path: root/crypto/params.c

/*
 * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
 * Copyright (c) 2019, Oracle and/or its affiliates.  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 <string.h>
#include <openssl/params.h>
#include "internal/thread_once.h"
#include "internal/numbers.h"
#include "internal/endian.h"

/*
 * Return the number of bits in the mantissa of a double.  This is used to
 * shift a larger integral value to determine if it will exactly fit into a
 * double.
 */
static unsigned int real_shift(void)
{
    return sizeof(double) == 4 ? 24 : 53;
}

OSSL_PARAM *OSSL_PARAM_locate(OSSL_PARAM *p, const char *key)
{
    if (p != NULL && key != NULL)
        for (; p->key != NULL; p++)
            if (strcmp(key, p->key) == 0)
                return p;
    return NULL;
}

const OSSL_PARAM *OSSL_PARAM_locate_const(const OSSL_PARAM *p, const char *key)
{
    return OSSL_PARAM_locate((OSSL_PARAM *)p, key);
}

static OSSL_PARAM ossl_param_construct(const char *key, unsigned int data_type,
                                       void *data, size_t data_size)
{
    OSSL_PARAM res;

    res.key = key;
    res.data_type = data_type;
    res.data = data;
    res.data_size = data_size;
    res.return_size = OSSL_PARAM_UNMODIFIED;
    return res;
}

int OSSL_PARAM_modified(const OSSL_PARAM *p)
{
    return p != NULL && p->return_size != OSSL_PARAM_UNMODIFIED;
}

void OSSL_PARAM_set_all_unmodified(OSSL_PARAM *p)
{
    if (p != NULL)
        while (p->key != NULL)
            p++->return_size = OSSL_PARAM_UNMODIFIED;
}

/* Return non-zero if the signed number is negative */
static int is_negative(const