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 #define pe64_to_cpup le64_to_cpup               /* Prefer little endian */
  47
  48 #ifdef __LITTLE_ENDIAN
  49 #define INDEX_HIGH 1
  50 #define INDEX_LOW 0
  51 #else
  52 #define INDEX_HIGH 0
  53 #define INDEX_LOW 1
  54 #endif
  55
  56 /*
  57  * The following routines are used in this implementation. They are
  58  * written via macros to simulate zero-overhead call-by-reference.
  59  *
  60  * MUL64: 64x64->128-bit multiplication
  61  * PMUL64: assumes top bits cleared on inputs
  62  * ADD128: 128x128->128-bit addition
  63  */
  64
  65 #define ADD128(rh, rl, ih, il)                                          \
  66         do {                                                            \
  67                 u64 _il = (il);                                         \
  68                 (rl) += (_il);                                          \
  69                 if ((rl) < (_il))                                       \
  70                         (rh)++;                                         \
  71                 (rh) += (ih);                                           \
  72         } while (0)
  73
  74 #define MUL32(i1, i2)   ((u64)(u32)(i1)*(u32)(i2))
  75
  76 #define PMUL64(rh, rl, i1, i2)  /* Assumes m doesn't overflow */        \
  77         do {                                                            \
  78                 u64 _i1 = (i1), _i2 = (i2);                             \
  79                 u64 m = MUL32(_i1, _i2>>32) + MUL32(_i1>>32, _i2);      \
  80                 rh = MUL32(_i1>>32, _i2>>32);                           \
  81                 rl = MUL32(_i1, _i2);                                   \
  82                 ADD128(rh, rl, (m >> 32), (m << 32));                   \
  83         } while (0)
  84
  85 #define MUL64(rh, rl, i1, i2)                                           \
  86         do {                                                            \
  87                 u64 _i1 = (i1), _i2 = (i2);                             \
  88                 u64 m1 = MUL32(_i1, _i2>>32);                           \
  89                 u64 m2 = MUL32(_i1>>32, _i2);                           \
  90                 rh = MUL32(_i1>>32, _i2>>32);                           \
  91                 rl = MUL32(_i1, _i2);                                   \
  92                 ADD128(rh, rl, (m1 >> 32), (m1 << 32));                 \
  93                 ADD128(rh, rl, (m2 >> 32), (m2 << 32));                 \
  94         } while (0)
  95
  96 /*
  97  * For highest performance the L1 NH and L2 polynomial hashes should be
  98  * carefully implemented to take advantage of one's target architechture.
  99  * Here these two hash functions are defined multiple time; once for
 100  * 64-bit architectures, once for 32-bit SSE2 architectures, and once
 101  * for the rest (32-bit) architectures.
 102  * For each, nh_16 *must* be defined (works on multiples of 16 bytes).
 103  * Optionally, nh_vmac_nhbytes can be defined (for multiples of
 104  * VMAC_NHBYTES), and nh_16_2 and nh_vmac_nhbytes_2 (versions that do two
 105  * NH computations at once).
 106  */
 107
 108 #ifdef CONFIG_64BIT
 109
 110 #define nh_16(mp, kp, nw, rh, rl)                                       \
 111         do {                                                            \
 112                 int i; u64 th, tl;                                      \
 113                 rh = rl = 0;                                            \
 114                 for (i = 0; i < nw; i += 2) {                           \
 115                         MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i],     \
 116                                 pe64_to_cpup((mp)+i+1)+(kp)[i+1]);      \
 117                         ADD128(rh, rl, th, tl);                         \
 118                 }                                                       \
 119         } while (0)
 120
 121 #define nh_16_2(mp, kp, nw, rh, rl, rh1, rl1)                           \
 122         do {                                                            \
 123                 int i; u64 th, tl;                                      \
 124                 rh1 = rl1 = rh = rl = 0;                                \
 125                 for (i = 0; i < nw; i += 2) {                           \
 126                         MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i],     \
 127                                 pe64_to_cpup((mp)+i+1)+(kp)[i+1]);      \
 128                         ADD128(rh, rl, th, tl);                         \
 129                         MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i+2],   \
 130                                 pe64_to_cpup((mp)+i+1)+(kp)[i+3]);      \
 131                         ADD128(rh1, rl1, th, tl);                       \
 132                 }                                                       \
 133         } while (0)
 134
 135 #if (VMAC_NHBYTES >= 64) /* These versions do 64-bytes of message at a time */
 136 #define nh_vmac_nhbytes(mp, kp, nw, rh, rl)                             \
 137         do {                                                            \
 138                 int i; u64 th, tl;                                      \
 139                 rh = rl = 0;                                            \
 140                 for (i = 0; i < nw; i += 8) {                           \
 141                         MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i],     \
 142                                 pe64_to_cpup((mp)+i+1)+(kp)[i+1]);      \
 143                         ADD128(rh, rl, th, tl);                         \
 144                         MUL64(th, tl, pe64_to_cpup((mp)+i+2)+(kp)[i+2], \
 145                                 pe64_to_cpup((mp)+i+3)+(kp)[i+3]);      \
 146                         ADD128(rh, rl, th, tl);                         \
 147                         MUL64(th, tl, pe64_to_cpup((mp)+i+4)+(kp)[i+4], \
 148                                 pe64_to_cpup((mp)+i+5)+(kp)[i+5]);      \
 149                         ADD128(rh, rl, th, tl);                         \
 150                         MUL64(th, tl, pe64_to_cpup((mp)+i+6)+(kp)[i+6], \
 151                                 pe64_to_cpup((mp)+i+7)+(kp)[i+7]);      \
 152                         ADD128(rh, rl, th, tl);                         \
 153                 }                                                       \
 154         } while (0)
 155
 156 #define nh_vmac_nhbytes_2(mp, kp, nw, rh, rl, rh1, rl1)                 \
 157         do {                                                            \
 158                 int i; u64 th, tl;                                      \
 159                 rh1 = rl1 = rh = rl = 0;                                \
 160                 for (i = 0; i < nw; i += 8) {                           \
 161                         MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i],     \
 162                                 pe64_to_cpup((mp)+i+1)+(kp)[i+1]);      \
 163                         ADD128(rh, rl, th, tl);                         \
 164                         MUL64(th, tl, pe64_to_cpup((mp)+i)+(kp)[i+2],   \
 165                                 pe64_to_cpup((mp)+i+1)+(kp)[i+3]);      \
 166                         ADD128(rh1, rl1, th, tl);                       \
 167                         MUL64(th, tl, pe64_to_cpup((mp)+i+2)+(kp)[i+2], \
 168                                 pe64_to_cpup((mp)+i+3)+(kp)[i+3]);      \
 169                         ADD128(rh, rl, th, tl);                         \
 170                         MUL64(th, tl, pe64_to_cpup((mp)+i+2)+(kp)[i+4], \
 171                                 pe64_to_cpup((mp)+i+3)+(kp)[i+5]);      \
 172                         ADD128(rh1, rl1, th, tl);                       \
 173                         MUL64(th, tl, pe64_to_cpup((mp)+i+4)+(kp)[i+4], \
 174                                 pe64_to_cpup((mp)+i+5)+(kp)[i+5]);      \
 175                         ADD128(rh, rl, th, tl);                         \
 176                         MUL64(th, tl, pe64_to_cpup((mp)+i+4)+(kp)[i+6], \
 177                                 pe64_to_cpup((mp)+i+5)+(kp)[i+7]);      \
 178                         ADD128(rh1, rl1, th, tl);                       \
 179                         MUL64(th, tl, pe64_to_cpup((mp)+i+6)+(kp)[i+6], \
 180                                 pe64_to_cpup((mp)+i+7)+(kp)[i+7]);      \
 181                         ADD128(rh, rl, th, tl);                         \
 182                         MUL64(th, tl, pe64_to_cpup((mp)+i+6)+(kp)[i+8], \
 183                                 pe64_to_cpup((mp)+i+7)+(kp)[i+9]);      \
 184                         ADD128(rh1, rl1, th, tl);                       \
 185                 }                                                       \
 186         } while (0)
 187 #endif
 188
 189 #define poly_step(ah, al, kh, kl, mh, ml)                               \
 190         do {                                                            \
 191                 u64 t1h, t1l, t2h, t2l, t3h, t3l, z = 0;                \
 192                 /* compute ab*cd, put bd into result registers */       \
 193                 PMUL64(t3h, t3l, al, kh);                               \
 194                 PMUL64(t2h, t2l, ah, kl);                               \
 195                 PMUL64(t1h, t1l, ah, 2*kh);                             \
 196                 PMUL64(ah, al, al, kl);                                 \
 197                 /* add 2 * ac to result */                              \
 198                 ADD128(ah, al, t1h, t1l);                               \
 199                 /* add together ad + bc */                              \
 200                 ADD128(t2h, t2l, t3h, t3l);                             \
 201                 /* now (ah,al), (t2l,2*t2h) need summing */             \
 202                 /* first add the high registers, carrying into t2h */   \
 203                 ADD128(t2h, ah, z, t2l);                                \
 204                 /* double t2h and add top bit of ah */                  \
 205                 t2h = 2 * t2h + (ah >> 63);                             \
 206                 ah &= m63;                                              \
 207                 /* now add the low registers */                         \
 208                 ADD128(ah, al, mh, ml);                                 \
 209                 ADD128(ah, al, z, t2h);                                 \
 210         } while (0)
 211
 212 #else /* ! CONFIG_64BIT */
 213
 214 #ifndef nh_16
 215 #define nh_16(mp, kp, nw, rh, rl)                                       \
 216         do {                                                            \
 217                 u64 t1, t2, m1, m2, t;                                  \
 218                 int i;                                                  \
 219                 rh = rl = t = 0;                                        \
 220                 for (i = 0; i < nw; i += 2)  {                          \
 221                         t1 = pe64_to_cpup(mp+i) + kp[i];                \
 222                         t2 = pe64_to_cpup(mp+i+1) + kp[i+1];            \
 223                         m2 = MUL32(t1 >> 32, t2);                       \
 224                         m1 = MUL32(t1, t2 >> 32);                       \
 225                         ADD128(rh, rl, MUL32(t1 >> 32, t2 >> 32),       \
 226                                 MUL32(t1, t2));                         \
 227                         rh += (u64)(u32)(m1 >> 32)                      \
 228                                 + (u32)(m2 >> 32);                      \
 229                         t += (u64)(u32)m1 + (u32)m2;                    \
 230                 }                                                       \
 231                 ADD128(rh, rl, (t >> 32), (t << 32));                   \
 232         } while (0)
 233 #endif
 234
 235 static void poly_step_func(u64 *ahi, u64 *alo,
 236                         const u64 *kh, const u64 *kl,
 237                         const u64 *mh, const u64 *ml)
 238 {
 239 #define a0 (*(((u32 *)alo)+INDEX_LOW))
 240 #define a1 (*(((u32 *)alo)+INDEX_HIGH))
 241 #define a2 (*(((u32 *)ahi)+INDEX_LOW))
 242 #define a3 (*(((u32 *)ahi)+INDEX_HIGH))
 243 #define k0 (*(((u32 *)kl)+INDEX_LOW))
 244 #define k1 (*(((u32 *)kl)+INDEX_HIGH))
 245 #define k2 (*(((u32 *)kh)+INDEX_LOW))
 246 #define k3 (*(((u32 *)kh)+INDEX_HIGH))
 247
 248         u64 p, q, t;
 249         u32 t2;
 250
 251         p = MUL32(a3, k3);
 252         p += p;
 253         p += *(u64 *)mh;
 254         p += MUL32(a0, k2);
 255         p += MUL32(a1, k1);
 256         p += MUL32(a2, k0);
 257         t = (u32)(p);
 258         p >>= 32;
 259         p += MUL32(a0, k3);
 260         p += MUL32(a1, k2);
 261         p += MUL32(a2, k1);
 262         p += MUL32(a3, k0);
 263         t |= ((u64)((u32)p & 0x7fffffff)) << 32;
 264         p >>= 31;
 265         p += (u64)(((u32 *)ml)[INDEX_LOW]);
 266         p += MUL32(a0, k0);
 267         q =  MUL32(a1, k3);
 268         q += MUL32(a2, k2);
 269         q += MUL32(a3, k1);
 270         q += q;
 271         p += q;
 272         t2 = (u32)(p);
 273         p >>= 32;
 274         p += (u64)(((u32 *)ml)[INDEX_HIGH]);
 275         p += MUL32(a0, k1);
 276         p += MUL32(a1, k0);
 277         q =  MUL32(a2, k3);
 278         q += MUL32(a3, k2);
 279         q += q;
 280         p += q;
 281         *(u64 *)(alo) = (p << 32) | t2;
 282         p >>= 32;
 283         *(u64 *)(ahi) = p + t;
 284
 285 #undef a0
 286 #undef a1
 287 #undef a2
 288 #undef a3
 289 #undef k0
 290 #undef k1
 291 #undef k2
 292 #undef k3
 293 }
 294
 295 #define poly_step(ah, al, kh, kl, mh, ml)                               \
 296         poly_step_func(&(ah), &(al), &(kh), &(kl), &(mh), &(ml))
 297
 298 #endif  /* end of specialized NH and poly definitions */
 299
 300 /* At least nh_16 is defined. Defined others as needed here */
 301 #ifndef nh_16_2
 302 #define nh_16_2(mp, kp, nw, rh, rl, rh2, rl2)                           \
 303         do {                                                            \
 304                 nh_16(mp, kp, nw, rh, rl);                              \
 305                 nh_16(mp, ((kp)+2), nw, rh2, rl2);                      \
 306         } while (0)
 307 #endif
 308 #ifndef nh_vmac_nhbytes
 309 #define nh_vmac_nhbytes(mp, kp, nw, rh, rl)                             \
 310         nh_16(mp, kp, nw, rh, rl)
 311 #endif
 312 #ifndef nh_vmac_nhbytes_2
 313 #define nh_vmac_nhbytes_2(mp, kp, nw, rh, rl, rh2, rl2)                 \
 314         do {                                                            \
 315                 nh_vmac_nhbytes(mp, kp, nw, rh, rl);                    \
 316                 nh_vmac_nhbytes(mp, ((kp)+2), nw, rh2, rl2);            \
 317         } while (0)
 318 #endif
 319
 320 static void vhash_abort(struct vmac_ctx *ctx)
 321 {
 322         ctx->polytmp[0] = ctx->polykey[0] ;
 323         ctx->polytmp[1] = ctx->polykey[1] ;
 324         ctx->first_block_processed = 0;
 325 }
 326
 327 static u64 l3hash(u64 p1, u64 p2, u64 k1, u64 k2, u64 len)
 328 {
 329         u64 rh, rl, t, z = 0;
 330
 331         /* fully reduce (p1,p2)+(len,0) mod p127 */
 332         t = p1 >> 63;
 333         p1 &= m63;
 334         ADD128(p1, p2, len, t);
 335         /* At this point, (p1,p2) is at most 2^127+(len<<64) */
 336         t = (p1 > m63) + ((p1 == m63) && (p2 == m64));
 337         ADD128(p1, p2, z, t);
 338         p1 &= m63;
 339
 340         /* compute (p1,p2)/(2^64-2^32) and (p1,p2)%(2^64-2^32) */
 341         t = p1 + (p2 >> 32);
 342         t += (t >> 32);
 343         t += (u32)t > 0xfffffffeu;
 344         p1 += (t >> 32);
 345         p2 += (p1 << 32);
 346
 347         /* compute (p1+k1)%p64 and (p2+k2)%p64 */
 348         p1 += k1;
 349         p1 += (0 - (p1 < k1)) & 257;
 350         p2 += k2;
 351         p2 += (0 - (p2 < k2)) & 257;
 352
 353         /* compute (p1+k1)*(p2+k2)%p64 */
 354         MUL64(rh, rl, p1, p2);
 355         t = rh >> 56;
 356         ADD128(t, rl, z, rh);
 357         rh <<= 8;
 358         ADD128(t, rl, z, rh);
 359         t += t << 8;
 360         rl += t;
 361         rl += (0 - (rl < t)) & 257;
 362         rl += (0 - (rl > p64-1)) & 257;
 363         return rl;
 364 }
 365
 366 static void vhash_update(const unsigned char *m,
 367                         unsigned int mbytes, /* Pos multiple of VMAC_NHBYTES */
 368                         struct vmac_ctx *ctx)
 369 {
 370         u64 rh, rl, *mptr;
 371         const u64 *kptr = (u64 *)ctx->nhkey;
 372         int i;
 373         u64 ch, cl;
 374         u64 pkh = ctx->polykey[0];
 375         u64 pkl = ctx->polykey[1];
 376
 377         mptr = (u64 *)m;
 378         i = mbytes / VMAC_NHBYTES;  /* Must be non-zero */
 379
 380         ch = ctx->polytmp[0];
 381         cl = ctx->polytmp[1];
 382
 383         if (!ctx->first_block_processed) {
 384                 ctx->first_block_processed = 1;
 385                 nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, rh, rl);
 386                 rh &= m62;
 387                 ADD128(ch, cl, rh, rl);
 388                 mptr += (VMAC_NHBYTES/sizeof(u64));
 389                 i--;
 390         }
 391
 392         while (i--) {
 393                 nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, rh, rl);
 394                 rh &= m62;
 395                 poly_step(ch, cl, pkh, pkl, rh, rl);
 396                 mptr += (VMAC_NHBYTES/sizeof(u64));
 397         }
 398
 399         ctx->polytmp[0] = ch;
 400         ctx->polytmp[1] = cl;
 401 }
 402
 403 static u64 vhash(unsigned char m[], unsigned int mbytes,
 404                         u64 *tagl, struct vmac_ctx *ctx)
 405 {
 406         u64 rh, rl, *mptr;
 407         const u64 *kptr = (u64 *)ctx->nhkey;
 408         int i, remaining;
 409         u64 ch, cl;
 410         u64 pkh = ctx->polykey[0];
 411         u64 pkl = ctx->polykey[1];
 412
 413         mptr = (u64 *)m;
 414         i = mbytes / VMAC_NHBYTES;
 415         remaining = mbytes % VMAC_NHBYTES;
 416
 417         if (ctx->first_block_processed) {
 418                 ch = ctx->polytmp[0];
 419                 cl = ctx->polytmp[1];
 420         } else if (i) {
 421                 nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, ch, cl);
 422                 ch &= m62;
 423                 ADD128(ch, cl, pkh, pkl);
 424                 mptr += (VMAC_NHBYTES/sizeof(u64));
 425                 i--;
 426         } else if (remaining) {
 427                 nh_16(mptr, kptr, 2*((remaining+15)/16), ch, cl);
 428                 ch &= m62;
 429                 ADD128(ch, cl, pkh, pkl);
 430                 mptr += (VMAC_NHBYTES/sizeof(u64));
 431                 goto do_l3;
 432         } else {/* Empty String */
 433                 ch = pkh; cl = pkl;
 434                 goto do_l3;
 435         }
 436
 437         while (i--) {
 438                 nh_vmac_nhbytes(mptr, kptr, VMAC_NHBYTES/8, rh, rl);
 439                 rh &= m62;
 440                 poly_step(ch, cl, pkh, pkl, rh, rl);
 441                 mptr += (VMAC_NHBYTES/sizeof(u64));
 442         }
 443         if (remaining) {
 444                 nh_16(mptr, kptr, 2*((remaining+15)/16), rh, rl);
 445                 rh &= m62;
 446                 poly_step(ch, cl, pkh, pkl, rh, rl);
 447         }
 448
 449 do_l3:
 450         vhash_abort(ctx);
 451         remaining *= 8;
 452         return l3hash(ch, cl, ctx->l3key[0], ctx->l3key[1], remaining);
 453 }
 454
 455 static u64 vmac(unsigned char m[], unsigned int mbytes,
 456                         unsigned char n[16], u64 *tagl,
 457                         struct vmac_ctx_t *ctx)
 458 {
 459         u64 *in_n, *out_p;
 460         u64 p, h;
 461         int i;
 462
 463         in_n = ctx->__vmac_ctx.cached_nonce;
 464         out_p = ctx->__vmac_ctx.cached_aes;
 465
 466         i = n[15] & 1;
 467         if ((*(u64 *)(n+8) != in_n[1]) || (*(u64 *)(n) != in_n[0])) {
 468                 in_n[0] = *(u64 *)(n);
 469                 in_n[1] = *(u64 *)(n+8);
 470                 ((unsigned char *)in_n)[15] &= 0xFE;
 471                 crypto_cipher_encrypt_one(ctx->child,
 472                         (unsigned char *)out_p, (unsigned char *)in_n);
 473
 474                 ((unsigned char *)in_n)[15] |= (unsigned char)(1-i);
 475         }
 476         p = be64_to_cpup(out_p + i);
 477         h = vhash(m, mbytes, (u64 *)0, &ctx->__vmac_ctx);
 478         return le64_to_cpu(p + h);
 479 }
 480
 481 static int vmac_set_key(unsigned char user_key[], struct vmac_ctx_t *ctx)
 482 {
 483         u64 in[2] = {0}, out[2];
 484         unsigned i;
 485         int err = 0;
 486
 487         err = crypto_cipher_setkey(ctx->child, user_key, VMAC_KEY_LEN);
 488         if (err)
 489                 return err;
 490
 491         /* Fill nh key */
 492         ((unsigned char *)in)[0] = 0x80;
 493         for (i = 0; i < sizeof(ctx->__vmac_ctx.nhkey)/8; i += 2) {
 494                 crypto_cipher_encrypt_one(ctx->child,
 495                         (unsigned char *)out, (unsigned char *)in);
 496                 ctx->__vmac_ctx.nhkey[i] = be64_to_cpup(out);
 497                 ctx->__vmac_ctx.nhkey[i+1] = be64_to_cpup(out+1);
 498                 ((unsigned char *)in)[15] += 1;
 499         }
 500
 501         /* Fill poly key */
 502         ((unsigned char *)in)[0] = 0xC0;
 503         in[1] = 0;
 504         for (i = 0; i < sizeof(ctx->__vmac_ctx.polykey)/8; i += 2) {
 505                 crypto_cipher_encrypt_one(ctx->child,
 506                         (unsigned char *)out, (unsigned char *)in);
 507                 ctx->__vmac_ctx.polytmp[i] =
 508                         ctx->__vmac_ctx.polykey[i] =
 509                                 be64_to_cpup(out) & mpoly;
 510                 ctx->__vmac_ctx.polytmp[i+1] =
 511                         ctx->__vmac_ctx.polykey[i+1] =
 512                                 be64_to_cpup(out+1) & mpoly;
 513                 ((unsigned char *)in)[15] += 1;
 514         }
 515
 516         /* Fill ip key */
 517         ((unsigned char *)in)[0] = 0xE0;
 518         in[1] = 0;
 519         for (i = 0; i < sizeof(ctx->__vmac_ctx.l3key)/8; i += 2) {
 520                 do {
 521                         crypto_cipher_encrypt_one(ctx->child,
 522                                 (unsigned char *)out, (unsigned char *)in);
 523                         ctx->__vmac_ctx.l3key[i] = be64_to_cpup(out);
 524                         ctx->__vmac_ctx.l3key[i+1] = be64_to_cpup(out+1);
 525                         ((unsigned char *)in)[15] += 1;
 526                 } while (ctx->__vmac_ctx.l3key[i] >= p64
 527                         || ctx->__vmac_ctx.l3key[i+1] >= p64);
 528         }
 529
 530         /* Invalidate nonce/aes cache and reset other elements */
 531         ctx->__vmac_ctx.cached_nonce[0] = (u64)-1; /* Ensure illegal nonce */
 532         ctx->__vmac_ctx.cached_nonce[1] = (u64)0;  /* Ensure illegal nonce */
 533         ctx->__vmac_ctx.first_block_processed = 0;
 534
 535         return err;
 536 }
 537
 538 static int vmac_setkey(struct crypto_shash *parent,
 539                 const u8 *key, unsigned int keylen)
 540 {
 541         struct vmac_ctx_t *ctx = crypto_shash_ctx(parent);
 542
 543         if (keylen != VMAC_KEY_LEN) {
 544                 crypto_shash_set_flags(parent, CRYPTO_TFM_RES_BAD_KEY_LEN);
 545                 return -EINVAL;
 546         }
 547
 548         return vmac_set_key((u8 *)key, ctx);
 549 }
 550
 551 static int vmac_init(struct shash_desc *pdesc)
 552 {
 553         return 0;
 554 }
 555
 556 static int vmac_update(struct shash_desc *pdesc, const u8 *p,
 557                 unsigned int len)
 558 {
 559         struct crypto_shash *parent = pdesc->tfm;
 560         struct vmac_ctx_t *ctx = crypto_shash_ctx(parent);
 561
 562         vhash_update(p, len, &ctx->__vmac_ctx);
 563
 564         return 0;
 565 }
 566
 567 static int vmac_final(struct shash_desc *pdesc, u8 *out)
 568 {
 569         struct crypto_shash *parent = pdesc->tfm;
 570         struct vmac_ctx_t *ctx = crypto_shash_ctx(parent);
 571         vmac_t mac;
 572         u8 nonce[16] = {};
 573
 574         mac = vmac(NULL, 0, nonce, NULL, ctx);
 575         memcpy(out, &mac, sizeof(vmac_t));
 576         memset(&mac, 0, sizeof(vmac_t));
 577         memset(&ctx->__vmac_ctx, 0, sizeof(struct vmac_ctx));
 578         return 0;
 579 }
 580
 581 static int vmac_init_tfm(struct crypto_tfm *tfm)
 582 {
 583         struct crypto_cipher *cipher;
 584         struct crypto_instance *inst = (void *)tfm->__crt_alg;
 585         struct crypto_spawn *spawn = crypto_instance_ctx(inst);
 586         struct vmac_ctx_t *ctx = crypto_tfm_ctx(tfm);
 587
 588         cipher = crypto_spawn_cipher(spawn);
 589         if (IS_ERR(cipher))
 590                 return PTR_ERR(cipher);
 591
 592         ctx->child = cipher;
 593         return 0;
 594 }
 595
 596 static void vmac_exit_tfm(struct crypto_tfm *tfm)
 597 {
 598         struct vmac_ctx_t *ctx = crypto_tfm_ctx(tfm);
 599         crypto_free_cipher(ctx->child);
 600 }
 601
 602 static int vmac_create(struct crypto_template *tmpl, struct rtattr **tb)
 603 {
 604         struct shash_instance *inst;
 605         struct crypto_alg *alg;
 606         int err;
 607
 608         err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
 609         if (err)
 610                 return err;
 611
 612         alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
 613                         CRYPTO_ALG_TYPE_MASK);
 614         if (IS_ERR(alg))
 615                 return PTR_ERR(alg);
 616
 617         inst = shash_alloc_instance("vmac", alg);
 618         err = PTR_ERR(inst);
 619         if (IS_ERR(inst))
 620                 goto out_put_alg;
 621
 622         err = crypto_init_spawn(shash_instance_ctx(inst), alg,
 623                         shash_crypto_instance(inst),
 624                         CRYPTO_ALG_TYPE_MASK);
 625         if (err)
 626                 goto out_free_inst;
 627
 628         inst->alg.base.cra_priority = alg->cra_priority;
 629         inst->alg.base.cra_blocksize = alg->cra_blocksize;
 630         inst->alg.base.cra_alignmask = alg->cra_alignmask;
 631
 632         inst->alg.digestsize = sizeof(vmac_t);
 633         inst->alg.base.cra_ctxsize = sizeof(struct vmac_ctx_t);
 634         inst->alg.base.cra_init = vmac_init_tfm;
 635         inst->alg.base.cra_exit = vmac_exit_tfm;
 636
 637         inst->alg.init = vmac_init;
 638         inst->alg.update = vmac_update;
 639         inst->alg.final = vmac_final;
 640         inst->alg.setkey = vmac_setkey;
 641
 642         err = shash_register_instance(tmpl, inst);
 643         if (err) {
 644 out_free_inst:
 645                 shash_free_instance(shash_crypto_instance(inst));
 646         }
 647
 648 out_put_alg:
 649         crypto_mod_put(alg);
 650         return err;
 651 }
 652
 653 static struct crypto_template vmac_tmpl = {
 654         .name = "vmac",
 655         .create = vmac_create,
 656         .free = shash_free_instance,
 657         .module = THIS_MODULE,
 658 };
 659
 660 static int __init vmac_module_init(void)
 661 {
 662         return crypto_register_template(&vmac_tmpl);
 663 }
 664
 665 static void __exit vmac_module_exit(void)
 666 {
 667         crypto_unregister_template(&vmac_tmpl);
 668 }
 669
 670 module_init(vmac_module_init);
 671 module_exit(vmac_module_exit);
 672
 673 MODULE_LICENSE("GPL");
 674 MODULE_DESCRIPTION("VMAC hash algorithm");
 675