X509_NAME_hash_ex, X509_NAME_hash, X509_get_subject_name, X509_set_subject_name, X509_subject_name_hash,

       In case X509_NAME_hash(), X509_subject_name_hash(), or X509_issuer_name_hash() returns 0 it remains
       unclear if this is the real hash value or due to failure.  Better use X509_NAME_hash_ex() instead.

       Copyright 2015-2024 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>.

3.5.0                                              2025-06-04                        X509_GET_SUBJECT_NAME(3SSL)

X509_NAME_hash_ex() returns a hash value of name x or 0 on failure, using any given library context
       libctx and property query propq.  The ok result argument may be NULL or else is used to return 1 for
       success and 0 for failure.  Failure may happen on malloc error or if no SHA1 implementation is available.

       X509_NAME_hash() returns a hash value of name x or 0 on failure, using the default library context and
       default property query.

       X509_get_subject_name() returns the subject name of certificate x. The returned value is an internal
       pointer which MUSTNOT be freed. xMUSTNOT be NULL.

       X509_set_subject_name() sets the issuer name of certificate x to name. The name parameter is copied
       internally and should be freed up when it is no longer needed.

       X509_subject_name_hash() returns a hash value of the subject name of certificate x.

       X509_get_issuer_name(), X509_set_issuer_name(), and X509_issuer_name_hash() are identical to
       X509_get_subject_name(), X509_set_subject_name(), and X509_subject_name_hash() except they relate to the
       issuer name of x.

       Similarly X509_REQ_get_subject_name(), X509_REQ_set_subject_name(), X509_ACERT_get0_issuerName(),
       X509_ACERT_set1_issuerName(), X509_CRL_get_issuer() and X509_CRL_set_issuer_name() get or set the subject
       or issuer names of certificate requests of CRLs respectively.

       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 X509_ACERT_set0_holder_entityName(3).

X509_REQ_get_subject_name() is a function in OpenSSL 1.1.0 and a macro in earlier versions.

       X509_CRL_get_issuer() is a function in OpenSSL 1.1.0. It was previously added in OpenSSL 1.0.0 as a
       macro.

       X509_NAME_hash() was turned into a macro and deprecated in OpenSSL 3.0.

       X509_ACERT_get0_issuerName(), X509_ACERT_set1_issuerName() were added in OpenSSL 3.4.

       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

X509_get_subject_name(), X509_get_issuer_name(), X509_REQ_get_subject_name()X509_ACERT_get0_issuerName()
       and X509_CRL_get_issuer() return an X509_NAME pointer.

       X509_NAME_hash_ex(), X509_NAME_hash(), X509_subject_name_hash() and X509_issuer_name_hash() return the
       first four bytes of the SHA1 hash value, converted to unsignedlong in little endian order, or 0 on
       failure.

       X509_set_subject_name(), X509_set_issuer_name(), X509_REQ_set_subject_name(),
       X509_ACERT_get0_issuerName() and X509_CRL_set_issuer_name() return 1 for success and 0 for failure.

d2i_X509(3), ERR_get_error(3), d2i_X509(3) X509_CRL_get0_by_serial(3), X509_get0_signature(3),
       X509_get_ext_d2i(3), X509_get_extension_flags(3), X509_get_pubkey(3), X509_NAME_add_entry_by_txt(3),
       X509_NAME_ENTRY_get_object(3), X509_NAME_get_index_by_NID(3), X509_NAME_print_ex(3), X509_new(3),
       X509_sign(3), X509V3_get_d2i(3), X509_verify_cert(3)

        #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);

       The following macro has been deprecated since OpenSSL 3.0, and can be hidden entirely by defining
       OPENSSL_API_COMPAT with a suitable version value, see openssl_user_macros(7):

        #define X509_NAME_hash(x) X509_NAME_hash_ex(x, NULL, NULL, NULL)