✏ 编辑: ASN1_STRING_cmp.3

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.\" ========================================================================
.\"
.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
\&\fIASN1_STRING_length()\fR returns the length of the content of \fBx\fR.
.PP
\&\fIASN1_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
\&\fIASN1_STRING_data()\fR is similar to \fIASN1_STRING_get0_data()\fR except the
returned value is not constant. This function is deprecated:
applications should use \fIASN1_STRING_get0_data()\fR instead.
.PP
\&\fIASN1_STRING_dup()\fR returns a copy of the structure \fBa\fR.
.PP
\&\fIASN1_STRING_cmp()\fR compares \fBa\fR and \fBb\fR returning 0 if the two
are identical. The string types and content are compared.
.PP
\&\fIASN1_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
\&\fIASN1_STRING_type()\fR returns the type of \fBx\fR, using standard constants
such as \fBV_ASN1_OCTET_STRING\fR.
.PP
\&\fIASN1_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 \fIOPENSSL_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 \fIASN1_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 \fIASN1_STRING_set()\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIASN1_STRING_length()\fR returns the length of the content of \fBx\fR.
.PP
\&\fIASN1_STRING_get0_data()\fR and \fIASN1_STRING_data()\fR return an internal pointer to
the data of \fBx\fR.
.PP
\&\fIASN1_STRING_dup()\fR returns a valid \fB\s-1ASN1_STRING\s0\fR structure or \fB\s-1NULL\s0\fR if an
error occurred.
.PP
\&\fIASN1_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
\&\fIASN1_STRING_set()\fR returns 1 on success or 0 on error.
.PP
\&\fIASN1_STRING_type()\fR returns the type of \fBx\fR.
.PP
\&\fIASN1_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"
\&\fIERR_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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