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Title "EVP_RAND-CTR-DRBG 7" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
EVP_RAND-CTR-DRBG - The CTR DRBG EVP_RAND implementation Header "DESCRIPTION" Support for the counter deterministic random bit generator through the \fB\s-1EVP_RAND\s0 \s-1API.\s0 Subsection "Identity" \*(L"CTR-DRBG\*(R" is the name for this implementation; it can be used with the \fBEVP_RAND_fetch() function. Subsection "Supported parameters" The supported parameters are: Item "state (OSSL_RAND_PARAM_STATE) <integer>"

0 Item "strength (OSSL_RAND_PARAM_STRENGTH) <unsigned integer>" Item "max_request (OSSL_RAND_PARAM_MAX_REQUEST) <unsigned integer>" Item "reseed_requests (OSSL_DRBG_PARAM_RESEED_REQUESTS) <unsigned integer>" Item "reseed_time_interval (OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL) <integer>" Item "min_entropylen (OSSL_DRBG_PARAM_MIN_ENTROPYLEN) <unsigned integer>" Item "max_entropylen (OSSL_DRBG_PARAM_MAX_ENTROPYLEN) <unsigned integer>" Item "min_noncelen (OSSL_DRBG_PARAM_MIN_NONCELEN) <unsigned integer>" Item "max_noncelen (OSSL_DRBG_PARAM_MAX_NONCELEN) <unsigned integer>" Item "max_perslen (OSSL_DRBG_PARAM_MAX_PERSLEN) <unsigned integer>" Item "max_adinlen (OSSL_DRBG_PARAM_MAX_ADINLEN) <unsigned integer>" Item "reseed_counter (OSSL_DRBG_PARAM_RESEED_COUNTER) <unsigned integer>" Item "properties (OSSL_DRBG_PARAM_PROPERTIES) <UTF8 string>" Item "cipher (OSSL_DRBG_PARAM_CIPHER) <UTF8 string>"

These parameters work as described in \*(L"\s-1PARAMETERS\*(R"\s0 in \s-1EVP_RAND\s0\|(3). Item "use_derivation_function (OSSL_DRBG_PARAM_USE_DF) <integer>" This Boolean indicates if a derivation function should be used or not. A nonzero value (the default) uses the derivation function. A zero value does not.

Header "NOTES" A context for \s-1CTR DRBG\s0 can be obtained by calling:

.Vb 2 EVP_RAND *rand = EVP_RAND_fetch(NULL, "CTR-DRBG", NULL); EVP_RAND_CTX *rctx = EVP_RAND_CTX_new(rand); .Ve

Header "EXAMPLES" .Vb 5 EVP_RAND *rand; EVP_RAND_CTX *rctx; unsigned char bytes[100]; OSSL_PARAM params[2], *p = params; unsigned int strength = 128; \& rand = EVP_RAND_fetch(NULL, "CTR-DRBG", NULL); rctx = EVP_RAND_CTX_new(rand, NULL); EVP_RAND_free(rand); \& *p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_CIPHER, SN_aes_256_ctr, 0); *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); .Ve Header "CONFORMING TO" \s-1NIST SP 800-90A\s0 and \s-1SP 800-90B\s0 Header "SEE ALSO" \s-1EVP_RAND\s0\|(3), \*(L"\s-1PARAMETERS\*(R"\s0 in \s-1EVP_RAND\s0\|(3) Header "COPYRIGHT" Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.