sys/opencrypto/cryptosoft.c

   1 /*      $OpenBSD: cryptosoft.c,v 1.35 2002/04/26 08:43:50 deraadt Exp $ */
   2
   3 /*-
   4  * The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu)
   5  * Copyright (c) 2002-2006 Sam Leffler, Errno Consulting
   6  *
   7  * This code was written by Angelos D. Keromytis in Athens, Greece, in
   8  * February 2000. Network Security Technologies Inc. (NSTI) kindly
   9  * supported the development of this code.
  10  *
  11  * Copyright (c) 2000, 2001 Angelos D. Keromytis
  12  *
  13  * Permission to use, copy, and modify this software with or without fee
  14  * is hereby granted, provided that this entire notice is included in
  15  * all source code copies of any software which is or includes a copy or
  16  * modification of this software.
  17  *
  18  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
  19  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
  20  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
  21  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
  22  * PURPOSE.
  23  */
  24
  25 #include <sys/cdefs.h>
  26 __FBSDID("$FreeBSD$");
  27
  28 #include <sys/param.h>
  29 #include <sys/systm.h>
  30 #include <sys/malloc.h>
  31 #include <sys/mbuf.h>
  32 #include <sys/module.h>
  33 #include <sys/sysctl.h>
  34 #include <sys/errno.h>
  35 #include <sys/random.h>
  36 #include <sys/kernel.h>
  37 #include <sys/uio.h>
  38
  39 #include <crypto/blowfish/blowfish.h>
  40 #include <crypto/sha1.h>
  41 #include <opencrypto/rmd160.h>
  42 #include <opencrypto/cast.h>
  43 #include <opencrypto/skipjack.h>
  44 #include <sys/md5.h>
  45
  46 #include <opencrypto/cryptodev.h>
  47 #include <opencrypto/cryptosoft.h>
  48 #include <opencrypto/xform.h>
  49
  50 #include <sys/kobj.h>
  51 #include <sys/bus.h>
  52 #include "cryptodev_if.h"
  53
  54 static  int32_t swcr_id;
  55 static  struct swcr_data **swcr_sessions = NULL;
  56 static  u_int32_t swcr_sesnum;
  57
  58 u_int8_t hmac_ipad_buffer[HMAC_MAX_BLOCK_LEN];
  59 u_int8_t hmac_opad_buffer[HMAC_MAX_BLOCK_LEN];
  60
  61 static  int swcr_encdec(struct cryptodesc *, struct swcr_data *, caddr_t, int);
  62 static  int swcr_authcompute(struct cryptodesc *, struct swcr_data *, caddr_t, int);
  63 static  int swcr_compdec(struct cryptodesc *, struct swcr_data *, caddr_t, int);
  64 static  int swcr_freesession(device_t dev, u_int64_t tid);
  65
  66 /*
  67  * Apply a symmetric encryption/decryption algorithm.
  68  */
  69 static int
  70 swcr_encdec(struct cryptodesc *crd, struct swcr_data *sw, caddr_t buf,
  71     int flags)
  72 {
  73         unsigned char iv[EALG_MAX_BLOCK_LEN], blk[EALG_MAX_BLOCK_LEN], *idat;
  74         unsigned char *ivp, piv[EALG_MAX_BLOCK_LEN];
  75         struct enc_xform *exf;
  76         int i, k, j, blks;
  77
  78         exf = sw->sw_exf;
  79         blks = exf->blocksize;
  80
  81         /* Check for non-padded data */
  82         if (crd->crd_len % blks)
  83                 return EINVAL;
  84
  85         /* Initialize the IV */
  86         if (crd->crd_flags & CRD_F_ENCRYPT) {
  87                 /* IV explicitly provided ? */
  88                 if (crd->crd_flags & CRD_F_IV_EXPLICIT)
  89                         bcopy(crd->crd_iv, iv, blks);
  90                 else
  91                         arc4rand(iv, blks, 0);
  92
  93                 /* Do we need to write the IV */
  94                 if (!(crd->crd_flags & CRD_F_IV_PRESENT))
  95                         crypto_copyback(flags, buf, crd->crd_inject, blks, iv);
  96
  97         } else {        /* Decryption */
  98                         /* IV explicitly provided ? */
  99                 if (crd->crd_flags & CRD_F_IV_EXPLICIT)
 100                         bcopy(crd->crd_iv, iv, blks);
 101                 else {
 102                         /* Get IV off buf */
 103                         crypto_copydata(flags, buf, crd->crd_inject, blks, iv);
 104                 }
 105         }
 106
 107         if (crd->crd_flags & CRD_F_KEY_EXPLICIT) {
 108                 int error;
 109
 110                 if (sw->sw_kschedule)
 111                         exf->zerokey(&(sw->sw_kschedule));
 112                 error = exf->setkey(&sw->sw_kschedule,
 113                                 crd->crd_key, crd->crd_klen / 8);
 114                 if (error)
 115                         return (error);
 116         }
 117         ivp = iv;
 118
 119         if (flags & CRYPTO_F_IMBUF) {
 120                 struct mbuf *m = (struct mbuf *) buf;
 121
 122                 /* Find beginning of data */
 123                 m = m_getptr(m, crd->crd_skip, &k);
 124                 if (m == NULL)
 125                         return EINVAL;
 126
 127                 i = crd->crd_len;
 128
 129                 while (i > 0) {
 130                         /*
 131                          * If there's insufficient data at the end of
 132                          * an mbuf, we have to do some copying.
 133                          */
 134                         if (m->m_len < k + blks && m->m_len != k) {
 135                                 m_copydata(m, k, blks, blk);
 136
 137                                 /* Actual encryption/decryption */
 138                                 if (crd->crd_flags & CRD_F_ENCRYPT) {
 139                                         /* XOR with previous block */
 140                                         for (j = 0; j < blks; j++)
 141                                                 blk[j] ^= ivp[j];
 142
 143                                         exf->encrypt(sw->sw_kschedule, blk);
 144
 145                                         /*
 146                                          * Keep encrypted block for XOR'ing
 147                                          * with next block
 148                                          */
 149                                         bcopy(blk, iv, blks);
 150                                         ivp = iv;
 151                                 } else {        /* decrypt */
 152                                         /*
 153                                          * Keep encrypted block for XOR'ing
 154                                          * with next block
 155                                          */
 156                                         if (ivp == iv)
 157                                                 bcopy(blk, piv, blks);
 158                                         else
 159                                                 bcopy(blk, iv, blks);
 160
 161                                         exf->decrypt(sw->sw_kschedule, blk);
 162
 163                                         /* XOR with previous block */
 164                                         for (j = 0; j < blks; j++)
 165                                                 blk[j] ^= ivp[j];
 166
 167                                         if (ivp == iv)
 168                                                 bcopy(piv, iv, blks);
 169                                         else
 170                                                 ivp = iv;
 171                                 }
 172
 173                                 /* Copy back decrypted block */
 174                                 m_copyback(m, k, blks, blk);
 175
 176                                 /* Advance pointer */
 177                                 m = m_getptr(m, k + blks, &k);
 178                                 if (m == NULL)
 179                                         return EINVAL;
 180
 181                                 i -= blks;
 182
 183                                 /* Could be done... */
 184                                 if (i == 0)
 185                                         break;
 186                         }
 187
 188                         /* Skip possibly empty mbufs */
 189                         if (k == m->m_len) {
 190                                 for (m = m->m_next; m && m->m_len == 0;
 191                                     m = m->m_next)
 192                                         ;
 193                                 k = 0;
 194                         }
 195
 196                         /* Sanity check */
 197                         if (m == NULL)
 198                                 return EINVAL;
 199
 200                         /*
 201                          * Warning: idat may point to garbage here, but
 202                          * we only use it in the while() loop, only if
 203                          * there are indeed enough data.
 204                          */
 205                         idat = mtod(m, unsigned char *) + k;
 206
 207                         while (m->m_len >= k + blks && i > 0) {
 208                                 if (crd->crd_flags & CRD_F_ENCRYPT) {
 209                                         /* XOR with previous block/IV */
 210                                         for (j = 0; j < blks; j++)
 211                                                 idat[j] ^= ivp[j];
 212
 213                                         exf->encrypt(sw->sw_kschedule, idat);
 214                                         ivp = idat;
 215                                 } else {        /* decrypt */
 216                                         /*
 217                                          * Keep encrypted block to be used
 218                                          * in next block's processing.
 219                                          */
 220                                         if (ivp == iv)
 221                                                 bcopy(idat, piv, blks);
 222                                         else
 223                                                 bcopy(idat, iv, blks);
 224
 225                                         exf->decrypt(sw->sw_kschedule, idat);
 226
 227                                         /* XOR with previous block/IV */
 228                                         for (j = 0; j < blks; j++)
 229                                                 idat[j] ^= ivp[j];
 230
 231                                         if (ivp == iv)
 232                                                 bcopy(piv, iv, blks);
 233                                         else
 234                                                 ivp = iv;
 235                                 }
 236
 237                                 idat += blks;
 238                                 k += blks;
 239                                 i -= blks;
 240                         }
 241                 }
 242
 243                 return 0; /* Done with mbuf encryption/decryption */
 244         } else if (flags & CRYPTO_F_IOV) {
 245                 struct uio *uio = (struct uio *) buf;
 246                 struct iovec *iov;
 247
 248                 /* Find beginning of data */
 249                 iov = cuio_getptr(uio, crd->crd_skip, &k);
 250                 if (iov == NULL)
 251                         return EINVAL;
 252
 253                 i = crd->crd_len;
 254
 255                 while (i > 0) {
 256                         /*
 257                          * If there's insufficient data at the end of
 258                          * an iovec, we have to do some copying.
 259                          */
 260                         if (iov->iov_len < k + blks && iov->iov_len != k) {
 261                                 cuio_copydata(uio, k, blks, blk);
 262
 263                                 /* Actual encryption/decryption */
 264                                 if (crd->crd_flags & CRD_F_ENCRYPT) {
 265                                         /* XOR with previous block */
 266                                         for (j = 0; j < blks; j++)
 267                                                 blk[j] ^= ivp[j];
 268
 269                                         exf->encrypt(sw->sw_kschedule, blk);
 270
 271                                         /*
 272                                          * Keep encrypted block for XOR'ing
 273                                          * with next block
 274                                          */
 275                                         bcopy(blk, iv, blks);
 276                                         ivp = iv;
 277                                 } else {        /* decrypt */
 278                                         /*
 279                                          * Keep encrypted block for XOR'ing
 280                                          * with next block
 281                                          */
 282                                         if (ivp == iv)
 283                                                 bcopy(blk, piv, blks);
 284                                         else
 285                                                 bcopy(blk, iv, blks);
 286
 287                                         exf->decrypt(sw->sw_kschedule, blk);
 288
 289                                         /* XOR with previous block */
 290                                         for (j = 0; j < blks; j++)
 291                                                 blk[j] ^= ivp[j];
 292
 293                                         if (ivp == iv)
 294                                                 bcopy(piv, iv, blks);
 295                                         else
 296                                                 ivp = iv;
 297                                 }
 298
 299                                 /* Copy back decrypted block */
 300                                 cuio_copyback(uio, k, blks, blk);
 301
 302                                 /* Advance pointer */
 303                                 iov = cuio_getptr(uio, k + blks, &k);
 304                                 if (iov == NULL)
 305                                         return EINVAL;
 306
 307                                 i -= blks;
 308
 309                                 /* Could be done... */
 310                                 if (i == 0)
 311                                         break;
 312                         }
 313
 314                         /*
 315                          * Warning: idat may point to garbage here, but
 316                          * we only use it in the while() loop, only if
 317                          * there are indeed enough data.
 318                          */
 319                         idat = (char *)iov->iov_base + k;
 320
 321                         while (iov->iov_len >= k + blks && i > 0) {
 322                                 if (crd->crd_flags & CRD_F_ENCRYPT) {
 323                                         /* XOR with previous block/IV */
 324                                         for (j = 0; j < blks; j++)
 325                                                 idat[j] ^= ivp[j];
 326
 327                                         exf->encrypt(sw->sw_kschedule, idat);
 328                                         ivp = idat;
 329                                 } else {        /* decrypt */
 330                                         /*
 331                                          * Keep encrypted block to be used
 332                                          * in next block's processing.
 333                                          */
 334                                         if (ivp == iv)
 335                                                 bcopy(idat, piv, blks);
 336                                         else
 337                                                 bcopy(idat, iv, blks);
 338
 339                                         exf->decrypt(sw->sw_kschedule, idat);
 340
 341                                         /* XOR with previous block/IV */
 342                                         for (j = 0; j < blks; j++)
 343                                                 idat[j] ^= ivp[j];
 344
 345                                         if (ivp == iv)
 346                                                 bcopy(piv, iv, blks);
 347                                         else
 348                                                 ivp = iv;
 349                                 }
 350
 351                                 idat += blks;
 352                                 k += blks;
 353                                 i -= blks;
 354                         }
 355                 }
 356
 357                 return 0; /* Done with iovec encryption/decryption */
 358         } else {        /* contiguous buffer */
 359                 if (crd->crd_flags & CRD_F_ENCRYPT) {
 360                         for (i = crd->crd_skip;
 361                             i < crd->crd_skip + crd->crd_len; i += blks) {
 362                                 /* XOR with the IV/previous block, as appropriate. */
 363                                 if (i == crd->crd_skip)
 364                                         for (k = 0; k < blks; k++)
 365                                                 buf[i + k] ^= ivp[k];
 366                                 else
 367                                         for (k = 0; k < blks; k++)
 368                                                 buf[i + k] ^= buf[i + k - blks];
 369                                 exf->encrypt(sw->sw_kschedule, buf + i);
 370                         }
 371                 } else {                /* Decrypt */
 372                         /*
 373                          * Start at the end, so we don't need to keep the encrypted
 374                          * block as the IV for the next block.
 375                          */
 376                         for (i = crd->crd_skip + crd->crd_len - blks;
 377                             i >= crd->crd_skip; i -= blks) {
 378                                 exf->decrypt(sw->sw_kschedule, buf + i);
 379
 380                                 /* XOR with the IV/previous block, as appropriate */
 381                                 if (i == crd->crd_skip)
 382                                         for (k = 0; k < blks; k++)
 383                                                 buf[i + k] ^= ivp[k];
 384                                 else
 385                                         for (k = 0; k < blks; k++)
 386                                                 buf[i + k] ^= buf[i + k - blks];
 387                         }
 388                 }
 389
 390                 return 0; /* Done with contiguous buffer encryption/decryption */
 391         }
 392
 393         /* Unreachable */
 394         return EINVAL;
 395 }
 396
 397 static void
 398 swcr_authprepare(struct auth_hash *axf, struct swcr_data *sw, u_char *key,
 399     int klen)
 400 {
 401         int k;
 402
 403         klen /= 8;
 404
 405         switch (axf->type) {
 406         case CRYPTO_MD5_HMAC:
 407         case CRYPTO_SHA1_HMAC:
 408         case CRYPTO_SHA2_256_HMAC:
 409         case CRYPTO_SHA2_384_HMAC:
 410         case CRYPTO_SHA2_512_HMAC:
 411         case CRYPTO_NULL_HMAC:
 412         case CRYPTO_RIPEMD160_HMAC:
 413                 for (k = 0; k < klen; k++)
 414                         key[k] ^= HMAC_IPAD_VAL;
 415
 416                 axf->Init(sw->sw_ictx);
 417                 axf->Update(sw->sw_ictx, key, klen);
 418                 axf->Update(sw->sw_ictx, hmac_ipad_buffer, axf->blocksize - klen);
 419
 420                 for (k = 0; k < klen; k++)
 421                         key[k] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL);
 422
 423                 axf->Init(sw->sw_octx);
 424                 axf->Update(sw->sw_octx, key, klen);
 425                 axf->Update(sw->sw_octx, hmac_opad_buffer, axf->blocksize - klen);
 426
 427                 for (k = 0; k < klen; k++)
 428                         key[k] ^= HMAC_OPAD_VAL;
 429                 break;
 430         case CRYPTO_MD5_KPDK:
 431         case CRYPTO_SHA1_KPDK:
 432                 sw->sw_klen = klen;
 433                 bcopy(key, sw->sw_octx, klen);
 434                 axf->Init(sw->sw_ictx);
 435                 axf->Update(sw->sw_ictx, key, klen);
 436                 axf->Final(NULL, sw->sw_ictx);
 437                 break;
 438         default:
 439                 printf("%s: CRD_F_KEY_EXPLICIT flag given, but algorithm %d "
 440                     "doesn't use keys.\n", __func__, axf->type);
 441         }
 442 }
 443
 444 /*
 445  * Compute keyed-hash authenticator.
 446  */
 447 static int
 448 swcr_authcompute(struct cryptodesc *crd, struct swcr_data *sw, caddr_t buf,
 449     int flags)
 450 {
 451         unsigned char aalg[HASH_MAX_LEN];
 452         struct auth_hash *axf;
 453         union authctx ctx;
 454         int err;
 455
 456         if (sw->sw_ictx == 0)
 457                 return EINVAL;
 458
 459         axf = sw->sw_axf;
 460
 461         if (crd->crd_flags & CRD_F_KEY_EXPLICIT)
 462                 swcr_authprepare(axf, sw, crd->crd_key, crd->crd_klen);
 463
 464         bcopy(sw->sw_ictx, &ctx, axf->ctxsize);
 465
 466         err = crypto_apply(flags, buf, crd->crd_skip, crd->crd_len,
 467             (int (*)(void *, void *, unsigned int))axf->Update, (caddr_t)&ctx);
 468         if (err)
 469                 return err;
 470
 471         switch (sw->sw_alg) {
 472         case CRYPTO_MD5_HMAC:
 473         case CRYPTO_SHA1_HMAC:
 474         case CRYPTO_SHA2_256_HMAC:
 475         case CRYPTO_SHA2_384_HMAC:
 476         case CRYPTO_SHA2_512_HMAC:
 477         case CRYPTO_RIPEMD160_HMAC:
 478                 if (sw->sw_octx == NULL)
 479                         return EINVAL;
 480
 481                 axf->Final(aalg, &ctx);
 482                 bcopy(sw->sw_octx, &ctx, axf->ctxsize);
 483                 axf->Update(&ctx, aalg, axf->hashsize);
 484                 axf->Final(aalg, &ctx);
 485                 break;
 486
 487         case CRYPTO_MD5_KPDK:
 488         case CRYPTO_SHA1_KPDK:
 489                 if (sw->sw_octx == NULL)
 490                         return EINVAL;
 491
 492                 axf->Update(&ctx, sw->sw_octx, sw->sw_klen);
 493                 axf->Final(aalg, &ctx);
 494                 break;
 495
 496         case CRYPTO_NULL_HMAC:
 497                 axf->Final(aalg, &ctx);
 498                 break;
 499         }
 500
 501         /* Inject the authentication data */
 502         crypto_copyback(flags, buf, crd->crd_inject,
 503             sw->sw_mlen == 0 ? axf->hashsize : sw->sw_mlen, aalg);
 504         return 0;
 505 }
 506
 507 /*
 508  * Apply a compression/decompression algorithm
 509  */
 510 static int
 511 swcr_compdec(struct cryptodesc *crd, struct swcr_data *sw,
 512     caddr_t buf, int flags)
 513 {
 514         u_int8_t *data, *out;
 515         struct comp_algo *cxf;
 516         int adj;
 517         u_int32_t result;
 518
 519         cxf = sw->sw_cxf;
 520
 521         /* We must handle the whole buffer of data in one time
 522          * then if there is not all the data in the mbuf, we must
 523          * copy in a buffer.
 524          */
 525
 526         MALLOC(data, u_int8_t *, crd->crd_len, M_CRYPTO_DATA,  M_NOWAIT);
 527         if (data == NULL)
 528                 return (EINVAL);
 529         crypto_copydata(flags, buf, crd->crd_skip, crd->crd_len, data);
 530
 531         if (crd->crd_flags & CRD_F_COMP)
 532                 result = cxf->compress(data, crd->crd_len, &out);
 533         else
 534                 result = cxf->decompress(data, crd->crd_len, &out);
 535
 536         FREE(data, M_CRYPTO_DATA);
 537         if (result == 0)
 538                 return EINVAL;
 539
 540         /* Copy back the (de)compressed data. m_copyback is
 541          * extending the mbuf as necessary.
 542          */
 543         sw->sw_size = result;
 544         /* Check the compressed size when doing compression */
 545         if (crd->crd_flags & CRD_F_COMP) {
 546                 if (result > crd->crd_len) {
 547                         /* Compression was useless, we lost time */
 548                         FREE(out, M_CRYPTO_DATA);
 549                         return 0;
 550                 }
 551         }
 552
 553         crypto_copyback(flags, buf, crd->crd_skip, result, out);
 554         if (result < crd->crd_len) {
 555                 adj = result - crd->crd_len;
 556                 if (flags & CRYPTO_F_IMBUF) {
 557                         adj = result - crd->crd_len;
 558                         m_adj((struct mbuf *)buf, adj);
 559                 } else if (flags & CRYPTO_F_IOV) {
 560                         struct uio *uio = (struct uio *)buf;
 561                         int ind;
 562
 563                         adj = crd->crd_len - result;
 564                         ind = uio->uio_iovcnt - 1;
 565
 566                         while (adj > 0 && ind >= 0) {
 567                                 if (adj < uio->uio_iov[ind].iov_len) {
 568                                         uio->uio_iov[ind].iov_len -= adj;
 569                                         break;
 570                                 }
 571
 572                                 adj -= uio->uio_iov[ind].iov_len;
 573                                 uio->uio_iov[ind].iov_len = 0;
 574                                 ind--;
 575                                 uio->uio_iovcnt--;
 576                         }
 577                 }
 578         }
 579         FREE(out, M_CRYPTO_DATA);
 580         return 0;
 581 }
 582
 583 /*
 584  * Generate a new software session.
 585  */
 586 static int
 587 swcr_newsession(device_t dev, u_int32_t *sid, struct cryptoini *cri)
 588 {
 589         struct swcr_data **swd;
 590         struct auth_hash *axf;
 591         struct enc_xform *txf;
 592         struct comp_algo *cxf;
 593         u_int32_t i;
 594         int error;
 595
 596         if (sid == NULL || cri == NULL)
 597                 return EINVAL;
 598
 599         if (swcr_sessions) {
 600                 for (i = 1; i < swcr_sesnum; i++)
 601                         if (swcr_sessions[i] == NULL)
 602                                 break;
 603         } else
 604                 i = 1;          /* NB: to silence compiler warning */
 605
 606         if (swcr_sessions == NULL || i == swcr_sesnum) {
 607                 if (swcr_sessions == NULL) {
 608                         i = 1; /* We leave swcr_sessions[0] empty */
 609                         swcr_sesnum = CRYPTO_SW_SESSIONS;
 610                 } else
 611                         swcr_sesnum *= 2;
 612
 613                 swd = malloc(swcr_sesnum * sizeof(struct swcr_data *),
 614                     M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
 615                 if (swd == NULL) {
 616                         /* Reset session number */
 617                         if (swcr_sesnum == CRYPTO_SW_SESSIONS)
 618                                 swcr_sesnum = 0;
 619                         else
 620                                 swcr_sesnum /= 2;
 621                         return ENOBUFS;
 622                 }
 623
 624                 /* Copy existing sessions */
 625                 if (swcr_sessions != NULL) {
 626                         bcopy(swcr_sessions, swd,
 627                             (swcr_sesnum / 2) * sizeof(struct swcr_data *));
 628                         free(swcr_sessions, M_CRYPTO_DATA);
 629                 }
 630
 631                 swcr_sessions = swd;
 632         }
 633
 634         swd = &swcr_sessions[i];
 635         *sid = i;
 636
 637         while (cri) {
 638                 MALLOC(*swd, struct swcr_data *, sizeof(struct swcr_data),
 639                     M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
 640                 if (*swd == NULL) {
 641                         swcr_freesession(dev, i);
 642                         return ENOBUFS;
 643                 }
 644
 645                 switch (cri->cri_alg) {
 646                 case CRYPTO_DES_CBC:
 647                         txf = &enc_xform_des;
 648                         goto enccommon;
 649                 case CRYPTO_3DES_CBC:
 650                         txf = &enc_xform_3des;
 651                         goto enccommon;
 652                 case CRYPTO_BLF_CBC:
 653                         txf = &enc_xform_blf;
 654                         goto enccommon;
 655                 case CRYPTO_CAST_CBC:
 656                         txf = &enc_xform_cast5;
 657                         goto enccommon;
 658                 case CRYPTO_SKIPJACK_CBC:
 659                         txf = &enc_xform_skipjack;
 660                         goto enccommon;
 661                 case CRYPTO_RIJNDAEL128_CBC:
 662                         txf = &enc_xform_rijndael128;
 663                         goto enccommon;
 664                 case CRYPTO_CAMELLIA_CBC:
 665                         txf = &enc_xform_camellia;
 666                         goto enccommon;
 667                 case CRYPTO_NULL_CBC:
 668                         txf = &enc_xform_null;
 669                         goto enccommon;
 670                 enccommon:
 671                         if (cri->cri_key != NULL) {
 672                                 error = txf->setkey(&((*swd)->sw_kschedule),
 673                                     cri->cri_key, cri->cri_klen / 8);
 674                                 if (error) {
 675                                         swcr_freesession(dev, i);
 676                                         return error;
 677                                 }
 678                         }
 679                         (*swd)->sw_exf = txf;
 680                         break;
 681
 682                 case CRYPTO_MD5_HMAC:
 683                         axf = &auth_hash_hmac_md5;
 684                         goto authcommon;
 685                 case CRYPTO_SHA1_HMAC:
 686                         axf = &auth_hash_hmac_sha1;
 687                         goto authcommon;
 688                 case CRYPTO_SHA2_256_HMAC:
 689                         axf = &auth_hash_hmac_sha2_256;
 690                         goto authcommon;
 691                 case CRYPTO_SHA2_384_HMAC:
 692                         axf = &auth_hash_hmac_sha2_384;
 693                         goto authcommon;
 694                 case CRYPTO_SHA2_512_HMAC:
 695                         axf = &auth_hash_hmac_sha2_512;
 696                         goto authcommon;
 697                 case CRYPTO_NULL_HMAC:
 698                         axf = &auth_hash_null;
 699                         goto authcommon;
 700                 case CRYPTO_RIPEMD160_HMAC:
 701                         axf = &auth_hash_hmac_ripemd_160;
 702                 authcommon:
 703                         (*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA,
 704                             M_NOWAIT);
 705                         if ((*swd)->sw_ictx == NULL) {
 706                                 swcr_freesession(dev, i);
 707                                 return ENOBUFS;
 708                         }
 709
 710                         (*swd)->sw_octx = malloc(axf->ctxsize, M_CRYPTO_DATA,
 711                             M_NOWAIT);
 712                         if ((*swd)->sw_octx == NULL) {
 713                                 swcr_freesession(dev, i);
 714                                 return ENOBUFS;
 715                         }
 716
 717                         if (cri->cri_key != NULL) {
 718                                 swcr_authprepare(axf, *swd, cri->cri_key,
 719                                     cri->cri_klen);
 720                         }
 721
 722                         (*swd)->sw_mlen = cri->cri_mlen;
 723                         (*swd)->sw_axf = axf;
 724                         break;
 725
 726                 case CRYPTO_MD5_KPDK:
 727                         axf = &auth_hash_key_md5;
 728                         goto auth2common;
 729
 730                 case CRYPTO_SHA1_KPDK:
 731                         axf = &auth_hash_key_sha1;
 732                 auth2common:
 733                         (*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA,
 734                             M_NOWAIT);
 735                         if ((*swd)->sw_ictx == NULL) {
 736                                 swcr_freesession(dev, i);
 737                                 return ENOBUFS;
 738                         }
 739
 740                         (*swd)->sw_octx = malloc(cri->cri_klen / 8,
 741                             M_CRYPTO_DATA, M_NOWAIT);
 742                         if ((*swd)->sw_octx == NULL) {
 743                                 swcr_freesession(dev, i);
 744                                 return ENOBUFS;
 745                         }
 746
 747                         /* Store the key so we can "append" it to the payload */
 748                         if (cri->cri_key != NULL) {
 749                                 swcr_authprepare(axf, *swd, cri->cri_key,
 750                                     cri->cri_klen);
 751                         }
 752
 753                         (*swd)->sw_mlen = cri->cri_mlen;
 754                         (*swd)->sw_axf = axf;
 755                         break;
 756 #ifdef notdef
 757                 case CRYPTO_MD5:
 758                         axf = &auth_hash_md5;
 759                         goto auth3common;
 760
 761                 case CRYPTO_SHA1:
 762                         axf = &auth_hash_sha1;
 763                 auth3common:
 764                         (*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA,
 765                             M_NOWAIT);
 766                         if ((*swd)->sw_ictx == NULL) {
 767                                 swcr_freesession(dev, i);
 768                                 return ENOBUFS;
 769                         }
 770
 771                         axf->Init((*swd)->sw_ictx);
 772                         (*swd)->sw_mlen = cri->cri_mlen;
 773                         (*swd)->sw_axf = axf;
 774                         break;
 775 #endif
 776                 case CRYPTO_DEFLATE_COMP:
 777                         cxf = &comp_algo_deflate;
 778                         (*swd)->sw_cxf = cxf;
 779                         break;
 780                 default:
 781                         swcr_freesession(dev, i);
 782                         return EINVAL;
 783                 }
 784
 785                 (*swd)->sw_alg = cri->cri_alg;
 786                 cri = cri->cri_next;
 787                 swd = &((*swd)->sw_next);
 788         }
 789         return 0;
 790 }
 791
 792 /*
 793  * Free a session.
 794  */
 795 static int
 796 swcr_freesession(device_t dev, u_int64_t tid)
 797 {
 798         struct swcr_data *swd;
 799         struct enc_xform *txf;
 800         struct auth_hash *axf;
 801         struct comp_algo *cxf;
 802         u_int32_t sid = CRYPTO_SESID2LID(tid);
 803
 804         if (sid > swcr_sesnum || swcr_sessions == NULL ||
 805             swcr_sessions[sid] == NULL)
 806                 return EINVAL;
 807
 808         /* Silently accept and return */
 809         if (sid == 0)
 810                 return 0;
 811
 812         while ((swd = swcr_sessions[sid]) != NULL) {
 813                 swcr_sessions[sid] = swd->sw_next;
 814
 815                 switch (swd->sw_alg) {
 816                 case CRYPTO_DES_CBC:
 817                 case CRYPTO_3DES_CBC:
 818                 case CRYPTO_BLF_CBC:
 819                 case CRYPTO_CAST_CBC:
 820                 case CRYPTO_SKIPJACK_CBC:
 821                 case CRYPTO_RIJNDAEL128_CBC:
 822                 case CRYPTO_CAMELLIA_CBC:
 823                 case CRYPTO_NULL_CBC:
 824                         txf = swd->sw_exf;
 825
 826                         if (swd->sw_kschedule)
 827                                 txf->zerokey(&(swd->sw_kschedule));
 828                         break;
 829
 830                 case CRYPTO_MD5_HMAC:
 831                 case CRYPTO_SHA1_HMAC:
 832                 case CRYPTO_SHA2_256_HMAC:
 833                 case CRYPTO_SHA2_384_HMAC:
 834                 case CRYPTO_SHA2_512_HMAC:
 835                 case CRYPTO_RIPEMD160_HMAC:
 836                 case CRYPTO_NULL_HMAC:
 837                         axf = swd->sw_axf;
 838
 839                         if (swd->sw_ictx) {
 840                                 bzero(swd->sw_ictx, axf->ctxsize);
 841                                 free(swd->sw_ictx, M_CRYPTO_DATA);
 842                         }
 843                         if (swd->sw_octx) {
 844                                 bzero(swd->sw_octx, axf->ctxsize);
 845                                 free(swd->sw_octx, M_CRYPTO_DATA);
 846                         }
 847                         break;
 848
 849                 case CRYPTO_MD5_KPDK:
 850                 case CRYPTO_SHA1_KPDK:
 851                         axf = swd->sw_axf;
 852
 853                         if (swd->sw_ictx) {
 854                                 bzero(swd->sw_ictx, axf->ctxsize);
 855                                 free(swd->sw_ictx, M_CRYPTO_DATA);
 856                         }
 857                         if (swd->sw_octx) {
 858                                 bzero(swd->sw_octx, swd->sw_klen);
 859                                 free(swd->sw_octx, M_CRYPTO_DATA);
 860                         }
 861                         break;
 862
 863                 case CRYPTO_MD5:
 864                 case CRYPTO_SHA1:
 865                         axf = swd->sw_axf;
 866
 867                         if (swd->sw_ictx)
 868                                 free(swd->sw_ictx, M_CRYPTO_DATA);
 869                         break;
 870
 871                 case CRYPTO_DEFLATE_COMP:
 872                         cxf = swd->sw_cxf;
 873                         break;
 874                 }
 875
 876                 FREE(swd, M_CRYPTO_DATA);
 877         }
 878         return 0;
 879 }
 880
 881 /*
 882  * Process a software request.
 883  */
 884 static int
 885 swcr_process(device_t dev, struct cryptop *crp, int hint)
 886 {
 887         struct cryptodesc *crd;
 888         struct swcr_data *sw;
 889         u_int32_t lid;
 890
 891         /* Sanity check */
 892         if (crp == NULL)
 893                 return EINVAL;
 894
 895         if (crp->crp_desc == NULL || crp->crp_buf == NULL) {
 896                 crp->crp_etype = EINVAL;
 897                 goto done;
 898         }
 899
 900         lid = crp->crp_sid & 0xffffffff;
 901         if (lid >= swcr_sesnum || lid == 0 || swcr_sessions[lid] == NULL) {
 902                 crp->crp_etype = ENOENT;
 903                 goto done;
 904         }
 905
 906         /* Go through crypto descriptors, processing as we go */
 907         for (crd = crp->crp_desc; crd; crd = crd->crd_next) {
 908                 /*
 909                  * Find the crypto context.
 910                  *
 911                  * XXX Note that the logic here prevents us from having
 912                  * XXX the same algorithm multiple times in a session
 913                  * XXX (or rather, we can but it won't give us the right
 914                  * XXX results). To do that, we'd need some way of differentiating
 915                  * XXX between the various instances of an algorithm (so we can
 916                  * XXX locate the correct crypto context).
 917                  */
 918                 for (sw = swcr_sessions[lid];
 919                     sw && sw->sw_alg != crd->crd_alg;
 920                     sw = sw->sw_next)
 921                         ;
 922
 923                 /* No such context ? */
 924                 if (sw == NULL) {
 925                         crp->crp_etype = EINVAL;
 926                         goto done;
 927                 }
 928                 switch (sw->sw_alg) {
 929                 case CRYPTO_DES_CBC:
 930                 case CRYPTO_3DES_CBC:
 931                 case CRYPTO_BLF_CBC:
 932                 case CRYPTO_CAST_CBC:
 933                 case CRYPTO_SKIPJACK_CBC:
 934                 case CRYPTO_RIJNDAEL128_CBC:
 935                 case CRYPTO_CAMELLIA_CBC:
 936                         if ((crp->crp_etype = swcr_encdec(crd, sw,
 937                             crp->crp_buf, crp->crp_flags)) != 0)
 938                                 goto done;
 939                         break;
 940                 case CRYPTO_NULL_CBC:
 941                         crp->crp_etype = 0;
 942                         break;
 943                 case CRYPTO_MD5_HMAC:
 944                 case CRYPTO_SHA1_HMAC:
 945                 case CRYPTO_SHA2_256_HMAC:
 946                 case CRYPTO_SHA2_384_HMAC:
 947                 case CRYPTO_SHA2_512_HMAC:
 948                 case CRYPTO_RIPEMD160_HMAC:
 949                 case CRYPTO_NULL_HMAC:
 950                 case CRYPTO_MD5_KPDK:
 951                 case CRYPTO_SHA1_KPDK:
 952                 case CRYPTO_MD5:
 953                 case CRYPTO_SHA1:
 954                         if ((crp->crp_etype = swcr_authcompute(crd, sw,
 955                             crp->crp_buf, crp->crp_flags)) != 0)
 956                                 goto done;
 957                         break;
 958
 959                 case CRYPTO_DEFLATE_COMP:
 960                         if ((crp->crp_etype = swcr_compdec(crd, sw,
 961                             crp->crp_buf, crp->crp_flags)) != 0)
 962                                 goto done;
 963                         else
 964                                 crp->crp_olen = (int)sw->sw_size;
 965                         break;
 966
 967                 default:
 968                         /* Unknown/unsupported algorithm */
 969                         crp->crp_etype = EINVAL;
 970                         goto done;
 971                 }
 972         }
 973
 974 done:
 975         crypto_done(crp);
 976         return 0;
 977 }
 978
 979 static void
 980 swcr_identify(device_t *dev, device_t parent)
 981 {
 982         /* NB: order 10 is so we get attached after h/w devices */
 983         if (device_find_child(parent, "cryptosoft", -1) == NULL &&
 984             BUS_ADD_CHILD(parent, 10, "cryptosoft", -1) == 0)
 985                 panic("cryptosoft: could not attach");
 986 }
 987
 988 static int
 989 swcr_probe(device_t dev)
 990 {
 991         device_set_desc(dev, "software crypto");
 992         return (0);
 993 }
 994
 995 static int
 996 swcr_attach(device_t dev)
 997 {
 998         memset(hmac_ipad_buffer, HMAC_IPAD_VAL, HMAC_MAX_BLOCK_LEN);
 999         memset(hmac_opad_buffer, HMAC_OPAD_VAL, HMAC_MAX_BLOCK_LEN);
1000
1001         swcr_id = crypto_get_driverid(dev,
1002                         CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_SYNC);
1003         if (swcr_id < 0) {
1004                 device_printf(dev, "cannot initialize!");
1005                 return ENOMEM;
1006         }
1007 #define REGISTER(alg) \
1008         crypto_register(swcr_id, alg, 0,0)
1009         REGISTER(CRYPTO_DES_CBC);
1010         REGISTER(CRYPTO_3DES_CBC);
1011         REGISTER(CRYPTO_BLF_CBC);
1012         REGISTER(CRYPTO_CAST_CBC);
1013         REGISTER(CRYPTO_SKIPJACK_CBC);
1014         REGISTER(CRYPTO_NULL_CBC);
1015         REGISTER(CRYPTO_MD5_HMAC);
1016         REGISTER(CRYPTO_SHA1_HMAC);
1017         REGISTER(CRYPTO_SHA2_256_HMAC);
1018         REGISTER(CRYPTO_SHA2_384_HMAC);
1019         REGISTER(CRYPTO_SHA2_512_HMAC);
1020         REGISTER(CRYPTO_RIPEMD160_HMAC);
1021         REGISTER(CRYPTO_NULL_HMAC);
1022         REGISTER(CRYPTO_MD5_KPDK);
1023         REGISTER(CRYPTO_SHA1_KPDK);
1024         REGISTER(CRYPTO_MD5);
1025         REGISTER(CRYPTO_SHA1);
1026         REGISTER(CRYPTO_RIJNDAEL128_CBC);
1027         REGISTER(CRYPTO_CAMELLIA_CBC);
1028         REGISTER(CRYPTO_DEFLATE_COMP);
1029 #undef REGISTER
1030
1031         return 0;
1032 }
1033
1034 static void
1035 swcr_detach(device_t dev)
1036 {
1037         crypto_unregister_all(swcr_id);
1038         if (swcr_sessions != NULL)
1039                 FREE(swcr_sessions, M_CRYPTO_DATA);
1040 }
1041
1042 static device_method_t swcr_methods[] = {
1043         DEVMETHOD(device_identify,      swcr_identify),
1044         DEVMETHOD(device_probe,         swcr_probe),
1045         DEVMETHOD(device_attach,        swcr_attach),
1046         DEVMETHOD(device_detach,        swcr_detach),
1047
1048         DEVMETHOD(cryptodev_newsession, swcr_newsession),
1049         DEVMETHOD(cryptodev_freesession,swcr_freesession),
1050         DEVMETHOD(cryptodev_process,    swcr_process),
1051
1052         {0, 0},
1053 };
1054
1055 static driver_t swcr_driver = {
1056         "cryptosoft",
1057         swcr_methods,
1058         0,              /* NB: no softc */
1059 };
1060 static devclass_t swcr_devclass;
1061
1062 /*
1063  * NB: We explicitly reference the crypto module so we
1064  * get the necessary ordering when built as a loadable
1065  * module.  This is required because we bundle the crypto
1066  * module code together with the cryptosoft driver (otherwise
1067  * normal module dependencies would handle things).
1068  */
1069 extern int crypto_modevent(struct module *, int, void *);
1070 /* XXX where to attach */
1071 DRIVER_MODULE(cryptosoft, nexus, swcr_driver, swcr_devclass, crypto_modevent,0);
1072 MODULE_VERSION(cryptosoft, 1);
1073 MODULE_DEPEND(cryptosoft, crypto, 1, 1, 1);