OCSP_cert_to_id, OCSP_cert_id_new, OCSP_CERTID_free, OCSP_id_issuer_cmp, OCSP_id_cmp, OCSP_id_get0_info -

       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                              OCSP_CERT_TO_ID(3SSL)

OCSP_cert_to_id() creates and returns a new OCSP_CERTID structure using message digest dgst for
       certificate subject with issuer issuer. If dgst is NULL then SHA1 is used.

       OCSP_cert_id_new() creates and returns a new OCSP_CERTID using dgst and issuer name issuerName, issuer
       key hash issuerKey and serial number serialNumber.

       OCSP_CERTID_free() frees up id.  If the argument is NULL, nothing is done.

       OCSP_id_cmp() compares OCSP_CERTIDa and b.

       OCSP_id_issuer_cmp() compares only the issuer name of OCSP_CERTIDa and b.

       OCSP_id_get0_info() returns the issuer name hash, hash OID, issuer key hash and serial number contained
       in cid. If any of the values are not required the corresponding parameter can be set to NULL.

       OCSP_cert_to_id, OCSP_cert_id_new, OCSP_CERTID_free, OCSP_id_issuer_cmp, OCSP_id_cmp, OCSP_id_get0_info -
       OCSP certificate ID utility functions

       OCSP clients will typically only use OCSP_cert_to_id() or OCSP_cert_id_new(): the other functions are
       used by responder applications.

       The values returned by OCSP_id_get0_info() are internal pointers and MUSTNOT be freed up by an
       application: they will be freed when the corresponding OCSP_CERTID structure is freed.

OCSP_cert_to_id() and OCSP_cert_id_new() return either a pointer to a valid OCSP_CERTID structure or NULL
       if an error occurred.

       OCSP_id_cmp() and OCSP_id_issuer_cmp() returns zero for a match and nonzero otherwise.

       OCSP_CERTID_free() does not return a value.

       OCSP_id_get0_info() returns 1 for success and 0 for failure.

crypto(7), OCSP_request_add1_nonce(3), OCSP_REQUEST_new(3), OCSP_resp_find_status(3),
       OCSP_response_status(3), OCSP_sendreq_new(3)

        #include <openssl/ocsp.h>

        OCSP_CERTID *OCSP_cert_to_id(const EVP_MD *dgst,
                                     X509 *subject, X509 *issuer);

        OCSP_CERTID *OCSP_cert_id_new(const EVP_MD *dgst,
                                      X509_NAME *issuerName,
                                      ASN1_BIT_STRING *issuerKey,
                                      ASN1_INTEGER *serialNumber);

        void OCSP_CERTID_free(OCSP_CERTID *id);

        int OCSP_id_issuer_cmp(const OCSP_CERTID *a, const OCSP_CERTID *b);
        int OCSP_id_cmp(const OCSP_CERTID *a, const OCSP_CERTID *b);

        int OCSP_id_get0_info(ASN1_OCTET_STRING **piNameHash, ASN1_OBJECT **pmd,
                              ASN1_OCTET_STRING **pikeyHash,
                              ASN1_INTEGER **pserial, OCSP_CERTID *cid);