ASN1_INTEGER_GET_INT64(3ossl)

📦 version 3.5.0, in opensuse-leap 16.0

💅 ASN1_INTEGER_GET_INT64(3ossl) — OpenSSL manual, group-chat edition

okay so bestie, you found the 3ossl page and yes it's literally about turning ASN.1 integers into numbers your C code can actually hold 🫶 let's get into it, no cap.

✨ 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 — all of them, the whole squad, here to do ASN.1 INTEGER and ENUMERATED utilities 💖

🌸 SYNOPSIS 🌸

like, copy-paste this exactly, don't improvise:

#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 🦋

So the whole vibe here: these functions convert to and from ASN1_INTEGER and ASN1_ENUMERATED structures. That's it, that's the job 💅

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. main character energy, honestly 👑

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. no negative vibes allowed 🙈

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. like, please use the new one, it's giving clarity ✨

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. recycling era ♻️

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. same energy, opposite direction 🔁

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. twins fr fr 👯

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. that 0xffffffffL is lowkey a jumpscare 😭

🎀 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. so like, know your data, bestie 🧚

💀 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.

translation: yes they still work, no you don't want to be relying on them 🫶 legacy icon but do not touch

⭐ 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 🌈

👑 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. vintage but make it useful 💜

Copyright 2015-2020 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>.

okay that's the whole page, you ate that 🍓 this was ASN1_INTEGER_GET_INT64(3ossl) from the OpenSSL fam, version 3.5.0, dated 2026-09-25 — mwah, go convert some integers bestie 💅✨

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