crypto/vmac.c

   1 /*
   2  * Modified to interface to the Linux kernel
   3  * Copyright (c) 2009, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 /* --------------------------------------------------------------------------
  20  * VMAC and VHASH Implementation by Ted Krovetz (tdk@acm.org) and Wei Dai.
  21  * This implementation is herby placed in the public domain.
  22  * The authors offers no warranty. Use at your own risk.
  23  * Please send bug reports to the authors.
  24  * Last modified: 17 APR 08, 1700 PDT
  25  * ----------------------------------------------------------------------- */
  26
  27 #include <linux/init.h>
  28 #include <linux/types.h>
  29 #include <linux/crypto.h>
  30 #include <linux/scatterlist.h>
  31 #include <asm/byteorder.h>
  32 #include <crypto/scatterwalk.h>
  33 #include <crypto/vmac.h>
  34 #include <crypto/internal/hash.h>
  35
  36 /*
  37  * Constants and masks
  38  */
  39 #define UINT64_C(x) x##ULL
  40 const u64 p64   = UINT64_C(0xfffffffffffffeff);  /* 2^64 - 257 prime  */
  41 const u64 m62   = UINT64_C(0x3fffffffffffffff);  /* 62-bit mask       */
  42 const u64 m63   = UINT64_C(0x7fffffffffffffff);  /* 63-bit mask       */
  43 const u64 m64   = UINT64_C(0xffffffffffffffff);  /* 64-bit mask       */
  44 const u64 mpoly = UINT64_C(0x1fffffff1fffffff);  /* Poly key mask     */
  45
  46 #ifdef __LITTLE_ENDIAN
  47 #define INDEX_HIGH 1
  48 #define INDEX_LOW 0
  49 #else
  50 #define INDEX_HIGH 0
  51 #define INDEX_LOW 1
  52 #endif
  53
  54 /*
  55  * The following routines are used in this implementation. They are
  56  * written via macros to simulate zero-overhead call-by-reference.
  57  *
  58  * MUL64: 64x64->128-bit multiplication
  59  * PMUL64: assumes top bits cleared on inputs
  60  * ADD128: 128x128->128-bit addition
  61  */
  62
  63 #define ADD128(rh, rl, ih, il)                                          \
  64         do {                                                            \
  65                 u64 _il = (il);                                         \
  66                 (rl) += (_il);                                          \
  67                 if ((rl) < (_il))                                       \
  68                         (rh)++;                                         \
  69                 (rh) += (ih);                                           \
  70         } while (0)
  71
  72 #define MUL32(i1, i2)   ((u64)(u32)(i1)*(u32)(i2))
  73
  74 #define PMUL64(rh, rl, i1, i2)  /* Assumes m doesn't overflow */        \
  75         do {                                                            \
  76                 u64 _i1 = (i1), _i2 = (i2);                             \
  77                 u64 m = MUL32(_i1, _i2>>32) + MUL32(_i1>>32, _i2);      \
  78                 rh = MUL32(_i1>>32, _i2>>32);                           \
  79                 rl = MUL32(_i1, _i2);                                   \
  80                 ADD128(rh, rl, (m >> 32), (m << 32));                   \
  81         } while (0)
  82
  83 #define MUL64(rh, rl, i1, i2)                                           \
  84         do {                                                            \
  85                 u64 _i1 = (i1), _i2 = (i2);                             \
  86                 u64 m1 = MUL32(_i1, _i2>>32);                           \
  87                 u64 m2 = MUL32(_i1>>32, _i2);                           \
  88                 rh = MUL32(_i1>>32, _i2>>32);                           \
  89                 rl = MUL32(_i1, _i2);                                   \
  90                 ADD128(rh, rl, (m1 >> 32), (m1 << 32));                 \
  91                 ADD128(rh, rl, (m2 >> 32), (m2 << 32));                 \
  92         } while (0)
  93
  94 /*
  95  * For highest performance the L1 NH and L2 polynomial hashes should be
  96  * carefully implemented to take advantage of one's target architechture.
  97  * Here these two hash functions are defined multiple time; once for
  98  * 64-bit architectures, once for 32-bit SSE2 architectures, and once
  99  * for the rest (32-bit) architectures.
 100  * For each, nh_16 *must* be defined (works on multiples of 16 bytes).
 101  * Optionally, nh_vmac_nhbytes can be defined (for multiples of
 102  * VMAC_NHBYTES), and nh_16_2 and nh_vmac_nhbytes_2 (versions that do two
 103  * NH computations at once).
 104  */
 105
 106 #ifdef CONFIG_64BIT
 107
 108 #define nh_16(mp, kp, nw, rh, rl)                                       \
 109         do {                                                            \
 110                 int i; u64 th, tl;                                      \
 111                 rh = rl = 0;                                            \
 112                 for (i = 0; i < nw; i += 2) {                           \
 113                         MUL64(th, tl, le64_to_cpup((mp)+i)+(kp)[i],     \
 114                                 le64_to_cpup((mp)+i+1)+(kp)[i+1]);      \
 115                         ADD128(rh, rl, th, tl);                         \
 116                 }                                                       \
 117         } while (0)
 118
 119 #define nh_16_2(mp, kp, nw, rh, rl, rh1, rl1)                           \
 120         do {                                                            \
 121                 int i; u64 th, tl;                                      \
 122                 rh1 = rl1 = rh = rl = 0;                                \
 123                 for (i = 0; i < nw; i += 2) {                           \
 124                         MUL64(th, tl, le64_to_cpup((mp)+i)+(kp)[i],     \
 125                                 le64_to_cpup((mp)+i+1)+(kp)[i+1]);      \
 126                         ADD128(rh, rl, th, tl);                         \
 127                         MUL64(th, tl, le64_to_cpup((mp)+i)+(kp)[i+2],   \
 128                                 le64_to_cpup((mp)+i+1)+(kp)[i+3]);      \
 129                         ADD128(rh1, rl1, th, tl);                       \
 130                 }                                                       \
 131         } while (0)
 132
 133 #if (VMAC_NHBYTES >= 64) /* These versions do 64-bytes of message at a time */
 134 #define nh_vmac_nhbytes(mp, kp, nw, rh, rl)                             \
 135         do {                                                            \
 136                 int i; u64 th, tl;                                      \
 137                 rh = rl = 0;                                            \
 138                 for (i = 0; i < nw; i += 8) {                           \
 139                         MUL64(th, tl, le64_to_cpup((mp)+i)+(kp)[i],     \
 140                                 le64_to_cpup((mp)+i+1)+(kp)[i+1]);      \
 141                         ADD128(rh, rl, th, tl);                         \
 142                         MUL64(th, tl, le64_to_cpup((mp)+i+2)+(kp)[i+2], \
 143                                 le64_to_cpup((mp)+i+3)+(kp)[i+3]);      \
 144                         ADD128(rh, rl, th, tl);                         \
 145                         MUL64(th, tl, le64_to_cpup((mp)+i+4)+(kp)[i+4], \
 146                                 le64_to_cpup((mp)+i+5)+(kp)[i+5]);      \
 147                         ADD128(rh, rl, th, tl);                         \
 148                         MUL64(th, tl, le64_to_cpup((mp)+i+6)+(kp)[i+6], \
 149                                 le64_to_cpup((mp)+i+7)+(kp)[i+7]);      \
 150                         ADD128(rh, rl, th, tl);                         \
 151                 }                                                       \
 152         } while (0)
 153
 154 #define nh_vmac_nhbytes_2(mp, kp, nw, rh, rl, rh1, rl1)                 \
 155         do {                                                            \
 156                 int i; u64 th, tl;                                      \
 157                 rh1 = rl1 = rh = rl = 0;                                \
 158                 for (i = 0; i < nw; i += 8) {                           \
 159                         MUL64(th, tl, le64_to_cpup((mp)+i)+(kp)[i],     \
 160                                 le64_to_cpup((mp)+i+1)+(kp)[i+1]);      \
 161                         ADD128(rh, rl, th, tl);                         \
 162                         MUL64(th, tl, le64_to_cpup((mp)+i)+(kp)[i+2],   \
 163                                 le64_to_cpup((mp)+i+1)+(kp)[i+3]);      \
 164                         ADD128(rh1, rl1, th, tl);                       \
 165                         MUL64(th, tl, le64_to_cpup((mp)+i+2)+(kp)[i+2], \
 166                                 le64_to_cpup((mp)+i+3)+(kp)[i+3]);      \
 167                         ADD128(rh, rl, th, tl);                         \
 168                         MUL64(th, tl, le64_to_cpup((mp)+i+2)+(kp)[i+4], \
 169                                 le64_to_cpup((mp)+i+3)+(kp)[i+5]);      \
 170                         ADD128(rh1, rl1, th, tl);                       \
 171                         MUL64(th, tl, le64_to_cpup((mp)+i+4)+(kp)[i+4], \
 172                                 le64_to_cpup((mp)+i+5)+(kp)[i+5]);      \
 173                         ADD128(rh, rl, th, tl);                         \
 174                         MUL64(th, tl, le64_to_cpup((mp)+i+4)+(kp)[i+6], \
 175                                 le64_to_cpup((mp)+i+5)+(kp)[i+7]);      \
 176                         ADD128(rh1, rl1, th, tl);                       \
 177                         MUL64(th, tl, le64_to_cpup((mp)+i+6)+(kp)[i+6], \
 178                                 le64_to_cpup((mp)+i+7)+(kp)[i+7]);      \
 179                         ADD128(rh, rl, th, tl);                         \
 180                         MUL64(th, tl, le64_to_cpup((mp)+i+6)+(kp)[i+8], \
 181                                 le64_to_cpup((mp)+i+7)+(kp)[i+9]);      \
 182                         ADD128(rh1, rl1, th, tl);                       \
 183                 }                                                       \
 184         } while (0)
 185 #endif
 186
 187 #define poly_step(ah, al, kh, kl, mh, ml)                               \
 188         do {                                                            \
 189                 u64 t1h, t1l, t2h, t2l, t3h, t3l, z = 0;                \
 190                 /* compute ab*cd, put bd into result registers */       \
 191                 PMUL64(t3h, t3l, al, kh);                               \
 192                 PMUL64(t2h, t2l, ah, kl);                               \
 193                 PMUL64(t1h, t1l, ah, 2*kh);                             \
 194                 PMUL64(ah, al, al, kl);                                 \
 195                 /* add 2 * ac to result */                              \
 196                 ADD128(ah, al, t1h, t1l);                               \
 197                 /* add together ad + bc */                              \
 198                 ADD128(t2h, t2l, t3h, t3l);                             \
 199                 /* now (ah,al), (t2l,2*t2h) need summing */             \
 200                 /* first add the high registers, carrying into t2h */   \
 201                 ADD128(t2h, ah, z, t2l);                                \
 202                 /* double t2h and add top bit of ah */                  \
 203                 t2h = 2 * t2h + (ah >> 63);                             \
 204                 ah &= m63;                                              \
 205                 /* now add the low registers */                         \
 206                 ADD128(ah, al, mh, ml);                                 \
 207                 ADD128(ah, al, z, t2h);                                 \
 208         } while (0)
 209
 210 #else /* ! CONFIG_64BIT */
 211
 212 #ifndef nh_16
 213 #define nh_16(mp, kp, nw, rh, rl)                                       \
 214         do {                                                            \
 215                 u64 t1, t2, m1, m2, t;                                  \
 216                 int i;                                                  \
 217                 rh = rl = t = 0;                                        \
 218                 for (i = 0; i < nw; i += 2)  {                          \
 219                         t1 = le64_to_cpup(mp+i) + kp[i];                \
 220                         t2 = le64_to_cpup(mp+i+1) + kp[i+1];            \
 221                         m2 = MUL32(t1 >> 32, t2);                       \
 222                         m1 = MUL32(t1, t2 >> 32);                       \
 223                         ADD128(rh, rl, MUL32(t1 >> 32, t2 >> 32),       \
 224                                 MUL32(t1, t2));                         \
 225                         rh += (u64)(u32)(m1 >> 32)                      \
 226                                 + (u32)(m2 >> 32);                      \
 227                         t += (u64)(u32)m1 + (u32)m2;                    \
 228                 }                                                       \
 229                 ADD128(rh, rl, (t >> 32), (t << 32));                   \
 230         } while (0)
 231 #endif
 232
 233 static void poly_step_func(u64 *ahi, u64 *alo,
 234                         const u64 *kh, const u64 *kl,
 235                         const u64 *mh, const u64 *ml)
 236 {
 237 #define a0 (*(((u32 *)alo)+INDEX_LOW))
 238 #define a1 (*(((u32 *)alo)+INDEX_HIGH))
 239 #define a2 (*(((u32 *)ahi)+INDEX_LOW))
 240 #define a3 (*(((u32 *)ahi)+INDEX_HIGH))
 241 #define k0 (*(((u32 *)kl)+INDEX_LOW))
 242 #define k1 (*(((u32 *)kl)+INDEX_HIGH))
 243 #define k2 (*(((u32 *)kh)+INDEX_LOW))
 244 #define k3 (*(((u32 *)kh)+INDEX_HIGH))
 245
 246         u64 p, q, t;
 247         u32 t2;
 248
 249         p = MUL32(a3, k3);
 250         p += p;
 251         p += *(u64 *)mh;
 252         p += MUL32(a0, k2);
 253         p += MUL32(a1, k1);
 254         p += MUL32(a2, k0);
 255         t = (u32)(p);
 256         p >>= 32;
 257         p += MUL32(a0, k3);
 258         p += MUL32(a1, k2);
 259         p += MUL32(a2, k1);
 260         p += MUL32(a3, k0);
 261         t |= ((u64)((u32)p & 0x7fffffff)) << 32;
 262         p >>= 31;
 263         p += (u64)(((u32 *)ml)[INDEX_LOW]);
 264         p += MUL32(a0, k0);
 265         q =  MUL32(a1, k3);
 266         q += MUL32(a2, k2);
 267         q += MUL32(a3, k1);
 268         q += q;
 269         p += q;
 270         t2 = (u32)(p);
 271         p >>= 32;
 272         p += (u64)(((u32 *)ml)[INDEX_HIGH]);
 273         p += MUL32(a0, k1);
 274         p += MUL32(a1, k0);
 275         q =  MUL32(a2, k3);
 276         q += MUL32(a3, k2);
 277         q += q;
 278         p += q;
 279         *(u64 *)(alo) = (p << 32) | t2;
 280         p >>= 32;
 281         *(u64 *)(ahi) = p + t;
 282
 283 #undef a0
 284 #undef a1
 285 #undef a2
 286 #undef a3
 287 #undef k0
 288 #undef k1
 289 #undef k2
 290 #undef k3
 291 }
 292
 293 #define poly_step(ah, al, kh, kl, mh, ml)                               \
 294         poly_step_func(&(ah), &(al), &(kh), &(kl), &(mh), &(ml))
 295
 296 #endif  /* end of specialized NH and poly definitions */
 297
 298 /* At least nh_16 is defined. Defined others as needed here */
 299 #ifndef nh_16_2
 300 #define nh_16_2(mp, kp, nw, rh, rl, rh2, rl2)                           \
 301         do {                                                            \
 302                 nh_16(mp, kp, nw, rh, rl);                              \
 303                 nh_16(mp, ((kp)+2), nw, rh2, rl2);                      \
 304         } while (0)
 305 #endif
 306 #ifndef nh_vmac_nhbytes
 307 #define nh_vmac_nhbytes(mp, kp, nw, rh, rl)                             \
 308         nh_16(mp, kp, nw, rh, rl)
 309 #endif
 310 #ifndef nh_vmac_nhbytes_2
 311 #define nh_vmac_nhbytes_2(mp, kp, nw, rh, rl, rh2, rl2)                 \
 312         do {                                                            \
 313                 nh_vmac_nhbytes(mp, kp, nw, rh, rl);                    \
 314                 nh_vmac_nhbytes(mp, ((kp)+2), nw, rh2, rl2);            \
 315         } while (0)
 316 #endif
 317
 318 static void vhash_abort(struct vmac_ctx *ctx)
 319 {
 320         ctx->polytmp[0] = ctx->polykey[0] ;
 321         ctx->polytmp[1] = ctx->polykey[1] ;
 322         ctx->first_block_processed = 0;
 323 }
 324
 325 static u64 l3hash(u64 p1, u64 p2,
 326                         u64 k1, u64 k2, u64 len)
 327 {
 328         u64 rh, rl, t, z = 0;
 329
 330         /* fully reduce (p1,p2)+(len,0) mod p127 */
 331         t = p1 >> 63;
 332         p1 &= m63;
 333         ADD128(p1, p2, len, t);
 334         /* At this point, (p1,p2) is at most 2^127+(len<<64) */
 335         t = (p1 > m63) + ((p1 == m63) && (p2 == m64));
 336         ADD128(p1, p2, z, t);
 337         p1 &= m63;
 338
 339         /* compute (p1,p2)/(2^64-2^32) and (p1,p2)%(2^64-2^32) */
 340         t = p1 + (p2 >> 32);
 341         t += (t >> 32);
 342         t += (u32)t > 0xfffffffeu;
 343         p1 += (t >> 32);
 344         p2 += (p1 << 32);
 345
 346         /* compute (p1+k1)%p64 and (p2+k2)%p64 */
 347         p1 += k1;
 348         p1 += (0 - (p1 < k1)) & 257;
 349         p2 += k2;
 350         p2 += (0 - (p2 < k2)) & 257;
 351
 352         /* compute (p1+k1)*(p2+k2)%p64 */
 353         MUL64(rh, rl, p1, p2);
 354         t = rh >> 56;
 355         ADD128(t, rl, z, rh);
 356         rh <<= 8;
 357         ADD128(t, rl, z, rh);
 358         t += t << 8;
 359         rl += t;
 360         rl += (0 - (rl < t)) & 257;
 361         rl += (0 - (rl > p64-1)) & 257;
 362         return rl;
 363 }
 364
 365 static void vhash_update(const unsigned char *m,
 366                         unsigned int mbytes, /* Pos multiple of VMAC_NHBYTES */
 367                         struct vmac_ctx *ctx)
 368 {
 369         u64 rh, rl, *mptr;
 370         const u64 *kptr = (u64 *)ctx->nhkey;
 371         int i;
 372         u64 ch, cl;
 373         u64 pkh = ctx->polykey[0];
 374         u64 pkl = ctx->polykey[1];
 375
 376         mptr = (u64 *)m;
 377         i = mbytes / VMAC_NHBYTES;  /* Must be non-zero */
 378
 379         ch = ctx->polytmp[0];
 380         cl = ctx->polytmp[1];
 381
 382         if (!ctx->first_block_processed) {
 383                 ctx->first_block_processed = 1;
 384                 nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, rh, rl);
 385                 rh &= m62;
 386                 ADD128(ch, cl, rh, rl);
 387                 mptr += (VMAC_NHBYTES/sizeof(u64));
 388                 i--;
 389         }
 390
 391         while (i--) {
 392                 nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, rh, rl);
 393                 rh &= m62;
 394                 poly_step(ch, cl, pkh, pkl, rh, rl);
 395                 mptr += (VMAC_NHBYTES/sizeof(u64));
 396         }
 397
 398         ctx->polytmp[0] = ch;
 399         ctx->polytmp[1] = cl;
 400 }
 401
 402 static u64 vhash(unsigned char m[], unsigned int mbytes,
 403                         u64 *tagl, struct vmac_ctx *ctx)
 404 {
 405         u64 rh, rl, *mptr;
 406         const u64 *kptr = (u64 *)ctx->nhkey;
 407         int i, remaining;
 408         u64 ch, cl;
 409         u64 pkh = ctx->polykey[0];
 410         u64 pkl = ctx->polykey[1];
 411
 412         mptr = (u64 *)m;
 413         i = mbytes / VMAC_NHBYTES;
 414         remaining = mbytes % VMAC_NHBYTES;
 415
 416         if (ctx->first_block_processed) {
 417                 ch = ctx->polytmp[0];
 418                 cl = ctx->polytmp[1];
 419         } else if (i) {
 420                 nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, ch, cl);
 421                 ch &= m62;
 422                 ADD128(ch, cl, pkh, pkl);
 423                 mptr += (VMAC_NHBYTES/sizeof(u64));
 424                 i--;
 425         } else if (remaining) {
 426                 nh_16(mptr, kptr, 2*((remaining+15)/16), ch, cl);
 427                 ch &= m62;
 428                 ADD128(ch, cl, pkh, pkl);
 429                 mptr += (VMAC_NHBYTES/sizeof(u64));
 430                 goto do_l3;
 431         } else {/* Empty String */
 432                 ch = pkh; cl = pkl;
 433                 goto do_l3;
 434         }
 435
 436         while (i--) {
 437                 nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, rh, rl);
 438                 rh &= m62;
 439                 poly_step(ch, cl, pkh, pkl, rh, rl);
 440                 mptr += (VMAC_NHBYTES/sizeof(u64));
 441         }
 442         if (remaining) {
 443                 nh_16(mptr, kptr, 2*((remaining+15)/16), rh, rl);
 444                 rh &= m62;
 445                 poly_step(ch, cl, pkh, pkl, rh, rl);
 446         }
 447
 448 do_l3:
 449         vhash_abort(ctx);
 450         remaining *= 8;
 451         return l3hash(ch, cl, ctx->l3key[0], ctx->l3key[1], remaining);
 452 }
 453
 454 static u64 vmac(unsigned char m[], unsigned int mbytes,
 455                         unsigned char n[16], u64 *tagl,
 456                         struct vmac_ctx_t *ctx)
 457 {
 458         u64 *in_n, *out_p;
 459         u64 p, h;
 460         int i;
 461
 462         in_n = ctx->__vmac_ctx.cached_nonce;
 463         out_p = ctx->__vmac_ctx.cached_aes;
 464
 465         i = n[15] & 1;
 466         if ((*(u64 *)(n+8) != in_n[1]) || (*(u64 *)(n) != in_n[0])) {
 467                 in_n[0] = *(u64 *)(n);
 468                 in_n[1] = *(u64 *)(n+8);
 469                 ((unsigned char *)in_n)[15] &= 0xFE;
 470                 crypto_cipher_encrypt_one(ctx->child,
 471                         (unsigned char *)out_p, (unsigned char *)in_n);
 472
 473                 ((unsigned char *)in_n)[15] |= (unsigned char)(1-i);
 474         }
 475         p = be64_to_cpup(out_p + i);
 476         h = vhash(m, mbytes, (u64 *)0, &ctx->__vmac_ctx);
 477         return p + h;
 478 }
 479
 480 static int vmac_set_key(unsigned char user_key[], struct vmac_ctx_t *ctx)
 481 {
 482         u64 in[2] = {0}, out[2];
 483         unsigned i;
 484         int err = 0;
 485
 486         err = crypto_cipher_setkey(ctx->child, user_key, VMAC_KEY_LEN);
 487         if (err)
 488                 return err;
 489
 490         /* Fill nh key */
 491         ((unsigned char *)in)[0] = 0x80;
 492         for (i = 0; i < sizeof(ctx->__vmac_ctx.nhkey)/8; i += 2) {
 493                 crypto_cipher_encrypt_one(ctx->child,
 494                         (unsigned char *)out, (unsigned char *)in);
 495                 ctx->__vmac_ctx.nhkey[i] = be64_to_cpup(out);
 496                 ctx->__vmac_ctx.nhkey[i+1] = be64_to_cpup(out+1);
 497                 ((unsigned char *)in)[15] += 1;
 498         }
 499
 500         /* Fill poly key */
 501         ((unsigned char *)in)[0] = 0xC0;
 502         in[1] = 0;
 503         for (i = 0; i < sizeof(ctx->__vmac_ctx.polykey)/8; i += 2) {
 504                 crypto_cipher_encrypt_one(ctx->child,
 505                         (unsigned char *)out, (unsigned char *)in);
 506                 ctx->__vmac_ctx.polytmp[i] =
 507                         ctx->__vmac_ctx.polykey[i] =
 508                                 be64_to_cpup(out) & mpoly;
 509                 ctx->__vmac_ctx.polytmp[i+1] =
 510                         ctx->__vmac_ctx.polykey[i+1] =
 511                                 be64_to_cpup(out+1) & mpoly;
 512                 ((unsigned char *)in)[15] += 1;
 513         }
 514
 515         /* Fill ip key */
 516         ((unsigned char *)in)[0] = 0xE0;
 517         in[1] = 0;
 518         for (i = 0; i < sizeof(ctx->__vmac_ctx.l3key)/8; i += 2) {
 519                 do {
 520                         crypto_cipher_encrypt_one(ctx->child,
 521                                 (unsigned char *)out, (unsigned char *)in);
 522                         ctx->__vmac_ctx.l3key[i] = be64_to_cpup(out);
 523                         ctx->__vmac_ctx.l3key[i+1] = be64_to_cpup(out+1);
 524                         ((unsigned char *)in)[15] += 1;
 525                 } while (ctx->__vmac_ctx.l3key[i] >= p64
 526                         || ctx->__vmac_ctx.l3key[i+1] >= p64);
 527         }
 528
 529         /* Invalidate nonce/aes cache and reset other elements */
 530         ctx->__vmac_ctx.cached_nonce[0] = (u64)-1; /* Ensure illegal nonce */
 531         ctx->__vmac_ctx.cached_nonce[1] = (u64)0;  /* Ensure illegal nonce */
 532         ctx->__vmac_ctx.first_block_processed = 0;
 533
 534         return err;
 535 }
 536
 537 static int vmac_setkey(struct crypto_shash *parent,
 538                 const u8 *key, unsigned int keylen)
 539 {
 540         struct vmac_ctx_t *ctx = crypto_shash_ctx(parent);
 541
 542         if (keylen != VMAC_KEY_LEN) {
 543                 crypto_shash_set_flags(parent, CRYPTO_TFM_RES_BAD_KEY_LEN);
 544                 return -EINVAL;
 545         }
 546
 547         return vmac_set_key((u8 *)key, ctx);
 548 }
 549
 550 static int vmac_init(struct shash_desc *pdesc)
 551 {
 552         struct crypto_shash *parent = pdesc->tfm;
 553         struct vmac_ctx_t *ctx = crypto_shash_ctx(parent);
 554
 555         memset(&ctx->__vmac_ctx, 0, sizeof(struct vmac_ctx));
 556         return 0;
 557 }
 558
 559 static int vmac_update(struct shash_desc *pdesc, const u8 *p,
 560                 unsigned int len)
 561 {
 562         struct crypto_shash *parent = pdesc->tfm;
 563         struct vmac_ctx_t *ctx = crypto_shash_ctx(parent);
 564
 565         vhash_update(p, len, &ctx->__vmac_ctx);
 566
 567         return 0;
 568 }
 569
 570 static int vmac_final(struct shash_desc *pdesc, u8 *out)
 571 {
 572         struct crypto_shash *parent = pdesc->tfm;
 573         struct vmac_ctx_t *ctx = crypto_shash_ctx(parent);
 574         vmac_t mac;
 575         u8 nonce[16] = {};
 576
 577         mac = vmac(NULL, 0, nonce, NULL, ctx);
 578         memcpy(out, &mac, sizeof(vmac_t));
 579         memset(&mac, 0, sizeof(vmac_t));
 580         memset(&ctx->__vmac_ctx, 0, sizeof(struct vmac_ctx));
 581         return 0;
 582 }
 583
 584 static int vmac_init_tfm(struct crypto_tfm *tfm)
 585 {
 586         struct crypto_cipher *cipher;
 587         struct crypto_instance *inst = (void *)tfm->__crt_alg;
 588         struct crypto_spawn *spawn = crypto_instance_ctx(inst);
 589         struct vmac_ctx_t *ctx = crypto_tfm_ctx(tfm);
 590
 591         cipher = crypto_spawn_cipher(spawn);
 592         if (IS_ERR(cipher))
 593                 return PTR_ERR(cipher);
 594
 595         ctx->child = cipher;
 596         return 0;
 597 }
 598
 599 static void vmac_exit_tfm(struct crypto_tfm *tfm)
 600 {
 601         struct vmac_ctx_t *ctx = crypto_tfm_ctx(tfm);
 602         crypto_free_cipher(ctx->child);
 603 }
 604
 605 static int vmac_create(struct crypto_template *tmpl, struct rtattr **tb)
 606 {
 607         struct shash_instance *inst;
 608         struct crypto_alg *alg;
 609         int err;
 610
 611         err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
 612         if (err)
 613                 return err;
 614
 615         alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
 616                         CRYPTO_ALG_TYPE_MASK);
 617         if (IS_ERR(alg))
 618                 return PTR_ERR(alg);
 619
 620         inst = shash_alloc_instance("vmac", alg);
 621         err = PTR_ERR(inst);
 622         if (IS_ERR(inst))
 623                 goto out_put_alg;
 624
 625         err = crypto_init_spawn(shash_instance_ctx(inst), alg,
 626                         shash_crypto_instance(inst),
 627                         CRYPTO_ALG_TYPE_MASK);
 628         if (err)
 629                 goto out_free_inst;
 630
 631         inst->alg.base.cra_priority = alg->cra_priority;
 632         inst->alg.base.cra_blocksize = alg->cra_blocksize;
 633         inst->alg.base.cra_alignmask = alg->cra_alignmask;
 634
 635         inst->alg.digestsize = sizeof(vmac_t);
 636         inst->alg.base.cra_ctxsize = sizeof(struct vmac_ctx_t);
 637         inst->alg.base.cra_init = vmac_init_tfm;
 638         inst->alg.base.cra_exit = vmac_exit_tfm;
 639
 640         inst->alg.init = vmac_init;
 641         inst->alg.update = vmac_update;
 642         inst->alg.final = vmac_final;
 643         inst->alg.setkey = vmac_setkey;
 644
 645         err = shash_register_instance(tmpl, inst);
 646         if (err) {
 647 out_free_inst:
 648                 shash_free_instance(shash_crypto_instance(inst));
 649         }
 650
 651 out_put_alg:
 652         crypto_mod_put(alg);
 653         return err;
 654 }
 655
 656 static struct crypto_template vmac_tmpl = {
 657         .name = "vmac",
 658         .create = vmac_create,
 659         .free = shash_free_instance,
 660         .module = THIS_MODULE,
 661 };
 662
 663 static int __init vmac_module_init(void)
 664 {
 665         return crypto_register_template(&vmac_tmpl);
 666 }
 667
 668 static void __exit vmac_module_exit(void)
 669 {
 670         crypto_unregister_template(&vmac_tmpl);
 671 }
 672
 673 module_init(vmac_module_init);
 674 module_exit(vmac_module_exit);
 675
 676 MODULE_LICENSE("GPL");
 677 MODULE_DESCRIPTION("VMAC hash algorithm");
 678