NAME

       EVP_set_default_properties, EVP_default_properties_enable_fips, EVP_default_properties_is_fips_enabled,
       EVP_get1_default_properties - manage default properties for future algorithm fetches

SYNOPSIS

        #include <openssl/evp.h>

        int EVP_set_default_properties(OSSL_LIB_CTX *libctx, const char *propq);
        char *EVP_get1_default_properties(OSSL_LIB_CTX *libctx);
        int EVP_default_properties_enable_fips(OSSL_LIB_CTX *libctx, int enable);
        int EVP_default_properties_is_fips_enabled(OSSL_LIB_CTX *libctx);

DESCRIPTION

       EVP_set_default_properties() sets the default properties for all future EVP algorithm fetches, implicit
       as well as explicit. See "ALGORITHM FETCHING" in crypto(7) for information about implicit and explicit
       fetching.

       EVP_set_default_properties stores the properties given with the string propq among the EVP data that's
       been stored in the library context given with libctx (NULL signifies the default library context).

       Any previous default property for the specified library context will be dropped.

       EVP_get1_default_properties() gets the default properties set for all future EVP algorithm fetches,
       implicit as well as explicit, for the specific library context.

       EVP_default_properties_enable_fips() sets the 'fips=yes' to be a default property if enable is non zero,
       otherwise it clears 'fips' from the default property query for the given libctx. It merges the fips
       default property query with any existing query strings that have been set via
       EVP_set_default_properties().

       EVP_default_properties_is_fips_enabled() indicates if 'fips=yes' is a default property for the given
       libctx. This is the default for every libctx on systems that are operaring in FIPS-approved mode.

NOTES

       EVP_set_default_properties() and  EVP_default_properties_enable_fips() are not thread safe. They are
       intended to be called only during the initialisation phase of a libctx.

       EVP_get1_default_properties() is not thread safe. The application must ensure that the context reference
       is valid and default fetching properties are not being modified by a different thread.

RETURN VALUES

       EVP_set_default_properties() and  EVP_default_properties_enable_fips() return 1 on success, or 0 on
       failure. An error is placed on the error stack if a failure occurs.

       EVP_default_properties_is_fips_enabled() returns 1 if the 'fips=yes' default property is set for the
       given libctx, otherwise it returns 0.

       EVP_get1_default_properties() returns allocated memory that must be freed by OPENSSL_free(3) on success
       and NULL on failure.

SEE ALSO

       EVP_MD_fetch(3)

HISTORY

       The functions EVP_set_default_properties(), EVP_default_properties_enable_fips(),
       EVP_default_properties_is_fips_enabled() were added in OpenSSL 3.0.

       The function EVP_get1_default_properties() was added in OpenSSL 3.5.

COPYRIGHT

       Copyright 2019-2021 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>.

3.5.3                                              2025-09-16                   EVP_SET_DEFAULT_PROPERTIES(3SSL)