Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* rsa_pss.c */ |
| 2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| 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 | |
| 67 | static const unsigned char zeroes[] = {0,0,0,0,0,0,0,0}; |
| 68 | |
| 69 | #if defined(_MSC_VER) && defined(_ARM_) |
| 70 | #pragma optimize("g", off) |
| 71 | #endif |
| 72 | |
| 73 | int RSA_verify_PKCS1_PSS(RSA *rsa, const unsigned char *mHash, |
| 74 | const EVP_MD *Hash, const unsigned char *EM, int sLen) |
| 75 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 76 | int i; |
| 77 | int ret = 0; |
| 78 | int hLen, maskedDBLen, MSBits, emLen; |
| 79 | const unsigned char *H; |
| 80 | unsigned char *DB = NULL; |
| 81 | EVP_MD_CTX ctx; |
| 82 | unsigned char H_[EVP_MAX_MD_SIZE]; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 83 | |
| 84 | hLen = EVP_MD_size(Hash); |
| 85 | if (hLen < 0) |
| 86 | goto err; |
| 87 | /* |
| 88 | * Negative sLen has special meanings: |
| 89 | * -1 sLen == hLen |
| 90 | * -2 salt length is autorecovered from signature |
| 91 | * -N reserved |
| 92 | */ |
| 93 | if (sLen == -1) sLen = hLen; |
| 94 | else if (sLen == -2) sLen = -2; |
| 95 | else if (sLen < -2) |
| 96 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 97 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 98 | goto err; |
| 99 | } |
| 100 | |
| 101 | MSBits = (BN_num_bits(rsa->n) - 1) & 0x7; |
| 102 | emLen = RSA_size(rsa); |
| 103 | if (EM[0] & (0xFF << MSBits)) |
| 104 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 105 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_FIRST_OCTET_INVALID); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 106 | goto err; |
| 107 | } |
| 108 | if (MSBits == 0) |
| 109 | { |
| 110 | EM++; |
| 111 | emLen--; |
| 112 | } |
| 113 | if (emLen < (hLen + sLen + 2)) /* sLen can be small negative */ |
| 114 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 115 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_DATA_TOO_LARGE); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 116 | goto err; |
| 117 | } |
| 118 | if (EM[emLen - 1] != 0xbc) |
| 119 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 120 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_LAST_OCTET_INVALID); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 121 | goto err; |
| 122 | } |
| 123 | maskedDBLen = emLen - hLen - 1; |
| 124 | H = EM + maskedDBLen; |
| 125 | DB = OPENSSL_malloc(maskedDBLen); |
| 126 | if (!DB) |
| 127 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 128 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, ERR_R_MALLOC_FAILURE); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 129 | goto err; |
| 130 | } |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 131 | if (PKCS1_MGF1(DB, maskedDBLen, H, hLen, Hash) < 0) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 132 | goto err; |
| 133 | for (i = 0; i < maskedDBLen; i++) |
| 134 | DB[i] ^= EM[i]; |
| 135 | if (MSBits) |
| 136 | DB[0] &= 0xFF >> (8 - MSBits); |
| 137 | for (i = 0; DB[i] == 0 && i < (maskedDBLen-1); i++) ; |
| 138 | if (DB[i++] != 0x1) |
| 139 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 140 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_SLEN_RECOVERY_FAILED); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 141 | goto err; |
| 142 | } |
| 143 | if (sLen >= 0 && (maskedDBLen - i) != sLen) |
| 144 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 145 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 146 | goto err; |
| 147 | } |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 148 | EVP_MD_CTX_init(&ctx); |
| 149 | EVP_DigestInit_ex(&ctx, Hash, NULL); |
| 150 | EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes); |
| 151 | EVP_DigestUpdate(&ctx, mHash, hLen); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 152 | if (maskedDBLen - i) |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 153 | EVP_DigestUpdate(&ctx, DB + i, maskedDBLen - i); |
| 154 | EVP_DigestFinal(&ctx, H_, NULL); |
| 155 | EVP_MD_CTX_cleanup(&ctx); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 156 | if (memcmp(H_, H, hLen)) |
| 157 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 158 | RSAerr(RSA_F_RSA_VERIFY_PKCS1_PSS, RSA_R_BAD_SIGNATURE); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 159 | ret = 0; |
| 160 | } |
| 161 | else |
| 162 | ret = 1; |
| 163 | |
| 164 | err: |
| 165 | if (DB) |
| 166 | OPENSSL_free(DB); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 167 | |
| 168 | return ret; |
| 169 | |
| 170 | } |
| 171 | |
| 172 | int RSA_padding_add_PKCS1_PSS(RSA *rsa, unsigned char *EM, |
| 173 | const unsigned char *mHash, |
| 174 | const EVP_MD *Hash, int sLen) |
| 175 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 176 | int i; |
| 177 | int ret = 0; |
| 178 | int hLen, maskedDBLen, MSBits, emLen; |
| 179 | unsigned char *H, *salt = NULL, *p; |
| 180 | EVP_MD_CTX ctx; |
| 181 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 182 | hLen = EVP_MD_size(Hash); |
| 183 | if (hLen < 0) |
| 184 | goto err; |
| 185 | /* |
| 186 | * Negative sLen has special meanings: |
| 187 | * -1 sLen == hLen |
| 188 | * -2 salt length is maximized |
| 189 | * -N reserved |
| 190 | */ |
| 191 | if (sLen == -1) sLen = hLen; |
| 192 | else if (sLen == -2) sLen = -2; |
| 193 | else if (sLen < -2) |
| 194 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 195 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS, RSA_R_SLEN_CHECK_FAILED); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 196 | goto err; |
| 197 | } |
| 198 | |
| 199 | MSBits = (BN_num_bits(rsa->n) - 1) & 0x7; |
| 200 | emLen = RSA_size(rsa); |
| 201 | if (MSBits == 0) |
| 202 | { |
| 203 | *EM++ = 0; |
| 204 | emLen--; |
| 205 | } |
| 206 | if (sLen == -2) |
| 207 | { |
| 208 | sLen = emLen - hLen - 2; |
| 209 | } |
| 210 | else if (emLen < (hLen + sLen + 2)) |
| 211 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 212 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS, |
| 213 | RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 214 | goto err; |
| 215 | } |
| 216 | if (sLen > 0) |
| 217 | { |
| 218 | salt = OPENSSL_malloc(sLen); |
| 219 | if (!salt) |
| 220 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 221 | RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_PSS, |
| 222 | ERR_R_MALLOC_FAILURE); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 223 | goto err; |
| 224 | } |
| 225 | if (RAND_bytes(salt, sLen) <= 0) |
| 226 | goto err; |
| 227 | } |
| 228 | maskedDBLen = emLen - hLen - 1; |
| 229 | H = EM + maskedDBLen; |
| 230 | EVP_MD_CTX_init(&ctx); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 231 | EVP_DigestInit_ex(&ctx, Hash, NULL); |
| 232 | EVP_DigestUpdate(&ctx, zeroes, sizeof zeroes); |
| 233 | EVP_DigestUpdate(&ctx, mHash, hLen); |
| 234 | if (sLen) |
| 235 | EVP_DigestUpdate(&ctx, salt, sLen); |
| 236 | EVP_DigestFinal(&ctx, H, NULL); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 237 | EVP_MD_CTX_cleanup(&ctx); |
| 238 | |
| 239 | /* Generate dbMask in place then perform XOR on it */ |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 240 | if (PKCS1_MGF1(EM, maskedDBLen, H, hLen, Hash)) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 241 | goto err; |
| 242 | |
| 243 | p = EM; |
| 244 | |
| 245 | /* Initial PS XORs with all zeroes which is a NOP so just update |
| 246 | * pointer. Note from a test above this value is guaranteed to |
| 247 | * be non-negative. |
| 248 | */ |
| 249 | p += emLen - sLen - hLen - 2; |
| 250 | *p++ ^= 0x1; |
| 251 | if (sLen > 0) |
| 252 | { |
| 253 | for (i = 0; i < sLen; i++) |
| 254 | *p++ ^= salt[i]; |
| 255 | } |
| 256 | if (MSBits) |
| 257 | EM[0] &= 0xFF >> (8 - MSBits); |
| 258 | |
| 259 | /* H is already in place so just set final 0xbc */ |
| 260 | |
| 261 | EM[emLen - 1] = 0xbc; |
| 262 | |
| 263 | ret = 1; |
| 264 | |
| 265 | err: |
| 266 | if (salt) |
| 267 | OPENSSL_free(salt); |
| 268 | |
| 269 | return ret; |
| 270 | |
| 271 | } |
| 272 | |
| 273 | #if defined(_MSC_VER) |
| 274 | #pragma optimize("",on) |
| 275 | #endif |