← Back
Editing: ASN1_STRING_length.3
.\" Automatically generated by Pod::Man 4.11 (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 "ASN1_STRING_LENGTH 3" .TH ASN1_STRING_LENGTH 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" ASN1_STRING_dup, ASN1_STRING_cmp, ASN1_STRING_set, ASN1_STRING_length, ASN1_STRING_type, ASN1_STRING_get0_data, ASN1_STRING_data, ASN1_STRING_to_UTF8 \- ASN1_STRING utility functions .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/asn1.h> \& \& int ASN1_STRING_length(ASN1_STRING *x); \& const unsigned char * ASN1_STRING_get0_data(const ASN1_STRING *x); \& unsigned char * ASN1_STRING_data(ASN1_STRING *x); \& \& ASN1_STRING * ASN1_STRING_dup(ASN1_STRING *a); \& \& int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b); \& \& int ASN1_STRING_set(ASN1_STRING *str, const void *data, int len); \& \& int ASN1_STRING_type(const ASN1_STRING *x); \& \& int ASN1_STRING_to_UTF8(unsigned char **out, const ASN1_STRING *in); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" These functions allow an \fB\s-1ASN1_STRING\s0\fR structure to be manipulated. .PP \&\fBASN1_STRING_length()\fR returns the length of the content of \fBx\fR. .PP \&\fBASN1_STRING_get0_data()\fR returns an internal pointer to the data of \fBx\fR. Since this is an internal pointer it should \fBnot\fR be freed or modified in any way. .PP \&\fBASN1_STRING_data()\fR is similar to \fBASN1_STRING_get0_data()\fR except the returned value is not constant. This function is deprecated: applications should use \fBASN1_STRING_get0_data()\fR instead. .PP \&\fBASN1_STRING_dup()\fR returns a copy of the structure \fBa\fR. .PP \&\fBASN1_STRING_cmp()\fR compares \fBa\fR and \fBb\fR returning 0 if the two are identical. The string types and content are compared. .PP \&\fBASN1_STRING_set()\fR sets the data of string \fBstr\fR to the buffer \&\fBdata\fR or length \fBlen\fR. The supplied data is copied. If \fBlen\fR is \-1 then the length is determined by strlen(data). .PP \&\fBASN1_STRING_type()\fR returns the type of \fBx\fR, using standard constants such as \fBV_ASN1_OCTET_STRING\fR. .PP \&\fBASN1_STRING_to_UTF8()\fR converts the string \fBin\fR to \s-1UTF8\s0 format, the converted data is allocated in a buffer in \fB*out\fR. The length of \&\fBout\fR is returned or a negative error code. The buffer \fB*out\fR should be freed using \fBOPENSSL_free()\fR. .SH "NOTES" .IX Header "NOTES" Almost all \s-1ASN1\s0 types in OpenSSL are represented as an \fB\s-1ASN1_STRING\s0\fR structure. Other types such as \fB\s-1ASN1_OCTET_STRING\s0\fR are simply typedef'ed to \fB\s-1ASN1_STRING\s0\fR and the functions call the \fB\s-1ASN1_STRING\s0\fR equivalents. \&\fB\s-1ASN1_STRING\s0\fR is also used for some \fB\s-1CHOICE\s0\fR types which consist entirely of primitive string types such as \fBDirectoryString\fR and \&\fBTime\fR. .PP These functions should \fBnot\fR be used to examine or modify \fB\s-1ASN1_INTEGER\s0\fR or \fB\s-1ASN1_ENUMERATED\s0\fR types: the relevant \fB\s-1INTEGER\s0\fR or \fB\s-1ENUMERATED\s0\fR utility functions should be used instead. .PP In general it cannot be assumed that the data returned by \fBASN1_STRING_data()\fR is null terminated or does not contain embedded nulls. The actual format of the data will depend on the actual string type itself: for example for an IA5String the data will be \s-1ASCII,\s0 for a BMPString two bytes per character in big endian format, and for a UTF8String it will be in \s-1UTF8\s0 format. .PP Similar care should be take to ensure the data is in the correct format when calling \fBASN1_STRING_set()\fR. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBASN1_STRING_length()\fR returns the length of the content of \fBx\fR. .PP \&\fBASN1_STRING_get0_data()\fR and \fBASN1_STRING_data()\fR return an internal pointer to the data of \fBx\fR. .PP \&\fBASN1_STRING_dup()\fR returns a valid \fB\s-1ASN1_STRING\s0\fR structure or \fB\s-1NULL\s0\fR if an error occurred. .PP \&\fBASN1_STRING_cmp()\fR returns an integer greater than, equal to, or less than 0, according to whether \fBa\fR is greater than, equal to, or less than \fBb\fR. .PP \&\fBASN1_STRING_set()\fR returns 1 on success or 0 on error. .PP \&\fBASN1_STRING_type()\fR returns the type of \fBx\fR. .PP \&\fBASN1_STRING_to_UTF8()\fR returns the number of bytes in output string \fBout\fR or a negative value if an error occurred. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBERR_get_error\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2002\-2020 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>.
Save File
Cancel