.\" $OpenBSD: ASN1_TYPE_get.3,v 1.11 2019/08/26 11:41:31 schwarze Exp $ .\" OpenSSL 99d63d46 Mon Jun 6 00:43:05 2016 -0400 .\" .\" This file is a derived work. .\" The changes are covered by the following Copyright and license: .\" .\" Copyright (c) 2017 Ingo Schwarze .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. 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IN NO EVENT SHALL THE OpenSSL PROJECT OR .\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, .\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: August 26 2019 $ .Dt ASN1_TYPE_GET 3 .Os .Sh NAME .Nm ASN1_TYPE_new , .Nm ASN1_TYPE_free , .Nm ASN1_TYPE_get , .Nm ASN1_TYPE_set , .Nm ASN1_TYPE_set1 , .Nm ASN1_TYPE_cmp .Nd ASN.1 objects of arbitrary type .Sh SYNOPSIS .In openssl/asn1.h .Ft ASN1_TYPE * .Fn ASN1_TYPE_new void .Ft void .Fn ASN1_TYPE_free "ASN1_TYPE *a" .Ft int .Fo ASN1_TYPE_get .Fa "const ASN1_TYPE *a" .Fc .Ft void .Fo ASN1_TYPE_set .Fa "ASN1_TYPE *a" .Fa "int type" .Fa "void *value" .Fc .Ft int .Fo ASN1_TYPE_set1 .Fa "ASN1_TYPE *a" .Fa "int type" .Fa "const void *value" .Fc .Ft int .Fo ASN1_TYPE_cmp .Fa "const ASN1_TYPE *a" .Fa "const ASN1_TYPE *b" .Fc .Sh DESCRIPTION .Vt ASN1_TYPE represents the ASN.1 ANY type. An .Vt ASN1_TYPE object can store an ASN.1 value of arbitrary type, including constructed types such as a SEQUENCE. It also remembers internally which type it currently holds. .Pp .Fn ASN1_TYPE_new allocates and initializes an empty .Vt ASN1_TYPE object of undefined type. .Pp .Fn ASN1_TYPE_free frees .Fa a including the value stored in it, if any. If .Fa a is a .Dv NULL pointer, no action occurs. .Pp .Fn ASN1_TYPE_get returns the type of .Fa a , represented by one of the .Dv V_ASN1_* constants defined in .In openssl/asn1.h . .Pp .Fn ASN1_TYPE_set frees the value contained in .Fa a , if any, and sets .Fa a to .Fa type and .Fa value . This function uses the pointer .Fa value internally so it must .Sy not be freed up after the call. .Pp .Fn ASN1_TYPE_set1 sets the type of .Fa a to .Fa type and its value to a copy of .Fa value . If copying succeeds, the previous value that was contained in .Fa a is freed. If copying fails, .Fa a remains unchanged. .Pp The type and meaning of the .Fa value argument of .Fn ASN1_TYPE_set and .Fn ASN1_TYPE_set1 is determined by the .Fa type argument. If .Fa type is .Dv V_ASN1_NULL , .Fa value is ignored. If .Fa type is .Dv V_ASN1_BOOLEAN , then the boolean is set to TRUE if .Fa value is not .Dv NULL . If .Fa type is .Dv V_ASN1_OBJECT , then .Fa value is an .Vt ASN1_OBJECT structure. Otherwise .Fa type is an .Vt ASN1_STRING structure. If .Fa type corresponds to a primitive type or a string type, then the contents of the .Vt ASN1_STRING contains the content octets of the type. If .Fa type corresponds to a constructed type or a tagged type .Pq Dv V_ASN1_SEQUENCE , V_ASN1_SET , No or Dv V_ASN1_OTHER , then the .Vt ASN1_STRING contains the entire ASN.1 encoding verbatim, including tag and length octets. .Pp .Fn ASN1_TYPE_cmp checks that .Fa a and .Fa b have the same type, the same value, and are encoded in the same way. .Pp If the types agree and the values have the same meaning but are encoded differently, they are considered different. For example, a boolean value is represented using a single content octet. Under BER, any non-zero octet represents the TRUE value, but .Fn ASN1_TYPE_cmp will only report a match if the content octet is the same. .Pp If either or both of the arguments passed to .Fn ASN1_TYPE_cmp is .Dv NULL , the result is a mismatch. Technically, if both arguments are .Dv NULL , the two types could be absent OPTIONAL fields and so should match, however passing .Dv NULL values could also indicate a programming error (for example an unparseable type which returns .Dv NULL ) for types which do .Sy not match. So applications should handle the case of two absent values separately. .Sh RETURN VALUES .Fn ASN1_TYPE_new returns the new .Vt ASN1_TYPE object or .Dv NULL if an error occurs. .Pp .Fn ASN1_TYPE_get returns the type of .Fa a or 0 if an error occurs. The latter can happen if .Fa a does not contain a value even though its type is not .Dv V_ASN1_NULL . For example, it will always happen for empty objects newly constructed with .Fn ASN1_TYPE_new . .Pp .Fn ASN1_TYPE_set1 returns 1 if the copying succeeds or 0 if it fails. .Pp .Fn ASN1_TYPE_cmp returns 0 for a match or non-zero for a mismatch. .Sh SEE ALSO .Xr ASN1_generate_nconf 3 , .Xr ASN1_item_free 3 , .Xr ASN1_OBJECT_new 3 , .Xr ASN1_put_object 3 , .Xr ASN1_STRING_dup 3 , .Xr ASN1_STRING_new 3 , .Xr crypto 3 , .Xr d2i_ASN1_NULL 3 , .Xr d2i_ASN1_SEQUENCE_ANY 3 , .Xr d2i_ASN1_TYPE 3 , .Xr OBJ_dup 3 .Sh HISTORY .Fn ASN1_TYPE_new and .Fn ASN1_TYPE_free first appeared in SSLeay 0.5.1. .Fn ASN1_TYPE_get and .Fn ASN1_TYPE_set first appeared in SSLeay 0.8.0. These functions have been available since .Ox 2.4 . .Pp .Fn ASN1_TYPE_set1 first appeared in OpenSSL 0.9.8h and has been available since .Ox 4.5 . .Pp .Fn ASN1_TYPE_cmp first appeared in OpenSSL 0.9.8zd, 1.0.0p, and 1.0.1k and has been available since .Ox 4.9 .