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tb_digest.c
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49  * This product includes cryptographic software written by Eric Young
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54 
55 #include "eng_int.h"
56 
57 /* If this symbol is defined then ENGINE_get_digest_engine(), the function that
58  * is used by EVP to hook in digest code and cache defaults (etc), will display
59  * brief debugging summaries to stderr with the 'nid'. */
60 /* #define ENGINE_DIGEST_DEBUG */
61 
62 static ENGINE_TABLE *digest_table = NULL;
63 
65  {
66  engine_table_unregister(&digest_table, e);
67  }
68 
69 static void engine_unregister_all_digests(void)
70  {
71  engine_table_cleanup(&digest_table);
72  }
73 
75  {
76  if(e->digests)
77  {
78  const int *nids;
79  int num_nids = e->digests(e, NULL, &nids, 0);
80  if(num_nids > 0)
81  return engine_table_register(&digest_table,
82  engine_unregister_all_digests, e, nids,
83  num_nids, 0);
84  }
85  return 1;
86  }
87 
89  {
90  ENGINE *e;
91 
92  for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
94  }
95 
97  {
98  if(e->digests)
99  {
100  const int *nids;
101  int num_nids = e->digests(e, NULL, &nids, 0);
102  if(num_nids > 0)
103  return engine_table_register(&digest_table,
104  engine_unregister_all_digests, e, nids,
105  num_nids, 1);
106  }
107  return 1;
108  }
109 
110 /* Exposed API function to get a functional reference from the implementation
111  * table (ie. try to get a functional reference from the tabled structural
112  * references) for a given digest 'nid' */
114  {
115  return engine_table_select(&digest_table, nid);
116  }
117 
118 /* Obtains a digest implementation from an ENGINE functional reference */
120  {
121  const EVP_MD *ret;
123  if(!fn || !fn(e, &ret, NULL, nid))
124  {
127  return NULL;
128  }
129  return ret;
130  }
131 
132 /* Gets the digest callback from an ENGINE structure */
134  {
135  return e->digests;
136  }
137 
138 /* Sets the digest callback in an ENGINE structure */
140  {
141  e->digests = f;
142  return 1;
143  }