/*

 * Copyright 1995-2026 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include <stdarg.h>

#include <string.h>

#include "crypto/cryptlib.h"

#include "internal/err.h"

#include "crypto/err.h"

#include <openssl/err.h>

#include <openssl/crypto.h>

#include <openssl/buffer.h>

#include <openssl/bio.h>

#include <openssl/opensslconf.h>

#include "internal/thread_once.h"

#include "internal/threads_common.h"

#include "crypto/ctype.h"

#include "internal/constant_time.h"

#include "internal/e_os.h"

#include "err_local.h"

#ifndef OPENSSL_NO_ERR

static int err_load_strings(const ERR_STRING_DATA *str);

#endif

#ifndef OPENSSL_NO_ERR

static const ERR_STRING_DATA ERR_str_libraries[] = {

    { ERR_PACK(ERR_LIB_NONE, 0, 0), "unknown library" },

    { ERR_PACK(ERR_LIB_SYS, 0, 0), "system library" },

    { ERR_PACK(ERR_LIB_BN, 0, 0), "bignum routines" },

    { ERR_PACK(ERR_LIB_RSA, 0, 0), "rsa routines" },

    { ERR_PACK(ERR_LIB_DH, 0, 0), "Diffie-Hellman routines" },

    { ERR_PACK(ERR_LIB_EVP, 0, 0), "digital envelope routines" },

    { ERR_PACK(ERR_LIB_BUF, 0, 0), "memory buffer routines" },

    { ERR_PACK(ERR_LIB_OBJ, 0, 0), "object identifier routines" },

    { ERR_PACK(ERR_LIB_PEM, 0, 0), "PEM routines" },

    { ERR_PACK(ERR_LIB_DSA, 0, 0), "dsa routines" },

    { ERR_PACK(ERR_LIB_X509, 0, 0), "x509 certificate routines" },

    { ERR_PACK(ERR_LIB_ASN1, 0, 0), "asn1 encoding routines" },

    { ERR_PACK(ERR_LIB_CONF, 0, 0), "configuration file routines" },

    { ERR_PACK(ERR_LIB_CRYPTO, 0, 0), "common libcrypto routines" },

    { ERR_PACK(ERR_LIB_EC, 0, 0), "elliptic curve routines" },

    { ERR_PACK(ERR_LIB_ECDSA, 0, 0), "ECDSA routines" },

    { ERR_PACK(ERR_LIB_ECDH, 0, 0), "ECDH routines" },

    { ERR_PACK(ERR_LIB_SSL, 0, 0), "SSL routines" },

    { ERR_PACK(ERR_LIB_BIO, 0, 0), "BIO routines" },

    { ERR_PACK(ERR_LIB_PKCS7, 0, 0), "PKCS7 routines" },

    { ERR_PACK(ERR_LIB_X509V3, 0, 0), "X509 V3 routines" },

    { ERR_PACK(ERR_LIB_PKCS12, 0, 0), "PKCS12 routines" },

    { ERR_PACK(ERR_LIB_RAND, 0, 0), "random number generator" },

    { ERR_PACK(ERR_LIB_DSO, 0, 0), "DSO support routines" },

    { ERR_PACK(ERR_LIB_TS, 0, 0), "time stamp routines" },

    { ERR_PACK(ERR_LIB_ENGINE, 0, 0), "engine routines" },

    { ERR_PACK(ERR_LIB_OCSP, 0, 0), "OCSP routines" },

    { ERR_PACK(ERR_LIB_UI, 0, 0), "UI routines" },

    { ERR_PACK(ERR_LIB_FIPS, 0, 0), "FIPS routines" },

    { ERR_PACK(ERR_LIB_CMS, 0, 0), "CMS routines" },

    { ERR_PACK(ERR_LIB_CRMF, 0, 0), "CRMF routines" },

    { ERR_PACK(ERR_LIB_CMP, 0, 0), "CMP routines" },

    { ERR_PACK(ERR_LIB_HMAC, 0, 0), "HMAC routines" },

    { ERR_PACK(ERR_LIB_CT, 0, 0), "CT routines" },

    { ERR_PACK(ERR_LIB_ASYNC, 0, 0), "ASYNC routines" },

    { ERR_PACK(ERR_LIB_KDF, 0, 0), "KDF routines" },

    { ERR_PACK(ERR_LIB_OSSL_STORE, 0, 0), "STORE routines" },

    { ERR_PACK(ERR_LIB_SM2, 0, 0), "SM2 routines" },

    { ERR_PACK(ERR_LIB_ESS, 0, 0), "ESS routines" },

    { ERR_PACK(ERR_LIB_PROV, 0, 0), "Provider routines" },

    { ERR_PACK(ERR_LIB_OSSL_ENCODER, 0, 0), "ENCODER routines" },

    { ERR_PACK(ERR_LIB_OSSL_DECODER, 0, 0), "DECODER routines" },

    { ERR_PACK(ERR_LIB_HTTP, 0, 0), "HTTP routines" },

    { 0, NULL },

};

/*

 * Should make sure that all ERR_R_ reasons defined in include/openssl/err.h.in

 * are listed.  For maintainability, please keep all reasons in the same order.

 */

static const ERR_STRING_DATA ERR_str_reasons[] = {

    { ERR_R_SYS_LIB, "system lib" },

    { ERR_R_BN_LIB, "BN lib" },

    { ERR_R_RSA_LIB, "RSA lib" },

    { ERR_R_DH_LIB, "DH lib" },

    { ERR_R_EVP_LIB, "EVP lib" },

    { ERR_R_BUF_LIB, "BUF lib" },

    { ERR_R_OBJ_LIB, "OBJ lib" },

    { ERR_R_PEM_LIB, "PEM lib" },

    { ERR_R_DSA_LIB, "DSA lib" },

    { ERR_R_X509_LIB, "X509 lib" },

    { ERR_R_ASN1_LIB, "ASN1 lib" },

    { ERR_R_CRYPTO_LIB, "CRYPTO lib" },

    { ERR_R_EC_LIB, "EC lib" },

    { ERR_R_BIO_LIB, "BIO lib" },

    { ERR_R_PKCS7_LIB, "PKCS7 lib" },

    { ERR_R_X509V3_LIB, "X509V3 lib" },

    { ERR_R_ENGINE_LIB, "ENGINE lib" },

    { ERR_R_UI_LIB, "UI lib" },

    { ERR_R_ECDSA_LIB, "ECDSA lib" },

    { ERR_R_OSSL_STORE_LIB, "OSSL_STORE lib" },

    { ERR_R_OSSL_DECODER_LIB, "OSSL_DECODER lib" },

    { ERR_R_FATAL, "fatal" },

    { ERR_R_MALLOC_FAILURE, "malloc failure" },

    { ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED,

        "called a function you should not call" },

    { ERR_R_PASSED_NULL_PARAMETER, "passed a null parameter" },

    { ERR_R_INTERNAL_ERROR, "internal error" },

    { ERR_R_DISABLED, "called a function that was disabled at compile-time" },

    { ERR_R_INIT_FAIL, "init fail" },

    { ERR_R_PASSED_INVALID_ARGUMENT, "passed invalid argument" },

    { ERR_R_OPERATION_FAIL, "operation fail" },

    { ERR_R_INVALID_PROVIDER_FUNCTIONS, "invalid provider functions" },

    { ERR_R_INTERRUPTED_OR_CANCELLED, "interrupted or cancelled" },

    { ERR_R_NESTED_ASN1_ERROR, "nested asn1 error" },

    { ERR_R_MISSING_ASN1_EOS, "missing asn1 eos" },

    /*

     * Something is unsupported, exactly what is expressed with additional data

     */

    { ERR_R_UNSUPPORTED, "unsupported" },

    /*

     * A fetch failed for other reasons than the name to be fetched being

     * unsupported.

     */

    { ERR_R_FETCH_FAILED, "fetch failed" },

    { ERR_R_INVALID_PROPERTY_DEFINITION, "invalid property definition" },

    { ERR_R_UNABLE_TO_GET_READ_LOCK, "unable to get read lock" },

    { ERR_R_UNABLE_TO_GET_WRITE_LOCK, "unable to get write lock" },

    { 0, NULL },

};

#endif

static CRYPTO_ONCE err_string_init = CRYPTO_ONCE_STATIC_INIT;

static CRYPTO_RWLOCK *err_string_lock = NULL;

#ifndef OPENSSL_NO_ERR

static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *);

#endif

/*

 * The internal state

 */

#ifndef OPENSSL_NO_ERR

static LHASH_OF(ERR_STRING_DATA) *int_error_hash = NULL;

#endif

static int int_err_library_number = ERR_LIB_USER;

typedef enum ERR_GET_ACTION_e {

    EV_POP,

    EV_PEEK,

    EV_PEEK_LAST

} ERR_GET_ACTION;

static unsigned long get_error_values(ERR_GET_ACTION g,

    const char **file, int *line,

    const char **func, const char **data,

    int *flags);

#ifndef OPENSSL_NO_ERR

static unsigned long err_string_data_hash(const ERR_STRING_DATA *a)

{

    unsigned long ret, l;

    l = a->error;

    ret = l ^ ERR_GET_LIB(l);

    return (ret ^ ret % 19 * 13);

}

static int err_string_data_cmp(const ERR_STRING_DATA *a,

    const ERR_STRING_DATA *b)

{

    if (a->error == b->error)

        return 0;

    return a->error > b->error ? 1 : -1;

}

static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *d)

{

    ERR_STRING_DATA *p = NULL;

    if (!CRYPTO_THREAD_read_lock(err_string_lock))

        return NULL;

    p = lh_ERR_STRING_DATA_retrieve(int_error_hash, d);

    CRYPTO_THREAD_unlock(err_string_lock);

    return p;

}

#endif

void OSSL_ERR_STATE_free(ERR_STATE *state)

{

    int i;

    if (state == NULL)

        return;

    for (i = 0; i < ERR_NUM_ERRORS; i++) {

        err_clear(state, i, 1);

    }

    CRYPTO_free(state, OPENSSL_FILE, OPENSSL_LINE);

}

DEFINE_RUN_ONCE_STATIC(do_err_strings_init)

{

    if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))

        return 0;

    err_string_lock = CRYPTO_THREAD_lock_new();

    if (err_string_lock == NULL)

        return 0;

#ifndef OPENSSL_NO_ERR

    int_error_hash = lh_ERR_STRING_DATA_new(err_string_data_hash,

        err_string_data_cmp);

    if (int_error_hash == NULL) {

        CRYPTO_THREAD_lock_free(err_string_lock);

        err_string_lock = NULL;

        return 0;

    }

#endif

    return 1;

}

void err_cleanup(void)

{

    CRYPTO_THREAD_lock_free(err_string_lock);

    err_string_lock = NULL;

#ifndef OPENSSL_NO_ERR

    lh_ERR_STRING_DATA_free(int_error_hash);

    int_error_hash = NULL;

#endif

}

#ifndef OPENSSL_NO_ERR

/*

 * Legacy; pack in the library.

 */

static void err_patch(int lib, ERR_STRING_DATA *str)

{

    unsigned long plib = ERR_PACK(lib, 0, 0);

    for (; str->error != 0; str++)

        str->error |= plib;

}

/*

 * Hash in |str| error strings. Assumes the RUN_ONCE was done.

 */

static int err_load_strings(const ERR_STRING_DATA *str)

{

    if (!CRYPTO_THREAD_write_lock(err_string_lock))

        return 0;

    for (; str->error; str++)

        (void)lh_ERR_STRING_DATA_insert(int_error_hash,

            (ERR_STRING_DATA *)str);

    CRYPTO_THREAD_unlock(err_string_lock);

    return 1;

}

#endif

int ossl_err_load_ERR_strings(void)

{

#ifndef OPENSSL_NO_ERR

    if (!RUN_ONCE(&err_string_init, do_err_strings_init))

        return 0;

    err_load_strings(ERR_str_libraries);

    err_load_strings(ERR_str_reasons);

#endif

    return 1;

}

int ERR_load_strings(int lib, ERR_STRING_DATA *str)

{

#ifndef OPENSSL_NO_ERR

    if (ossl_err_load_ERR_strings() == 0)

        return 0;

    err_patch(lib, str);

    err_load_strings(str);

#endif

    return 1;

}

int ERR_load_strings_const(const ERR_STRING_DATA *str)

{

#ifndef OPENSSL_NO_ERR

    if (ossl_err_load_ERR_strings() == 0)

        return 0;

    err_load_strings(str);

#endif

    return 1;

}

int ERR_unload_strings(int lib, ERR_STRING_DATA *str)

{

#ifndef OPENSSL_NO_ERR

    if (!RUN_ONCE(&err_string_init, do_err_strings_init))

        return 0;

    /* The error string table may already have been cleaned up. */

    if (err_string_lock == NULL)

        return 1;

    if (!CRYPTO_THREAD_write_lock(err_string_lock))

        return 0;

    /*

     * We don't need to ERR_PACK the lib, since that was done (to

     * the table) when it was loaded.

     */

    for (; str->error; str++)

        (void)lh_ERR_STRING_DATA_delete(int_error_hash, str);

    CRYPTO_THREAD_unlock(err_string_lock);

#endif

    return 1;

}

void err_free_strings_int(void)

{

    /* obsolete */

}

/********************************************************/

void ERR_clear_error(void)

{

    int i;

    ERR_STATE *es;

    es = ossl_err_get_state_int(0);

    if (es == NULL)

        return;

    for (i = 0; i < ERR_NUM_ERRORS; i++) {

        err_clear(es, i, 0);

    }

    es->top = es->bottom = 0;

}

unsigned long ERR_get_error(void)

{

    return get_error_values(EV_POP, NULL, NULL, NULL, NULL, NULL);

}

unsigned long ERR_get_error_all(const char **file, int *line,

    const char **func,

    const char **data, int *flags)

{

    return get_error_values(EV_POP, file, line, func, data, flags);

}

#ifndef OPENSSL_NO_DEPRECATED_3_0

unsigned long ERR_get_error_line(const char **file, int *line)

{

    return get_error_values(EV_POP, file, line, NULL, NULL, NULL);

}

unsigned long ERR_get_error_line_data(const char **file, int *line,

    const char **data, int *flags)

{

    return get_error_values(EV_POP, file, line, NULL, data, flags);

}

#endif

unsigned long ERR_peek_error(void)

{

    return get_error_values(EV_PEEK, NULL, NULL, NULL, NULL, NULL);

}

unsigned long ERR_peek_error_line(const char **file, int *line)

{

    return get_error_values(EV_PEEK, file, line, NULL, NULL, NULL);

}

unsigned long ERR_peek_error_func(const char **func)

{

    return get_error_values(EV_PEEK, NULL, NULL, func, NULL, NULL);

}

unsigned long ERR_peek_error_data(const char **data, int *flags)

{

    return get_error_values(EV_PEEK, NULL, NULL, NULL, data, flags);

}

unsigned long ERR_peek_error_all(const char **file, int *line,

    const char **func,

    const char **data, int *flags)

{

    return get_error_values(EV_PEEK, file, line, func, data, flags);

}

#ifndef OPENSSL_NO_DEPRECATED_3_0

unsigned long ERR_peek_error_line_data(const char **file, int *line,

    const char **data, int *flags)

{

    return get_error_values(EV_PEEK, file, line, NULL, data, flags);

}

#endif

unsigned long ERR_peek_last_error(void)

{

    return get_error_values(EV_PEEK_LAST, NULL, NULL, NULL, NULL, NULL);

}

unsigned long ERR_peek_last_error_line(const char **file, int *line)

{

    return get_error_values(EV_PEEK_LAST, file, line, NULL, NULL, NULL);

}

unsigned long ERR_peek_last_error_func(const char **func)

{

    return get_error_values(EV_PEEK_LAST, NULL, NULL, func, NULL, NULL);

}

unsigned long ERR_peek_last_error_data(const char **data, int *flags)

{

    return get_error_values(EV_PEEK_LAST, NULL, NULL, NULL, data, flags);

}

unsigned long ERR_peek_last_error_all(const char **file, int *line,

    const char **func,

    const char **data, int *flags)

{

    return get_error_values(EV_PEEK_LAST, file, line, func, data, flags);

}

#ifndef OPENSSL_NO_DEPRECATED_3_0

unsigned long ERR_peek_last_error_line_data(const char **file, int *line,

    const char **data, int *flags)

{

    return get_error_values(EV_PEEK_LAST, file, line, NULL, data, flags);

}

#endif

static unsigned long get_error_values(ERR_GET_ACTION g,

    const char **file, int *line,

    const char **func,

    const char **data, int *flags)

{

    int i = 0;

    ERR_STATE *es;

    unsigned long ret;

    es = ossl_err_get_state_int(1);

    if (es == NULL)

        return 0;

    /*

     * Clear anything that should have been cleared earlier. We do this

     * here because this doesn't have constant-time issues.

     */

    while (es->bottom != es->top) {

        if (es->err_flags[es->top] & ERR_FLAG_CLEAR) {

            err_clear(es, es->top, 0);

            es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;

            continue;

        }

        i = (es->bottom + 1) % ERR_NUM_ERRORS;

        if (es->err_flags[i] & ERR_FLAG_CLEAR) {

            es->bottom = i;

            err_clear(es, es->bottom, 0);

            continue;

        }

        break;

    }

    /* If everything has been cleared, the stack is empty. */

    if (es->bottom == es->top)

        return 0;

    /* Which error, the top of stack (latest one) or the first one? */

    if (g == EV_PEEK_LAST)

        i = es->top;

    else

        i = (es->bottom + 1) % ERR_NUM_ERRORS;

    ret = es->err_buffer[i];

    if (g == EV_POP) {

        es->bottom = i;

        es->err_buffer[i] = 0;

    }

    if (file != NULL) {

        *file = es->err_file[i];

        if (*file == NULL)

            *file = "";

    }

    if (line != NULL)

        *line = es->err_line[i];

    if (func != NULL) {

        *func = es->err_func[i];

        if (*func == NULL)

            *func = "";

    }

    if (flags != NULL)

        *flags = es->err_data_flags[i];

    if (data == NULL) {

        if (g == EV_POP) {

            err_clear_data(es, i, 0);

        }

    } else {

        *data = es->err_data[i];

        if (*data == NULL) {

            *data = "";

            if (flags != NULL)

                *flags = 0;

        }

    }

    return ret;

}

void ossl_err_string_int(unsigned long e, const char *func,

    char *buf, size_t len)

{

    char lsbuf[64], rsbuf[256];

    const char *ls, *rs = NULL;

    unsigned long l, r;

    int n;

    if (len == 0)

        return;

    l = ERR_GET_LIB(e);

    ls = ERR_lib_error_string(e);

    if (ls == NULL) {

        snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);

        ls = lsbuf;

    }

    /*

     * ERR_reason_error_string() can't safely return system error strings,

     * since it would call openssl_strerror_r(), which needs a buffer for

     * thread safety.  So for system errors, we call openssl_strerror_r()

     * directly instead.

     */

    r = ERR_GET_REASON(e);

#ifndef OPENSSL_NO_ERR

    if (ERR_SYSTEM_ERROR(e)) {

        if (openssl_strerror_r(r, rsbuf, sizeof(rsbuf)))

            rs = rsbuf;

    } else {

        rs = ERR_reason_error_string(e);

    }

#endif

    if (rs == NULL) {

        snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)",

            r & ~(ERR_RFLAGS_MASK << ERR_RFLAGS_OFFSET));

        rs = rsbuf;

    }

    n = snprintf(buf, len, "error:%08lX:%s:%s:%s", e, ls, func, rs);

    if (n < 0 || (size_t)n >= len)

        /* Didn't fit; use a minimal format. */

        snprintf(buf, len, "err:%lx:%lx:%lx:%lx", e, l, 0L, r);

}

void ERR_error_string_n(unsigned long e, char *buf, size_t len)

{

    ossl_err_string_int(e, "", buf, len);

}

/*

 * ERR_error_string_n should be used instead for ret != NULL as

 * ERR_error_string cannot know how large the buffer is

 */

char *ERR_error_string(unsigned long e, char *ret)

{

    static char buf[256];

    if (ret == NULL)

        ret = buf;

    ERR_error_string_n(e, ret, (int)sizeof(buf));

    return ret;

}

const char *ERR_lib_error_string(unsigned long e)

{

#ifndef OPENSSL_NO_ERR

    ERR_STRING_DATA d, *p;

    unsigned long l;

    if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {

        return NULL;

    }

    l = ERR_GET_LIB(e);

    d.error = ERR_PACK(l, 0, 0);

    p = int_err_get_item(&d);

    return ((p == NULL) ? NULL : p->string);

#else

    return NULL;

#endif

}

#ifndef OPENSSL_NO_DEPRECATED_3_0

const char *ERR_func_error_string(unsigned long e)

{

    return NULL;

}

#endif

const char *ERR_reason_error_string(unsigned long e)

{

#ifndef OPENSSL_NO_ERR

    ERR_STRING_DATA d, *p = NULL;

    unsigned long l, r;

    if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {

        return NULL;

    }

    /*

     * ERR_reason_error_string() can't safely return system error strings,

     * since openssl_strerror_r() needs a buffer for thread safety, and we

     * haven't got one that would serve any sensible purpose.

     */

    if (ERR_SYSTEM_ERROR(e))

        return NULL;

    l = ERR_GET_LIB(e);

    r = ERR_GET_REASON(e);

    d.error = ERR_PACK(l, 0, r);

    p = int_err_get_item(&d);

    if (p == NULL) {

        d.error = ERR_PACK(0, 0, r);

        p = int_err_get_item(&d);

    }

    return ((p == NULL) ? NULL : p->string);

#else

    return NULL;

#endif

}

static void err_delete_thread_state(void *unused)

{

    ERR_STATE *state = CRYPTO_THREAD_get_local_ex(CRYPTO_THREAD_LOCAL_ERR_KEY,

        CRYPTO_THREAD_NO_CONTEXT);

    if (state == NULL)

        return;

    CRYPTO_THREAD_set_local_ex(CRYPTO_THREAD_LOCAL_ERR_KEY,

        CRYPTO_THREAD_NO_CONTEXT, NULL);

    OSSL_ERR_STATE_free(state);

}

ERR_STATE *ossl_err_get_state_int(int save_sys_error)

{

    ERR_STATE *state;

    int saveerrno = 0;

    if (save_sys_error)

        saveerrno = get_last_sys_error();

    if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))

        return NULL;

    state = CRYPTO_THREAD_get_local_ex(CRYPTO_THREAD_LOCAL_ERR_KEY,

        CRYPTO_THREAD_NO_CONTEXT);

    if (state == (ERR_STATE *)-1)

        return NULL;

    if (state == NULL) {

        if (!CRYPTO_THREAD_set_local_ex(CRYPTO_THREAD_LOCAL_ERR_KEY,

                CRYPTO_THREAD_NO_CONTEXT, (ERR_STATE *)-1))

            return NULL;

        state = OSSL_ERR_STATE_new();

        if (state == NULL) {

            CRYPTO_THREAD_set_local_ex(CRYPTO_THREAD_LOCAL_ERR_KEY,

                CRYPTO_THREAD_NO_CONTEXT, NULL);

            return NULL;

        }

        if (!ossl_init_thread_start(NULL, NULL, err_delete_thread_state)

            || !CRYPTO_THREAD_set_local_ex(CRYPTO_THREAD_LOCAL_ERR_KEY,

                CRYPTO_THREAD_NO_CONTEXT, state)) {

            OSSL_ERR_STATE_free(state);

            CRYPTO_THREAD_set_local_ex(CRYPTO_THREAD_LOCAL_ERR_KEY,

                CRYPTO_THREAD_NO_CONTEXT, NULL);

            return NULL;

        }

        /* Ignore failures from these */

        OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);

    }

    if (save_sys_error)

        set_sys_error(saveerrno);

    return state;

}

/*

 * err_shelve_state returns the current thread local error state

 * and freezes the error module until err_unshelve_state is called.

 */

int err_shelve_state(void **state)

{

    int saveerrno = get_last_sys_error();

    /*

     * Note, at present our only caller is OPENSSL_init_crypto(), indirectly

     * via ossl_init_load_crypto_nodelete(), by which point the requested

     * "base" initialization has already been performed, so the below call is a

     * NOOP, that re-enters OPENSSL_init_crypto() only to quickly return.

     *

     * If are no other valid callers of this function, the call below can be

     * removed, avoiding the re-entry into OPENSSL_init_crypto().  If there are

     * potential uses that are not from inside OPENSSL_init_crypto(), then this

     * call is needed, but some care is required to make sure that the re-entry

     * remains a NOOP.

     */

    if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))

        return 0;

    *state = CRYPTO_THREAD_get_local_ex(CRYPTO_THREAD_LOCAL_ERR_KEY,

        CRYPTO_THREAD_NO_CONTEXT);

    if (!CRYPTO_THREAD_set_local_ex(CRYPTO_THREAD_LOCAL_ERR_KEY,

            CRYPTO_THREAD_NO_CONTEXT, (ERR_STATE *)-1))

        return 0;

    set_sys_error(saveerrno);

    return 1;

}

/*

 * err_unshelve_state restores the error state that was returned

 * by err_shelve_state previously.

 */

void err_unshelve_state(void *state)

{

    if (state != (void *)-1)

        CRYPTO_THREAD_set_local_ex(CRYPTO_THREAD_LOCAL_ERR_KEY,

            CRYPTO_THREAD_NO_CONTEXT, (ERR_STATE *)state);

}

int ERR_get_next_error_library(void)

{

    int ret;

    if (!RUN_ONCE(&err_string_init, do_err_strings_init))

        return 0;

    if (!CRYPTO_THREAD_write_lock(err_string_lock))

        return 0;

    ret = int_err_library_number++;

    CRYPTO_THREAD_unlock(err_string_lock);

    return ret;

}

static int err_set_error_data_int(char *data, size_t size, int flags,

    int deallocate)

{

    ERR_STATE *es;

    es = ossl_err_get_state_int(1);

    if (es == NULL)

        return 0;

    err_clear_data(es, es->top, deallocate);

    err_set_data(es, es->top, data, size, flags);

    return 1;

}

void ERR_set_error_data(char *data, int flags)

{

    /*

     * This function is void so we cannot propagate the error return. Since it

     * is also in the public API we can't change the return type.

     *

     * We estimate the size of the data.  If it's not flagged as allocated,

     * then this is safe, and if it is flagged as allocated, then our size

     * may be smaller than the actual allocation, but that doesn't matter

     * too much, the buffer will remain untouched or will eventually be

     * reallocated to a new size.

     *

     * callers should be advised that this function takes over ownership of

     * the allocated memory, i.e. they can't count on the pointer to remain

     * valid.

     */

    err_set_error_data_int(data, strlen(data) + 1, flags, 1);

}

void ERR_add_error_data(int num, ...)

{

    va_list args;

    va_start(args, num);

    ERR_add_error_vdata(num, args);

    va_end(args);

}

void ERR_add_error_vdata(int num, va_list args)

{

    int i;

    size_t len, size;

    int flags = ERR_TXT_MALLOCED | ERR_TXT_STRING;

    char *str, *arg;

    ERR_STATE *es;

    /* Get the current error data; if an allocated string get it. */

    es = ossl_err_get_state_int(1);

    if (es == NULL)

        return;

    i = es->top;

    /*

     * If err_data is allocated already, reuse the space.

     * Otherwise, allocate a small new buffer.

     */

    if ((es->err_data_flags[i] & flags) == flags

        && ossl_assert(es->err_data[i] != NULL)) {

        str = es->err_data[i];

        size = es->err_data_size[i];

        /*

         * To protect the string we just grabbed from tampering by other

         * functions we may call, or to protect them from freeing a pointer

         * that may no longer be valid at that point, we clear away the

         * data pointer and the flags.  We will set them again at the end

         * of this function.

         */

        es->err_data[i] = NULL;

        es->err_data_flags[i] = 0;

    } else if ((str = OPENSSL_malloc(size = 81)) == NULL) {

        return;

    } else {

        str[0] = '\0';

    }

    len = strlen(str);

    while (--num >= 0) {

        arg = va_arg(args, char *);

        if (arg == NULL)

            arg = "<NULL>";

        len += strlen(arg);

        if (len >= size) {

            char *p;

            size = len + 20;

            p = OPENSSL_realloc(str, size);

            if (p == NULL) {

                OPENSSL_free(str);

                return;

            }

            str = p;

        }

        OPENSSL_strlcat(str, arg, size);

    }

    if (!err_set_error_data_int(str, size, flags, 0))

        OPENSSL_free(str);

}

void err_clear_last_constant_time(int clear)

{

    ERR_STATE *es;

    int top;

    es = ossl_err_get_state_int(0);

    if (es == NULL)

        return;

    top = es->top;

    /*

     * Flag error as cleared but remove it elsewhere to avoid two errors

     * accessing the same error stack location, revealing timing information.

     */

    clear = constant_time_select_int(constant_time_eq_int(clear, 0),

        0, ERR_FLAG_CLEAR);

    es->err_flags[top] |= clear;

}