EVP_RAND-CTR-DRBG - Online Linux Manual PageSection : 7SSL
Updated : 2022-08-14
Source : 3.0.5
Note : OpenSSL
NAMEEVP_RAND−CTR−DRBG − The CTR DRBG EVP_RAND implementation
DESCRIPTIONSupport for the counter deterministic random bit generator through the ​EVP_RAND API.
Identity​‟CTR-DRBG” is the name for this implementation; it can be used with the ​EVP_RAND_fetch() function.
Supported parametersThe supported parameters are: ``state'' (OSSL_RAND_PARAM_STATE) <integer> ``strength'' (OSSL_RAND_PARAM_STRENGTH) <unsigned integer> ``max_request'' (OSSL_RAND_PARAM_MAX_REQUEST) <unsigned integer> ``reseed_requests'' (OSSL_DRBG_PARAM_RESEED_REQUESTS) <unsigned integer> ``reseed_time_interval'' (OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL) <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> ``properties'' (OSSL_DRBG_PARAM_PROPERTIES) <UTF8 string> ``cipher'' (OSSL_DRBG_PARAM_CIPHER) <UTF8 string> These parameters work as described in ‟PARAMETERS” in EVP_RAND (3). ``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.
NOTESA context for CTR DRBG can be obtained by calling: ​ EVP_RAND *rand = EVP_RAND_fetch(NULL, "CTR−DRBG", NULL); ​ EVP_RAND_CTX *rctx = EVP_RAND_CTX_new(rand);
EXAMPLES​ 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);
CONFORMING TO​NIST SP 800−90A and SP 800−90B
SEE ALSO​EVP_RAND (3), ​‟PARAMETERS” in EVP_RAND (3)
COPYRIGHTCopyright 2020−2021 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>. 0
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