Current Path :
/
opt
/
cpanel
/
ea-openssl11
/
share
/
man
/
man3
/
Or
Select Your Path :
Upload File :
New :
File
Dir
//opt/cpanel/ea-openssl11/share/man/man3/PKCS5_PBKDF2_HMAC_SHA1.3
.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28) .\" .\" 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 turned on, 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 "PKCS5_PBKDF2_HMAC 3" .TH PKCS5_PBKDF2_HMAC 3 "2023-09-11" "1.1.1w" "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" PKCS5_PBKDF2_HMAC, PKCS5_PBKDF2_HMAC_SHA1 \- password based derivation routines with salt and iteration count .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/evp.h> \& \& int PKCS5_PBKDF2_HMAC(const char *pass, int passlen, \& const unsigned char *salt, int saltlen, int iter, \& const EVP_MD *digest, \& int keylen, unsigned char *out); \& \& int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen, \& const unsigned char *salt, int saltlen, int iter, \& int keylen, unsigned char *out); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\s-1\fIPKCS5_PBKDF2_HMAC\s0()\fR derives a key from a password using a salt and iteration count as specified in \s-1RFC 2898.\s0 .PP \&\fBpass\fR is the password used in the derivation of length \fBpasslen\fR. \fBpass\fR is an optional parameter and can be \s-1NULL.\s0 If \fBpasslen\fR is \-1, then the function will calculate the length of \fBpass\fR using \fIstrlen()\fR. .PP \&\fBsalt\fR is the salt used in the derivation of length \fBsaltlen\fR. If the \&\fBsalt\fR is \s-1NULL,\s0 then \fBsaltlen\fR must be 0. The function will not attempt to calculate the length of the \fBsalt\fR because it is not assumed to be \s-1NULL\s0 terminated. .PP \&\fBiter\fR is the iteration count and its value should be greater than or equal to 1. \s-1RFC 2898\s0 suggests an iteration count of at least 1000. Any \&\fBiter\fR less than 1 is treated as a single iteration. .PP \&\fBdigest\fR is the message digest function used in the derivation. Values include any of the EVP_* message digests. \s-1\fIPKCS5_PBKDF2_HMAC_SHA1\s0()\fR calls \&\s-1\fIPKCS5_PBKDF2_HMAC\s0()\fR with \fIEVP_sha1()\fR. .PP The derived key will be written to \fBout\fR. The size of the \fBout\fR buffer is specified via \fBkeylen\fR. .SH "NOTES" .IX Header "NOTES" A typical application of this function is to derive keying material for an encryption algorithm from a password in the \fBpass\fR, a salt in \fBsalt\fR, and an iteration count. .PP Increasing the \fBiter\fR parameter slows down the algorithm which makes it harder for an attacker to perform a brute force attack using a large number of candidate passwords. .PP These functions make no assumption regarding the given password. It will simply be treated as a byte sequence. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\s-1\fIPKCS5_PBKDF2_HMAC\s0()\fR and \s-1\fIPBKCS5_PBKDF2_HMAC_SHA1\s0()\fR return 1 on success or 0 on error. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIevp\fR\|(7), \fIRAND_bytes\fR\|(3), \&\fIEVP_BytesToKey\fR\|(3), \&\fIpassphrase\-encoding\fR\|(7) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2014\-2018 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 <https://www.openssl.org/source/license.html>.
