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
67
68 struct nid_to_digest {
69 int nid;
70 const EVP_MD* (*md_func)(void);
71 const char *short_name;
72 const char *long_name;
73 };
74
75 static const struct nid_to_digest nid_to_digest_mapping[] = {
76 {NID_md4, EVP_md4, SN_md4, LN_md4},
77 {NID_md5, EVP_md5, SN_md5, LN_md5},
78 {NID_sha1, EVP_sha1, SN_sha1, LN_sha1},
79 {NID_sha224, EVP_sha224, SN_sha224, LN_sha224},
80 {NID_sha256, EVP_sha256, SN_sha256, LN_sha256},
81 {NID_sha384, EVP_sha384, SN_sha384, LN_sha384},
82 {NID_sha512, EVP_sha512, SN_sha512, LN_sha512},
83 {NID_md5_sha1, EVP_md5_sha1, SN_md5_sha1, LN_md5_sha1},
84 // As a remnant of signing |EVP_MD|s, OpenSSL returned the corresponding
85 // hash function when given a signature OID. To avoid unintended lax parsing
86 // of hash OIDs, this is no longer supported for lookup by OID or NID.
87 // Node.js, however, exposes |EVP_get_digestbyname|'s full behavior to
88 // consumers so we retain it there.
89 {NID_undef, EVP_sha1, SN_dsaWithSHA, LN_dsaWithSHA},
90 {NID_undef, EVP_sha1, SN_dsaWithSHA1, LN_dsaWithSHA1},
91 {NID_undef, EVP_sha1, SN_ecdsa_with_SHA1, NULL},
92 {NID_undef, EVP_md5, SN_md5WithRSAEncryption, LN_md5WithRSAEncryption},
93 {NID_undef, EVP_sha1, SN_sha1WithRSAEncryption, LN_sha1WithRSAEncryption},
94 {NID_undef, EVP_sha224, SN_sha224WithRSAEncryption,
95 LN_sha224WithRSAEncryption},
96 {NID_undef, EVP_sha256, SN_sha256WithRSAEncryption,
97 LN_sha256WithRSAEncryption},
98 {NID_undef, EVP_sha384, SN_sha384WithRSAEncryption,
99 LN_sha384WithRSAEncryption},
100 {NID_undef, EVP_sha512, SN_sha512WithRSAEncryption,
101 LN_sha512WithRSAEncryption},
102 };
103
EVP_get_digestbynid(int nid)104 const EVP_MD* EVP_get_digestbynid(int nid) {
105 if (nid == NID_undef) {
106 // Skip the |NID_undef| entries in |nid_to_digest_mapping|.
107 return NULL;
108 }
109
110 for (unsigned i = 0; i < OPENSSL_ARRAY_SIZE(nid_to_digest_mapping); i++) {
111 if (nid_to_digest_mapping[i].nid == nid) {
112 return nid_to_digest_mapping[i].md_func();
113 }
114 }
115
116 return NULL;
117 }
118
119 static const struct {
120 uint8_t oid[9];
121 uint8_t oid_len;
122 int nid;
123 } kMDOIDs[] = {
124 // 1.2.840.113549.2.4
125 { {0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x04}, 8, NID_md4 },
126 // 1.2.840.113549.2.5
127 { {0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05}, 8, NID_md5 },
128 // 1.3.14.3.2.26
129 { {0x2b, 0x0e, 0x03, 0x02, 0x1a}, 5, NID_sha1 },
130 // 2.16.840.1.101.3.4.2.1
131 { {0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01}, 9, NID_sha256 },
132 // 2.16.840.1.101.3.4.2.2
133 { {0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02}, 9, NID_sha384 },
134 // 2.16.840.1.101.3.4.2.3
135 { {0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03}, 9, NID_sha512 },
136 // 2.16.840.1.101.3.4.2.4
137 { {0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04}, 9, NID_sha224 },
138 };
139
cbs_to_md(const CBS * cbs)140 static const EVP_MD *cbs_to_md(const CBS *cbs) {
141 for (size_t i = 0; i < OPENSSL_ARRAY_SIZE(kMDOIDs); i++) {
142 if (CBS_len(cbs) == kMDOIDs[i].oid_len &&
143 OPENSSL_memcmp(CBS_data(cbs), kMDOIDs[i].oid, kMDOIDs[i].oid_len) ==
144 0) {
145 return EVP_get_digestbynid(kMDOIDs[i].nid);
146 }
147 }
148
149 return NULL;
150 }
151
EVP_get_digestbyobj(const ASN1_OBJECT * obj)152 const EVP_MD *EVP_get_digestbyobj(const ASN1_OBJECT *obj) {
153 // Handle objects with no corresponding OID.
154 if (obj->nid != NID_undef) {
155 return EVP_get_digestbynid(obj->nid);
156 }
157
158 CBS cbs;
159 CBS_init(&cbs, obj->data, obj->length);
160 return cbs_to_md(&cbs);
161 }
162
EVP_parse_digest_algorithm(CBS * cbs)163 const EVP_MD *EVP_parse_digest_algorithm(CBS *cbs) {
164 CBS algorithm, oid;
165 if (!CBS_get_asn1(cbs, &algorithm, CBS_ASN1_SEQUENCE) ||
166 !CBS_get_asn1(&algorithm, &oid, CBS_ASN1_OBJECT)) {
167 OPENSSL_PUT_ERROR(DIGEST, DIGEST_R_DECODE_ERROR);
168 return NULL;
169 }
170
171 const EVP_MD *ret = cbs_to_md(&oid);
172 if (ret == NULL) {
173 OPENSSL_PUT_ERROR(DIGEST, DIGEST_R_UNKNOWN_HASH);
174 return NULL;
175 }
176
177 // The parameters, if present, must be NULL. Historically, whether the NULL
178 // was included or omitted was not well-specified. When parsing an
179 // AlgorithmIdentifier, we allow both. (Note this code is not used when
180 // verifying RSASSA-PKCS1-v1_5 signatures.)
181 if (CBS_len(&algorithm) > 0) {
182 CBS param;
183 if (!CBS_get_asn1(&algorithm, ¶m, CBS_ASN1_NULL) ||
184 CBS_len(¶m) != 0 ||
185 CBS_len(&algorithm) != 0) {
186 OPENSSL_PUT_ERROR(DIGEST, DIGEST_R_DECODE_ERROR);
187 return NULL;
188 }
189 }
190
191 return ret;
192 }
193
EVP_marshal_digest_algorithm(CBB * cbb,const EVP_MD * md)194 int EVP_marshal_digest_algorithm(CBB *cbb, const EVP_MD *md) {
195 CBB algorithm, oid, null;
196 if (!CBB_add_asn1(cbb, &algorithm, CBS_ASN1_SEQUENCE) ||
197 !CBB_add_asn1(&algorithm, &oid, CBS_ASN1_OBJECT)) {
198 OPENSSL_PUT_ERROR(DIGEST, ERR_R_MALLOC_FAILURE);
199 return 0;
200 }
201
202 int found = 0;
203 int nid = EVP_MD_type(md);
204 for (size_t i = 0; i < OPENSSL_ARRAY_SIZE(kMDOIDs); i++) {
205 if (nid == kMDOIDs[i].nid) {
206 if (!CBB_add_bytes(&oid, kMDOIDs[i].oid, kMDOIDs[i].oid_len)) {
207 OPENSSL_PUT_ERROR(DIGEST, ERR_R_MALLOC_FAILURE);
208 return 0;
209 }
210 found = 1;
211 break;
212 }
213 }
214
215 if (!found) {
216 OPENSSL_PUT_ERROR(DIGEST, DIGEST_R_UNKNOWN_HASH);
217 return 0;
218 }
219
220 if (!CBB_add_asn1(&algorithm, &null, CBS_ASN1_NULL) ||
221 !CBB_flush(cbb)) {
222 OPENSSL_PUT_ERROR(DIGEST, ERR_R_MALLOC_FAILURE);
223 return 0;
224 }
225
226 return 1;
227 }
228
EVP_get_digestbyname(const char * name)229 const EVP_MD *EVP_get_digestbyname(const char *name) {
230 for (unsigned i = 0; i < OPENSSL_ARRAY_SIZE(nid_to_digest_mapping); i++) {
231 const char *short_name = nid_to_digest_mapping[i].short_name;
232 const char *long_name = nid_to_digest_mapping[i].long_name;
233 if ((short_name && strcmp(short_name, name) == 0) ||
234 (long_name && strcmp(long_name, name) == 0)) {
235 return nid_to_digest_mapping[i].md_func();
236 }
237 }
238
239 return NULL;
240 }
241