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 40const u64 p64 = UINT64_C(0xfffffffffffffeff); /* 2^64 - 257 prime */ 41const u64 m62 = UINT64_C(0x3fffffffffffffff); /* 62-bit mask */ 42const u64 m63 = UINT64_C(0x7fffffffffffffff); /* 63-bit mask */ 43const u64 m64 = UINT64_C(0xffffffffffffffff); /* 64-bit mask */ 44const 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 235static 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 320static 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 327static 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 366static 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 403static 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 449do_l3: 450 vhash_abort(ctx); 451 remaining *= 8; 452 return l3hash(ch, cl, ctx->l3key[0], ctx->l3key[1], remaining); 453} 454 455static 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 481static 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 538static 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 551static int vmac_init(struct shash_desc *pdesc) 552{ 553 return 0; 554} 555 556static 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 567static 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 581static 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 596static 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 602static 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) { 644out_free_inst: 645 shash_free_instance(shash_crypto_instance(inst)); 646 } 647 648out_put_alg: 649 crypto_mod_put(alg); 650 return err; 651} 652 653static struct crypto_template vmac_tmpl = { 654 .name = "vmac", 655 .create = vmac_create, 656 .free = shash_free_instance, 657 .module = THIS_MODULE, 658}; 659 660static int __init vmac_module_init(void) 661{ 662 return crypto_register_template(&vmac_tmpl); 663} 664 665static void __exit vmac_module_exit(void) 666{ 667 crypto_unregister_template(&vmac_tmpl); 668} 669 670module_init(vmac_module_init); 671module_exit(vmac_module_exit); 672 673MODULE_LICENSE("GPL"); 674MODULE_DESCRIPTION("VMAC hash algorithm"); 675