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Commit | Line | Data |
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0f113f3e | 1 | /* |
33388b44 | 2 | * Copyright 2005-2020 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 | ||
c5f87134 P |
10 | /* |
11 | * RSA low level APIs are deprecated for public use, but still ok for | |
12 | * internal use. | |
13 | */ | |
14 | #include "internal/deprecated.h" | |
15 | ||
429168e7 | 16 | #include <stdio.h> |
b39fc560 | 17 | #include "internal/cryptlib.h" |
429168e7 DSH |
18 | #include <openssl/bn.h> |
19 | #include <openssl/rsa.h> | |
20 | #include <openssl/evp.h> | |
21 | #include <openssl/rand.h> | |
22 | #include <openssl/sha.h> | |
706457b7 | 23 | #include "rsa_local.h" |
429168e7 | 24 | |
0f113f3e | 25 | static const unsigned char zeroes[] = { 0, 0, 0, 0, 0, 0, 0, 0 }; |
429168e7 | 26 | |
0491e058 | 27 | #if defined(_MSC_VER) && defined(_ARM_) |
0f113f3e | 28 | # pragma optimize("g", off) |
0491e058 AP |
29 | #endif |
30 | ||
429168e7 | 31 | int RSA_verify_PKCS1_PSS(RSA *rsa, const unsigned char *mHash, |
0f113f3e MC |
32 | const EVP_MD *Hash, const unsigned char *EM, |
33 | int sLen) | |
34 | { | |
35 | return RSA_verify_PKCS1_PSS_mgf1(rsa, mHash, Hash, NULL, EM, sLen); | |
36 | } | |
e8254d40 DSH |
37 | |
38 | int RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const unsigned char *mHash, | |
0f113f3e MC |
39 | const EVP_MD *Hash, const EVP_MD *mgf1Hash, |
40 | const unsigned char *EM, int sLen) | |
41 | { | |
42 | int i; | |
43 | int ret = 0; | |
44 | int hLen, maskedDBLen, MSBits, emLen; | |
45 | const unsigned char *H; | |
46 | unsigned char *DB = NULL; | |
bfb0641f | 47 | EVP_MD_CTX *ctx = EVP_MD_CTX_new(); |
0f113f3e | 48 | unsigned char H_[EVP_MAX_MD_SIZE]; |
6e59a892 | 49 | |
6e59a892 RL |
50 | if (ctx == NULL) |
51 | goto err; | |
d51204f1 | 52 | |
0f113f3e MC |
53 | if (mgf1Hash == NULL) |
54 | mgf1Hash = Hash; | |
e8254d40 | 55 | |
6e59a892 | 56 | hLen = EVP_MD_size(Hash); |
0f113f3e MC |
57 | if (hLen < 0) |
58 | goto err; | |
50e735f9 MC |
59 | /*- |
60 | * Negative sLen has special meanings: | |
61 | * -1 sLen == hLen | |
62 | * -2 salt length is autorecovered from signature | |
108909d3 | 63 | * -3 salt length is maximized |
50e735f9 MC |
64 | * -N reserved |
65 | */ | |
90862ab4 | 66 | if (sLen == RSA_PSS_SALTLEN_DIGEST) { |
0f113f3e | 67 | sLen = hLen; |
90862ab4 | 68 | } else if (sLen < RSA_PSS_SALTLEN_MAX) { |
0f113f3e MC |
69 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED); |
70 | goto err; | |
71 | } | |
d51204f1 | 72 | |
0f113f3e MC |
73 | MSBits = (BN_num_bits(rsa->n) - 1) & 0x7; |
74 | emLen = RSA_size(rsa); | |
75 | if (EM[0] & (0xFF << MSBits)) { | |
76 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_FIRST_OCTET_INVALID); | |
77 | goto err; | |
78 | } | |
79 | if (MSBits == 0) { | |
80 | EM++; | |
81 | emLen--; | |
82 | } | |
108909d3 BE |
83 | if (emLen < hLen + 2) { |
84 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_DATA_TOO_LARGE); | |
85 | goto err; | |
86 | } | |
137096a7 DSH |
87 | if (sLen == RSA_PSS_SALTLEN_MAX) { |
88 | sLen = emLen - hLen - 2; | |
108909d3 | 89 | } else if (sLen > emLen - hLen - 2) { /* sLen can be small negative */ |
0f113f3e MC |
90 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_DATA_TOO_LARGE); |
91 | goto err; | |
92 | } | |
93 | if (EM[emLen - 1] != 0xbc) { | |
94 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_LAST_OCTET_INVALID); | |
95 | goto err; | |
96 | } | |
97 | maskedDBLen = emLen - hLen - 1; | |
98 | H = EM + maskedDBLen; | |
99 | DB = OPENSSL_malloc(maskedDBLen); | |
90945fa3 | 100 | if (DB == NULL) { |
0f113f3e MC |
101 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, ERR_R_MALLOC_FAILURE); |
102 | goto err; | |
103 | } | |
104 | if (PKCS1_MGF1(DB, maskedDBLen, H, hLen, mgf1Hash) < 0) | |
105 | goto err; | |
106 | for (i = 0; i < maskedDBLen; i++) | |
107 | DB[i] ^= EM[i]; | |
108 | if (MSBits) | |
109 | DB[0] &= 0xFF >> (8 - MSBits); | |
110 | for (i = 0; DB[i] == 0 && i < (maskedDBLen - 1); i++) ; | |
111 | if (DB[i++] != 0x1) { | |
112 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_RECOVERY_FAILED); | |
113 | goto err; | |
114 | } | |
137096a7 | 115 | if (sLen != RSA_PSS_SALTLEN_AUTO && (maskedDBLen - i) != sLen) { |
0f113f3e MC |
116 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED); |
117 | goto err; | |
118 | } | |
6e59a892 | 119 | if (!EVP_DigestInit_ex(ctx, Hash, NULL) |
cbe29648 | 120 | || !EVP_DigestUpdate(ctx, zeroes, sizeof(zeroes)) |
6e59a892 | 121 | || !EVP_DigestUpdate(ctx, mHash, hLen)) |
0f113f3e MC |
122 | goto err; |
123 | if (maskedDBLen - i) { | |
6e59a892 | 124 | if (!EVP_DigestUpdate(ctx, DB + i, maskedDBLen - i)) |
0f113f3e MC |
125 | goto err; |
126 | } | |
6e59a892 | 127 | if (!EVP_DigestFinal_ex(ctx, H_, NULL)) |
0f113f3e MC |
128 | goto err; |
129 | if (memcmp(H_, H, hLen)) { | |
130 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS_MGF1, RSA_R_BAD_SIGNATURE); | |
131 | ret = 0; | |
90862ab4 | 132 | } else { |
0f113f3e | 133 | ret = 1; |
90862ab4 | 134 | } |
429168e7 | 135 | |
0f113f3e | 136 | err: |
b548a1f1 | 137 | OPENSSL_free(DB); |
bfb0641f | 138 | EVP_MD_CTX_free(ctx); |
429168e7 | 139 | |
0f113f3e | 140 | return ret; |
429168e7 | 141 | |
0f113f3e | 142 | } |
429168e7 DSH |
143 | |
144 | int RSA_padding_add_PKCS1_PSS(RSA *rsa, unsigned char *EM, | |
0f113f3e MC |
145 | const unsigned char *mHash, |
146 | const EVP_MD *Hash, int sLen) | |
147 | { | |
148 | return RSA_padding_add_PKCS1_PSS_mgf1(rsa, EM, mHash, Hash, NULL, sLen); | |
149 | } | |
e8254d40 DSH |
150 | |
151 | int RSA_padding_add_PKCS1_PSS_mgf1(RSA *rsa, unsigned char *EM, | |
0f113f3e MC |
152 | const unsigned char *mHash, |
153 | const EVP_MD *Hash, const EVP_MD *mgf1Hash, | |
154 | int sLen) | |
155 | { | |
156 | int i; | |
157 | int ret = 0; | |
158 | int hLen, maskedDBLen, MSBits, emLen; | |
159 | unsigned char *H, *salt = NULL, *p; | |
6e59a892 | 160 | EVP_MD_CTX *ctx = NULL; |
d51204f1 | 161 | |
0f113f3e MC |
162 | if (mgf1Hash == NULL) |
163 | mgf1Hash = Hash; | |
e8254d40 | 164 | |
6e59a892 | 165 | hLen = EVP_MD_size(Hash); |
0f113f3e MC |
166 | if (hLen < 0) |
167 | goto err; | |
50e735f9 MC |
168 | /*- |
169 | * Negative sLen has special meanings: | |
170 | * -1 sLen == hLen | |
171 | * -2 salt length is maximized | |
108909d3 | 172 | * -3 same as above (on signing) |
50e735f9 MC |
173 | * -N reserved |
174 | */ | |
90862ab4 | 175 | if (sLen == RSA_PSS_SALTLEN_DIGEST) { |
0f113f3e | 176 | sLen = hLen; |
90862ab4 | 177 | } else if (sLen == RSA_PSS_SALTLEN_MAX_SIGN) { |
137096a7 | 178 | sLen = RSA_PSS_SALTLEN_MAX; |
90862ab4 | 179 | } else if (sLen < RSA_PSS_SALTLEN_MAX) { |
0f113f3e MC |
180 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, RSA_R_SLEN_CHECK_FAILED); |
181 | goto err; | |
182 | } | |
d51204f1 | 183 | |
0f113f3e MC |
184 | MSBits = (BN_num_bits(rsa->n) - 1) & 0x7; |
185 | emLen = RSA_size(rsa); | |
186 | if (MSBits == 0) { | |
187 | *EM++ = 0; | |
188 | emLen--; | |
189 | } | |
108909d3 BE |
190 | if (emLen < hLen + 2) { |
191 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, | |
192 | RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); | |
193 | goto err; | |
194 | } | |
137096a7 | 195 | if (sLen == RSA_PSS_SALTLEN_MAX) { |
0f113f3e | 196 | sLen = emLen - hLen - 2; |
108909d3 | 197 | } else if (sLen > emLen - hLen - 2) { |
0f113f3e MC |
198 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, |
199 | RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); | |
200 | goto err; | |
201 | } | |
202 | if (sLen > 0) { | |
203 | salt = OPENSSL_malloc(sLen); | |
90945fa3 | 204 | if (salt == NULL) { |
0f113f3e MC |
205 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS_MGF1, |
206 | ERR_R_MALLOC_FAILURE); | |
207 | goto err; | |
208 | } | |
0f2deef5 | 209 | if (RAND_bytes_ex(rsa->libctx, salt, sLen) <= 0) |
0f113f3e MC |
210 | goto err; |
211 | } | |
212 | maskedDBLen = emLen - hLen - 1; | |
213 | H = EM + maskedDBLen; | |
bfb0641f | 214 | ctx = EVP_MD_CTX_new(); |
6e59a892 RL |
215 | if (ctx == NULL) |
216 | goto err; | |
217 | if (!EVP_DigestInit_ex(ctx, Hash, NULL) | |
cbe29648 | 218 | || !EVP_DigestUpdate(ctx, zeroes, sizeof(zeroes)) |
6e59a892 | 219 | || !EVP_DigestUpdate(ctx, mHash, hLen)) |
0f113f3e | 220 | goto err; |
6e59a892 | 221 | if (sLen && !EVP_DigestUpdate(ctx, salt, sLen)) |
0f113f3e | 222 | goto err; |
6e59a892 | 223 | if (!EVP_DigestFinal_ex(ctx, H, NULL)) |
0f113f3e | 224 | goto err; |
429168e7 | 225 | |
0f113f3e MC |
226 | /* Generate dbMask in place then perform XOR on it */ |
227 | if (PKCS1_MGF1(EM, maskedDBLen, H, hLen, mgf1Hash)) | |
228 | goto err; | |
429168e7 | 229 | |
0f113f3e | 230 | p = EM; |
429168e7 | 231 | |
0f113f3e MC |
232 | /* |
233 | * Initial PS XORs with all zeroes which is a NOP so just update pointer. | |
234 | * Note from a test above this value is guaranteed to be non-negative. | |
235 | */ | |
236 | p += emLen - sLen - hLen - 2; | |
237 | *p++ ^= 0x1; | |
238 | if (sLen > 0) { | |
239 | for (i = 0; i < sLen; i++) | |
240 | *p++ ^= salt[i]; | |
241 | } | |
242 | if (MSBits) | |
243 | EM[0] &= 0xFF >> (8 - MSBits); | |
429168e7 | 244 | |
0f113f3e | 245 | /* H is already in place so just set final 0xbc */ |
429168e7 | 246 | |
0f113f3e | 247 | EM[emLen - 1] = 0xbc; |
429168e7 | 248 | |
0f113f3e | 249 | ret = 1; |
429168e7 | 250 | |
0f113f3e | 251 | err: |
bfb0641f | 252 | EVP_MD_CTX_free(ctx); |
427e91d9 | 253 | OPENSSL_clear_free(salt, (size_t)sLen); /* salt != NULL implies sLen > 0 */ |
429168e7 | 254 | |
0f113f3e | 255 | return ret; |
429168e7 | 256 | |
0f113f3e | 257 | } |
0491e058 AP |
258 | |
259 | #if defined(_MSC_VER) | |
0f113f3e | 260 | # pragma optimize("",on) |
0491e058 | 261 | #endif |