.\" $OpenBSD: ASN1_INTEGER_get.3,v 1.7 2023/05/22 19:38:04 tb Exp $ .\" selective merge up to: .\" OpenSSL man3/ASN1_INTEGER_get_int64 24a535ea Sep 22 13:14:20 2020 +0100 .\" .\" This file is a derived work. .\" The changes are covered by the following Copyright and license: .\" .\" Copyright (c) 2018, 2021, 2022 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: May 22 2023 $ .Dt ASN1_INTEGER_GET 3 .Os .Sh NAME .Nm ASN1_INTEGER_get_uint64 , .Nm ASN1_INTEGER_get_int64 , .Nm ASN1_INTEGER_get , .Nm ASN1_INTEGER_set_uint64 , .Nm ASN1_INTEGER_set_int64 , .Nm ASN1_INTEGER_set , .Nm ASN1_INTEGER_cmp , .Nm ASN1_INTEGER_dup , .Nm BN_to_ASN1_INTEGER , .Nm ASN1_INTEGER_to_BN , .Nm ASN1_ENUMERATED_get_int64 , .Nm ASN1_ENUMERATED_get , .Nm ASN1_ENUMERATED_set_int64 , .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 int .Fo ASN1_INTEGER_get_uint64 .Fa "uint64_t *out_val" .Fa "const ASN1_INTEGER *a" .Fc .Ft int .Fo ASN1_INTEGER_get_int64 .Fa "int64_t *out_val" .Fa "const ASN1_INTEGER *a" .Fc .Ft long .Fo ASN1_INTEGER_get .Fa "const ASN1_INTEGER *a" .Fc .Ft int .Fo ASN1_INTEGER_set_uint64 .Fa "ASN1_INTEGER *a" .Fa "uint64_t v" .Fc .Ft int .Fo ASN1_INTEGER_set_int64 .Fa "ASN1_INTEGER *a" .Fa "int64_t v" .Fc .Ft int .Fo ASN1_INTEGER_set .Fa "ASN1_INTEGER *a" .Fa "long v" .Fc .Ft int .Fo ASN1_INTEGER_cmp .Fa "const ASN1_INTEGER *a1" .Fa "const ASN1_INTEGER *a2" .Fc .Ft ASN1_INTEGER * .Fo ASN1_INTEGER_dup .Fa "const ASN1_INTEGER *a" .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 int .Fo ASN1_ENUMERATED_get_int64 .Fa "int64_t *out_val" .Fa "const ASN1_ENUMERATED *a" .Fc .Ft long .Fo ASN1_ENUMERATED_get .Fa "const ASN1_ENUMERATED *a" .Fc .Ft int .Fo ASN1_ENUMERATED_set_int64 .Fa "ASN1_ENUMERATED *a" .Fa "int64_t v" .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_uint64 and .Fn ASN1_INTEGER_get_int64 store the value of .Fa a in .Pf * Fa out_val if successful. .Pp The deprecated function .Fn ASN1_INTEGER_get converts .Fa a to the .Vt long type. .Pp .Fn ASN1_INTEGER_set_uint64 , .Fn ASN1_INTEGER_set_int64 , and .Fn ASN1_INTEGER_set set the type of .Fa a to .Dv V_ASN1_INTEGER or .Dv V_ASN1_NEG_INTEGER depending on the sign of .Fa v and set the value of .Fa a to .Fa v . .Pp .Fn ASN1_INTEGER_cmp compares the signed integer numbers represented by .Fa a1 and .Fa a2 . .Pp .Fn ASN1_INTEGER_dup does exactly the same as .Xr ASN1_STRING_dup 3 without providing any type safety, except that it fails if the .Xr ASN1_STRING_length 3 of .Fa a is 0. .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_int64 , .Fn ASN1_ENUMERATED_get , .Fn ASN1_ENUMERATED_set_int64 , .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_uint64 returns 1 in case of success or 0 if .Fa a is not of the type .Dv V_ASN1_INTEGER or greater than .Dv UINT64_MAX . .Pp .Fn ASN1_INTEGER_get_int64 returns 1 in case of success or 0 if .Fa a is not of the type .Dv V_ASN1_INTEGER or .Dv V_ASN1_NEG_INTEGER , less than .Dv INT64_MIN , or greater than .Dv INT64_MAX . .Pp .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_uint64 , .Fn ASN1_INTEGER_set_int64 , .Fn ASN1_INTEGER_set , .Fn ASN1_ENUMERATED_set_int64 , and .Fn ASN1_ENUMERATED_set return 1 for success or 0 for failure. They only fail if a memory allocation error occurs. .Pp .Fn ASN1_INTEGER_cmp returns a value greater than, equal to, or less than 0 if the signed integer number represented by .Fa a1 is greater than, equal to, or less than the signed integer number represented by .Fa a2 , respectively. .Pp .Fn ASN1_INTEGER_dup returns a pointer to a newly allocated .Vt ASN1_STRING structure or .Dv NULL if .Fa a is a .Dv NULL pointer, if the length of .Fa a is 0, or if memory allocation fails. .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 SEE ALSO .Xr ASN1_INTEGER_new 3 , .Xr ASN1_STRING_length 3 .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. .Fn ASN1_INTEGER_cmp and .Fn ASN1_INTEGER_dup first appeared in SSLeay 0.6.5. 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 . .Pp .Fn ASN1_INTEGER_get_uint64 , .Fn ASN1_INTEGER_get_int64 , .Fn ASN1_INTEGER_set_uint64 , .Fn ASN1_INTEGER_set_int64 , .Fn ASN1_ENUMERATED_get_int64 , and .Fn ASN1_ENUMERATED_set_int64 first appeared in OpenSSL 1.1.0 and have been available since .Ox 7.2 . .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. .Sh BUGS .Fn ASN1_INTEGER_cmp , .Fn ASN1_INTEGER_dup , and .Fn ASN1_INTEGER_to_BN do not check whether their arguments are really of the type .Dv V_ASN1_INTEGER or .Dv V_ASN1_NEG_INTEGER . They may report success even if their arguments are of a wrong type. Consequently, even in case of success, the return value of .Fn ASN1_INTEGER_dup is not guaranteed to be of the type .Dv V_ASN1_INTEGER or .Dv V_ASN1_NEG_INTEGER either. .Pp Similarly, .Fn ASN1_ENUMERATED_to_BN does not check whether its argument is really of the type .Dv V_ASN1_ENUMERATED or .Dv V_ASN1_NEG_ENUMERATED and may report success even if the argument is of a wrong type.