1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57 #include <openssl/digest.h>
58
59 #include <string.h>
60
61 #include <openssl/asn1.h>
62 #include <openssl/bytestring.h>
63 #include <openssl/nid.h>
64
65 #include "internal.h"
66 #include "../internal.h"
67
68
69 struct nid_to_digest {
70 int nid;
71 const EVP_MD* (*md_func)(void);
72 const char *short_name;
73 const char *long_name;
74 };
75
76 static const struct nid_to_digest nid_to_digest_mapping[] = {
77 {NID_md4, EVP_md4, SN_md4, LN_md4},
78 {NID_md5, EVP_md5, SN_md5, LN_md5},
79 {NID_sha1, EVP_sha1, SN_sha1, LN_sha1},
80 {NID_sha224, EVP_sha224, SN_sha224, LN_sha224},
81 {NID_sha256, EVP_sha256, SN_sha256, LN_sha256},
82 {NID_sha384, EVP_sha384, SN_sha384, LN_sha384},
83 {NID_sha512, EVP_sha512, SN_sha512, LN_sha512},
84 {NID_md5_sha1, EVP_md5_sha1, SN_md5_sha1, LN_md5_sha1},
85 /* As a remnant of signing |EVP_MD|s, OpenSSL returned the corresponding
86 * hash function when given a signature OID. To avoid unintended lax parsing
87 * of hash OIDs, this is no longer supported for lookup by OID or NID.
88 * Node.js, however, exposes |EVP_get_digestbyname|'s full behavior to
89 * consumers so we retain it there. */
90 {NID_undef, EVP_sha1, SN_dsaWithSHA, LN_dsaWithSHA},
91 {NID_undef, EVP_sha1, SN_dsaWithSHA1, LN_dsaWithSHA1},
92 {NID_undef, EVP_sha1, SN_ecdsa_with_SHA1, NULL},
93 {NID_undef, EVP_md5, SN_md5WithRSAEncryption, LN_md5WithRSAEncryption},
94 {NID_undef, EVP_sha1, SN_sha1WithRSAEncryption, LN_sha1WithRSAEncryption},
95 {NID_undef, EVP_sha224, SN_sha224WithRSAEncryption,
96 LN_sha224WithRSAEncryption},
97 {NID_undef, EVP_sha256, SN_sha256WithRSAEncryption,
98 LN_sha256WithRSAEncryption},
99 {NID_undef, EVP_sha384, SN_sha384WithRSAEncryption,
100 LN_sha384WithRSAEncryption},
101 {NID_undef, EVP_sha512, SN_sha512WithRSAEncryption,
102 LN_sha512WithRSAEncryption},
103 };
104
EVP_get_digestbynid(int nid)105 const EVP_MD* EVP_get_digestbynid(int nid) {
106 if (nid == NID_undef) {
107 /* Skip the |NID_undef| entries in |nid_to_digest_mapping|. */
108 return NULL;
109 }
110
111 for (unsigned i = 0; i < OPENSSL_ARRAY_SIZE(nid_to_digest_mapping); i++) {
112 if (nid_to_digest_mapping[i].nid == nid) {
113 return nid_to_digest_mapping[i].md_func();
114 }
115 }
116
117 return NULL;
118 }
119
120 static const struct {
121 uint8_t oid[9];
122 uint8_t oid_len;
123 const EVP_MD *(*md_func) (void);
124 } kMDOIDs[] = {
125 /* 1.2.840.113549.2.4 */
126 { {0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x04}, 8, EVP_md4 },
127 /* 1.2.840.113549.2.5 */
128 { {0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05}, 8, EVP_md5 },
129 /* 1.3.14.3.2.26 */
130 { {0x2b, 0x0e, 0x03, 0x02, 0x1a}, 5, EVP_sha1 },
131 /* 2.16.840.1.101.3.4.2.1 */
132 { {0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01}, 9, EVP_sha256 },
133 /* 2.16.840.1.101.3.4.2.2 */
134 { {0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02}, 9, EVP_sha384 },
135 /* 2.16.840.1.101.3.4.2.3 */
136 { {0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03}, 9, EVP_sha512 },
137 /* 2.16.840.1.101.3.4.2.4 */
138 { {0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04}, 9, EVP_sha224 },
139 };
140
cbs_to_md(const CBS * cbs)141 static const EVP_MD *cbs_to_md(const CBS *cbs) {
142 for (size_t i = 0; i < OPENSSL_ARRAY_SIZE(kMDOIDs); i++) {
143 if (CBS_len(cbs) == kMDOIDs[i].oid_len &&
144 OPENSSL_memcmp(CBS_data(cbs), kMDOIDs[i].oid, kMDOIDs[i].oid_len) ==
145 0) {
146 return kMDOIDs[i].md_func();
147 }
148 }
149
150 return NULL;
151 }
152
EVP_get_digestbyobj(const ASN1_OBJECT * obj)153 const EVP_MD *EVP_get_digestbyobj(const ASN1_OBJECT *obj) {
154 /* Handle objects with no corresponding OID. */
155 if (obj->nid != NID_undef) {
156 return EVP_get_digestbynid(obj->nid);
157 }
158
159 CBS cbs;
160 CBS_init(&cbs, obj->data, obj->length);
161 return cbs_to_md(&cbs);
162 }
163
EVP_parse_digest_algorithm(CBS * cbs)164 const EVP_MD *EVP_parse_digest_algorithm(CBS *cbs) {
165 CBS algorithm, oid;
166 if (!CBS_get_asn1(cbs, &algorithm, CBS_ASN1_SEQUENCE) ||
167 !CBS_get_asn1(&algorithm, &oid, CBS_ASN1_OBJECT)) {
168 OPENSSL_PUT_ERROR(DIGEST, DIGEST_R_DECODE_ERROR);
169 return NULL;
170 }
171
172 const EVP_MD *ret = cbs_to_md(&oid);
173 if (ret == NULL) {
174 OPENSSL_PUT_ERROR(DIGEST, DIGEST_R_UNKNOWN_HASH);
175 return NULL;
176 }
177
178 /* The parameters, if present, must be NULL. Historically, whether the NULL
179 * was included or omitted was not well-specified. When parsing an
180 * AlgorithmIdentifier, we allow both. (Note this code is not used when
181 * verifying RSASSA-PKCS1-v1_5 signatures.) */
182 if (CBS_len(&algorithm) > 0) {
183 CBS param;
184 if (!CBS_get_asn1(&algorithm, ¶m, CBS_ASN1_NULL) ||
185 CBS_len(¶m) != 0 ||
186 CBS_len(&algorithm) != 0) {
187 OPENSSL_PUT_ERROR(DIGEST, DIGEST_R_DECODE_ERROR);
188 return NULL;
189 }
190 }
191
192 return ret;
193 }
194
EVP_get_digestbyname(const char * name)195 const EVP_MD *EVP_get_digestbyname(const char *name) {
196 for (unsigned i = 0; i < OPENSSL_ARRAY_SIZE(nid_to_digest_mapping); i++) {
197 const char *short_name = nid_to_digest_mapping[i].short_name;
198 const char *long_name = nid_to_digest_mapping[i].long_name;
199 if ((short_name && strcmp(short_name, name) == 0) ||
200 (long_name && strcmp(long_name, name) == 0)) {
201 return nid_to_digest_mapping[i].md_func();
202 }
203 }
204
205 return NULL;
206 }
207