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ASN1_STRING_dup.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++. 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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>.
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