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ASN1_TYPE_GET(3)		    OpenSSL		      ASN1_TYPE_GET(3)

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

SYNOPSIS
	#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);

DESCRIPTION
       These functions allow an	ASN1_TYPE structure to be manipulated. The
       ASN1_TYPE structure can contain any ASN.1 type or constructed type such
       as a SEQUENCE: it is effectively	equivalent to the ASN.1	ANY type.

       ASN1_TYPE_get() returns the type	of a.

       ASN1_TYPE_set() sets the	value of a to type and value. This function
       uses the	pointer	value internally so it must not	be freed up after the
       call.

       ASN1_TYPE_set1()	sets the value of a to type a copy of value.

       ASN1_TYPE_cmp() compares	ASN.1 types a and b and	returns	0 if they are
       identical and nonzero otherwise.

       ASN1_TYPE_unpack_sequence() attempts to parse the SEQUENCE present in t
       using the ASN.1 structure it. If	successful it returns a	pointer	to the
       ASN.1 structure corresponding to	it which must be freed by the caller.
       If it fails it return NULL.

       ASN1_TYPE_pack_sequence() attempts to encode the	ASN.1 structure	s
       corresponding to	it into	an ASN1_TYPE. If successful the	encoded
       ASN1_TYPE is returned. If t and *t are not NULL the encoded type	is
       written to t overwriting	any existing data. If t	is not NULL but	*t is
       NULL the	returned ASN1_TYPE is written to *t.

NOTES
       The type	and meaning of the value parameter for ASN1_TYPE_set() and
       ASN1_TYPE_set1()	is determined by the type parameter.  If type is
       V_ASN1_NULL value is ignored. If	type is	V_ASN1_BOOLEAN then the
       boolean is set to TRUE if value is not NULL. If type is V_ASN1_OBJECT
       then value is an	ASN1_OBJECT structure. Otherwise type is and
       ASN1_STRING structure. If type corresponds to a primitive type (or a
       string type) then the contents of the ASN1_STRING contain the content
       octets of the type. If type corresponds to a constructed	type or	a
       tagged type (V_ASN1_SEQUENCE, V_ASN1_SET	or V_ASN1_OTHER) then the
       ASN1_STRING contains the	entire ASN.1 encoding verbatim (including tag
       and length octets).

       ASN1_TYPE_cmp() may not return zero if two types	are equivalent but
       have different encodings. For example the single	content	octet of the
       boolean TRUE value under	BER can	have any nonzero encoding but
       ASN1_TYPE_cmp() will only return	zero if	the values are the same.

       If either or both of the	parameters passed to ASN1_TYPE_cmp() is	NULL
       the return value	is nonzero. Technically	if both	parameters are NULL
       the two types could be absent OPTIONAL fields and so should match,
       however,	passing	NULL values could also indicate	a programming error
       (for example an unparsable type which returns NULL) for types which do
       not match. So applications should handle	the case of two	absent values
       separately.

RETURN VALUES
       ASN1_TYPE_get() returns the type	of the ASN1_TYPE argument.

       ASN1_TYPE_set() does not	return a value.

       ASN1_TYPE_set1()	returns	1 for success and 0 for	failure.

       ASN1_TYPE_cmp() returns 0 if the	types are identical and	nonzero
       otherwise.

       ASN1_TYPE_unpack_sequence() returns a pointer to	an ASN.1 structure or
       NULL on failure.

       ASN1_TYPE_pack_sequence() return	an ASN1_TYPE structure if it succeeds
       or NULL on failure.

COPYRIGHT
       Copyright 2015-2020 The OpenSSL Project Authors.	All Rights Reserved.

       Licensed	under the OpenSSL license (the "License").  You	may not	use
       this file except	in compliance with the License.	 You can obtain	a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.

1.1.1k				  2021-03-25		      ASN1_TYPE_GET(3)
NAME | SYNOPSIS | DESCRIPTION | NOTES | RETURN VALUES | COPYRIGHT

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