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
69struct 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
76static 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
105const 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
120static 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
141static 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
153const 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
164const 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, &param, CBS_ASN1_NULL) ||
185        CBS_len(&param) != 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
195const 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