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129.\" ========================================================================
130.\"
131.IX Title "ASN1_STRING_length 3"
aac4ff6f 132.TH ASN1_STRING_length 3 "2008-09-06" "0.9.8h" "OpenSSL"
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133.SH "NAME"
134ASN1_STRING_dup, ASN1_STRING_cmp, ASN1_STRING_set, ASN1_STRING_length,
135ASN1_STRING_length_set, ASN1_STRING_type, ASN1_STRING_data \-
74dab6c2 136ASN1_STRING utility functions
984263bc 137.SH "SYNOPSIS"
8b0cefbb 138.IX Header "SYNOPSIS"
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139.Vb 2
140\& int ASN1_STRING_length(ASN1_STRING *x);
141\& unsigned char * ASN1_STRING_data(ASN1_STRING *x);
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142.Ve
143.PP
144.Vb 1
984263bc 145\& ASN1_STRING * ASN1_STRING_dup(ASN1_STRING *a);
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146.Ve
147.PP
148.Vb 1
984263bc 149\& int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b);
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150.Ve
151.PP
152.Vb 1
984263bc 153\& int ASN1_STRING_set(ASN1_STRING *str, const void *data, int len);
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154.Ve
155.PP
156.Vb 1
984263bc 157\& int ASN1_STRING_type(ASN1_STRING *x);
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158.Ve
159.PP
160.Vb 1
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161\& int ASN1_STRING_to_UTF8(unsigned char **out, ASN1_STRING *in);
162.Ve
163.SH "DESCRIPTION"
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164.IX Header "DESCRIPTION"
165These functions allow an \fB\s-1ASN1_STRING\s0\fR structure to be manipulated.
984263bc 166.PP
8b0cefbb 167\&\fIASN1_STRING_length()\fR returns the length of the content of \fBx\fR.
984263bc 168.PP
8b0cefbb 169\&\fIASN1_STRING_data()\fR returns an internal pointer to the data of \fBx\fR.
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170Since this is an internal pointer it should \fBnot\fR be freed or
171modified in any way.
172.PP
8b0cefbb 173\&\fIASN1_STRING_dup()\fR returns a copy of the structure \fBa\fR.
984263bc 174.PP
8b0cefbb 175\&\fIASN1_STRING_cmp()\fR compares \fBa\fR and \fBb\fR returning 0 if the two
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176are identical. The string types and content are compared.
177.PP
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178\&\fIASN1_STRING_set()\fR sets the data of string \fBstr\fR to the buffer
179\&\fBdata\fR or length \fBlen\fR. The supplied data is copied. If \fBlen\fR
180is \-1 then the length is determined by strlen(data).
984263bc 181.PP
8b0cefbb 182\&\fIASN1_STRING_type()\fR returns the type of \fBx\fR, using standard constants
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183such as \fBV_ASN1_OCTET_STRING\fR.
184.PP
8b0cefbb 185\&\fIASN1_STRING_to_UTF8()\fR converts the string \fBin\fR to \s-1UTF8\s0 format, the
984263bc 186converted data is allocated in a buffer in \fB*out\fR. The length of
8b0cefbb 187\&\fBout\fR is returned or a negative error code. The buffer \fB*out\fR
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188should be free using \fIOPENSSL_free()\fR.
189.SH "NOTES"
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190.IX Header "NOTES"
191Almost all \s-1ASN1\s0 types in OpenSSL are represented as an \fB\s-1ASN1_STRING\s0\fR
192structure. Other types such as \fB\s-1ASN1_OCTET_STRING\s0\fR are simply typedefed
193to \fB\s-1ASN1_STRING\s0\fR and the functions call the \fB\s-1ASN1_STRING\s0\fR equivalents.
194\&\fB\s-1ASN1_STRING\s0\fR is also used for some \fB\s-1CHOICE\s0\fR types which consist
984263bc 195entirely of primitive string types such as \fBDirectoryString\fR and
8b0cefbb 196\&\fBTime\fR.
984263bc 197.PP
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198These functions should \fBnot\fR be used to examine or modify \fB\s-1ASN1_INTEGER\s0\fR
199or \fB\s-1ASN1_ENUMERATED\s0\fR types: the relevant \fB\s-1INTEGER\s0\fR or \fB\s-1ENUMERATED\s0\fR
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200utility functions should be used instead.
201.PP
202In general it cannot be assumed that the data returned by \fIASN1_STRING_data()\fR
203is null terminated or does not contain embedded nulls. The actual format
204of the data will depend on the actual string type itself: for example
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205for and IA5String the data will be \s-1ASCII\s0, for a BMPString two bytes per
206character in big endian format, UTF8String will be in \s-1UTF8\s0 format.
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207.PP
208Similar care should be take to ensure the data is in the correct format
209when calling \fIASN1_STRING_set()\fR.
210.SH "RETURN VALUES"
74dab6c2 211.IX Header "RETURN VALUES"
8b0cefbb 212.SH "SEE ALSO"
74dab6c2 213.IX Header "SEE ALSO"
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214\&\fIERR_get_error\fR\|(3)
215.SH "HISTORY"
984263bc 216.IX Header "HISTORY"