crypto/evp/names.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 <stdio.h>
  11 #include <openssl/evp.h>
  12 #include <openssl/kdf.h>
  13 #include <openssl/x509.h>
  14 #include "internal/cryptlib.h"
  15 #include "internal/namemap.h"
  16 #include "crypto/objects.h"
  17 #include "crypto/evp.h"
  18
  19 int EVP_add_cipher(const EVP_CIPHER *c)
  20 {
  21     int r;
  22
  23     if (c == NULL)
  24         return 0;
  25
  26     r = OBJ_NAME_add(OBJ_nid2sn(c->nid), OBJ_NAME_TYPE_CIPHER_METH,
  27                      (const char *)c);
  28     if (r == 0)
  29         return 0;
  30     r = OBJ_NAME_add(OBJ_nid2ln(c->nid), OBJ_NAME_TYPE_CIPHER_METH,
  31                      (const char *)c);
  32     return r;
  33 }
  34
  35 int EVP_add_digest(const EVP_MD *md)
  36 {
  37     int r;
  38     const char *name;
  39
  40     name = OBJ_nid2sn(md->type);
  41     r = OBJ_NAME_add(name, OBJ_NAME_TYPE_MD_METH, (const char *)md);
  42     if (r == 0)
  43         return 0;
  44     r = OBJ_NAME_add(OBJ_nid2ln(md->type), OBJ_NAME_TYPE_MD_METH,
  45                      (const char *)md);
  46     if (r == 0)
  47         return 0;
  48
  49     if (md->pkey_type && md->type != md->pkey_type) {
  50         r = OBJ_NAME_add(OBJ_nid2sn(md->pkey_type),
  51                          OBJ_NAME_TYPE_MD_METH | OBJ_NAME_ALIAS, name);
  52         if (r == 0)
  53             return 0;
  54         r = OBJ_NAME_add(OBJ_nid2ln(md->pkey_type),
  55                          OBJ_NAME_TYPE_MD_METH | OBJ_NAME_ALIAS, name);
  56     }
  57     return r;
  58 }
  59
  60 static void cipher_from_name(const char *name, void *data)
  61 {
  62     const EVP_CIPHER **cipher = data;
  63
  64     if (*cipher != NULL)
  65         return;
  66
  67     *cipher = (const EVP_CIPHER *)OBJ_NAME_get(name, OBJ_NAME_TYPE_CIPHER_METH);
  68 }
  69
  70 const EVP_CIPHER *EVP_get_cipherbyname(const char *name)
  71 {
  72     return evp_get_cipherbyname_ex(NULL, name);
  73 }
  74
  75 const EVP_CIPHER *evp_get_cipherbyname_ex(OPENSSL_CTX *libctx, const char *name)
  76 {
  77     const EVP_CIPHER *cp;
  78     OSSL_NAMEMAP *namemap;
  79     int id;
  80
  81     if (!OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS, NULL))
  82         return NULL;
  83
  84     cp = (const EVP_CIPHER *)OBJ_NAME_get(name, OBJ_NAME_TYPE_CIPHER_METH);
  85
  86     if (cp != NULL)
  87         return cp;
  88
  89     /*
  90      * It's not in the method database, but it might be there under a different
  91      * name. So we check for aliases in the EVP namemap and try all of those
  92      * in turn.
  93      */
  94
  95     namemap = ossl_namemap_stored(libctx);
  96     id = ossl_namemap_name2num(namemap, name);
  97     if (id == 0)
  98         return NULL;
  99
 100     ossl_namemap_doall_names(namemap, id, cipher_from_name, &cp);
 101
 102     return cp;
 103 }
 104
 105 static void digest_from_name(const char *name, void *data)
 106 {
 107     const EVP_MD **md = data;
 108
 109     if (*md != NULL)
 110         return;
 111
 112     *md = (const EVP_MD *)OBJ_NAME_get(name, OBJ_NAME_TYPE_MD_METH);
 113 }
 114
 115 const EVP_MD *EVP_get_digestbyname(const char *name)
 116 {
 117     return evp_get_digestbyname_ex(NULL, name);
 118 }
 119
 120 const EVP_MD *evp_get_digestbyname_ex(OPENSSL_CTX *libctx, const char *name)
 121 {
 122     const EVP_MD *dp;
 123     OSSL_NAMEMAP *namemap;
 124     int id;
 125
 126     if (!OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_DIGESTS, NULL))
 127         return NULL;
 128
 129     dp = (const EVP_MD *)OBJ_NAME_get(name, OBJ_NAME_TYPE_MD_METH);
 130
 131     if (dp != NULL)
 132         return dp;
 133
 134     /*
 135      * It's not in the method database, but it might be there under a different
 136      * name. So we check for aliases in the EVP namemap and try all of those
 137      * in turn.
 138      */
 139
 140     namemap = ossl_namemap_stored(libctx);
 141     id = ossl_namemap_name2num(namemap, name);
 142     if (id == 0)
 143         return NULL;
 144
 145     ossl_namemap_doall_names(namemap, id, digest_from_name, &dp);
 146
 147     return dp;
 148 }
 149
 150 void evp_cleanup_int(void)
 151 {
 152     OBJ_NAME_cleanup(OBJ_NAME_TYPE_KDF_METH);
 153     OBJ_NAME_cleanup(OBJ_NAME_TYPE_CIPHER_METH);
 154     OBJ_NAME_cleanup(OBJ_NAME_TYPE_MD_METH);
 155     /*
 156      * The above calls will only clean out the contents of the name hash
 157      * table, but not the hash table itself.  The following line does that
 158      * part.  -- Richard Levitte
 159      */
 160     OBJ_NAME_cleanup(-1);
 161
 162     EVP_PBE_cleanup();
 163     OBJ_sigid_free();
 164
 165     evp_app_cleanup_int();
 166 }
 167
 168 struct doall_cipher {
 169     void *arg;
 170     void (*fn) (const EVP_CIPHER *ciph,
 171                 const char *from, const char *to, void *arg);
 172 };
 173
 174 static void do_all_cipher_fn(const OBJ_NAME *nm, void *arg)
 175 {
 176     struct doall_cipher *dc = arg;
 177     if (nm->alias)
 178         dc->fn(NULL, nm->name, nm->data, dc->arg);
 179     else
 180         dc->fn((const EVP_CIPHER *)nm->data, nm->name, NULL, dc->arg);
 181 }
 182
 183 void EVP_CIPHER_do_all(void (*fn) (const EVP_CIPHER *ciph,
 184                                    const char *from, const char *to, void *x),
 185                        void *arg)
 186 {
 187     struct doall_cipher dc;
 188
 189     /* Ignore errors */
 190     OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS, NULL);
 191
 192     dc.fn = fn;
 193     dc.arg = arg;
 194     OBJ_NAME_do_all(OBJ_NAME_TYPE_CIPHER_METH, do_all_cipher_fn, &dc);
 195 }
 196
 197 void EVP_CIPHER_do_all_sorted(void (*fn) (const EVP_CIPHER *ciph,
 198                                           const char *from, const char *to,
 199                                           void *x), void *arg)
 200 {
 201     struct doall_cipher dc;
 202
 203     /* Ignore errors */
 204     OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS, NULL);
 205
 206     dc.fn = fn;
 207     dc.arg = arg;
 208     OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH, do_all_cipher_fn, &dc);
 209 }
 210
 211 struct doall_md {
 212     void *arg;
 213     void (*fn) (const EVP_MD *ciph,
 214                 const char *from, const char *to, void *arg);
 215 };
 216
 217 static void do_all_md_fn(const OBJ_NAME *nm, void *arg)
 218 {
 219     struct doall_md *dc = arg;
 220     if (nm->alias)
 221         dc->fn(NULL, nm->name, nm->data, dc->arg);
 222     else
 223         dc->fn((const EVP_MD *)nm->data, nm->name, NULL, dc->arg);
 224 }
 225
 226 void EVP_MD_do_all(void (*fn) (const EVP_MD *md,
 227                                const char *from, const char *to, void *x),
 228                    void *arg)
 229 {
 230     struct doall_md dc;
 231
 232     /* Ignore errors */
 233     OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);
 234
 235     dc.fn = fn;
 236     dc.arg = arg;
 237     OBJ_NAME_do_all(OBJ_NAME_TYPE_MD_METH, do_all_md_fn, &dc);
 238 }
 239
 240 void EVP_MD_do_all_sorted(void (*fn) (const EVP_MD *md,
 241                                       const char *from, const char *to,
 242                                       void *x), void *arg)
 243 {
 244     struct doall_md dc;
 245
 246     OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);
 247
 248     dc.fn = fn;
 249     dc.arg = arg;
 250     OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_MD_METH, do_all_md_fn, &dc);
 251 }