Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/aes/aes_wrap.c */ |
| 2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| 3 | * project. |
| 4 | */ |
| 5 | /* ==================================================================== |
| 6 | * Copyright (c) 2008 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 | |
| 54 | #include "cryptlib.h" |
| 55 | #include <openssl/aes.h> |
| 56 | #include <openssl/bio.h> |
| 57 | |
| 58 | static const unsigned char default_iv[] = { |
| 59 | 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, |
| 60 | }; |
| 61 | |
| 62 | int AES_wrap_key(AES_KEY *key, const unsigned char *iv, |
| 63 | unsigned char *out, |
| 64 | const unsigned char *in, unsigned int inlen) |
| 65 | { |
| 66 | unsigned char *A, B[16], *R; |
| 67 | unsigned int i, j, t; |
| 68 | if ((inlen & 0x7) || (inlen < 8)) |
| 69 | return -1; |
| 70 | A = B; |
| 71 | t = 1; |
| 72 | memcpy(out + 8, in, inlen); |
| 73 | if (!iv) |
| 74 | iv = default_iv; |
| 75 | |
| 76 | memcpy(A, iv, 8); |
| 77 | |
| 78 | for (j = 0; j < 6; j++) |
| 79 | { |
| 80 | R = out + 8; |
| 81 | for (i = 0; i < inlen; i += 8, t++, R += 8) |
| 82 | { |
| 83 | memcpy(B + 8, R, 8); |
| 84 | AES_encrypt(B, B, key); |
| 85 | A[7] ^= (unsigned char)(t & 0xff); |
| 86 | if (t > 0xff) |
| 87 | { |
| 88 | A[6] ^= (unsigned char)((t >> 8) & 0xff); |
| 89 | A[5] ^= (unsigned char)((t >> 16) & 0xff); |
| 90 | A[4] ^= (unsigned char)((t >> 24) & 0xff); |
| 91 | } |
| 92 | memcpy(R, B + 8, 8); |
| 93 | } |
| 94 | } |
| 95 | memcpy(out, A, 8); |
| 96 | return inlen + 8; |
| 97 | } |
| 98 | |
| 99 | int AES_unwrap_key(AES_KEY *key, const unsigned char *iv, |
| 100 | unsigned char *out, |
| 101 | const unsigned char *in, unsigned int inlen) |
| 102 | { |
| 103 | unsigned char *A, B[16], *R; |
| 104 | unsigned int i, j, t; |
| 105 | inlen -= 8; |
| 106 | if (inlen & 0x7) |
| 107 | return -1; |
| 108 | if (inlen < 8) |
| 109 | return -1; |
| 110 | A = B; |
| 111 | t = 6 * (inlen >> 3); |
| 112 | memcpy(A, in, 8); |
| 113 | memcpy(out, in + 8, inlen); |
| 114 | for (j = 0; j < 6; j++) |
| 115 | { |
| 116 | R = out + inlen - 8; |
| 117 | for (i = 0; i < inlen; i += 8, t--, R -= 8) |
| 118 | { |
| 119 | A[7] ^= (unsigned char)(t & 0xff); |
| 120 | if (t > 0xff) |
| 121 | { |
| 122 | A[6] ^= (unsigned char)((t >> 8) & 0xff); |
| 123 | A[5] ^= (unsigned char)((t >> 16) & 0xff); |
| 124 | A[4] ^= (unsigned char)((t >> 24) & 0xff); |
| 125 | } |
| 126 | memcpy(B + 8, R, 8); |
| 127 | AES_decrypt(B, B, key); |
| 128 | memcpy(R, B + 8, 8); |
| 129 | } |
| 130 | } |
| 131 | if (!iv) |
| 132 | iv = default_iv; |
| 133 | if (memcmp(A, iv, 8)) |
| 134 | { |
| 135 | OPENSSL_cleanse(out, inlen); |
| 136 | return 0; |
| 137 | } |
| 138 | return inlen; |
| 139 | } |
| 140 | |
| 141 | #ifdef AES_WRAP_TEST |
| 142 | |
| 143 | int AES_wrap_unwrap_test(const unsigned char *kek, int keybits, |
| 144 | const unsigned char *iv, |
| 145 | const unsigned char *eout, |
| 146 | const unsigned char *key, int keylen) |
| 147 | { |
| 148 | unsigned char *otmp = NULL, *ptmp = NULL; |
| 149 | int r, ret = 0; |
| 150 | AES_KEY wctx; |
| 151 | otmp = OPENSSL_malloc(keylen + 8); |
| 152 | ptmp = OPENSSL_malloc(keylen); |
| 153 | if (!otmp || !ptmp) |
| 154 | return 0; |
| 155 | if (AES_set_encrypt_key(kek, keybits, &wctx)) |
| 156 | goto err; |
| 157 | r = AES_wrap_key(&wctx, iv, otmp, key, keylen); |
| 158 | if (r <= 0) |
| 159 | goto err; |
| 160 | |
| 161 | if (eout && memcmp(eout, otmp, keylen)) |
| 162 | goto err; |
| 163 | |
| 164 | if (AES_set_decrypt_key(kek, keybits, &wctx)) |
| 165 | goto err; |
| 166 | r = AES_unwrap_key(&wctx, iv, ptmp, otmp, r); |
| 167 | |
| 168 | if (memcmp(key, ptmp, keylen)) |
| 169 | goto err; |
| 170 | |
| 171 | ret = 1; |
| 172 | |
| 173 | err: |
| 174 | if (otmp) |
| 175 | OPENSSL_free(otmp); |
| 176 | if (ptmp) |
| 177 | OPENSSL_free(ptmp); |
| 178 | |
| 179 | return ret; |
| 180 | |
| 181 | } |
| 182 | |
| 183 | |
| 184 | |
| 185 | int main(int argc, char **argv) |
| 186 | { |
| 187 | |
| 188 | static const unsigned char kek[] = { |
| 189 | 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, |
| 190 | 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, |
| 191 | 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, |
| 192 | 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f |
| 193 | }; |
| 194 | |
| 195 | static const unsigned char key[] = { |
| 196 | 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, |
| 197 | 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, |
| 198 | 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, |
| 199 | 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f |
| 200 | }; |
| 201 | |
| 202 | static const unsigned char e1[] = { |
| 203 | 0x1f, 0xa6, 0x8b, 0x0a, 0x81, 0x12, 0xb4, 0x47, |
| 204 | 0xae, 0xf3, 0x4b, 0xd8, 0xfb, 0x5a, 0x7b, 0x82, |
| 205 | 0x9d, 0x3e, 0x86, 0x23, 0x71, 0xd2, 0xcf, 0xe5 |
| 206 | }; |
| 207 | |
| 208 | static const unsigned char e2[] = { |
| 209 | 0x96, 0x77, 0x8b, 0x25, 0xae, 0x6c, 0xa4, 0x35, |
| 210 | 0xf9, 0x2b, 0x5b, 0x97, 0xc0, 0x50, 0xae, 0xd2, |
| 211 | 0x46, 0x8a, 0xb8, 0xa1, 0x7a, 0xd8, 0x4e, 0x5d |
| 212 | }; |
| 213 | |
| 214 | static const unsigned char e3[] = { |
| 215 | 0x64, 0xe8, 0xc3, 0xf9, 0xce, 0x0f, 0x5b, 0xa2, |
| 216 | 0x63, 0xe9, 0x77, 0x79, 0x05, 0x81, 0x8a, 0x2a, |
| 217 | 0x93, 0xc8, 0x19, 0x1e, 0x7d, 0x6e, 0x8a, 0xe7 |
| 218 | }; |
| 219 | |
| 220 | static const unsigned char e4[] = { |
| 221 | 0x03, 0x1d, 0x33, 0x26, 0x4e, 0x15, 0xd3, 0x32, |
| 222 | 0x68, 0xf2, 0x4e, 0xc2, 0x60, 0x74, 0x3e, 0xdc, |
| 223 | 0xe1, 0xc6, 0xc7, 0xdd, 0xee, 0x72, 0x5a, 0x93, |
| 224 | 0x6b, 0xa8, 0x14, 0x91, 0x5c, 0x67, 0x62, 0xd2 |
| 225 | }; |
| 226 | |
| 227 | static const unsigned char e5[] = { |
| 228 | 0xa8, 0xf9, 0xbc, 0x16, 0x12, 0xc6, 0x8b, 0x3f, |
| 229 | 0xf6, 0xe6, 0xf4, 0xfb, 0xe3, 0x0e, 0x71, 0xe4, |
| 230 | 0x76, 0x9c, 0x8b, 0x80, 0xa3, 0x2c, 0xb8, 0x95, |
| 231 | 0x8c, 0xd5, 0xd1, 0x7d, 0x6b, 0x25, 0x4d, 0xa1 |
| 232 | }; |
| 233 | |
| 234 | static const unsigned char e6[] = { |
| 235 | 0x28, 0xc9, 0xf4, 0x04, 0xc4, 0xb8, 0x10, 0xf4, |
| 236 | 0xcb, 0xcc, 0xb3, 0x5c, 0xfb, 0x87, 0xf8, 0x26, |
| 237 | 0x3f, 0x57, 0x86, 0xe2, 0xd8, 0x0e, 0xd3, 0x26, |
| 238 | 0xcb, 0xc7, 0xf0, 0xe7, 0x1a, 0x99, 0xf4, 0x3b, |
| 239 | 0xfb, 0x98, 0x8b, 0x9b, 0x7a, 0x02, 0xdd, 0x21 |
| 240 | }; |
| 241 | |
| 242 | AES_KEY wctx, xctx; |
| 243 | int ret; |
| 244 | ret = AES_wrap_unwrap_test(kek, 128, NULL, e1, key, 16); |
| 245 | fprintf(stderr, "Key test result %d\n", ret); |
| 246 | ret = AES_wrap_unwrap_test(kek, 192, NULL, e2, key, 16); |
| 247 | fprintf(stderr, "Key test result %d\n", ret); |
| 248 | ret = AES_wrap_unwrap_test(kek, 256, NULL, e3, key, 16); |
| 249 | fprintf(stderr, "Key test result %d\n", ret); |
| 250 | ret = AES_wrap_unwrap_test(kek, 192, NULL, e4, key, 24); |
| 251 | fprintf(stderr, "Key test result %d\n", ret); |
| 252 | ret = AES_wrap_unwrap_test(kek, 256, NULL, e5, key, 24); |
| 253 | fprintf(stderr, "Key test result %d\n", ret); |
| 254 | ret = AES_wrap_unwrap_test(kek, 256, NULL, e6, key, 32); |
| 255 | fprintf(stderr, "Key test result %d\n", ret); |
| 256 | } |
| 257 | |
| 258 | |
| 259 | #endif |