ASIDENTIFIERS_NEW(3) | Library Functions Manual | ASIDENTIFIERS_NEW(3)

# NAME

`ASIdentifiers_new`, `ASIdentifiers_free`, `d2i_ASIdentifiers`, `i2d_ASIdentifiers` — RFC 3779 autonomous system identifier delegation extensions

# SYNOPSIS

library “libcrypto”
`#include <openssl/x509v3.h>`

ASIdentifiers *
`ASIdentifiers_new`(void);

void
`ASIdentifiers_free`(ASIdentifiers *asid);

ASIdentifiers *
`d2i_ASIdentifiers`(ASIdentifiers **asid, const unsigned char **in, long len);

int
`i2d_ASIdentifiers`(ASIdentifiers *asid, unsigned char **out);

# DESCRIPTION

RFC 3779 defines two X.509v3 certificate extensions that allow the delegation of IP addresses and autonomous system (AS) identifiers from the issuer to the subject of the certificate. An ASIdentifiers object contains collections of individual AS numbers and ranges of AS numbers to be delegated.

`ASIdentifiers_new`() allocates and initializes a new, empty ASIdentifiers object that can be populated with X509v3_asid_add_id_or_range(3). See ASRange_new(3) for implementation details.

`ASIdentifiers_free`() frees asid including any data contained in it. If asid is `NULL`, no action occurs.

`d2i_ASIdentifiers`() and `i2d_ASIdentifiers`() decode and encode ASN.1 ASIdentifiers objects as defined in RFC 3779, section 3.2.3.1. For details about the semantics, examples, caveats, and bugs, see ASN1_item_d2i(3). In order for the encoding produced by `i2d_ASIdentifiers`() to conform to RFC 3779, asid must be in “canonical form”, see X509v3_asid_canonize(3).

# RETURN VALUES

`ASIdentifiers_new`() returns a new ASIdentifiers object or `NULL` if an error occurs.

`d2i_ASIdentifiers`() returns an ASIdentifiers object or `NULL` if a decoding or memory allocation error occurs.

`i2d_ASIdentifiers`() returns the number of bytes successfully encoded or a value <= 0 if an error occurs.

# SEE ALSO

ASRange_new(3), crypto(3), IPAddressRange_new(3), X509_new(3), X509v3_addr_add_inherit(3), X509v3_addr_get_range(3), X509v3_addr_inherits(3), X509v3_addr_subset(3), X509v3_addr_validate_path(3), X509v3_asid_add_id_or_range(3)

# STANDARDS

RFC 3779: X.509 Extensions for IP Addresses and AS Identifiers:

- section 3: Autonomous System Identifier Delegation Extension

RFC 7020: The Internet Numbers Registry System

RFC 7249: Internet Numbers Registries

# HISTORY

These functions first appeared in OpenSSL 0.9.8e and have been available since OpenBSD 7.1.

# BUGS

There are no corresponding functions for the RFC 3779 IP address delegation extension represented by IPAddrBlocks.

June 8, 2025 | Debian