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132 .\" ========================================================================
134 .IX Title "ASN1_STRING_length 3"
135 .TH ASN1_STRING_length 3 "2009-04-11" "0.9.8k" "OpenSSL"
136 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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141 ASN1_STRING_dup, ASN1_STRING_cmp, ASN1_STRING_set, ASN1_STRING_length,
142 ASN1_STRING_length_set, ASN1_STRING_type, ASN1_STRING_data \-
143 ASN1_STRING utility functions
145 .IX Header "SYNOPSIS"
147 \& int ASN1_STRING_length(ASN1_STRING *x);
148 \& unsigned char * ASN1_STRING_data(ASN1_STRING *x);
150 \& ASN1_STRING * ASN1_STRING_dup(ASN1_STRING *a);
152 \& int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b);
154 \& int ASN1_STRING_set(ASN1_STRING *str, const void *data, int len);
156 \& int ASN1_STRING_type(ASN1_STRING *x);
158 \& int ASN1_STRING_to_UTF8(unsigned char **out, ASN1_STRING *in);
161 .IX Header "DESCRIPTION"
162 These functions allow an \fB\s-1ASN1_STRING\s0\fR structure to be manipulated.
164 \&\fIASN1_STRING_length()\fR returns the length of the content of \fBx\fR.
166 \&\fIASN1_STRING_data()\fR returns an internal pointer to the data of \fBx\fR.
167 Since this is an internal pointer it should \fBnot\fR be freed or
170 \&\fIASN1_STRING_dup()\fR returns a copy of the structure \fBa\fR.
172 \&\fIASN1_STRING_cmp()\fR compares \fBa\fR and \fBb\fR returning 0 if the two
173 are identical. The string types and content are compared.
175 \&\fIASN1_STRING_set()\fR sets the data of string \fBstr\fR to the buffer
176 \&\fBdata\fR or length \fBlen\fR. The supplied data is copied. If \fBlen\fR
177 is \-1 then the length is determined by strlen(data).
179 \&\fIASN1_STRING_type()\fR returns the type of \fBx\fR, using standard constants
180 such as \fBV_ASN1_OCTET_STRING\fR.
182 \&\fIASN1_STRING_to_UTF8()\fR converts the string \fBin\fR to \s-1UTF8\s0 format, the
183 converted data is allocated in a buffer in \fB*out\fR. The length of
184 \&\fBout\fR is returned or a negative error code. The buffer \fB*out\fR
185 should be free using \fIOPENSSL_free()\fR.
188 Almost all \s-1ASN1\s0 types in OpenSSL are represented as an \fB\s-1ASN1_STRING\s0\fR
189 structure. Other types such as \fB\s-1ASN1_OCTET_STRING\s0\fR are simply typedefed
190 to \fB\s-1ASN1_STRING\s0\fR and the functions call the \fB\s-1ASN1_STRING\s0\fR equivalents.
191 \&\fB\s-1ASN1_STRING\s0\fR is also used for some \fB\s-1CHOICE\s0\fR types which consist
192 entirely of primitive string types such as \fBDirectoryString\fR and
195 These functions should \fBnot\fR be used to examine or modify \fB\s-1ASN1_INTEGER\s0\fR
196 or \fB\s-1ASN1_ENUMERATED\s0\fR types: the relevant \fB\s-1INTEGER\s0\fR or \fB\s-1ENUMERATED\s0\fR
197 utility functions should be used instead.
199 In general it cannot be assumed that the data returned by \fIASN1_STRING_data()\fR
200 is null terminated or does not contain embedded nulls. The actual format
201 of the data will depend on the actual string type itself: for example
202 for and IA5String the data will be \s-1ASCII\s0, for a BMPString two bytes per
203 character in big endian format, UTF8String will be in \s-1UTF8\s0 format.
205 Similar care should be take to ensure the data is in the correct format
206 when calling \fIASN1_STRING_set()\fR.
208 .IX Header "RETURN VALUES"
210 .IX Header "SEE ALSO"
211 \&\fIERR_get_error\fR\|(3)