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1 .\" -*- mode: troff; coding: utf-8 -*-
58 .TH EVP_RAND 3ossl 2025-09-30 3.5.4 OpenSSL
77 EVP_RAND_STATE_ERROR \- EVP RAND routines
136 The EVP RAND routines are a high-level interface to random number generators
167 NULL is a valid parameter, for which this function is a no-op.
187 of <strength> and personalisation string \fIpstr\fR of length <pstr_len>.
189 will be sought.  This call operates as per NIST SP 800\-90A and SP 800\-90C.
191 \&\fBEVP_RAND_uninstantiate()\fR uninstantiates the RAND \fIctx\fR as per
192 NIST SP 800\-90A and SP 800\-90C.  Subsequent to this call, the RAND cannot
199 will be sought.  This call operates as per NIST SP 800\-90A and SP 800\-90C.
204 treated as additional input as per NIST SP\-800\-90Ar1, Sections 9.1 and 9.2.
207 from a live source will be sought.  This call operates as per NIST SP 800\-90A
208 and SP 800\-90C.
305 .IP """fips-indicator"" (\fBOSSL_RAND_PARAM_FIPS_APPROVED_INDICATOR\fR) <integer>" 4
306 .IX Item """fips-indicator"" (OSSL_RAND_PARAM_FIPS_APPROVED_INDICATOR) <integer>"
348 Specify the minimum and maximum number of bytes of personalisation string
353 .IP """properties"" (\fBOSSL_RAND_PARAM_PROPERTIES\fR) <UTF8 string>" 4
354 .IX Item """properties"" (OSSL_RAND_PARAM_PROPERTIES) <UTF8 string>"
356 .IP """mac"" (\fBOSSL_RAND_PARAM_MAC\fR) <UTF8 string>" 4
357 .IX Item """mac"" (OSSL_RAND_PARAM_MAC) <UTF8 string>"
358 .IP """digest"" (\fBOSSL_RAND_PARAM_DIGEST\fR) <UTF8 string>" 4
359 .IX Item """digest"" (OSSL_RAND_PARAM_DIGEST) <UTF8 string>"
360 .IP """cipher"" (\fBOSSL_RAND_PARAM_CIPHER\fR) <UTF8 string>" 4
361 .IX Item """cipher"" (OSSL_RAND_PARAM_CIPHER) <UTF8 string>"
374 private DRBGs are allocated on a per thread basis, this can result in
375 significant overhead for highly multi-threaded applications.  For normal
376 use-cases, the default "reseed_requests" and "reseed_time_interval"
379 requesting prediction resistance is intended for more special use-cases
380 like generating long-term secrets.
386 The RAND life-cycle is described in \fBlife_cycle\-rand\fR\|(7).  In the future,
431 \&\fBEVP_RAND\-CTR\-DRBG\fR\|(7),
432 \&\fBEVP_RAND\-HASH\-DRBG\fR\|(7),
433 \&\fBEVP_RAND\-HMAC\-DRBG\fR\|(7),
434 \&\fBEVP_RAND\-TEST\-RAND\fR\|(7),
435 \&\fBprovider\-rand\fR\|(7),
436 \&\fBlife_cycle\-rand\fR\|(7)
444 Copyright 2020\-2025 The OpenSSL Project Authors. All Rights Reserved.