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| 1 /* crypto/cmac/cmac.c */ | |
| 2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL | |
| 3 * project. | |
| 4 */ | |
| 5 /* ==================================================================== | |
| 6 * Copyright (c) 2010 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 <stdio.h> | |
| 55 #include <stdlib.h> | |
| 56 #include <string.h> | |
| 57 #include "cryptlib.h" | |
| 58 #include <openssl/cmac.h> | |
| 59 | |
| 60 #ifdef OPENSSL_FIPS | |
| 61 #include <openssl/fips.h> | |
| 62 #endif | |
| 63 | |
| 64 struct CMAC_CTX_st | |
| 65 { | |
| 66 /* Cipher context to use */ | |
| 67 EVP_CIPHER_CTX cctx; | |
| 68 /* Keys k1 and k2 */ | |
| 69 unsigned char k1[EVP_MAX_BLOCK_LENGTH]; | |
| 70 unsigned char k2[EVP_MAX_BLOCK_LENGTH]; | |
| 71 /* Temporary block */ | |
| 72 unsigned char tbl[EVP_MAX_BLOCK_LENGTH]; | |
| 73 /* Last (possibly partial) block */ | |
| 74 unsigned char last_block[EVP_MAX_BLOCK_LENGTH]; | |
| 75 /* Number of bytes in last block: -1 means context not initialised */ | |
| 76 int nlast_block; | |
| 77 }; | |
| 78 | |
| 79 | |
| 80 /* Make temporary keys K1 and K2 */ | |
| 81 | |
| 82 static void make_kn(unsigned char *k1, unsigned char *l, int bl) | |
| 83 { | |
| 84 int i; | |
| 85 /* Shift block to left, including carry */ | |
| 86 for (i = 0; i < bl; i++) | |
| 87 { | |
| 88 k1[i] = l[i] << 1; | |
| 89 if (i < bl - 1 && l[i + 1] & 0x80) | |
| 90 k1[i] |= 1; | |
| 91 } | |
| 92 /* If MSB set fixup with R */ | |
| 93 if (l[0] & 0x80) | |
| 94 k1[bl - 1] ^= bl == 16 ? 0x87 : 0x1b; | |
| 95 } | |
| 96 | |
| 97 CMAC_CTX *CMAC_CTX_new(void) | |
| 98 { | |
| 99 CMAC_CTX *ctx; | |
| 100 ctx = OPENSSL_malloc(sizeof(CMAC_CTX)); | |
| 101 if (!ctx) | |
| 102 return NULL; | |
| 103 EVP_CIPHER_CTX_init(&ctx->cctx); | |
| 104 ctx->nlast_block = -1; | |
| 105 return ctx; | |
| 106 } | |
| 107 | |
| 108 void CMAC_CTX_cleanup(CMAC_CTX *ctx) | |
| 109 { | |
| 110 #ifdef OPENSSL_FIPS | |
| 111 if (FIPS_mode() && !ctx->cctx.engine) | |
| 112 { | |
| 113 FIPS_cmac_ctx_cleanup(ctx); | |
| 114 return; | |
| 115 } | |
| 116 #endif | |
| 117 EVP_CIPHER_CTX_cleanup(&ctx->cctx); | |
| 118 OPENSSL_cleanse(ctx->tbl, EVP_MAX_BLOCK_LENGTH); | |
| 119 OPENSSL_cleanse(ctx->k1, EVP_MAX_BLOCK_LENGTH); | |
| 120 OPENSSL_cleanse(ctx->k2, EVP_MAX_BLOCK_LENGTH); | |
| 121 OPENSSL_cleanse(ctx->last_block, EVP_MAX_BLOCK_LENGTH); | |
| 122 ctx->nlast_block = -1; | |
| 123 } | |
| 124 | |
| 125 EVP_CIPHER_CTX *CMAC_CTX_get0_cipher_ctx(CMAC_CTX *ctx) | |
| 126 { | |
| 127 return &ctx->cctx; | |
| 128 } | |
| 129 | |
| 130 void CMAC_CTX_free(CMAC_CTX *ctx) | |
| 131 { | |
| 132 CMAC_CTX_cleanup(ctx); | |
| 133 OPENSSL_free(ctx); | |
| 134 } | |
| 135 | |
| 136 int CMAC_CTX_copy(CMAC_CTX *out, const CMAC_CTX *in) | |
| 137 { | |
| 138 int bl; | |
| 139 if (in->nlast_block == -1) | |
| 140 return 0; | |
| 141 if (!EVP_CIPHER_CTX_copy(&out->cctx, &in->cctx)) | |
| 142 return 0; | |
| 143 bl = EVP_CIPHER_CTX_block_size(&in->cctx); | |
| 144 memcpy(out->k1, in->k1, bl); | |
| 145 memcpy(out->k2, in->k2, bl); | |
| 146 memcpy(out->tbl, in->tbl, bl); | |
| 147 memcpy(out->last_block, in->last_block, bl); | |
| 148 out->nlast_block = in->nlast_block; | |
| 149 return 1; | |
| 150 } | |
| 151 | |
| 152 int CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen, | |
| 153 const EVP_CIPHER *cipher, ENGINE *impl) | |
| 154 { | |
| 155 static unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH]; | |
| 156 #ifdef OPENSSL_FIPS | |
| 157 if (FIPS_mode()) | |
| 158 { | |
| 159 /* If we have an ENGINE need to allow non FIPS */ | |
| 160 if ((impl || ctx->cctx.engine) | |
| 161 && !(ctx->cctx.flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)) | |
| 162 | |
| 163 { | |
| 164 EVPerr(EVP_F_CMAC_INIT, EVP_R_DISABLED_FOR_FIPS); | |
| 165 return 0; | |
| 166 } | |
| 167 /* Other algorithm blocking will be done in FIPS_cmac_init, | |
| 168 * via FIPS_cipherinit(). | |
| 169 */ | |
| 170 if (!impl && !ctx->cctx.engine) | |
| 171 return FIPS_cmac_init(ctx, key, keylen, cipher, NULL); | |
| 172 } | |
| 173 #endif | |
| 174 /* All zeros means restart */ | |
| 175 if (!key && !cipher && !impl && keylen == 0) | |
| 176 { | |
| 177 /* Not initialised */ | |
| 178 if (ctx->nlast_block == -1) | |
| 179 return 0; | |
| 180 if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv)) | |
| 181 return 0; | |
| 182 memset(ctx->tbl, 0, EVP_CIPHER_CTX_block_size(&ctx->cctx)); | |
| 183 ctx->nlast_block = 0; | |
| 184 return 1; | |
| 185 } | |
| 186 /* Initialiase context */ | |
| 187 if (cipher && !EVP_EncryptInit_ex(&ctx->cctx, cipher, impl, NULL, NULL)) | |
| 188 return 0; | |
| 189 /* Non-NULL key means initialisation complete */ | |
| 190 if (key) | |
| 191 { | |
| 192 int bl; | |
| 193 if (!EVP_CIPHER_CTX_cipher(&ctx->cctx)) | |
| 194 return 0; | |
| 195 if (!EVP_CIPHER_CTX_set_key_length(&ctx->cctx, keylen)) | |
| 196 return 0; | |
| 197 if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, key, zero_iv)) | |
| 198 return 0; | |
| 199 bl = EVP_CIPHER_CTX_block_size(&ctx->cctx); | |
| 200 if (!EVP_Cipher(&ctx->cctx, ctx->tbl, zero_iv, bl)) | |
| 201 return 0; | |
| 202 make_kn(ctx->k1, ctx->tbl, bl); | |
| 203 make_kn(ctx->k2, ctx->k1, bl); | |
| 204 OPENSSL_cleanse(ctx->tbl, bl); | |
| 205 /* Reset context again ready for first data block */ | |
| 206 if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv)) | |
| 207 return 0; | |
| 208 /* Zero tbl so resume works */ | |
| 209 memset(ctx->tbl, 0, bl); | |
| 210 ctx->nlast_block = 0; | |
| 211 } | |
| 212 return 1; | |
| 213 } | |
| 214 | |
| 215 int CMAC_Update(CMAC_CTX *ctx, const void *in, size_t dlen) | |
| 216 { | |
| 217 const unsigned char *data = in; | |
| 218 size_t bl; | |
| 219 #ifdef OPENSSL_FIPS | |
| 220 if (FIPS_mode() && !ctx->cctx.engine) | |
| 221 return FIPS_cmac_update(ctx, in, dlen); | |
| 222 #endif | |
| 223 if (ctx->nlast_block == -1) | |
| 224 return 0; | |
| 225 if (dlen == 0) | |
| 226 return 1; | |
| 227 bl = EVP_CIPHER_CTX_block_size(&ctx->cctx); | |
| 228 /* Copy into partial block if we need to */ | |
| 229 if (ctx->nlast_block > 0) | |
| 230 { | |
| 231 size_t nleft; | |
| 232 nleft = bl - ctx->nlast_block; | |
| 233 if (dlen < nleft) | |
| 234 nleft = dlen; | |
| 235 memcpy(ctx->last_block + ctx->nlast_block, data, nleft); | |
| 236 dlen -= nleft; | |
| 237 ctx->nlast_block += nleft; | |
| 238 /* If no more to process return */ | |
| 239 if (dlen == 0) | |
| 240 return 1; | |
| 241 data += nleft; | |
| 242 /* Else not final block so encrypt it */ | |
| 243 if (!EVP_Cipher(&ctx->cctx, ctx->tbl, ctx->last_block,bl)) | |
| 244 return 0; | |
| 245 } | |
| 246 /* Encrypt all but one of the complete blocks left */ | |
| 247 while(dlen > bl) | |
| 248 { | |
| 249 if (!EVP_Cipher(&ctx->cctx, ctx->tbl, data, bl)) | |
| 250 return 0; | |
| 251 dlen -= bl; | |
| 252 data += bl; | |
| 253 } | |
| 254 /* Copy any data left to last block buffer */ | |
| 255 memcpy(ctx->last_block, data, dlen); | |
| 256 ctx->nlast_block = dlen; | |
| 257 return 1; | |
| 258 | |
| 259 } | |
| 260 | |
| 261 int CMAC_Final(CMAC_CTX *ctx, unsigned char *out, size_t *poutlen) | |
| 262 { | |
| 263 int i, bl, lb; | |
| 264 #ifdef OPENSSL_FIPS | |
| 265 if (FIPS_mode() && !ctx->cctx.engine) | |
| 266 return FIPS_cmac_final(ctx, out, poutlen); | |
| 267 #endif | |
| 268 if (ctx->nlast_block == -1) | |
| 269 return 0; | |
| 270 bl = EVP_CIPHER_CTX_block_size(&ctx->cctx); | |
| 271 *poutlen = (size_t)bl; | |
| 272 if (!out) | |
| 273 return 1; | |
| 274 lb = ctx->nlast_block; | |
| 275 /* Is last block complete? */ | |
| 276 if (lb == bl) | |
| 277 { | |
| 278 for (i = 0; i < bl; i++) | |
| 279 out[i] = ctx->last_block[i] ^ ctx->k1[i]; | |
| 280 } | |
| 281 else | |
| 282 { | |
| 283 ctx->last_block[lb] = 0x80; | |
| 284 if (bl - lb > 1) | |
| 285 memset(ctx->last_block + lb + 1, 0, bl - lb - 1); | |
| 286 for (i = 0; i < bl; i++) | |
| 287 out[i] = ctx->last_block[i] ^ ctx->k2[i]; | |
| 288 } | |
| 289 if (!EVP_Cipher(&ctx->cctx, out, out, bl)) | |
| 290 { | |
| 291 OPENSSL_cleanse(out, bl); | |
| 292 return 0; | |
| 293 } | |
| 294 return 1; | |
| 295 } | |
| 296 | |
| 297 int CMAC_resume(CMAC_CTX *ctx) | |
| 298 { | |
| 299 if (ctx->nlast_block == -1) | |
| 300 return 0; | |
| 301 /* The buffer "tbl" containes the last fully encrypted block | |
| 302 * which is the last IV (or all zeroes if no last encrypted block). | |
| 303 * The last block has not been modified since CMAC_final(). | |
| 304 * So reinitliasing using the last decrypted block will allow | |
| 305 * CMAC to continue after calling CMAC_Final(). | |
| 306 */ | |
| 307 return EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, ctx->tbl); | |
| 308 } | |
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Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master