1 /* $NetBSD: umac.c,v 1.2 2009/06/07 22:38:48 christos Exp $ */ 2 /* $OpenBSD: umac.c,v 1.3 2008/05/12 20:52:20 pvalchev Exp $ */ 3 /* ----------------------------------------------------------------------- 4 * 5 * umac.c -- C Implementation UMAC Message Authentication 6 * 7 * Version 0.93b of rfc4418.txt -- 2006 July 18 8 * 9 * For a full description of UMAC message authentication see the UMAC 10 * world-wide-web page at http://www.cs.ucdavis.edu/~rogaway/umac 11 * Please report bugs and suggestions to the UMAC webpage. 12 * 13 * Copyright (c) 1999-2006 Ted Krovetz 14 * 15 * Permission to use, copy, modify, and distribute this software and 16 * its documentation for any purpose and with or without fee, is hereby 17 * granted provided that the above copyright notice appears in all copies 18 * and in supporting documentation, and that the name of the copyright 19 * holder not be used in advertising or publicity pertaining to 20 * distribution of the software without specific, written prior permission. 21 * 22 * Comments should be directed to Ted Krovetz (tdk@acm.org) 23 * 24 * ---------------------------------------------------------------------- */ 25 26 /* ////////////////////// IMPORTANT NOTES ///////////////////////////////// 27 * 28 * 1) This version does not work properly on messages larger than 16MB 29 * 30 * 2) If you set the switch to use SSE2, then all data must be 16-byte 31 * aligned 32 * 33 * 3) When calling the function umac(), it is assumed that msg is in 34 * a writable buffer of length divisible by 32 bytes. The message itself 35 * does not have to fill the entire buffer, but bytes beyond msg may be 36 * zeroed. 37 * 38 * 4) Three free AES implementations are supported by this implementation of 39 * UMAC. Paulo Barreto's version is in the public domain and can be found 40 * at http://www.esat.kuleuven.ac.be/~rijmen/rijndael/ (search for 41 * "Barreto"). The only two files needed are rijndael-alg-fst.c and 42 * rijndael-alg-fst.h. Brian Gladman's version is distributed with the GNU 43 * Public lisence at http://fp.gladman.plus.com/AES/index.htm. It 44 * includes a fast IA-32 assembly version. The OpenSSL crypo library is 45 * the third. 46 * 47 * 5) With FORCE_C_ONLY flags set to 0, incorrect results are sometimes 48 * produced under gcc with optimizations set -O3 or higher. Dunno why. 49 * 50 /////////////////////////////////////////////////////////////////////// */ 51 52 /* ---------------------------------------------------------------------- */ 53 /* --- User Switches ---------------------------------------------------- */ 54 /* ---------------------------------------------------------------------- */ 55 56 #define UMAC_OUTPUT_LEN 8 /* Alowable: 4, 8, 12, 16 */ 57 /* #define FORCE_C_ONLY 1 ANSI C and 64-bit integers req'd */ 58 /* #define AES_IMPLEMENTAION 1 1 = OpenSSL, 2 = Barreto, 3 = Gladman */ 59 /* #define SSE2 0 Is SSE2 is available? */ 60 /* #define RUN_TESTS 0 Run basic correctness/speed tests */ 61 /* #define UMAC_AE_SUPPORT 0 Enable auhthenticated encrytion */ 62 63 /* ---------------------------------------------------------------------- */ 64 /* -- Global Includes --------------------------------------------------- */ 65 /* ---------------------------------------------------------------------- */ 66 67 #include "includes.h" 68 __RCSID("$NetBSD: umac.c,v 1.2 2009/06/07 22:38:48 christos Exp $"); 69 #include <sys/types.h> 70 #include <sys/endian.h> 71 72 #include "xmalloc.h" 73 #include "umac.h" 74 #include <string.h> 75 #include <stdlib.h> 76 #include <stddef.h> 77 78 /* ---------------------------------------------------------------------- */ 79 /* --- Primitive Data Types --- */ 80 /* ---------------------------------------------------------------------- */ 81 82 /* The following assumptions may need change on your system */ 83 typedef u_int8_t UINT8; /* 1 byte */ 84 typedef u_int16_t UINT16; /* 2 byte */ 85 typedef u_int32_t UINT32; /* 4 byte */ 86 typedef u_int64_t UINT64; /* 8 bytes */ 87 typedef unsigned int UWORD; /* Register */ 88 89 /* ---------------------------------------------------------------------- */ 90 /* --- Constants -------------------------------------------------------- */ 91 /* ---------------------------------------------------------------------- */ 92 93 #define UMAC_KEY_LEN 16 /* UMAC takes 16 bytes of external key */ 94 95 /* Message "words" are read from memory in an endian-specific manner. */ 96 /* For this implementation to behave correctly, __LITTLE_ENDIAN__ must */ 97 /* be set true if the host computer is little-endian. */ 98 99 #if BYTE_ORDER == LITTLE_ENDIAN 100 #define __LITTLE_ENDIAN__ 1 101 #else 102 #define __LITTLE_ENDIAN__ 0 103 #endif 104 105 /* ---------------------------------------------------------------------- */ 106 /* ---------------------------------------------------------------------- */ 107 /* ----- Architecture Specific ------------------------------------------ */ 108 /* ---------------------------------------------------------------------- */ 109 /* ---------------------------------------------------------------------- */ 110 111 112 /* ---------------------------------------------------------------------- */ 113 /* ---------------------------------------------------------------------- */ 114 /* ----- Primitive Routines --------------------------------------------- */ 115 /* ---------------------------------------------------------------------- */ 116 /* ---------------------------------------------------------------------- */ 117 118 119 /* ---------------------------------------------------------------------- */ 120 /* --- 32-bit by 32-bit to 64-bit Multiplication ------------------------ */ 121 /* ---------------------------------------------------------------------- */ 122 123 #define MUL64(a,b) ((UINT64)((UINT64)(UINT32)(a) * (UINT64)(UINT32)(b))) 124 125 #if defined(__NetBSD__) 126 #include <sys/endian.h> 127 #define LOAD_UINT32_LITTLE(ptr) le32toh(*ptr) 128 #define STORE_UINT32_BIG(ptr,x) (*(UINT32 *)(ptr) = htobe32(x)) 129 #define LOAD_UINT32_REVERSED(p) (bswap32(*(UINT32 *)(p))) 130 #define STORE_UINT32_REVERSED(p,v) (*(UINT32 *)(p) = bswap32(v)) 131 #else /* !NetBSD */ 132 133 /* ---------------------------------------------------------------------- */ 134 /* --- Endian Conversion --- Forcing assembly on some platforms */ 135 136 /* ---------------------------------------------------------------------- */ 137 /* --- Endian Conversion --- Forcing assembly on some platforms */ 138 /* ---------------------------------------------------------------------- */ 139 140 #if !defined(__OpenBSD__) 141 static UINT32 LOAD_UINT32_REVERSED(void *ptr) 142 { 143 UINT32 temp = *(UINT32 *)ptr; 144 temp = (temp >> 24) | ((temp & 0x00FF0000) >> 8 ) 145 | ((temp & 0x0000FF00) << 8 ) | (temp << 24); 146 return (UINT32)temp; 147 } 148 149 static void STORE_UINT32_REVERSED(void *ptr, UINT32 x) 150 { 151 UINT32 i = (UINT32)x; 152 *(UINT32 *)ptr = (i >> 24) | ((i & 0x00FF0000) >> 8 ) 153 | ((i & 0x0000FF00) << 8 ) | (i << 24); 154 } 155 #endif 156 157 #else 158 /* The following definitions use the above reversal-primitives to do the right 159 * thing on endian specific load and stores. 160 */ 161 162 #define LOAD_UINT32_REVERSED(p) (swap32(*(UINT32 *)(p))) 163 #define STORE_UINT32_REVERSED(p,v) (*(UINT32 *)(p) = swap32(v)) 164 #endif 165 166 #if (__LITTLE_ENDIAN__) 167 #define LOAD_UINT32_LITTLE(ptr) (*(UINT32 *)(ptr)) 168 #define STORE_UINT32_BIG(ptr,x) STORE_UINT32_REVERSED(ptr,x) 169 #else 170 #define LOAD_UINT32_LITTLE(ptr) LOAD_UINT32_REVERSED(ptr) 171 #define STORE_UINT32_BIG(ptr,x) (*(UINT32 *)(ptr) = (UINT32)(x)) 172 #endif 173 #endif /*!NetBSD*/ 174 175 176 177 /* ---------------------------------------------------------------------- */ 178 /* ---------------------------------------------------------------------- */ 179 /* ----- Begin KDF & PDF Section ---------------------------------------- */ 180 /* ---------------------------------------------------------------------- */ 181 /* ---------------------------------------------------------------------- */ 182 183 /* UMAC uses AES with 16 byte block and key lengths */ 184 #define AES_BLOCK_LEN 16 185 186 /* OpenSSL's AES */ 187 #include <openssl/aes.h> 188 typedef AES_KEY aes_int_key[1]; 189 #define aes_encryption(in,out,int_key) \ 190 AES_encrypt((u_char *)(in),(u_char *)(out),(AES_KEY *)int_key) 191 #define aes_key_setup(key,int_key) \ 192 AES_set_encrypt_key((u_char *)(key),UMAC_KEY_LEN*8,int_key) 193 194 /* The user-supplied UMAC key is stretched using AES in a counter 195 * mode to supply all random bits needed by UMAC. The kdf function takes 196 * an AES internal key representation 'key' and writes a stream of 197 * 'nbytes' bytes to the memory pointed at by 'buffer_ptr'. Each distinct 198 * 'ndx' causes a distinct byte stream. 199 */ 200 static void kdf(void *buffer_ptr, aes_int_key key, UINT8 ndx, int nbytes) 201 { 202 UINT8 in_buf[AES_BLOCK_LEN] = {0}; 203 UINT8 out_buf[AES_BLOCK_LEN]; 204 UINT8 *dst_buf = (UINT8 *)buffer_ptr; 205 int i; 206 207 /* Setup the initial value */ 208 in_buf[AES_BLOCK_LEN-9] = ndx; 209 in_buf[AES_BLOCK_LEN-1] = i = 1; 210 211 while (nbytes >= AES_BLOCK_LEN) { 212 aes_encryption(in_buf, out_buf, key); 213 memcpy(dst_buf,out_buf,AES_BLOCK_LEN); 214 in_buf[AES_BLOCK_LEN-1] = ++i; 215 nbytes -= AES_BLOCK_LEN; 216 dst_buf += AES_BLOCK_LEN; 217 } 218 if (nbytes) { 219 aes_encryption(in_buf, out_buf, key); 220 memcpy(dst_buf,out_buf,nbytes); 221 } 222 } 223 224 /* The final UHASH result is XOR'd with the output of a pseudorandom 225 * function. Here, we use AES to generate random output and 226 * xor the appropriate bytes depending on the last bits of nonce. 227 * This scheme is optimized for sequential, increasing big-endian nonces. 228 */ 229 230 typedef struct { 231 UINT8 cache[AES_BLOCK_LEN]; /* Previous AES output is saved */ 232 UINT8 nonce[AES_BLOCK_LEN]; /* The AES input making above cache */ 233 aes_int_key prf_key; /* Expanded AES key for PDF */ 234 } pdf_ctx; 235 236 static void pdf_init(pdf_ctx *pc, aes_int_key prf_key) 237 { 238 UINT8 buf[UMAC_KEY_LEN]; 239 240 kdf(buf, prf_key, 0, UMAC_KEY_LEN); 241 aes_key_setup(buf, pc->prf_key); 242 243 /* Initialize pdf and cache */ 244 memset(pc->nonce, 0, sizeof(pc->nonce)); 245 aes_encryption(pc->nonce, pc->cache, pc->prf_key); 246 } 247 248 static void pdf_gen_xor(pdf_ctx *pc, UINT8 nonce[8], UINT8 buf[8]) 249 { 250 /* 'ndx' indicates that we'll be using the 0th or 1st eight bytes 251 * of the AES output. If last time around we returned the ndx-1st 252 * element, then we may have the result in the cache already. 253 */ 254 255 #if (UMAC_OUTPUT_LEN == 4) 256 #define LOW_BIT_MASK 3 257 #elif (UMAC_OUTPUT_LEN == 8) 258 #define LOW_BIT_MASK 1 259 #elif (UMAC_OUTPUT_LEN > 8) 260 #define LOW_BIT_MASK 0 261 #endif 262 263 UINT8 tmp_nonce_lo[4]; 264 #if LOW_BIT_MASK != 0 265 int ndx = nonce[7] & LOW_BIT_MASK; 266 #endif 267 *(UINT32 *)tmp_nonce_lo = ((UINT32 *)nonce)[1]; 268 tmp_nonce_lo[3] &= ~LOW_BIT_MASK; /* zero last bit */ 269 270 if ( (((UINT32 *)tmp_nonce_lo)[0] != ((UINT32 *)pc->nonce)[1]) || 271 (((UINT32 *)nonce)[0] != ((UINT32 *)pc->nonce)[0]) ) 272 { 273 ((UINT32 *)pc->nonce)[0] = ((UINT32 *)nonce)[0]; 274 ((UINT32 *)pc->nonce)[1] = ((UINT32 *)tmp_nonce_lo)[0]; 275 aes_encryption(pc->nonce, pc->cache, pc->prf_key); 276 } 277 278 #if (UMAC_OUTPUT_LEN == 4) 279 *((UINT32 *)buf) ^= ((UINT32 *)pc->cache)[ndx]; 280 #elif (UMAC_OUTPUT_LEN == 8) 281 *((UINT64 *)buf) ^= ((UINT64 *)pc->cache)[ndx]; 282 #elif (UMAC_OUTPUT_LEN == 12) 283 ((UINT64 *)buf)[0] ^= ((UINT64 *)pc->cache)[0]; 284 ((UINT32 *)buf)[2] ^= ((UINT32 *)pc->cache)[2]; 285 #elif (UMAC_OUTPUT_LEN == 16) 286 ((UINT64 *)buf)[0] ^= ((UINT64 *)pc->cache)[0]; 287 ((UINT64 *)buf)[1] ^= ((UINT64 *)pc->cache)[1]; 288 #endif 289 } 290 291 /* ---------------------------------------------------------------------- */ 292 /* ---------------------------------------------------------------------- */ 293 /* ----- Begin NH Hash Section ------------------------------------------ */ 294 /* ---------------------------------------------------------------------- */ 295 /* ---------------------------------------------------------------------- */ 296 297 /* The NH-based hash functions used in UMAC are described in the UMAC paper 298 * and specification, both of which can be found at the UMAC website. 299 * The interface to this implementation has two 300 * versions, one expects the entire message being hashed to be passed 301 * in a single buffer and returns the hash result immediately. The second 302 * allows the message to be passed in a sequence of buffers. In the 303 * muliple-buffer interface, the client calls the routine nh_update() as 304 * many times as necessary. When there is no more data to be fed to the 305 * hash, the client calls nh_final() which calculates the hash output. 306 * Before beginning another hash calculation the nh_reset() routine 307 * must be called. The single-buffer routine, nh(), is equivalent to 308 * the sequence of calls nh_update() and nh_final(); however it is 309 * optimized and should be prefered whenever the multiple-buffer interface 310 * is not necessary. When using either interface, it is the client's 311 * responsability to pass no more than L1_KEY_LEN bytes per hash result. 312 * 313 * The routine nh_init() initializes the nh_ctx data structure and 314 * must be called once, before any other PDF routine. 315 */ 316 317 /* The "nh_aux" routines do the actual NH hashing work. They 318 * expect buffers to be multiples of L1_PAD_BOUNDARY. These routines 319 * produce output for all STREAMS NH iterations in one call, 320 * allowing the parallel implementation of the streams. 321 */ 322 323 #define STREAMS (UMAC_OUTPUT_LEN / 4) /* Number of times hash is applied */ 324 #define L1_KEY_LEN 1024 /* Internal key bytes */ 325 #define L1_KEY_SHIFT 16 /* Toeplitz key shift between streams */ 326 #define L1_PAD_BOUNDARY 32 /* pad message to boundary multiple */ 327 #define ALLOC_BOUNDARY 16 /* Keep buffers aligned to this */ 328 #define HASH_BUF_BYTES 64 /* nh_aux_hb buffer multiple */ 329 330 typedef struct { 331 UINT8 nh_key [L1_KEY_LEN + L1_KEY_SHIFT * (STREAMS - 1)]; /* NH Key */ 332 UINT8 data [HASH_BUF_BYTES]; /* Incomming data buffer */ 333 int next_data_empty; /* Bookeeping variable for data buffer. */ 334 int bytes_hashed; /* Bytes (out of L1_KEY_LEN) incorperated. */ 335 UINT64 state[STREAMS]; /* on-line state */ 336 } nh_ctx; 337 338 339 #if (UMAC_OUTPUT_LEN == 4) 340 341 static void nh_aux(void *kp, void *dp, void *hp, UINT32 dlen) 342 /* NH hashing primitive. Previous (partial) hash result is loaded and 343 * then stored via hp pointer. The length of the data pointed at by "dp", 344 * "dlen", is guaranteed to be divisible by L1_PAD_BOUNDARY (32). Key 345 * is expected to be endian compensated in memory at key setup. 346 */ 347 { 348 UINT64 h; 349 UWORD c = dlen / 32; 350 UINT32 *k = (UINT32 *)kp; 351 UINT32 *d = (UINT32 *)dp; 352 UINT32 d0,d1,d2,d3,d4,d5,d6,d7; 353 UINT32 k0,k1,k2,k3,k4,k5,k6,k7; 354 355 h = *((UINT64 *)hp); 356 do { 357 d0 = LOAD_UINT32_LITTLE(d+0); d1 = LOAD_UINT32_LITTLE(d+1); 358 d2 = LOAD_UINT32_LITTLE(d+2); d3 = LOAD_UINT32_LITTLE(d+3); 359 d4 = LOAD_UINT32_LITTLE(d+4); d5 = LOAD_UINT32_LITTLE(d+5); 360 d6 = LOAD_UINT32_LITTLE(d+6); d7 = LOAD_UINT32_LITTLE(d+7); 361 k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3); 362 k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7); 363 h += MUL64((k0 + d0), (k4 + d4)); 364 h += MUL64((k1 + d1), (k5 + d5)); 365 h += MUL64((k2 + d2), (k6 + d6)); 366 h += MUL64((k3 + d3), (k7 + d7)); 367 368 d += 8; 369 k += 8; 370 } while (--c); 371 *((UINT64 *)hp) = h; 372 } 373 374 #elif (UMAC_OUTPUT_LEN == 8) 375 376 static void nh_aux(void *kp, void *dp, void *hp, UINT32 dlen) 377 /* Same as previous nh_aux, but two streams are handled in one pass, 378 * reading and writing 16 bytes of hash-state per call. 379 */ 380 { 381 UINT64 h1,h2; 382 UWORD c = dlen / 32; 383 UINT32 *k = (UINT32 *)kp; 384 UINT32 *d = (UINT32 *)dp; 385 UINT32 d0,d1,d2,d3,d4,d5,d6,d7; 386 UINT32 k0,k1,k2,k3,k4,k5,k6,k7, 387 k8,k9,k10,k11; 388 389 h1 = *((UINT64 *)hp); 390 h2 = *((UINT64 *)hp + 1); 391 k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3); 392 do { 393 d0 = LOAD_UINT32_LITTLE(d+0); d1 = LOAD_UINT32_LITTLE(d+1); 394 d2 = LOAD_UINT32_LITTLE(d+2); d3 = LOAD_UINT32_LITTLE(d+3); 395 d4 = LOAD_UINT32_LITTLE(d+4); d5 = LOAD_UINT32_LITTLE(d+5); 396 d6 = LOAD_UINT32_LITTLE(d+6); d7 = LOAD_UINT32_LITTLE(d+7); 397 k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7); 398 k8 = *(k+8); k9 = *(k+9); k10 = *(k+10); k11 = *(k+11); 399 400 h1 += MUL64((k0 + d0), (k4 + d4)); 401 h2 += MUL64((k4 + d0), (k8 + d4)); 402 403 h1 += MUL64((k1 + d1), (k5 + d5)); 404 h2 += MUL64((k5 + d1), (k9 + d5)); 405 406 h1 += MUL64((k2 + d2), (k6 + d6)); 407 h2 += MUL64((k6 + d2), (k10 + d6)); 408 409 h1 += MUL64((k3 + d3), (k7 + d7)); 410 h2 += MUL64((k7 + d3), (k11 + d7)); 411 412 k0 = k8; k1 = k9; k2 = k10; k3 = k11; 413 414 d += 8; 415 k += 8; 416 } while (--c); 417 ((UINT64 *)hp)[0] = h1; 418 ((UINT64 *)hp)[1] = h2; 419 } 420 421 #elif (UMAC_OUTPUT_LEN == 12) 422 423 static void nh_aux(void *kp, void *dp, void *hp, UINT32 dlen) 424 /* Same as previous nh_aux, but two streams are handled in one pass, 425 * reading and writing 24 bytes of hash-state per call. 426 */ 427 { 428 UINT64 h1,h2,h3; 429 UWORD c = dlen / 32; 430 UINT32 *k = (UINT32 *)kp; 431 UINT32 *d = (UINT32 *)dp; 432 UINT32 d0,d1,d2,d3,d4,d5,d6,d7; 433 UINT32 k0,k1,k2,k3,k4,k5,k6,k7, 434 k8,k9,k10,k11,k12,k13,k14,k15; 435 436 h1 = *((UINT64 *)hp); 437 h2 = *((UINT64 *)hp + 1); 438 h3 = *((UINT64 *)hp + 2); 439 k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3); 440 k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7); 441 do { 442 d0 = LOAD_UINT32_LITTLE(d+0); d1 = LOAD_UINT32_LITTLE(d+1); 443 d2 = LOAD_UINT32_LITTLE(d+2); d3 = LOAD_UINT32_LITTLE(d+3); 444 d4 = LOAD_UINT32_LITTLE(d+4); d5 = LOAD_UINT32_LITTLE(d+5); 445 d6 = LOAD_UINT32_LITTLE(d+6); d7 = LOAD_UINT32_LITTLE(d+7); 446 k8 = *(k+8); k9 = *(k+9); k10 = *(k+10); k11 = *(k+11); 447 k12 = *(k+12); k13 = *(k+13); k14 = *(k+14); k15 = *(k+15); 448 449 h1 += MUL64((k0 + d0), (k4 + d4)); 450 h2 += MUL64((k4 + d0), (k8 + d4)); 451 h3 += MUL64((k8 + d0), (k12 + d4)); 452 453 h1 += MUL64((k1 + d1), (k5 + d5)); 454 h2 += MUL64((k5 + d1), (k9 + d5)); 455 h3 += MUL64((k9 + d1), (k13 + d5)); 456 457 h1 += MUL64((k2 + d2), (k6 + d6)); 458 h2 += MUL64((k6 + d2), (k10 + d6)); 459 h3 += MUL64((k10 + d2), (k14 + d6)); 460 461 h1 += MUL64((k3 + d3), (k7 + d7)); 462 h2 += MUL64((k7 + d3), (k11 + d7)); 463 h3 += MUL64((k11 + d3), (k15 + d7)); 464 465 k0 = k8; k1 = k9; k2 = k10; k3 = k11; 466 k4 = k12; k5 = k13; k6 = k14; k7 = k15; 467 468 d += 8; 469 k += 8; 470 } while (--c); 471 ((UINT64 *)hp)[0] = h1; 472 ((UINT64 *)hp)[1] = h2; 473 ((UINT64 *)hp)[2] = h3; 474 } 475 476 #elif (UMAC_OUTPUT_LEN == 16) 477 478 static void nh_aux(void *kp, void *dp, void *hp, UINT32 dlen) 479 /* Same as previous nh_aux, but two streams are handled in one pass, 480 * reading and writing 24 bytes of hash-state per call. 481 */ 482 { 483 UINT64 h1,h2,h3,h4; 484 UWORD c = dlen / 32; 485 UINT32 *k = (UINT32 *)kp; 486 UINT32 *d = (UINT32 *)dp; 487 UINT32 d0,d1,d2,d3,d4,d5,d6,d7; 488 UINT32 k0,k1,k2,k3,k4,k5,k6,k7, 489 k8,k9,k10,k11,k12,k13,k14,k15, 490 k16,k17,k18,k19; 491 492 h1 = *((UINT64 *)hp); 493 h2 = *((UINT64 *)hp + 1); 494 h3 = *((UINT64 *)hp + 2); 495 h4 = *((UINT64 *)hp + 3); 496 k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3); 497 k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7); 498 do { 499 d0 = LOAD_UINT32_LITTLE(d+0); d1 = LOAD_UINT32_LITTLE(d+1); 500 d2 = LOAD_UINT32_LITTLE(d+2); d3 = LOAD_UINT32_LITTLE(d+3); 501 d4 = LOAD_UINT32_LITTLE(d+4); d5 = LOAD_UINT32_LITTLE(d+5); 502 d6 = LOAD_UINT32_LITTLE(d+6); d7 = LOAD_UINT32_LITTLE(d+7); 503 k8 = *(k+8); k9 = *(k+9); k10 = *(k+10); k11 = *(k+11); 504 k12 = *(k+12); k13 = *(k+13); k14 = *(k+14); k15 = *(k+15); 505 k16 = *(k+16); k17 = *(k+17); k18 = *(k+18); k19 = *(k+19); 506 507 h1 += MUL64((k0 + d0), (k4 + d4)); 508 h2 += MUL64((k4 + d0), (k8 + d4)); 509 h3 += MUL64((k8 + d0), (k12 + d4)); 510 h4 += MUL64((k12 + d0), (k16 + d4)); 511 512 h1 += MUL64((k1 + d1), (k5 + d5)); 513 h2 += MUL64((k5 + d1), (k9 + d5)); 514 h3 += MUL64((k9 + d1), (k13 + d5)); 515 h4 += MUL64((k13 + d1), (k17 + d5)); 516 517 h1 += MUL64((k2 + d2), (k6 + d6)); 518 h2 += MUL64((k6 + d2), (k10 + d6)); 519 h3 += MUL64((k10 + d2), (k14 + d6)); 520 h4 += MUL64((k14 + d2), (k18 + d6)); 521 522 h1 += MUL64((k3 + d3), (k7 + d7)); 523 h2 += MUL64((k7 + d3), (k11 + d7)); 524 h3 += MUL64((k11 + d3), (k15 + d7)); 525 h4 += MUL64((k15 + d3), (k19 + d7)); 526 527 k0 = k8; k1 = k9; k2 = k10; k3 = k11; 528 k4 = k12; k5 = k13; k6 = k14; k7 = k15; 529 k8 = k16; k9 = k17; k10 = k18; k11 = k19; 530 531 d += 8; 532 k += 8; 533 } while (--c); 534 ((UINT64 *)hp)[0] = h1; 535 ((UINT64 *)hp)[1] = h2; 536 ((UINT64 *)hp)[2] = h3; 537 ((UINT64 *)hp)[3] = h4; 538 } 539 540 /* ---------------------------------------------------------------------- */ 541 #endif /* UMAC_OUTPUT_LENGTH */ 542 /* ---------------------------------------------------------------------- */ 543 544 545 /* ---------------------------------------------------------------------- */ 546 547 static void nh_transform(nh_ctx *hc, UINT8 *buf, UINT32 nbytes) 548 /* This function is a wrapper for the primitive NH hash functions. It takes 549 * as argument "hc" the current hash context and a buffer which must be a 550 * multiple of L1_PAD_BOUNDARY. The key passed to nh_aux is offset 551 * appropriately according to how much message has been hashed already. 552 */ 553 { 554 UINT8 *key; 555 556 key = hc->nh_key + hc->bytes_hashed; 557 nh_aux(key, buf, hc->state, nbytes); 558 } 559 560 /* ---------------------------------------------------------------------- */ 561 562 #if (__LITTLE_ENDIAN__) 563 #define endian_convert_if_le(x,y,z) endian_convert((x),(y),(z)) 564 static void endian_convert(void *buf, UWORD bpw, UINT32 num_bytes) 565 /* We endian convert the keys on little-endian computers to */ 566 /* compensate for the lack of big-endian memory reads during hashing. */ 567 { 568 UWORD iters = num_bytes / bpw; 569 if (bpw == 4) { 570 UINT32 *p = (UINT32 *)buf; 571 do { 572 *p = LOAD_UINT32_REVERSED(p); 573 p++; 574 } while (--iters); 575 } else if (bpw == 8) { 576 UINT32 *p = (UINT32 *)buf; 577 UINT32 t; 578 do { 579 t = LOAD_UINT32_REVERSED(p+1); 580 p[1] = LOAD_UINT32_REVERSED(p); 581 p[0] = t; 582 p += 2; 583 } while (--iters); 584 } 585 } 586 #if (__LITTLE_ENDIAN__) 587 #define endian_convert_if_le(x,y,z) endian_convert((x),(y),(z)) 588 #else 589 #define endian_convert_if_le(x,y,z) do{}while(0) /* Do nothing */ 590 #endif 591 592 /* ---------------------------------------------------------------------- */ 593 594 static void nh_reset(nh_ctx *hc) 595 /* Reset nh_ctx to ready for hashing of new data */ 596 { 597 hc->bytes_hashed = 0; 598 hc->next_data_empty = 0; 599 hc->state[0] = 0; 600 #if (UMAC_OUTPUT_LEN >= 8) 601 hc->state[1] = 0; 602 #endif 603 #if (UMAC_OUTPUT_LEN >= 12) 604 hc->state[2] = 0; 605 #endif 606 #if (UMAC_OUTPUT_LEN == 16) 607 hc->state[3] = 0; 608 #endif 609 610 } 611 612 /* ---------------------------------------------------------------------- */ 613 614 static void nh_init(nh_ctx *hc, aes_int_key prf_key) 615 /* Generate nh_key, endian convert and reset to be ready for hashing. */ 616 { 617 kdf(hc->nh_key, prf_key, 1, sizeof(hc->nh_key)); 618 endian_convert_if_le(hc->nh_key, 4, sizeof(hc->nh_key)); 619 nh_reset(hc); 620 } 621 622 /* ---------------------------------------------------------------------- */ 623 624 static void nh_update(nh_ctx *hc, UINT8 *buf, UINT32 nbytes) 625 /* Incorporate nbytes of data into a nh_ctx, buffer whatever is not an */ 626 /* even multiple of HASH_BUF_BYTES. */ 627 { 628 UINT32 i,j; 629 630 j = hc->next_data_empty; 631 if ((j + nbytes) >= HASH_BUF_BYTES) { 632 if (j) { 633 i = HASH_BUF_BYTES - j; 634 memcpy(hc->data+j, buf, i); 635 nh_transform(hc,hc->data,HASH_BUF_BYTES); 636 nbytes -= i; 637 buf += i; 638 hc->bytes_hashed += HASH_BUF_BYTES; 639 } 640 if (nbytes >= HASH_BUF_BYTES) { 641 i = nbytes & ~(HASH_BUF_BYTES - 1); 642 nh_transform(hc, buf, i); 643 nbytes -= i; 644 buf += i; 645 hc->bytes_hashed += i; 646 } 647 j = 0; 648 } 649 memcpy(hc->data + j, buf, nbytes); 650 hc->next_data_empty = j + nbytes; 651 } 652 653 /* ---------------------------------------------------------------------- */ 654 655 static void zero_pad(UINT8 *p, int nbytes) 656 { 657 /* Write "nbytes" of zeroes, beginning at "p" */ 658 if (nbytes >= (int)sizeof(UWORD)) { 659 while ((ptrdiff_t)p % sizeof(UWORD)) { 660 *p = 0; 661 nbytes--; 662 p++; 663 } 664 while (nbytes >= (int)sizeof(UWORD)) { 665 *(UWORD *)p = 0; 666 nbytes -= sizeof(UWORD); 667 p += sizeof(UWORD); 668 } 669 } 670 while (nbytes) { 671 *p = 0; 672 nbytes--; 673 p++; 674 } 675 } 676 677 /* ---------------------------------------------------------------------- */ 678 679 static void nh_final(nh_ctx *hc, UINT8 *result) 680 /* After passing some number of data buffers to nh_update() for integration 681 * into an NH context, nh_final is called to produce a hash result. If any 682 * bytes are in the buffer hc->data, incorporate them into the 683 * NH context. Finally, add into the NH accumulation "state" the total number 684 * of bits hashed. The resulting numbers are written to the buffer "result". 685 * If nh_update was never called, L1_PAD_BOUNDARY zeroes are incorporated. 686 */ 687 { 688 int nh_len, nbits; 689 690 if (hc->next_data_empty != 0) { 691 nh_len = ((hc->next_data_empty + (L1_PAD_BOUNDARY - 1)) & 692 ~(L1_PAD_BOUNDARY - 1)); 693 zero_pad(hc->data + hc->next_data_empty, 694 nh_len - hc->next_data_empty); 695 nh_transform(hc, hc->data, nh_len); 696 hc->bytes_hashed += hc->next_data_empty; 697 } else if (hc->bytes_hashed == 0) { 698 nh_len = L1_PAD_BOUNDARY; 699 zero_pad(hc->data, L1_PAD_BOUNDARY); 700 nh_transform(hc, hc->data, nh_len); 701 } 702 703 nbits = (hc->bytes_hashed << 3); 704 ((UINT64 *)result)[0] = ((UINT64 *)hc->state)[0] + nbits; 705 #if (UMAC_OUTPUT_LEN >= 8) 706 ((UINT64 *)result)[1] = ((UINT64 *)hc->state)[1] + nbits; 707 #endif 708 #if (UMAC_OUTPUT_LEN >= 12) 709 ((UINT64 *)result)[2] = ((UINT64 *)hc->state)[2] + nbits; 710 #endif 711 #if (UMAC_OUTPUT_LEN == 16) 712 ((UINT64 *)result)[3] = ((UINT64 *)hc->state)[3] + nbits; 713 #endif 714 nh_reset(hc); 715 } 716 717 /* ---------------------------------------------------------------------- */ 718 719 static void nh(nh_ctx *hc, UINT8 *buf, UINT32 padded_len, 720 UINT32 unpadded_len, UINT8 *result) 721 /* All-in-one nh_update() and nh_final() equivalent. 722 * Assumes that padded_len is divisible by L1_PAD_BOUNDARY and result is 723 * well aligned 724 */ 725 { 726 UINT32 nbits; 727 728 /* Initialize the hash state */ 729 nbits = (unpadded_len << 3); 730 731 ((UINT64 *)result)[0] = nbits; 732 #if (UMAC_OUTPUT_LEN >= 8) 733 ((UINT64 *)result)[1] = nbits; 734 #endif 735 #if (UMAC_OUTPUT_LEN >= 12) 736 ((UINT64 *)result)[2] = nbits; 737 #endif 738 #if (UMAC_OUTPUT_LEN == 16) 739 ((UINT64 *)result)[3] = nbits; 740 #endif 741 742 nh_aux(hc->nh_key, buf, result, padded_len); 743 } 744 745 /* ---------------------------------------------------------------------- */ 746 /* ---------------------------------------------------------------------- */ 747 /* ----- Begin UHASH Section -------------------------------------------- */ 748 /* ---------------------------------------------------------------------- */ 749 /* ---------------------------------------------------------------------- */ 750 751 /* UHASH is a multi-layered algorithm. Data presented to UHASH is first 752 * hashed by NH. The NH output is then hashed by a polynomial-hash layer 753 * unless the initial data to be hashed is short. After the polynomial- 754 * layer, an inner-product hash is used to produce the final UHASH output. 755 * 756 * UHASH provides two interfaces, one all-at-once and another where data 757 * buffers are presented sequentially. In the sequential interface, the 758 * UHASH client calls the routine uhash_update() as many times as necessary. 759 * When there is no more data to be fed to UHASH, the client calls 760 * uhash_final() which 761 * calculates the UHASH output. Before beginning another UHASH calculation 762 * the uhash_reset() routine must be called. The all-at-once UHASH routine, 763 * uhash(), is equivalent to the sequence of calls uhash_update() and 764 * uhash_final(); however it is optimized and should be 765 * used whenever the sequential interface is not necessary. 766 * 767 * The routine uhash_init() initializes the uhash_ctx data structure and 768 * must be called once, before any other UHASH routine. 769 */ 770 771 /* ---------------------------------------------------------------------- */ 772 /* ----- Constants and uhash_ctx ---------------------------------------- */ 773 /* ---------------------------------------------------------------------- */ 774 775 /* ---------------------------------------------------------------------- */ 776 /* ----- Poly hash and Inner-Product hash Constants --------------------- */ 777 /* ---------------------------------------------------------------------- */ 778 779 /* Primes and masks */ 780 #define p36 ((UINT64)0x0000000FFFFFFFFBull) /* 2^36 - 5 */ 781 #define p64 ((UINT64)0xFFFFFFFFFFFFFFC5ull) /* 2^64 - 59 */ 782 #define m36 ((UINT64)0x0000000FFFFFFFFFull) /* The low 36 of 64 bits */ 783 784 785 /* ---------------------------------------------------------------------- */ 786 787 typedef struct uhash_ctx { 788 nh_ctx hash; /* Hash context for L1 NH hash */ 789 UINT64 poly_key_8[STREAMS]; /* p64 poly keys */ 790 UINT64 poly_accum[STREAMS]; /* poly hash result */ 791 UINT64 ip_keys[STREAMS*4]; /* Inner-product keys */ 792 UINT32 ip_trans[STREAMS]; /* Inner-product translation */ 793 UINT32 msg_len; /* Total length of data passed */ 794 /* to uhash */ 795 } uhash_ctx; 796 typedef struct uhash_ctx *uhash_ctx_t; 797 798 /* ---------------------------------------------------------------------- */ 799 800 801 /* The polynomial hashes use Horner's rule to evaluate a polynomial one 802 * word at a time. As described in the specification, poly32 and poly64 803 * require keys from special domains. The following implementations exploit 804 * the special domains to avoid overflow. The results are not guaranteed to 805 * be within Z_p32 and Z_p64, but the Inner-Product hash implementation 806 * patches any errant values. 807 */ 808 809 static UINT64 poly64(UINT64 cur, UINT64 key, UINT64 data) 810 { 811 UINT32 key_hi = (UINT32)(key >> 32), 812 key_lo = (UINT32)key, 813 cur_hi = (UINT32)(cur >> 32), 814 cur_lo = (UINT32)cur, 815 x_lo, 816 x_hi; 817 UINT64 X,T,res; 818 819 X = MUL64(key_hi, cur_lo) + MUL64(cur_hi, key_lo); 820 x_lo = (UINT32)X; 821 x_hi = (UINT32)(X >> 32); 822 823 res = (MUL64(key_hi, cur_hi) + x_hi) * 59 + MUL64(key_lo, cur_lo); 824 825 T = ((UINT64)x_lo << 32); 826 res += T; 827 if (res < T) 828 res += 59; 829 830 res += data; 831 if (res < data) 832 res += 59; 833 834 return res; 835 } 836 837 838 /* Although UMAC is specified to use a ramped polynomial hash scheme, this 839 * implementation does not handle all ramp levels. Because we don't handle 840 * the ramp up to p128 modulus in this implementation, we are limited to 841 * 2^14 poly_hash() invocations per stream (for a total capacity of 2^24 842 * bytes input to UMAC per tag, ie. 16MB). 843 */ 844 static void poly_hash(uhash_ctx_t hc, UINT32 data_in[]) 845 { 846 int i; 847 UINT64 *data=(UINT64*)data_in; 848 849 for (i = 0; i < STREAMS; i++) { 850 if ((UINT32)(data[i] >> 32) == 0xfffffffful) { 851 hc->poly_accum[i] = poly64(hc->poly_accum[i], 852 hc->poly_key_8[i], p64 - 1); 853 hc->poly_accum[i] = poly64(hc->poly_accum[i], 854 hc->poly_key_8[i], (data[i] - 59)); 855 } else { 856 hc->poly_accum[i] = poly64(hc->poly_accum[i], 857 hc->poly_key_8[i], data[i]); 858 } 859 } 860 } 861 862 863 /* ---------------------------------------------------------------------- */ 864 865 866 /* The final step in UHASH is an inner-product hash. The poly hash 867 * produces a result not neccesarily WORD_LEN bytes long. The inner- 868 * product hash breaks the polyhash output into 16-bit chunks and 869 * multiplies each with a 36 bit key. 870 */ 871 872 static UINT64 ip_aux(UINT64 t, UINT64 *ipkp, UINT64 data) 873 { 874 t = t + ipkp[0] * (UINT64)(UINT16)(data >> 48); 875 t = t + ipkp[1] * (UINT64)(UINT16)(data >> 32); 876 t = t + ipkp[2] * (UINT64)(UINT16)(data >> 16); 877 t = t + ipkp[3] * (UINT64)(UINT16)(data); 878 879 return t; 880 } 881 882 static UINT32 ip_reduce_p36(UINT64 t) 883 { 884 /* Divisionless modular reduction */ 885 UINT64 ret; 886 887 ret = (t & m36) + 5 * (t >> 36); 888 if (ret >= p36) 889 ret -= p36; 890 891 /* return least significant 32 bits */ 892 return (UINT32)(ret); 893 } 894 895 896 /* If the data being hashed by UHASH is no longer than L1_KEY_LEN, then 897 * the polyhash stage is skipped and ip_short is applied directly to the 898 * NH output. 899 */ 900 static void ip_short(uhash_ctx_t ahc, UINT8 *nh_res, u_char *res) 901 { 902 UINT64 t; 903 UINT64 *nhp = (UINT64 *)nh_res; 904 905 t = ip_aux(0,ahc->ip_keys, nhp[0]); 906 STORE_UINT32_BIG((UINT32 *)res+0, ip_reduce_p36(t) ^ ahc->ip_trans[0]); 907 #if (UMAC_OUTPUT_LEN >= 8) 908 t = ip_aux(0,ahc->ip_keys+4, nhp[1]); 909 STORE_UINT32_BIG((UINT32 *)res+1, ip_reduce_p36(t) ^ ahc->ip_trans[1]); 910 #endif 911 #if (UMAC_OUTPUT_LEN >= 12) 912 t = ip_aux(0,ahc->ip_keys+8, nhp[2]); 913 STORE_UINT32_BIG((UINT32 *)res+2, ip_reduce_p36(t) ^ ahc->ip_trans[2]); 914 #endif 915 #if (UMAC_OUTPUT_LEN == 16) 916 t = ip_aux(0,ahc->ip_keys+12, nhp[3]); 917 STORE_UINT32_BIG((UINT32 *)res+3, ip_reduce_p36(t) ^ ahc->ip_trans[3]); 918 #endif 919 } 920 921 /* If the data being hashed by UHASH is longer than L1_KEY_LEN, then 922 * the polyhash stage is not skipped and ip_long is applied to the 923 * polyhash output. 924 */ 925 static void ip_long(uhash_ctx_t ahc, u_char *res) 926 { 927 int i; 928 UINT64 t; 929 930 for (i = 0; i < STREAMS; i++) { 931 /* fix polyhash output not in Z_p64 */ 932 if (ahc->poly_accum[i] >= p64) 933 ahc->poly_accum[i] -= p64; 934 t = ip_aux(0,ahc->ip_keys+(i*4), ahc->poly_accum[i]); 935 STORE_UINT32_BIG((UINT32 *)res+i, 936 ip_reduce_p36(t) ^ ahc->ip_trans[i]); 937 } 938 } 939 940 941 /* ---------------------------------------------------------------------- */ 942 943 /* ---------------------------------------------------------------------- */ 944 945 /* Reset uhash context for next hash session */ 946 static int uhash_reset(uhash_ctx_t pc) 947 { 948 nh_reset(&pc->hash); 949 pc->msg_len = 0; 950 pc->poly_accum[0] = 1; 951 #if (UMAC_OUTPUT_LEN >= 8) 952 pc->poly_accum[1] = 1; 953 #endif 954 #if (UMAC_OUTPUT_LEN >= 12) 955 pc->poly_accum[2] = 1; 956 #endif 957 #if (UMAC_OUTPUT_LEN == 16) 958 pc->poly_accum[3] = 1; 959 #endif 960 return 1; 961 } 962 963 /* ---------------------------------------------------------------------- */ 964 965 /* Given a pointer to the internal key needed by kdf() and a uhash context, 966 * initialize the NH context and generate keys needed for poly and inner- 967 * product hashing. All keys are endian adjusted in memory so that native 968 * loads cause correct keys to be in registers during calculation. 969 */ 970 static void uhash_init(uhash_ctx_t ahc, aes_int_key prf_key) 971 { 972 int i; 973 UINT8 buf[(8*STREAMS+4)*sizeof(UINT64)]; 974 975 /* Zero the entire uhash context */ 976 memset(ahc, 0, sizeof(uhash_ctx)); 977 978 /* Initialize the L1 hash */ 979 nh_init(&ahc->hash, prf_key); 980 981 /* Setup L2 hash variables */ 982 kdf(buf, prf_key, 2, sizeof(buf)); /* Fill buffer with index 1 key */ 983 for (i = 0; i < STREAMS; i++) { 984 /* Fill keys from the buffer, skipping bytes in the buffer not 985 * used by this implementation. Endian reverse the keys if on a 986 * little-endian computer. 987 */ 988 memcpy(ahc->poly_key_8+i, buf+24*i, 8); 989 endian_convert_if_le(ahc->poly_key_8+i, 8, 8); 990 /* Mask the 64-bit keys to their special domain */ 991 ahc->poly_key_8[i] &= ((UINT64)0x01ffffffu << 32) + 0x01ffffffu; 992 ahc->poly_accum[i] = 1; /* Our polyhash prepends a non-zero word */ 993 } 994 995 /* Setup L3-1 hash variables */ 996 kdf(buf, prf_key, 3, sizeof(buf)); /* Fill buffer with index 2 key */ 997 for (i = 0; i < STREAMS; i++) 998 memcpy(ahc->ip_keys+4*i, buf+(8*i+4)*sizeof(UINT64), 999 4*sizeof(UINT64)); 1000 endian_convert_if_le(ahc->ip_keys, sizeof(UINT64), 1001 sizeof(ahc->ip_keys)); 1002 for (i = 0; i < STREAMS*4; i++) 1003 ahc->ip_keys[i] %= p36; /* Bring into Z_p36 */ 1004 1005 /* Setup L3-2 hash variables */ 1006 /* Fill buffer with index 4 key */ 1007 kdf(ahc->ip_trans, prf_key, 4, STREAMS * sizeof(UINT32)); 1008 endian_convert_if_le(ahc->ip_trans, sizeof(UINT32), 1009 STREAMS * sizeof(UINT32)); 1010 } 1011 1012 /* ---------------------------------------------------------------------- */ 1013 1014 #if 0 1015 static uhash_ctx_t uhash_alloc(u_char key[]) 1016 { 1017 /* Allocate memory and force to a 16-byte boundary. */ 1018 uhash_ctx_t ctx; 1019 u_char bytes_to_add; 1020 aes_int_key prf_key; 1021 1022 ctx = (uhash_ctx_t)malloc(sizeof(uhash_ctx)+ALLOC_BOUNDARY); 1023 if (ctx) { 1024 if (ALLOC_BOUNDARY) { 1025 bytes_to_add = ALLOC_BOUNDARY - 1026 ((ptrdiff_t)ctx & (ALLOC_BOUNDARY -1)); 1027 ctx = (uhash_ctx_t)((u_char *)ctx + bytes_to_add); 1028 *((u_char *)ctx - 1) = bytes_to_add; 1029 } 1030 aes_key_setup(key,prf_key); 1031 uhash_init(ctx, prf_key); 1032 } 1033 return (ctx); 1034 } 1035 #endif 1036 1037 /* ---------------------------------------------------------------------- */ 1038 1039 #if 0 1040 static int uhash_free(uhash_ctx_t ctx) 1041 { 1042 /* Free memory allocated by uhash_alloc */ 1043 u_char bytes_to_sub; 1044 1045 if (ctx) { 1046 if (ALLOC_BOUNDARY) { 1047 bytes_to_sub = *((u_char *)ctx - 1); 1048 ctx = (uhash_ctx_t)((u_char *)ctx - bytes_to_sub); 1049 } 1050 free(ctx); 1051 } 1052 return (1); 1053 } 1054 #endif 1055 /* ---------------------------------------------------------------------- */ 1056 1057 static int uhash_update(uhash_ctx_t ctx, u_char *input, long len) 1058 /* Given len bytes of data, we parse it into L1_KEY_LEN chunks and 1059 * hash each one with NH, calling the polyhash on each NH output. 1060 */ 1061 { 1062 UWORD bytes_hashed, bytes_remaining; 1063 UINT64 result_buf[STREAMS]; 1064 UINT8 *nh_result = (UINT8 *)&result_buf; 1065 1066 if (ctx->msg_len + len <= L1_KEY_LEN) { 1067 nh_update(&ctx->hash, (UINT8 *)input, len); 1068 ctx->msg_len += len; 1069 } else { 1070 1071 bytes_hashed = ctx->msg_len % L1_KEY_LEN; 1072 if (ctx->msg_len == L1_KEY_LEN) 1073 bytes_hashed = L1_KEY_LEN; 1074 1075 if (bytes_hashed + len >= L1_KEY_LEN) { 1076 1077 /* If some bytes have been passed to the hash function */ 1078 /* then we want to pass at most (L1_KEY_LEN - bytes_hashed) */ 1079 /* bytes to complete the current nh_block. */ 1080 if (bytes_hashed) { 1081 bytes_remaining = (L1_KEY_LEN - bytes_hashed); 1082 nh_update(&ctx->hash, (UINT8 *)input, bytes_remaining); 1083 nh_final(&ctx->hash, nh_result); 1084 ctx->msg_len += bytes_remaining; 1085 poly_hash(ctx,(UINT32 *)nh_result); 1086 len -= bytes_remaining; 1087 input += bytes_remaining; 1088 } 1089 1090 /* Hash directly from input stream if enough bytes */ 1091 while (len >= L1_KEY_LEN) { 1092 nh(&ctx->hash, (UINT8 *)input, L1_KEY_LEN, 1093 L1_KEY_LEN, nh_result); 1094 ctx->msg_len += L1_KEY_LEN; 1095 len -= L1_KEY_LEN; 1096 input += L1_KEY_LEN; 1097 poly_hash(ctx,(UINT32 *)nh_result); 1098 } 1099 } 1100 1101 /* pass remaining < L1_KEY_LEN bytes of input data to NH */ 1102 if (len) { 1103 nh_update(&ctx->hash, (UINT8 *)input, len); 1104 ctx->msg_len += len; 1105 } 1106 } 1107 1108 return (1); 1109 } 1110 1111 /* ---------------------------------------------------------------------- */ 1112 1113 static int uhash_final(uhash_ctx_t ctx, u_char *res) 1114 /* Incorporate any pending data, pad, and generate tag */ 1115 { 1116 UINT64 result_buf[STREAMS]; 1117 UINT8 *nh_result = (UINT8 *)&result_buf; 1118 1119 if (ctx->msg_len > L1_KEY_LEN) { 1120 if (ctx->msg_len % L1_KEY_LEN) { 1121 nh_final(&ctx->hash, nh_result); 1122 poly_hash(ctx,(UINT32 *)nh_result); 1123 } 1124 ip_long(ctx, res); 1125 } else { 1126 nh_final(&ctx->hash, nh_result); 1127 ip_short(ctx,nh_result, res); 1128 } 1129 uhash_reset(ctx); 1130 return (1); 1131 } 1132 1133 /* ---------------------------------------------------------------------- */ 1134 1135 #if 0 1136 static int uhash(uhash_ctx_t ahc, u_char *msg, long len, u_char *res) 1137 /* assumes that msg is in a writable buffer of length divisible by */ 1138 /* L1_PAD_BOUNDARY. Bytes beyond msg[len] may be zeroed. */ 1139 { 1140 UINT8 nh_result[STREAMS*sizeof(UINT64)]; 1141 UINT32 nh_len; 1142 int extra_zeroes_needed; 1143 1144 /* If the message to be hashed is no longer than L1_HASH_LEN, we skip 1145 * the polyhash. 1146 */ 1147 if (len <= L1_KEY_LEN) { 1148 if (len == 0) /* If zero length messages will not */ 1149 nh_len = L1_PAD_BOUNDARY; /* be seen, comment out this case */ 1150 else 1151 nh_len = ((len + (L1_PAD_BOUNDARY - 1)) & ~(L1_PAD_BOUNDARY - 1)); 1152 extra_zeroes_needed = nh_len - len; 1153 zero_pad((UINT8 *)msg + len, extra_zeroes_needed); 1154 nh(&ahc->hash, (UINT8 *)msg, nh_len, len, nh_result); 1155 ip_short(ahc,nh_result, res); 1156 } else { 1157 /* Otherwise, we hash each L1_KEY_LEN chunk with NH, passing the NH 1158 * output to poly_hash(). 1159 */ 1160 do { 1161 nh(&ahc->hash, (UINT8 *)msg, L1_KEY_LEN, L1_KEY_LEN, nh_result); 1162 poly_hash(ahc,(UINT32 *)nh_result); 1163 len -= L1_KEY_LEN; 1164 msg += L1_KEY_LEN; 1165 } while (len >= L1_KEY_LEN); 1166 if (len) { 1167 nh_len = ((len + (L1_PAD_BOUNDARY - 1)) & ~(L1_PAD_BOUNDARY - 1)); 1168 extra_zeroes_needed = nh_len - len; 1169 zero_pad((UINT8 *)msg + len, extra_zeroes_needed); 1170 nh(&ahc->hash, (UINT8 *)msg, nh_len, len, nh_result); 1171 poly_hash(ahc,(UINT32 *)nh_result); 1172 } 1173 1174 ip_long(ahc, res); 1175 } 1176 1177 uhash_reset(ahc); 1178 return 1; 1179 } 1180 #endif 1181 1182 /* ---------------------------------------------------------------------- */ 1183 /* ---------------------------------------------------------------------- */ 1184 /* ----- Begin UMAC Section --------------------------------------------- */ 1185 /* ---------------------------------------------------------------------- */ 1186 /* ---------------------------------------------------------------------- */ 1187 1188 /* The UMAC interface has two interfaces, an all-at-once interface where 1189 * the entire message to be authenticated is passed to UMAC in one buffer, 1190 * and a sequential interface where the message is presented a little at a 1191 * time. The all-at-once is more optimaized than the sequential version and 1192 * should be preferred when the sequential interface is not required. 1193 */ 1194 struct umac_ctx { 1195 uhash_ctx hash; /* Hash function for message compression */ 1196 pdf_ctx pdf; /* PDF for hashed output */ 1197 void *free_ptr; /* Address to free this struct via */ 1198 } umac_ctx; 1199 1200 /* ---------------------------------------------------------------------- */ 1201 1202 #if 0 1203 int umac_reset(struct umac_ctx *ctx) 1204 /* Reset the hash function to begin a new authentication. */ 1205 { 1206 uhash_reset(&ctx->hash); 1207 return (1); 1208 } 1209 #endif 1210 1211 /* ---------------------------------------------------------------------- */ 1212 1213 int umac_delete(struct umac_ctx *ctx) 1214 /* Deallocate the ctx structure */ 1215 { 1216 if (ctx) { 1217 if (ALLOC_BOUNDARY) 1218 ctx = (struct umac_ctx *)ctx->free_ptr; 1219 xfree(ctx); 1220 } 1221 return (1); 1222 } 1223 1224 /* ---------------------------------------------------------------------- */ 1225 1226 struct umac_ctx *umac_new(u_char key[]) 1227 /* Dynamically allocate a umac_ctx struct, initialize variables, 1228 * generate subkeys from key. Align to 16-byte boundary. 1229 */ 1230 { 1231 struct umac_ctx *ctx, *octx; 1232 size_t bytes_to_add; 1233 aes_int_key prf_key; 1234 1235 octx = ctx = xmalloc(sizeof(*ctx) + ALLOC_BOUNDARY); 1236 if (ctx) { 1237 if (ALLOC_BOUNDARY) { 1238 bytes_to_add = ALLOC_BOUNDARY - 1239 ((ptrdiff_t)ctx & (ALLOC_BOUNDARY - 1)); 1240 ctx = (struct umac_ctx *)((u_char *)ctx + bytes_to_add); 1241 } 1242 ctx->free_ptr = octx; 1243 aes_key_setup(key,prf_key); 1244 pdf_init(&ctx->pdf, prf_key); 1245 uhash_init(&ctx->hash, prf_key); 1246 } 1247 1248 return (ctx); 1249 } 1250 1251 /* ---------------------------------------------------------------------- */ 1252 1253 int umac_final(struct umac_ctx *ctx, u_char tag[], u_char nonce[8]) 1254 /* Incorporate any pending data, pad, and generate tag */ 1255 { 1256 uhash_final(&ctx->hash, (u_char *)tag); 1257 pdf_gen_xor(&ctx->pdf, (UINT8 *)nonce, (UINT8 *)tag); 1258 1259 return (1); 1260 } 1261 1262 /* ---------------------------------------------------------------------- */ 1263 1264 int umac_update(struct umac_ctx *ctx, u_char *input, long len) 1265 /* Given len bytes of data, we parse it into L1_KEY_LEN chunks and */ 1266 /* hash each one, calling the PDF on the hashed output whenever the hash- */ 1267 /* output buffer is full. */ 1268 { 1269 uhash_update(&ctx->hash, input, len); 1270 return (1); 1271 } 1272 1273 /* ---------------------------------------------------------------------- */ 1274 1275 #if 0 1276 int umac(struct umac_ctx *ctx, u_char *input, 1277 long len, u_char tag[], 1278 u_char nonce[8]) 1279 /* All-in-one version simply calls umac_update() and umac_final(). */ 1280 { 1281 uhash(&ctx->hash, input, len, (u_char *)tag); 1282 pdf_gen_xor(&ctx->pdf, (UINT8 *)nonce, (UINT8 *)tag); 1283 1284 return (1); 1285 } 1286 #endif 1287 1288 /* ---------------------------------------------------------------------- */ 1289 /* ---------------------------------------------------------------------- */ 1290 /* ----- End UMAC Section ----------------------------------------------- */ 1291 /* ---------------------------------------------------------------------- */ 1292 /* ---------------------------------------------------------------------- */ 1293