NAME

       X509_get0_distinguishing_id, X509_set0_distinguishing_id, X509_REQ_get0_distinguishing_id,
       X509_REQ_set0_distinguishing_id - get or set the Distinguishing ID for certificate
       operations

SYNOPSIS

        #include <openssl/x509.h>

        ASN1_OCTET_STRING *X509_get0_distinguishing_id(X509 *x);
        void X509_set0_distinguishing_id(X509 *x, ASN1_OCTET_STRING *distid);
        ASN1_OCTET_STRING *X509_REQ_get0_distinguishing_id(X509_REQ *x);
        void X509_REQ_set0_distinguishing_id(X509_REQ *x, ASN1_OCTET_STRING *distid);

DESCRIPTION

       The Distinguishing ID is defined in FIPS 196 as follows:

       Distinguishing  identifier
           Information which unambiguously distinguishes an entity in the authentication process.

       The SM2 signature algorithm requires a Distinguishing ID value when generating and
       verifying a signature, but the Ddistinguishing ID may also find other uses.  In the
       context of SM2, the Distinguishing ID is often referred to as the "SM2 ID".

       For the purpose off verifying a certificate or a certification request, a Distinguishing
       ID may be attached to it, so functions like X509_verify(3) or X509_REQ_verify(3) have easy
       access to that identity for signature verification.

       X509_get0_distinguishing_id() gets the Distinguishing ID value of a certificate x by
       returning an ASN1_OCTET_STRING object which should not be freed by the caller.

       X509_set0_distinguishing_id() assigns distid to the certificate x.  Calling this function
       transfers the memory management of the value to the X509 object, and therefore the value
       that has been passed in should not be freed by the caller after this function has been
       called.

       X509_REQ_get0_distinguishing_id() and X509_REQ_set0_distinguishing_id() have the same
       functionality as X509_get0_distinguishing_id() and X509_set0_distinguishing_id() except
       that they deal with  X509_REQ objects instead of X509.

RETURN VALUES

       X509_set0_distinguishing_id() and X509_REQ_set0_distinguishing_id() do not return a value.

SEE ALSO

       X509_verify(3), SM2(7)

COPYRIGHT

       Copyright 2019-2020 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>.