EVP_RAND-TEST-RAND - The test EVP_RAND implementation 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: These parameter works as described in "PARAMETERS" in EVP_RAND(3). These parameters work as described in "PARAMETERS" in EVP_RAND(3), except that they can all be set as well as read. 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. Sets the bytes returned when the test generator is sent a nonce request. Each nonce request will return all of the bytes. 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. 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); 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); EVP_RAND(3), "PARAMETERS" in EVP_RAND(3) This functionality was added in OpenSSL 3.0. 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>.