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Side by Side Diff: src/platform/vboot_reference/crypto/rsa.c

Issue 1585007: combined patch for: (Closed)
Patch Set: Created 10 years, 8 months ago
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1 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved. 1 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
2 * Use of this source code is governed by a BSD-style license that can be 2 * Use of this source code is governed by a BSD-style license that can be
3 * found in the LICENSE file. 3 * found in the LICENSE file.
4 */ 4 */
5 5
6 /* Implementation of RSA signature verification which uses a pre-processed 6 /* Implementation of RSA signature verification which uses a pre-processed
7 * key for computation. The code extends Android's RSA verification code to 7 * key for computation. The code extends Android's RSA verification code to
8 * support multiple RSA key lengths and hash digest algorithms. 8 * support multiple RSA key lengths and hash digest algorithms.
9 */ 9 */
10 10
11 #include <stdio.h> 11 #include "cryptolib.h"
12
13 #include "padding.h"
14 #include "rsa.h"
15 #include "utility.h" 12 #include "utility.h"
16 13
17 /* a[] -= mod */ 14 /* a[] -= mod */
18 static void subM(const RSAPublicKey *key, uint32_t *a) { 15 static void subM(const RSAPublicKey *key, uint32_t *a) {
19 int64_t A = 0; 16 int64_t A = 0;
20 int i; 17 int i;
21 for (i = 0; i < key->len; ++i) { 18 for (i = 0; i < key->len; ++i) {
22 A += (uint64_t)a[i] - key->n[i]; 19 A += (uint64_t)a[i] - key->n[i];
23 a[i] = (uint32_t)A; 20 a[i] = (uint32_t)A;
24 A >>= 32; 21 A >>= 32;
(...skipping 106 matching lines...) Expand 10 before | Expand all | Expand 10 after
131 const uint8_t *sig, 128 const uint8_t *sig,
132 const int sig_len, 129 const int sig_len,
133 const uint8_t sig_type, 130 const uint8_t sig_type,
134 const uint8_t *hash) { 131 const uint8_t *hash) {
135 int i; 132 int i;
136 uint8_t* buf; 133 uint8_t* buf;
137 const uint8_t* padding; 134 const uint8_t* padding;
138 int success = 1; 135 int success = 1;
139 136
140 if (sig_len != (key->len * sizeof(uint32_t))) { 137 if (sig_len != (key->len * sizeof(uint32_t))) {
141 fprintf(stderr, "Signature is of incorrect length!\n"); 138 debug("Signature is of incorrect length!\n");
142 return 0; 139 return 0;
143 } 140 }
144 141
145 if (sig_type >= kNumAlgorithms) { 142 if (sig_type >= kNumAlgorithms) {
146 fprintf(stderr, "Invalid signature type!\n"); 143 debug("Invalid signature type!\n");
147 return 0; 144 return 0;
148 } 145 }
149 146
150 if (key->len != siglen_map[sig_type] / sizeof(uint32_t)) { 147 if (key->len != siglen_map[sig_type] / sizeof(uint32_t)) {
151 fprintf(stderr, "Wrong key passed in!\n"); 148 debug("Wrong key passed in!\n");
152 return 0; 149 return 0;
153 } 150 }
154 151
155 buf = (uint8_t*) Malloc(sig_len); 152 buf = (uint8_t*) Malloc(sig_len);
156 Memcpy(buf, sig, sig_len); 153 Memcpy(buf, sig, sig_len);
157 154
158 modpowF4(key, buf); 155 modpowF4(key, buf);
159 156
160 /* Determine padding to use depending on the signature type. */ 157 /* Determine padding to use depending on the signature type. */
161 padding = padding_map[sig_type]; 158 padding = padding_map[sig_type];
162 159
163 /* Check pkcs1.5 padding bytes. */ 160 /* Check pkcs1.5 padding bytes. */
164 for (i = 0; i < padding_size_map[sig_type]; ++i) { 161 for (i = 0; i < padding_size_map[sig_type]; ++i) {
165 if (buf[i] != padding[i]) { 162 if (buf[i] != padding[i]) {
166 #ifndef NDEBUG 163 #ifndef NDEBUG
167 /* TODO(gauravsh): Replace with a macro call for logging. */ 164 /* TODO(gauravsh): Replace with a macro call for logging. */
168 fprintf(stderr, "Padding: Expecting = %02x Got = %02x\n", padding[i], 165 debug("Padding: Expecting = %02x Got = %02x\n", padding[i],
169 buf[i]); 166 buf[i]);
170 #endif 167 #endif
171 success = 0; 168 success = 0;
172 } 169 }
173 } 170 }
174 171
175 /* Check if digest matches. */ 172 /* Check if digest matches. */
176 for (; i < sig_len; ++i) { 173 for (; i < sig_len; ++i) {
177 if (buf[i] != *hash++) { 174 if (buf[i] != *hash++) {
178 #ifndef NDEBUG 175 #ifndef NDEBUG
179 /* TODO(gauravsh): Replace with a macro call for logging. */ 176 /* TODO(gauravsh): Replace with a macro call for logging. */
180 fprintf(stderr, "Digest: Expecting = %02x Got = %02x\n", padding[i], 177 debug("Digest: Expecting = %02x Got = %02x\n", padding[i],
181 buf[i]); 178 buf[i]);
182 #endif 179 #endif
183 success = 0; 180 success = 0;
184 } 181 }
185 } 182 }
186 183
187 Free(buf); 184 Free(buf);
188 185
189 return success; 186 return success;
190 } 187 }
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