/* ====================================================================

 * Copyright (c) 2011 The OpenSSL Project.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer. 

 *

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in

 *    the documentation and/or other materials provided with the

 *    distribution.

 *

 * 3. All advertising materials mentioning features or use of this

 *    software must display the following acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    openssl-core@openssl.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

 * OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 */

/* If we don't define _XOPEN_SOURCE_EXTENDED, struct timeval won't

   be defined and gettimeofday() won't be declared with strict compilers

   like DEC C in ANSI C mode.  */

#ifndef _XOPEN_SOURCE_EXTENDED

# define _XOPEN_SOURCE_EXTENDED 1

#endif

#include <openssl/crypto.h>

#include <openssl/rand.h>

#include <openssl/err.h>

#include <openssl/fips.h>

#include "crypto/fips.h"

#include <openssl/fips_rand.h>

#include "e_os.h"

#if !(defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VXWORKS))

# include <sys/time.h>

#endif

#if defined(OPENSSL_SYS_VXWORKS)

# include <time.h>

#endif

#ifndef OPENSSL_SYS_WIN32

# ifdef OPENSSL_UNISTD

#  include OPENSSL_UNISTD

# else

#  include <unistd.h>

# endif

#endif

/* FIPS API for PRNG use. Similar to RAND functionality but without

 * ENGINE and additional checking for non-FIPS rand methods.

 */

static const RAND_METHOD *fips_rand_meth = NULL;

static int fips_approved_rand_meth = 0;

static int fips_rand_bits = 0;

/* Allows application to override number of bits and uses non-FIPS methods */

void FIPS_rand_set_bits(int nbits)

{

    fips_rand_bits = nbits;

}

int FIPS_rand_set_method(const RAND_METHOD *meth)

{

    if (!fips_rand_bits) {

        if (meth == FIPS_drbg_method())

            fips_approved_rand_meth = 1;

        else {

            fips_approved_rand_meth = 0;

            if (FIPS_module_mode()) {

                FIPSerr(FIPS_F_FIPS_RAND_SET_METHOD, FIPS_R_NON_FIPS_METHOD);

                return 0;

            }

        }

    }

    fips_rand_meth = meth;

    return 1;

}

const RAND_METHOD *FIPS_rand_get_method(void)

{

    return fips_rand_meth;

}

void FIPS_rand_reset(void)

{

    if (fips_rand_meth && fips_rand_meth->cleanup)

        fips_rand_meth->cleanup();

}

int FIPS_rand_seed(const void *buf, int num)

{

#if 0

    if (!fips_approved_rand_meth && FIPS_module_mode()) {

        FIPSerr(FIPS_F_FIPS_RAND_SEED, FIPS_R_NON_FIPS_METHOD);

        return 0;

    }

    if (fips_rand_meth && fips_rand_meth->seed)

        fips_rand_meth->seed(buf, num);

    return 1;

#else

    RAND_seed(buf, num);

    return 1;

#endif

}

int FIPS_rand_bytes(unsigned char *buf, int num)

{

#if 0

    if (!fips_approved_rand_meth && FIPS_module_mode()) {

        FIPSerr(FIPS_F_FIPS_RAND_BYTES, FIPS_R_NON_FIPS_METHOD);

        return 0;

    }

    if (fips_rand_meth && fips_rand_meth->bytes)

        return fips_rand_meth->bytes(buf, num);

    return 0;

#else

    return RAND_bytes(buf, num);

#endif

}

int FIPS_rand_status(void)

{

#if 0

    if (!fips_approved_rand_meth && FIPS_module_mode()) {

        FIPSerr(FIPS_F_FIPS_RAND_STATUS, FIPS_R_NON_FIPS_METHOD);

        return 0;

    }

    if (fips_rand_meth && fips_rand_meth->status)

        return fips_rand_meth->status();

    return 0;

#else

    return RAND_status();

#endif

}

/* Return instantiated strength of PRNG. For DRBG this is an internal

 * parameter. Any other type of PRNG is not approved and returns 0 in

 * FIPS mode and maximum 256 outside FIPS mode.

 */

int FIPS_rand_strength(void)

{

    if (fips_rand_bits)

        return fips_rand_bits;

    if (fips_approved_rand_meth == 1)

        return FIPS_drbg_get_strength(FIPS_get_default_drbg());

    else if (fips_approved_rand_meth == 0) {

        if (FIPS_module_mode())

            return 0;

        else

            return 256;

    }

    return 0;

}

void FIPS_get_timevec(unsigned char *buf, unsigned long *pctr)

{

# ifdef OPENSSL_SYS_WIN32

    FILETIME ft;

# elif defined(OPENSSL_SYS_VXWORKS)

    struct timespec ts;

# else

    struct timeval tv;

# endif

# ifndef GETPID_IS_MEANINGLESS

    unsigned long pid;

# endif

# ifdef OPENSSL_SYS_WIN32

    GetSystemTimeAsFileTime(&ft;;

    buf[0] = (unsigned char)(ft.dwHighDateTime & 0xff);

    buf[1] = (unsigned char)((ft.dwHighDateTime >> 8) & 0xff);

    buf[2] = (unsigned char)((ft.dwHighDateTime >> 16) & 0xff);

    buf[3] = (unsigned char)((ft.dwHighDateTime >> 24) & 0xff);

    buf[4] = (unsigned char)(ft.dwLowDateTime & 0xff);

    buf[5] = (unsigned char)((ft.dwLowDateTime >> 8) & 0xff);

    buf[6] = (unsigned char)((ft.dwLowDateTime >> 16) & 0xff);

    buf[7] = (unsigned char)((ft.dwLowDateTime >> 24) & 0xff);

# elif defined(OPENSSL_SYS_VXWORKS)

    clock_gettime(CLOCK_REALTIME, &ts);

    buf[0] = (unsigned char)(ts.tv_sec & 0xff);

    buf[1] = (unsigned char)((ts.tv_sec >> 8) & 0xff);

    buf[2] = (unsigned char)((ts.tv_sec >> 16) & 0xff);

    buf[3] = (unsigned char)((ts.tv_sec >> 24) & 0xff);

    buf[4] = (unsigned char)(ts.tv_nsec & 0xff);

    buf[5] = (unsigned char)((ts.tv_nsec >> 8) & 0xff);

    buf[6] = (unsigned char)((ts.tv_nsec >> 16) & 0xff);

    buf[7] = (unsigned char)((ts.tv_nsec >> 24) & 0xff);

# else

    gettimeofday(&tv, NULL);

    buf[0] = (unsigned char)(tv.tv_sec & 0xff);

    buf[1] = (unsigned char)((tv.tv_sec >> 8) & 0xff);

    buf[2] = (unsigned char)((tv.tv_sec >> 16) & 0xff);

    buf[3] = (unsigned char)((tv.tv_sec >> 24) & 0xff);

    buf[4] = (unsigned char)(tv.tv_usec & 0xff);

    buf[5] = (unsigned char)((tv.tv_usec >> 8) & 0xff);

    buf[6] = (unsigned char)((tv.tv_usec >> 16) & 0xff);

    buf[7] = (unsigned char)((tv.tv_usec >> 24) & 0xff);

# endif

    buf[8] = (unsigned char)(*pctr & 0xff);

    buf[9] = (unsigned char)((*pctr >> 8) & 0xff);

    buf[10] = (unsigned char)((*pctr >> 16) & 0xff);

    buf[11] = (unsigned char)((*pctr >> 24) & 0xff);

    (*pctr)++;

# ifndef GETPID_IS_MEANINGLESS

    pid = (unsigned long)getpid();

    buf[12] = (unsigned char)(pid & 0xff);

    buf[13] = (unsigned char)((pid >> 8) & 0xff);

    buf[14] = (unsigned char)((pid >> 16) & 0xff);

    buf[15] = (unsigned char)((pid >> 24) & 0xff);

# endif

}