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+.\" ========================================================================
+.\"
+.IX Title "ASN1_STRING_length 3"
+.TH ASN1_STRING_length 3 "2016-01-28" "1.0.2f" "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_length_set, ASN1_STRING_type, 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);
+\& 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(ASN1_STRING *x);
+\&
+\& int ASN1_STRING_to_UTF8(unsigned char **out, 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_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_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 free 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 typedefed
+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 and IA5String the data will be \s-1ASCII,\s0 for a BMPString two bytes per
+character in big endian format, UTF8String 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"
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fIERR_get_error\fR\|(3)
+.SH "HISTORY"
+.IX Header "HISTORY"