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.\" ========================================================================
.\"
.IX Title "X509_GET_SUBJECT_NAME 3ossl"
.TH X509_GET_SUBJECT_NAME 3ossl "2026-01-16" "3.5.1" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
X509_NAME_hash_ex, X509_NAME_hash,
X509_get_subject_name, X509_set_subject_name, X509_subject_name_hash,
X509_get_issuer_name, X509_set_issuer_name, X509_issuer_name_hash,
X509_REQ_get_subject_name, X509_REQ_set_subject_name,
X509_ACERT_get0_issuerName, X509_ACERT_set1_issuerName,
X509_CRL_get_issuer, X509_CRL_set_issuer_name \-
get X509_NAME hashes or get and set issuer or subject names
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509.h>
\&
\& unsigned long X509_NAME_hash_ex(const X509_NAME *x, OSSL_LIB_CTX *libctx,
\&                                 const char *propq, int *ok);
\&
\& X509_NAME *X509_get_subject_name(const X509 *x);
\& int X509_set_subject_name(X509 *x, const X509_NAME *name);
\& unsigned long X509_subject_name_hash(X509 *x);
\&
\& X509_NAME *X509_get_issuer_name(const X509 *x);
\& int X509_set_issuer_name(X509 *x, const X509_NAME *name);
\& unsigned long X509_issuer_name_hash(X509 *x);
\&
\& X509_NAME *X509_REQ_get_subject_name(const X509_REQ *req);
\& int X509_REQ_set_subject_name(X509_REQ *req, const X509_NAME *name);
\&
\& X509_NAME *X509_CRL_get_issuer(const X509_CRL *crl);
\& int X509_CRL_set_issuer_name(X509_CRL *x, const X509_NAME *name);
\&
\& #include <openssl/x509_acert.h>
\&
\& X509_NAME *X509_ACERT_get0_issuerName(const X509_ACERT *x);
\& int X509_ACERT_set1_issuerName(X509_ACERT *x, const X509_NAME *name);
.Ve
.PP
The following macro has been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining \fB\s-1OPENSSL_API_COMPAT\s0\fR with a suitable version value,
see \fBopenssl_user_macros\fR\|(7):
.PP
.Vb 1
\& #define X509_NAME_hash(x) X509_NAME_hash_ex(x, NULL, NULL, NULL)
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBX509_NAME_hash_ex()\fR returns a hash value of name \fIx\fR or 0 on failure,
using any given library context \fIlibctx\fR and property query \fIpropq\fR.
The \fIok\fR result argument may be \s-1NULL\s0
or else is used to return 1 for success and 0 for failure.
Failure may happen on malloc error or if no \s-1SHA1\s0 implementation is available.
.PP
\&\fBX509_NAME_hash()\fR returns a hash value of name \fIx\fR or 0 on failure,
using the default library context and default property query.
.PP
\&\fBX509_get_subject_name()\fR returns the subject name of certificate \fIx\fR. The
returned value is an internal pointer which \fB\s-1MUST NOT\s0\fR be freed. \fIx\fR \fB\s-1MUST NOT\s0\fR be \s-1NULL.\s0
.PP
\&\fBX509_set_subject_name()\fR sets the issuer name of certificate \fIx\fR to
\&\fIname\fR. The \fIname\fR parameter is copied internally and should be freed
up when it is no longer needed.
.PP
\&\fBX509_subject_name_hash()\fR returns a hash value of the subject name of
certificate \fIx\fR.
.PP
\&\fBX509_get_issuer_name()\fR, \fBX509_set_issuer_name()\fR, and \fBX509_issuer_name_hash()\fR
are identical to
\&\fBX509_get_subject_name()\fR, \fBX509_set_subject_name()\fR, and \fBX509_subject_name_hash()\fR
except they relate to the issuer name of \fIx\fR.
.PP
Similarly \fBX509_REQ_get_subject_name()\fR, \fBX509_REQ_set_subject_name()\fR,
\&\fBX509_ACERT_get0_issuerName()\fR, \fBX509_ACERT_set1_issuerName()\fR,
\&\fBX509_CRL_get_issuer()\fR and \fBX509_CRL_set_issuer_name()\fR get or set the subject
or issuer names of certificate requests of CRLs respectively.
.PP
Since attribute certificates do not have a subject name, only the issuer name
can be set.  For details on setting X509_ACERT holder identities, see
\&\fBX509_ACERT_set0_holder_entityName\fR\|(3).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBX509_get_subject_name()\fR, \fBX509_get_issuer_name()\fR, \fBX509_REQ_get_subject_name()\fR
\&\fBX509_ACERT_get0_issuerName()\fR and \fBX509_CRL_get_issuer()\fR return
an \fBX509_NAME\fR pointer.
.PP
\&\fBX509_NAME_hash_ex()\fR, \fBX509_NAME_hash()\fR,
\&\fBX509_subject_name_hash()\fR and \fBX509_issuer_name_hash()\fR
return the first four bytes of the \s-1SHA1\s0 hash value,
converted to \fBunsigned long\fR in little endian order,
or 0 on failure.
.PP
\&\fBX509_set_subject_name()\fR, \fBX509_set_issuer_name()\fR, \fBX509_REQ_set_subject_name()\fR,
\&\fBX509_ACERT_get0_issuerName()\fR and \fBX509_CRL_set_issuer_name()\fR return 1 for
success and 0 for failure.
.SH "BUGS"
.IX Header "BUGS"
In case \fBX509_NAME_hash()\fR, \fBX509_subject_name_hash()\fR, or \fBX509_issuer_name_hash()\fR
returns 0 it remains unclear if this is the real hash value or due to failure.
Better use \fBX509_NAME_hash_ex()\fR instead.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBd2i_X509\fR\|(3),
\&\fBERR_get_error\fR\|(3), \fBd2i_X509\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_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_REQ_get_subject_name()\fR is a function in OpenSSL 1.1.0 and a macro in
earlier versions.
.PP
\&\fBX509_CRL_get_issuer()\fR is a function in OpenSSL 1.1.0. It was previously
added in OpenSSL 1.0.0 as a macro.
.PP
\&\fBX509_NAME_hash()\fR was turned into a macro and deprecated in OpenSSL 3.0.
.PP
\&\fBX509_ACERT_get0_issuerName()\fR, \fBX509_ACERT_set1_issuerName()\fR
were 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 \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
