contrib/libarchive/libarchive/archive_cryptor.c

   1 /*-
   2 * Copyright (c) 2014 Michihiro NAKAJIMA
   3 * All rights reserved.
   4 *
   5 * Redistribution and use in source and binary forms, with or without
   6 * modification, are permitted provided that the following conditions
   7 * are met:
   8 * 1. Redistributions of source code must retain the above copyright
   9 *    notice, this list of conditions and the following disclaimer.
  10 * 2. Redistributions in binary form must reproduce the above copyright
  11 *    notice, this list of conditions and the following disclaimer in the
  12 *    documentation and/or other materials provided with the distribution.
  13 *
  14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24 */
  25
  26 #include "archive_platform.h"
  27
  28 #ifdef HAVE_STRING_H
  29 #include <string.h>
  30 #endif
  31 #include "archive.h"
  32 #include "archive_cryptor_private.h"
  33
  34 /*
  35  * On systems that do not support any recognized crypto libraries,
  36  * this file will normally define no usable symbols.
  37  *
  38  * But some compilers and linkers choke on empty object files, so
  39  * define a public symbol that will always exist.  This could
  40  * be removed someday if this file gains another always-present
  41  * symbol definition.
  42  */
  43 int __libarchive_cryptor_build_hack(void) {
  44         return 0;
  45 }
  46
  47 #ifdef ARCHIVE_CRYPTOR_USE_Apple_CommonCrypto
  48
  49 static int
  50 pbkdf2_sha1(const char *pw, size_t pw_len, const uint8_t *salt,
  51     size_t salt_len, unsigned rounds, uint8_t *derived_key,
  52     size_t derived_key_len)
  53 {
  54         CCKeyDerivationPBKDF(kCCPBKDF2, (const char *)pw,
  55             pw_len, salt, salt_len, kCCPRFHmacAlgSHA1, rounds,
  56             derived_key, derived_key_len);
  57         return 0;
  58 }
  59
  60 #elif defined(_WIN32) && !defined(__CYGWIN__) && defined(HAVE_BCRYPT_H)
  61 #ifdef _MSC_VER
  62 #pragma comment(lib, "Bcrypt.lib")
  63 #endif
  64
  65 static int
  66 pbkdf2_sha1(const char *pw, size_t pw_len, const uint8_t *salt,
  67         size_t salt_len, unsigned rounds, uint8_t *derived_key,
  68         size_t derived_key_len)
  69 {
  70         NTSTATUS status;
  71         BCRYPT_ALG_HANDLE hAlg;
  72
  73         status = BCryptOpenAlgorithmProvider(&hAlg, BCRYPT_SHA1_ALGORITHM,
  74                 MS_PRIMITIVE_PROVIDER, BCRYPT_ALG_HANDLE_HMAC_FLAG);
  75         if (!BCRYPT_SUCCESS(status))
  76                 return -1;
  77
  78         status = BCryptDeriveKeyPBKDF2(hAlg,
  79                 (PUCHAR)(uintptr_t)pw, (ULONG)pw_len,
  80                 (PUCHAR)(uintptr_t)salt, (ULONG)salt_len, rounds,
  81                 (PUCHAR)derived_key, (ULONG)derived_key_len, 0);
  82
  83         BCryptCloseAlgorithmProvider(hAlg, 0);
  84
  85         return (BCRYPT_SUCCESS(status)) ? 0: -1;
  86 }
  87
  88 #elif defined(HAVE_LIBNETTLE) && defined(HAVE_NETTLE_PBKDF2_H)
  89
  90 static int
  91 pbkdf2_sha1(const char *pw, size_t pw_len, const uint8_t *salt,
  92     size_t salt_len, unsigned rounds, uint8_t *derived_key,
  93     size_t derived_key_len) {
  94         pbkdf2_hmac_sha1((unsigned)pw_len, (const uint8_t *)pw, rounds,
  95             salt_len, salt, derived_key_len, derived_key);
  96         return 0;
  97 }
  98
  99 #elif defined(HAVE_LIBCRYPTO) && defined(HAVE_PKCS5_PBKDF2_HMAC_SHA1)
 100
 101 static int
 102 pbkdf2_sha1(const char *pw, size_t pw_len, const uint8_t *salt,
 103     size_t salt_len, unsigned rounds, uint8_t *derived_key,
 104     size_t derived_key_len) {
 105
 106         PKCS5_PBKDF2_HMAC_SHA1(pw, pw_len, salt, salt_len, rounds,
 107             derived_key_len, derived_key);
 108         return 0;
 109 }
 110
 111 #else
 112
 113 /* Stub */
 114 static int
 115 pbkdf2_sha1(const char *pw, size_t pw_len, const uint8_t *salt,
 116     size_t salt_len, unsigned rounds, uint8_t *derived_key,
 117     size_t derived_key_len) {
 118         (void)pw; /* UNUSED */
 119         (void)pw_len; /* UNUSED */
 120         (void)salt; /* UNUSED */
 121         (void)salt_len; /* UNUSED */
 122         (void)rounds; /* UNUSED */
 123         (void)derived_key; /* UNUSED */
 124         (void)derived_key_len; /* UNUSED */
 125         return -1; /* UNSUPPORTED */
 126 }
 127
 128 #endif
 129
 130 #ifdef ARCHIVE_CRYPTOR_USE_Apple_CommonCrypto
 131 # if MAC_OS_X_VERSION_MAX_ALLOWED < 1090
 132 #  define kCCAlgorithmAES kCCAlgorithmAES128
 133 # endif
 134
 135 static int
 136 aes_ctr_init(archive_crypto_ctx *ctx, const uint8_t *key, size_t key_len)
 137 {
 138         CCCryptorStatus r;
 139
 140         ctx->key_len = key_len;
 141         memcpy(ctx->key, key, key_len);
 142         memset(ctx->nonce, 0, sizeof(ctx->nonce));
 143         ctx->encr_pos = AES_BLOCK_SIZE;
 144         r = CCCryptorCreateWithMode(kCCEncrypt, kCCModeECB, kCCAlgorithmAES,
 145             ccNoPadding, NULL, key, key_len, NULL, 0, 0, 0, &ctx->ctx);
 146         return (r == kCCSuccess)? 0: -1;
 147 }
 148
 149 static int
 150 aes_ctr_encrypt_counter(archive_crypto_ctx *ctx)
 151 {
 152         CCCryptorRef ref = ctx->ctx;
 153         CCCryptorStatus r;
 154
 155         r = CCCryptorReset(ref, NULL);
 156         if (r != kCCSuccess)
 157                 return -1;
 158         r = CCCryptorUpdate(ref, ctx->nonce, AES_BLOCK_SIZE, ctx->encr_buf,
 159             AES_BLOCK_SIZE, NULL);
 160         return (r == kCCSuccess)? 0: -1;
 161 }
 162
 163 static int
 164 aes_ctr_release(archive_crypto_ctx *ctx)
 165 {
 166         memset(ctx->key, 0, ctx->key_len);
 167         memset(ctx->nonce, 0, sizeof(ctx->nonce));
 168         return 0;
 169 }
 170
 171 #elif defined(_WIN32) && !defined(__CYGWIN__) && defined(HAVE_BCRYPT_H)
 172
 173 static int
 174 aes_ctr_init(archive_crypto_ctx *ctx, const uint8_t *key, size_t key_len)
 175 {
 176         BCRYPT_ALG_HANDLE hAlg;
 177         BCRYPT_KEY_HANDLE hKey;
 178         DWORD keyObj_len, aes_key_len;
 179         PBYTE keyObj;
 180         ULONG result;
 181         NTSTATUS status;
 182         BCRYPT_KEY_LENGTHS_STRUCT key_lengths;
 183
 184         ctx->hAlg = NULL;
 185         ctx->hKey = NULL;
 186         ctx->keyObj = NULL;
 187         switch (key_len) {
 188         case 16: aes_key_len = 128; break;
 189         case 24: aes_key_len = 192; break;
 190         case 32: aes_key_len = 256; break;
 191         default: return -1;
 192         }
 193         status = BCryptOpenAlgorithmProvider(&hAlg, BCRYPT_AES_ALGORITHM,
 194                 MS_PRIMITIVE_PROVIDER, 0);
 195         if (!BCRYPT_SUCCESS(status))
 196                 return -1;
 197         status = BCryptGetProperty(hAlg, BCRYPT_KEY_LENGTHS, (PUCHAR)&key_lengths,
 198                 sizeof(key_lengths), &result, 0);
 199         if (!BCRYPT_SUCCESS(status)) {
 200                 BCryptCloseAlgorithmProvider(hAlg, 0);
 201                 return -1;
 202         }
 203         if (key_lengths.dwMinLength > aes_key_len
 204                 || key_lengths.dwMaxLength < aes_key_len) {
 205                 BCryptCloseAlgorithmProvider(hAlg, 0);
 206                 return -1;
 207         }
 208         status = BCryptGetProperty(hAlg, BCRYPT_OBJECT_LENGTH, (PUCHAR)&keyObj_len,
 209                 sizeof(keyObj_len), &result, 0);
 210         if (!BCRYPT_SUCCESS(status)) {
 211                 BCryptCloseAlgorithmProvider(hAlg, 0);
 212                 return -1;
 213         }
 214         keyObj = (PBYTE)HeapAlloc(GetProcessHeap(), 0, keyObj_len);
 215         if (keyObj == NULL) {
 216                 BCryptCloseAlgorithmProvider(hAlg, 0);
 217                 return -1;
 218         }
 219         status = BCryptSetProperty(hAlg, BCRYPT_CHAINING_MODE,
 220                 (PUCHAR)BCRYPT_CHAIN_MODE_ECB, sizeof(BCRYPT_CHAIN_MODE_ECB), 0);
 221         if (!BCRYPT_SUCCESS(status)) {
 222                 BCryptCloseAlgorithmProvider(hAlg, 0);
 223                 HeapFree(GetProcessHeap(), 0, keyObj);
 224                 return -1;
 225         }
 226         status = BCryptGenerateSymmetricKey(hAlg, &hKey,
 227                 keyObj, keyObj_len,
 228                 (PUCHAR)(uintptr_t)key, (ULONG)key_len, 0);
 229         if (!BCRYPT_SUCCESS(status)) {
 230                 BCryptCloseAlgorithmProvider(hAlg, 0);
 231                 HeapFree(GetProcessHeap(), 0, keyObj);
 232                 return -1;
 233         }
 234
 235         ctx->hAlg = hAlg;
 236         ctx->hKey = hKey;
 237         ctx->keyObj = keyObj;
 238         ctx->keyObj_len = keyObj_len;
 239         ctx->encr_pos = AES_BLOCK_SIZE;
 240
 241         return 0;
 242 }
 243
 244 static int
 245 aes_ctr_encrypt_counter(archive_crypto_ctx *ctx)
 246 {
 247         NTSTATUS status;
 248         ULONG result;
 249
 250         status = BCryptEncrypt(ctx->hKey, (PUCHAR)ctx->nonce, AES_BLOCK_SIZE,
 251                 NULL, NULL, 0, (PUCHAR)ctx->encr_buf, AES_BLOCK_SIZE,
 252                 &result, 0);
 253         return BCRYPT_SUCCESS(status) ? 0 : -1;
 254 }
 255
 256 static int
 257 aes_ctr_release(archive_crypto_ctx *ctx)
 258 {
 259
 260         if (ctx->hAlg != NULL) {
 261                 BCryptCloseAlgorithmProvider(ctx->hAlg, 0);
 262                 ctx->hAlg = NULL;
 263                 BCryptDestroyKey(ctx->hKey);
 264                 ctx->hKey = NULL;
 265                 HeapFree(GetProcessHeap(), 0, ctx->keyObj);
 266                 ctx->keyObj = NULL;
 267         }
 268         memset(ctx, 0, sizeof(*ctx));
 269         return 0;
 270 }
 271
 272 #elif defined(HAVE_LIBNETTLE) && defined(HAVE_NETTLE_AES_H)
 273
 274 static int
 275 aes_ctr_init(archive_crypto_ctx *ctx, const uint8_t *key, size_t key_len)
 276 {
 277         ctx->key_len = key_len;
 278         memcpy(ctx->key, key, key_len);
 279         memset(ctx->nonce, 0, sizeof(ctx->nonce));
 280         ctx->encr_pos = AES_BLOCK_SIZE;
 281         memset(&ctx->ctx, 0, sizeof(ctx->ctx));
 282         return 0;
 283 }
 284
 285 static int
 286 aes_ctr_encrypt_counter(archive_crypto_ctx *ctx)
 287 {
 288         aes_set_encrypt_key(&ctx->ctx, ctx->key_len, ctx->key);
 289         aes_encrypt(&ctx->ctx, AES_BLOCK_SIZE, ctx->encr_buf, ctx->nonce);
 290         return 0;
 291 }
 292
 293 static int
 294 aes_ctr_release(archive_crypto_ctx *ctx)
 295 {
 296         memset(ctx, 0, sizeof(*ctx));
 297         return 0;
 298 }
 299
 300 #elif defined(HAVE_LIBCRYPTO)
 301
 302 static int
 303 aes_ctr_init(archive_crypto_ctx *ctx, const uint8_t *key, size_t key_len)
 304 {
 305
 306         switch (key_len) {
 307         case 16: ctx->type = EVP_aes_128_ecb(); break;
 308         case 24: ctx->type = EVP_aes_192_ecb(); break;
 309         case 32: ctx->type = EVP_aes_256_ecb(); break;
 310         default: ctx->type = NULL; return -1;
 311         }
 312
 313         ctx->key_len = key_len;
 314         memcpy(ctx->key, key, key_len);
 315         memset(ctx->nonce, 0, sizeof(ctx->nonce));
 316         ctx->encr_pos = AES_BLOCK_SIZE;
 317         EVP_CIPHER_CTX_init(&ctx->ctx);
 318         return 0;
 319 }
 320
 321 static int
 322 aes_ctr_encrypt_counter(archive_crypto_ctx *ctx)
 323 {
 324         int outl = 0;
 325         int r;
 326
 327         r = EVP_EncryptInit_ex(&ctx->ctx, ctx->type, NULL, ctx->key, NULL);
 328         if (r == 0)
 329                 return -1;
 330         r = EVP_EncryptUpdate(&ctx->ctx, ctx->encr_buf, &outl, ctx->nonce,
 331             AES_BLOCK_SIZE);
 332         if (r == 0 || outl != AES_BLOCK_SIZE)
 333                 return -1;
 334         return 0;
 335 }
 336
 337 static int
 338 aes_ctr_release(archive_crypto_ctx *ctx)
 339 {
 340         EVP_CIPHER_CTX_cleanup(&ctx->ctx);
 341         memset(ctx->key, 0, ctx->key_len);
 342         memset(ctx->nonce, 0, sizeof(ctx->nonce));
 343         return 0;
 344 }
 345
 346 #else
 347
 348 #define ARCHIVE_CRYPTOR_STUB
 349 /* Stub */
 350 static int
 351 aes_ctr_init(archive_crypto_ctx *ctx, const uint8_t *key, size_t key_len)
 352 {
 353         (void)ctx; /* UNUSED */
 354         (void)key; /* UNUSED */
 355         (void)key_len; /* UNUSED */
 356         return -1;
 357 }
 358
 359 static int
 360 aes_ctr_encrypt_counter(archive_crypto_ctx *ctx)
 361 {
 362         (void)ctx; /* UNUSED */
 363         return -1;
 364 }
 365
 366 static int
 367 aes_ctr_release(archive_crypto_ctx *ctx)
 368 {
 369         (void)ctx; /* UNUSED */
 370         return 0;
 371 }
 372
 373 #endif
 374
 375 #ifdef ARCHIVE_CRYPTOR_STUB
 376 static int
 377 aes_ctr_update(archive_crypto_ctx *ctx, const uint8_t * const in,
 378     size_t in_len, uint8_t * const out, size_t *out_len)
 379 {
 380         (void)ctx; /* UNUSED */
 381         (void)in; /* UNUSED */
 382         (void)in_len; /* UNUSED */
 383         (void)out; /* UNUSED */
 384         (void)out_len; /* UNUSED */
 385         aes_ctr_encrypt_counter(ctx); /* UNUSED */ /* Fix unused function warning */
 386         return -1;
 387 }
 388
 389 #else
 390 static void
 391 aes_ctr_increase_counter(archive_crypto_ctx *ctx)
 392 {
 393         uint8_t *const nonce = ctx->nonce;
 394         int j;
 395
 396         for (j = 0; j < 8; j++) {
 397                 if (++nonce[j])
 398                         break;
 399         }
 400 }
 401
 402 static int
 403 aes_ctr_update(archive_crypto_ctx *ctx, const uint8_t * const in,
 404     size_t in_len, uint8_t * const out, size_t *out_len)
 405 {
 406         uint8_t *const ebuf = ctx->encr_buf;
 407         unsigned pos = ctx->encr_pos;
 408         unsigned max = (unsigned)((in_len < *out_len)? in_len: *out_len);
 409         unsigned i;
 410
 411         for (i = 0; i < max; ) {
 412                 if (pos == AES_BLOCK_SIZE) {
 413                         aes_ctr_increase_counter(ctx);
 414                         if (aes_ctr_encrypt_counter(ctx) != 0)
 415                                 return -1;
 416                         while (max -i >= AES_BLOCK_SIZE) {
 417                                 for (pos = 0; pos < AES_BLOCK_SIZE; pos++)
 418                                         out[i+pos] = in[i+pos] ^ ebuf[pos];
 419                                 i += AES_BLOCK_SIZE;
 420                                 aes_ctr_increase_counter(ctx);
 421                                 if (aes_ctr_encrypt_counter(ctx) != 0)
 422                                         return -1;
 423                         }
 424                         pos = 0;
 425                         if (i >= max)
 426                                 break;
 427                 }
 428                 out[i] = in[i] ^ ebuf[pos++];
 429                 i++;
 430         }
 431         ctx->encr_pos = pos;
 432         *out_len = i;
 433
 434         return 0;
 435 }
 436 #endif /* ARCHIVE_CRYPTOR_STUB */
 437
 438
 439 const struct archive_cryptor __archive_cryptor =
 440 {
 441   &pbkdf2_sha1,
 442   &aes_ctr_init,
 443   &aes_ctr_update,
 444   &aes_ctr_release,
 445   &aes_ctr_init,
 446   &aes_ctr_update,
 447   &aes_ctr_release,
 448 };