NAME

       EVP_RAND-CRNG-TEST - The FIPS health testing EVP_RAND filter

DESCRIPTION

       This EVP_RAND object acts as a filter between the entropy source and its users.  It performs CRNG health
       tests as defined in SP 800-90B <https://csrc.nist.gov/pubs/sp/800/90/b/final> Section 4 "Health Tests".
       Most requests are forwarded to the entropy source, either via its parent reference or via the provider
       entropy upcalls.

   Identity
       "CRNG-TEST" is the name for this implementation; it can be used with the EVP_RAND_fetch() function.

   Supported parameters
       If a parent EVP_RAND is specified on context creation, the parent's parameters are supported because the
       request is forwarded to the parent seed source for processing.

       If no parent EVP_RAND is specified on context creation, the following parameters are supported:

       "state" (OSSL_RAND_PARAM_STATE) <integer>
       "strength" (OSSL_RAND_PARAM_STRENGTH) <unsigned integer>
       "max_request" (OSSL_RAND_PARAM_MAX_REQUEST) <unsigned integer>
           These parameters work as described in "PARAMETERS" in EVP_RAND(3).

       "fips-indicator" (OSSL_DRBG_PARAM_FIPS_APPROVED_INDICATOR) <integer>
           This parameter works as described in "PARAMETERS" in provider-rand(7).

NOTES

       This EVP_RAND is only implemented by the OpenSSL FIPS provider.

       A context for a health test filter can be obtained by calling:

        EVP_RAND *parent = ...;
        EVP_RAND *rand = EVP_RAND_fetch(NULL, "CRNG-TEST", NULL);
        EVP_RAND_CTX *rctx = EVP_RAND_CTX_new(rand, parent);

SEE ALSO

       EVP_RAND(3), OSSL_PROVIDER-FIPS(7)

HISTORY

       This functionality was added in OpenSSL 3.4.

COPYRIGHT

       Copyright 2024 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>.

3.5.0                                              2025-06-04                           EVP_RAND-CRNG-TEST(7SSL)