path: root/openssl/crypto/cryptlib.c

/* crypto/cryptlib.c */
/* ====================================================================
 * Copyright (c) 1998-2006 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 * ECDH support in OpenSSL originally developed by
 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
 */

#include "cryptlib.h"
#include <openssl/safestack.h>

#if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_WIN16)
static double SSLeay_MSVC5_hack = 0.0; /* and for VC1.5 */
#endif

DECLARE_STACK_OF(CRYPTO_dynlock)

/* real #defines in crypto.h, keep these upto date */
static const char *const lock_names[CRYPTO_NUM_LOCKS] = {
    "<<ERROR>>",
    "err",
    "ex_data",
    "x509",
    "x509_info",
    "x509_pkey",
    "x509_crl",
    "x509_req",
    "dsa",
    "rsa",
    "evp_pkey",
    "x509_store",
    "ssl_ctx",
    "ssl_cert",
    "ssl_session",
    "ssl_sess_cert",
    "ssl",
    "ssl_method",
    "rand",
    "rand2",
    "debug_malloc",
    "BIO",
    "gethostbyname",
    "getservbyname",
    "readdir",
    "RSA_blinding",
    "dh",
    "debug_malloc2",
    "dso",
    "dynlock",
    "engine",
    "ui",
    "ecdsa",
    "ec",
    "ecdh",
    "bn",
    "ec_pre_comp",
    "store",
    "comp",
    "fips",
    "fips2",
#if CRYPTO_NUM_LOCKS != 41
# error "Inconsistency between crypto.h and cryptlib.c"
#endif
};

/*
 * This is for applications to allocate new type names in the non-dynamic
 * array of lock names.  These are numbered with positive numbers.
 */
static STACK_OF(OPENSSL_STRING) *app_locks = NULL;

/*
 * For applications that want a more dynamic way of handling threads, the
 * following stack is used.  These are externally numbered with negative
 * numbers.
 */
static STACK_OF(CRYPTO_dynlock) *dyn_locks = NULL;

static void (MS_FAR *locking_callback) (int mode, int type,
                                        const char *file, int line) = 0;
static int (MS_FAR *add_lock_callback) (int *pointer, int amount,
                                        int type, const char *file,
                                        int line) = 0;
#ifndef OPENSSL_NO_DEPRECATED
static unsigned long (MS_FAR *id_callback) (void) = 0;
#endif
static void (MS_FAR *threadid_callback) (CRYPTO_THREADID *) = 0;
static struct CRYPTO_dynlock_value *(MS_FAR *dynlock_create_callback)
 (const char *file, int line) = 0;
static void (MS_FAR *dynlock_lock_callback) (int mode,
                                             struct CRYPTO_dynlock_value *l,
                                             const char *file, int line) = 0;
static void (MS_FAR *dynlock_destroy_callback) (struct CRYPTO_dynlock_value
                                                *l, const char *file,
                                                int line) = 0;

int CRYPTO_get_new_lockid(char *name)
{
    char *str;
    int i;

#if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_WIN16)
    /*
     * A hack to make Visual C++ 5.0 work correctly when linking as a DLL
     * using /MT. Without this, the application cannot use any floating point
     * printf's. It also seems to be needed for Visual C 1.5 (win16)
     */
    SSLeay_MSVC5_hack = (double)name[0] * (double)name[1];
#endif

    if ((app_locks == NULL)
        && ((app_locks = sk_OPENSSL_STRING_new_null()) == NULL)) {
        CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID, ERR_R_MALLOC_FAILURE);
        return (0);
    }
    if ((str = BUF_strdup(name)) == NULL) {
        CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID, ERR_R_MALLOC_FAILURE);
        return (0);
    }
    i = sk_OPENSSL_STRING_push(app_locks, str);
    if (!i)
        OPENSSL_free(str);
    else
        i += CRYPTO_NUM_LOCKS;  /* gap of one :-) */
    return (i);
}

int CRYPTO_num_locks(void)
{
    return CRYPTO_NUM_LOCKS;
}

int CRYPTO_get_new_dynlockid(void)
{
    int i = 0;
    CRYPTO_dynlock *pointer = NULL;

    if (dynlock_create_callback == NULL) {
        CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,
                  CRYPTO_R_NO_DYNLOCK_CREATE_CALLBACK);
        return (0);
    }
    CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
    if ((dyn_locks == NULL)
        && ((dyn_locks = sk_CRYPTO_dynlock_new_null()) == NULL)) {
        CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
        CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID, ERR_R_MALLOC_FAILURE);
        return (0);
    }
    CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);

    pointer = (CRYPTO_dynlock *) OPENSSL_malloc(sizeof(CRYPTO_dynlock));
    if (pointer == NULL) {
        CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID, ERR_R_MALLOC_FAILURE);
        return (0);
    }
    pointer->references = 1;
    pointer->data = dynlock_create_callback(__FILE__, __LINE__);
    if (pointer->data == NULL) {
        OPENSSL_free(pointer);
        CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID, ERR_R_MALLOC_FAILURE);
        return (0);
    }

    CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
    /* First, try to find an existing empty slot */
    i = sk_CRYPTO_dynlock_find(dyn_locks, NULL);
    /* If there was none, push, thereby creating a new one */
    if (i == -1)
        /*
         * Since sk_push() returns the number of items on the stack, not the
         * location of the pushed item, we need to transform the returned
         * number into a position, by decreasing it.
         */
        i = sk_CRYPTO_dynlock_push(dyn_locks, pointer) - 1;
    else
        /*
         * If we found a place with a NULL pointer, put our pointer in it.
         */
        (void)sk_CRYPTO_dynlock_set(dyn_locks, i, pointer);
    CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);

    if (i == -1) {
        dynlock_destroy_callback(pointer->data, __FILE__, __LINE__);
        OPENSSL_free(pointer);
    } else
        i += 1;                 /* to avoid 0 */
    return -i;
}

void CRYPTO_destroy_dynlockid(int i)
{
    CRYPTO_dynlock *pointer = NULL;
    if (i)
        i = -i - 1;
    if (dynlock_destroy_callback == NULL)
        return;

    CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);

    if (dyn_locks == NULL || i >= sk_CRYPTO_dynlock_num(dyn_locks)) {
        CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
        return;
    }
    pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
    if (pointer != NULL) {
        --pointer->references;
#ifdef REF_CHECK
        if (pointer->references < 0) {
            fprintf(stderr,
                    "CRYPTO_destroy_dynlockid, bad reference count\n");
            abort();
        } else
#endif
        if (pointer->references <= 0) {
            (void)sk_CRYPTO_dynlock_set(dyn_locks, i, NULL);
        } else
            pointer = NULL;
    }
    CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);

    if (pointer) {
        dynlock_destroy_callback(pointer->data, __FILE__, __LINE__);
        OPENSSL_free(pointer);
    }
}

struct CRYPTO_dynlock_value *CRYPTO_get_dynlock_value(int i)
{
    CRYPTO_dynlock *pointer = NULL;
    if (i)
        i = -i - 1;

    CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);

    if (dyn_locks != NULL && i < sk_CRYPTO_dynlock_num(dyn_locks))
        pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
    if (pointer)
        pointer->references++;

    CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);

    if (pointer)
        return pointer->data;
    return NULL;
}

struct CRYPTO_dynlock_value *(*CRYPTO_get_dynlock_create_callback(void))
 (const char *file, int line) {
    return (dynlock_create_callback);
}

void (*CRYPTO_get_dynlock_lock_callback(void)) (int mode,
                                                struct CRYPTO_dynlock_value
                                                *l, const char *file,
                                                int line) {
    return (dynlock_lock_callback);
}

void (*CRYPTO_get_dynlock_destroy_callback(void))
 (struct CRYPTO_dynlock_value *l, const char *file, int line) {
    return (dynlock_destroy_callback);
}

void CRYPTO_set_dynlock_create_callback(struct CRYPTO_dynlock_value *(*func)
                                         (const char *file, int line))
{
    dynlock_create_callback = func;
}

void CRYPTO_set_dynlock_lock_callback(void (*func) (int mode,
                                                    struct
                                                    CRYPTO_dynlock_value *l,
                                                    const char *file,
                                                    int line))
{
    dynlock_lock_callback = func;
}

void CRYPTO_set_dynlock_destroy_callback(void (*func)
                                          (struct CRYPTO_dynlock_value *l,
                                           const char *file, int line))
{
    dynlock_destroy_callback = func;
}

void (*CRYPTO_get_locking_callback(void)) (int mode, int type,
                                           const char *file, int line) {
    return (locking_callback);
}

int (*CRYPTO_get_add_lock_callback(void)) (int *num, int mount, int type,
                                           const char *file, int line) {
    return (add_lock_callback);
}

void CRYPTO_set_locking_callback(void (*func) (int mode, int type,
                                               const char *file, int line))
{
    /*
     * Calling this here ensures initialisation before any threads are
     * started.
     */
    OPENSSL_init();
    locking_callback = func;
}

void CRYPTO_set_add_lock_callback(int (*func) (int *num, int mount, int type,
                                               const char *file, int line))
{
    add_lock_callback = func;
}

/*
 * the memset() here and in set_pointer() seem overkill, but for the sake of
 * CRYPTO_THREADID_cmp() this avoids any platform silliness that might cause
 * two "equal" THREADID structs to not be memcmp()-identical.
 */
void CRYPTO_THREADID_set_numeric(CRYPTO_THREADID *id, unsigned long val)
{
    memset(id, 0, sizeof(*id));
    id->val = val;
}

static const unsigned char hash_coeffs[] = { 3, 5, 7, 11, 13, 17, 19, 23 };

void CRYPTO_THREADID_set_pointer(CRYPTO_THREADID *id, void *ptr)
{
    unsigned char *dest = (void *)&id->val;
    unsigned int accum = 0;
    unsigned char dnum = sizeof(id->val);

    memset(id, 0, sizeof(*id));
    id->ptr = ptr;
    if (sizeof(id->val) >= sizeof(id->ptr)) {
        /*
         * 'ptr' can be embedded in 'val' without loss of uniqueness
         */
        id->val = (unsigned long)id->ptr;
        return;
    }
    /*
     * hash ptr ==> val. Each byte of 'val' gets the mod-256 total of a
     * linear function over the bytes in 'ptr', the co-efficients of which
     * are a sequence of low-primes (hash_coeffs is an 8-element cycle) - the
     * starting prime for the sequence varies for each byte of 'val' (unique
     * polynomials unless pointers are >64-bit). For added spice, the totals
     * accumulate rather than restarting from zero, and the index of the
     * 'val' byte is added each time (position dependence). If I was a
     * black-belt, I'd scan big-endian pointers in reverse to give low-order
     * bits more play, but this isn't crypto and I'd prefer nobody mistake it
     * as such. Plus I'm lazy.
     */
    while (dnum--) {
        const unsigned char *src = (void *)&id->ptr;
        unsigned char snum = sizeof(id->ptr);
        while (snum--)
            accum += *(src++) * hash_coeffs[(snum + dnum) & 7];
        accum += dnum;
        *(dest++) = accum & 255;
    }
}

int CRYPTO_THREADID_set_callback(void (*func) (CRYPTO_THREADID *))
{
    if (threadid_callback)
        return 0;
    threadid_callback = func;
    return 1;
}

void (*CRYPTO_THREADID_get_callback(void)) (CRYPTO_THREADID *) {
    return threadid_callback;
}

void CRYPTO_THREADID_current(CRYPTO_THREADID *id)
{
    if (threadid_callback) {
        threadid_callback(id);
        return;
    }
#ifndef OPENSSL_NO_DEPRECATED
    /* If the deprecated callback was set, fall back to that */
    if (id_callback) {
        CRYPTO_THREADID_set_numeric(id, id_callback());
        return;
    }
#endif
    /* Else pick a backup */
#ifdef OPENSSL_SYS_WIN16
    CRYPTO_THREADID_set_numeric(id, (unsigned long)GetCurrentTask());
#elif defined(OPENSSL_SYS_WIN32)
    CRYPTO_THREADID_set_numeric(id, (unsigned long)GetCurrentThreadId());
#elif defined(OPENSSL_SYS_BEOS)
    CRYPTO_THREADID_set_numeric(id, (unsigned long)find_thread(NULL));
#else
    /* For everything else, default to using the address of 'errno' */
    CRYPTO_THREADID_set_pointer(id, (void *)&errno);
#endif
}

int CRYPTO_THREADID_cmp(const CRYPTO_THREADID *a, const CRYPTO_THREADID *b)
{
    return memcmp(a, b, sizeof(*a));
}

void CRYPTO_THREADID_cpy(CRYPTO_THREADID *dest, const CRYPTO_THREADID *src)
{
    memcpy(dest, src, sizeof(*src));
}

unsigned long CRYPTO_THREADID_hash(const CRYPTO_THREADID *id)
{
    return id->val;
}

#ifndef OPENSSL_NO_DEPRECATED
unsigned long (*CRYPTO_get_id_callback(void)) (void) {
    return (id_callback);
}

void CRYPTO_set_id_callback(unsigned long (*func) (void))
{
    id_callback = func;
}

unsigned long CRYPTO_thread_id(void)
{
    unsigned long ret = 0;

    if (id_callback == NULL) {
# ifdef OPENSSL_SYS_WIN16
        ret = (unsigned long)GetCurrentTask();
# elif defined(OPENSSL_SYS_WIN32)
        ret = (unsigned long)GetCurrentThreadId();
# elif defined(GETPID_IS_MEANINGLESS)
        ret = 1L;
# elif defined(OPENSSL_SYS_BEOS)
        ret = (unsigned long)find_thread(NULL);
# else
        ret = (unsigned long)getpid();
# endif
    } else
        ret = id_callback();
    return (ret);
}
#endif

void CRYPTO_lock(int mode, int type, const char *file, int line)
{
#ifdef LOCK_DEBUG
    {
        CRYPTO_THREADID id;
        char *rw_text, *operation_text;

        if (mode & CRYPTO_LOCK)
            operation_text = "lock  ";
        else if (mode & CRYPTO_UNLOCK)
            operation_text = "unlock";
        else
            operation_text = "ERROR ";

        if (mode & CRYPTO_READ)
            rw_text = "r";
        else if (mode & CRYPTO_WRITE)
            rw_text = "w";
        else
            rw_text = "ERROR";

        CRYPTO_THREADID_current(&id);
        fprintf(stderr, "lock:%08lx:(%s)%s %-18s %s:%d\n",
                CRYPTO_THREADID_hash(&id), rw_text, operation_text,
                CRYPTO_get_lock_name(type), file, line);
    }
#endif
    if (type < 0) {
        if (dynlock_lock_callback != NULL) {
            struct CRYPTO_dynlock_value *pointer
                = CRYPTO_get_dynlock_value(type);

            OPENSSL_assert(pointer != NULL);

            dynlock_lock_callback(mode, pointer, file, line);

            CRYPTO_destroy_dynlockid(type);
        }
    } else if (locking_callback != NULL)
        locking_callback(mode, type, file, line);
}

int CRYPTO_add_lock(int *pointer, int amount, int type, const char *file,
                    int line)
{
    int ret = 0;

    if (add_lock_callback != NULL) {
#ifdef LOCK_DEBUG
        int before = *pointer;
#endif

        ret = add_lock_callback(pointer, amount, type, file, line);
#ifdef LOCK_DEBUG
        {
            CRYPTO_THREADID id;
            CRYPTO_THREADID_current(&id);
            fprintf(stderr, "ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
                    CRYPTO_THREADID_hash(&id), before, amount, ret,
                    CRYPTO_get_lock_name(type), file, line);
        }
#endif
    } else {
        CRYPTO_lock(CRYPTO_LOCK | CRYPTO_WRITE, type, file, line);

        ret = *pointer + amount;
#ifdef LOCK_DEBUG
        {
            CRYPTO_THREADID id;
            CRYPTO_THREADID_current(&id);
            fprintf(stderr, "ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
                    CRYPTO_THREADID_hash(&id),
                    *pointer, amount, ret,
                    CRYPTO_get_lock_name(type), file, line);
        }
#endif
        *pointer = ret;
        CRYPTO_lock(CRYPTO_UNLOCK | CRYPTO_WRITE, type, file, line);
    }
    return (ret);
}

const char *CRYPTO_get_lock_name(int type)
{
    if (type < 0)
        return ("dynamic");
    else if (type < CRYPTO_NUM_LOCKS)
        return (lock_names[type]);
    else if (type - CRYPTO_NUM_LOCKS > sk_OPENSSL_STRING_num(app_locks))
        return ("ERROR");
    else
        return (sk_OPENSSL_STRING_value(app_locks, type - CRYPTO_NUM_LOCKS));
}

#if     defined(__i386)   || defined(__i386__)   || defined(_M_IX86) || \
        defined(__INTEL__) || \
        defined(__x86_64) || defined(__x86_64__) || \
        defined(_M_AMD64) || defined(_M_X64)

extern unsigned int OPENSSL_ia32cap_P[4];
unsigned long *OPENSSL_ia32cap_loc(void)
{
    if (sizeof(long) == 4)
        /*
         * If 32-bit application pulls address of OPENSSL_ia32cap_P[0]
         * clear second element to maintain the illusion that vector
         * is 32-bit.
         */
        OPENSSL_ia32cap_P[1] = 0;

    OPENSSL_ia32cap_P[2] = 0;

    return (unsigned long *)OPENSSL_ia32cap_P;
}

# if defined(OPENSSL_CPUID_OBJ) && !defined(OPENSSL_NO_ASM) && !defined(I386_ONLY)
#  define OPENSSL_CPUID_SETUP
#  if defined(_WIN32)
typedef unsigned __int64 IA32CAP;
#  else
typedef unsigned long long IA32CAP;
#  endif
void OPENSSL_cpuid_setup(void)
{
    static int trigger = 0;
    IA32CAP OPENSSL_ia32_cpuid(unsigned int *);
    IA32CAP vec;
    char *env;

    if (trigger)
        return;

    trigger = 1;
    if ((env = getenv("OPENSSL_ia32cap"))) {
        int off = (env[0] == '~') ? 1 : 0;
#  if defined(_WIN32)
        if (!sscanf(env + off, "%I64i", &vec))
            vec = strtoul(env + off, NULL, 0);
#  else
        if (!sscanf(env + off, "%lli", (long long *)&vec))
            vec = strtoul(env + off, NULL, 0);
#  endif
        if (off)
            vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P) & ~vec;
        else if (env[0] == ':')
            vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);

        OPENSSL_ia32cap_P[2] = 0;
        if ((env = strchr(env, ':'))) {
            unsigned int vecx;
            env++;
            off = (env[0] == '~') ? 1 : 0;
            vecx = strtoul(env + off, NULL, 0);
            if (off)
                OPENSSL_ia32cap_P[2] &= ~vecx;
            else
                OPENSSL_ia32cap_P[2] = vecx;
        }
    } else
        vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);

    /*
     * |(1<<10) sets a reserved bit to signal that variable
     * was initialized already... This is to avoid interference
     * with cpuid snippets in ELF .init segment.
     */
    OPENSSL_ia32cap_P[0] = (unsigned int)((vec | (1<<10))&0xffffffff);
    OPENSSL_ia32cap_P[1] = (unsigned int)(vec >> 32);
}
# else
unsigned int OPENSSL_ia32cap_P[4];
# endif

#else
unsigned long *OPENSSL_ia32cap_loc(void)
{
    return NULL;
}
#endif
int OPENSSL_NONPIC_relocated = 0;
#if !defined(OPENSSL_CPUID_SETUP) && !defined(OPENSSL_CPUID_OBJ)
void OPENSSL_cpuid_setup(void)
{
}
#endif

#if (defined(_WIN32) || defined(__CYGWIN__)) && defined(_WINDLL)
# ifdef __CYGWIN__
/* pick DLL_[PROCESS|THREAD]_[ATTACH|DETACH] definitions */
#  include <windows.h>
/*
 * this has side-effect of _WIN32 getting defined, which otherwise is
 * mutually exclusive with __CYGWIN__...
 */
# endif

/*
 * All we really need to do is remove the 'error' state when a thread
 * detaches
 */

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
    switch (fdwReason) {
    case DLL_PROCESS_ATTACH:
        OPENSSL_cpuid_setup();
# if defined(_WIN32_WINNT)
        {
            IMAGE_DOS_HEADER *dos_header = (IMAGE_DOS_HEADER *) hinstDLL;
            IMAGE_NT_HEADERS *nt_headers;

            if (dos_header->e_magic == IMAGE_DOS_SIGNATURE) {
                nt_headers = (IMAGE_NT_HEADERS *) ((char *)dos_header
                                                   + dos_header->e_lfanew);
                if (nt_headers->Signature == IMAGE_NT_SIGNATURE &&
                    hinstDLL !=
                    (HINSTANCE) (nt_headers->OptionalHeader.ImageBase))
                    OPENSSL_NONPIC_relocated = 1;
            }
        }
# endif
        break;
    case DLL_THREAD_ATTACH:
        break;
    case DLL_THREAD_DETACH:
        break;
    case DLL_PROCESS_DETACH:
        break;
    }
    return (TRUE);
}
#endif

#if defined(_WIN32) && !defined(__CYGWIN__)
# include <tchar.h>
# include <signal.h>
# ifdef __WATCOMC__
#  if defined(_UNICODE) || defined(__UNICODE__)
#   define _vsntprintf _vsnwprintf
#  else
#   define _vsntprintf _vsnprintf
#  endif
# endif
# ifdef _MSC_VER
#  define alloca _alloca
# endif

# if defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0333
int OPENSSL_isservice(void)
{
    HWINSTA h;
    DWORD len;
    WCHAR *name;
    static union {
        void *p;
        int (*f) (void);
    } _OPENSSL_isservice = {
        NULL
    };

    if (_OPENSSL_isservice.p == NULL) {
        HANDLE h = GetModuleHandle(NULL);
        if (h != NULL)
            _OPENSSL_isservice.p = GetProcAddress(h, "_OPENSSL_isservice");
        if (_OPENSSL_isservice.p == NULL)
            _OPENSSL_isservice.p = (void *)-1;
    }

    if (_OPENSSL_isservice.p != (void *)-1)
        return (*_OPENSSL_isservice.f) ();

    (void)GetDesktopWindow();   /* return value is ignored */

    h = GetProcessWindowStation();
    if (h == NULL)
        return -1;

    if (GetUserObjectInformationW(h, UOI_NAME, NULL, 0, &len) ||
        GetLastError() != ERROR_INSUFFICIENT_BUFFER)
        return -1;

    if (len > 512)
        return -1;              /* paranoia */
    len++, len &= ~1;           /* paranoia */
    name = (WCHAR *)alloca(len + sizeof(WCHAR));
    if (!GetUserObjectInformationW(h, UOI_NAME, name, len, &len))
        return -1;

    len++, len &= ~1;           /* paranoia */
    name[len / sizeof(WCHAR)] = L'\0'; /* paranoia */
#  if 1
    /*
     * This doesn't cover "interactive" services [working with real
     * WinSta0's] nor programs started non-interactively by Task Scheduler
     * [those are working with SAWinSta].
     */
    if (wcsstr(name, L"Service-0x"))
        return 1;
#  else
    /* This covers all non-interactive programs such as services. */
    if (!wcsstr(name, L"WinSta0"))
        return 1;
#  endif
    else
        return 0;
}
# else
int OPENSSL_isservice(void)
{
    return 0;
}
# endif

void OPENSSL_showfatal(const char *fmta, ...)
{
    va_list ap;
    TCHAR buf[256];
    const TCHAR *fmt;
# ifdef STD_ERROR_HANDLE        /* what a dirty trick! */
    HANDLE h;

    if ((h = GetStdHandle(STD_ERROR_HANDLE)) != NULL &&
        GetFileType(h) != FILE_TYPE_UNKNOWN) {
        /* must be console application */
        int len;
        DWORD out;

        va_start(ap, fmta);
        len = _vsnprintf((char *)buf, sizeof(buf), fmta, ap);
        WriteFile(h, buf, len < 0 ? sizeof(buf) : (DWORD) len, &out, NULL);
        va_end(ap);
        return;
    }
# endif

    if (sizeof(TCHAR) == sizeof(char))
        fmt = (const TCHAR *)fmta;
    else
        do {
            int keepgoing;
            size_t len_0 = strlen(fmta) + 1, i;
            WCHAR *fmtw;

            fmtw = (WCHAR *)alloca(len_0 * sizeof(WCHAR));
            if (fmtw == NULL) {
                fmt = (const TCHAR *)L"no stack?";
                break;
            }
# ifndef OPENSSL_NO_MULTIBYTE
            if (!MultiByteToWideChar(CP_ACP, 0, fmta, len_0, fmtw, len_0))
# endif
                for (i = 0; i < len_0; i++)
                    fmtw[i] = (WCHAR)fmta[i];

            for (i = 0; i < len_0; i++) {
                if (fmtw[i] == L'%')
                    do {
                        keepgoing = 0;
                        switch (fmtw[i + 1]) {
                        case L'0':
                        case L'1':
                        case L'2':
                        case L'3':
                        case L'4':
                        case L'5':
                        case L'6':
                        case L'7':
                        case L'8':
                        case L'9':
                        case L'.':
                        case L'*':
                        case L'-':
                            i++;
                            keepgoing = 1;
                            break;
                        case L's':
                            fmtw[i + 1] = L'S';
                            break;
                        case L'S':
                            fmtw[i + 1] = L's';
                            break;
                        case L'c':
                            fmtw[i + 1] = L'C';
                            break;
                        case L'C':
                            fmtw[i + 1] = L'c';
                            break;
                        }
                    } while (keepgoing);
            }
            fmt = (const TCHAR *)fmtw;
        } while (0);

    va_start(ap, fmta);
    _vsntprintf(buf, sizeof(buf) / sizeof(TCHAR) - 1, fmt, ap);
    buf[sizeof(buf) / sizeof(TCHAR) - 1] = _T('\0');
    va_end(ap);

# if defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0333
    /* this -------------v--- guards NT-specific calls */
    if (check_winnt() && OPENSSL_isservice() > 0) {
        HANDLE h = RegisterEventSource(0, _T("OPENSSL"));
        const TCHAR *pmsg = buf;
        ReportEvent(h, EVENTLOG_ERROR_TYPE, 0, 0, 0, 1, 0, &pmsg, 0);
        DeregisterEventSource(h);
    } else
# endif
        MessageBox(NULL, buf, _T("OpenSSL: FATAL"), MB_OK | MB_ICONSTOP);
}
#else
void OPENSSL_showfatal(const char *fmta, ...)
{
    va_list ap;

    va_start(ap, fmta);
    vfprintf(stderr, fmta, ap);
    va_end(ap);
}

int OPENSSL_isservice(void)
{
    return 0;
}
#endif

void OpenSSLDie(const char *file, int line, const char *assertion)
{
    OPENSSL_showfatal
        ("%s(%d): OpenSSL internal error, assertion failed: %s\n", file, line,
         assertion);
#if !defined(_WIN32) || defined(__CYGWIN__)
    abort();
#else
    /*
     * Win32 abort() customarily shows a dialog, but we just did that...
     */
# if !defined(_WIN32_WCE)
    raise(SIGABRT);
# endif
    _exit(3);
#endif
}

void *OPENSSL_stderr(void)
{
    return stderr;
}

int CRYPTO_memcmp(const void *in_a, const void *in_b, size_t len)
{
    size_t i;
    const unsigned char *a = in_a;
    const unsigned char *b = in_b;
    unsigned char x = 0;

    for (i = 0; i < len; i++)
        x |= a[i] ^ b[i];

    return x;
}