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Commit | Line | Data |
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0f113f3e | 1 | /* |
82eba370 | 2 | * Copyright 2005-2018 The OpenSSL Project Authors. All Rights Reserved. |
429168e7 | 3 | * |
2a7b6f39 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
2039c421 RS |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
429168e7 DSH |
8 | */ |
9 | ||
10 | #include <stdio.h> | |
b39fc560 | 11 | #include "internal/cryptlib.h" |
429168e7 DSH |
12 | #include <openssl/bn.h> |
13 | #include <openssl/rsa.h> | |
14 | #include <openssl/evp.h> | |
15 | #include <openssl/rand.h> | |
16 | #include <openssl/sha.h> | |
706457b7 | 17 | #include "rsa_local.h" |
429168e7 | 18 | |
0f113f3e | 19 | static const unsigned char zeroes[] = { 0, 0, 0, 0, 0, 0, 0, 0 }; |
429168e7 | 20 | |
0491e058 | 21 | #if defined(_MSC_VER) && defined(_ARM_) |
0f113f3e | 22 | # pragma optimize("g", off) |
0491e058 AP |
23 | #endif |
24 | ||
429168e7 | 25 | int RSA_verify_PKCS1_PSS(RSA *rsa, const unsigned char *mHash, |
0f113f3e MC |
26 | const EVP_MD *Hash, const unsigned char *EM, |
27 | int sLen) | |
28 | { | |
29 | return RSA_verify_PKCS1_PSS_mgf1(rsa, mHash, Hash, NULL, EM, sLen); | |
30 | } | |
e8254d40 DSH |
31 | |
32 | int RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const unsigned char *mHash, | |
0f113f3e MC |
33 | const EVP_MD *Hash, const EVP_MD *mgf1Hash, |
34 | const unsigned char *EM, int sLen) | |
35 | { | |
36 | int i; | |
37 | int ret = 0; | |
38 | int hLen, maskedDBLen, MSBits, emLen; | |
39 | const unsigned char *H; | |
40 | unsigned char *DB = NULL; | |
bfb0641f | 41 | EVP_MD_CTX *ctx = EVP_MD_CTX_new(); |
0f113f3e | 42 | unsigned char H_[EVP_MAX_MD_SIZE]; |
6e59a892 | 43 | |
6e59a892 RL |
44 | if (ctx == NULL) |
45 | goto err; | |
d51204f1 | 46 | |
0f113f3e MC |
47 | if (mgf1Hash == NULL) |
48 | mgf1Hash = Hash; | |
e8254d40 | 49 | |
6e59a892 | 50 | hLen = EVP_MD_size(Hash); |
0f113f3e MC |
51 | if (hLen < 0) |
52 | goto err; | |
50e735f9 MC |
53 | /*- |
54 | * Negative sLen has special meanings: | |
55 | * -1 sLen == hLen | |
56 | * -2 salt length is autorecovered from signature | |
108909d3 | 57 | * -3 salt length is maximized |
50e735f9 MC |
58 | * -N reserved |
59 | */ | |
90862ab4 | 60 | if (sLen == RSA_PSS_SALTLEN_DIGEST) { |
0f113f3e | 61 | sLen = hLen; |
90862ab4 | 62 | } else if (sLen < RSA_PSS_SALTLEN_MAX) { |
0f113f3e MC |
63 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED); |
64 | goto err; | |
65 | } | |
d51204f1 | 66 | |
0f113f3e MC |
67 | MSBits = (BN_num_bits(rsa->n) - 1) & 0x7; |
68 | emLen = RSA_size(rsa); | |
69 | if (EM[0] & (0xFF << MSBits)) { | |
70 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_FIRST_OCTET_INVALID); | |
71 | goto err; | |
72 | } | |
73 | if (MSBits == 0) { | |
74 | EM++; | |
75 | emLen--; | |
76 | } | |
108909d3 BE |
77 | if (emLen < hLen + 2) { |
78 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_DATA_TOO_LARGE); | |
79 | goto err; | |
80 | } | |
137096a7 DSH |
81 | if (sLen == RSA_PSS_SALTLEN_MAX) { |
82 | sLen = emLen - hLen - 2; | |
108909d3 | 83 | } else if (sLen > emLen - hLen - 2) { /* sLen can be small negative */ |
0f113f3e MC |
84 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_DATA_TOO_LARGE); |
85 | goto err; | |
86 | } | |
87 | if (EM[emLen - 1] != 0xbc) { | |
88 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_LAST_OCTET_INVALID); | |
89 | goto err; | |
90 | } | |
91 | maskedDBLen = emLen - hLen - 1; | |
92 | H = EM + maskedDBLen; | |
93 | DB = OPENSSL_malloc(maskedDBLen); | |
90945fa3 | 94 | if (DB == NULL) { |
0f113f3e MC |
95 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, ERR_R_MALLOC_FAILURE); |
96 | goto err; | |
97 | } | |
98 | if (PKCS1_MGF1(DB, maskedDBLen, H, hLen, mgf1Hash) < 0) | |
99 | goto err; | |
100 | for (i = 0; i < maskedDBLen; i++) | |
101 | DB[i] ^= EM[i]; | |
102 | if (MSBits) | |
103 | DB[0] &= 0xFF >> (8 - MSBits); | |
104 | for (i = 0; DB[i] == 0 && i < (maskedDBLen - 1); i++) ; | |
105 | if (DB[i++] != 0x1) { | |
106 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_RECOVERY_FAILED); | |
107 | goto err; | |
108 | } | |
137096a7 | 109 | if (sLen != RSA_PSS_SALTLEN_AUTO && (maskedDBLen - i) != sLen) { |
0f113f3e MC |
110 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED); |
111 | goto err; | |
112 | } | |
6e59a892 | 113 | if (!EVP_DigestInit_ex(ctx, Hash, NULL) |
cbe29648 | 114 | || !EVP_DigestUpdate(ctx, zeroes, sizeof(zeroes)) |
6e59a892 | 115 | || !EVP_DigestUpdate(ctx, mHash, hLen)) |
0f113f3e MC |
116 | goto err; |
117 | if (maskedDBLen - i) { | |
6e59a892 | 118 | if (!EVP_DigestUpdate(ctx, DB + i, maskedDBLen - i)) |
0f113f3e MC |
119 | goto err; |
120 | } | |
6e59a892 | 121 | if (!EVP_DigestFinal_ex(ctx, H_, NULL)) |
0f113f3e MC |
122 | goto err; |
123 | if (memcmp(H_, H, hLen)) { | |
124 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_BAD_SIGNATURE); | |
125 | ret = 0; | |
90862ab4 | 126 | } else { |
0f113f3e | 127 | ret = 1; |
90862ab4 | 128 | } |
429168e7 | 129 | |
0f113f3e | 130 | err: |
b548a1f1 | 131 | OPENSSL_free(DB); |
bfb0641f | 132 | EVP_MD_CTX_free(ctx); |
429168e7 | 133 | |
0f113f3e | 134 | return ret; |
429168e7 | 135 | |
0f113f3e | 136 | } |
429168e7 DSH |
137 | |
138 | int RSA_padding_add_PKCS1_PSS(RSA *rsa, unsigned char *EM, | |
0f113f3e MC |
139 | const unsigned char *mHash, |
140 | const EVP_MD *Hash, int sLen) | |
141 | { | |
142 | return RSA_padding_add_PKCS1_PSS_mgf1(rsa, EM, mHash, Hash, NULL, sLen); | |
143 | } | |
e8254d40 DSH |
144 | |
145 | int RSA_padding_add_PKCS1_PSS_mgf1(RSA *rsa, unsigned char *EM, | |
0f113f3e MC |
146 | const unsigned char *mHash, |
147 | const EVP_MD *Hash, const EVP_MD *mgf1Hash, | |
148 | int sLen) | |
149 | { | |
150 | int i; | |
151 | int ret = 0; | |
152 | int hLen, maskedDBLen, MSBits, emLen; | |
153 | unsigned char *H, *salt = NULL, *p; | |
6e59a892 | 154 | EVP_MD_CTX *ctx = NULL; |
d51204f1 | 155 | |
0f113f3e MC |
156 | if (mgf1Hash == NULL) |
157 | mgf1Hash = Hash; | |
e8254d40 | 158 | |
6e59a892 | 159 | hLen = EVP_MD_size(Hash); |
0f113f3e MC |
160 | if (hLen < 0) |
161 | goto err; | |
50e735f9 MC |
162 | /*- |
163 | * Negative sLen has special meanings: | |
164 | * -1 sLen == hLen | |
165 | * -2 salt length is maximized | |
108909d3 | 166 | * -3 same as above (on signing) |
50e735f9 MC |
167 | * -N reserved |
168 | */ | |
90862ab4 | 169 | if (sLen == RSA_PSS_SALTLEN_DIGEST) { |
0f113f3e | 170 | sLen = hLen; |
90862ab4 | 171 | } else if (sLen == RSA_PSS_SALTLEN_MAX_SIGN) { |
137096a7 | 172 | sLen = RSA_PSS_SALTLEN_MAX; |
90862ab4 | 173 | } else if (sLen < RSA_PSS_SALTLEN_MAX) { |
0f113f3e MC |
174 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED); |
175 | goto err; | |
176 | } | |
d51204f1 | 177 | |
0f113f3e MC |
178 | MSBits = (BN_num_bits(rsa->n) - 1) & 0x7; |
179 | emLen = RSA_size(rsa); | |
180 | if (MSBits == 0) { | |
181 | *EM++ = 0; | |
182 | emLen--; | |
183 | } | |
108909d3 BE |
184 | if (emLen < hLen + 2) { |
185 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, | |
186 | RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); | |
187 | goto err; | |
188 | } | |
137096a7 | 189 | if (sLen == RSA_PSS_SALTLEN_MAX) { |
0f113f3e | 190 | sLen = emLen - hLen - 2; |
108909d3 | 191 | } else if (sLen > emLen - hLen - 2) { |
0f113f3e MC |
192 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, |
193 | RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); | |
194 | goto err; | |
195 | } | |
196 | if (sLen > 0) { | |
197 | salt = OPENSSL_malloc(sLen); | |
90945fa3 | 198 | if (salt == NULL) { |
0f113f3e MC |
199 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, |
200 | ERR_R_MALLOC_FAILURE); | |
201 | goto err; | |
202 | } | |
203 | if (RAND_bytes(salt, sLen) <= 0) | |
204 | goto err; | |
205 | } | |
206 | maskedDBLen = emLen - hLen - 1; | |
207 | H = EM + maskedDBLen; | |
bfb0641f | 208 | ctx = EVP_MD_CTX_new(); |
6e59a892 RL |
209 | if (ctx == NULL) |
210 | goto err; | |
211 | if (!EVP_DigestInit_ex(ctx, Hash, NULL) | |
cbe29648 | 212 | || !EVP_DigestUpdate(ctx, zeroes, sizeof(zeroes)) |
6e59a892 | 213 | || !EVP_DigestUpdate(ctx, mHash, hLen)) |
0f113f3e | 214 | goto err; |
6e59a892 | 215 | if (sLen && !EVP_DigestUpdate(ctx, salt, sLen)) |
0f113f3e | 216 | goto err; |
6e59a892 | 217 | if (!EVP_DigestFinal_ex(ctx, H, NULL)) |
0f113f3e | 218 | goto err; |
429168e7 | 219 | |
0f113f3e MC |
220 | /* Generate dbMask in place then perform XOR on it */ |
221 | if (PKCS1_MGF1(EM, maskedDBLen, H, hLen, mgf1Hash)) | |
222 | goto err; | |
429168e7 | 223 | |
0f113f3e | 224 | p = EM; |
429168e7 | 225 | |
0f113f3e MC |
226 | /* |
227 | * Initial PS XORs with all zeroes which is a NOP so just update pointer. | |
228 | * Note from a test above this value is guaranteed to be non-negative. | |
229 | */ | |
230 | p += emLen - sLen - hLen - 2; | |
231 | *p++ ^= 0x1; | |
232 | if (sLen > 0) { | |
233 | for (i = 0; i < sLen; i++) | |
234 | *p++ ^= salt[i]; | |
235 | } | |
236 | if (MSBits) | |
237 | EM[0] &= 0xFF >> (8 - MSBits); | |
429168e7 | 238 | |
0f113f3e | 239 | /* H is already in place so just set final 0xbc */ |
429168e7 | 240 | |
0f113f3e | 241 | EM[emLen - 1] = 0xbc; |
429168e7 | 242 | |
0f113f3e | 243 | ret = 1; |
429168e7 | 244 | |
0f113f3e | 245 | err: |
bfb0641f | 246 | EVP_MD_CTX_free(ctx); |
427e91d9 | 247 | OPENSSL_clear_free(salt, (size_t)sLen); /* salt != NULL implies sLen > 0 */ |
429168e7 | 248 | |
0f113f3e | 249 | return ret; |
429168e7 | 250 | |
0f113f3e | 251 | } |
0491e058 AP |
252 | |
253 | #if defined(_MSC_VER) | |
0f113f3e | 254 | # pragma optimize("",on) |
0491e058 | 255 | #endif |