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✏️ Editing: ASN1_TYPE_get.3

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.\" ========================================================================
.\"
.IX Title "ASN1_TYPE_GET 3"
.TH ASN1_TYPE_GET 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
ASN1_TYPE_get, ASN1_TYPE_set, ASN1_TYPE_set1, ASN1_TYPE_cmp, ASN1_TYPE_unpack_sequence, ASN1_TYPE_pack_sequence \- ASN1_TYPE utility functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/asn1.h>
\&
\& int ASN1_TYPE_get(const ASN1_TYPE *a);
\& void ASN1_TYPE_set(ASN1_TYPE *a, int type, void *value);
\& int ASN1_TYPE_set1(ASN1_TYPE *a, int type, const void *value);
\& int ASN1_TYPE_cmp(const ASN1_TYPE *a, const ASN1_TYPE *b);
\&
\& void *ASN1_TYPE_unpack_sequence(const ASN1_ITEM *it, const ASN1_TYPE *t);
\& ASN1_TYPE *ASN1_TYPE_pack_sequence(const ASN1_ITEM *it, void *s,
\&                                    ASN1_TYPE **t);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
These functions allow an \s-1ASN1_TYPE\s0 structure to be manipulated. The
\&\s-1ASN1_TYPE\s0 structure can contain any \s-1ASN.1\s0 type or constructed type
such as a \s-1SEQUENCE:\s0 it is effectively equivalent to the \s-1ASN.1 ANY\s0 type.
.PP
\&\fBASN1_TYPE_get()\fR returns the type of \fBa\fR.
.PP
\&\fBASN1_TYPE_set()\fR sets the value of \fBa\fR to \fBtype\fR and \fBvalue\fR. This
function uses the pointer \fBvalue\fR internally so it must \fBnot\fR be freed
up after the call.
.PP
\&\fBASN1_TYPE_set1()\fR sets the value of \fBa\fR to \fBtype\fR a copy of \fBvalue\fR.
.PP
\&\fBASN1_TYPE_cmp()\fR compares \s-1ASN.1\s0 types \fBa\fR and \fBb\fR and returns 0 if
they are identical and nonzero otherwise.
.PP
\&\fBASN1_TYPE_unpack_sequence()\fR attempts to parse the \s-1SEQUENCE\s0 present in
\&\fBt\fR using the \s-1ASN.1\s0 structure \fBit\fR. If successful it returns a pointer
to the \s-1ASN.1\s0 structure corresponding to \fBit\fR which must be freed by the
caller. If it fails it return \s-1NULL.\s0
.PP
\&\fBASN1_TYPE_pack_sequence()\fR attempts to encode the \s-1ASN.1\s0 structure \fBs\fR
corresponding to \fBit\fR into an \s-1ASN1_TYPE.\s0 If successful the encoded
\&\s-1ASN1_TYPE\s0 is returned. If \fBt\fR and \fB*t\fR are not \s-1NULL\s0 the encoded type
is written to \fBt\fR overwriting any existing data. If \fBt\fR is not \s-1NULL\s0
but \fB*t\fR is \s-1NULL\s0 the returned \s-1ASN1_TYPE\s0 is written to \fB*t\fR.
.SH "NOTES"
.IX Header "NOTES"
The type and meaning of the \fBvalue\fR parameter for \fBASN1_TYPE_set()\fR and
\&\fBASN1_TYPE_set1()\fR is determined by the \fBtype\fR parameter.
If \fBtype\fR is V_ASN1_NULL \fBvalue\fR is ignored. If \fBtype\fR is V_ASN1_BOOLEAN
then the boolean is set to \s-1TRUE\s0 if \fBvalue\fR is not \s-1NULL.\s0 If \fBtype\fR is
V_ASN1_OBJECT then value is an \s-1ASN1_OBJECT\s0 structure. Otherwise \fBtype\fR
is and \s-1ASN1_STRING\s0 structure. If \fBtype\fR corresponds to a primitive type
(or a string type) then the contents of the \s-1ASN1_STRING\s0 contain the content
octets of the type. If \fBtype\fR corresponds to a constructed type or
a tagged type (V_ASN1_SEQUENCE, V_ASN1_SET or V_ASN1_OTHER) then the
\&\s-1ASN1_STRING\s0 contains the entire \s-1ASN.1\s0 encoding verbatim (including tag and
length octets).
.PP
\&\fBASN1_TYPE_cmp()\fR may not return zero if two types are equivalent but have
different encodings. For example the single content octet of the boolean \s-1TRUE\s0
value under \s-1BER\s0 can have any nonzero encoding but \fBASN1_TYPE_cmp()\fR will
only return zero if the values are the same.
.PP
If either or both of the parameters passed to \fBASN1_TYPE_cmp()\fR is \s-1NULL\s0 the
return value is nonzero. Technically if both parameters are \s-1NULL\s0 the two
types could be absent \s-1OPTIONAL\s0 fields and so should match, however, passing
\&\s-1NULL\s0 values could also indicate a programming error (for example an
unparsable type which returns \s-1NULL\s0) for types which do \fBnot\fR match. So
applications should handle the case of two absent values separately.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBASN1_TYPE_get()\fR returns the type of the \s-1ASN1_TYPE\s0 argument.
.PP
\&\fBASN1_TYPE_set()\fR does not return a value.
.PP
\&\fBASN1_TYPE_set1()\fR returns 1 for success and 0 for failure.
.PP
\&\fBASN1_TYPE_cmp()\fR returns 0 if the types are identical and nonzero otherwise.
.PP
\&\fBASN1_TYPE_unpack_sequence()\fR returns a pointer to an \s-1ASN.1\s0 structure or
\&\s-1NULL\s0 on failure.
.PP
\&\fBASN1_TYPE_pack_sequence()\fR return an \s-1ASN1_TYPE\s0 structure if it succeeds or
\&\s-1NULL\s0 on failure.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2015\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

MR SKB