NAME

       X509_LOOKUP_meth_new, X509_LOOKUP_meth_free, X509_LOOKUP_meth_set_new_item,
       X509_LOOKUP_meth_get_new_item, X509_LOOKUP_meth_set_free, X509_LOOKUP_meth_get_free,
       X509_LOOKUP_meth_set_init, X509_LOOKUP_meth_get_init, X509_LOOKUP_meth_set_shutdown,
       X509_LOOKUP_meth_get_shutdown, X509_LOOKUP_ctrl_fn, X509_LOOKUP_meth_set_ctrl,
       X509_LOOKUP_meth_get_ctrl, X509_LOOKUP_get_by_subject_fn,
       X509_LOOKUP_meth_set_get_by_subject, X509_LOOKUP_meth_get_get_by_subject,
       X509_LOOKUP_get_by_issuer_serial_fn, X509_LOOKUP_meth_set_get_by_issuer_serial,
       X509_LOOKUP_meth_get_get_by_issuer_serial, X509_LOOKUP_get_by_fingerprint_fn,
       X509_LOOKUP_meth_set_get_by_fingerprint, X509_LOOKUP_meth_get_get_by_fingerprint,
       X509_LOOKUP_get_by_alias_fn, X509_LOOKUP_meth_set_get_by_alias,
       X509_LOOKUP_meth_get_get_by_alias, X509_LOOKUP_set_method_data,
       X509_LOOKUP_get_method_data, X509_LOOKUP_get_store, X509_OBJECT_set1_X509,
       X509_OBJECT_set1_X509_CRL - Routines to build up X509_LOOKUP methods

SYNOPSIS

        #include <openssl/x509_vfy.h>

        X509_LOOKUP_METHOD *X509_LOOKUP_meth_new(const char *name);
        void X509_LOOKUP_meth_free(X509_LOOKUP_METHOD *method);

        int X509_LOOKUP_meth_set_new_item(X509_LOOKUP_METHOD *method,
                                          int (*new_item) (X509_LOOKUP *ctx));
        int (*X509_LOOKUP_meth_get_new_item(const X509_LOOKUP_METHOD* method))
            (X509_LOOKUP *ctx);

        int X509_LOOKUP_meth_set_free(X509_LOOKUP_METHOD *method,
                                      void (*free) (X509_LOOKUP *ctx));
        void (*X509_LOOKUP_meth_get_free(const X509_LOOKUP_METHOD* method))
            (X509_LOOKUP *ctx);

        int X509_LOOKUP_meth_set_init(X509_LOOKUP_METHOD *method,
                                      int (*init) (X509_LOOKUP *ctx));
        int (*X509_LOOKUP_meth_get_init(const X509_LOOKUP_METHOD* method))
            (X509_LOOKUP *ctx);

        int X509_LOOKUP_meth_set_shutdown(X509_LOOKUP_METHOD *method,
                                          int (*shutdown) (X509_LOOKUP *ctx));
        int (*X509_LOOKUP_meth_get_shutdown(const X509_LOOKUP_METHOD* method))
            (X509_LOOKUP *ctx);

        typedef int (*X509_LOOKUP_ctrl_fn)(X509_LOOKUP *ctx, int cmd, const char *argc,
                                           long argl, char **ret);
        int X509_LOOKUP_meth_set_ctrl(X509_LOOKUP_METHOD *method,
            X509_LOOKUP_ctrl_fn ctrl_fn);
        X509_LOOKUP_ctrl_fn X509_LOOKUP_meth_get_ctrl(const X509_LOOKUP_METHOD *method);

        typedef int (*X509_LOOKUP_get_by_subject_fn)(X509_LOOKUP *ctx,
                                                     X509_LOOKUP_TYPE type,
                                                     X509_NAME *name,
                                                     X509_OBJECT *ret);
        int X509_LOOKUP_meth_set_get_by_subject(X509_LOOKUP_METHOD *method,
            X509_LOOKUP_get_by_subject_fn fn);
        X509_LOOKUP_get_by_subject_fn X509_LOOKUP_meth_get_get_by_subject(
            const X509_LOOKUP_METHOD *method);

        typedef int (*X509_LOOKUP_get_by_issuer_serial_fn)(X509_LOOKUP *ctx,
                                                           X509_LOOKUP_TYPE type,
                                                           X509_NAME *name,
                                                           ASN1_INTEGER *serial,
                                                           X509_OBJECT *ret);
        int X509_LOOKUP_meth_set_get_by_issuer_serial(
            X509_LOOKUP_METHOD *method, X509_LOOKUP_get_by_issuer_serial_fn fn);
        X509_LOOKUP_get_by_issuer_serial_fn X509_LOOKUP_meth_get_get_by_issuer_serial(
            const X509_LOOKUP_METHOD *method);

        typedef int (*X509_LOOKUP_get_by_fingerprint_fn)(X509_LOOKUP *ctx,
                                                         X509_LOOKUP_TYPE type,
                                                         const unsigned char* bytes,
                                                         int len,
                                                         X509_OBJECT *ret);
        int X509_LOOKUP_meth_set_get_by_fingerprint(X509_LOOKUP_METHOD *method,
            X509_LOOKUP_get_by_fingerprint_fn fn);
        X509_LOOKUP_get_by_fingerprint_fn X509_LOOKUP_meth_get_get_by_fingerprint(
            const X509_LOOKUP_METHOD *method);

        typedef int (*X509_LOOKUP_get_by_alias_fn)(X509_LOOKUP *ctx,
                                                   X509_LOOKUP_TYPE type,
                                                   const char *str,
                                                   int len,
                                                   X509_OBJECT *ret);
        int X509_LOOKUP_meth_set_get_by_alias(X509_LOOKUP_METHOD *method,
            X509_LOOKUP_get_by_alias_fn fn);
        X509_LOOKUP_get_by_alias_fn X509_LOOKUP_meth_get_get_by_alias(
            const X509_LOOKUP_METHOD *method);

        int X509_LOOKUP_set_method_data(X509_LOOKUP *ctx, void *data);
        void *X509_LOOKUP_get_method_data(const X509_LOOKUP *ctx);

        X509_STORE *X509_LOOKUP_get_store(const X509_LOOKUP *ctx);

        int X509_OBJECT_set1_X509(X509_OBJECT *a, X509 *obj);
        int X509_OBJECT_set1_X509_CRL(X509_OBJECT *a, X509_CRL *obj);

DESCRIPTION

       The X509_LOOKUP_METHOD type is a structure used for the implementation of new X509_LOOKUP
       types. It provides a set of functions used by OpenSSL for the implementation of various
       X509 and X509_CRL lookup capabilities. One instance of an X509_LOOKUP_METHOD can be
       associated to many instantiations of an X509_LOOKUP structure.

       X509_LOOKUP_meth_new() creates a new X509_LOOKUP_METHOD structure. It should be given a
       human-readable string containing a brief description of the lookup method.

       X509_LOOKUP_meth_free() destroys a X509_LOOKUP_METHOD structure.

       X509_LOOKUP_get_new_item() and X509_LOOKUP_set_new_item() get and set the function that is
       called when an X509_LOOKUP object is created with X509_LOOKUP_new(). If an
       X509_LOOKUP_METHOD requires any per-X509_LOOKUP specific data, the supplied new_item
       function should allocate this data and invoke X509_LOOKUP_set_method_data().

       X509_LOOKUP_get_free() and X509_LOOKUP_set_free() get and set the function that is used to
       free any method data that was allocated and set from within new_item function.

       X509_LOOKUP_meth_get_init() and X509_LOOKUP_meth_set_init() get and set the function that
       is used to initialize the method data that was set with X509_LOOKUP_set_method_data() as
       part of the new_item routine.

       X509_LOOKUP_meth_get_shutdown() and X509_LOOKUP_meth_set_shutdown() get and set the
       function that is used to shut down the method data whose state was previously initialized
       in the init function.

       X509_LOOKUP_meth_get_ctrl() and X509_LOOKUP_meth_set_ctrl() get and set a function to be
       used to handle arbitrary control commands issued by X509_LOOKUP_ctrl(). The control
       function is given the X509_LOOKUP ctx, along with the arguments passed by
       X509_LOOKUP_ctrl. cmd is an arbitrary integer that defines some operation. argc is a
       pointer to an array of characters. argl is an integer. ret, if set, points to a location
       where any return data should be written to. How argc and argl are used depends entirely on
       the control function.

       X509_LOOKUP_set_get_by_subject(), X509_LOOKUP_set_get_by_issuer_serial(),
       X509_LOOKUP_set_get_by_fingerprint(), X509_LOOKUP_set_get_by_alias() set the functions
       used to retrieve an X509 or X509_CRL object by the object's subject, issuer, fingerprint,
       and alias respectively. These functions are given the X509_LOOKUP context, the type of the
       X509_OBJECT being requested, parameters related to the lookup, and an X509_OBJECT that
       will receive the requested object.

       Implementations should use either X509_OBJECT_set1_X509() or X509_OBJECT_set1_X509_CRL()
       to set the result. Any method data that was created as a result of the new_item function
       set by X509_LOOKUP_meth_set_new_item() can be accessed with X509_LOOKUP_get_method_data().
       The X509_STORE object that owns the X509_LOOKUP may be accessed with
       X509_LOOKUP_get_store(). Successful lookups should return 1, and unsuccessful lookups
       should return 0.

       X509_LOOKUP_get_get_by_subject(), X509_LOOKUP_get_get_by_issuer_serial(),
       X509_LOOKUP_get_get_by_fingerprint(), X509_LOOKUP_get_get_by_alias() retrieve the function
       set by the corresponding setter.

RETURN VALUES

       The X509_LOOKUP_meth_set functions return 1 on success or 0 on error.

       The X509_LOOKUP_meth_get functions return the corresponding function pointers.

SEE ALSO

       X509_STORE_new(3), SSL_CTX_set_cert_store(3)

HISTORY

       The functions described here were added in OpenSSL 1.1.0i.

COPYRIGHT

       Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (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>.