1 /* 2 * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include "eng_int.h" 11 12 static ENGINE_TABLE *digest_table = NULL; 13 14 void ENGINE_unregister_digests(ENGINE *e) 15 { 16 engine_table_unregister(&digest_table, e); 17 } 18 19 static void engine_unregister_all_digests(void) 20 { 21 engine_table_cleanup(&digest_table); 22 } 23 24 int ENGINE_register_digests(ENGINE *e) 25 { 26 if (e->digests) { 27 const int *nids; 28 int num_nids = e->digests(e, NULL, &nids, 0); 29 if (num_nids > 0) 30 return engine_table_register(&digest_table, 31 engine_unregister_all_digests, e, 32 nids, num_nids, 0); 33 } 34 return 1; 35 } 36 37 void ENGINE_register_all_digests(void) 38 { 39 ENGINE *e; 40 41 for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e)) 42 ENGINE_register_digests(e); 43 } 44 45 int ENGINE_set_default_digests(ENGINE *e) 46 { 47 if (e->digests) { 48 const int *nids; 49 int num_nids = e->digests(e, NULL, &nids, 0); 50 if (num_nids > 0) 51 return engine_table_register(&digest_table, 52 engine_unregister_all_digests, e, 53 nids, num_nids, 1); 54 } 55 return 1; 56 } 57 58 /* 59 * Exposed API function to get a functional reference from the implementation 60 * table (ie. try to get a functional reference from the tabled structural 61 * references) for a given digest 'nid' 62 */ 63 ENGINE *ENGINE_get_digest_engine(int nid) 64 { 65 return engine_table_select(&digest_table, nid); 66 } 67 68 /* Obtains a digest implementation from an ENGINE functional reference */ 69 const EVP_MD *ENGINE_get_digest(ENGINE *e, int nid) 70 { 71 const EVP_MD *ret; 72 ENGINE_DIGESTS_PTR fn = ENGINE_get_digests(e); 73 if (!fn || !fn(e, &ret, NULL, nid)) { 74 ENGINEerr(ENGINE_F_ENGINE_GET_DIGEST, ENGINE_R_UNIMPLEMENTED_DIGEST); 75 return NULL; 76 } 77 return ret; 78 } 79 80 /* Gets the digest callback from an ENGINE structure */ 81 ENGINE_DIGESTS_PTR ENGINE_get_digests(const ENGINE *e) 82 { 83 return e->digests; 84 } 85 86 /* Sets the digest callback in an ENGINE structure */ 87 int ENGINE_set_digests(ENGINE *e, ENGINE_DIGESTS_PTR f) 88 { 89 e->digests = f; 90 return 1; 91 } 92