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_CRL_get_issuer, X509_CRL_set_issuer_name - get X509_NAME hashes or get
       and set issuer or subject names

SYNOPSIS

        #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);

       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)

DESCRIPTION

       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 MUST NOT be freed.

       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_CRL_get_issuer() and
       X509_CRL_set_issuer_name() get or set the subject or issuer names of certificate requests of CRLs
       respectively.

RETURN VALUES

       X509_get_subject_name(), X509_get_issuer_name(), X509_REQ_get_subject_name() 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 unsigned long in little endian order, or 0 on
       failure.

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

BUGS

       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.

SEE ALSO

       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)

HISTORY

       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.

COPYRIGHT

       Copyright 2015-2021 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>.