tb_dh.c

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#include "eng_int.h"

/* If this symbol is defined then ENGINE_get_default_DH(), the function that is
 * used by DH to hook in implementation code and cache defaults (etc), will
 * display brief debugging summaries to stderr with the 'nid'. */
/* #define ENGINE_DH_DEBUG */

static ENGINE_TABLE *dh_table = NULL;
static const int dummy_nid = 1;

void ENGINE_unregister_DH(ENGINE *e)
    {
    engine_table_unregister(&dh_table, e);
    }

static void engine_unregister_all_DH(void)
    {
    engine_table_cleanup(&dh_table);
    }

int ENGINE_register_DH(ENGINE *e)
    {
    if(e->dh_meth)
        return engine_table_register(&dh_table,
                engine_unregister_all_DH, e, &dummy_nid, 1, 0);
    return 1;
    }

void ENGINE_register_all_DH()
    {
    ENGINE *e;

    for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
        ENGINE_register_DH(e);
    }

int ENGINE_set_default_DH(ENGINE *e)
    {
    if(e->dh_meth)
        return engine_table_register(&dh_table,
                engine_unregister_all_DH, e, &dummy_nid, 1, 1);
    return 1;
    }

/* Exposed API function to get a functional reference from the implementation
 * table (ie. try to get a functional reference from the tabled structural
 * references). */
ENGINE *ENGINE_get_default_DH(void)
    {
    return engine_table_select(&dh_table, dummy_nid);
    }

/* Obtains an DH implementation from an ENGINE functional reference */
const DH_METHOD *ENGINE_get_DH(const ENGINE *e)
    {
    return e->dh_meth;
    }

/* Sets an DH implementation in an ENGINE structure */
int ENGINE_set_DH(ENGINE *e, const DH_METHOD *dh_meth)
    {
    e->dh_meth = dh_meth;
    return 1;
    }