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1 .\" -*- mode: troff; coding: utf-8 -*-
57 .IX Title "EVP_RAND-HMAC-DRBG 7ossl"
58 .TH EVP_RAND-HMAC-DRBG 7ossl 2025-09-30 3.5.4 OpenSSL
64 EVP_RAND\-HMAC\-DRBG \- The HMAC DRBG EVP_RAND implementation
71 "HMAC-DRBG" is the name for this implementation; it can be used with the
109 .IP """fips-indicator"" (\fBOSSL_DRBG_PARAM_FIPS_APPROVED_INDICATOR\fR) <integer>" 4
110 .IX Item """fips-indicator"" (OSSL_DRBG_PARAM_FIPS_APPROVED_INDICATOR) <integer>"
112 .IP """digest-check"" (\fBOSSL_DRBG_PARAM_FIPS_DIGEST_CHECK\fR) <integer>" 4
113 .IX Item """digest-check"" (OSSL_DRBG_PARAM_FIPS_DIGEST_CHECK) <integer>"
115 These parameters work as described in "PARAMETERS" in \fBprovider\-rand\fR\|(7).
119 FIPS 140\-3 IG D.R <https://csrc.nist.gov/CSRC/media/Projects/cryptographic-module-validation-progr…
121 The default HMAC-DRBG implementation attempts to fetch the required internal
126 .IP SHA\-1 4
127 .IX Item "SHA-1"
129 .IP SHA2\-256 4
130 .IX Item "SHA2-256"
131 .IP SHA2\-512 4
132 .IX Item "SHA2-512"
133 .IP SHA3\-256 4
134 .IX Item "SHA3-256"
135 .IP SHA3\-512 4
136 .IX Item "SHA3-512"
142 \& EVP_RAND *rand = EVP_RAND_fetch(NULL, "HMAC\-DRBG", NULL);
154 \& rand = EVP_RAND_fetch(NULL, "HMAC\-DRBG", NULL);
169 NIST SP 800\-90A and SP 800\-90B
174 \&\fBopenssl\-fipsinstall\fR\|(1)
177 OpenSSL 3.1.1 introduced the \fB\-no_drbg_truncated_digests\fR option to
180 FIPS 140\-3 IG D.R <https://csrc.nist.gov/CSRC/media/Projects/cryptographic-module-validation-progr…
183 Copyright 2020\-2025 The OpenSSL Project Authors. All Rights Reserved.