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x SuSE Linux 13.1-RELEASEx
EVP_RAND-HASH-DRBG(7ossl) OpenSSL EVP_RAND-HASH-DRBG(7ossl)
NAME
EVP_RAND-HASH-DRBG - The HASH DRBG EVP_RAND implementation
DESCRIPTION
Support for the hash deterministic random bit generator through the
EVP_RAND API.
Identity
"HASH-DRBG" 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>
"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>
"digest" (OSSL_DRBG_PARAM_DIGEST) <UTF8 string>
These parameters work as described in "PARAMETERS" in EVP_RAND(3).
NOTES
A context for HASH DRBG can be obtained by calling:
EVP_RAND *rand = EVP_RAND_fetch(NULL, "HASH-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, "HASH-DRBG", NULL);
rctx = EVP_RAND_CTX_new(rand, NULL);
EVP_RAND_free(rand);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_DIGEST, SN_sha512, 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)
COPYRIGHT
Copyright 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>.
3.0.15 2024-09-03 EVP_RAND-HASH-DRBG(7ossl)
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