Merge from vendor branch OPENSSL:
[dragonfly.git] / secure / lib / libcrypto / man / ASN1_STRING_length.3
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124.\" ========================================================================
125.\"
126.IX Title "ASN1_STRING_length 3"
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127.TH ASN1_STRING_length 3 "2007-10-24" "0.9.8g" "OpenSSL"
128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
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132.SH "NAME"
133ASN1_STRING_dup, ASN1_STRING_cmp, ASN1_STRING_set, ASN1_STRING_length,
134ASN1_STRING_length_set, ASN1_STRING_type, ASN1_STRING_data \-
74dab6c2 135ASN1_STRING utility functions
984263bc 136.SH "SYNOPSIS"
8b0cefbb 137.IX Header "SYNOPSIS"
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138.Vb 2
139\& int ASN1_STRING_length(ASN1_STRING *x);
140\& unsigned char * ASN1_STRING_data(ASN1_STRING *x);
2eaa1526 141\&
984263bc 142\& ASN1_STRING * ASN1_STRING_dup(ASN1_STRING *a);
2eaa1526 143\&
984263bc 144\& int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b);
2eaa1526 145\&
984263bc 146\& int ASN1_STRING_set(ASN1_STRING *str, const void *data, int len);
2eaa1526 147\&
984263bc 148\& int ASN1_STRING_type(ASN1_STRING *x);
2eaa1526 149\&
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150\& int ASN1_STRING_to_UTF8(unsigned char **out, ASN1_STRING *in);
151.Ve
152.SH "DESCRIPTION"
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153.IX Header "DESCRIPTION"
154These functions allow an \fB\s-1ASN1_STRING\s0\fR structure to be manipulated.
984263bc 155.PP
8b0cefbb 156\&\fIASN1_STRING_length()\fR returns the length of the content of \fBx\fR.
984263bc 157.PP
8b0cefbb 158\&\fIASN1_STRING_data()\fR returns an internal pointer to the data of \fBx\fR.
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159Since this is an internal pointer it should \fBnot\fR be freed or
160modified in any way.
161.PP
8b0cefbb 162\&\fIASN1_STRING_dup()\fR returns a copy of the structure \fBa\fR.
984263bc 163.PP
8b0cefbb 164\&\fIASN1_STRING_cmp()\fR compares \fBa\fR and \fBb\fR returning 0 if the two
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165are identical. The string types and content are compared.
166.PP
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167\&\fIASN1_STRING_set()\fR sets the data of string \fBstr\fR to the buffer
168\&\fBdata\fR or length \fBlen\fR. The supplied data is copied. If \fBlen\fR
169is \-1 then the length is determined by strlen(data).
984263bc 170.PP
8b0cefbb 171\&\fIASN1_STRING_type()\fR returns the type of \fBx\fR, using standard constants
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172such as \fBV_ASN1_OCTET_STRING\fR.
173.PP
8b0cefbb 174\&\fIASN1_STRING_to_UTF8()\fR converts the string \fBin\fR to \s-1UTF8\s0 format, the
984263bc 175converted data is allocated in a buffer in \fB*out\fR. The length of
8b0cefbb 176\&\fBout\fR is returned or a negative error code. The buffer \fB*out\fR
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177should be free using \fIOPENSSL_free()\fR.
178.SH "NOTES"
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179.IX Header "NOTES"
180Almost all \s-1ASN1\s0 types in OpenSSL are represented as an \fB\s-1ASN1_STRING\s0\fR
181structure. Other types such as \fB\s-1ASN1_OCTET_STRING\s0\fR are simply typedefed
182to \fB\s-1ASN1_STRING\s0\fR and the functions call the \fB\s-1ASN1_STRING\s0\fR equivalents.
183\&\fB\s-1ASN1_STRING\s0\fR is also used for some \fB\s-1CHOICE\s0\fR types which consist
984263bc 184entirely of primitive string types such as \fBDirectoryString\fR and
8b0cefbb 185\&\fBTime\fR.
984263bc 186.PP
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187These functions should \fBnot\fR be used to examine or modify \fB\s-1ASN1_INTEGER\s0\fR
188or \fB\s-1ASN1_ENUMERATED\s0\fR types: the relevant \fB\s-1INTEGER\s0\fR or \fB\s-1ENUMERATED\s0\fR
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189utility functions should be used instead.
190.PP
191In general it cannot be assumed that the data returned by \fIASN1_STRING_data()\fR
192is null terminated or does not contain embedded nulls. The actual format
193of the data will depend on the actual string type itself: for example
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194for and IA5String the data will be \s-1ASCII\s0, for a BMPString two bytes per
195character in big endian format, UTF8String will be in \s-1UTF8\s0 format.
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196.PP
197Similar care should be take to ensure the data is in the correct format
198when calling \fIASN1_STRING_set()\fR.
199.SH "RETURN VALUES"
74dab6c2 200.IX Header "RETURN VALUES"
8b0cefbb 201.SH "SEE ALSO"
74dab6c2 202.IX Header "SEE ALSO"
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203\&\fIERR_get_error\fR\|(3)
204.SH "HISTORY"
984263bc 205.IX Header "HISTORY"