crypto/evp/names.c

   1 /*
   2  * Copyright 1995-2020 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(OSSL_LIB_CTX *libctx,
  76                                           const char *name)
  77 {
  78     const EVP_CIPHER *cp;
  79     OSSL_NAMEMAP *namemap;
  80     int id;
  81
  82     if (!OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS, NULL))
  83         return NULL;
  84
  85     cp = (const EVP_CIPHER *)OBJ_NAME_get(name, OBJ_NAME_TYPE_CIPHER_METH);
  86
  87     if (cp != NULL)
  88         return cp;
  89
  90     /*
  91      * It's not in the method database, but it might be there under a different
  92      * name. So we check for aliases in the EVP namemap and try all of those
  93      * in turn.
  94      */
  95
  96     namemap = ossl_namemap_stored(libctx);
  97     id = ossl_namemap_name2num(namemap, name);
  98     if (id == 0)
  99         return NULL;
 100
 101     if (!ossl_namemap_doall_names(namemap, id, cipher_from_name, &cp))
 102         return NULL;
 103
 104     return cp;
 105 }
 106
 107 static void digest_from_name(const char *name, void *data)
 108 {
 109     const EVP_MD **md = data;
 110
 111     if (*md != NULL)
 112         return;
 113
 114     *md = (const EVP_MD *)OBJ_NAME_get(name, OBJ_NAME_TYPE_MD_METH);
 115 }
 116
 117 const EVP_MD *EVP_get_digestbyname(const char *name)
 118 {
 119     return evp_get_digestbyname_ex(NULL, name);
 120 }
 121
 122 const EVP_MD *evp_get_digestbyname_ex(OSSL_LIB_CTX *libctx, const char *name)
 123 {
 124     const EVP_MD *dp;
 125     OSSL_NAMEMAP *namemap;
 126     int id;
 127
 128     if (!OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_DIGESTS, NULL))
 129         return NULL;
 130
 131     dp = (const EVP_MD *)OBJ_NAME_get(name, OBJ_NAME_TYPE_MD_METH);
 132
 133     if (dp != NULL)
 134         return dp;
 135
 136     /*
 137      * It's not in the method database, but it might be there under a different
 138      * name. So we check for aliases in the EVP namemap and try all of those
 139      * in turn.
 140      */
 141
 142     namemap = ossl_namemap_stored(libctx);
 143     id = ossl_namemap_name2num(namemap, name);
 144     if (id == 0)
 145         return NULL;
 146
 147     if (!ossl_namemap_doall_names(namemap, id, digest_from_name, &dp))
 148         return NULL;
 149
 150     return dp;
 151 }
 152
 153 void evp_cleanup_int(void)
 154 {
 155     OBJ_NAME_cleanup(OBJ_NAME_TYPE_KDF_METH);
 156     OBJ_NAME_cleanup(OBJ_NAME_TYPE_CIPHER_METH);
 157     OBJ_NAME_cleanup(OBJ_NAME_TYPE_MD_METH);
 158     /*
 159      * The above calls will only clean out the contents of the name hash
 160      * table, but not the hash table itself.  The following line does that
 161      * part.  -- Richard Levitte
 162      */
 163     OBJ_NAME_cleanup(-1);
 164
 165     EVP_PBE_cleanup();
 166     OBJ_sigid_free();
 167
 168     evp_app_cleanup_int();
 169 }
 170
 171 struct doall_cipher {
 172     void *arg;
 173     void (*fn) (const EVP_CIPHER *ciph,
 174                 const char *from, const char *to, void *arg);
 175 };
 176
 177 static void do_all_cipher_fn(const OBJ_NAME *nm, void *arg)
 178 {
 179     struct doall_cipher *dc = arg;
 180     if (nm->alias)
 181         dc->fn(NULL, nm->name, nm->data, dc->arg);
 182     else
 183         dc->fn((const EVP_CIPHER *)nm->data, nm->name, NULL, dc->arg);
 184 }
 185
 186 void EVP_CIPHER_do_all(void (*fn) (const EVP_CIPHER *ciph,
 187                                    const char *from, const char *to, void *x),
 188                        void *arg)
 189 {
 190     struct doall_cipher dc;
 191
 192     /* Ignore errors */
 193     OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS, NULL);
 194
 195     dc.fn = fn;
 196     dc.arg = arg;
 197     OBJ_NAME_do_all(OBJ_NAME_TYPE_CIPHER_METH, do_all_cipher_fn, &dc);
 198 }
 199
 200 void EVP_CIPHER_do_all_sorted(void (*fn) (const EVP_CIPHER *ciph,
 201                                           const char *from, const char *to,
 202                                           void *x), void *arg)
 203 {
 204     struct doall_cipher dc;
 205
 206     /* Ignore errors */
 207     OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS, NULL);
 208
 209     dc.fn = fn;
 210     dc.arg = arg;
 211     OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH, do_all_cipher_fn, &dc);
 212 }
 213
 214 struct doall_md {
 215     void *arg;
 216     void (*fn) (const EVP_MD *ciph,
 217                 const char *from, const char *to, void *arg);
 218 };
 219
 220 static void do_all_md_fn(const OBJ_NAME *nm, void *arg)
 221 {
 222     struct doall_md *dc = arg;
 223     if (nm->alias)
 224         dc->fn(NULL, nm->name, nm->data, dc->arg);
 225     else
 226         dc->fn((const EVP_MD *)nm->data, nm->name, NULL, dc->arg);
 227 }
 228
 229 void EVP_MD_do_all(void (*fn) (const EVP_MD *md,
 230                                const char *from, const char *to, void *x),
 231                    void *arg)
 232 {
 233     struct doall_md dc;
 234
 235     /* Ignore errors */
 236     OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);
 237
 238     dc.fn = fn;
 239     dc.arg = arg;
 240     OBJ_NAME_do_all(OBJ_NAME_TYPE_MD_METH, do_all_md_fn, &dc);
 241 }
 242
 243 void EVP_MD_do_all_sorted(void (*fn) (const EVP_MD *md,
 244                                       const char *from, const char *to,
 245                                       void *x), void *arg)
 246 {
 247     struct doall_md dc;
 248
 249     OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);
 250
 251     dc.fn = fn;
 252     dc.arg = arg;
 253     OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_MD_METH, do_all_md_fn, &dc);
 254 }