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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 #include "mpi.h" | |
| 6 #include "mp_gf2m.h" | |
| 7 #include "ecl-priv.h" | |
| 8 #include "mpi-priv.h" | |
| 9 #include <stdlib.h> | |
| 10 | |
| 11 /* Allocate memory for a new GFMethod object. */ | |
| 12 GFMethod * | |
| 13 GFMethod_new() | |
| 14 { | |
| 15 mp_err res = MP_OKAY; | |
| 16 GFMethod *meth; | |
| 17 meth = (GFMethod *) malloc(sizeof(GFMethod)); | |
| 18 if (meth == NULL) | |
| 19 return NULL; | |
| 20 meth->constructed = MP_YES; | |
| 21 MP_DIGITS(&meth->irr) = 0; | |
| 22 meth->extra_free = NULL; | |
| 23 MP_CHECKOK(mp_init(&meth->irr)); | |
| 24 | |
| 25 CLEANUP: | |
| 26 if (res != MP_OKAY) { | |
| 27 GFMethod_free(meth); | |
| 28 return NULL; | |
| 29 } | |
| 30 return meth; | |
| 31 } | |
| 32 | |
| 33 /* Construct a generic GFMethod for arithmetic over prime fields with | |
| 34 * irreducible irr. */ | |
| 35 GFMethod * | |
| 36 GFMethod_consGFp(const mp_int *irr) | |
| 37 { | |
| 38 mp_err res = MP_OKAY; | |
| 39 GFMethod *meth = NULL; | |
| 40 | |
| 41 meth = GFMethod_new(); | |
| 42 if (meth == NULL) | |
| 43 return NULL; | |
| 44 | |
| 45 MP_CHECKOK(mp_copy(irr, &meth->irr)); | |
| 46 meth->irr_arr[0] = mpl_significant_bits(irr); | |
| 47 meth->irr_arr[1] = meth->irr_arr[2] = meth->irr_arr[3] = | |
| 48 meth->irr_arr[4] = 0; | |
| 49 switch(MP_USED(&meth->irr)) { | |
| 50 /* maybe we need 1 and 2 words here as well?*/ | |
| 51 case 3: | |
| 52 meth->field_add = &ec_GFp_add_3; | |
| 53 meth->field_sub = &ec_GFp_sub_3; | |
| 54 break; | |
| 55 case 4: | |
| 56 meth->field_add = &ec_GFp_add_4; | |
| 57 meth->field_sub = &ec_GFp_sub_4; | |
| 58 break; | |
| 59 case 5: | |
| 60 meth->field_add = &ec_GFp_add_5; | |
| 61 meth->field_sub = &ec_GFp_sub_5; | |
| 62 break; | |
| 63 case 6: | |
| 64 meth->field_add = &ec_GFp_add_6; | |
| 65 meth->field_sub = &ec_GFp_sub_6; | |
| 66 break; | |
| 67 default: | |
| 68 meth->field_add = &ec_GFp_add; | |
| 69 meth->field_sub = &ec_GFp_sub; | |
| 70 } | |
| 71 meth->field_neg = &ec_GFp_neg; | |
| 72 meth->field_mod = &ec_GFp_mod; | |
| 73 meth->field_mul = &ec_GFp_mul; | |
| 74 meth->field_sqr = &ec_GFp_sqr; | |
| 75 meth->field_div = &ec_GFp_div; | |
| 76 meth->field_enc = NULL; | |
| 77 meth->field_dec = NULL; | |
| 78 meth->extra1 = NULL; | |
| 79 meth->extra2 = NULL; | |
| 80 meth->extra_free = NULL; | |
| 81 | |
| 82 CLEANUP: | |
| 83 if (res != MP_OKAY) { | |
| 84 GFMethod_free(meth); | |
| 85 return NULL; | |
| 86 } | |
| 87 return meth; | |
| 88 } | |
| 89 | |
| 90 /* Construct a generic GFMethod for arithmetic over binary polynomial | |
| 91 * fields with irreducible irr that has array representation irr_arr (see | |
| 92 * ecl-priv.h for description of the representation). If irr_arr is NULL, | |
| 93 * then it is constructed from the bitstring representation. */ | |
| 94 GFMethod * | |
| 95 GFMethod_consGF2m(const mp_int *irr, const unsigned int irr_arr[5]) | |
| 96 { | |
| 97 mp_err res = MP_OKAY; | |
| 98 int ret; | |
| 99 GFMethod *meth = NULL; | |
| 100 | |
| 101 meth = GFMethod_new(); | |
| 102 if (meth == NULL) | |
| 103 return NULL; | |
| 104 | |
| 105 MP_CHECKOK(mp_copy(irr, &meth->irr)); | |
| 106 if (irr_arr != NULL) { | |
| 107 /* Irreducible polynomials are either trinomials or pentanomials
. */ | |
| 108 meth->irr_arr[0] = irr_arr[0]; | |
| 109 meth->irr_arr[1] = irr_arr[1]; | |
| 110 meth->irr_arr[2] = irr_arr[2]; | |
| 111 if (irr_arr[2] > 0) { | |
| 112 meth->irr_arr[3] = irr_arr[3]; | |
| 113 meth->irr_arr[4] = irr_arr[4]; | |
| 114 } else { | |
| 115 meth->irr_arr[3] = meth->irr_arr[4] = 0; | |
| 116 } | |
| 117 } else { | |
| 118 ret = mp_bpoly2arr(irr, meth->irr_arr, 5); | |
| 119 /* Irreducible polynomials are either trinomials or pentanomials
. */ | |
| 120 if ((ret != 5) && (ret != 3)) { | |
| 121 res = MP_UNDEF; | |
| 122 goto CLEANUP; | |
| 123 } | |
| 124 } | |
| 125 meth->field_add = &ec_GF2m_add; | |
| 126 meth->field_neg = &ec_GF2m_neg; | |
| 127 meth->field_sub = &ec_GF2m_add; | |
| 128 meth->field_mod = &ec_GF2m_mod; | |
| 129 meth->field_mul = &ec_GF2m_mul; | |
| 130 meth->field_sqr = &ec_GF2m_sqr; | |
| 131 meth->field_div = &ec_GF2m_div; | |
| 132 meth->field_enc = NULL; | |
| 133 meth->field_dec = NULL; | |
| 134 meth->extra1 = NULL; | |
| 135 meth->extra2 = NULL; | |
| 136 meth->extra_free = NULL; | |
| 137 | |
| 138 CLEANUP: | |
| 139 if (res != MP_OKAY) { | |
| 140 GFMethod_free(meth); | |
| 141 return NULL; | |
| 142 } | |
| 143 return meth; | |
| 144 } | |
| 145 | |
| 146 /* Free the memory allocated (if any) to a GFMethod object. */ | |
| 147 void | |
| 148 GFMethod_free(GFMethod *meth) | |
| 149 { | |
| 150 if (meth == NULL) | |
| 151 return; | |
| 152 if (meth->constructed == MP_NO) | |
| 153 return; | |
| 154 mp_clear(&meth->irr); | |
| 155 if (meth->extra_free != NULL) | |
| 156 meth->extra_free(meth); | |
| 157 free(meth); | |
| 158 } | |
| 159 | |
| 160 /* Wrapper functions for generic prime field arithmetic. */ | |
| 161 | |
| 162 /* Add two field elements. Assumes that 0 <= a, b < meth->irr */ | |
| 163 mp_err | |
| 164 ec_GFp_add(const mp_int *a, const mp_int *b, mp_int *r, | |
| 165 const GFMethod *meth) | |
| 166 { | |
| 167 /* PRE: 0 <= a, b < p = meth->irr POST: 0 <= r < p, r = a + b (mod p) */ | |
| 168 mp_err res; | |
| 169 | |
| 170 if ((res = mp_add(a, b, r)) != MP_OKAY) { | |
| 171 return res; | |
| 172 } | |
| 173 if (mp_cmp(r, &meth->irr) >= 0) { | |
| 174 return mp_sub(r, &meth->irr, r); | |
| 175 } | |
| 176 return res; | |
| 177 } | |
| 178 | |
| 179 /* Negates a field element. Assumes that 0 <= a < meth->irr */ | |
| 180 mp_err | |
| 181 ec_GFp_neg(const mp_int *a, mp_int *r, const GFMethod *meth) | |
| 182 { | |
| 183 /* PRE: 0 <= a < p = meth->irr POST: 0 <= r < p, r = -a (mod p) */ | |
| 184 | |
| 185 if (mp_cmp_z(a) == 0) { | |
| 186 mp_zero(r); | |
| 187 return MP_OKAY; | |
| 188 } | |
| 189 return mp_sub(&meth->irr, a, r); | |
| 190 } | |
| 191 | |
| 192 /* Subtracts two field elements. Assumes that 0 <= a, b < meth->irr */ | |
| 193 mp_err | |
| 194 ec_GFp_sub(const mp_int *a, const mp_int *b, mp_int *r, | |
| 195 const GFMethod *meth) | |
| 196 { | |
| 197 mp_err res = MP_OKAY; | |
| 198 | |
| 199 /* PRE: 0 <= a, b < p = meth->irr POST: 0 <= r < p, r = a - b (mod p) */ | |
| 200 res = mp_sub(a, b, r); | |
| 201 if (res == MP_RANGE) { | |
| 202 MP_CHECKOK(mp_sub(b, a, r)); | |
| 203 if (mp_cmp_z(r) < 0) { | |
| 204 MP_CHECKOK(mp_add(r, &meth->irr, r)); | |
| 205 } | |
| 206 MP_CHECKOK(ec_GFp_neg(r, r, meth)); | |
| 207 } | |
| 208 if (mp_cmp_z(r) < 0) { | |
| 209 MP_CHECKOK(mp_add(r, &meth->irr, r)); | |
| 210 } | |
| 211 CLEANUP: | |
| 212 return res; | |
| 213 } | |
| 214 /* | |
| 215 * Inline adds for small curve lengths. | |
| 216 */ | |
| 217 /* 3 words */ | |
| 218 mp_err | |
| 219 ec_GFp_add_3(const mp_int *a, const mp_int *b, mp_int *r, | |
| 220 const GFMethod *meth) | |
| 221 { | |
| 222 mp_err res = MP_OKAY; | |
| 223 mp_digit a0 = 0, a1 = 0, a2 = 0; | |
| 224 mp_digit r0 = 0, r1 = 0, r2 = 0; | |
| 225 mp_digit carry; | |
| 226 | |
| 227 switch(MP_USED(a)) { | |
| 228 case 3: | |
| 229 a2 = MP_DIGIT(a,2); | |
| 230 case 2: | |
| 231 a1 = MP_DIGIT(a,1); | |
| 232 case 1: | |
| 233 a0 = MP_DIGIT(a,0); | |
| 234 } | |
| 235 switch(MP_USED(b)) { | |
| 236 case 3: | |
| 237 r2 = MP_DIGIT(b,2); | |
| 238 case 2: | |
| 239 r1 = MP_DIGIT(b,1); | |
| 240 case 1: | |
| 241 r0 = MP_DIGIT(b,0); | |
| 242 } | |
| 243 | |
| 244 #ifndef MPI_AMD64_ADD | |
| 245 MP_ADD_CARRY(a0, r0, r0, 0, carry); | |
| 246 MP_ADD_CARRY(a1, r1, r1, carry, carry); | |
| 247 MP_ADD_CARRY(a2, r2, r2, carry, carry); | |
| 248 #else | |
| 249 __asm__ ( | |
| 250 "xorq %3,%3 \n\t" | |
| 251 "addq %4,%0 \n\t" | |
| 252 "adcq %5,%1 \n\t" | |
| 253 "adcq %6,%2 \n\t" | |
| 254 "adcq $0,%3 \n\t" | |
| 255 : "=r"(r0), "=r"(r1), "=r"(r2), "=r"(carry) | |
| 256 : "r" (a0), "r" (a1), "r" (a2), | |
| 257 "0" (r0), "1" (r1), "2" (r2) | |
| 258 : "%cc" ); | |
| 259 #endif | |
| 260 | |
| 261 MP_CHECKOK(s_mp_pad(r, 3)); | |
| 262 MP_DIGIT(r, 2) = r2; | |
| 263 MP_DIGIT(r, 1) = r1; | |
| 264 MP_DIGIT(r, 0) = r0; | |
| 265 MP_SIGN(r) = MP_ZPOS; | |
| 266 MP_USED(r) = 3; | |
| 267 | |
| 268 /* Do quick 'subract' if we've gone over | |
| 269 * (add the 2's complement of the curve field) */ | |
| 270 a2 = MP_DIGIT(&meth->irr,2); | |
| 271 if (carry || r2 > a2 || | |
| 272 ((r2 == a2) && mp_cmp(r,&meth->irr) != MP_LT)) { | |
| 273 a1 = MP_DIGIT(&meth->irr,1); | |
| 274 a0 = MP_DIGIT(&meth->irr,0); | |
| 275 #ifndef MPI_AMD64_ADD | |
| 276 MP_SUB_BORROW(r0, a0, r0, 0, carry); | |
| 277 MP_SUB_BORROW(r1, a1, r1, carry, carry); | |
| 278 MP_SUB_BORROW(r2, a2, r2, carry, carry); | |
| 279 #else | |
| 280 __asm__ ( | |
| 281 "subq %3,%0 \n\t" | |
| 282 "sbbq %4,%1 \n\t" | |
| 283 "sbbq %5,%2 \n\t" | |
| 284 : "=r"(r0), "=r"(r1), "=r"(r2) | |
| 285 : "r" (a0), "r" (a1), "r" (a2), | |
| 286 "0" (r0), "1" (r1), "2" (r2) | |
| 287 : "%cc" ); | |
| 288 #endif | |
| 289 MP_DIGIT(r, 2) = r2; | |
| 290 MP_DIGIT(r, 1) = r1; | |
| 291 MP_DIGIT(r, 0) = r0; | |
| 292 } | |
| 293 | |
| 294 s_mp_clamp(r); | |
| 295 | |
| 296 CLEANUP: | |
| 297 return res; | |
| 298 } | |
| 299 | |
| 300 /* 4 words */ | |
| 301 mp_err | |
| 302 ec_GFp_add_4(const mp_int *a, const mp_int *b, mp_int *r, | |
| 303 const GFMethod *meth) | |
| 304 { | |
| 305 mp_err res = MP_OKAY; | |
| 306 mp_digit a0 = 0, a1 = 0, a2 = 0, a3 = 0; | |
| 307 mp_digit r0 = 0, r1 = 0, r2 = 0, r3 = 0; | |
| 308 mp_digit carry; | |
| 309 | |
| 310 switch(MP_USED(a)) { | |
| 311 case 4: | |
| 312 a3 = MP_DIGIT(a,3); | |
| 313 case 3: | |
| 314 a2 = MP_DIGIT(a,2); | |
| 315 case 2: | |
| 316 a1 = MP_DIGIT(a,1); | |
| 317 case 1: | |
| 318 a0 = MP_DIGIT(a,0); | |
| 319 } | |
| 320 switch(MP_USED(b)) { | |
| 321 case 4: | |
| 322 r3 = MP_DIGIT(b,3); | |
| 323 case 3: | |
| 324 r2 = MP_DIGIT(b,2); | |
| 325 case 2: | |
| 326 r1 = MP_DIGIT(b,1); | |
| 327 case 1: | |
| 328 r0 = MP_DIGIT(b,0); | |
| 329 } | |
| 330 | |
| 331 #ifndef MPI_AMD64_ADD | |
| 332 MP_ADD_CARRY(a0, r0, r0, 0, carry); | |
| 333 MP_ADD_CARRY(a1, r1, r1, carry, carry); | |
| 334 MP_ADD_CARRY(a2, r2, r2, carry, carry); | |
| 335 MP_ADD_CARRY(a3, r3, r3, carry, carry); | |
| 336 #else | |
| 337 __asm__ ( | |
| 338 "xorq %4,%4 \n\t" | |
| 339 "addq %5,%0 \n\t" | |
| 340 "adcq %6,%1 \n\t" | |
| 341 "adcq %7,%2 \n\t" | |
| 342 "adcq %8,%3 \n\t" | |
| 343 "adcq $0,%4 \n\t" | |
| 344 : "=r"(r0), "=r"(r1), "=r"(r2), "=r"(r3), "=r"(carry) | |
| 345 : "r" (a0), "r" (a1), "r" (a2), "r" (a3), | |
| 346 "0" (r0), "1" (r1), "2" (r2), "3" (r3) | |
| 347 : "%cc" ); | |
| 348 #endif | |
| 349 | |
| 350 MP_CHECKOK(s_mp_pad(r, 4)); | |
| 351 MP_DIGIT(r, 3) = r3; | |
| 352 MP_DIGIT(r, 2) = r2; | |
| 353 MP_DIGIT(r, 1) = r1; | |
| 354 MP_DIGIT(r, 0) = r0; | |
| 355 MP_SIGN(r) = MP_ZPOS; | |
| 356 MP_USED(r) = 4; | |
| 357 | |
| 358 /* Do quick 'subract' if we've gone over | |
| 359 * (add the 2's complement of the curve field) */ | |
| 360 a3 = MP_DIGIT(&meth->irr,3); | |
| 361 if (carry || r3 > a3 || | |
| 362 ((r3 == a3) && mp_cmp(r,&meth->irr) != MP_LT)) { | |
| 363 a2 = MP_DIGIT(&meth->irr,2); | |
| 364 a1 = MP_DIGIT(&meth->irr,1); | |
| 365 a0 = MP_DIGIT(&meth->irr,0); | |
| 366 #ifndef MPI_AMD64_ADD | |
| 367 MP_SUB_BORROW(r0, a0, r0, 0, carry); | |
| 368 MP_SUB_BORROW(r1, a1, r1, carry, carry); | |
| 369 MP_SUB_BORROW(r2, a2, r2, carry, carry); | |
| 370 MP_SUB_BORROW(r3, a3, r3, carry, carry); | |
| 371 #else | |
| 372 __asm__ ( | |
| 373 "subq %4,%0 \n\t" | |
| 374 "sbbq %5,%1 \n\t" | |
| 375 "sbbq %6,%2 \n\t" | |
| 376 "sbbq %7,%3 \n\t" | |
| 377 : "=r"(r0), "=r"(r1), "=r"(r2), "=r"(r3) | |
| 378 : "r" (a0), "r" (a1), "r" (a2), "r" (a3), | |
| 379 "0" (r0), "1" (r1), "2" (r2), "3" (r3) | |
| 380 : "%cc" ); | |
| 381 #endif | |
| 382 MP_DIGIT(r, 3) = r3; | |
| 383 MP_DIGIT(r, 2) = r2; | |
| 384 MP_DIGIT(r, 1) = r1; | |
| 385 MP_DIGIT(r, 0) = r0; | |
| 386 } | |
| 387 | |
| 388 s_mp_clamp(r); | |
| 389 | |
| 390 CLEANUP: | |
| 391 return res; | |
| 392 } | |
| 393 | |
| 394 /* 5 words */ | |
| 395 mp_err | |
| 396 ec_GFp_add_5(const mp_int *a, const mp_int *b, mp_int *r, | |
| 397 const GFMethod *meth) | |
| 398 { | |
| 399 mp_err res = MP_OKAY; | |
| 400 mp_digit a0 = 0, a1 = 0, a2 = 0, a3 = 0, a4 = 0; | |
| 401 mp_digit r0 = 0, r1 = 0, r2 = 0, r3 = 0, r4 = 0; | |
| 402 mp_digit carry; | |
| 403 | |
| 404 switch(MP_USED(a)) { | |
| 405 case 5: | |
| 406 a4 = MP_DIGIT(a,4); | |
| 407 case 4: | |
| 408 a3 = MP_DIGIT(a,3); | |
| 409 case 3: | |
| 410 a2 = MP_DIGIT(a,2); | |
| 411 case 2: | |
| 412 a1 = MP_DIGIT(a,1); | |
| 413 case 1: | |
| 414 a0 = MP_DIGIT(a,0); | |
| 415 } | |
| 416 switch(MP_USED(b)) { | |
| 417 case 5: | |
| 418 r4 = MP_DIGIT(b,4); | |
| 419 case 4: | |
| 420 r3 = MP_DIGIT(b,3); | |
| 421 case 3: | |
| 422 r2 = MP_DIGIT(b,2); | |
| 423 case 2: | |
| 424 r1 = MP_DIGIT(b,1); | |
| 425 case 1: | |
| 426 r0 = MP_DIGIT(b,0); | |
| 427 } | |
| 428 | |
| 429 MP_ADD_CARRY(a0, r0, r0, 0, carry); | |
| 430 MP_ADD_CARRY(a1, r1, r1, carry, carry); | |
| 431 MP_ADD_CARRY(a2, r2, r2, carry, carry); | |
| 432 MP_ADD_CARRY(a3, r3, r3, carry, carry); | |
| 433 MP_ADD_CARRY(a4, r4, r4, carry, carry); | |
| 434 | |
| 435 MP_CHECKOK(s_mp_pad(r, 5)); | |
| 436 MP_DIGIT(r, 4) = r4; | |
| 437 MP_DIGIT(r, 3) = r3; | |
| 438 MP_DIGIT(r, 2) = r2; | |
| 439 MP_DIGIT(r, 1) = r1; | |
| 440 MP_DIGIT(r, 0) = r0; | |
| 441 MP_SIGN(r) = MP_ZPOS; | |
| 442 MP_USED(r) = 5; | |
| 443 | |
| 444 /* Do quick 'subract' if we've gone over | |
| 445 * (add the 2's complement of the curve field) */ | |
| 446 a4 = MP_DIGIT(&meth->irr,4); | |
| 447 if (carry || r4 > a4 || | |
| 448 ((r4 == a4) && mp_cmp(r,&meth->irr) != MP_LT)) { | |
| 449 a3 = MP_DIGIT(&meth->irr,3); | |
| 450 a2 = MP_DIGIT(&meth->irr,2); | |
| 451 a1 = MP_DIGIT(&meth->irr,1); | |
| 452 a0 = MP_DIGIT(&meth->irr,0); | |
| 453 MP_SUB_BORROW(r0, a0, r0, 0, carry); | |
| 454 MP_SUB_BORROW(r1, a1, r1, carry, carry); | |
| 455 MP_SUB_BORROW(r2, a2, r2, carry, carry); | |
| 456 MP_SUB_BORROW(r3, a3, r3, carry, carry); | |
| 457 MP_SUB_BORROW(r4, a4, r4, carry, carry); | |
| 458 MP_DIGIT(r, 4) = r4; | |
| 459 MP_DIGIT(r, 3) = r3; | |
| 460 MP_DIGIT(r, 2) = r2; | |
| 461 MP_DIGIT(r, 1) = r1; | |
| 462 MP_DIGIT(r, 0) = r0; | |
| 463 } | |
| 464 | |
| 465 s_mp_clamp(r); | |
| 466 | |
| 467 CLEANUP: | |
| 468 return res; | |
| 469 } | |
| 470 | |
| 471 /* 6 words */ | |
| 472 mp_err | |
| 473 ec_GFp_add_6(const mp_int *a, const mp_int *b, mp_int *r, | |
| 474 const GFMethod *meth) | |
| 475 { | |
| 476 mp_err res = MP_OKAY; | |
| 477 mp_digit a0 = 0, a1 = 0, a2 = 0, a3 = 0, a4 = 0, a5 = 0; | |
| 478 mp_digit r0 = 0, r1 = 0, r2 = 0, r3 = 0, r4 = 0, r5 = 0; | |
| 479 mp_digit carry; | |
| 480 | |
| 481 switch(MP_USED(a)) { | |
| 482 case 6: | |
| 483 a5 = MP_DIGIT(a,5); | |
| 484 case 5: | |
| 485 a4 = MP_DIGIT(a,4); | |
| 486 case 4: | |
| 487 a3 = MP_DIGIT(a,3); | |
| 488 case 3: | |
| 489 a2 = MP_DIGIT(a,2); | |
| 490 case 2: | |
| 491 a1 = MP_DIGIT(a,1); | |
| 492 case 1: | |
| 493 a0 = MP_DIGIT(a,0); | |
| 494 } | |
| 495 switch(MP_USED(b)) { | |
| 496 case 6: | |
| 497 r5 = MP_DIGIT(b,5); | |
| 498 case 5: | |
| 499 r4 = MP_DIGIT(b,4); | |
| 500 case 4: | |
| 501 r3 = MP_DIGIT(b,3); | |
| 502 case 3: | |
| 503 r2 = MP_DIGIT(b,2); | |
| 504 case 2: | |
| 505 r1 = MP_DIGIT(b,1); | |
| 506 case 1: | |
| 507 r0 = MP_DIGIT(b,0); | |
| 508 } | |
| 509 | |
| 510 MP_ADD_CARRY(a0, r0, r0, 0, carry); | |
| 511 MP_ADD_CARRY(a1, r1, r1, carry, carry); | |
| 512 MP_ADD_CARRY(a2, r2, r2, carry, carry); | |
| 513 MP_ADD_CARRY(a3, r3, r3, carry, carry); | |
| 514 MP_ADD_CARRY(a4, r4, r4, carry, carry); | |
| 515 MP_ADD_CARRY(a5, r5, r5, carry, carry); | |
| 516 | |
| 517 MP_CHECKOK(s_mp_pad(r, 6)); | |
| 518 MP_DIGIT(r, 5) = r5; | |
| 519 MP_DIGIT(r, 4) = r4; | |
| 520 MP_DIGIT(r, 3) = r3; | |
| 521 MP_DIGIT(r, 2) = r2; | |
| 522 MP_DIGIT(r, 1) = r1; | |
| 523 MP_DIGIT(r, 0) = r0; | |
| 524 MP_SIGN(r) = MP_ZPOS; | |
| 525 MP_USED(r) = 6; | |
| 526 | |
| 527 /* Do quick 'subract' if we've gone over | |
| 528 * (add the 2's complement of the curve field) */ | |
| 529 a5 = MP_DIGIT(&meth->irr,5); | |
| 530 if (carry || r5 > a5 || | |
| 531 ((r5 == a5) && mp_cmp(r,&meth->irr) != MP_LT)) { | |
| 532 a4 = MP_DIGIT(&meth->irr,4); | |
| 533 a3 = MP_DIGIT(&meth->irr,3); | |
| 534 a2 = MP_DIGIT(&meth->irr,2); | |
| 535 a1 = MP_DIGIT(&meth->irr,1); | |
| 536 a0 = MP_DIGIT(&meth->irr,0); | |
| 537 MP_SUB_BORROW(r0, a0, r0, 0, carry); | |
| 538 MP_SUB_BORROW(r1, a1, r1, carry, carry); | |
| 539 MP_SUB_BORROW(r2, a2, r2, carry, carry); | |
| 540 MP_SUB_BORROW(r3, a3, r3, carry, carry); | |
| 541 MP_SUB_BORROW(r4, a4, r4, carry, carry); | |
| 542 MP_SUB_BORROW(r5, a5, r5, carry, carry); | |
| 543 MP_DIGIT(r, 5) = r5; | |
| 544 MP_DIGIT(r, 4) = r4; | |
| 545 MP_DIGIT(r, 3) = r3; | |
| 546 MP_DIGIT(r, 2) = r2; | |
| 547 MP_DIGIT(r, 1) = r1; | |
| 548 MP_DIGIT(r, 0) = r0; | |
| 549 } | |
| 550 | |
| 551 s_mp_clamp(r); | |
| 552 | |
| 553 CLEANUP: | |
| 554 return res; | |
| 555 } | |
| 556 | |
| 557 /* | |
| 558 * The following subraction functions do in-line subractions based | |
| 559 * on our curve size. | |
| 560 * | |
| 561 * ... 3 words | |
| 562 */ | |
| 563 mp_err | |
| 564 ec_GFp_sub_3(const mp_int *a, const mp_int *b, mp_int *r, | |
| 565 const GFMethod *meth) | |
| 566 { | |
| 567 mp_err res = MP_OKAY; | |
| 568 mp_digit b0 = 0, b1 = 0, b2 = 0; | |
| 569 mp_digit r0 = 0, r1 = 0, r2 = 0; | |
| 570 mp_digit borrow; | |
| 571 | |
| 572 switch(MP_USED(a)) { | |
| 573 case 3: | |
| 574 r2 = MP_DIGIT(a,2); | |
| 575 case 2: | |
| 576 r1 = MP_DIGIT(a,1); | |
| 577 case 1: | |
| 578 r0 = MP_DIGIT(a,0); | |
| 579 } | |
| 580 switch(MP_USED(b)) { | |
| 581 case 3: | |
| 582 b2 = MP_DIGIT(b,2); | |
| 583 case 2: | |
| 584 b1 = MP_DIGIT(b,1); | |
| 585 case 1: | |
| 586 b0 = MP_DIGIT(b,0); | |
| 587 } | |
| 588 | |
| 589 #ifndef MPI_AMD64_ADD | |
| 590 MP_SUB_BORROW(r0, b0, r0, 0, borrow); | |
| 591 MP_SUB_BORROW(r1, b1, r1, borrow, borrow); | |
| 592 MP_SUB_BORROW(r2, b2, r2, borrow, borrow); | |
| 593 #else | |
| 594 __asm__ ( | |
| 595 "xorq %3,%3 \n\t" | |
| 596 "subq %4,%0 \n\t" | |
| 597 "sbbq %5,%1 \n\t" | |
| 598 "sbbq %6,%2 \n\t" | |
| 599 "adcq $0,%3 \n\t" | |
| 600 : "=r"(r0), "=r"(r1), "=r"(r2), "=r" (borrow) | |
| 601 : "r" (b0), "r" (b1), "r" (b2), | |
| 602 "0" (r0), "1" (r1), "2" (r2) | |
| 603 : "%cc" ); | |
| 604 #endif | |
| 605 | |
| 606 /* Do quick 'add' if we've gone under 0 | |
| 607 * (subtract the 2's complement of the curve field) */ | |
| 608 if (borrow) { | |
| 609 b2 = MP_DIGIT(&meth->irr,2); | |
| 610 b1 = MP_DIGIT(&meth->irr,1); | |
| 611 b0 = MP_DIGIT(&meth->irr,0); | |
| 612 #ifndef MPI_AMD64_ADD | |
| 613 MP_ADD_CARRY(b0, r0, r0, 0, borrow); | |
| 614 MP_ADD_CARRY(b1, r1, r1, borrow, borrow); | |
| 615 MP_ADD_CARRY(b2, r2, r2, borrow, borrow); | |
| 616 #else | |
| 617 __asm__ ( | |
| 618 "addq %3,%0 \n\t" | |
| 619 "adcq %4,%1 \n\t" | |
| 620 "adcq %5,%2 \n\t" | |
| 621 : "=r"(r0), "=r"(r1), "=r"(r2) | |
| 622 : "r" (b0), "r" (b1), "r" (b2), | |
| 623 "0" (r0), "1" (r1), "2" (r2) | |
| 624 : "%cc" ); | |
| 625 #endif | |
| 626 } | |
| 627 | |
| 628 #ifdef MPI_AMD64_ADD | |
| 629 /* compiler fakeout? */ | |
| 630 if ((r2 == b0) && (r1 == b0) && (r0 == b0)) { | |
| 631 MP_CHECKOK(s_mp_pad(r, 4)); | |
| 632 } | |
| 633 #endif | |
| 634 MP_CHECKOK(s_mp_pad(r, 3)); | |
| 635 MP_DIGIT(r, 2) = r2; | |
| 636 MP_DIGIT(r, 1) = r1; | |
| 637 MP_DIGIT(r, 0) = r0; | |
| 638 MP_SIGN(r) = MP_ZPOS; | |
| 639 MP_USED(r) = 3; | |
| 640 s_mp_clamp(r); | |
| 641 | |
| 642 CLEANUP: | |
| 643 return res; | |
| 644 } | |
| 645 | |
| 646 /* 4 words */ | |
| 647 mp_err | |
| 648 ec_GFp_sub_4(const mp_int *a, const mp_int *b, mp_int *r, | |
| 649 const GFMethod *meth) | |
| 650 { | |
| 651 mp_err res = MP_OKAY; | |
| 652 mp_digit b0 = 0, b1 = 0, b2 = 0, b3 = 0; | |
| 653 mp_digit r0 = 0, r1 = 0, r2 = 0, r3 = 0; | |
| 654 mp_digit borrow; | |
| 655 | |
| 656 switch(MP_USED(a)) { | |
| 657 case 4: | |
| 658 r3 = MP_DIGIT(a,3); | |
| 659 case 3: | |
| 660 r2 = MP_DIGIT(a,2); | |
| 661 case 2: | |
| 662 r1 = MP_DIGIT(a,1); | |
| 663 case 1: | |
| 664 r0 = MP_DIGIT(a,0); | |
| 665 } | |
| 666 switch(MP_USED(b)) { | |
| 667 case 4: | |
| 668 b3 = MP_DIGIT(b,3); | |
| 669 case 3: | |
| 670 b2 = MP_DIGIT(b,2); | |
| 671 case 2: | |
| 672 b1 = MP_DIGIT(b,1); | |
| 673 case 1: | |
| 674 b0 = MP_DIGIT(b,0); | |
| 675 } | |
| 676 | |
| 677 #ifndef MPI_AMD64_ADD | |
| 678 MP_SUB_BORROW(r0, b0, r0, 0, borrow); | |
| 679 MP_SUB_BORROW(r1, b1, r1, borrow, borrow); | |
| 680 MP_SUB_BORROW(r2, b2, r2, borrow, borrow); | |
| 681 MP_SUB_BORROW(r3, b3, r3, borrow, borrow); | |
| 682 #else | |
| 683 __asm__ ( | |
| 684 "xorq %4,%4 \n\t" | |
| 685 "subq %5,%0 \n\t" | |
| 686 "sbbq %6,%1 \n\t" | |
| 687 "sbbq %7,%2 \n\t" | |
| 688 "sbbq %8,%3 \n\t" | |
| 689 "adcq $0,%4 \n\t" | |
| 690 : "=r"(r0), "=r"(r1), "=r"(r2), "=r"(r3), "=r" (borrow) | |
| 691 : "r" (b0), "r" (b1), "r" (b2), "r" (b3), | |
| 692 "0" (r0), "1" (r1), "2" (r2), "3" (r3) | |
| 693 : "%cc" ); | |
| 694 #endif | |
| 695 | |
| 696 /* Do quick 'add' if we've gone under 0 | |
| 697 * (subtract the 2's complement of the curve field) */ | |
| 698 if (borrow) { | |
| 699 b3 = MP_DIGIT(&meth->irr,3); | |
| 700 b2 = MP_DIGIT(&meth->irr,2); | |
| 701 b1 = MP_DIGIT(&meth->irr,1); | |
| 702 b0 = MP_DIGIT(&meth->irr,0); | |
| 703 #ifndef MPI_AMD64_ADD | |
| 704 MP_ADD_CARRY(b0, r0, r0, 0, borrow); | |
| 705 MP_ADD_CARRY(b1, r1, r1, borrow, borrow); | |
| 706 MP_ADD_CARRY(b2, r2, r2, borrow, borrow); | |
| 707 MP_ADD_CARRY(b3, r3, r3, borrow, borrow); | |
| 708 #else | |
| 709 __asm__ ( | |
| 710 "addq %4,%0 \n\t" | |
| 711 "adcq %5,%1 \n\t" | |
| 712 "adcq %6,%2 \n\t" | |
| 713 "adcq %7,%3 \n\t" | |
| 714 : "=r"(r0), "=r"(r1), "=r"(r2), "=r"(r3) | |
| 715 : "r" (b0), "r" (b1), "r" (b2), "r" (b3), | |
| 716 "0" (r0), "1" (r1), "2" (r2), "3" (r3) | |
| 717 : "%cc" ); | |
| 718 #endif | |
| 719 } | |
| 720 #ifdef MPI_AMD64_ADD | |
| 721 /* compiler fakeout? */ | |
| 722 if ((r3 == b0) && (r1 == b0) && (r0 == b0)) { | |
| 723 MP_CHECKOK(s_mp_pad(r, 4)); | |
| 724 } | |
| 725 #endif | |
| 726 MP_CHECKOK(s_mp_pad(r, 4)); | |
| 727 MP_DIGIT(r, 3) = r3; | |
| 728 MP_DIGIT(r, 2) = r2; | |
| 729 MP_DIGIT(r, 1) = r1; | |
| 730 MP_DIGIT(r, 0) = r0; | |
| 731 MP_SIGN(r) = MP_ZPOS; | |
| 732 MP_USED(r) = 4; | |
| 733 s_mp_clamp(r); | |
| 734 | |
| 735 CLEANUP: | |
| 736 return res; | |
| 737 } | |
| 738 | |
| 739 /* 5 words */ | |
| 740 mp_err | |
| 741 ec_GFp_sub_5(const mp_int *a, const mp_int *b, mp_int *r, | |
| 742 const GFMethod *meth) | |
| 743 { | |
| 744 mp_err res = MP_OKAY; | |
| 745 mp_digit b0 = 0, b1 = 0, b2 = 0, b3 = 0, b4 = 0; | |
| 746 mp_digit r0 = 0, r1 = 0, r2 = 0, r3 = 0, r4 = 0; | |
| 747 mp_digit borrow; | |
| 748 | |
| 749 switch(MP_USED(a)) { | |
| 750 case 5: | |
| 751 r4 = MP_DIGIT(a,4); | |
| 752 case 4: | |
| 753 r3 = MP_DIGIT(a,3); | |
| 754 case 3: | |
| 755 r2 = MP_DIGIT(a,2); | |
| 756 case 2: | |
| 757 r1 = MP_DIGIT(a,1); | |
| 758 case 1: | |
| 759 r0 = MP_DIGIT(a,0); | |
| 760 } | |
| 761 switch(MP_USED(b)) { | |
| 762 case 5: | |
| 763 b4 = MP_DIGIT(b,4); | |
| 764 case 4: | |
| 765 b3 = MP_DIGIT(b,3); | |
| 766 case 3: | |
| 767 b2 = MP_DIGIT(b,2); | |
| 768 case 2: | |
| 769 b1 = MP_DIGIT(b,1); | |
| 770 case 1: | |
| 771 b0 = MP_DIGIT(b,0); | |
| 772 } | |
| 773 | |
| 774 MP_SUB_BORROW(r0, b0, r0, 0, borrow); | |
| 775 MP_SUB_BORROW(r1, b1, r1, borrow, borrow); | |
| 776 MP_SUB_BORROW(r2, b2, r2, borrow, borrow); | |
| 777 MP_SUB_BORROW(r3, b3, r3, borrow, borrow); | |
| 778 MP_SUB_BORROW(r4, b4, r4, borrow, borrow); | |
| 779 | |
| 780 /* Do quick 'add' if we've gone under 0 | |
| 781 * (subtract the 2's complement of the curve field) */ | |
| 782 if (borrow) { | |
| 783 b4 = MP_DIGIT(&meth->irr,4); | |
| 784 b3 = MP_DIGIT(&meth->irr,3); | |
| 785 b2 = MP_DIGIT(&meth->irr,2); | |
| 786 b1 = MP_DIGIT(&meth->irr,1); | |
| 787 b0 = MP_DIGIT(&meth->irr,0); | |
| 788 MP_ADD_CARRY(b0, r0, r0, 0, borrow); | |
| 789 MP_ADD_CARRY(b1, r1, r1, borrow, borrow); | |
| 790 MP_ADD_CARRY(b2, r2, r2, borrow, borrow); | |
| 791 MP_ADD_CARRY(b3, r3, r3, borrow, borrow); | |
| 792 } | |
| 793 MP_CHECKOK(s_mp_pad(r, 5)); | |
| 794 MP_DIGIT(r, 4) = r4; | |
| 795 MP_DIGIT(r, 3) = r3; | |
| 796 MP_DIGIT(r, 2) = r2; | |
| 797 MP_DIGIT(r, 1) = r1; | |
| 798 MP_DIGIT(r, 0) = r0; | |
| 799 MP_SIGN(r) = MP_ZPOS; | |
| 800 MP_USED(r) = 5; | |
| 801 s_mp_clamp(r); | |
| 802 | |
| 803 CLEANUP: | |
| 804 return res; | |
| 805 } | |
| 806 | |
| 807 /* 6 words */ | |
| 808 mp_err | |
| 809 ec_GFp_sub_6(const mp_int *a, const mp_int *b, mp_int *r, | |
| 810 const GFMethod *meth) | |
| 811 { | |
| 812 mp_err res = MP_OKAY; | |
| 813 mp_digit b0 = 0, b1 = 0, b2 = 0, b3 = 0, b4 = 0, b5 = 0; | |
| 814 mp_digit r0 = 0, r1 = 0, r2 = 0, r3 = 0, r4 = 0, r5 = 0; | |
| 815 mp_digit borrow; | |
| 816 | |
| 817 switch(MP_USED(a)) { | |
| 818 case 6: | |
| 819 r5 = MP_DIGIT(a,5); | |
| 820 case 5: | |
| 821 r4 = MP_DIGIT(a,4); | |
| 822 case 4: | |
| 823 r3 = MP_DIGIT(a,3); | |
| 824 case 3: | |
| 825 r2 = MP_DIGIT(a,2); | |
| 826 case 2: | |
| 827 r1 = MP_DIGIT(a,1); | |
| 828 case 1: | |
| 829 r0 = MP_DIGIT(a,0); | |
| 830 } | |
| 831 switch(MP_USED(b)) { | |
| 832 case 6: | |
| 833 b5 = MP_DIGIT(b,5); | |
| 834 case 5: | |
| 835 b4 = MP_DIGIT(b,4); | |
| 836 case 4: | |
| 837 b3 = MP_DIGIT(b,3); | |
| 838 case 3: | |
| 839 b2 = MP_DIGIT(b,2); | |
| 840 case 2: | |
| 841 b1 = MP_DIGIT(b,1); | |
| 842 case 1: | |
| 843 b0 = MP_DIGIT(b,0); | |
| 844 } | |
| 845 | |
| 846 MP_SUB_BORROW(r0, b0, r0, 0, borrow); | |
| 847 MP_SUB_BORROW(r1, b1, r1, borrow, borrow); | |
| 848 MP_SUB_BORROW(r2, b2, r2, borrow, borrow); | |
| 849 MP_SUB_BORROW(r3, b3, r3, borrow, borrow); | |
| 850 MP_SUB_BORROW(r4, b4, r4, borrow, borrow); | |
| 851 MP_SUB_BORROW(r5, b5, r5, borrow, borrow); | |
| 852 | |
| 853 /* Do quick 'add' if we've gone under 0 | |
| 854 * (subtract the 2's complement of the curve field) */ | |
| 855 if (borrow) { | |
| 856 b5 = MP_DIGIT(&meth->irr,5); | |
| 857 b4 = MP_DIGIT(&meth->irr,4); | |
| 858 b3 = MP_DIGIT(&meth->irr,3); | |
| 859 b2 = MP_DIGIT(&meth->irr,2); | |
| 860 b1 = MP_DIGIT(&meth->irr,1); | |
| 861 b0 = MP_DIGIT(&meth->irr,0); | |
| 862 MP_ADD_CARRY(b0, r0, r0, 0, borrow); | |
| 863 MP_ADD_CARRY(b1, r1, r1, borrow, borrow); | |
| 864 MP_ADD_CARRY(b2, r2, r2, borrow, borrow); | |
| 865 MP_ADD_CARRY(b3, r3, r3, borrow, borrow); | |
| 866 MP_ADD_CARRY(b4, r4, r4, borrow, borrow); | |
| 867 } | |
| 868 | |
| 869 MP_CHECKOK(s_mp_pad(r, 6)); | |
| 870 MP_DIGIT(r, 5) = r5; | |
| 871 MP_DIGIT(r, 4) = r4; | |
| 872 MP_DIGIT(r, 3) = r3; | |
| 873 MP_DIGIT(r, 2) = r2; | |
| 874 MP_DIGIT(r, 1) = r1; | |
| 875 MP_DIGIT(r, 0) = r0; | |
| 876 MP_SIGN(r) = MP_ZPOS; | |
| 877 MP_USED(r) = 6; | |
| 878 s_mp_clamp(r); | |
| 879 | |
| 880 CLEANUP: | |
| 881 return res; | |
| 882 } | |
| 883 | |
| 884 | |
| 885 /* Reduces an integer to a field element. */ | |
| 886 mp_err | |
| 887 ec_GFp_mod(const mp_int *a, mp_int *r, const GFMethod *meth) | |
| 888 { | |
| 889 return mp_mod(a, &meth->irr, r); | |
| 890 } | |
| 891 | |
| 892 /* Multiplies two field elements. */ | |
| 893 mp_err | |
| 894 ec_GFp_mul(const mp_int *a, const mp_int *b, mp_int *r, | |
| 895 const GFMethod *meth) | |
| 896 { | |
| 897 return mp_mulmod(a, b, &meth->irr, r); | |
| 898 } | |
| 899 | |
| 900 /* Squares a field element. */ | |
| 901 mp_err | |
| 902 ec_GFp_sqr(const mp_int *a, mp_int *r, const GFMethod *meth) | |
| 903 { | |
| 904 return mp_sqrmod(a, &meth->irr, r); | |
| 905 } | |
| 906 | |
| 907 /* Divides two field elements. If a is NULL, then returns the inverse of | |
| 908 * b. */ | |
| 909 mp_err | |
| 910 ec_GFp_div(const mp_int *a, const mp_int *b, mp_int *r, | |
| 911 const GFMethod *meth) | |
| 912 { | |
| 913 mp_err res = MP_OKAY; | |
| 914 mp_int t; | |
| 915 | |
| 916 /* If a is NULL, then return the inverse of b, otherwise return a/b. */ | |
| 917 if (a == NULL) { | |
| 918 return mp_invmod(b, &meth->irr, r); | |
| 919 } else { | |
| 920 /* MPI doesn't support divmod, so we implement it using invmod a
nd | |
| 921 * mulmod. */ | |
| 922 MP_CHECKOK(mp_init(&t)); | |
| 923 MP_CHECKOK(mp_invmod(b, &meth->irr, &t)); | |
| 924 MP_CHECKOK(mp_mulmod(a, &t, &meth->irr, r)); | |
| 925 CLEANUP: | |
| 926 mp_clear(&t); | |
| 927 return res; | |
| 928 } | |
| 929 } | |
| 930 | |
| 931 /* Wrapper functions for generic binary polynomial field arithmetic. */ | |
| 932 | |
| 933 /* Adds two field elements. */ | |
| 934 mp_err | |
| 935 ec_GF2m_add(const mp_int *a, const mp_int *b, mp_int *r, | |
| 936 const GFMethod *meth) | |
| 937 { | |
| 938 return mp_badd(a, b, r); | |
| 939 } | |
| 940 | |
| 941 /* Negates a field element. Note that for binary polynomial fields, the | |
| 942 * negation of a field element is the field element itself. */ | |
| 943 mp_err | |
| 944 ec_GF2m_neg(const mp_int *a, mp_int *r, const GFMethod *meth) | |
| 945 { | |
| 946 if (a == r) { | |
| 947 return MP_OKAY; | |
| 948 } else { | |
| 949 return mp_copy(a, r); | |
| 950 } | |
| 951 } | |
| 952 | |
| 953 /* Reduces a binary polynomial to a field element. */ | |
| 954 mp_err | |
| 955 ec_GF2m_mod(const mp_int *a, mp_int *r, const GFMethod *meth) | |
| 956 { | |
| 957 return mp_bmod(a, meth->irr_arr, r); | |
| 958 } | |
| 959 | |
| 960 /* Multiplies two field elements. */ | |
| 961 mp_err | |
| 962 ec_GF2m_mul(const mp_int *a, const mp_int *b, mp_int *r, | |
| 963 const GFMethod *meth) | |
| 964 { | |
| 965 return mp_bmulmod(a, b, meth->irr_arr, r); | |
| 966 } | |
| 967 | |
| 968 /* Squares a field element. */ | |
| 969 mp_err | |
| 970 ec_GF2m_sqr(const mp_int *a, mp_int *r, const GFMethod *meth) | |
| 971 { | |
| 972 return mp_bsqrmod(a, meth->irr_arr, r); | |
| 973 } | |
| 974 | |
| 975 /* Divides two field elements. If a is NULL, then returns the inverse of | |
| 976 * b. */ | |
| 977 mp_err | |
| 978 ec_GF2m_div(const mp_int *a, const mp_int *b, mp_int *r, | |
| 979 const GFMethod *meth) | |
| 980 { | |
| 981 mp_err res = MP_OKAY; | |
| 982 mp_int t; | |
| 983 | |
| 984 /* If a is NULL, then return the inverse of b, otherwise return a/b. */ | |
| 985 if (a == NULL) { | |
| 986 /* The GF(2^m) portion of MPI doesn't support invmod, so we | |
| 987 * compute 1/b. */ | |
| 988 MP_CHECKOK(mp_init(&t)); | |
| 989 MP_CHECKOK(mp_set_int(&t, 1)); | |
| 990 MP_CHECKOK(mp_bdivmod(&t, b, &meth->irr, meth->irr_arr, r)); | |
| 991 CLEANUP: | |
| 992 mp_clear(&t); | |
| 993 return res; | |
| 994 } else { | |
| 995 return mp_bdivmod(a, b, &meth->irr, meth->irr_arr, r); | |
| 996 } | |
| 997 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 14249009:
Change the NSS and NSPR source tree to the new directory structure to be (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/deps/third_party/nss/