Updated: 2025/Nov/16

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EVP_RAND-CRNG-TEST(7)               OpenSSL              EVP_RAND-CRNG-TEST(7)


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>.

3.5.1                             2025-07-01             EVP_RAND-CRNG-TEST(7)