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EVP_RAND-TEST-RAND(7ossl)           OpenSSL          EVP_RAND-TEST-RAND(7ossl)



NAME

       EVP_RAND-TEST-RAND - The test EVP_RAND implementation


DESCRIPTION

       Support for a test generator through the EVP_RAND API. This generator
       is for test purposes only, it does not generate random numbers.

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

   Supported parameters
       The supported parameters are:

       "state" (OSSL_RAND_PARAM_STATE) <integer>
       "fips-indicator" (OSSL_RAND_PARAM_FIPS_APPROVED_INDICATOR) <integer>
           These parameter works as described in "PARAMETERS" in EVP_RAND(3).

       "strength" (OSSL_RAND_PARAM_STRENGTH) <unsigned integer>
       "reseed_requests" (OSSL_DRBG_PARAM_RESEED_REQUESTS) <unsigned integer>
       "reseed_time_interval" (OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL) <integer>
       "max_request" (OSSL_DRBG_PARAM_RESEED_REQUESTS) <unsigned integer>
       "min_entropylen" (OSSL_DRBG_PARAM_MIN_ENTROPYLEN) <unsigned integer>
       "max_entropylen" (OSSL_DRBG_PARAM_MAX_ENTROPYLEN) <unsigned integer>
       "min_noncelen" (OSSL_DRBG_PARAM_MIN_NONCELEN) <unsigned integer>
       "max_noncelen" (OSSL_DRBG_PARAM_MAX_NONCELEN) <unsigned integer>
       "max_perslen" (OSSL_DRBG_PARAM_MAX_PERSLEN) <unsigned integer>
       "max_adinlen" (OSSL_DRBG_PARAM_MAX_ADINLEN) <unsigned integer>
       "reseed_counter" (OSSL_DRBG_PARAM_RESEED_COUNTER) <unsigned integer>
           These parameters work as described in "PARAMETERS" in EVP_RAND(3),
           except that they can all be set as well as read.

       "test_entropy" (OSSL_RAND_PARAM_TEST_ENTROPY) <octet string>
           Sets the bytes returned when the test generator is sent an entropy
           request.  The current position is remembered across generate calls.
           If there are insufficient data present to satisfy a call, an error
           is returned.

       "test_nonce" (OSSL_RAND_PARAM_TEST_NONCE) <octet string>
           Sets the bytes returned when the test generator is sent a nonce
           request.  Each nonce request will return all of the bytes.

       "generate" (OSSL_RAND_PARAM_GENERATE) <integer>
           If this parameter is zero, it will only emit the nonce and entropy
           data supplied via the aforementioned parameters.  Otherwise, low
           quality non-cryptographic pseudorandom output is produced.  This
           parameter defaults to zero.


NOTES

       A context for a test generator can be obtained by calling:

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


EXAMPLES

        EVP_RAND *rand;
        EVP_RAND_CTX *rctx;
        unsigned char bytes[100];
        OSSL_PARAM params[4], *p = params;
        unsigned char entropy[1000] = { ... };
        unsigned char nonce[20] = { ... };
        unsigned int strength = 48;

        rand = EVP_RAND_fetch(NULL, "TEST-RAND", NULL);
        rctx = EVP_RAND_CTX_new(rand, NULL);
        EVP_RAND_free(rand);

        *p++ = OSSL_PARAM_construct_uint(OSSL_RAND_PARAM_STRENGTH, &strength);
        *p++ = OSSL_PARAM_construct_octet_string(OSSL_RAND_PARAM_TEST_ENTROPY,
                                                 entropy, sizeof(entropy));
        *p++ = OSSL_PARAM_construct_octet_string(OSSL_RAND_PARAM_TEST_NONCE,
                                                 nonce, sizeof(nonce));
        *p = OSSL_PARAM_construct_end();
        EVP_RAND_instantiate(rctx, strength, 0, NULL, 0, params);

        EVP_RAND_generate(rctx, bytes, sizeof(bytes), strength, 0, NULL, 0);

        EVP_RAND_CTX_free(rctx);


SEE ALSO

       EVP_RAND(3), "PARAMETERS" in EVP_RAND(3)


HISTORY

       This functionality was added in OpenSSL 3.0.


COPYRIGHT

       Copyright 2020-2024 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>.

3.4.0                             2024-10-29         EVP_RAND-TEST-RAND(7ossl)

openssl 3.4.0 - Generated Thu Nov 21 18:15:10 CST 2024
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