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1 /* $OpenBSD: umac.c,v 1.17 2018/04/10 00:10:49 djm Exp $ */ -

2 /* ----------------------------------------------------------------------- -

3 * -

4 * umac.c -- C Implementation UMAC Message Authentication -

5 * -

6 * Version 0.93b of rfc4418.txt -- 2006 July 18 -

7 * -

8 * For a full description of UMAC message authentication see the UMAC -

9 * world-wide-web page at http://www.cs.ucdavis.edu/~rogaway/umac -

10 * Please report bugs and suggestions to the UMAC webpage. -

11 * -

13 * -

14 * Permission to use, copy, modify, and distribute this software and -

15 * its documentation for any purpose and with or without fee, is hereby -

16 * granted provided that the above copyright notice appears in all copies -

17 * and in supporting documentation, and that the name of the copyright -

18 * holder not be used in advertising or publicity pertaining to -

19 * distribution of the software without specific, written prior permission. -

20 * -

21 * Comments should be directed to Ted Krovetz (tdk@acm.org) -

22 * -

23 * ---------------------------------------------------------------------- */ -

24 -

25 /* ////////////////////// IMPORTANT NOTES ///////////////////////////////// -

26 * -

27 * 1) This version does not work properly on messages larger than 16MB -

28 * -

29 * 2) If you set the switch to use SSE2, then all data must be 16-byte -

30 * aligned -

31 * -

32 * 3) When calling the function umac(), it is assumed that msg is in -

33 * a writable buffer of length divisible by 32 bytes. The message itself -

34 * does not have to fill the entire buffer, but bytes beyond msg may be -

35 * zeroed. -

36 * -

37 * 4) Three free AES implementations are supported by this implementation of -

38 * UMAC. Paulo Barreto's version is in the public domain and can be found -

39 * at http://www.esat.kuleuven.ac.be/~rijmen/rijndael/ (search for -

40 * "Barreto"). The only two files needed are rijndael-alg-fst.c and -

41 * rijndael-alg-fst.h. Brian Gladman's version is distributed with the GNU -

42 * Public lisence at http://fp.gladman.plus.com/AES/index.htm. It -

43 * includes a fast IA-32 assembly version. The OpenSSL crypo library is -

44 * the third. -

45 * -

46 * 5) With FORCE_C_ONLY flags set to 0, incorrect results are sometimes -

47 * produced under gcc with optimizations set -O3 or higher. Dunno why. -

48 * -

49 /////////////////////////////////////////////////////////////////////// */ -

50 -

51 /* ---------------------------------------------------------------------- */ -

52 /* --- User Switches ---------------------------------------------------- */ -

53 /* ---------------------------------------------------------------------- */ -

54 -

55 #ifndef UMAC_OUTPUT_LEN -

56 #define UMAC_OUTPUT_LEN 8 /* Alowable: 4, 8, 12, 16 */ -

57 #endif -

58 -

59 #if UMAC_OUTPUT_LEN != 4 && UMAC_OUTPUT_LEN != 8 && \ -

60 UMAC_OUTPUT_LEN != 12 && UMAC_OUTPUT_LEN != 16 -

61 # error UMAC_OUTPUT_LEN must be defined to 4, 8, 12 or 16 -

62 #endif -

63 -

64 /* #define FORCE_C_ONLY 1 ANSI C and 64-bit integers req'd */ -

65 /* #define AES_IMPLEMENTAION 1 1 = OpenSSL, 2 = Barreto, 3 = Gladman */ -

66 /* #define SSE2 0 Is SSE2 is available? */ -

67 /* #define RUN_TESTS 0 Run basic correctness/speed tests */ -

68 /* #define UMAC_AE_SUPPORT 0 Enable authenticated encryption */ -

69 -

70 /* ---------------------------------------------------------------------- */ -

71 /* -- Global Includes --------------------------------------------------- */ -

72 /* ---------------------------------------------------------------------- */ -

73 -

74 #include "includes.h" -

75 #include <sys/types.h> -

76 #include <string.h> -

77 #include <stdio.h> -

78 #include <stdlib.h> -

79 #include <stddef.h> -

80 -

81 #include "xmalloc.h" -

82 #include "umac.h" -

83 #include "misc.h" -

84 -

85 /* ---------------------------------------------------------------------- */ -

86 /* --- Primitive Data Types --- */ -

87 /* ---------------------------------------------------------------------- */ -

88 -

89 /* The following assumptions may need change on your system */ -

90 typedef u_int8_t UINT8; /* 1 byte */ -

91 typedef u_int16_t UINT16; /* 2 byte */ -

92 typedef u_int32_t UINT32; /* 4 byte */ -

93 typedef u_int64_t UINT64; /* 8 bytes */ -

94 typedef unsigned int UWORD; /* Register */ -

95 -

96 /* ---------------------------------------------------------------------- */ -

97 /* --- Constants -------------------------------------------------------- */ -

98 /* ---------------------------------------------------------------------- */ -

99 -

100 #define UMAC_KEY_LEN 16 /* UMAC takes 16 bytes of external key */ -

101 -

102 /* Message "words" are read from memory in an endian-specific manner. */ -

103 /* For this implementation to behave correctly, __LITTLE_ENDIAN__ must */ -

104 /* be set true if the host computer is little-endian. */ -

105 -

106 #if BYTE_ORDER == LITTLE_ENDIAN -

107 #define __LITTLE_ENDIAN__ 1 -

108 #else -

109 #define __LITTLE_ENDIAN__ 0 -

110 #endif -

111 -

112 /* ---------------------------------------------------------------------- */ -

113 /* ---------------------------------------------------------------------- */ -

114 /* ----- Architecture Specific ------------------------------------------ */ -

115 /* ---------------------------------------------------------------------- */ -

116 /* ---------------------------------------------------------------------- */ -

117 -

118 -

119 /* ---------------------------------------------------------------------- */ -

120 /* ---------------------------------------------------------------------- */ -

121 /* ----- Primitive Routines --------------------------------------------- */ -

122 /* ---------------------------------------------------------------------- */ -

123 /* ---------------------------------------------------------------------- */ -

124 -

125 -

126 /* ---------------------------------------------------------------------- */ -

127 /* --- 32-bit by 32-bit to 64-bit Multiplication ------------------------ */ -

128 /* ---------------------------------------------------------------------- */ -

129 -

130 #define MUL64(a,b) ((UINT64)((UINT64)(UINT32)(a) * (UINT64)(UINT32)(b))) -

131 -

132 /* ---------------------------------------------------------------------- */ -

133 /* --- Endian Conversion --- Forcing assembly on some platforms */ -

134 /* ---------------------------------------------------------------------- */ -

135 -

136 #if (__LITTLE_ENDIAN__) -

137 #define LOAD_UINT32_REVERSED(p) get_u32(p) -

138 #define STORE_UINT32_REVERSED(p,v) put_u32(p,v) -

139 #else -

140 #define LOAD_UINT32_REVERSED(p) get_u32_le(p) -

141 #define STORE_UINT32_REVERSED(p,v) put_u32_le(p,v) -

142 #endif -

143 -

144 #define LOAD_UINT32_LITTLE(p) (get_u32_le(p)) -

145 #define STORE_UINT32_BIG(p,v) put_u32(p, v) -

146 -

147 /* ---------------------------------------------------------------------- */ -

148 /* ---------------------------------------------------------------------- */ -

149 /* ----- Begin KDF & PDF Section ---------------------------------------- */ -

150 /* ---------------------------------------------------------------------- */ -

151 /* ---------------------------------------------------------------------- */ -

152 -

153 /* UMAC uses AES with 16 byte block and key lengths */ -

154 #define AES_BLOCK_LEN 16 -

155 -

156 /* OpenSSL's AES */ -

157 #ifdef WITH_OPENSSL -

158 #include "openbsd-compat/openssl-compat.h" -

159 #ifndef USE_BUILTIN_RIJNDAEL -

160 # include <openssl/aes.h> -

161 #endif -

162 typedef AES_KEY aes_int_key[1]; -

163 #define aes_encryption(in,out,int_key) \ -

164 AES_encrypt((u_char *)(in),(u_char *)(out),(AES_KEY *)int_key) -

165 #define aes_key_setup(key,int_key) \ -

166 AES_set_encrypt_key((const u_char *)(key),UMAC_KEY_LEN*8,int_key) -

167 #else -

168 #include "rijndael.h" -

169 #define AES_ROUNDS ((UMAC_KEY_LEN / 4) + 6) -

170 typedef UINT8 aes_int_key[AES_ROUNDS+1][4][4]; /* AES internal */ -

171 #define aes_encryption(in,out,int_key) \ -

172 rijndaelEncrypt((u32 *)(int_key), AES_ROUNDS, (u8 *)(in), (u8 *)(out)) -

173 #define aes_key_setup(key,int_key) \ -

174 rijndaelKeySetupEnc((u32 *)(int_key), (const unsigned char *)(key), \ -

175 UMAC_KEY_LEN*8) -

176 #endif -

177 -

178 /* The user-supplied UMAC key is stretched using AES in a counter -

179 * mode to supply all random bits needed by UMAC. The kdf function takes -

180 * an AES internal key representation 'key' and writes a stream of -

181 * 'nbytes' bytes to the memory pointed at by 'bufp'. Each distinct -

182 * 'ndx' causes a distinct byte stream. -

183 */ -

184 static void kdf(void *bufp, aes_int_key key, UINT8 ndx, int nbytes) -

185 { -

186 UINT8 in_buf[AES_BLOCK_LEN] = {0}; -

187 UINT8 out_buf[AES_BLOCK_LEN]; -

188 UINT8 *dst_buf = (UINT8 *)bufp; -

189 int i; -

190 -

191 /* Setup the initial value */ -

192 in_buf[AES_BLOCK_LEN-9] = ndx; -

193 in_buf[AES_BLOCK_LEN-1] = i = 1; -

194 -

195

while (nbytes >= AES_BLOCK_LEN) {

nbytes >= 16	Description
TRUE	never evaluated
FALSE	never evaluated

196 aes_encryption(in_buf, out_buf, key); -

197 memcpy(dst_buf,out_buf,AES_BLOCK_LEN); -

198 in_buf[AES_BLOCK_LEN-1] = ++i; -

199 nbytes -= AES_BLOCK_LEN; -

200 dst_buf += AES_BLOCK_LEN; -

201

}

never executed: end of block

202

if (nbytes) {

nbytes	Description
TRUE	never evaluated
FALSE	never evaluated

203 aes_encryption(in_buf, out_buf, key); -

204 memcpy(dst_buf,out_buf,nbytes); -

205

}

never executed: end of block

206 explicit_bzero(in_buf, sizeof(in_buf)); -

207 explicit_bzero(out_buf, sizeof(out_buf)); -

208

}

never executed: end of block

209 -

210 /* The final UHASH result is XOR'd with the output of a pseudorandom -

211 * function. Here, we use AES to generate random output and -

212 * xor the appropriate bytes depending on the last bits of nonce. -

213 * This scheme is optimized for sequential, increasing big-endian nonces. -

214 */ -

215 -

216 typedef struct { -

217 UINT8 cache[AES_BLOCK_LEN]; /* Previous AES output is saved */ -

218 UINT8 nonce[AES_BLOCK_LEN]; /* The AES input making above cache */ -

219 aes_int_key prf_key; /* Expanded AES key for PDF */ -

220 } pdf_ctx; -

221 -

222 static void pdf_init(pdf_ctx *pc, aes_int_key prf_key) -

223 { -

224 UINT8 buf[UMAC_KEY_LEN]; -

225 -

226 kdf(buf, prf_key, 0, UMAC_KEY_LEN); -

227 aes_key_setup(buf, pc->prf_key); -

228 -

229 /* Initialize pdf and cache */ -

230 memset(pc->nonce, 0, sizeof(pc->nonce)); -

231 aes_encryption(pc->nonce, pc->cache, pc->prf_key); -

232 explicit_bzero(buf, sizeof(buf)); -

233

}

never executed: end of block

234 -

235 static void pdf_gen_xor(pdf_ctx *pc, const UINT8 nonce[8], UINT8 buf[8]) -

236 { -

237 /* 'ndx' indicates that we'll be using the 0th or 1st eight bytes -

238 * of the AES output. If last time around we returned the ndx-1st -

239 * element, then we may have the result in the cache already. -

240 */ -

241 -

242 #if (UMAC_OUTPUT_LEN == 4) -

243 #define LOW_BIT_MASK 3 -

244 #elif (UMAC_OUTPUT_LEN == 8) -

245 #define LOW_BIT_MASK 1 -

246 #elif (UMAC_OUTPUT_LEN > 8) -

247 #define LOW_BIT_MASK 0 -

248 #endif -

249 union { -

250 UINT8 tmp_nonce_lo[4]; -

251 UINT32 align; -

252 } t; -

253 #if LOW_BIT_MASK != 0 -

254 int ndx = nonce[7] & LOW_BIT_MASK; -

255 #endif -

256 *(UINT32 *)t.tmp_nonce_lo = ((const UINT32 *)nonce)[1]; -

257 t.tmp_nonce_lo[3] &= ~LOW_BIT_MASK; /* zero last bit */ -

258 -

259

if ( (((UINT32 *)t.tmp_nonce_lo)[0] != ((UINT32 *)pc->nonce)[1]) ||

(((UINT32 *)t....pc->nonce)[1])	Description
TRUE	never evaluated
FALSE	never evaluated

260

(((const UINT32 *)nonce)[0] != ((UINT32 *)pc->nonce)[0]) )

(((const UINT3...pc->nonce)[0])	Description
TRUE	never evaluated
FALSE	never evaluated

261 { -

262 ((UINT32 *)pc->nonce)[0] = ((const UINT32 *)nonce)[0]; -

263 ((UINT32 *)pc->nonce)[1] = ((UINT32 *)t.tmp_nonce_lo)[0]; -

264 aes_encryption(pc->nonce, pc->cache, pc->prf_key); -

265

}

never executed: end of block

266 -

267 #if (UMAC_OUTPUT_LEN == 4) -

268 *((UINT32 *)buf) ^= ((UINT32 *)pc->cache)[ndx]; -

269 #elif (UMAC_OUTPUT_LEN == 8) -

270 *((UINT64 *)buf) ^= ((UINT64 *)pc->cache)[ndx]; -

271 #elif (UMAC_OUTPUT_LEN == 12) -

272 ((UINT64 *)buf)[0] ^= ((UINT64 *)pc->cache)[0]; -

273 ((UINT32 *)buf)[2] ^= ((UINT32 *)pc->cache)[2]; -

274 #elif (UMAC_OUTPUT_LEN == 16) -

275 ((UINT64 *)buf)[0] ^= ((UINT64 *)pc->cache)[0]; -

276 ((UINT64 *)buf)[1] ^= ((UINT64 *)pc->cache)[1]; -

277 #endif -

278

}

never executed: end of block

279 -

280 /* ---------------------------------------------------------------------- */ -

281 /* ---------------------------------------------------------------------- */ -

282 /* ----- Begin NH Hash Section ------------------------------------------ */ -

283 /* ---------------------------------------------------------------------- */ -

284 /* ---------------------------------------------------------------------- */ -

285 -

286 /* The NH-based hash functions used in UMAC are described in the UMAC paper -

287 * and specification, both of which can be found at the UMAC website. -

288 * The interface to this implementation has two -

289 * versions, one expects the entire message being hashed to be passed -

290 * in a single buffer and returns the hash result immediately. The second -

291 * allows the message to be passed in a sequence of buffers. In the -

292 * muliple-buffer interface, the client calls the routine nh_update() as -

293 * many times as necessary. When there is no more data to be fed to the -

294 * hash, the client calls nh_final() which calculates the hash output. -

295 * Before beginning another hash calculation the nh_reset() routine -

296 * must be called. The single-buffer routine, nh(), is equivalent to -

297 * the sequence of calls nh_update() and nh_final(); however it is -

298 * optimized and should be preferred whenever the multiple-buffer interface -

299 * is not necessary. When using either interface, it is the client's -

300 * responsibility to pass no more than L1_KEY_LEN bytes per hash result. -

301 * -

302 * The routine nh_init() initializes the nh_ctx data structure and -

303 * must be called once, before any other PDF routine. -

304 */ -

305 -

306 /* The "nh_aux" routines do the actual NH hashing work. They -

307 * expect buffers to be multiples of L1_PAD_BOUNDARY. These routines -

308 * produce output for all STREAMS NH iterations in one call, -

309 * allowing the parallel implementation of the streams. -

310 */ -

311 -

312 #define STREAMS (UMAC_OUTPUT_LEN / 4) /* Number of times hash is applied */ -

313 #define L1_KEY_LEN 1024 /* Internal key bytes */ -

314 #define L1_KEY_SHIFT 16 /* Toeplitz key shift between streams */ -

315 #define L1_PAD_BOUNDARY 32 /* pad message to boundary multiple */ -

316 #define ALLOC_BOUNDARY 16 /* Keep buffers aligned to this */ -

317 #define HASH_BUF_BYTES 64 /* nh_aux_hb buffer multiple */ -

318 -

319 typedef struct { -

320 UINT8 nh_key [L1_KEY_LEN + L1_KEY_SHIFT * (STREAMS - 1)]; /* NH Key */ -

321 UINT8 data [HASH_BUF_BYTES]; /* Incoming data buffer */ -

322 int next_data_empty; /* Bookkeeping variable for data buffer. */ -

323 int bytes_hashed; /* Bytes (out of L1_KEY_LEN) incorporated. */ -

324 UINT64 state[STREAMS]; /* on-line state */ -

325 } nh_ctx; -

326 -

327 -

328 #if (UMAC_OUTPUT_LEN == 4) -

329 -

330 static void nh_aux(void *kp, const void *dp, void *hp, UINT32 dlen) -

331 /* NH hashing primitive. Previous (partial) hash result is loaded and -

332 * then stored via hp pointer. The length of the data pointed at by "dp", -

333 * "dlen", is guaranteed to be divisible by L1_PAD_BOUNDARY (32). Key -

334 * is expected to be endian compensated in memory at key setup. -

335 */ -

336 { -

337 UINT64 h; -

338 UWORD c = dlen / 32; -

339 UINT32 *k = (UINT32 *)kp; -

340 const UINT32 *d = (const UINT32 *)dp; -

341 UINT32 d0,d1,d2,d3,d4,d5,d6,d7; -

342 UINT32 k0,k1,k2,k3,k4,k5,k6,k7; -

343 -

344 h = *((UINT64 *)hp); -

345 do { -

346 d0 = LOAD_UINT32_LITTLE(d+0); d1 = LOAD_UINT32_LITTLE(d+1); -

347 d2 = LOAD_UINT32_LITTLE(d+2); d3 = LOAD_UINT32_LITTLE(d+3); -

348 d4 = LOAD_UINT32_LITTLE(d+4); d5 = LOAD_UINT32_LITTLE(d+5); -

349 d6 = LOAD_UINT32_LITTLE(d+6); d7 = LOAD_UINT32_LITTLE(d+7); -

350 k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3); -

351 k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7); -

352 h += MUL64((k0 + d0), (k4 + d4)); -

353 h += MUL64((k1 + d1), (k5 + d5)); -

354 h += MUL64((k2 + d2), (k6 + d6)); -

355 h += MUL64((k3 + d3), (k7 + d7)); -

356 -

357 d += 8; -

358 k += 8; -

359 } while (--c); -

360 *((UINT64 *)hp) = h; -

361 } -

362 -

363 #elif (UMAC_OUTPUT_LEN == 8) -

364 -

365 static void nh_aux(void *kp, const void *dp, void *hp, UINT32 dlen) -

366 /* Same as previous nh_aux, but two streams are handled in one pass, -

367 * reading and writing 16 bytes of hash-state per call. -

368 */ -

369 { -

370 UINT64 h1,h2; -

371 UWORD c = dlen / 32; -

372 UINT32 *k = (UINT32 *)kp; -

373 const UINT32 *d = (const UINT32 *)dp; -

374 UINT32 d0,d1,d2,d3,d4,d5,d6,d7; -

375 UINT32 k0,k1,k2,k3,k4,k5,k6,k7, -

376 k8,k9,k10,k11; -

377 -

378 h1 = *((UINT64 *)hp); -

379 h2 = *((UINT64 *)hp + 1); -

380 k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3); -

381 do { -

382 d0 = LOAD_UINT32_LITTLE(d+0); d1 = LOAD_UINT32_LITTLE(d+1); -

383 d2 = LOAD_UINT32_LITTLE(d+2); d3 = LOAD_UINT32_LITTLE(d+3); -

384 d4 = LOAD_UINT32_LITTLE(d+4); d5 = LOAD_UINT32_LITTLE(d+5); -

385 d6 = LOAD_UINT32_LITTLE(d+6); d7 = LOAD_UINT32_LITTLE(d+7); -

386 k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7); -

387 k8 = *(k+8); k9 = *(k+9); k10 = *(k+10); k11 = *(k+11); -

388 -

389 h1 += MUL64((k0 + d0), (k4 + d4)); -

390 h2 += MUL64((k4 + d0), (k8 + d4)); -

391 -

392 h1 += MUL64((k1 + d1), (k5 + d5)); -

393 h2 += MUL64((k5 + d1), (k9 + d5)); -

394 -

395 h1 += MUL64((k2 + d2), (k6 + d6)); -

396 h2 += MUL64((k6 + d2), (k10 + d6)); -

397 -

398 h1 += MUL64((k3 + d3), (k7 + d7)); -

399 h2 += MUL64((k7 + d3), (k11 + d7)); -

400 -

401 k0 = k8; k1 = k9; k2 = k10; k3 = k11; -

402 -

403 d += 8; -

404 k += 8; -

405 } while (--c); -

406 ((UINT64 *)hp)[0] = h1; -

407 ((UINT64 *)hp)[1] = h2; -

408 } -

409 -

410 #elif (UMAC_OUTPUT_LEN == 12) -

411 -

412 static void nh_aux(void *kp, const void *dp, void *hp, UINT32 dlen) -

413 /* Same as previous nh_aux, but two streams are handled in one pass, -

414 * reading and writing 24 bytes of hash-state per call. -

415 */ -

416 { -

417 UINT64 h1,h2,h3; -

418 UWORD c = dlen / 32; -

419 UINT32 *k = (UINT32 *)kp; -

420 const UINT32 *d = (const UINT32 *)dp; -

421 UINT32 d0,d1,d2,d3,d4,d5,d6,d7; -

422 UINT32 k0,k1,k2,k3,k4,k5,k6,k7, -

423 k8,k9,k10,k11,k12,k13,k14,k15; -

424 -

425 h1 = *((UINT64 *)hp); -

426 h2 = *((UINT64 *)hp + 1); -

427 h3 = *((UINT64 *)hp + 2); -

428 k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3); -

429 k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7); -

430 do { -

431 d0 = LOAD_UINT32_LITTLE(d+0); d1 = LOAD_UINT32_LITTLE(d+1); -

432 d2 = LOAD_UINT32_LITTLE(d+2); d3 = LOAD_UINT32_LITTLE(d+3); -

433 d4 = LOAD_UINT32_LITTLE(d+4); d5 = LOAD_UINT32_LITTLE(d+5); -

434 d6 = LOAD_UINT32_LITTLE(d+6); d7 = LOAD_UINT32_LITTLE(d+7); -

435 k8 = *(k+8); k9 = *(k+9); k10 = *(k+10); k11 = *(k+11); -

436 k12 = *(k+12); k13 = *(k+13); k14 = *(k+14); k15 = *(k+15); -

437 -

438 h1 += MUL64((k0 + d0), (k4 + d4)); -

439 h2 += MUL64((k4 + d0), (k8 + d4)); -

440 h3 += MUL64((k8 + d0), (k12 + d4)); -

441 -

442 h1 += MUL64((k1 + d1), (k5 + d5)); -

443 h2 += MUL64((k5 + d1), (k9 + d5)); -

444 h3 += MUL64((k9 + d1), (k13 + d5)); -

445 -

446 h1 += MUL64((k2 + d2), (k6 + d6)); -

447 h2 += MUL64((k6 + d2), (k10 + d6)); -

448 h3 += MUL64((k10 + d2), (k14 + d6)); -

449 -

450 h1 += MUL64((k3 + d3), (k7 + d7)); -

451 h2 += MUL64((k7 + d3), (k11 + d7)); -

452 h3 += MUL64((k11 + d3), (k15 + d7)); -

453 -

454 k0 = k8; k1 = k9; k2 = k10; k3 = k11; -

455 k4 = k12; k5 = k13; k6 = k14; k7 = k15; -

456 -

457 d += 8; -

458 k += 8; -

459 } while (--c); -

460 ((UINT64 *)hp)[0] = h1; -

461 ((UINT64 *)hp)[1] = h2; -

462 ((UINT64 *)hp)[2] = h3; -

463 } -

464 -

465 #elif (UMAC_OUTPUT_LEN == 16) -

466 -

467 static void nh_aux(void *kp, const void *dp, void *hp, UINT32 dlen) -

468 /* Same as previous nh_aux, but two streams are handled in one pass, -

469 * reading and writing 24 bytes of hash-state per call. -

470 */ -

471 { -

472 UINT64 h1,h2,h3,h4; -

473 UWORD c = dlen / 32; -

474 UINT32 *k = (UINT32 *)kp; -

475 const UINT32 *d = (const UINT32 *)dp; -

476 UINT32 d0,d1,d2,d3,d4,d5,d6,d7; -

477 UINT32 k0,k1,k2,k3,k4,k5,k6,k7, -

478 k8,k9,k10,k11,k12,k13,k14,k15, -

479 k16,k17,k18,k19; -

480 -

481 h1 = *((UINT64 *)hp); -

482 h2 = *((UINT64 *)hp + 1); -

483 h3 = *((UINT64 *)hp + 2); -

484 h4 = *((UINT64 *)hp + 3); -

485 k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3); -

486 k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7); -

487 do { -

488 d0 = LOAD_UINT32_LITTLE(d+0); d1 = LOAD_UINT32_LITTLE(d+1); -

489 d2 = LOAD_UINT32_LITTLE(d+2); d3 = LOAD_UINT32_LITTLE(d+3); -

490 d4 = LOAD_UINT32_LITTLE(d+4); d5 = LOAD_UINT32_LITTLE(d+5); -

491 d6 = LOAD_UINT32_LITTLE(d+6); d7 = LOAD_UINT32_LITTLE(d+7); -

492 k8 = *(k+8); k9 = *(k+9); k10 = *(k+10); k11 = *(k+11); -

493 k12 = *(k+12); k13 = *(k+13); k14 = *(k+14); k15 = *(k+15); -

494 k16 = *(k+16); k17 = *(k+17); k18 = *(k+18); k19 = *(k+19); -

495 -

496 h1 += MUL64((k0 + d0), (k4 + d4)); -

497 h2 += MUL64((k4 + d0), (k8 + d4)); -

498 h3 += MUL64((k8 + d0), (k12 + d4)); -

499 h4 += MUL64((k12 + d0), (k16 + d4)); -

500 -

501 h1 += MUL64((k1 + d1), (k5 + d5)); -

502 h2 += MUL64((k5 + d1), (k9 + d5)); -

503 h3 += MUL64((k9 + d1), (k13 + d5)); -

504 h4 += MUL64((k13 + d1), (k17 + d5)); -

505 -

506 h1 += MUL64((k2 + d2), (k6 + d6)); -

507 h2 += MUL64((k6 + d2), (k10 + d6)); -

508 h3 += MUL64((k10 + d2), (k14 + d6)); -

509 h4 += MUL64((k14 + d2), (k18 + d6)); -

510 -

511 h1 += MUL64((k3 + d3), (k7 + d7)); -

512 h2 += MUL64((k7 + d3), (k11 + d7)); -

513 h3 += MUL64((k11 + d3), (k15 + d7)); -

514 h4 += MUL64((k15 + d3), (k19 + d7)); -

515 -

516 k0 = k8; k1 = k9; k2 = k10; k3 = k11; -

517 k4 = k12; k5 = k13; k6 = k14; k7 = k15; -

518 k8 = k16; k9 = k17; k10 = k18; k11 = k19; -

519 -

520 d += 8; -

521 k += 8; -

522

} while (--c);

never executed: end of block

--c	Description
TRUE	never evaluated
FALSE	never evaluated

523 ((UINT64 *)hp)[0] = h1; -

524 ((UINT64 *)hp)[1] = h2; -

525 ((UINT64 *)hp)[2] = h3; -

526 ((UINT64 *)hp)[3] = h4; -

527

}

never executed: end of block

528 -

529 /* ---------------------------------------------------------------------- */ -

530 #endif /* UMAC_OUTPUT_LENGTH */ -

531 /* ---------------------------------------------------------------------- */ -

532 -

533 -

534 /* ---------------------------------------------------------------------- */ -

535 -

536 static void nh_transform(nh_ctx *hc, const UINT8 *buf, UINT32 nbytes) -

537 /* This function is a wrapper for the primitive NH hash functions. It takes -

538 * as argument "hc" the current hash context and a buffer which must be a -

539 * multiple of L1_PAD_BOUNDARY. The key passed to nh_aux is offset -

540 * appropriately according to how much message has been hashed already. -

541 */ -

542 { -

543 UINT8 *key; -

544 -

545 key = hc->nh_key + hc->bytes_hashed; -

546 nh_aux(key, buf, hc->state, nbytes); -

547

}

never executed: end of block

548 -

549 /* ---------------------------------------------------------------------- */ -

550 -

551 #if (__LITTLE_ENDIAN__) -

552 static void endian_convert(void *buf, UWORD bpw, UINT32 num_bytes) -

553 /* We endian convert the keys on little-endian computers to */ -

554 /* compensate for the lack of big-endian memory reads during hashing. */ -

555 { -

556 UWORD iters = num_bytes / bpw; -

557

if (bpw == 4) {

bpw == 4	Description
TRUE	never evaluated
FALSE	never evaluated

558 UINT32 *p = (UINT32 *)buf; -

559 do { -

560 *p = LOAD_UINT32_REVERSED(p); -

561 p++; -

562

} while (--iters);

never executed: end of block

--iters	Description
TRUE	never evaluated
FALSE	never evaluated

563

} else if (bpw == 8) {

never executed: end of block

bpw == 8	Description
TRUE	never evaluated
FALSE	never evaluated

564 UINT32 *p = (UINT32 *)buf; -

565 UINT32 t; -

566 do { -

567 t = LOAD_UINT32_REVERSED(p+1); -

568 p[1] = LOAD_UINT32_REVERSED(p); -

569 p[0] = t; -

570 p += 2; -

571

} while (--iters);

never executed: end of block

--iters	Description
TRUE	never evaluated
FALSE	never evaluated

572

}

never executed: end of block

573

}

never executed: end of block

574 #define endian_convert_if_le(x,y,z) endian_convert((x),(y),(z)) -

575 #else -

576 #define endian_convert_if_le(x,y,z) do{}while(0) /* Do nothing */ -

577 #endif -

578 -

579 /* ---------------------------------------------------------------------- */ -

580 -

581 static void nh_reset(nh_ctx *hc) -

582 /* Reset nh_ctx to ready for hashing of new data */ -

583 { -

584 hc->bytes_hashed = 0; -

585 hc->next_data_empty = 0; -

586 hc->state[0] = 0; -

587 #if (UMAC_OUTPUT_LEN >= 8) -

588 hc->state[1] = 0; -

589 #endif -

590 #if (UMAC_OUTPUT_LEN >= 12) -

591 hc->state[2] = 0; -

592 #endif -

593 #if (UMAC_OUTPUT_LEN == 16) -

594 hc->state[3] = 0; -

595 #endif -

596 -

597

}

never executed: end of block

598 -

599 /* ---------------------------------------------------------------------- */ -

600 -

601 static void nh_init(nh_ctx *hc, aes_int_key prf_key) -

602 /* Generate nh_key, endian convert and reset to be ready for hashing. */ -

603 { -

604 kdf(hc->nh_key, prf_key, 1, sizeof(hc->nh_key)); -

605 endian_convert_if_le(hc->nh_key, 4, sizeof(hc->nh_key)); -

606 nh_reset(hc); -

607

}

never executed: end of block

608 -

609 /* ---------------------------------------------------------------------- */ -

610 -

611 static void nh_update(nh_ctx *hc, const UINT8 *buf, UINT32 nbytes) -

612 /* Incorporate nbytes of data into a nh_ctx, buffer whatever is not an */ -

613 /* even multiple of HASH_BUF_BYTES. */ -

614 { -

615 UINT32 i,j; -

616 -

617 j = hc->next_data_empty; -

618

if ((j + nbytes) >= HASH_BUF_BYTES) {

(j + nbytes) >= 64	Description
TRUE	never evaluated
FALSE	never evaluated

619

if (j) {

j	Description
TRUE	never evaluated
FALSE	never evaluated

620 i = HASH_BUF_BYTES - j; -

621 memcpy(hc->data+j, buf, i); -

622 nh_transform(hc,hc->data,HASH_BUF_BYTES); -

623 nbytes -= i; -

624 buf += i; -

625 hc->bytes_hashed += HASH_BUF_BYTES; -

626

}

never executed: end of block

627

if (nbytes >= HASH_BUF_BYTES) {

nbytes >= 64	Description
TRUE	never evaluated
FALSE	never evaluated

628 i = nbytes & ~(HASH_BUF_BYTES - 1); -

629 nh_transform(hc, buf, i); -

630 nbytes -= i; -

631 buf += i; -

632 hc->bytes_hashed += i; -

633

}

never executed: end of block

634 j = 0; -

635

}

never executed: end of block

636 memcpy(hc->data + j, buf, nbytes); -

637 hc->next_data_empty = j + nbytes; -

638

}

never executed: end of block

639 -

640 /* ---------------------------------------------------------------------- */ -

641 -

642 static void zero_pad(UINT8 *p, int nbytes) -

643 { -

644 /* Write "nbytes" of zeroes, beginning at "p" */ -

645

if (nbytes >= (int)sizeof(UWORD)) {

nbytes >= (int)sizeof(UWORD)	Description
TRUE	never evaluated
FALSE	never evaluated

646

while ((ptrdiff_t)p % sizeof(UWORD)) {

(ptrdiff_t)p % sizeof(UWORD)	Description
TRUE	never evaluated
FALSE	never evaluated

647 *p = 0; -

648 nbytes--; -

649 p++; -

650

}

never executed: end of block

651

while (nbytes >= (int)sizeof(UWORD)) {

nbytes >= (int)sizeof(UWORD)	Description
TRUE	never evaluated
FALSE	never evaluated

652 *(UWORD *)p = 0; -

653 nbytes -= sizeof(UWORD); -

654 p += sizeof(UWORD); -

655

}

never executed: end of block

656

}

never executed: end of block

657

while (nbytes) {

nbytes	Description
TRUE	never evaluated
FALSE	never evaluated

658 *p = 0; -

659 nbytes--; -

660 p++; -

661

}

never executed: end of block

662

}

never executed: end of block

663 -

664 /* ---------------------------------------------------------------------- */ -

665 -

666 static void nh_final(nh_ctx *hc, UINT8 *result) -

667 /* After passing some number of data buffers to nh_update() for integration -

668 * into an NH context, nh_final is called to produce a hash result. If any -

669 * bytes are in the buffer hc->data, incorporate them into the -

670 * NH context. Finally, add into the NH accumulation "state" the total number -

671 * of bits hashed. The resulting numbers are written to the buffer "result". -

672 * If nh_update was never called, L1_PAD_BOUNDARY zeroes are incorporated. -

673 */ -

674 { -

675 int nh_len, nbits; -

676 -

677

if (hc->next_data_empty != 0) {

hc->next_data_empty != 0	Description
TRUE	never evaluated
FALSE	never evaluated

678 nh_len = ((hc->next_data_empty + (L1_PAD_BOUNDARY - 1)) & -

679 ~(L1_PAD_BOUNDARY - 1)); -

680 zero_pad(hc->data + hc->next_data_empty, -

681 nh_len - hc->next_data_empty); -

682 nh_transform(hc, hc->data, nh_len); -

683 hc->bytes_hashed += hc->next_data_empty; -

684

} else if (hc->bytes_hashed == 0) {

never executed: end of block

hc->bytes_hashed == 0	Description
TRUE	never evaluated
FALSE	never evaluated

685 nh_len = L1_PAD_BOUNDARY; -

686 zero_pad(hc->data, L1_PAD_BOUNDARY); -

687 nh_transform(hc, hc->data, nh_len); -

688

}

never executed: end of block

689 -

690 nbits = (hc->bytes_hashed << 3); -

691 ((UINT64 *)result)[0] = ((UINT64 *)hc->state)[0] + nbits; -

692 #if (UMAC_OUTPUT_LEN >= 8) -

693 ((UINT64 *)result)[1] = ((UINT64 *)hc->state)[1] + nbits; -

694 #endif -

695 #if (UMAC_OUTPUT_LEN >= 12) -

696 ((UINT64 *)result)[2] = ((UINT64 *)hc->state)[2] + nbits; -

697 #endif -

698 #if (UMAC_OUTPUT_LEN == 16) -

699 ((UINT64 *)result)[3] = ((UINT64 *)hc->state)[3] + nbits; -

700 #endif -

701 nh_reset(hc); -

702

}

never executed: end of block

703 -

704 /* ---------------------------------------------------------------------- */ -

705 -

706 static void nh(nh_ctx *hc, const UINT8 *buf, UINT32 padded_len, -

707 UINT32 unpadded_len, UINT8 *result) -

708 /* All-in-one nh_update() and nh_final() equivalent. -

709 * Assumes that padded_len is divisible by L1_PAD_BOUNDARY and result is -

710 * well aligned -

711 */ -

712 { -

713 UINT32 nbits; -

714 -

715 /* Initialize the hash state */ -

716 nbits = (unpadded_len << 3); -

717 -

718 ((UINT64 *)result)[0] = nbits; -

719 #if (UMAC_OUTPUT_LEN >= 8) -

720 ((UINT64 *)result)[1] = nbits; -

721 #endif -

722 #if (UMAC_OUTPUT_LEN >= 12) -

723 ((UINT64 *)result)[2] = nbits; -

724 #endif -

725 #if (UMAC_OUTPUT_LEN == 16) -

726 ((UINT64 *)result)[3] = nbits; -

727 #endif -

728 -

729 nh_aux(hc->nh_key, buf, result, padded_len); -

730

}

never executed: end of block

731 -

732 /* ---------------------------------------------------------------------- */ -

733 /* ---------------------------------------------------------------------- */ -

734 /* ----- Begin UHASH Section -------------------------------------------- */ -

735 /* ---------------------------------------------------------------------- */ -

736 /* ---------------------------------------------------------------------- */ -

737 -

738 /* UHASH is a multi-layered algorithm. Data presented to UHASH is first -

739 * hashed by NH. The NH output is then hashed by a polynomial-hash layer -

740 * unless the initial data to be hashed is short. After the polynomial- -

741 * layer, an inner-product hash is used to produce the final UHASH output. -

742 * -

743 * UHASH provides two interfaces, one all-at-once and another where data -

744 * buffers are presented sequentially. In the sequential interface, the -

745 * UHASH client calls the routine uhash_update() as many times as necessary. -

746 * When there is no more data to be fed to UHASH, the client calls -

747 * uhash_final() which -

748 * calculates the UHASH output. Before beginning another UHASH calculation -

749 * the uhash_reset() routine must be called. The all-at-once UHASH routine, -

750 * uhash(), is equivalent to the sequence of calls uhash_update() and -

751 * uhash_final(); however it is optimized and should be -

752 * used whenever the sequential interface is not necessary. -

753 * -

754 * The routine uhash_init() initializes the uhash_ctx data structure and -

755 * must be called once, before any other UHASH routine. -

756 */ -

757 -

758 /* ---------------------------------------------------------------------- */ -

759 /* ----- Constants and uhash_ctx ---------------------------------------- */ -

760 /* ---------------------------------------------------------------------- */ -

761 -

762 /* ---------------------------------------------------------------------- */ -

763 /* ----- Poly hash and Inner-Product hash Constants --------------------- */ -

764 /* ---------------------------------------------------------------------- */ -

765 -

766 /* Primes and masks */ -

767 #define p36 ((UINT64)0x0000000FFFFFFFFBull) /* 2^36 - 5 */ -

768 #define p64 ((UINT64)0xFFFFFFFFFFFFFFC5ull) /* 2^64 - 59 */ -

769 #define m36 ((UINT64)0x0000000FFFFFFFFFull) /* The low 36 of 64 bits */ -

770 -

771 -

772 /* ---------------------------------------------------------------------- */ -

773 -

774 typedef struct uhash_ctx { -

775 nh_ctx hash; /* Hash context for L1 NH hash */ -

776 UINT64 poly_key_8[STREAMS]; /* p64 poly keys */ -

777 UINT64 poly_accum[STREAMS]; /* poly hash result */ -

778 UINT64 ip_keys[STREAMS*4]; /* Inner-product keys */ -

779 UINT32 ip_trans[STREAMS]; /* Inner-product translation */ -

780 UINT32 msg_len; /* Total length of data passed */ -

781 /* to uhash */ -

782 } uhash_ctx; -

783 typedef struct uhash_ctx *uhash_ctx_t; -

784 -

785 /* ---------------------------------------------------------------------- */ -

786 -

787 -

788 /* The polynomial hashes use Horner's rule to evaluate a polynomial one -

789 * word at a time. As described in the specification, poly32 and poly64 -

790 * require keys from special domains. The following implementations exploit -

791 * the special domains to avoid overflow. The results are not guaranteed to -

792 * be within Z_p32 and Z_p64, but the Inner-Product hash implementation -

793 * patches any errant values. -

794 */ -

795 -

796 static UINT64 poly64(UINT64 cur, UINT64 key, UINT64 data) -

797 { -

798 UINT32 key_hi = (UINT32)(key >> 32), -

799 key_lo = (UINT32)key, -

800 cur_hi = (UINT32)(cur >> 32), -

801 cur_lo = (UINT32)cur, -

802 x_lo, -

803 x_hi; -

804 UINT64 X,T,res; -

805 -

806 X = MUL64(key_hi, cur_lo) + MUL64(cur_hi, key_lo); -

807 x_lo = (UINT32)X; -

808 x_hi = (UINT32)(X >> 32); -

809 -

810 res = (MUL64(key_hi, cur_hi) + x_hi) * 59 + MUL64(key_lo, cur_lo); -

811 -

812 T = ((UINT64)x_lo << 32); -

813 res += T; -

814

if (res < T)

res < T	Description
TRUE	never evaluated
FALSE	never evaluated

815

res += 59;

never executed: res += 59;

816 -

817 res += data; -

818

if (res < data)

res < data	Description
TRUE	never evaluated
FALSE	never evaluated

819

res += 59;

never executed: res += 59;

820 -

821

return res;

never executed: return res;

822 } -

823 -

824 -

825 /* Although UMAC is specified to use a ramped polynomial hash scheme, this -

826 * implementation does not handle all ramp levels. Because we don't handle -

827 * the ramp up to p128 modulus in this implementation, we are limited to -

828 * 2^14 poly_hash() invocations per stream (for a total capacity of 2^24 -

829 * bytes input to UMAC per tag, ie. 16MB). -

830 */ -

831 static void poly_hash(uhash_ctx_t hc, UINT32 data_in[]) -

832 { -

833 int i; -

834 UINT64 *data=(UINT64*)data_in; -

835 -

836

for (i = 0; i < STREAMS; i++) {

i < (16 / 4)	Description
TRUE	never evaluated
FALSE	never evaluated

837

if ((UINT32)(data[i] >> 32) == 0xfffffffful) {

(UINT32)(data[...= 0xfffffffful	Description
TRUE	never evaluated
FALSE	never evaluated

838 hc->poly_accum[i] = poly64(hc->poly_accum[i], -

839 hc->poly_key_8[i], p64 - 1); -

840 hc->poly_accum[i] = poly64(hc->poly_accum[i], -

841 hc->poly_key_8[i], (data[i] - 59)); -

842

} else {

never executed: end of block

843 hc->poly_accum[i] = poly64(hc->poly_accum[i], -

844 hc->poly_key_8[i], data[i]); -

845

}

never executed: end of block

846 } -

847

}

never executed: end of block

848 -

849 -

850 /* ---------------------------------------------------------------------- */ -

851 -

852 -

853 /* The final step in UHASH is an inner-product hash. The poly hash -

854 * produces a result not necessarily WORD_LEN bytes long. The inner- -

855 * product hash breaks the polyhash output into 16-bit chunks and -

856 * multiplies each with a 36 bit key. -

857 */ -

858 -

859 static UINT64 ip_aux(UINT64 t, UINT64 *ipkp, UINT64 data) -

860 { -

861 t = t + ipkp[0] * (UINT64)(UINT16)(data >> 48); -

862 t = t + ipkp[1] * (UINT64)(UINT16)(data >> 32); -

863 t = t + ipkp[2] * (UINT64)(UINT16)(data >> 16); -

864 t = t + ipkp[3] * (UINT64)(UINT16)(data); -

865 -

866

return t;

never executed: return t;

867 } -

868 -

869 static UINT32 ip_reduce_p36(UINT64 t) -

870 { -

871 /* Divisionless modular reduction */ -

872 UINT64 ret; -

873 -

874 ret = (t & m36) + 5 * (t >> 36); -

875

if (ret >= p36)

ret >= ((UINT6...0FFFFFFFFBull)	Description
TRUE	never evaluated
FALSE	never evaluated

876

ret -= p36;

never executed: ret -= ((UINT64)0x0000000FFFFFFFFBull);

877 -

878 /* return least significant 32 bits */ -

879

return (UINT32)(ret);

never executed: return (UINT32)(ret);

880 } -

881 -

882 -

883 /* If the data being hashed by UHASH is no longer than L1_KEY_LEN, then -

884 * the polyhash stage is skipped and ip_short is applied directly to the -

885 * NH output. -

886 */ -

887 static void ip_short(uhash_ctx_t ahc, UINT8 *nh_res, u_char *res) -

888 { -

889 UINT64 t; -

890 UINT64 *nhp = (UINT64 *)nh_res; -

891 -

892 t = ip_aux(0,ahc->ip_keys, nhp[0]); -

893 STORE_UINT32_BIG((UINT32 *)res+0, ip_reduce_p36(t) ^ ahc->ip_trans[0]); -

894 #if (UMAC_OUTPUT_LEN >= 8) -

895 t = ip_aux(0,ahc->ip_keys+4, nhp[1]); -

896 STORE_UINT32_BIG((UINT32 *)res+1, ip_reduce_p36(t) ^ ahc->ip_trans[1]); -

897 #endif -

898 #if (UMAC_OUTPUT_LEN >= 12) -

899 t = ip_aux(0,ahc->ip_keys+8, nhp[2]); -

900 STORE_UINT32_BIG((UINT32 *)res+2, ip_reduce_p36(t) ^ ahc->ip_trans[2]); -

901 #endif -

902 #if (UMAC_OUTPUT_LEN == 16) -

903 t = ip_aux(0,ahc->ip_keys+12, nhp[3]); -

904 STORE_UINT32_BIG((UINT32 *)res+3, ip_reduce_p36(t) ^ ahc->ip_trans[3]); -

905 #endif -

906

}

never executed: end of block

907 -

908 /* If the data being hashed by UHASH is longer than L1_KEY_LEN, then -

909 * the polyhash stage is not skipped and ip_long is applied to the -

910 * polyhash output. -

911 */ -

912 static void ip_long(uhash_ctx_t ahc, u_char *res) -

913 { -

914 int i; -

915 UINT64 t; -

916 -

917

for (i = 0; i < STREAMS; i++) {

i < (16 / 4)	Description
TRUE	never evaluated
FALSE	never evaluated

918 /* fix polyhash output not in Z_p64 */ -

919

if (ahc->poly_accum[i] >= p64)

ahc->poly_accu...FFFFFFFFC5ull)	Description
TRUE	never evaluated
FALSE	never evaluated

920

ahc->poly_accum[i] -= p64;

never executed: ahc->poly_accum[i] -= ((UINT64)0xFFFFFFFFFFFFFFC5ull);

921 t = ip_aux(0,ahc->ip_keys+(i*4), ahc->poly_accum[i]); -

922 STORE_UINT32_BIG((UINT32 *)res+i, -

923 ip_reduce_p36(t) ^ ahc->ip_trans[i]); -

924

}

never executed: end of block

925

}

never executed: end of block

926 -

927 -

928 /* ---------------------------------------------------------------------- */ -

929 -

930 /* ---------------------------------------------------------------------- */ -

931 -

932 /* Reset uhash context for next hash session */ -

933 static int uhash_reset(uhash_ctx_t pc) -

934 { -

935 nh_reset(&pc->hash); -

936 pc->msg_len = 0; -

937 pc->poly_accum[0] = 1; -

938 #if (UMAC_OUTPUT_LEN >= 8) -

939 pc->poly_accum[1] = 1; -

940 #endif -

941 #if (UMAC_OUTPUT_LEN >= 12) -

942 pc->poly_accum[2] = 1; -

943 #endif -

944 #if (UMAC_OUTPUT_LEN == 16) -

945 pc->poly_accum[3] = 1; -

946 #endif -

947

return 1;

never executed: return 1;

948 } -

949 -

950 /* ---------------------------------------------------------------------- */ -

951 -

952 /* Given a pointer to the internal key needed by kdf() and a uhash context, -

953 * initialize the NH context and generate keys needed for poly and inner- -

954 * product hashing. All keys are endian adjusted in memory so that native -

955 * loads cause correct keys to be in registers during calculation. -

956 */ -

957 static void uhash_init(uhash_ctx_t ahc, aes_int_key prf_key) -

958 { -

959 int i; -

960 UINT8 buf[(8*STREAMS+4)*sizeof(UINT64)]; -

961 -

962 /* Zero the entire uhash context */ -

963 memset(ahc, 0, sizeof(uhash_ctx)); -

964 -

965 /* Initialize the L1 hash */ -

966 nh_init(&ahc->hash, prf_key); -

967 -

968 /* Setup L2 hash variables */ -

969 kdf(buf, prf_key, 2, sizeof(buf)); /* Fill buffer with index 1 key */ -

970

for (i = 0; i < STREAMS; i++) {

i < (16 / 4)	Description
TRUE	never evaluated
FALSE	never evaluated

971 /* Fill keys from the buffer, skipping bytes in the buffer not -

972 * used by this implementation. Endian reverse the keys if on a -

973 * little-endian computer. -

974 */ -

975 memcpy(ahc->poly_key_8+i, buf+24*i, 8); -

976 endian_convert_if_le(ahc->poly_key_8+i, 8, 8); -

977 /* Mask the 64-bit keys to their special domain */ -

978 ahc->poly_key_8[i] &= ((UINT64)0x01ffffffu << 32) + 0x01ffffffu; -

979 ahc->poly_accum[i] = 1; /* Our polyhash prepends a non-zero word */ -

980

}

never executed: end of block

981 -

982 /* Setup L3-1 hash variables */ -

983 kdf(buf, prf_key, 3, sizeof(buf)); /* Fill buffer with index 2 key */ -

984

for (i = 0; i < STREAMS; i++)

i < (16 / 4)	Description
TRUE	never evaluated
FALSE	never evaluated

985

memcpy(ahc->ip_keys+4*i, buf+(8*i+4)*sizeof(UINT64),

never executed: memcpy(ahc->ip_keys+4*i, buf+(8*i+4)*sizeof(UINT64), 4*sizeof(UINT64));

986

4*sizeof(UINT64));

never executed: memcpy(ahc->ip_keys+4*i, buf+(8*i+4)*sizeof(UINT64), 4*sizeof(UINT64));

987 endian_convert_if_le(ahc->ip_keys, sizeof(UINT64), -

988 sizeof(ahc->ip_keys)); -

989

for (i = 0; i < STREAMS*4; i++)

i < (16 / 4)*4	Description
TRUE	never evaluated
FALSE	never evaluated

990

ahc->ip_keys[i] %= p36; /* Bring into Z_p36 */

never executed: ahc->ip_keys[i] %= ((UINT64)0x0000000FFFFFFFFBull);

991 -

992 /* Setup L3-2 hash variables */ -

993 /* Fill buffer with index 4 key */ -

994 kdf(ahc->ip_trans, prf_key, 4, STREAMS * sizeof(UINT32)); -

995 endian_convert_if_le(ahc->ip_trans, sizeof(UINT32), -

996 STREAMS * sizeof(UINT32)); -

997 explicit_bzero(buf, sizeof(buf)); -

998

}

never executed: end of block

999 -

1000 /* ---------------------------------------------------------------------- */ -

1001 -

1002 #if 0 -

1003 static uhash_ctx_t uhash_alloc(u_char key[]) -

1004 { -

1005 /* Allocate memory and force to a 16-byte boundary. */ -

1006 uhash_ctx_t ctx; -

1007 u_char bytes_to_add; -

1008 aes_int_key prf_key; -

1009 -

1010 ctx = (uhash_ctx_t)malloc(sizeof(uhash_ctx)+ALLOC_BOUNDARY); -

1011 if (ctx) { -

1012 if (ALLOC_BOUNDARY) { -

1013 bytes_to_add = ALLOC_BOUNDARY - -

1014 ((ptrdiff_t)ctx & (ALLOC_BOUNDARY -1)); -

1015 ctx = (uhash_ctx_t)((u_char *)ctx + bytes_to_add); -

1016 *((u_char *)ctx - 1) = bytes_to_add; -

1017 } -

1018 aes_key_setup(key,prf_key); -

1019 uhash_init(ctx, prf_key); -

1020 } -

1021 return (ctx); -

1022 } -

1023 #endif -

1024 -

1025 /* ---------------------------------------------------------------------- */ -

1026 -

1027 #if 0 -

1028 static int uhash_free(uhash_ctx_t ctx) -

1029 { -

1030 /* Free memory allocated by uhash_alloc */ -

1031 u_char bytes_to_sub; -

1032 -

1033 if (ctx) { -

1034 if (ALLOC_BOUNDARY) { -

1035 bytes_to_sub = *((u_char *)ctx - 1); -

1036 ctx = (uhash_ctx_t)((u_char *)ctx - bytes_to_sub); -

1037 } -

1038 free(ctx); -

1039 } -

1040 return (1); -

1041 } -

1042 #endif -

1043 /* ---------------------------------------------------------------------- */ -

1044 -

1045 static int uhash_update(uhash_ctx_t ctx, const u_char *input, long len) -

1046 /* Given len bytes of data, we parse it into L1_KEY_LEN chunks and -

1047 * hash each one with NH, calling the polyhash on each NH output. -

1048 */ -

1049 { -

1050 UWORD bytes_hashed, bytes_remaining; -

1051 UINT64 result_buf[STREAMS]; -

1052 UINT8 *nh_result = (UINT8 *)&result_buf; -

1053 -

1054

if (ctx->msg_len + len <= L1_KEY_LEN) {

ctx->msg_len + len <= 1024	Description
TRUE	never evaluated
FALSE	never evaluated

1055 nh_update(&ctx->hash, (const UINT8 *)input, len); -

1056 ctx->msg_len += len; -

1057

} else {

never executed: end of block

1058 -

1059 bytes_hashed = ctx->msg_len % L1_KEY_LEN; -

1060

if (ctx->msg_len == L1_KEY_LEN)

ctx->msg_len == 1024	Description
TRUE	never evaluated
FALSE	never evaluated

1061

bytes_hashed = L1_KEY_LEN;

never executed: bytes_hashed = 1024;

1062 -

1063

if (bytes_hashed + len >= L1_KEY_LEN) {

bytes_hashed + len >= 1024	Description
TRUE	never evaluated
FALSE	never evaluated

1064 -

1065 /* If some bytes have been passed to the hash function */ -

1066 /* then we want to pass at most (L1_KEY_LEN - bytes_hashed) */ -

1067 /* bytes to complete the current nh_block. */ -

1068

if (bytes_hashed) {

bytes_hashed	Description
TRUE	never evaluated
FALSE	never evaluated

1069 bytes_remaining = (L1_KEY_LEN - bytes_hashed); -

1070 nh_update(&ctx->hash, (const UINT8 *)input, bytes_remaining); -

1071 nh_final(&ctx->hash, nh_result); -

1072 ctx->msg_len += bytes_remaining; -

1073 poly_hash(ctx,(UINT32 *)nh_result); -

1074 len -= bytes_remaining; -

1075 input += bytes_remaining; -

1076

}

never executed: end of block

1077 -

1078 /* Hash directly from input stream if enough bytes */ -

1079

while (len >= L1_KEY_LEN) {

len >= 1024	Description
TRUE	never evaluated
FALSE	never evaluated

1080 nh(&ctx->hash, (const UINT8 *)input, L1_KEY_LEN, -

1081 L1_KEY_LEN, nh_result); -

1082 ctx->msg_len += L1_KEY_LEN; -

1083 len -= L1_KEY_LEN; -

1084 input += L1_KEY_LEN; -

1085 poly_hash(ctx,(UINT32 *)nh_result); -

1086

}

never executed: end of block

1087

}

never executed: end of block

1088 -

1089 /* pass remaining < L1_KEY_LEN bytes of input data to NH */ -

1090

if (len) {

len	Description
TRUE	never evaluated
FALSE	never evaluated

1091 nh_update(&ctx->hash, (const UINT8 *)input, len); -

1092 ctx->msg_len += len; -

1093

}

never executed: end of block

1094

}

never executed: end of block

1095 -

1096

return (1);

never executed: return (1);

1097 } -

1098 -

1099 /* ---------------------------------------------------------------------- */ -

1100 -

1101 static int uhash_final(uhash_ctx_t ctx, u_char *res) -

1102 /* Incorporate any pending data, pad, and generate tag */ -

1103 { -

1104 UINT64 result_buf[STREAMS]; -

1105 UINT8 *nh_result = (UINT8 *)&result_buf; -

1106 -

1107

if (ctx->msg_len > L1_KEY_LEN) {

ctx->msg_len > 1024	Description
TRUE	never evaluated
FALSE	never evaluated

1108

if (ctx->msg_len % L1_KEY_LEN) {

ctx->msg_len % 1024	Description
TRUE	never evaluated
FALSE	never evaluated

1109 nh_final(&ctx->hash, nh_result); -

1110 poly_hash(ctx,(UINT32 *)nh_result); -

1111

}

never executed: end of block

1112 ip_long(ctx, res); -

1113

} else {

never executed: end of block

1114 nh_final(&ctx->hash, nh_result); -

1115 ip_short(ctx,nh_result, res); -

1116

}

never executed: end of block

1117 uhash_reset(ctx); -

1118

return (1);

never executed: return (1);

1119 } -

1120 -

1121 /* ---------------------------------------------------------------------- */ -

1122 -

1123 #if 0 -

1124 static int uhash(uhash_ctx_t ahc, u_char *msg, long len, u_char *res) -

1125 /* assumes that msg is in a writable buffer of length divisible by */ -

1126 /* L1_PAD_BOUNDARY. Bytes beyond msg[len] may be zeroed. */ -

1127 { -

1128 UINT8 nh_result[STREAMS*sizeof(UINT64)]; -

1129 UINT32 nh_len; -

1130 int extra_zeroes_needed; -

1131 -

1132 /* If the message to be hashed is no longer than L1_HASH_LEN, we skip -

1133 * the polyhash. -

1134 */ -

1135 if (len <= L1_KEY_LEN) { -

1136 if (len == 0) /* If zero length messages will not */ -

1137 nh_len = L1_PAD_BOUNDARY; /* be seen, comment out this case */ -

1138 else -

1139 nh_len = ((len + (L1_PAD_BOUNDARY - 1)) & ~(L1_PAD_BOUNDARY - 1)); -

1140 extra_zeroes_needed = nh_len - len; -

1141 zero_pad((UINT8 *)msg + len, extra_zeroes_needed); -

1142 nh(&ahc->hash, (UINT8 *)msg, nh_len, len, nh_result); -

1143 ip_short(ahc,nh_result, res); -

1144 } else { -

1145 /* Otherwise, we hash each L1_KEY_LEN chunk with NH, passing the NH -

1146 * output to poly_hash(). -

1147 */ -

1148 do { -

1149 nh(&ahc->hash, (UINT8 *)msg, L1_KEY_LEN, L1_KEY_LEN, nh_result); -

1150 poly_hash(ahc,(UINT32 *)nh_result); -

1151 len -= L1_KEY_LEN; -

1152 msg += L1_KEY_LEN; -

1153 } while (len >= L1_KEY_LEN); -

1154 if (len) { -

1155 nh_len = ((len + (L1_PAD_BOUNDARY - 1)) & ~(L1_PAD_BOUNDARY - 1)); -

1156 extra_zeroes_needed = nh_len - len; -

1157 zero_pad((UINT8 *)msg + len, extra_zeroes_needed); -

1158 nh(&ahc->hash, (UINT8 *)msg, nh_len, len, nh_result); -

1159 poly_hash(ahc,(UINT32 *)nh_result); -

1160 } -

1161 -

1162 ip_long(ahc, res); -

1163 } -

1164 -

1165 uhash_reset(ahc); -

1166 return 1; -

1167 } -

1168 #endif -

1169 -

1170 /* ---------------------------------------------------------------------- */ -

1171 /* ---------------------------------------------------------------------- */ -

1172 /* ----- Begin UMAC Section --------------------------------------------- */ -

1173 /* ---------------------------------------------------------------------- */ -

1174 /* ---------------------------------------------------------------------- */ -

1175 -

1176 /* The UMAC interface has two interfaces, an all-at-once interface where -

1177 * the entire message to be authenticated is passed to UMAC in one buffer, -

1178 * and a sequential interface where the message is presented a little at a -

1179 * time. The all-at-once is more optimaized than the sequential version and -

1180 * should be preferred when the sequential interface is not required. -

1181 */ -

1182 struct umac_ctx { -

1183 uhash_ctx hash; /* Hash function for message compression */ -

1184 pdf_ctx pdf; /* PDF for hashed output */ -

1185 void *free_ptr; /* Address to free this struct via */ -

1186 } umac_ctx; -

1187 -

1188 /* ---------------------------------------------------------------------- */ -

1189 -

1190 #if 0 -

1191 int umac_reset(struct umac_ctx *ctx) -

1192 /* Reset the hash function to begin a new authentication. */ -

1193 { -

1194 uhash_reset(&ctx->hash); -

1195 return (1); -

1196 } -

1197 #endif -

1198 -

1199 /* ---------------------------------------------------------------------- */ -

1200 -

1201 int umac_delete(struct umac_ctx *ctx) -

1202 /* Deallocate the ctx structure */ -

1203 { -

1204

if (ctx) {

ctx	Description
TRUE	never evaluated
FALSE	never evaluated

1205 if (ALLOC_BOUNDARY) -

1206

ctx = (struct umac_ctx *)ctx->free_ptr;

never executed: ctx = (struct umac128_ctx *)ctx->free_ptr;

1207 explicit_bzero(ctx, sizeof(*ctx) + ALLOC_BOUNDARY); -

1208 free(ctx); -

1209

}

never executed: end of block

1210

return (1);

never executed: return (1);

1211 } -

1212 -

1213 /* ---------------------------------------------------------------------- */ -

1214 -

1215 struct umac_ctx *umac_new(const u_char key[]) -

1216 /* Dynamically allocate a umac_ctx struct, initialize variables, -

1217 * generate subkeys from key. Align to 16-byte boundary. -

1218 */ -

1219 { -

1220 struct umac_ctx *ctx, *octx; -

1221 size_t bytes_to_add; -

1222 aes_int_key prf_key; -

1223 -

1224 octx = ctx = xcalloc(1, sizeof(*ctx) + ALLOC_BOUNDARY); -

1225

if (ctx) {

ctx	Description
TRUE	never evaluated
FALSE	never evaluated

1226 if (ALLOC_BOUNDARY) { -

1227 bytes_to_add = ALLOC_BOUNDARY - -

1228 ((ptrdiff_t)ctx & (ALLOC_BOUNDARY - 1)); -

1229 ctx = (struct umac_ctx *)((u_char *)ctx + bytes_to_add); -

1230

}

never executed: end of block

1231 ctx->free_ptr = octx; -

1232 aes_key_setup(key, prf_key); -

1233 pdf_init(&ctx->pdf, prf_key); -

1234 uhash_init(&ctx->hash, prf_key); -

1235 explicit_bzero(prf_key, sizeof(prf_key)); -

1236

}

never executed: end of block

1237 -

1238

return (ctx);

never executed: return (ctx);

1239 } -

1240 -

1241 /* ---------------------------------------------------------------------- */ -

1242 -

1243 int umac_final(struct umac_ctx *ctx, u_char tag[], const u_char nonce[8]) -

1244 /* Incorporate any pending data, pad, and generate tag */ -

1245 { -

1246 uhash_final(&ctx->hash, (u_char *)tag); -

1247 pdf_gen_xor(&ctx->pdf, (const UINT8 *)nonce, (UINT8 *)tag); -

1248 -

1249

return (1);

never executed: return (1);

1250 } -

1251 -

1252 /* ---------------------------------------------------------------------- */ -

1253 -

1254 int umac_update(struct umac_ctx *ctx, const u_char *input, long len) -

1255 /* Given len bytes of data, we parse it into L1_KEY_LEN chunks and */ -

1256 /* hash each one, calling the PDF on the hashed output whenever the hash- */ -

1257 /* output buffer is full. */ -

1258 { -

1259 uhash_update(&ctx->hash, input, len); -

1260

return (1);

never executed: return (1);

1261 } -

1262 -

1263 /* ---------------------------------------------------------------------- */ -

1264 -

1265 #if 0 -

1266 int umac(struct umac_ctx *ctx, u_char *input, -

1267 long len, u_char tag[], -

1268 u_char nonce[8]) -

1269 /* All-in-one version simply calls umac_update() and umac_final(). */ -

1270 { -

1271 uhash(&ctx->hash, input, len, (u_char *)tag); -

1272 pdf_gen_xor(&ctx->pdf, (UINT8 *)nonce, (UINT8 *)tag); -

1273 -

1274 return (1); -

1275 } -

1276 #endif -

1277 -

1278 /* ---------------------------------------------------------------------- */ -

1279 /* ---------------------------------------------------------------------- */ -

1280 /* ----- End UMAC Section ----------------------------------------------- */ -

1281 /* ---------------------------------------------------------------------- */ -

1282 /* ---------------------------------------------------------------------- */ -

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