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429168e7 | 1 | /* rsa_pss.c */ |
2e597528 | 2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
429168e7 DSH |
3 | * project 2005. |
4 | */ | |
5 | /* ==================================================================== | |
6 | * Copyright (c) 2005 The OpenSSL Project. All rights reserved. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in | |
17 | * the documentation and/or other materials provided with the | |
18 | * distribution. | |
19 | * | |
20 | * 3. All advertising materials mentioning features or use of this | |
21 | * software must display the following acknowledgment: | |
22 | * "This product includes software developed by the OpenSSL Project | |
23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
24 | * | |
25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
26 | * endorse or promote products derived from this software without | |
27 | * prior written permission. For written permission, please contact | |
28 | * licensing@OpenSSL.org. | |
29 | * | |
30 | * 5. Products derived from this software may not be called "OpenSSL" | |
31 | * nor may "OpenSSL" appear in their names without prior written | |
32 | * permission of the OpenSSL Project. | |
33 | * | |
34 | * 6. Redistributions of any form whatsoever must retain the following | |
35 | * acknowledgment: | |
36 | * "This product includes software developed by the OpenSSL Project | |
37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
38 | * | |
39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
50 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
51 | * ==================================================================== | |
52 | * | |
53 | * This product includes cryptographic software written by Eric Young | |
54 | * (eay@cryptsoft.com). This product includes software written by Tim | |
55 | * Hudson (tjh@cryptsoft.com). | |
56 | * | |
57 | */ | |
58 | ||
59 | #include <stdio.h> | |
60 | #include "cryptlib.h" | |
61 | #include <openssl/bn.h> | |
62 | #include <openssl/rsa.h> | |
63 | #include <openssl/evp.h> | |
64 | #include <openssl/rand.h> | |
65 | #include <openssl/sha.h> | |
66 | ||
8215e7a9 | 67 | static const unsigned char zeroes[] = {0,0,0,0,0,0,0,0}; |
429168e7 | 68 | |
0491e058 AP |
69 | #if defined(_MSC_VER) && defined(_ARM_) |
70 | #pragma optimize("g", off) | |
71 | #endif | |
72 | ||
429168e7 DSH |
73 | int RSA_verify_PKCS1_PSS(RSA *rsa, const unsigned char *mHash, |
74 | const EVP_MD *Hash, const unsigned char *EM, int sLen) | |
75 | { | |
76 | int i; | |
77 | int ret = 0; | |
3129acbd | 78 | int hLen, maskedDBLen, MSBits, emLen; |
429168e7 DSH |
79 | const unsigned char *H; |
80 | unsigned char *DB = NULL; | |
81 | EVP_MD_CTX ctx; | |
82 | unsigned char H_[EVP_MAX_MD_SIZE]; | |
d51204f1 | 83 | |
429168e7 | 84 | hLen = EVP_MD_size(Hash); |
d51204f1 AP |
85 | /* |
86 | * Negative sLen has special meanings: | |
87 | * -1 sLen == hLen | |
88 | * -2 salt length is autorecovered from signature | |
89 | * -N reserved | |
90 | */ | |
91 | if (sLen == -1) sLen = hLen; | |
92 | else if (sLen == -2) sLen = -2; | |
93 | else if (sLen < -2) | |
429168e7 | 94 | { |
d51204f1 | 95 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED); |
429168e7 DSH |
96 | goto err; |
97 | } | |
d51204f1 AP |
98 | |
99 | MSBits = (BN_num_bits(rsa->n) - 1) & 0x7; | |
100 | emLen = RSA_size(rsa); | |
3129acbd | 101 | if (EM[0] & (0xFF << MSBits)) |
429168e7 DSH |
102 | { |
103 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_FIRST_OCTET_INVALID); | |
104 | goto err; | |
105 | } | |
d51204f1 | 106 | if (MSBits == 0) |
3129acbd DSH |
107 | { |
108 | EM++; | |
109 | emLen--; | |
110 | } | |
d51204f1 AP |
111 | if (emLen < (hLen + sLen + 2)) /* sLen can be small negative */ |
112 | { | |
113 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_DATA_TOO_LARGE); | |
114 | goto err; | |
115 | } | |
116 | if (EM[emLen - 1] != 0xbc) | |
117 | { | |
118 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_LAST_OCTET_INVALID); | |
119 | goto err; | |
120 | } | |
429168e7 DSH |
121 | maskedDBLen = emLen - hLen - 1; |
122 | H = EM + maskedDBLen; | |
123 | DB = OPENSSL_malloc(maskedDBLen); | |
124 | if (!DB) | |
125 | { | |
126 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, ERR_R_MALLOC_FAILURE); | |
127 | goto err; | |
128 | } | |
129 | PKCS1_MGF1(DB, maskedDBLen, H, hLen, Hash); | |
130 | for (i = 0; i < maskedDBLen; i++) | |
131 | DB[i] ^= EM[i]; | |
3129acbd DSH |
132 | if (MSBits) |
133 | DB[0] &= 0xFF >> (8 - MSBits); | |
d51204f1 AP |
134 | for (i = 0; DB[i] == 0 && i < (maskedDBLen-1); i++) ; |
135 | if (DB[i++] != 0x1) | |
429168e7 | 136 | { |
d51204f1 AP |
137 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_SLEN_RECOVERY_FAILED); |
138 | goto err; | |
429168e7 | 139 | } |
d51204f1 | 140 | if (sLen >= 0 && (maskedDBLen - i) != sLen) |
429168e7 | 141 | { |
d51204f1 | 142 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED); |
429168e7 DSH |
143 | goto err; |
144 | } | |
145 | EVP_MD_CTX_init(&ctx); | |
146 | EVP_DigestInit_ex(&ctx, Hash, NULL); | |
147 | EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes); | |
148 | EVP_DigestUpdate(&ctx, mHash, hLen); | |
d51204f1 AP |
149 | if (maskedDBLen - i) |
150 | EVP_DigestUpdate(&ctx, DB + i, maskedDBLen - i); | |
429168e7 DSH |
151 | EVP_DigestFinal(&ctx, H_, NULL); |
152 | EVP_MD_CTX_cleanup(&ctx); | |
153 | if (memcmp(H_, H, hLen)) | |
154 | { | |
155 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_BAD_SIGNATURE); | |
156 | ret = 0; | |
157 | } | |
158 | else | |
159 | ret = 1; | |
160 | ||
161 | err: | |
162 | if (DB) | |
163 | OPENSSL_free(DB); | |
164 | ||
165 | return ret; | |
166 | ||
167 | } | |
168 | ||
169 | int RSA_padding_add_PKCS1_PSS(RSA *rsa, unsigned char *EM, | |
170 | const unsigned char *mHash, | |
171 | const EVP_MD *Hash, int sLen) | |
172 | { | |
173 | int i; | |
174 | int ret = 0; | |
3129acbd | 175 | int hLen, maskedDBLen, MSBits, emLen; |
429168e7 DSH |
176 | unsigned char *H, *salt = NULL, *p; |
177 | EVP_MD_CTX ctx; | |
d51204f1 | 178 | |
429168e7 | 179 | hLen = EVP_MD_size(Hash); |
d51204f1 AP |
180 | /* |
181 | * Negative sLen has special meanings: | |
182 | * -1 sLen == hLen | |
183 | * -2 salt length is maximized | |
184 | * -N reserved | |
185 | */ | |
186 | if (sLen == -1) sLen = hLen; | |
187 | else if (sLen == -2) sLen = -2; | |
188 | else if (sLen < -2) | |
429168e7 | 189 | { |
d51204f1 | 190 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED); |
429168e7 DSH |
191 | goto err; |
192 | } | |
d51204f1 AP |
193 | |
194 | MSBits = (BN_num_bits(rsa->n) - 1) & 0x7; | |
195 | emLen = RSA_size(rsa); | |
3129acbd DSH |
196 | if (MSBits == 0) |
197 | { | |
198 | *EM++ = 0; | |
199 | emLen--; | |
200 | } | |
d51204f1 AP |
201 | if (sLen == -2) |
202 | { | |
203 | sLen = emLen - hLen - 2; | |
204 | } | |
205 | else if (emLen < (hLen + sLen + 2)) | |
206 | { | |
207 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS, | |
208 | RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); | |
209 | goto err; | |
210 | } | |
429168e7 DSH |
211 | if (sLen > 0) |
212 | { | |
213 | salt = OPENSSL_malloc(sLen); | |
214 | if (!salt) | |
215 | { | |
216 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS, | |
217 | ERR_R_MALLOC_FAILURE); | |
218 | goto err; | |
219 | } | |
220 | if (!RAND_bytes(salt, sLen)) | |
221 | goto err; | |
222 | } | |
223 | maskedDBLen = emLen - hLen - 1; | |
224 | H = EM + maskedDBLen; | |
225 | EVP_MD_CTX_init(&ctx); | |
226 | EVP_DigestInit_ex(&ctx, Hash, NULL); | |
227 | EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes); | |
228 | EVP_DigestUpdate(&ctx, mHash, hLen); | |
229 | if (sLen) | |
230 | EVP_DigestUpdate(&ctx, salt, sLen); | |
231 | EVP_DigestFinal(&ctx, H, NULL); | |
232 | EVP_MD_CTX_cleanup(&ctx); | |
233 | ||
234 | /* Generate dbMask in place then perform XOR on it */ | |
235 | PKCS1_MGF1(EM, maskedDBLen, H, hLen, Hash); | |
236 | ||
237 | p = EM; | |
238 | ||
239 | /* Initial PS XORs with all zeroes which is a NOP so just update | |
240 | * pointer. Note from a test above this value is guaranteed to | |
241 | * be non-negative. | |
242 | */ | |
243 | p += emLen - sLen - hLen - 2; | |
244 | *p++ ^= 0x1; | |
245 | if (sLen > 0) | |
246 | { | |
247 | for (i = 0; i < sLen; i++) | |
248 | *p++ ^= salt[i]; | |
249 | } | |
3129acbd DSH |
250 | if (MSBits) |
251 | EM[0] &= 0xFF >> (8 - MSBits); | |
429168e7 DSH |
252 | |
253 | /* H is already in place so just set final 0xbc */ | |
254 | ||
255 | EM[emLen - 1] = 0xbc; | |
256 | ||
257 | ret = 1; | |
258 | ||
259 | err: | |
260 | if (salt) | |
261 | OPENSSL_free(salt); | |
262 | ||
263 | return ret; | |
264 | ||
265 | } | |
0491e058 AP |
266 | |
267 | #if defined(_MSC_VER) | |
268 | #pragma optimize("",on) | |
269 | #endif |