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OSSL_ESS_check_signing_certs(3)     OpenSSL    OSSL_ESS_check_signing_certs(3)



NAME
       OSSL_ESS_signing_cert_new_init, OSSL_ESS_signing_cert_v2_new_init,
       OSSL_ESS_check_signing_certs - Enhanced Security Services (ESS)
       functions

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/ess.h>

        ESS_SIGNING_CERT *OSSL_ESS_signing_cert_new_init(const X509 *signcert,
                                                         const STACK_OF(X509) *certs,
                                                         int set_issuer_serial);
        ESS_SIGNING_CERT_V2 *OSSL_ESS_signing_cert_v2_new_init(const EVP_MD *hash_alg,
                                                               const X509 *signcert,
                                                               const
                                                               STACK_OF(X509) *certs,
                                                               int set_issuer_serial);
        int OSSL_ESS_check_signing_certs(const ESS_SIGNING_CERT *ss,
                                         const ESS_SIGNING_CERT_V2 *ssv2,
                                         const STACK_OF(X509) *chain,
                                         int require_signing_cert);

DESCRIPTION
       OSSL_ESS_signing_cert_new_init() generates a new ESS_SIGNING_CERT
       structure referencing the given signcert and any given further certs
       using their SHA-1 fingerprints.  If set_issuer_serial is nonzero then
       also the issuer and serial number of signcert are included in the
       ESS_CERT_ID as the issuerSerial field.  For all members of certs the
       issuerSerial field is always included.

       OSSL_ESS_signing_cert_v2_new_init() is the same as
       OSSL_ESS_signing_cert_new_init() except that it uses the given hash_alg
       and generates a ESS_SIGNING_CERT_V2 structure with ESS_CERT_ID_V2
       elements.

       OSSL_ESS_check_signing_certs() checks if the validation chain chain
       contains the certificates required by the identifiers given in ss
       and/or ssv2.  If require_signing_cert is nonzero, ss or ssv2 must not
       be NULL. If both ss and ssv2 are not NULL, they are evaluated
       independently.  The list of certificate identifiers in ss is of type
       ESS_CERT_ID, while the list contained in ssv2 is of type
       ESS_CERT_ID_V2.  As far as these lists are present, they must be
       nonempty.  The certificate identified by their first entry must be the
       first element of chain, i.e. the signer certificate.  Any further
       certificates referenced in the list must also be found in chain.  The
       matching is done using the given certificate hash algorithm and value.
       In addition to the checks required by RFCs 2624 and 5035, if the
       issuerSerial field is included in an ESSCertID or ESSCertIDv2 it must
       match the certificate issuer and serial number attributes.

NOTES
       ESS has been defined in RFC 2634, which has been updated in RFC 5035
       (ESS version 2) to support hash algorithms other than SHA-1. This is
       used for TSP (RFC 3161) and CAdES-BES (informational RFC 5126).

RETURN VALUES
       OSSL_ESS_signing_cert_new_init() and
       OSSL_ESS_signing_cert_v2_new_init() return a pointer to the new
       structure or NULL on malloc failure.

       OSSL_ESS_check_signing_certs() returns 1 on success, 0 if a required
       certificate cannot be found, -1 on other error.

SEE ALSO
       TS_VERIFY_CTX_set_certs(3), CMS_verify(3)

HISTORY
       OSSL_ESS_signing_cert_new_init(), OSSL_ESS_signing_cert_v2_new_init(),
       and OSSL_ESS_check_signing_certs() were added in OpenSSL 3.0.

COPYRIGHT
       Copyright 2021-2023 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>.



3.0.12                            2023-10-25   OSSL_ESS_check_signing_certs(3)