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 #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 }; 104 105 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 }; 140 141 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 } 152 153 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 } 163 164 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 } 194 195 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
