EVP_RAND-HASH-DRBG - The HASH DRBG EVP_RAND implementation 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: These parameters work as described in "PARAMETERS" in EVP_RAND(3). These parameters work as described in "PARAMETERS" in provider-rand(7). When the FIPS provider is installed using the -no_drbg_truncated_digests option to fipsinstall, only these digests are permitted (as per FIPS 140-3 IG D.R): 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, NULL); 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); NIST SP 800-90A and SP 800-90B EVP_RAND(3), "PARAMETERS" in EVP_RAND(3), openssl-fipsinstall(1) OpenSSL 3.1.1 introduced the -no_drbg_truncated_digests option to fipsinstall which restricts the permitted digests when using the FIPS provider in a complaint manner. For details refer to FIPS 140-3 IG D.R. 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>.