.\" Automatically generated by Pod::Man 4.10 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(*W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). .\" Fear. Run. Save yourself. No user-serviceable parts. . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] \fP .\} .if t \{\ . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff .if n \{\ . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} .if t \{\ . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' .ds 8 \h'\*(#H'\(*b\h'-\*(#H' .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] .ds ae a\h'-(\w'a'u*4/10)'e .ds Ae A\h'-(\w'A'u*4/10)'E . \" corrections for vroff .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' . \" for low resolution devices (crt and lpr) .if \n(.H>23 .if \n(.V>19 \ \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} .rm #[ #] #H #V #F C .\" ======================================================================== .\" .IX Title "RAND_DRBG_NEW 3SSL" .TH RAND_DRBG_NEW 3SSL "2021-03-22" "1.1.1d" "OpenSSL" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" RAND_DRBG_new, RAND_DRBG_secure_new, RAND_DRBG_set, RAND_DRBG_set_defaults, RAND_DRBG_instantiate, RAND_DRBG_uninstantiate, RAND_DRBG_free \&\- initialize and cleanup a RAND_DRBG instance .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include \& \& \& RAND_DRBG *RAND_DRBG_new(int type, \& unsigned int flags, \& RAND_DRBG *parent); \& \& RAND_DRBG *RAND_DRBG_secure_new(int type, \& unsigned int flags, \& RAND_DRBG *parent); \& \& int RAND_DRBG_set(RAND_DRBG *drbg, \& int type, unsigned int flags); \& \& int RAND_DRBG_set_defaults(int type, unsigned int flags); \& \& int RAND_DRBG_instantiate(RAND_DRBG *drbg, \& const unsigned char *pers, size_t perslen); \& \& int RAND_DRBG_uninstantiate(RAND_DRBG *drbg); \& \& void RAND_DRBG_free(RAND_DRBG *drbg); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBRAND_DRBG_new()\fR and \fBRAND_DRBG_secure_new()\fR create a new \s-1DRBG\s0 instance of the given \fBtype\fR, allocated from the heap resp. the secure heap (using \fBOPENSSL_zalloc()\fR resp. \fBOPENSSL_secure_zalloc()\fR). .PP \&\fBRAND_DRBG_set()\fR initializes the \fBdrbg\fR with the given \fBtype\fR and \fBflags\fR. .PP \&\fBRAND_DRBG_set_defaults()\fR sets the default \fBtype\fR and \fBflags\fR for new \s-1DRBG\s0 instances. .PP Currently, all \s-1DRBG\s0 types are based on AES-CTR, so \fBtype\fR can be one of the following values: NID_aes_128_ctr, NID_aes_192_ctr, NID_aes_256_ctr. Before the \s-1DRBG\s0 can be used to generate random bits, it is necessary to set its type and to instantiate it. .PP The optional \fBflags\fR argument specifies a set of bit flags which can be joined using the | operator. Currently, the only flag is \&\s-1RAND_DRBG_FLAG_CTR_NO_DF,\s0 which disables the use of a the derivation function ctr_df. For an explanation, see [\s-1NIST SP 800\-90A\s0 Rev. 1]. .PP If a \fBparent\fR instance is specified then this will be used instead of the default entropy source for reseeding the \fBdrbg\fR. It is said that the \&\fBdrbg\fR is \fIchained\fR to its \fBparent\fR. For more information, see the \s-1NOTES\s0 section. .PP \&\fBRAND_DRBG_instantiate()\fR seeds the \fBdrbg\fR instance using random input from trusted entropy sources. Optionally, a personalization string \fBpers\fR of length \fBperslen\fR can be specified. To omit the personalization string, set \fBpers\fR=NULL and \fBperslen\fR=0; .PP \&\fBRAND_DRBG_uninstantiate()\fR clears the internal state of the \fBdrbg\fR and puts it back in the uninstantiated state. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBRAND_DRBG_new()\fR and \fBRAND_DRBG_secure_new()\fR return a pointer to a \s-1DRBG\s0 instance allocated on the heap, resp. secure heap. .PP \&\fBRAND_DRBG_set()\fR, \&\fBRAND_DRBG_instantiate()\fR, and \&\fBRAND_DRBG_uninstantiate()\fR return 1 on success, and 0 on failure. .PP \&\fBRAND_DRBG_free()\fR does not return a value. .SH "NOTES" .IX Header "NOTES" The \s-1DRBG\s0 design supports \fIchaining\fR, which means that a \s-1DRBG\s0 instance can use another \fBparent\fR \s-1DRBG\s0 instance instead of the default entropy source to obtain fresh random input for reseeding, provided that \fBparent\fR \s-1DRBG\s0 instance was properly instantiated, either from a trusted entropy source, or from yet another parent \s-1DRBG\s0 instance. For a detailed description of the reseeding process, see \s-1\fBRAND_DRBG\s0\fR\|(7). .PP The default \s-1DRBG\s0 type and flags are applied only during creation of a \s-1DRBG\s0 instance. To ensure that they are applied to the global and thread-local \s-1DRBG\s0 instances (, resp. and ), it is necessary to call \&\fBRAND_DRBG_set_defaults()\fR before creating any thread and before calling any cryptographic routines that obtain random data directly or indirectly. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBOPENSSL_zalloc\fR\|(3), \&\fBOPENSSL_secure_zalloc\fR\|(3), \&\fBRAND_DRBG_generate\fR\|(3), \&\s-1\fBRAND_DRBG\s0\fR\|(7) .SH "HISTORY" .IX Header "HISTORY" The \s-1RAND_DRBG\s0 functions were added in OpenSSL 1.1.1. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2017\-2019 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at .