+static int Hash_DBRG_Reseed(RNG* rng, byte* entropy, word32 entropySz)
+{
+ byte seed[DBRG_SEED_LEN];
+
+ Hash_df(rng, seed, sizeof(seed), dbrgInitV, rng->V, sizeof(rng->V),
+ entropy, entropySz, NULL, 0);
+ XMEMCPY(rng->V, seed, sizeof(rng->V));
+ XMEMSET(seed, 0, sizeof(seed));
+
+ Hash_df(rng, rng->C, sizeof(rng->C), dbrgInitC, rng->V, sizeof(rng->V),
+ NULL, 0, NULL, 0);
+ rng->reseed_ctr = 1;
+ return 0;
+}
+
+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;
+ }
+}
+
+static void Hash_gen(RNG* rng, byte* out, word32 outSz, byte* V)
+{
+ byte data[DBRG_SEED_LEN];
+ int i;
+ int len = (outSz / SHA256_DIGEST_SIZE)
+ + ((outSz % SHA256_DIGEST_SIZE) ? 1 : 0);
+
+ XMEMCPY(data, V, sizeof(data));
+ for (i = 0; i < len; i++) {
+ InitSha256(&rng->sha);
+ Sha256Update(&rng->sha, data, sizeof(data));
+ Sha256Final(&rng->sha, rng->digest);
+ if (outSz > SHA256_DIGEST_SIZE) {
+ XMEMCPY(out, rng->digest, SHA256_DIGEST_SIZE);
+ outSz -= SHA256_DIGEST_SIZE;
+ out += SHA256_DIGEST_SIZE;
+ array_add_one(data, DBRG_SEED_LEN);
+ }
+ else {
+ XMEMCPY(out, rng->digest, outSz);
+ }
+ }
+ XMEMSET(data, 0, sizeof(data));
+}
+
+
+static INLINE void array_add(byte* d, word32 dLen, byte* s, word32 sLen)
+{
+ word16 carry = 0;
+
+ if (dLen > 0 && sLen > 0 && dLen >= sLen) {
+ int sIdx, dIdx;
+
+ for (sIdx = sLen - 1, dIdx = dLen - 1; sIdx >= 0; dIdx--, sIdx--)
+ {
+ carry += d[dIdx] + s[sIdx];
+ d[dIdx] = carry;
+ carry >>= 8;
+ }
+ if (dIdx > 0)
+ d[dIdx] += carry;
+ }
+}
+
+
+static int Hash_DBRG_Generate(RNG* rng, byte* out, word32 outSz)
+{
+ int ret;
+
+ if (rng->reseed_ctr != RESEED_MAX) {
+ byte type = dbrgGenerateH;
+
+ Hash_gen(rng, out, outSz, rng->V);
+ InitSha256(&rng->sha);
+ Sha256Update(&rng->sha, &type, sizeof(type));
+ Sha256Update(&rng->sha, rng->V, sizeof(rng->V));
+ Sha256Final(&rng->sha, rng->digest);
+ array_add(rng->V, sizeof(rng->V), rng->digest, sizeof(rng->digest));
+ array_add(rng->V, sizeof(rng->V), rng->C, sizeof(rng->C));
+ array_add(rng->V, sizeof(rng->V),
+ (byte*)&rng->reseed_ctr, sizeof(rng->reseed_ctr));
+ rng->reseed_ctr++;
+ ret = DBRG_SUCCESS;
+ }
+ else {
+ ret = DBRG_NEED_RESEED;
+ }
+ return ret;
+}
+
+
+static void Hash_DBRG_Instantiate(RNG* rng, byte* seed, word32 seedSz)
+{
+ XMEMSET(rng, 0, sizeof(*rng));
+ Hash_df(rng, rng->V, sizeof(rng->V), dbrgInitV, seed, seedSz, NULL, 0, NULL, 0);
+ Hash_df(rng, rng->C, sizeof(rng->C), dbrgInitC, rng->V, sizeof(rng->V),
+ NULL, 0, NULL, 0);
+ rng->reseed_ctr = 1;
+}
+
+
+static int Hash_DBRG_Uninstantiate(RNG* rng)
+{
+ int result = DBRG_ERROR;
+
+ if (rng != NULL) {
+ XMEMSET(rng, 0, sizeof(*rng));
+ result = DBRG_SUCCESS;
+ }
+
+ return result;
+}
+
+/* End NIST DRBG Code */
+
+
+
+/* Get seed and key cipher */
+int InitRng(RNG* rng)
+{
+ byte entropy[ENTROPY_SZ];
+ int ret = DBRG_ERROR;
+
+ if (GenerateSeed(&rng->seed, entropy, sizeof(entropy)) == 0) {
+ Hash_DBRG_Instantiate(rng, entropy, sizeof(entropy));
+ ret = DBRG_SUCCESS;
+ }
+ XMEMSET(entropy, 0, sizeof(entropy));
+ return ret;
+}
+
+
+/* place a generated block in output */
+void RNG_GenerateBlock(RNG* rng, byte* output, word32 sz)
+{
+ int ret;
+
+ XMEMSET(output, 0, sz);
+ ret = Hash_DBRG_Generate(rng, output, sz);
+ if (ret == DBRG_NEED_RESEED) {
+ byte entropy[ENTROPY_SZ];
+ ret = GenerateSeed(&rng->seed, entropy, sizeof(entropy));
+ if (ret == 0) {
+ Hash_DBRG_Reseed(rng, entropy, sizeof(entropy));
+ ret = Hash_DBRG_Generate(rng, output, sz);
+ }
+ else
+ ret = DBRG_ERROR;
+ XMEMSET(entropy, 0, sizeof(entropy));
+ }
+}
+
+
+byte RNG_GenerateByte(RNG* rng)
+{
+ byte b;
+ RNG_GenerateBlock(rng, &b, 1);
+
+ return b;
+}
+
+
+void FreeRng(RNG* rng)
+{
+ Hash_DBRG_Uninstantiate(rng);
+}
+
+#else /* NO_RC4 */
+
+/* Get seed and key cipher */
+int InitRng(RNG* rng)
+{
+ byte key[32];
+ byte junk[256];
+ int ret;
+
+#ifdef HAVE_CAVIUM
+ if (rng->magic == CYASSL_RNG_CAVIUM_MAGIC)
+ return 0;
+#endif
+ ret = GenerateSeed(&rng->seed, key, sizeof(key));
+
+ if (ret == 0) {
+ Arc4SetKey(&rng->cipher, key, sizeof(key));
+ RNG_GenerateBlock(rng, junk, sizeof(junk)); /* rid initial state */
+ }
+
+ return ret;
+}
+
+#ifdef HAVE_CAVIUM
+ static void CaviumRNG_GenerateBlock(RNG* rng, byte* output, word32 sz);
+#endif
+
+/* place a generated block in output */
+void 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);
+}
+
+
+byte RNG_GenerateByte(RNG* rng)
+{
+ byte b;
+ RNG_GenerateBlock(rng, &b, 1);
+
+ return b;
+}
+
+
+#ifdef HAVE_CAVIUM
+
+#include <cyassl/ctaocrypt/logging.h>
+#include "cavium_common.h"
+
+/* Initiliaze RNG for use with Nitrox device */
+int InitRngCavium(RNG* rng, int devId)
+{
+ if (rng == NULL)
+ return -1;
+
+ rng->devId = devId;
+ rng->magic = CYASSL_RNG_CAVIUM_MAGIC;
+
+ return 0;
+}
+
+
+static void CaviumRNG_GenerateBlock(RNG* rng, byte* output, word32 sz)
+{
+ word offset = 0;
+ word32 requestId;
+
+ while (sz > CYASSL_MAX_16BIT) {
+ word16 slen = (word16)CYASSL_MAX_16BIT;
+ if (CspRandom(CAVIUM_BLOCKING, slen, output + offset, &requestId,
+ rng->devId) != 0) {
+ CYASSL_MSG("Cavium RNG failed");
+ }
+ sz -= CYASSL_MAX_16BIT;
+ offset += CYASSL_MAX_16BIT;
+ }
+ if (sz) {
+ word16 slen = (word16)sz;
+ if (CspRandom(CAVIUM_BLOCKING, slen, output + offset, &requestId,
+ rng->devId) != 0) {
+ CYASSL_MSG("Cavium RNG failed");
+ }
+ }
+}
+
+#endif /* HAVE_CAVIUM */
+
+#endif /* 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)
+
+#include <peripheral/timer.h>
+
+/* uses the core timer, in nanoseconds to seed srand */
+int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
+{
+ int i;
+ srand(ReadCoreTimer() * 25);
+
+ for (i = 0; i < sz; i++ ) {
+ output[i] = rand() % 256;
+ if ( (i % 8) == 7)
+ srand(ReadCoreTimer() * 25);
+ }
+
+ return 0;
+}
+
+#elif defined(CYASSL_SAFERTOS) || defined(CYASSL_LEANPSK)
+
+#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(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;
+ }
+ #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(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(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 */
+