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ENGINE_ADD(3)         DragonFly Library Functions Manual         ENGINE_ADD(3)

NAME
     ENGINE_add, ENGINE_set_id, ENGINE_get_id, ENGINE_set_name,
     ENGINE_get_name, ENGINE_remove, ENGINE_cleanup, ENGINE_get_first,
     ENGINE_get_last, ENGINE_get_next, ENGINE_get_prev, ENGINE_by_id -
     maintain a global list of ENGINE objects

SYNOPSIS
     #include <openssl/engine.h>

     int
     ENGINE_add(ENGINE *e);

     int
     ENGINE_set_id(ENGINE *e, const char *id);

     const char *
     ENGINE_get_id(const ENGINE *e);

     int
     ENGINE_set_name(ENGINE *e, const char *name);

     const char *
     ENGINE_get_name(const ENGINE *e);

     int
     ENGINE_remove(ENGINE *e);

     void
     ENGINE_cleanup(void);

     ENGINE *
     ENGINE_get_first(void);

     ENGINE *
     ENGINE_get_last(void);

     ENGINE *
     ENGINE_get_next(ENGINE *e);

     ENGINE *
     ENGINE_get_prev(ENGINE *e);

     ENGINE *
     ENGINE_by_id(const char *id);

DESCRIPTION
     The crypto library maintains a global list of ENGINE objects.

     ENGINE_add() appends e to the end of the list and increments its
     structural reference count by 1.  A unique identifier and a name of e
     have to be set with ENGINE_set_id() and ENGINE_set_name() before calling
     this function.  ENGINE_add() fails if the list already contains an ENGINE
     with the same identifier.

     ENGINE_remove() removes e from the list.  If successful, it calls
     ENGINE_free(3) on e.

     ENGINE_cleanup() calls ENGINE_finish(3) on all ENGINE objects that were
     selected as default engines, for example using the functions documented
     in the ENGINE_set_default(3) and ENGINE_get_default_RSA(3) manual pages,
     and it calls ENGINE_remove() on all ENGINE objects that were added to the
     global list with ENGINE_add().  Calling this function is required at the
     end of each program using ENGINE_add(), even if no engines are explicitly
     registered or used.

     ENGINE_get_first() and ENGINE_get_last() provide access to the first and
     last ENGINE object on the list, respectively.  Unless the list is empty,
     they increment the structural reference count of the retrieved object by
     1.

     ENGINE_get_next() and ENGINE_get_prev() support iteration of the list.
     They always call ENGINE_free(3) on e.  Unless the end of the list is
     reached, they increment the structural reference count of the retrieved
     object by 1.

     ENGINE_by_id() searches the list for an ENGINE object with a matching id.
     If found, it increments the structural reference count of the retrieved
     object by 1.  If ENGINE_FLAGS_BY_ID_COPY was set on e with
     ENGINE_set_flags(3), it returns a shallow copy of the object rather than
     incrementing the reference count and returning a pointer to the original.

RETURN VALUES
     ENGINE_add(), ENGINE_set_id(), ENGINE_set_name(), and ENGINE_remove()
     return 1 on success or 0 on error.  ENGINE_set_id() and ENGINE_set_name()
     can only fail if the supplied id or name is NULL.

     ENGINE_get_id() and ENGINE_get_name() return a pointer to an internal
     string representing the identifier and the name of e, respectively.

     ENGINE_get_first() and ENGINE_get_last() return an ENGINE object or NULL
     if the list is empty.

     ENGINE_get_next() and ENGINE_get_prev() return an ENGINE object or NULL
     when the end of the list is reached.

     ENGINE_by_id() returns an ENGINE object or NULL if no matching object is
     found.

SEE ALSO
     ENGINE_get_default_RSA(3), ENGINE_init(3), ENGINE_new(3),
     ENGINE_register_all_RSA(3), ENGINE_register_RSA(3),
     ENGINE_set_default(3), ENGINE_set_flags(3), ENGINE_unregister_RSA(3)

HISTORY
     ENGINE_add(), ENGINE_set_id(), ENGINE_get_id(), ENGINE_set_name(),
     ENGINE_get_name(), ENGINE_remove(), ENGINE_get_first(),
     ENGINE_get_last(), ENGINE_get_next(), ENGINE_get_prev(), and
     ENGINE_by_id() first appeared in OpenSSL 0.9.7 and have been available
     since OpenBSD 2.9.

     ENGINE_cleanup() first appeared in OpenSSL 0.9.7 and has been available
     since OpenBSD 3.2.

DragonFly 5.9-DEVELOPMENT       April 18, 2018       DragonFly 5.9-DEVELOPMENT