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