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129 .\" ========================================================================
131 .IX Title "ASN1_STRING_length 3"
132 .TH ASN1_STRING_length 3 "2017-12-07" "1.0.2n" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 ASN1_STRING_dup, ASN1_STRING_cmp, ASN1_STRING_set, ASN1_STRING_length,
139 ASN1_STRING_length_set, ASN1_STRING_type, ASN1_STRING_data, ASN1_STRING_to_UTF8 \-
140 ASN1_STRING utility functions
142 .IX Header "SYNOPSIS"
144 \& #include <openssl/asn1.h>
146 \& int ASN1_STRING_length(ASN1_STRING *x);
147 \& unsigned char * ASN1_STRING_data(ASN1_STRING *x);
149 \& ASN1_STRING * ASN1_STRING_dup(ASN1_STRING *a);
151 \& int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b);
153 \& int ASN1_STRING_set(ASN1_STRING *str, const void *data, int len);
155 \& int ASN1_STRING_type(ASN1_STRING *x);
157 \& int ASN1_STRING_to_UTF8(unsigned char **out, ASN1_STRING *in);
160 .IX Header "DESCRIPTION"
161 These functions allow an \fB\s-1ASN1_STRING\s0\fR structure to be manipulated.
163 \&\fIASN1_STRING_length()\fR returns the length of the content of \fBx\fR.
165 \&\fIASN1_STRING_data()\fR returns an internal pointer to the data of \fBx\fR.
166 Since this is an internal pointer it should \fBnot\fR be freed or
169 \&\fIASN1_STRING_dup()\fR returns a copy of the structure \fBa\fR.
171 \&\fIASN1_STRING_cmp()\fR compares \fBa\fR and \fBb\fR returning 0 if the two
172 are identical. The string types and content are compared.
174 \&\fIASN1_STRING_set()\fR sets the data of string \fBstr\fR to the buffer
175 \&\fBdata\fR or length \fBlen\fR. The supplied data is copied. If \fBlen\fR
176 is \-1 then the length is determined by strlen(data).
178 \&\fIASN1_STRING_type()\fR returns the type of \fBx\fR, using standard constants
179 such as \fBV_ASN1_OCTET_STRING\fR.
181 \&\fIASN1_STRING_to_UTF8()\fR converts the string \fBin\fR to \s-1UTF8\s0 format, the
182 converted data is allocated in a buffer in \fB*out\fR. The length of
183 \&\fBout\fR is returned or a negative error code. The buffer \fB*out\fR
184 should be free using \fIOPENSSL_free()\fR.
187 Almost all \s-1ASN1\s0 types in OpenSSL are represented as an \fB\s-1ASN1_STRING\s0\fR
188 structure. Other types such as \fB\s-1ASN1_OCTET_STRING\s0\fR are simply typedefed
189 to \fB\s-1ASN1_STRING\s0\fR and the functions call the \fB\s-1ASN1_STRING\s0\fR equivalents.
190 \&\fB\s-1ASN1_STRING\s0\fR is also used for some \fB\s-1CHOICE\s0\fR types which consist
191 entirely of primitive string types such as \fBDirectoryString\fR and
194 These functions should \fBnot\fR be used to examine or modify \fB\s-1ASN1_INTEGER\s0\fR
195 or \fB\s-1ASN1_ENUMERATED\s0\fR types: the relevant \fB\s-1INTEGER\s0\fR or \fB\s-1ENUMERATED\s0\fR
196 utility functions should be used instead.
198 In general it cannot be assumed that the data returned by \fIASN1_STRING_data()\fR
199 is null terminated or does not contain embedded nulls. The actual format
200 of the data will depend on the actual string type itself: for example
201 for and IA5String the data will be \s-1ASCII,\s0 for a BMPString two bytes per
202 character in big endian format, UTF8String will be in \s-1UTF8\s0 format.
204 Similar care should be take to ensure the data is in the correct format
205 when calling \fIASN1_STRING_set()\fR.
207 .IX Header "RETURN VALUES"
209 .IX Header "SEE ALSO"
210 \&\fIERR_get_error\fR\|(3)