217 lines
6.8 KiB
Groff
217 lines
6.8 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "ASN1_STRING_length 3"
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.TH ASN1_STRING_length 3 "2006-07-29" "0.9.8b" "OpenSSL"
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.SH "NAME"
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ASN1_STRING_dup, ASN1_STRING_cmp, ASN1_STRING_set, ASN1_STRING_length,
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ASN1_STRING_length_set, ASN1_STRING_type, ASN1_STRING_data \-
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ASN1_STRING utility functions
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 2
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\& int ASN1_STRING_length(ASN1_STRING *x);
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\& unsigned char * ASN1_STRING_data(ASN1_STRING *x);
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.Ve
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.PP
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.Vb 1
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\& ASN1_STRING * ASN1_STRING_dup(ASN1_STRING *a);
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.Ve
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.PP
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.Vb 1
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\& int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b);
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.Ve
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.PP
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.Vb 1
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\& int ASN1_STRING_set(ASN1_STRING *str, const void *data, int len);
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.Ve
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.PP
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.Vb 1
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\& int ASN1_STRING_type(ASN1_STRING *x);
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.Ve
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.PP
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.Vb 1
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\& int ASN1_STRING_to_UTF8(unsigned char **out, ASN1_STRING *in);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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These functions allow an \fB\s-1ASN1_STRING\s0\fR structure to be manipulated.
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.PP
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\&\fIASN1_STRING_length()\fR returns the length of the content of \fBx\fR.
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.PP
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\&\fIASN1_STRING_data()\fR returns an internal pointer to the data of \fBx\fR.
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Since this is an internal pointer it should \fBnot\fR be freed or
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modified in any way.
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.PP
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\&\fIASN1_STRING_dup()\fR returns a copy of the structure \fBa\fR.
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.PP
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\&\fIASN1_STRING_cmp()\fR compares \fBa\fR and \fBb\fR returning 0 if the two
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are identical. The string types and content are compared.
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.PP
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\&\fIASN1_STRING_set()\fR sets the data of string \fBstr\fR to the buffer
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\&\fBdata\fR or length \fBlen\fR. The supplied data is copied. If \fBlen\fR
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is \-1 then the length is determined by strlen(data).
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.PP
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\&\fIASN1_STRING_type()\fR returns the type of \fBx\fR, using standard constants
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such as \fBV_ASN1_OCTET_STRING\fR.
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.PP
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\&\fIASN1_STRING_to_UTF8()\fR converts the string \fBin\fR to \s-1UTF8\s0 format, the
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converted data is allocated in a buffer in \fB*out\fR. The length of
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\&\fBout\fR is returned or a negative error code. The buffer \fB*out\fR
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should be free using \fIOPENSSL_free()\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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Almost all \s-1ASN1\s0 types in OpenSSL are represented as an \fB\s-1ASN1_STRING\s0\fR
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structure. Other types such as \fB\s-1ASN1_OCTET_STRING\s0\fR are simply typedefed
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to \fB\s-1ASN1_STRING\s0\fR and the functions call the \fB\s-1ASN1_STRING\s0\fR equivalents.
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\&\fB\s-1ASN1_STRING\s0\fR is also used for some \fB\s-1CHOICE\s0\fR types which consist
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entirely of primitive string types such as \fBDirectoryString\fR and
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\&\fBTime\fR.
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.PP
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These functions should \fBnot\fR be used to examine or modify \fB\s-1ASN1_INTEGER\s0\fR
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or \fB\s-1ASN1_ENUMERATED\s0\fR types: the relevant \fB\s-1INTEGER\s0\fR or \fB\s-1ENUMERATED\s0\fR
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utility functions should be used instead.
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.PP
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In general it cannot be assumed that the data returned by \fIASN1_STRING_data()\fR
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is null terminated or does not contain embedded nulls. The actual format
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of the data will depend on the actual string type itself: for example
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for and IA5String the data will be \s-1ASCII\s0, for a BMPString two bytes per
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character in big endian format, UTF8String will be in \s-1UTF8\s0 format.
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.PP
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Similar care should be take to ensure the data is in the correct format
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when calling \fIASN1_STRING_set()\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIERR_get_error\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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