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.IX Title "X509_GET0_UIDS 3ossl"
.TH X509_GET0_UIDS 3ossl 2026-06-09 3.5.7 OpenSSL
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.SH NAME
X509_get0_uids, X509_ACERT_get0_issuerUID
\&\- get certificate and attribute certificate unique identifiers
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509.h>
\&
\& void X509_get0_uids(const X509 *x, const ASN1_BIT_STRING **piuid,
\&                     const ASN1_BIT_STRING **psuid);
\&
\& #include <openssl/x509_acert.h>
\&
\& ASN1_BIT_STRING *X509_ACERT_get0_issuerUID(X509_ACERT *x);
\&=head1 DESCRIPTION
.Ve
.PP
\&\fBX509_get0_uids()\fR sets \fB*piuid\fR and \fB*psuid\fR to the issuer and subject unique
identifiers of certificate \fBx\fR or NULL if the fields are not present.
.PP
\&\fBX509_ACERT_get0_issuerUID()\fR returns the issuer unique identifier of the
attribute certificate \fBx\fR or NULL if the field is not present.
.SH NOTES
.IX Header "NOTES"
The issuer and subject unique identifier fields are very rarely encountered in
practice outside test cases.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBX509_get0_uids()\fR does not return a value.
.PP
\&\fBX509_ACERT_get0_issuerUID()\fR returns a unique identifier on success or NULL
on failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBd2i_X509\fR\|(3),
\&\fBERR_get_error\fR\|(3),
\&\fBX509_CRL_get0_by_serial\fR\|(3),
\&\fBX509_get0_signature\fR\|(3),
\&\fBX509_get_ext_d2i\fR\|(3),
\&\fBX509_get_extension_flags\fR\|(3),
\&\fBX509_get_pubkey\fR\|(3),
\&\fBX509_get_subject_name\fR\|(3),
\&\fBX509_get_version\fR\|(3),
\&\fBX509_NAME_add_entry_by_txt\fR\|(3),
\&\fBX509_NAME_ENTRY_get_object\fR\|(3),
\&\fBX509_NAME_get_index_by_NID\fR\|(3),
\&\fBX509_NAME_print_ex\fR\|(3),
\&\fBX509_new\fR\|(3),
\&\fBX509_sign\fR\|(3),
\&\fBX509V3_get_d2i\fR\|(3),
\&\fBX509_verify_cert\fR\|(3)
.SH HISTORY
.IX Header "HISTORY"
\&\fBX509_get0_uids()\fR was added in OpenSSL 1.1.0.
.PP
\&\fBX509_ACERT_get0_issuerUID()\fR was added in OpenSSL 3.4.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2015\-2024 The OpenSSL Project Authors. All Rights Reserved.
.PP
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>.
