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                         if (k == iov->iov_len) {
 356                                 iov++;
 357                                 k = 0;
 358                         }
 359                 }
 360
 361                 return 0; /* Done with iovec encryption/decryption */
 362         } else {        /* contiguous buffer */
 363                 if (crd->crd_flags & CRD_F_ENCRYPT) {
 364                         for (i = crd->crd_skip;
 365                             i < crd->crd_skip + crd->crd_len; i += blks) {
 366                                 /* XOR with the IV/previous block, as appropriate. */
 367                                 if (i == crd->crd_skip)
 368                                         for (k = 0; k < blks; k++)
 369                                                 buf[i + k] ^= ivp[k];
 370                                 else
 371                                         for (k = 0; k < blks; k++)
 372                                                 buf[i + k] ^= buf[i + k - blks];
 373                                 exf->encrypt(sw->sw_kschedule, buf + i);
 374                         }
 375                 } else {                /* Decrypt */
 376                         /*
 377                          * Start at the end, so we don't need to keep the encrypted
 378                          * block as the IV for the next block.
 379                          */
 380                         for (i = crd->crd_skip + crd->crd_len - blks;
 381                             i >= crd->crd_skip; i -= blks) {
 382                                 exf->decrypt(sw->sw_kschedule, buf + i);
 383
 384                                 /* XOR with the IV/previous block, as appropriate */
 385                                 if (i == crd->crd_skip)
 386                                         for (k = 0; k < blks; k++)
 387                                                 buf[i + k] ^= ivp[k];
 388                                 else
 389                                         for (k = 0; k < blks; k++)
 390                                                 buf[i + k] ^= buf[i + k - blks];
 391                         }
 392                 }
 393
 394                 return 0; /* Done with contiguous buffer encryption/decryption */
 395         }
 396
 397         /* Unreachable */
 398         return EINVAL;
 399 }
 400
 401 static void
 402 swcr_authprepare(struct auth_hash *axf, struct swcr_data *sw, u_char *key,
 403     int klen)
 404 {
 405         int k;
 406
 407         klen /= 8;
 408
 409         switch (axf->type) {
 410         case CRYPTO_MD5_HMAC:
 411         case CRYPTO_SHA1_HMAC:
 412         case CRYPTO_SHA2_256_HMAC:
 413         case CRYPTO_SHA2_384_HMAC:
 414         case CRYPTO_SHA2_512_HMAC:
 415         case CRYPTO_NULL_HMAC:
 416         case CRYPTO_RIPEMD160_HMAC:
 417                 for (k = 0; k < klen; k++)
 418                         key[k] ^= HMAC_IPAD_VAL;
 419
 420                 axf->Init(sw->sw_ictx);
 421                 axf->Update(sw->sw_ictx, key, klen);
 422                 axf->Update(sw->sw_ictx, hmac_ipad_buffer, axf->blocksize - klen);
 423
 424                 for (k = 0; k < klen; k++)
 425                         key[k] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL);
 426
 427                 axf->Init(sw->sw_octx);
 428                 axf->Update(sw->sw_octx, key, klen);
 429                 axf->Update(sw->sw_octx, hmac_opad_buffer, axf->blocksize - klen);
 430
 431                 for (k = 0; k < klen; k++)
 432                         key[k] ^= HMAC_OPAD_VAL;
 433                 break;
 434         case CRYPTO_MD5_KPDK:
 435         case CRYPTO_SHA1_KPDK:
 436         {
 437                 /* We need a buffer that can hold an md5 and a sha1 result. */
 438                 u_char buf[SHA1_RESULTLEN];
 439
 440                 sw->sw_klen = klen;
 441                 bcopy(key, sw->sw_octx, klen);
 442                 axf->Init(sw->sw_ictx);
 443                 axf->Update(sw->sw_ictx, key, klen);
 444                 axf->Final(buf, sw->sw_ictx);
 445                 break;
 446         }
 447         default:
 448                 printf("%s: CRD_F_KEY_EXPLICIT flag given, but algorithm %d "
 449                     "doesn't use keys.\n", __func__, axf->type);
 450         }
 451 }
 452
 453 /*
 454  * Compute keyed-hash authenticator.
 455  */
 456 static int
 457 swcr_authcompute(struct cryptodesc *crd, struct swcr_data *sw, caddr_t buf,
 458     int flags)
 459 {
 460         unsigned char aalg[HASH_MAX_LEN];
 461         struct auth_hash *axf;
 462         union authctx ctx;
 463         int err;
 464
 465         if (sw->sw_ictx == 0)
 466                 return EINVAL;
 467
 468         axf = sw->sw_axf;
 469
 470         if (crd->crd_flags & CRD_F_KEY_EXPLICIT)
 471                 swcr_authprepare(axf, sw, crd->crd_key, crd->crd_klen);
 472
 473         bcopy(sw->sw_ictx, &ctx, axf->ctxsize);
 474
 475         err = crypto_apply(flags, buf, crd->crd_skip, crd->crd_len,
 476             (int (*)(void *, void *, unsigned int))axf->Update, (caddr_t)&ctx);
 477         if (err)
 478                 return err;
 479
 480         switch (sw->sw_alg) {
 481         case CRYPTO_MD5_HMAC:
 482         case CRYPTO_SHA1_HMAC:
 483         case CRYPTO_SHA2_256_HMAC:
 484         case CRYPTO_SHA2_384_HMAC:
 485         case CRYPTO_SHA2_512_HMAC:
 486         case CRYPTO_RIPEMD160_HMAC:
 487                 if (sw->sw_octx == NULL)
 488                         return EINVAL;
 489
 490                 axf->Final(aalg, &ctx);
 491                 bcopy(sw->sw_octx, &ctx, axf->ctxsize);
 492                 axf->Update(&ctx, aalg, axf->hashsize);
 493                 axf->Final(aalg, &ctx);
 494                 break;
 495
 496         case CRYPTO_MD5_KPDK:
 497         case CRYPTO_SHA1_KPDK:
 498                 if (sw->sw_octx == NULL)
 499                         return EINVAL;
 500
 501                 axf->Update(&ctx, sw->sw_octx, sw->sw_klen);
 502                 axf->Final(aalg, &ctx);
 503                 break;
 504
 505         case CRYPTO_NULL_HMAC:
 506                 axf->Final(aalg, &ctx);
 507                 break;
 508         }
 509
 510         /* Inject the authentication data */
 511         crypto_copyback(flags, buf, crd->crd_inject,
 512             sw->sw_mlen == 0 ? axf->hashsize : sw->sw_mlen, aalg);
 513         return 0;
 514 }
 515
 516 /*
 517  * Apply a compression/decompression algorithm
 518  */
 519 static int
 520 swcr_compdec(struct cryptodesc *crd, struct swcr_data *sw,
 521     caddr_t buf, int flags)
 522 {
 523         u_int8_t *data, *out;
 524         struct comp_algo *cxf;
 525         int adj;
 526         u_int32_t result;
 527
 528         cxf = sw->sw_cxf;
 529
 530         /* We must handle the whole buffer of data in one time
 531          * then if there is not all the data in the mbuf, we must
 532          * copy in a buffer.
 533          */
 534
 535         data = malloc(crd->crd_len, M_CRYPTO_DATA,  M_NOWAIT);
 536         if (data == NULL)
 537                 return (EINVAL);
 538         crypto_copydata(flags, buf, crd->crd_skip, crd->crd_len, data);
 539
 540         if (crd->crd_flags & CRD_F_COMP)
 541                 result = cxf->compress(data, crd->crd_len, &out);
 542         else
 543                 result = cxf->decompress(data, crd->crd_len, &out);
 544
 545         free(data, M_CRYPTO_DATA);
 546         if (result == 0)
 547                 return EINVAL;
 548
 549         /* Copy back the (de)compressed data. m_copyback is
 550          * extending the mbuf as necessary.
 551          */
 552         sw->sw_size = result;
 553         /* Check the compressed size when doing compression */
 554         if (crd->crd_flags & CRD_F_COMP) {
 555                 if (result > crd->crd_len) {
 556                         /* Compression was useless, we lost time */
 557                         free(out, M_CRYPTO_DATA);
 558                         return 0;
 559                 }
 560         }
 561
 562         crypto_copyback(flags, buf, crd->crd_skip, result, out);
 563         if (result < crd->crd_len) {
 564                 adj = result - crd->crd_len;
 565                 if (flags & CRYPTO_F_IMBUF) {
 566                         adj = result - crd->crd_len;
 567                         m_adj((struct mbuf *)buf, adj);
 568                 } else if (flags & CRYPTO_F_IOV) {
 569                         struct uio *uio = (struct uio *)buf;
 570                         int ind;
 571
 572                         adj = crd->crd_len - result;
 573                         ind = uio->uio_iovcnt - 1;
 574
 575                         while (adj > 0 && ind >= 0) {
 576                                 if (adj < uio->uio_iov[ind].iov_len) {
 577                                         uio->uio_iov[ind].iov_len -= adj;
 578                                         break;
 579                                 }
 580
 581                                 adj -= uio->uio_iov[ind].iov_len;
 582                                 uio->uio_iov[ind].iov_len = 0;
 583                                 ind--;
 584                                 uio->uio_iovcnt--;
 585                         }
 586                 }
 587         }
 588         free(out, M_CRYPTO_DATA);
 589         return 0;
 590 }
 591
 592 /*
 593  * Generate a new software session.
 594  */
 595 static int
 596 swcr_newsession(device_t dev, u_int32_t *sid, struct cryptoini *cri)
 597 {
 598         struct swcr_data **swd;
 599         struct auth_hash *axf;
 600         struct enc_xform *txf;
 601         struct comp_algo *cxf;
 602         u_int32_t i;
 603         int error;
 604
 605         if (sid == NULL || cri == NULL)
 606                 return EINVAL;
 607
 608         if (swcr_sessions) {
 609                 for (i = 1; i < swcr_sesnum; i++)
 610                         if (swcr_sessions[i] == NULL)
 611                                 break;
 612         } else
 613                 i = 1;          /* NB: to silence compiler warning */
 614
 615         if (swcr_sessions == NULL || i == swcr_sesnum) {
 616                 if (swcr_sessions == NULL) {
 617                         i = 1; /* We leave swcr_sessions[0] empty */
 618                         swcr_sesnum = CRYPTO_SW_SESSIONS;
 619                 } else
 620                         swcr_sesnum *= 2;
 621
 622                 swd = malloc(swcr_sesnum * sizeof(struct swcr_data *),
 623                     M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
 624                 if (swd == NULL) {
 625                         /* Reset session number */
 626                         if (swcr_sesnum == CRYPTO_SW_SESSIONS)
 627                                 swcr_sesnum = 0;
 628                         else
 629                                 swcr_sesnum /= 2;
 630                         return ENOBUFS;
 631                 }
 632
 633                 /* Copy existing sessions */
 634                 if (swcr_sessions != NULL) {
 635                         bcopy(swcr_sessions, swd,
 636                             (swcr_sesnum / 2) * sizeof(struct swcr_data *));
 637                         free(swcr_sessions, M_CRYPTO_DATA);
 638                 }
 639
 640                 swcr_sessions = swd;
 641         }
 642
 643         swd = &swcr_sessions[i];
 644         *sid = i;
 645
 646         while (cri) {
 647                 *swd = malloc(sizeof(struct swcr_data),
 648                     M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
 649                 if (*swd == NULL) {
 650                         swcr_freesession(dev, i);
 651                         return ENOBUFS;
 652                 }
 653
 654                 switch (cri->cri_alg) {
 655                 case CRYPTO_DES_CBC:
 656                         txf = &enc_xform_des;
 657                         goto enccommon;
 658                 case CRYPTO_3DES_CBC:
 659                         txf = &enc_xform_3des;
 660                         goto enccommon;
 661                 case CRYPTO_BLF_CBC:
 662                         txf = &enc_xform_blf;
 663                         goto enccommon;
 664                 case CRYPTO_CAST_CBC:
 665                         txf = &enc_xform_cast5;
 666                         goto enccommon;
 667                 case CRYPTO_SKIPJACK_CBC:
 668                         txf = &enc_xform_skipjack;
 669                         goto enccommon;
 670                 case CRYPTO_RIJNDAEL128_CBC:
 671                         txf = &enc_xform_rijndael128;
 672                         goto enccommon;
 673                 case CRYPTO_CAMELLIA_CBC:
 674                         txf = &enc_xform_camellia;
 675                         goto enccommon;
 676                 case CRYPTO_NULL_CBC:
 677                         txf = &enc_xform_null;
 678                         goto enccommon;
 679                 enccommon:
 680                         if (cri->cri_key != NULL) {
 681                                 error = txf->setkey(&((*swd)->sw_kschedule),
 682                                     cri->cri_key, cri->cri_klen / 8);
 683                                 if (error) {
 684                                         swcr_freesession(dev, i);
 685                                         return error;
 686                                 }
 687                         }
 688                         (*swd)->sw_exf = txf;
 689                         break;
 690
 691                 case CRYPTO_MD5_HMAC:
 692                         axf = &auth_hash_hmac_md5;
 693                         goto authcommon;
 694                 case CRYPTO_SHA1_HMAC:
 695                         axf = &auth_hash_hmac_sha1;
 696                         goto authcommon;
 697                 case CRYPTO_SHA2_256_HMAC:
 698                         axf = &auth_hash_hmac_sha2_256;
 699                         goto authcommon;
 700                 case CRYPTO_SHA2_384_HMAC:
 701                         axf = &auth_hash_hmac_sha2_384;
 702                         goto authcommon;
 703                 case CRYPTO_SHA2_512_HMAC:
 704                         axf = &auth_hash_hmac_sha2_512;
 705                         goto authcommon;
 706                 case CRYPTO_NULL_HMAC:
 707                         axf = &auth_hash_null;
 708                         goto authcommon;
 709                 case CRYPTO_RIPEMD160_HMAC:
 710                         axf = &auth_hash_hmac_ripemd_160;
 711                 authcommon:
 712                         (*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA,
 713                             M_NOWAIT);
 714                         if ((*swd)->sw_ictx == NULL) {
 715                                 swcr_freesession(dev, i);
 716                                 return ENOBUFS;
 717                         }
 718
 719                         (*swd)->sw_octx = malloc(axf->ctxsize, M_CRYPTO_DATA,
 720                             M_NOWAIT);
 721                         if ((*swd)->sw_octx == NULL) {
 722                                 swcr_freesession(dev, i);
 723                                 return ENOBUFS;
 724                         }
 725
 726                         if (cri->cri_key != NULL) {
 727                                 swcr_authprepare(axf, *swd, cri->cri_key,
 728                                     cri->cri_klen);
 729                         }
 730
 731                         (*swd)->sw_mlen = cri->cri_mlen;
 732                         (*swd)->sw_axf = axf;
 733                         break;
 734
 735                 case CRYPTO_MD5_KPDK:
 736                         axf = &auth_hash_key_md5;
 737                         goto auth2common;
 738
 739                 case CRYPTO_SHA1_KPDK:
 740                         axf = &auth_hash_key_sha1;
 741                 auth2common:
 742                         (*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA,
 743                             M_NOWAIT);
 744                         if ((*swd)->sw_ictx == NULL) {
 745                                 swcr_freesession(dev, i);
 746                                 return ENOBUFS;
 747                         }
 748
 749                         (*swd)->sw_octx = malloc(cri->cri_klen / 8,
 750                             M_CRYPTO_DATA, M_NOWAIT);
 751                         if ((*swd)->sw_octx == NULL) {
 752                                 swcr_freesession(dev, i);
 753                                 return ENOBUFS;
 754                         }
 755
 756                         /* Store the key so we can "append" it to the payload */
 757                         if (cri->cri_key != NULL) {
 758                                 swcr_authprepare(axf, *swd, cri->cri_key,
 759                                     cri->cri_klen);
 760                         }
 761
 762                         (*swd)->sw_mlen = cri->cri_mlen;
 763                         (*swd)->sw_axf = axf;
 764                         break;
 765 #ifdef notdef
 766                 case CRYPTO_MD5:
 767                         axf = &auth_hash_md5;
 768                         goto auth3common;
 769
 770                 case CRYPTO_SHA1:
 771                         axf = &auth_hash_sha1;
 772                 auth3common:
 773                         (*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA,
 774                             M_NOWAIT);
 775                         if ((*swd)->sw_ictx == NULL) {
 776                                 swcr_freesession(dev, i);
 777                                 return ENOBUFS;
 778                         }
 779
 780                         axf->Init((*swd)->sw_ictx);
 781                         (*swd)->sw_mlen = cri->cri_mlen;
 782                         (*swd)->sw_axf = axf;
 783                         break;
 784 #endif
 785                 case CRYPTO_DEFLATE_COMP:
 786                         cxf = &comp_algo_deflate;
 787                         (*swd)->sw_cxf = cxf;
 788                         break;
 789                 default:
 790                         swcr_freesession(dev, i);
 791                         return EINVAL;
 792                 }
 793
 794                 (*swd)->sw_alg = cri->cri_alg;
 795                 cri = cri->cri_next;
 796                 swd = &((*swd)->sw_next);
 797         }
 798         return 0;
 799 }
 800
 801 /*
 802  * Free a session.
 803  */
 804 static int
 805 swcr_freesession(device_t dev, u_int64_t tid)
 806 {
 807         struct swcr_data *swd;
 808         struct enc_xform *txf;
 809         struct auth_hash *axf;
 810         struct comp_algo *cxf;
 811         u_int32_t sid = CRYPTO_SESID2LID(tid);
 812
 813         if (sid > swcr_sesnum || swcr_sessions == NULL ||
 814             swcr_sessions[sid] == NULL)
 815                 return EINVAL;
 816
 817         /* Silently accept and return */
 818         if (sid == 0)
 819                 return 0;
 820
 821         while ((swd = swcr_sessions[sid]) != NULL) {
 822                 swcr_sessions[sid] = swd->sw_next;
 823
 824                 switch (swd->sw_alg) {
 825                 case CRYPTO_DES_CBC:
 826                 case CRYPTO_3DES_CBC:
 827                 case CRYPTO_BLF_CBC:
 828                 case CRYPTO_CAST_CBC:
 829                 case CRYPTO_SKIPJACK_CBC:
 830                 case CRYPTO_RIJNDAEL128_CBC:
 831                 case CRYPTO_CAMELLIA_CBC:
 832                 case CRYPTO_NULL_CBC:
 833                         txf = swd->sw_exf;
 834
 835                         if (swd->sw_kschedule)
 836                                 txf->zerokey(&(swd->sw_kschedule));
 837                         break;
 838
 839                 case CRYPTO_MD5_HMAC:
 840                 case CRYPTO_SHA1_HMAC:
 841                 case CRYPTO_SHA2_256_HMAC:
 842                 case CRYPTO_SHA2_384_HMAC:
 843                 case CRYPTO_SHA2_512_HMAC:
 844                 case CRYPTO_RIPEMD160_HMAC:
 845                 case CRYPTO_NULL_HMAC:
 846                         axf = swd->sw_axf;
 847
 848                         if (swd->sw_ictx) {
 849                                 bzero(swd->sw_ictx, axf->ctxsize);
 850                                 free(swd->sw_ictx, M_CRYPTO_DATA);
 851                         }
 852                         if (swd->sw_octx) {
 853                                 bzero(swd->sw_octx, axf->ctxsize);
 854                                 free(swd->sw_octx, M_CRYPTO_DATA);
 855                         }
 856                         break;
 857
 858                 case CRYPTO_MD5_KPDK:
 859                 case CRYPTO_SHA1_KPDK:
 860                         axf = swd->sw_axf;
 861
 862                         if (swd->sw_ictx) {
 863                                 bzero(swd->sw_ictx, axf->ctxsize);
 864                                 free(swd->sw_ictx, M_CRYPTO_DATA);
 865                         }
 866                         if (swd->sw_octx) {
 867                                 bzero(swd->sw_octx, swd->sw_klen);
 868                                 free(swd->sw_octx, M_CRYPTO_DATA);
 869                         }
 870                         break;
 871
 872                 case CRYPTO_MD5:
 873                 case CRYPTO_SHA1:
 874                         axf = swd->sw_axf;
 875
 876                         if (swd->sw_ictx)
 877                                 free(swd->sw_ictx, M_CRYPTO_DATA);
 878                         break;
 879
 880                 case CRYPTO_DEFLATE_COMP:
 881                         cxf = swd->sw_cxf;
 882                         break;
 883                 }
 884
 885                 free(swd, M_CRYPTO_DATA);
 886         }
 887         return 0;
 888 }
 889
 890 /*
 891  * Process a software request.
 892  */
 893 static int
 894 swcr_process(device_t dev, struct cryptop *crp, int hint)
 895 {
 896         struct cryptodesc *crd;
 897         struct swcr_data *sw;
 898         u_int32_t lid;
 899
 900         /* Sanity check */
 901         if (crp == NULL)
 902                 return EINVAL;
 903
 904         if (crp->crp_desc == NULL || crp->crp_buf == NULL) {
 905                 crp->crp_etype = EINVAL;
 906                 goto done;
 907         }
 908
 909         lid = crp->crp_sid & 0xffffffff;
 910         if (lid >= swcr_sesnum || lid == 0 || swcr_sessions[lid] == NULL) {
 911                 crp->crp_etype = ENOENT;
 912                 goto done;
 913         }
 914
 915         /* Go through crypto descriptors, processing as we go */
 916         for (crd = crp->crp_desc; crd; crd = crd->crd_next) {
 917                 /*
 918                  * Find the crypto context.
 919                  *
 920                  * XXX Note that the logic here prevents us from having
 921                  * XXX the same algorithm multiple times in a session
 922                  * XXX (or rather, we can but it won't give us the right
 923                  * XXX results). To do that, we'd need some way of differentiating
 924                  * XXX between the various instances of an algorithm (so we can
 925                  * XXX locate the correct crypto context).
 926                  */
 927                 for (sw = swcr_sessions[lid];
 928                     sw && sw->sw_alg != crd->crd_alg;
 929                     sw = sw->sw_next)
 930                         ;
 931
 932                 /* No such context ? */
 933                 if (sw == NULL) {
 934                         crp->crp_etype = EINVAL;
 935                         goto done;
 936                 }
 937                 switch (sw->sw_alg) {
 938                 case CRYPTO_DES_CBC:
 939                 case CRYPTO_3DES_CBC:
 940                 case CRYPTO_BLF_CBC:
 941                 case CRYPTO_CAST_CBC:
 942                 case CRYPTO_SKIPJACK_CBC:
 943                 case CRYPTO_RIJNDAEL128_CBC:
 944                 case CRYPTO_CAMELLIA_CBC:
 945                         if ((crp->crp_etype = swcr_encdec(crd, sw,
 946                             crp->crp_buf, crp->crp_flags)) != 0)
 947                                 goto done;
 948                         break;
 949                 case CRYPTO_NULL_CBC:
 950                         crp->crp_etype = 0;
 951                         break;
 952                 case CRYPTO_MD5_HMAC:
 953                 case CRYPTO_SHA1_HMAC:
 954                 case CRYPTO_SHA2_256_HMAC:
 955                 case CRYPTO_SHA2_384_HMAC:
 956                 case CRYPTO_SHA2_512_HMAC:
 957                 case CRYPTO_RIPEMD160_HMAC:
 958                 case CRYPTO_NULL_HMAC:
 959                 case CRYPTO_MD5_KPDK:
 960                 case CRYPTO_SHA1_KPDK:
 961                 case CRYPTO_MD5:
 962                 case CRYPTO_SHA1:
 963                         if ((crp->crp_etype = swcr_authcompute(crd, sw,
 964                             crp->crp_buf, crp->crp_flags)) != 0)
 965                                 goto done;
 966                         break;
 967
 968                 case CRYPTO_DEFLATE_COMP:
 969                         if ((crp->crp_etype = swcr_compdec(crd, sw,
 970                             crp->crp_buf, crp->crp_flags)) != 0)
 971                                 goto done;
 972                         else
 973                                 crp->crp_olen = (int)sw->sw_size;
 974                         break;
 975
 976                 default:
 977                         /* Unknown/unsupported algorithm */
 978                         crp->crp_etype = EINVAL;
 979                         goto done;
 980                 }
 981         }
 982
 983 done:
 984         crypto_done(crp);
 985         return 0;
 986 }
 987
 988 static void
 989 swcr_identify(driver_t *drv, device_t parent)
 990 {
 991         /* NB: order 10 is so we get attached after h/w devices */
 992         if (device_find_child(parent, "cryptosoft", -1) == NULL &&
 993             BUS_ADD_CHILD(parent, 10, "cryptosoft", -1) == 0)
 994                 panic("cryptosoft: could not attach");
 995 }
 996
 997 static int
 998 swcr_probe(device_t dev)
 999 {
1000         device_set_desc(dev, "software crypto");
1001         return (0);
1002 }
1003
1004 static int
1005 swcr_attach(device_t dev)
1006 {
1007         memset(hmac_ipad_buffer, HMAC_IPAD_VAL, HMAC_MAX_BLOCK_LEN);
1008         memset(hmac_opad_buffer, HMAC_OPAD_VAL, HMAC_MAX_BLOCK_LEN);
1009
1010         swcr_id = crypto_get_driverid(dev,
1011                         CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_SYNC);
1012         if (swcr_id < 0) {
1013                 device_printf(dev, "cannot initialize!");
1014                 return ENOMEM;
1015         }
1016 #define REGISTER(alg) \
1017         crypto_register(swcr_id, alg, 0,0)
1018         REGISTER(CRYPTO_DES_CBC);
1019         REGISTER(CRYPTO_3DES_CBC);
1020         REGISTER(CRYPTO_BLF_CBC);
1021         REGISTER(CRYPTO_CAST_CBC);
1022         REGISTER(CRYPTO_SKIPJACK_CBC);
1023         REGISTER(CRYPTO_NULL_CBC);
1024         REGISTER(CRYPTO_MD5_HMAC);
1025         REGISTER(CRYPTO_SHA1_HMAC);
1026         REGISTER(CRYPTO_SHA2_256_HMAC);
1027         REGISTER(CRYPTO_SHA2_384_HMAC);
1028         REGISTER(CRYPTO_SHA2_512_HMAC);
1029         REGISTER(CRYPTO_RIPEMD160_HMAC);
1030         REGISTER(CRYPTO_NULL_HMAC);
1031         REGISTER(CRYPTO_MD5_KPDK);
1032         REGISTER(CRYPTO_SHA1_KPDK);
1033         REGISTER(CRYPTO_MD5);
1034         REGISTER(CRYPTO_SHA1);
1035         REGISTER(CRYPTO_RIJNDAEL128_CBC);
1036         REGISTER(CRYPTO_CAMELLIA_CBC);
1037         REGISTER(CRYPTO_DEFLATE_COMP);
1038 #undef REGISTER
1039
1040         return 0;
1041 }
1042
1043 static int
1044 swcr_detach(device_t dev)
1045 {
1046         crypto_unregister_all(swcr_id);
1047         if (swcr_sessions != NULL)
1048                 free(swcr_sessions, M_CRYPTO_DATA);
1049         return 0;
1050 }
1051
1052 static device_method_t swcr_methods[] = {
1053         DEVMETHOD(device_identify,      swcr_identify),
1054         DEVMETHOD(device_probe,         swcr_probe),
1055         DEVMETHOD(device_attach,        swcr_attach),
1056         DEVMETHOD(device_detach,        swcr_detach),
1057
1058         DEVMETHOD(cryptodev_newsession, swcr_newsession),
1059         DEVMETHOD(cryptodev_freesession,swcr_freesession),
1060         DEVMETHOD(cryptodev_process,    swcr_process),
1061
1062         {0, 0},
1063 };
1064
1065 static driver_t swcr_driver = {
1066         "cryptosoft",
1067         swcr_methods,
1068         0,              /* NB: no softc */
1069 };
1070 static devclass_t swcr_devclass;
1071
1072 /*
1073  * NB: We explicitly reference the crypto module so we
1074  * get the necessary ordering when built as a loadable
1075  * module.  This is required because we bundle the crypto
1076  * module code together with the cryptosoft driver (otherwise
1077  * normal module dependencies would handle things).
1078  */
1079 extern int crypto_modevent(struct module *, int, void *);
1080 /* XXX where to attach */
1081 DRIVER_MODULE(cryptosoft, nexus, swcr_driver, swcr_devclass, crypto_modevent,0);
1082 MODULE_VERSION(cryptosoft, 1);
1083 MODULE_DEPEND(cryptosoft, crypto, 1, 1, 1);