tb_digest.c
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/*
* Copyright 2001-2018 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
*/
#include "eng_int.h"
static ENGINE_TABLE *digest_table = NULL;
void ENGINE_unregister_digests(ENGINE *e)
{
engine_table_unregister(&digest_table, e);
}
static void engine_unregister_all_digests(void)
{
engine_table_cleanup(&digest_table);
}
int ENGINE_register_digests(ENGINE *e)
{
if (e->digests) {
const int *nids;
int num_nids = e->digests(e, NULL, &nids, 0);
if (num_nids > 0)
return engine_table_register(&digest_table,
engine_unregister_all_digests, e,
nids, num_nids, 0);
}
return 1;
}
void ENGINE_register_all_digests(void)
{
ENGINE *e;
for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
ENGINE_register_digests(e);
}
int ENGINE_set_default_digests(ENGINE *e)
{
if (e->digests) {
const int *nids;
int num_nids = e->digests(e, NULL, &nids, 0);
if (num_nids > 0)
return engine_table_register(&digest_table,
engine_unregister_all_digests, 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 digest 'nid'
*/
ENGINE *ENGINE_get_digest_engine(int nid)
{
return engine_table_select(&digest_table, nid);
}
/* Obtains a digest implementation from an ENGINE functional reference */
const EVP_MD *ENGINE_get_digest(ENGINE *e, int nid)
{
const EVP_MD *ret;
ENGINE_DIGESTS_PTR fn = ENGINE_get_digests(e);
if (!fn || !fn(e, &ret, NULL, nid)) {
ENGINEerr(ENGINE_F_ENGINE_GET_DIGEST, ENGINE_R_UNIMPLEMENTED_DIGEST);
return NULL;
}
return ret;
}
/* Gets the digest callback from an ENGINE structure */
ENGINE_DIGESTS_PTR ENGINE_get_digests(const ENGINE *e)
{
return e->digests;
}
/* Sets the digest callback in an ENGINE structure */
int ENGINE_set_digests(ENGINE *e, ENGINE_DIGESTS_PTR f)
{
e->digests = f;
return 1;
}