1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 }; 103 104 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 }; 139 140 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 } 151 152 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 } 162 163 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 } 193 194 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 } 228 229 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
