NAME

       ASN1_INTEGER_get_uint64, ASN1_INTEGER_set_uint64, ASN1_INTEGER_get_int64,
       ASN1_INTEGER_get, ASN1_INTEGER_set_int64, ASN1_INTEGER_set, BN_to_ASN1_INTEGER,
       ASN1_INTEGER_to_BN, ASN1_ENUMERATED_get_int64, ASN1_ENUMERATED_get,
       ASN1_ENUMERATED_set_int64, ASN1_ENUMERATED_set, BN_to_ASN1_ENUMERATED,
       ASN1_ENUMERATED_to_BN - ASN.1 INTEGER and ENUMERATED utilities

SYNOPSIS

        #include <openssl/asn1.h>

        int ASN1_INTEGER_get_int64(int64_t *pr, const ASN1_INTEGER *a);
        long ASN1_INTEGER_get(const ASN1_INTEGER *a);

        int ASN1_INTEGER_set_int64(ASN1_INTEGER *a, int64_t r);
        int ASN1_INTEGER_set(ASN1_INTEGER *a, long v);

        int ASN1_INTEGER_get_uint64(uint64_t *pr, const ASN1_INTEGER *a);
        int ASN1_INTEGER_set_uint64(ASN1_INTEGER *a, uint64_t r);

        ASN1_INTEGER *BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai);
        BIGNUM *ASN1_INTEGER_to_BN(const ASN1_INTEGER *ai, BIGNUM *bn);

        int ASN1_ENUMERATED_get_int64(int64_t *pr, const ASN1_ENUMERATED *a);
        long ASN1_ENUMERATED_get(const ASN1_ENUMERATED *a);

        int ASN1_ENUMERATED_set_int64(ASN1_ENUMERATED *a, int64_t r);
        int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v);

        ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(const BIGNUM *bn, ASN1_ENUMERATED *ai);
        BIGNUM *ASN1_ENUMERATED_to_BN(const ASN1_ENUMERATED *ai, BIGNUM *bn);

DESCRIPTION

       These functions convert to and from ASN1_INTEGER and ASN1_ENUMERATED structures.

       ASN1_INTEGER_get_int64() converts an ASN1_INTEGER into an int64_t type If successful it
       returns 1 and sets *pr to the value of a. If it fails (due to invalid type or the value
       being too big to fit into an int64_t type) it returns 0.

       ASN1_INTEGER_get_uint64() is similar to ASN1_INTEGER_get_int64_t() except it converts to a
       uint64_t type and an error is returned if the passed integer is negative.

       ASN1_INTEGER_get() also returns the value of a but it returns 0 if a is NULL and -1 on
       error (which is ambiguous because -1 is a legitimate value for an ASN1_INTEGER). New
       applications should use ASN1_INTEGER_get_int64() instead.

       ASN1_INTEGER_set_int64() sets the value of ASN1_INTEGER a to the int64_t value r.

       ASN1_INTEGER_set_uint64() sets the value of ASN1_INTEGER a to the uint64_t value r.

       ASN1_INTEGER_set() sets the value of ASN1_INTEGER a to the long value v.

       BN_to_ASN1_INTEGER() converts BIGNUM bn to an ASN1_INTEGER. If ai is NULL a new
       ASN1_INTEGER structure is returned. If ai is not NULL then the existing structure will be
       used instead.

       ASN1_INTEGER_to_BN() converts ASN1_INTEGER ai into a BIGNUM. If bn is NULL a new BIGNUM
       structure is returned. If bn is not NULL then the existing structure will be used instead.

       ASN1_ENUMERATED_get_int64(), ASN1_ENUMERATED_set_int64(), ASN1_ENUMERATED_set(),
       BN_to_ASN1_ENUMERATED() and ASN1_ENUMERATED_to_BN() behave in an identical way to their
       ASN1_INTEGER counterparts except they operate on an ASN1_ENUMERATED value.

       ASN1_ENUMERATED_get() returns the value of a in a similar way to ASN1_INTEGER_get() but it
       returns 0xffffffffL if the value of a will not fit in a long type. New applications should
       use ASN1_ENUMERATED_get_int64() instead.

NOTES

       In general an ASN1_INTEGER or ASN1_ENUMERATED type can contain an integer of almost
       arbitrary size and so cannot always be represented by a C int64_t type. However, in many
       cases (for example version numbers) they represent small integers which can be more easily
       manipulated if converted to an appropriate C integer type.

BUGS

       The ambiguous return values of ASN1_INTEGER_get() and ASN1_ENUMERATED_get() mean these
       functions should be avoided if possible. They are retained for compatibility. Normally the
       ambiguous return values are not legitimate values for the fields they represent.

RETURN VALUES

       ASN1_INTEGER_set_int64(), ASN1_INTEGER_set(), ASN1_ENUMERATED_set_int64() and
       ASN1_ENUMERATED_set() return 1 for success and 0 for failure. They will only fail if a
       memory allocation error occurs.

       ASN1_INTEGER_get_int64() and ASN1_ENUMERATED_get_int64() return 1 for success and 0 for
       failure. They will fail if the passed type is incorrect (this will only happen if there is
       a programming error) or if the value exceeds the range of an int64_t type.

       BN_to_ASN1_INTEGER() and BN_to_ASN1_ENUMERATED() return an ASN1_INTEGER or ASN1_ENUMERATED
       structure respectively or NULL if an error occurs. They will only fail due to a memory
       allocation error.

       ASN1_INTEGER_to_BN() and ASN1_ENUMERATED_to_BN() return a BIGNUM structure of NULL if an
       error occurs. They can fail if the passed type is incorrect (due to programming error) or
       due to a memory allocation failure.

SEE ALSO

       ERR_get_error(3)

HISTORY

       ASN1_INTEGER_set_int64(), ASN1_INTEGER_get_int64(), ASN1_ENUMERATED_set_int64() and
       ASN1_ENUMERATED_get_int64() were added in OpenSSL 1.1.0.

COPYRIGHT

       Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (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>.