engines/e_padlock.c

   1 /*-
   2  * Support for VIA PadLock Advanced Cryptography Engine (ACE)
   3  * Written by Michal Ludvig <michal@logix.cz>
   4  *            http://www.logix.cz/michal
   5  *
   6  * Big thanks to Andy Polyakov for a help with optimization,
   7  * assembler fixes, port to MS Windows and a lot of other
   8  * valuable work on this engine!
   9  */
  10
  11 /* ====================================================================
  12  * Copyright (c) 1999-2001 The OpenSSL Project.  All rights reserved.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  *
  18  * 1. Redistributions of source code must retain the above copyright
  19  *    notice, this list of conditions and the following disclaimer.
  20  *
  21  * 2. Redistributions in binary form must reproduce the above copyright
  22  *    notice, this list of conditions and the following disclaimer in
  23  *    the documentation and/or other materials provided with the
  24  *    distribution.
  25  *
  26  * 3. All advertising materials mentioning features or use of this
  27  *    software must display the following acknowledgment:
  28  *    "This product includes software developed by the OpenSSL Project
  29  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  30  *
  31  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  32  *    endorse or promote products derived from this software without
  33  *    prior written permission. For written permission, please contact
  34  *    licensing@OpenSSL.org.
  35  *
  36  * 5. Products derived from this software may not be called "OpenSSL"
  37  *    nor may "OpenSSL" appear in their names without prior written
  38  *    permission of the OpenSSL Project.
  39  *
  40  * 6. Redistributions of any form whatsoever must retain the following
  41  *    acknowledgment:
  42  *    "This product includes software developed by the OpenSSL Project
  43  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  46  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  48  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  49  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  50  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  51  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  52  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  54  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  55  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  56  * OF THE POSSIBILITY OF SUCH DAMAGE.
  57  * ====================================================================
  58  *
  59  * This product includes cryptographic software written by Eric Young
  60  * (eay@cryptsoft.com).  This product includes software written by Tim
  61  * Hudson (tjh@cryptsoft.com).
  62  *
  63  */
  64
  65 #include <stdio.h>
  66 #include <string.h>
  67
  68 #include <openssl/opensslconf.h>
  69 #include <openssl/crypto.h>
  70 #include <openssl/dso.h>
  71 #include <openssl/engine.h>
  72 #include <openssl/evp.h>
  73 #ifndef OPENSSL_NO_AES
  74 # include <openssl/aes.h>
  75 #endif
  76 #include <openssl/rand.h>
  77 #include <openssl/err.h>
  78 #include <openssl/modes.h>
  79
  80 #ifndef OPENSSL_NO_HW
  81 # ifndef OPENSSL_NO_HW_PADLOCK
  82
  83 /* Attempt to have a single source for both 0.9.7 and 0.9.8 :-) */
  84 #  if (OPENSSL_VERSION_NUMBER >= 0x00908000L)
  85 #   ifndef OPENSSL_NO_DYNAMIC_ENGINE
  86 #    define DYNAMIC_ENGINE
  87 #   endif
  88 #  elif (OPENSSL_VERSION_NUMBER >= 0x00907000L)
  89 #   ifdef ENGINE_DYNAMIC_SUPPORT
  90 #    define DYNAMIC_ENGINE
  91 #   endif
  92 #  else
  93 #   error "Only OpenSSL >= 0.9.7 is supported"
  94 #  endif
  95
  96 /*
  97  * VIA PadLock AES is available *ONLY* on some x86 CPUs. Not only that it
  98  * doesn't exist elsewhere, but it even can't be compiled on other platforms!
  99  */
 100
 101 #  undef COMPILE_HW_PADLOCK
 102 #  if !defined(I386_ONLY) && !defined(OPENSSL_NO_ASM)
 103 #   if    defined(__i386__) || defined(__i386) ||    \
 104         defined(__x86_64__) || defined(__x86_64) || \
 105         defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64) || \
 106         defined(__INTEL__)
 107 #    define COMPILE_HW_PADLOCK
 108 #    ifdef OPENSSL_NO_DYNAMIC_ENGINE
 109 static ENGINE *ENGINE_padlock(void);
 110 #    endif
 111 #   endif
 112 #  endif
 113
 114 #  ifdef OPENSSL_NO_DYNAMIC_ENGINE
 115 void engine_load_padlock_internal(void);
 116 void engine_load_padlock_internal(void)
 117 {
 118 /* On non-x86 CPUs it just returns. */
 119 #   ifdef COMPILE_HW_PADLOCK
 120     ENGINE *toadd = ENGINE_padlock();
 121     if (!toadd)
 122         return;
 123     ENGINE_add(toadd);
 124     ENGINE_free(toadd);
 125     ERR_clear_error();
 126 #   endif
 127 }
 128
 129 #  endif
 130
 131 #  ifdef COMPILE_HW_PADLOCK
 132
 133 /* Function for ENGINE detection and control */
 134 static int padlock_available(void);
 135 static int padlock_init(ENGINE *e);
 136
 137 /* RNG Stuff */
 138 static RAND_METHOD padlock_rand;
 139
 140 /* Cipher Stuff */
 141 #   ifndef OPENSSL_NO_AES
 142 static int padlock_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 143                            const int **nids, int nid);
 144 #   endif
 145
 146 /* Engine names */
 147 static const char *padlock_id = "padlock";
 148 static char padlock_name[100];
 149
 150 /* Available features */
 151 static int padlock_use_ace = 0; /* Advanced Cryptography Engine */
 152 static int padlock_use_rng = 0; /* Random Number Generator */
 153
 154 /* ===== Engine "management" functions ===== */
 155
 156 /* Prepare the ENGINE structure for registration */
 157 static int padlock_bind_helper(ENGINE *e)
 158 {
 159     /* Check available features */
 160     padlock_available();
 161
 162     /*
 163      * RNG is currently disabled for reasons discussed in commentary just
 164      * before padlock_rand_bytes function.
 165      */
 166     padlock_use_rng = 0;
 167
 168     /* Generate a nice engine name with available features */
 169     BIO_snprintf(padlock_name, sizeof(padlock_name),
 170                  "VIA PadLock (%s, %s)",
 171                  padlock_use_rng ? "RNG" : "no-RNG",
 172                  padlock_use_ace ? "ACE" : "no-ACE");
 173
 174     /* Register everything or return with an error */
 175     if (!ENGINE_set_id(e, padlock_id) ||
 176         !ENGINE_set_name(e, padlock_name) ||
 177         !ENGINE_set_init_function(e, padlock_init) ||
 178 #   ifndef OPENSSL_NO_AES
 179         (padlock_use_ace && !ENGINE_set_ciphers(e, padlock_ciphers)) ||
 180 #   endif
 181         (padlock_use_rng && !ENGINE_set_RAND(e, &padlock_rand))) {
 182         return 0;
 183     }
 184
 185     /* Everything looks good */
 186     return 1;
 187 }
 188
 189 #   ifdef OPENSSL_NO_DYNAMIC_ENGINE
 190 /* Constructor */
 191 static ENGINE *ENGINE_padlock(void)
 192 {
 193     ENGINE *eng = ENGINE_new();
 194
 195     if (eng == NULL) {
 196         return NULL;
 197     }
 198
 199     if (!padlock_bind_helper(eng)) {
 200         ENGINE_free(eng);
 201         return NULL;
 202     }
 203
 204     return eng;
 205 }
 206 #   endif
 207
 208 /* Check availability of the engine */
 209 static int padlock_init(ENGINE *e)
 210 {
 211     return (padlock_use_rng || padlock_use_ace);
 212 }
 213
 214 /*
 215  * This stuff is needed if this ENGINE is being compiled into a
 216  * self-contained shared-library.
 217  */
 218 #   ifdef DYNAMIC_ENGINE
 219 static int padlock_bind_fn(ENGINE *e, const char *id)
 220 {
 221     if (id && (strcmp(id, padlock_id) != 0)) {
 222         return 0;
 223     }
 224
 225     if (!padlock_bind_helper(e)) {
 226         return 0;
 227     }
 228
 229     return 1;
 230 }
 231
 232 IMPLEMENT_DYNAMIC_CHECK_FN()
 233 IMPLEMENT_DYNAMIC_BIND_FN(padlock_bind_fn)
 234 #   endif                       /* DYNAMIC_ENGINE */
 235 /* ===== Here comes the "real" engine ===== */
 236 #   ifndef OPENSSL_NO_AES
 237 /* Some AES-related constants */
 238 #    define AES_BLOCK_SIZE          16
 239 #    define AES_KEY_SIZE_128        16
 240 #    define AES_KEY_SIZE_192        24
 241 #    define AES_KEY_SIZE_256        32
 242     /*
 243      * Here we store the status information relevant to the current context.
 244      */
 245     /*
 246      * BIG FAT WARNING: Inline assembler in PADLOCK_XCRYPT_ASM() depends on
 247      * the order of items in this structure.  Don't blindly modify, reorder,
 248      * etc!
 249      */
 250 struct padlock_cipher_data {
 251     unsigned char iv[AES_BLOCK_SIZE]; /* Initialization vector */
 252     union {
 253         unsigned int pad[4];
 254         struct {
 255             int rounds:4;
 256             int dgst:1;         /* n/a in C3 */
 257             int align:1;        /* n/a in C3 */
 258             int ciphr:1;        /* n/a in C3 */
 259             unsigned int keygen:1;
 260             int interm:1;
 261             unsigned int encdec:1;
 262             int ksize:2;
 263         } b;
 264     } cword;                    /* Control word */
 265     AES_KEY ks;                 /* Encryption key */
 266 };
 267 #   endif
 268
 269 /* Interface to assembler module */
 270 unsigned int padlock_capability();
 271 void padlock_key_bswap(AES_KEY *key);
 272 void padlock_verify_context(struct padlock_cipher_data *ctx);
 273 void padlock_reload_key();
 274 void padlock_aes_block(void *out, const void *inp,
 275                        struct padlock_cipher_data *ctx);
 276 int padlock_ecb_encrypt(void *out, const void *inp,
 277                         struct padlock_cipher_data *ctx, size_t len);
 278 int padlock_cbc_encrypt(void *out, const void *inp,
 279                         struct padlock_cipher_data *ctx, size_t len);
 280 int padlock_cfb_encrypt(void *out, const void *inp,
 281                         struct padlock_cipher_data *ctx, size_t len);
 282 int padlock_ofb_encrypt(void *out, const void *inp,
 283                         struct padlock_cipher_data *ctx, size_t len);
 284 int padlock_ctr32_encrypt(void *out, const void *inp,
 285                           struct padlock_cipher_data *ctx, size_t len);
 286 int padlock_xstore(void *out, int edx);
 287 void padlock_sha1_oneshot(void *ctx, const void *inp, size_t len);
 288 void padlock_sha1(void *ctx, const void *inp, size_t len);
 289 void padlock_sha256_oneshot(void *ctx, const void *inp, size_t len);
 290 void padlock_sha256(void *ctx, const void *inp, size_t len);
 291
 292 /*
 293  * Load supported features of the CPU to see if the PadLock is available.
 294  */
 295 static int padlock_available(void)
 296 {
 297     unsigned int edx = padlock_capability();
 298
 299     /* Fill up some flags */
 300     padlock_use_ace = ((edx & (0x3 << 6)) == (0x3 << 6));
 301     padlock_use_rng = ((edx & (0x3 << 2)) == (0x3 << 2));
 302
 303     return padlock_use_ace + padlock_use_rng;
 304 }
 305
 306 /* ===== AES encryption/decryption ===== */
 307 #   ifndef OPENSSL_NO_AES
 308
 309 #    if defined(NID_aes_128_cfb128) && ! defined (NID_aes_128_cfb)
 310 #     define NID_aes_128_cfb NID_aes_128_cfb128
 311 #    endif
 312
 313 #    if defined(NID_aes_128_ofb128) && ! defined (NID_aes_128_ofb)
 314 #     define NID_aes_128_ofb NID_aes_128_ofb128
 315 #    endif
 316
 317 #    if defined(NID_aes_192_cfb128) && ! defined (NID_aes_192_cfb)
 318 #     define NID_aes_192_cfb NID_aes_192_cfb128
 319 #    endif
 320
 321 #    if defined(NID_aes_192_ofb128) && ! defined (NID_aes_192_ofb)
 322 #     define NID_aes_192_ofb NID_aes_192_ofb128
 323 #    endif
 324
 325 #    if defined(NID_aes_256_cfb128) && ! defined (NID_aes_256_cfb)
 326 #     define NID_aes_256_cfb NID_aes_256_cfb128
 327 #    endif
 328
 329 #    if defined(NID_aes_256_ofb128) && ! defined (NID_aes_256_ofb)
 330 #     define NID_aes_256_ofb NID_aes_256_ofb128
 331 #    endif
 332
 333 /* List of supported ciphers. */
 334 static const int padlock_cipher_nids[] = {
 335     NID_aes_128_ecb,
 336     NID_aes_128_cbc,
 337     NID_aes_128_cfb,
 338     NID_aes_128_ofb,
 339     NID_aes_128_ctr,
 340
 341     NID_aes_192_ecb,
 342     NID_aes_192_cbc,
 343     NID_aes_192_cfb,
 344     NID_aes_192_ofb,
 345     NID_aes_192_ctr,
 346
 347     NID_aes_256_ecb,
 348     NID_aes_256_cbc,
 349     NID_aes_256_cfb,
 350     NID_aes_256_ofb,
 351     NID_aes_256_ctr
 352 };
 353
 354 static int padlock_cipher_nids_num = (sizeof(padlock_cipher_nids) /
 355                                       sizeof(padlock_cipher_nids[0]));
 356
 357 /* Function prototypes ... */
 358 static int padlock_aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 359                                 const unsigned char *iv, int enc);
 360
 361 #    define NEAREST_ALIGNED(ptr) ( (unsigned char *)(ptr) +         \
 362         ( (0x10 - ((size_t)(ptr) & 0x0F)) & 0x0F )      )
 363 #    define ALIGNED_CIPHER_DATA(ctx) ((struct padlock_cipher_data *)\
 364         NEAREST_ALIGNED(EVP_CIPHER_CTX_get_cipher_data(ctx)))
 365
 366 static int
 367 padlock_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
 368                    const unsigned char *in_arg, size_t nbytes)
 369 {
 370     return padlock_ecb_encrypt(out_arg, in_arg,
 371                                ALIGNED_CIPHER_DATA(ctx), nbytes);
 372 }
 373
 374 static int
 375 padlock_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
 376                    const unsigned char *in_arg, size_t nbytes)
 377 {
 378     struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
 379     int ret;
 380
 381     memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
 382     if ((ret = padlock_cbc_encrypt(out_arg, in_arg, cdata, nbytes)))
 383         memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
 384     return ret;
 385 }
 386
 387 static int
 388 padlock_cfb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
 389                    const unsigned char *in_arg, size_t nbytes)
 390 {
 391     struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
 392     size_t chunk;
 393
 394     if ((chunk = EVP_CIPHER_CTX_num(ctx))) {   /* borrow chunk variable */
 395         unsigned char *ivp = EVP_CIPHER_CTX_iv_noconst(ctx);
 396
 397         if (chunk >= AES_BLOCK_SIZE)
 398             return 0;           /* bogus value */
 399
 400         if (EVP_CIPHER_CTX_encrypting(ctx))
 401             while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
 402                 ivp[chunk] = *(out_arg++) = *(in_arg++) ^ ivp[chunk];
 403                 chunk++, nbytes--;
 404         } else
 405             while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
 406                 unsigned char c = *(in_arg++);
 407                 *(out_arg++) = c ^ ivp[chunk];
 408                 ivp[chunk++] = c, nbytes--;
 409             }
 410
 411         EVP_CIPHER_CTX_set_num(ctx, chunk % AES_BLOCK_SIZE);
 412     }
 413
 414     if (nbytes == 0)
 415         return 1;
 416
 417     memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
 418
 419     if ((chunk = nbytes & ~(AES_BLOCK_SIZE - 1))) {
 420         if (!padlock_cfb_encrypt(out_arg, in_arg, cdata, chunk))
 421             return 0;
 422         nbytes -= chunk;
 423     }
 424
 425     if (nbytes) {
 426         unsigned char *ivp = cdata->iv;
 427
 428         out_arg += chunk;
 429         in_arg += chunk;
 430         EVP_CIPHER_CTX_set_num(ctx, nbytes);
 431         if (cdata->cword.b.encdec) {
 432             cdata->cword.b.encdec = 0;
 433             padlock_reload_key();
 434             padlock_aes_block(ivp, ivp, cdata);
 435             cdata->cword.b.encdec = 1;
 436             padlock_reload_key();
 437             while (nbytes) {
 438                 unsigned char c = *(in_arg++);
 439                 *(out_arg++) = c ^ *ivp;
 440                 *(ivp++) = c, nbytes--;
 441             }
 442         } else {
 443             padlock_reload_key();
 444             padlock_aes_block(ivp, ivp, cdata);
 445             padlock_reload_key();
 446             while (nbytes) {
 447                 *ivp = *(out_arg++) = *(in_arg++) ^ *ivp;
 448                 ivp++, nbytes--;
 449             }
 450         }
 451     }
 452
 453     memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
 454
 455     return 1;
 456 }
 457
 458 static int
 459 padlock_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
 460                    const unsigned char *in_arg, size_t nbytes)
 461 {
 462     struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
 463     size_t chunk;
 464
 465     /*
 466      * ctx->num is maintained in byte-oriented modes, such as CFB and OFB...
 467      */
 468     if ((chunk = EVP_CIPHER_CTX_num(ctx))) {   /* borrow chunk variable */
 469         unsigned char *ivp = EVP_CIPHER_CTX_iv_noconst(ctx);
 470
 471         if (chunk >= AES_BLOCK_SIZE)
 472             return 0;           /* bogus value */
 473
 474         while (chunk < AES_BLOCK_SIZE && nbytes != 0) {
 475             *(out_arg++) = *(in_arg++) ^ ivp[chunk];
 476             chunk++, nbytes--;
 477         }
 478
 479         EVP_CIPHER_CTX_set_num(ctx, chunk % AES_BLOCK_SIZE);
 480     }
 481
 482     if (nbytes == 0)
 483         return 1;
 484
 485     memcpy(cdata->iv, EVP_CIPHER_CTX_iv(ctx), AES_BLOCK_SIZE);
 486
 487     if ((chunk = nbytes & ~(AES_BLOCK_SIZE - 1))) {
 488         if (!padlock_ofb_encrypt(out_arg, in_arg, cdata, chunk))
 489             return 0;
 490         nbytes -= chunk;
 491     }
 492
 493     if (nbytes) {
 494         unsigned char *ivp = cdata->iv;
 495
 496         out_arg += chunk;
 497         in_arg += chunk;
 498         EVP_CIPHER_CTX_set_num(ctx, nbytes);
 499         padlock_reload_key();   /* empirically found */
 500         padlock_aes_block(ivp, ivp, cdata);
 501         padlock_reload_key();   /* empirically found */
 502         while (nbytes) {
 503             *(out_arg++) = *(in_arg++) ^ *ivp;
 504             ivp++, nbytes--;
 505         }
 506     }
 507
 508     memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), cdata->iv, AES_BLOCK_SIZE);
 509
 510     return 1;
 511 }
 512
 513 static void padlock_ctr32_encrypt_glue(const unsigned char *in,
 514                                        unsigned char *out, size_t blocks,
 515                                        struct padlock_cipher_data *ctx,
 516                                        const unsigned char *ivec)
 517 {
 518     memcpy(ctx->iv, ivec, AES_BLOCK_SIZE);
 519     padlock_ctr32_encrypt(out, in, ctx, AES_BLOCK_SIZE * blocks);
 520 }
 521
 522 static int
 523 padlock_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
 524                    const unsigned char *in_arg, size_t nbytes)
 525 {
 526     struct padlock_cipher_data *cdata = ALIGNED_CIPHER_DATA(ctx);
 527     unsigned int num = EVP_CIPHER_CTX_num(ctx);
 528
 529     CRYPTO_ctr128_encrypt_ctr32(in_arg, out_arg, nbytes,
 530                                 cdata, EVP_CIPHER_CTX_iv_noconst(ctx),
 531                                 EVP_CIPHER_CTX_buf_noconst(ctx), &num,
 532                                 (ctr128_f) padlock_ctr32_encrypt_glue);
 533
 534     EVP_CIPHER_CTX_set_num(ctx, (size_t)num);
 535     return 1;
 536 }
 537
 538 #    define EVP_CIPHER_block_size_ECB       AES_BLOCK_SIZE
 539 #    define EVP_CIPHER_block_size_CBC       AES_BLOCK_SIZE
 540 #    define EVP_CIPHER_block_size_OFB       1
 541 #    define EVP_CIPHER_block_size_CFB       1
 542 #    define EVP_CIPHER_block_size_CTR       1
 543
 544 /*
 545  * Declaring so many ciphers by hand would be a pain. Instead introduce a bit
 546  * of preprocessor magic :-)
 547  */
 548 #    define DECLARE_AES_EVP(ksize,lmode,umode)      \
 549 static EVP_CIPHER *_hidden_aes_##ksize##_##lmode = NULL; \
 550 static const EVP_CIPHER *padlock_aes_##ksize##_##lmode(void) \
 551 {                                                                       \
 552     if (_hidden_aes_##ksize##_##lmode == NULL                           \
 553         && ((_hidden_aes_##ksize##_##lmode =                            \
 554              EVP_CIPHER_meth_new(NID_aes_##ksize##_##lmode,             \
 555                                  EVP_CIPHER_block_size_##umode,         \
 556                                  AES_KEY_SIZE_##ksize)) == NULL         \
 557             || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_##ksize##_##lmode, \
 558                                               AES_BLOCK_SIZE)           \
 559             || !EVP_CIPHER_meth_set_flags(_hidden_aes_##ksize##_##lmode, \
 560                                           0 | EVP_CIPH_##umode##_MODE)  \
 561             || !EVP_CIPHER_meth_set_init(_hidden_aes_##ksize##_##lmode, \
 562                                          padlock_aes_init_key)          \
 563             || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_##ksize##_##lmode, \
 564                                               padlock_##lmode##_cipher) \
 565             || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_##ksize##_##lmode, \
 566                                                   sizeof(struct padlock_cipher_data) + 16) \
 567             || !EVP_CIPHER_meth_set_set_asn1_params(_hidden_aes_##ksize##_##lmode, \
 568                                                     EVP_CIPHER_set_asn1_iv) \
 569             || !EVP_CIPHER_meth_set_get_asn1_params(_hidden_aes_##ksize##_##lmode, \
 570                                                     EVP_CIPHER_get_asn1_iv))) { \
 571         EVP_CIPHER_meth_free(_hidden_aes_##ksize##_##lmode);            \
 572         _hidden_aes_##ksize##_##lmode = NULL;                           \
 573     }                                                                   \
 574     return _hidden_aes_##ksize##_##lmode;                               \
 575 }
 576
 577 DECLARE_AES_EVP(128, ecb, ECB)
 578 DECLARE_AES_EVP(128, cbc, CBC)
 579 DECLARE_AES_EVP(128, cfb, CFB)
 580 DECLARE_AES_EVP(128, ofb, OFB)
 581 DECLARE_AES_EVP(128, ctr, CTR)
 582
 583 DECLARE_AES_EVP(192, ecb, ECB)
 584 DECLARE_AES_EVP(192, cbc, CBC)
 585 DECLARE_AES_EVP(192, cfb, CFB)
 586 DECLARE_AES_EVP(192, ofb, OFB)
 587 DECLARE_AES_EVP(192, ctr, CTR)
 588
 589 DECLARE_AES_EVP(256, ecb, ECB)
 590 DECLARE_AES_EVP(256, cbc, CBC)
 591 DECLARE_AES_EVP(256, cfb, CFB)
 592 DECLARE_AES_EVP(256, ofb, OFB)
 593 DECLARE_AES_EVP(256, ctr, CTR)
 594
 595 static int
 596 padlock_ciphers(ENGINE *e, const EVP_CIPHER **cipher, const int **nids,
 597                 int nid)
 598 {
 599     /* No specific cipher => return a list of supported nids ... */
 600     if (!cipher) {
 601         *nids = padlock_cipher_nids;
 602         return padlock_cipher_nids_num;
 603     }
 604
 605     /* ... or the requested "cipher" otherwise */
 606     switch (nid) {
 607     case NID_aes_128_ecb:
 608         *cipher = padlock_aes_128_ecb();
 609         break;
 610     case NID_aes_128_cbc:
 611         *cipher = padlock_aes_128_cbc();
 612         break;
 613     case NID_aes_128_cfb:
 614         *cipher = padlock_aes_128_cfb();
 615         break;
 616     case NID_aes_128_ofb:
 617         *cipher = padlock_aes_128_ofb();
 618         break;
 619     case NID_aes_128_ctr:
 620         *cipher = padlock_aes_128_ctr();
 621         break;
 622
 623     case NID_aes_192_ecb:
 624         *cipher = padlock_aes_192_ecb();
 625         break;
 626     case NID_aes_192_cbc:
 627         *cipher = padlock_aes_192_cbc();
 628         break;
 629     case NID_aes_192_cfb:
 630         *cipher = padlock_aes_192_cfb();
 631         break;
 632     case NID_aes_192_ofb:
 633         *cipher = padlock_aes_192_ofb();
 634         break;
 635     case NID_aes_192_ctr:
 636         *cipher = padlock_aes_192_ctr();
 637         break;
 638
 639     case NID_aes_256_ecb:
 640         *cipher = padlock_aes_256_ecb();
 641         break;
 642     case NID_aes_256_cbc:
 643         *cipher = padlock_aes_256_cbc();
 644         break;
 645     case NID_aes_256_cfb:
 646         *cipher = padlock_aes_256_cfb();
 647         break;
 648     case NID_aes_256_ofb:
 649         *cipher = padlock_aes_256_ofb();
 650         break;
 651     case NID_aes_256_ctr:
 652         *cipher = padlock_aes_256_ctr();
 653         break;
 654
 655     default:
 656         /* Sorry, we don't support this NID */
 657         *cipher = NULL;
 658         return 0;
 659     }
 660
 661     return 1;
 662 }
 663
 664 /* Prepare the encryption key for PadLock usage */
 665 static int
 666 padlock_aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 667                      const unsigned char *iv, int enc)
 668 {
 669     struct padlock_cipher_data *cdata;
 670     int key_len = EVP_CIPHER_CTX_key_length(ctx) * 8;
 671     unsigned long mode = EVP_CIPHER_CTX_mode(ctx);
 672
 673     if (key == NULL)
 674         return 0;               /* ERROR */
 675
 676     cdata = ALIGNED_CIPHER_DATA(ctx);
 677     memset(cdata, 0, sizeof(*cdata));
 678
 679     /* Prepare Control word. */
 680     if (mode == EVP_CIPH_OFB_MODE || mode == EVP_CIPH_CTR_MODE)
 681         cdata->cword.b.encdec = 0;
 682     else
 683         cdata->cword.b.encdec = (EVP_CIPHER_CTX_encrypting(ctx) == 0);
 684     cdata->cword.b.rounds = 10 + (key_len - 128) / 32;
 685     cdata->cword.b.ksize = (key_len - 128) / 64;
 686
 687     switch (key_len) {
 688     case 128:
 689         /*
 690          * PadLock can generate an extended key for AES128 in hardware
 691          */
 692         memcpy(cdata->ks.rd_key, key, AES_KEY_SIZE_128);
 693         cdata->cword.b.keygen = 0;
 694         break;
 695
 696     case 192:
 697     case 256:
 698         /*
 699          * Generate an extended AES key in software. Needed for AES192/AES256
 700          */
 701         /*
 702          * Well, the above applies to Stepping 8 CPUs and is listed as
 703          * hardware errata. They most likely will fix it at some point and
 704          * then a check for stepping would be due here.
 705          */
 706         if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE)
 707             && !enc)
 708             AES_set_decrypt_key(key, key_len, &cdata->ks);
 709         else
 710             AES_set_encrypt_key(key, key_len, &cdata->ks);
 711 #    ifndef AES_ASM
 712         /*
 713          * OpenSSL C functions use byte-swapped extended key.
 714          */
 715         padlock_key_bswap(&cdata->ks);
 716 #    endif
 717         cdata->cword.b.keygen = 1;
 718         break;
 719
 720     default:
 721         /* ERROR */
 722         return 0;
 723     }
 724
 725     /*
 726      * This is done to cover for cases when user reuses the
 727      * context for new key. The catch is that if we don't do
 728      * this, padlock_eas_cipher might proceed with old key...
 729      */
 730     padlock_reload_key();
 731
 732     return 1;
 733 }
 734
 735 #   endif                       /* OPENSSL_NO_AES */
 736
 737 /* ===== Random Number Generator ===== */
 738 /*
 739  * This code is not engaged. The reason is that it does not comply
 740  * with recommendations for VIA RNG usage for secure applications
 741  * (posted at http://www.via.com.tw/en/viac3/c3.jsp) nor does it
 742  * provide meaningful error control...
 743  */
 744 /*
 745  * Wrapper that provides an interface between the API and the raw PadLock
 746  * RNG
 747  */
 748 static int padlock_rand_bytes(unsigned char *output, int count)
 749 {
 750     unsigned int eax, buf;
 751
 752     while (count >= 8) {
 753         eax = padlock_xstore(output, 0);
 754         if (!(eax & (1 << 6)))
 755             return 0;           /* RNG disabled */
 756         /* this ---vv--- covers DC bias, Raw Bits and String Filter */
 757         if (eax & (0x1F << 10))
 758             return 0;
 759         if ((eax & 0x1F) == 0)
 760             continue;           /* no data, retry... */
 761         if ((eax & 0x1F) != 8)
 762             return 0;           /* fatal failure...  */
 763         output += 8;
 764         count -= 8;
 765     }
 766     while (count > 0) {
 767         eax = padlock_xstore(&buf, 3);
 768         if (!(eax & (1 << 6)))
 769             return 0;           /* RNG disabled */
 770         /* this ---vv--- covers DC bias, Raw Bits and String Filter */
 771         if (eax & (0x1F << 10))
 772             return 0;
 773         if ((eax & 0x1F) == 0)
 774             continue;           /* no data, retry... */
 775         if ((eax & 0x1F) != 1)
 776             return 0;           /* fatal failure...  */
 777         *output++ = (unsigned char)buf;
 778         count--;
 779     }
 780     *(volatile unsigned int *)&buf = 0;
 781
 782     return 1;
 783 }
 784
 785 /* Dummy but necessary function */
 786 static int padlock_rand_status(void)
 787 {
 788     return 1;
 789 }
 790
 791 /* Prepare structure for registration */
 792 static RAND_METHOD padlock_rand = {
 793     NULL,                       /* seed */
 794     padlock_rand_bytes,         /* bytes */
 795     NULL,                       /* cleanup */
 796     NULL,                       /* add */
 797     padlock_rand_bytes,         /* pseudorand */
 798     padlock_rand_status,        /* rand status */
 799 };
 800
 801 #  endif                        /* COMPILE_HW_PADLOCK */
 802 # endif                         /* !OPENSSL_NO_HW_PADLOCK */
 803 #endif                          /* !OPENSSL_NO_HW */
 804
 805 #if defined(OPENSSL_NO_HW) || defined(OPENSSL_NO_HW_PADLOCK) \
 806         || !defined(COMPILE_HW_PADLOCK)
 807 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
 808 OPENSSL_EXPORT
 809     int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns);
 810 OPENSSL_EXPORT
 811     int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns)
 812 {
 813     return 0;
 814 }
 815
 816 IMPLEMENT_DYNAMIC_CHECK_FN()
 817 # endif
 818 #endif