1 /*
2  * Copyright 1995-2021 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 
EVP_add_cipher(const EVP_CIPHER * c)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 
EVP_add_digest(const EVP_MD * md)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 
cipher_from_name(const char * name,void * data)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 
EVP_get_cipherbyname(const char * name)70 const EVP_CIPHER *EVP_get_cipherbyname(const char *name)
71 {
72     return evp_get_cipherbyname_ex(NULL, name);
73 }
74 
evp_get_cipherbyname_ex(OSSL_LIB_CTX * libctx,const char * name)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 
digest_from_name(const char * name,void * data)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 
EVP_get_digestbyname(const char * name)117 const EVP_MD *EVP_get_digestbyname(const char *name)
118 {
119     return evp_get_digestbyname_ex(NULL, name);
120 }
121 
evp_get_digestbyname_ex(OSSL_LIB_CTX * libctx,const char * name)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 
evp_cleanup_int(void)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 
do_all_cipher_fn(const OBJ_NAME * nm,void * arg)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 
EVP_CIPHER_do_all(void (* fn)(const EVP_CIPHER * ciph,const char * from,const char * to,void * x),void * arg)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 
EVP_CIPHER_do_all_sorted(void (* fn)(const EVP_CIPHER * ciph,const char * from,const char * to,void * x),void * arg)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 
do_all_md_fn(const OBJ_NAME * nm,void * arg)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 
EVP_MD_do_all(void (* fn)(const EVP_MD * md,const char * from,const char * to,void * x),void * arg)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 
EVP_MD_do_all_sorted(void (* fn)(const EVP_MD * md,const char * from,const char * to,void * x),void * arg)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 }
255