.\" $OpenBSD: ASN1_INTEGER_get.3,v 1.1 2018/07/08 23:00:17 schwarze Exp $ .\" selective merge up to: .\" OpenSSL man3/ASN1_INTEGER_get_int64 eaf39a9f Jun 23 10:24:00 2018 +0200 .\" .\" This file was written by Dr. Stephen Henson . .\" Copyright (c) 2015 The OpenSSL Project. All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in .\" the documentation and/or other materials provided with the .\" distribution. .\" .\" 3. 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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: July 8 2018 $ .Dt ASN1_INTEGER_GET 3 .Os .Sh NAME .Nm ASN1_INTEGER_get , .Nm ASN1_INTEGER_set , .Nm BN_to_ASN1_INTEGER , .Nm ASN1_INTEGER_to_BN , .Nm ASN1_ENUMERATED_get , .Nm ASN1_ENUMERATED_set , .Nm BN_to_ASN1_ENUMERATED , .Nm ASN1_ENUMERATED_to_BN .Nd ASN.1 INTEGER and ENUMERATED utilities .Sh SYNOPSIS .In openssl/asn1.h .Ft long .Fo ASN1_INTEGER_get .Fa "const ASN1_INTEGER *a" .Fc .Ft int .Fo ASN1_INTEGER_set .Fa "ASN1_INTEGER *a" .Fa "long v" .Fc .Ft ASN1_INTEGER * .Fo BN_to_ASN1_INTEGER .Fa "const BIGNUM *bn" .Fa "ASN1_INTEGER *ai" .Fc .Ft BIGNUM * .Fo ASN1_INTEGER_to_BN .Fa "const ASN1_INTEGER *ai" .Fa "BIGNUM *bn" .Fc .Ft long .Fo ASN1_ENUMERATED_get .Fa "const ASN1_ENUMERATED *a" .Fc .Ft int .Fo ASN1_ENUMERATED_set .Fa "ASN1_ENUMERATED *a" .Fa "long v" .Fc .Ft ASN1_ENUMERATED * .Fo BN_to_ASN1_ENUMERATED .Fa "const BIGNUM *bn" .Fa "ASN1_ENUMERATED *ai" .Fc .Ft BIGNUM * .Fo ASN1_ENUMERATED_to_BN .Fa "const ASN1_ENUMERATED *ai" .Fa "BIGNUM *bn" .Fc .Sh DESCRIPTION These functions convert to and from .Vt ASN1_INTEGER and .Vt ASN1_ENUMERATED objects. .Pp .Fn ASN1_INTEGER_get converts .Fa a to the .Vt long type. .Pp .Fn ASN1_INTEGER_set sets the value of .Fa a to .Fa v . .Pp .Fn BN_to_ASN1_INTEGER converts .Fa bn to an .Vt ASN1_INTEGER . If .Fa ai is .Dv NULL , a new .Vt ASN1_INTEGER object is returned. Otherwise, the existing object .Fa ai is used instead. .Pp .Fn ASN1_INTEGER_to_BN converts .Fa ai into a .Vt BIGNUM . If .Fa bn is .Dv NULL , a new .Vt BIGNUM object is returned. Otherwise, the existing object .Fa bn is used instead. .Pp .Fn ASN1_ENUMERATED_get , .Fn ASN1_ENUMERATED_set , .Fn BN_to_ASN1_ENUMERATED , and .Fn ASN1_ENUMERATED_to_BN behave like their .Vt ASN1_INTEGER counterparts except that they operate on an .Vt ASN1_ENUMERATED object. .Sh RETURN VALUES .Fn ASN1_INTEGER_get and .Fn ASN1_ENUMERATED_get return the converted value, 0 if .Fa a is .Dv NULL , or \-1 on error, which is ambiguous because \-1 is a legitimate value for an .Vt ASN1_INTEGER . .Pp .Fn ASN1_INTEGER_set and .Fn ASN1_ENUMERATED_set return 1 for success or 0 for failure. They only fail if a memory allocation error occurs. .Pp .Fn BN_to_ASN1_INTEGER and .Fn BN_to_ASN1_ENUMERATED return an .Vt ASN1_INTEGER or .Vt ASN1_ENUMERATED object, respectively, or .Dv NULL if an error occurs. They only fail due to memory allocation errors. .Pp .Fn ASN1_INTEGER_to_BN and .Fn ASN1_ENUMERATED_to_BN return a .Vt BIGNUM object of .Dv NULL if an error occurs. They can fail if the passed type is incorrect (due to a programming error) or due to memory allocation failures. .Sh HISTORY .Fn ASN1_INTEGER_set first appeared in SSLeay 0.5.1. .Fn ASN1_INTEGER_get , .Fn BN_to_ASN1_INTEGER , and .Fn ASN1_INTEGER_to_BN first appeared in SSLeay 0.6.0. These functions have been available since .Ox 2.3 . .Pp .Fn ASN1_ENUMERATED_get , .Fn ASN1_ENUMERATED_set , .Fn BN_to_ASN1_ENUMERATED , and .Fn ASN1_ENUMERATED_to_BN first appeared in OpenSSL 0.9.2b and have been available since .Ox 2.6 . .Sh CAVEATS In general an .Vt ASN1_INTEGER or .Vt ASN1_ENUMERATED type can contain an integer of almost arbitrary size and so cannot always be represented by a C .Vt long type. The ambiguous return values of .Fn ASN1_INTEGER_get and .Fn ASN1_ENUMERATED_get imply that these functions should be avoided if possible.