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429168e7 | 1 | /* rsa_pss.c */ |
0f113f3e MC |
2 | /* |
3 | * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project | |
4 | * 2005. | |
429168e7 DSH |
5 | */ |
6 | /* ==================================================================== | |
7 | * Copyright (c) 2005 The OpenSSL Project. All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 14 | * notice, this list of conditions and the following disclaimer. |
429168e7 DSH |
15 | * |
16 | * 2. Redistributions in binary form must reproduce the above copyright | |
17 | * notice, this list of conditions and the following disclaimer in | |
18 | * the documentation and/or other materials provided with the | |
19 | * distribution. | |
20 | * | |
21 | * 3. All advertising materials mentioning features or use of this | |
22 | * software must display the following acknowledgment: | |
23 | * "This product includes software developed by the OpenSSL Project | |
24 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
25 | * | |
26 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
27 | * endorse or promote products derived from this software without | |
28 | * prior written permission. For written permission, please contact | |
29 | * licensing@OpenSSL.org. | |
30 | * | |
31 | * 5. Products derived from this software may not be called "OpenSSL" | |
32 | * nor may "OpenSSL" appear in their names without prior written | |
33 | * permission of the OpenSSL Project. | |
34 | * | |
35 | * 6. Redistributions of any form whatsoever must retain the following | |
36 | * acknowledgment: | |
37 | * "This product includes software developed by the OpenSSL Project | |
38 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
41 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
43 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
44 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
45 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
46 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
47 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
49 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
50 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
51 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
52 | * ==================================================================== | |
53 | * | |
54 | * This product includes cryptographic software written by Eric Young | |
55 | * (eay@cryptsoft.com). This product includes software written by Tim | |
56 | * Hudson (tjh@cryptsoft.com). | |
57 | * | |
58 | */ | |
59 | ||
60 | #include <stdio.h> | |
b39fc560 | 61 | #include "internal/cryptlib.h" |
429168e7 DSH |
62 | #include <openssl/bn.h> |
63 | #include <openssl/rsa.h> | |
64 | #include <openssl/evp.h> | |
65 | #include <openssl/rand.h> | |
66 | #include <openssl/sha.h> | |
e8254d40 | 67 | #include "rsa_locl.h" |
429168e7 | 68 | |
0f113f3e | 69 | static const unsigned char zeroes[] = { 0, 0, 0, 0, 0, 0, 0, 0 }; |
429168e7 | 70 | |
0491e058 | 71 | #if defined(_MSC_VER) && defined(_ARM_) |
0f113f3e | 72 | # pragma optimize("g", off) |
0491e058 AP |
73 | #endif |
74 | ||
429168e7 | 75 | int RSA_verify_PKCS1_PSS(RSA *rsa, const unsigned char *mHash, |
0f113f3e MC |
76 | const EVP_MD *Hash, const unsigned char *EM, |
77 | int sLen) | |
78 | { | |
79 | return RSA_verify_PKCS1_PSS_mgf1(rsa, mHash, Hash, NULL, EM, sLen); | |
80 | } | |
e8254d40 DSH |
81 | |
82 | int RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const unsigned char *mHash, | |
0f113f3e MC |
83 | const EVP_MD *Hash, const EVP_MD *mgf1Hash, |
84 | const unsigned char *EM, int sLen) | |
85 | { | |
86 | int i; | |
87 | int ret = 0; | |
88 | int hLen, maskedDBLen, MSBits, emLen; | |
89 | const unsigned char *H; | |
90 | unsigned char *DB = NULL; | |
91 | EVP_MD_CTX ctx; | |
92 | unsigned char H_[EVP_MAX_MD_SIZE]; | |
93 | EVP_MD_CTX_init(&ctx); | |
d51204f1 | 94 | |
0f113f3e MC |
95 | if (mgf1Hash == NULL) |
96 | mgf1Hash = Hash; | |
e8254d40 | 97 | |
0f113f3e MC |
98 | hLen = M_EVP_MD_size(Hash); |
99 | if (hLen < 0) | |
100 | goto err; | |
50e735f9 MC |
101 | /*- |
102 | * Negative sLen has special meanings: | |
103 | * -1 sLen == hLen | |
104 | * -2 salt length is autorecovered from signature | |
105 | * -N reserved | |
106 | */ | |
0f113f3e MC |
107 | if (sLen == -1) |
108 | sLen = hLen; | |
109 | else if (sLen == -2) | |
110 | sLen = -2; | |
111 | else if (sLen < -2) { | |
112 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED); | |
113 | goto err; | |
114 | } | |
d51204f1 | 115 | |
0f113f3e MC |
116 | MSBits = (BN_num_bits(rsa->n) - 1) & 0x7; |
117 | emLen = RSA_size(rsa); | |
118 | if (EM[0] & (0xFF << MSBits)) { | |
119 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_FIRST_OCTET_INVALID); | |
120 | goto err; | |
121 | } | |
122 | if (MSBits == 0) { | |
123 | EM++; | |
124 | emLen--; | |
125 | } | |
126 | if (emLen < (hLen + sLen + 2)) { /* sLen can be small negative */ | |
127 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_DATA_TOO_LARGE); | |
128 | goto err; | |
129 | } | |
130 | if (EM[emLen - 1] != 0xbc) { | |
131 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_LAST_OCTET_INVALID); | |
132 | goto err; | |
133 | } | |
134 | maskedDBLen = emLen - hLen - 1; | |
135 | H = EM + maskedDBLen; | |
136 | DB = OPENSSL_malloc(maskedDBLen); | |
137 | if (!DB) { | |
138 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, ERR_R_MALLOC_FAILURE); | |
139 | goto err; | |
140 | } | |
141 | if (PKCS1_MGF1(DB, maskedDBLen, H, hLen, mgf1Hash) < 0) | |
142 | goto err; | |
143 | for (i = 0; i < maskedDBLen; i++) | |
144 | DB[i] ^= EM[i]; | |
145 | if (MSBits) | |
146 | DB[0] &= 0xFF >> (8 - MSBits); | |
147 | for (i = 0; DB[i] == 0 && i < (maskedDBLen - 1); i++) ; | |
148 | if (DB[i++] != 0x1) { | |
149 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_RECOVERY_FAILED); | |
150 | goto err; | |
151 | } | |
152 | if (sLen >= 0 && (maskedDBLen - i) != sLen) { | |
153 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED); | |
154 | goto err; | |
155 | } | |
156 | if (!EVP_DigestInit_ex(&ctx, Hash, NULL) | |
157 | || !EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes) | |
158 | || !EVP_DigestUpdate(&ctx, mHash, hLen)) | |
159 | goto err; | |
160 | if (maskedDBLen - i) { | |
161 | if (!EVP_DigestUpdate(&ctx, DB + i, maskedDBLen - i)) | |
162 | goto err; | |
163 | } | |
164 | if (!EVP_DigestFinal_ex(&ctx, H_, NULL)) | |
165 | goto err; | |
166 | if (memcmp(H_, H, hLen)) { | |
167 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_BAD_SIGNATURE); | |
168 | ret = 0; | |
169 | } else | |
170 | ret = 1; | |
429168e7 | 171 | |
0f113f3e | 172 | err: |
b548a1f1 | 173 | OPENSSL_free(DB); |
0f113f3e | 174 | EVP_MD_CTX_cleanup(&ctx); |
429168e7 | 175 | |
0f113f3e | 176 | return ret; |
429168e7 | 177 | |
0f113f3e | 178 | } |
429168e7 DSH |
179 | |
180 | int RSA_padding_add_PKCS1_PSS(RSA *rsa, unsigned char *EM, | |
0f113f3e MC |
181 | const unsigned char *mHash, |
182 | const EVP_MD *Hash, int sLen) | |
183 | { | |
184 | return RSA_padding_add_PKCS1_PSS_mgf1(rsa, EM, mHash, Hash, NULL, sLen); | |
185 | } | |
e8254d40 DSH |
186 | |
187 | int RSA_padding_add_PKCS1_PSS_mgf1(RSA *rsa, unsigned char *EM, | |
0f113f3e MC |
188 | const unsigned char *mHash, |
189 | const EVP_MD *Hash, const EVP_MD *mgf1Hash, | |
190 | int sLen) | |
191 | { | |
192 | int i; | |
193 | int ret = 0; | |
194 | int hLen, maskedDBLen, MSBits, emLen; | |
195 | unsigned char *H, *salt = NULL, *p; | |
196 | EVP_MD_CTX ctx; | |
d51204f1 | 197 | |
0f113f3e MC |
198 | if (mgf1Hash == NULL) |
199 | mgf1Hash = Hash; | |
e8254d40 | 200 | |
0f113f3e MC |
201 | hLen = M_EVP_MD_size(Hash); |
202 | if (hLen < 0) | |
203 | goto err; | |
50e735f9 MC |
204 | /*- |
205 | * Negative sLen has special meanings: | |
206 | * -1 sLen == hLen | |
207 | * -2 salt length is maximized | |
208 | * -N reserved | |
209 | */ | |
0f113f3e MC |
210 | if (sLen == -1) |
211 | sLen = hLen; | |
212 | else if (sLen == -2) | |
213 | sLen = -2; | |
214 | else if (sLen < -2) { | |
215 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED); | |
216 | goto err; | |
217 | } | |
d51204f1 | 218 | |
0f113f3e MC |
219 | MSBits = (BN_num_bits(rsa->n) - 1) & 0x7; |
220 | emLen = RSA_size(rsa); | |
221 | if (MSBits == 0) { | |
222 | *EM++ = 0; | |
223 | emLen--; | |
224 | } | |
225 | if (sLen == -2) { | |
226 | sLen = emLen - hLen - 2; | |
227 | } else if (emLen < (hLen + sLen + 2)) { | |
228 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, | |
229 | RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); | |
230 | goto err; | |
231 | } | |
232 | if (sLen > 0) { | |
233 | salt = OPENSSL_malloc(sLen); | |
234 | if (!salt) { | |
235 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, | |
236 | ERR_R_MALLOC_FAILURE); | |
237 | goto err; | |
238 | } | |
239 | if (RAND_bytes(salt, sLen) <= 0) | |
240 | goto err; | |
241 | } | |
242 | maskedDBLen = emLen - hLen - 1; | |
243 | H = EM + maskedDBLen; | |
244 | EVP_MD_CTX_init(&ctx); | |
245 | if (!EVP_DigestInit_ex(&ctx, Hash, NULL) | |
246 | || !EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes) | |
247 | || !EVP_DigestUpdate(&ctx, mHash, hLen)) | |
248 | goto err; | |
249 | if (sLen && !EVP_DigestUpdate(&ctx, salt, sLen)) | |
250 | goto err; | |
251 | if (!EVP_DigestFinal_ex(&ctx, H, NULL)) | |
252 | goto err; | |
253 | EVP_MD_CTX_cleanup(&ctx); | |
429168e7 | 254 | |
0f113f3e MC |
255 | /* Generate dbMask in place then perform XOR on it */ |
256 | if (PKCS1_MGF1(EM, maskedDBLen, H, hLen, mgf1Hash)) | |
257 | goto err; | |
429168e7 | 258 | |
0f113f3e | 259 | p = EM; |
429168e7 | 260 | |
0f113f3e MC |
261 | /* |
262 | * Initial PS XORs with all zeroes which is a NOP so just update pointer. | |
263 | * Note from a test above this value is guaranteed to be non-negative. | |
264 | */ | |
265 | p += emLen - sLen - hLen - 2; | |
266 | *p++ ^= 0x1; | |
267 | if (sLen > 0) { | |
268 | for (i = 0; i < sLen; i++) | |
269 | *p++ ^= salt[i]; | |
270 | } | |
271 | if (MSBits) | |
272 | EM[0] &= 0xFF >> (8 - MSBits); | |
429168e7 | 273 | |
0f113f3e | 274 | /* H is already in place so just set final 0xbc */ |
429168e7 | 275 | |
0f113f3e | 276 | EM[emLen - 1] = 0xbc; |
429168e7 | 277 | |
0f113f3e | 278 | ret = 1; |
429168e7 | 279 | |
0f113f3e | 280 | err: |
b548a1f1 | 281 | OPENSSL_free(salt); |
429168e7 | 282 | |
0f113f3e | 283 | return ret; |
429168e7 | 284 | |
0f113f3e | 285 | } |
0491e058 AP |
286 | |
287 | #if defined(_MSC_VER) | |
0f113f3e | 288 | # pragma optimize("",on) |
0491e058 | 289 | #endif |