tb_pkmeth.c

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/* ====================================================================
 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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 *    [email protected].
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 *    "This product includes software developed by the OpenSSL Project
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 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * ([email protected]).  This product includes software written by Tim
 * Hudson ([email protected]).
 *
 */

#include "eng_int.h"
#include <openssl/evp.h>

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

static ENGINE_TABLE *pkey_meth_table = NULL;

void ENGINE_unregister_pkey_meths(ENGINE *e)
    {
    engine_table_unregister(&pkey_meth_table, e);
    }

static void engine_unregister_all_pkey_meths(void)
    {
    engine_table_cleanup(&pkey_meth_table);
    }

int ENGINE_register_pkey_meths(ENGINE *e)
    {
    if(e->pkey_meths)
        {
        const int *nids;
        int num_nids = e->pkey_meths(e, NULL, &nids, 0);
        if(num_nids > 0)
            return engine_table_register(&pkey_meth_table,
                engine_unregister_all_pkey_meths, e, nids,
                    num_nids, 0);
        }
    return 1;
    }

void ENGINE_register_all_pkey_meths()
    {
    ENGINE *e;

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

int ENGINE_set_default_pkey_meths(ENGINE *e)
    {
    if(e->pkey_meths)
        {
        const int *nids;
        int num_nids = e->pkey_meths(e, NULL, &nids, 0);
        if(num_nids > 0)
            return engine_table_register(&pkey_meth_table,
                engine_unregister_all_pkey_meths, e, nids,
                    num_nids, 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) for a given pkey_meth 'nid' */
ENGINE *ENGINE_get_pkey_meth_engine(int nid)
    {
    return engine_table_select(&pkey_meth_table, nid);
    }

/* Obtains a pkey_meth implementation from an ENGINE functional reference */
const EVP_PKEY_METHOD *ENGINE_get_pkey_meth(ENGINE *e, int nid)
    {
    EVP_PKEY_METHOD *ret;
    ENGINE_PKEY_METHS_PTR fn = ENGINE_get_pkey_meths(e);
    if(!fn || !fn(e, &ret, NULL, nid))
        {
        ENGINEerr(ENGINE_F_ENGINE_GET_PKEY_METH,
                ENGINE_R_UNIMPLEMENTED_PUBLIC_KEY_METHOD);
        return NULL;
        }
    return ret;
    }

/* Gets the pkey_meth callback from an ENGINE structure */
ENGINE_PKEY_METHS_PTR ENGINE_get_pkey_meths(const ENGINE *e)
    {
    return e->pkey_meths;
    }

/* Sets the pkey_meth callback in an ENGINE structure */
int ENGINE_set_pkey_meths(ENGINE *e, ENGINE_PKEY_METHS_PTR f)
    {
    e->pkey_meths = f;
    return 1;
    }

/* Internal function to free up EVP_PKEY_METHOD structures before an
 * ENGINE is destroyed
 */

void engine_pkey_meths_free(ENGINE *e)
    {
    int i;
    EVP_PKEY_METHOD *pkm;
    if (e->pkey_meths)
        {
        const int *pknids;
        int npknids;
        npknids = e->pkey_meths(e, NULL, &pknids, 0);
        for (i = 0; i < npknids; i++)
            {
            if (e->pkey_meths(e, &pkm, NULL, pknids[i]))
                {
                EVP_PKEY_meth_free(pkm);
                }
            }
        }
    }