| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Salsa20 stream cipher |
| 4 | * |
| 5 | * (c) 2015 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of Catacomb. |
| 11 | * |
| 12 | * Catacomb is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU Library General Public License as |
| 14 | * published by the Free Software Foundation; either version 2 of the |
| 15 | * License, or (at your option) any later version. |
| 16 | * |
| 17 | * Catacomb is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU Library General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU Library General Public |
| 23 | * License along with Catacomb; if not, write to the Free |
| 24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 25 | * MA 02111-1307, USA. |
| 26 | */ |
| 27 | |
| 28 | /*----- Header files ------------------------------------------------------*/ |
| 29 | |
| 30 | #include "config.h" |
| 31 | |
| 32 | #include <stdarg.h> |
| 33 | |
| 34 | #include <mLib/bits.h> |
| 35 | |
| 36 | #include "arena.h" |
| 37 | #include "dispatch.h" |
| 38 | #include "gcipher.h" |
| 39 | #include "grand.h" |
| 40 | #include "keysz.h" |
| 41 | #include "paranoia.h" |
| 42 | #include "rsvr.h" |
| 43 | #include "salsa20.h" |
| 44 | #include "salsa20-core.h" |
| 45 | |
| 46 | /*----- Global variables --------------------------------------------------*/ |
| 47 | |
| 48 | const octet salsa20_keysz[] = { KSZ_SET, 32, 16, 10, 0 }; |
| 49 | |
| 50 | /*----- The Salsa20 core function and utilities ---------------------------*/ |
| 51 | |
| 52 | /* --- @core@ --- * |
| 53 | * |
| 54 | * Arguments: @unsigned r@ = number of rounds |
| 55 | * @const salsa20_matrix src@ = input matrix |
| 56 | * @salsa20_matrix dest@ = where to put the output |
| 57 | * |
| 58 | * Returns: --- |
| 59 | * |
| 60 | * |
| 61 | * Use: Apply the Salsa20/r core function to @src@, writing the |
| 62 | * result to @dest@. This consists of @r@ rounds followed by |
| 63 | * the feedforward step. |
| 64 | */ |
| 65 | |
| 66 | CPU_DISPATCH(static, (void), void, core, |
| 67 | (unsigned r, const salsa20_matrix src, salsa20_matrix dest), |
| 68 | (r, src, dest), pick_core, simple_core); |
| 69 | |
| 70 | static void simple_core(unsigned r, const salsa20_matrix src, |
| 71 | salsa20_matrix dest) |
| 72 | { SALSA20_nR(dest, src, r); SALSA20_FFWD(dest, src); } |
| 73 | |
| 74 | #if CPUFAM_X86 || CPUFAM_AMD64 |
| 75 | extern core__functype salsa20_core_x86ish_sse2; |
| 76 | extern core__functype salsa20_core_x86ish_avx; |
| 77 | #endif |
| 78 | |
| 79 | #if CPUFAM_ARMEL |
| 80 | extern core__functype salsa20_core_arm_neon; |
| 81 | #endif |
| 82 | |
| 83 | #if CPUFAM_ARM64 |
| 84 | extern core__functype salsa20_core_arm64; |
| 85 | #endif |
| 86 | |
| 87 | static core__functype *pick_core(void) |
| 88 | { |
| 89 | #if CPUFAM_X86 || CPUFAM_AMD64 |
| 90 | DISPATCH_PICK_COND(salsa20_core, salsa20_core_x86ish_avx, |
| 91 | cpu_feature_p(CPUFEAT_X86_AVX)); |
| 92 | DISPATCH_PICK_COND(salsa20_core, salsa20_core_x86ish_sse2, |
| 93 | cpu_feature_p(CPUFEAT_X86_SSE2)); |
| 94 | #endif |
| 95 | #if CPUFAM_ARMEL |
| 96 | DISPATCH_PICK_COND(salsa20_core, salsa20_core_arm_neon, |
| 97 | cpu_feature_p(CPUFEAT_ARM_NEON)); |
| 98 | #endif |
| 99 | #if CPUFAM_ARM64 |
| 100 | DISPATCH_PICK_COND(salsa20_core, salsa20_core_arm64, |
| 101 | cpu_feature_p(CPUFEAT_ARM_NEON)); |
| 102 | #endif |
| 103 | DISPATCH_PICK_FALLBACK(salsa20_core, simple_core); |
| 104 | } |
| 105 | |
| 106 | /* --- @populate@ --- * |
| 107 | * |
| 108 | * Arguments: @salsa20_matrix a@ = a matrix to fill in |
| 109 | * @const void *key@ = pointer to key material |
| 110 | * @size_t ksz@ = size of key |
| 111 | * |
| 112 | * Returns: --- |
| 113 | * |
| 114 | * Use: Fills in a Salsa20 matrix from the key, setting the |
| 115 | * appropriate constants according to the key length. The nonce |
| 116 | * and position words are left uninitialized. |
| 117 | */ |
| 118 | |
| 119 | static void populate(salsa20_matrix a, const void *key, size_t ksz) |
| 120 | { |
| 121 | const octet *k = key; |
| 122 | |
| 123 | KSZ_ASSERT(salsa20, ksz); |
| 124 | |
| 125 | /* Here's the pattern of key, constant, nonce, and counter pieces in the |
| 126 | * matrix, before and after our permutation. |
| 127 | * |
| 128 | * [ C0 K0 K1 K2 ] [ C0 C1 C2 C3 ] |
| 129 | * [ K3 C1 N0 N1 ] --> [ K3 T1 K7 K2 ] |
| 130 | * [ T0 T1 C2 K4 ] [ T0 K6 K1 N1 ] |
| 131 | * [ K5 K6 K7 C3 ] [ K5 K0 N0 K4 ] |
| 132 | */ |
| 133 | |
| 134 | a[13] = LOAD32_L(k + 0); |
| 135 | a[10] = LOAD32_L(k + 4); |
| 136 | if (ksz == 10) { |
| 137 | a[ 7] = LOAD16_L(k + 8); |
| 138 | a[ 4] = 0; |
| 139 | } else { |
| 140 | a[ 7] = LOAD32_L(k + 8); |
| 141 | a[ 4] = LOAD32_L(k + 12); |
| 142 | } |
| 143 | if (ksz <= 16) { |
| 144 | a[15] = a[13]; |
| 145 | a[12] = a[10]; |
| 146 | a[ 9] = a[ 7]; |
| 147 | a[ 6] = a[ 4]; |
| 148 | a[ 0] = SALSA20_A128; |
| 149 | a[ 1] = SALSA20_B128; |
| 150 | a[ 2] = ksz == 10 ? SALSA20_C80 : SALSA20_C128; |
| 151 | a[ 3] = SALSA20_D128; |
| 152 | } else { |
| 153 | a[15] = LOAD32_L(k + 16); |
| 154 | a[12] = LOAD32_L(k + 20); |
| 155 | a[ 9] = LOAD32_L(k + 24); |
| 156 | a[ 6] = LOAD32_L(k + 28); |
| 157 | a[ 0] = SALSA20_A256; |
| 158 | a[ 1] = SALSA20_B256; |
| 159 | a[ 2] = SALSA20_C256; |
| 160 | a[ 3] = SALSA20_D256; |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | /*----- Salsa20 implementation --------------------------------------------*/ |
| 165 | |
| 166 | static const octet zerononce[XSALSA20_NONCESZ]; |
| 167 | |
| 168 | /* --- @salsa20_init@ --- * |
| 169 | * |
| 170 | * Arguments: @salsa20_ctx *ctx@ = context to fill in |
| 171 | * @const void *key@ = pointer to key material |
| 172 | * @size_t ksz@ = size of key (either 32 or 16) |
| 173 | * @const void *nonce@ = initial nonce, or null |
| 174 | * |
| 175 | * Returns: --- |
| 176 | * |
| 177 | * Use: Initializes a Salsa20 context ready for use. |
| 178 | */ |
| 179 | |
| 180 | void salsa20_init(salsa20_ctx *ctx, const void *key, size_t ksz, |
| 181 | const void *nonce) |
| 182 | { |
| 183 | populate(ctx->a, key, ksz); |
| 184 | salsa20_setnonce(ctx, nonce ? nonce : zerononce); |
| 185 | } |
| 186 | |
| 187 | /* --- @salsa20_setnonce{,_ietf}@ --- * |
| 188 | * |
| 189 | * Arguments: @salsa20_ctx *ctx@ = pointer to context |
| 190 | * @const void *nonce@ = the nonce (@SALSA20_NONCESZ@ or |
| 191 | * @SALSA20_IETF_NONCESZ@ bytes) |
| 192 | * |
| 193 | * Returns: --- |
| 194 | * |
| 195 | * Use: Set a new nonce in the context @ctx@, e.g., for processing a |
| 196 | * different message. The stream position is reset to zero (see |
| 197 | * @salsa20_seek@ etc.). |
| 198 | */ |
| 199 | |
| 200 | void salsa20_setnonce(salsa20_ctx *ctx, const void *nonce) |
| 201 | { |
| 202 | const octet *n = nonce; |
| 203 | |
| 204 | ctx->a[14] = LOAD32_L(n + 0); |
| 205 | ctx->a[11] = LOAD32_L(n + 4); |
| 206 | salsa20_seek(ctx, 0); |
| 207 | } |
| 208 | |
| 209 | void salsa20_setnonce_ietf(salsa20_ctx *ctx, const void *nonce) |
| 210 | { |
| 211 | const octet *n = nonce; |
| 212 | |
| 213 | ctx->a[ 5] = LOAD32_L(n + 0); |
| 214 | ctx->a[14] = LOAD32_L(n + 4); |
| 215 | ctx->a[11] = LOAD32_L(n + 8); |
| 216 | salsa20_seek_ietf(ctx, 0); |
| 217 | } |
| 218 | |
| 219 | /* --- @salsa20_seek{,u64,_ietf}@ --- * |
| 220 | * |
| 221 | * Arguments: @salsa20_ctx *ctx@ = pointer to context |
| 222 | * @unsigned long i@, @kludge64 i@, @uint32@ = new position |
| 223 | * |
| 224 | * Returns: --- |
| 225 | * |
| 226 | * Use: Sets a new stream position, in units of Salsa20 output |
| 227 | * blocks, which are @SALSA20_OUTSZ@ bytes each. Byte |
| 228 | * granularity can be achieved by calling @salsa20R_encrypt@ |
| 229 | * appropriately. |
| 230 | */ |
| 231 | |
| 232 | void salsa20_seek(salsa20_ctx *ctx, unsigned long i) |
| 233 | { kludge64 ii; ASSIGN64(ii, i); salsa20_seeku64(ctx, ii); } |
| 234 | |
| 235 | void salsa20_seeku64(salsa20_ctx *ctx, kludge64 i) |
| 236 | { |
| 237 | ctx->a[8] = LO64(i); ctx->a[5] = HI64(i); |
| 238 | ctx->off = 0; |
| 239 | } |
| 240 | |
| 241 | void salsa20_seek_ietf(salsa20_ctx *ctx, uint32 i) |
| 242 | { ctx->a[8] = i; } |
| 243 | |
| 244 | /* --- @salsa20_tell{,u64,_ietf}@ --- * |
| 245 | * |
| 246 | * Arguments: @salsa20_ctx *ctx@ = pointer to context |
| 247 | * |
| 248 | * Returns: The current position in the output stream, in blocks, |
| 249 | * rounding upwards. |
| 250 | */ |
| 251 | |
| 252 | unsigned long salsa20_tell(salsa20_ctx *ctx) |
| 253 | { kludge64 i = salsa20_tellu64(ctx); return (GET64(unsigned long, i)); } |
| 254 | |
| 255 | kludge64 salsa20_tellu64(salsa20_ctx *ctx) |
| 256 | { kludge64 i; SET64(i, ctx->a[5], ctx->a[8]); return (i); } |
| 257 | |
| 258 | uint32 salsa20_tell_ietf(salsa20_ctx *ctx) |
| 259 | { return (ctx->a[5]); } |
| 260 | |
| 261 | /* --- @salsa20{,12,8}_encrypt@ --- * |
| 262 | * |
| 263 | * Arguments: @salsa20_ctx *ctx@ = pointer to context |
| 264 | * @const void *src@ = source buffer (or null) |
| 265 | * @void *dest@ = destination buffer (or null) |
| 266 | * @size_t sz@ = size of the buffers |
| 267 | * |
| 268 | * Returns: --- |
| 269 | * |
| 270 | * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@. |
| 271 | * Salsa20 works by XORing plaintext with a keystream, so |
| 272 | * encryption and decryption are the same operation. If @dest@ |
| 273 | * is null then ignore @src@ and skip @sz@ bytes of the |
| 274 | * keystream. If @src@ is null, then just write the keystream |
| 275 | * to @dest@. |
| 276 | */ |
| 277 | |
| 278 | static const rsvr_policy policy = { 0, SALSA20_OUTSZ, SALSA20_OUTSZ }; |
| 279 | |
| 280 | #define SALSA20_ENCRYPT(r, ctx, src, dest, sz) \ |
| 281 | SALSA20_DECOR(salsa20, r, _encrypt)(ctx, src, dest, sz) |
| 282 | #define DEFENCRYPT(r) \ |
| 283 | void SALSA20_ENCRYPT(r, salsa20_ctx *ctx, const void *src, \ |
| 284 | void *dest, size_t sz) \ |
| 285 | { \ |
| 286 | salsa20_matrix b; \ |
| 287 | const octet *s = src; \ |
| 288 | octet *d = dest; \ |
| 289 | rsvr_plan plan; \ |
| 290 | kludge64 pos, delta; \ |
| 291 | \ |
| 292 | rsvr_mkplan(&plan, &policy, ctx->off, sz); \ |
| 293 | \ |
| 294 | if (plan.head) { \ |
| 295 | if (!ctx->off) { \ |
| 296 | core(r, ctx->a, b); SALSA20_STEP(ctx->a); \ |
| 297 | SALSA20_PREPBUF(ctx, b); \ |
| 298 | } \ |
| 299 | SALSA20_OUTBUF(ctx, d, s, plan.head); \ |
| 300 | } \ |
| 301 | \ |
| 302 | ctx->off -= plan.from_rsvr; \ |
| 303 | \ |
| 304 | if (!d) { \ |
| 305 | if (plan.from_input) { \ |
| 306 | pos = salsa20_tellu64(ctx); \ |
| 307 | ASSIGN64(delta, plan.from_input/SALSA20_OUTSZ); \ |
| 308 | ADD64(pos, pos, delta); \ |
| 309 | salsa20_seeku64(ctx, pos); \ |
| 310 | } \ |
| 311 | } else if (!s) while (plan.from_input) { \ |
| 312 | core(r, ctx->a, b); SALSA20_STEP(ctx->a); \ |
| 313 | SALSA20_GENFULL(b, d); plan.from_input -= SALSA20_OUTSZ; \ |
| 314 | } else while (plan.from_input) { \ |
| 315 | core(r, ctx->a, b); SALSA20_STEP(ctx->a); \ |
| 316 | SALSA20_MIXFULL(b, d, s); plan.from_input -= SALSA20_OUTSZ; \ |
| 317 | } \ |
| 318 | \ |
| 319 | if (plan.tail) { \ |
| 320 | core(r, ctx->a, b); SALSA20_STEP(ctx->a); \ |
| 321 | SALSA20_PREPBUF(ctx, b); \ |
| 322 | SALSA20_OUTBUF(ctx, d, s, plan.tail); \ |
| 323 | } \ |
| 324 | } |
| 325 | SALSA20_VARS(DEFENCRYPT) |
| 326 | |
| 327 | /*----- HSalsa20 implementation -------------------------------------------*/ |
| 328 | |
| 329 | #define HSALSA20_RAW(r, ctx, src, dest) \ |
| 330 | SALSA20_DECOR(hsalsa20, r, _raw)(ctx, src, dest) |
| 331 | #define HSALSA20_PRF(r, ctx, src, dest) \ |
| 332 | SALSA20_DECOR(hsalsa20, r, _prf)(ctx, src, dest) |
| 333 | |
| 334 | /* --- @hsalsa20{,12,8}_prf@ --- * |
| 335 | * |
| 336 | * Arguments: @salsa20_ctx *ctx@ = pointer to context |
| 337 | * @const void *src@ = the input (@HSALSA20_INSZ@ bytes) |
| 338 | * @void *dest@ = the output (@HSALSA20_OUTSZ@ bytes) |
| 339 | * |
| 340 | * Returns: --- |
| 341 | * |
| 342 | * Use: Apply the HSalsa20/r pseudorandom function to @src@, writing |
| 343 | * the result to @out@. |
| 344 | */ |
| 345 | |
| 346 | #define DEFHSALSA20(r) \ |
| 347 | static void HSALSA20_RAW(r, salsa20_matrix k, \ |
| 348 | const uint32 *src, uint32 *dest) \ |
| 349 | { \ |
| 350 | salsa20_matrix a; \ |
| 351 | int i; \ |
| 352 | \ |
| 353 | /* --- HSalsa20, computed from full Salsa20 --- * \ |
| 354 | * \ |
| 355 | * The security proof makes use of the fact that HSalsa20 (i.e., \ |
| 356 | * without the final feedforward step) can be computed from full \ |
| 357 | * Salsa20 using only knowledge of the non-secret input. I don't \ |
| 358 | * want to compromise the performance of the main function by \ |
| 359 | * making the feedforward step separate, but this operation is less \ |
| 360 | * speed critical, so we do it the harder way. \ |
| 361 | */ \ |
| 362 | \ |
| 363 | for (i = 0; i < 4; i++) k[14 - 3*i] = src[i]; \ |
| 364 | core(r, k, a); \ |
| 365 | for (i = 0; i < 4; i++) dest[i] = a[5*i] - k[i]; \ |
| 366 | for (i = 4; i < 8; i++) dest[i] = a[i + 2] - k[26 - 3*i]; \ |
| 367 | } \ |
| 368 | \ |
| 369 | void HSALSA20_PRF(r, salsa20_ctx *ctx, const void *src, void *dest) \ |
| 370 | { \ |
| 371 | const octet *s = src; \ |
| 372 | octet *d = dest; \ |
| 373 | uint32 in[4], out[8]; \ |
| 374 | int i; \ |
| 375 | \ |
| 376 | for (i = 0; i < 4; i++) in[i] = LOAD32_L(s + 4*i); \ |
| 377 | HSALSA20_RAW(r, ctx->a, in, out); \ |
| 378 | for (i = 0; i < 8; i++) STORE32_L(d + 4*i, out[i]); \ |
| 379 | } |
| 380 | SALSA20_VARS(DEFHSALSA20) |
| 381 | |
| 382 | /*----- XSalsa20 implementation -------------------------------------------*/ |
| 383 | |
| 384 | /* --- Some convenient macros for naming functions --- * |
| 385 | * |
| 386 | * Because the crypto core is involved in XSalsa20/r's per-nonce setup, we |
| 387 | * need to take an interest in the number of rounds in most of the various |
| 388 | * functions, and it will probably help if we distinguish the context |
| 389 | * structures for the various versions. |
| 390 | */ |
| 391 | |
| 392 | #define XSALSA20_CTX(r) SALSA20_DECOR(xsalsa20, r, _ctx) |
| 393 | #define XSALSA20_INIT(r, ctx, k, ksz, n) \ |
| 394 | SALSA20_DECOR(xsalsa20, r, _init)(ctx, k, ksz, n) |
| 395 | #define XSALSA20_SETNONCE(r, ctx, n) \ |
| 396 | SALSA20_DECOR(xsalsa20, r, _setnonce)(ctx, n) |
| 397 | #define XSALSA20_SEEK(r, ctx, i) \ |
| 398 | SALSA20_DECOR(xsalsa20, r, _seek)(ctx, i) |
| 399 | #define XSALSA20_SEEKU64(r, ctx, i) \ |
| 400 | SALSA20_DECOR(xsalsa20, r, _seeku64)(ctx, i) |
| 401 | #define XSALSA20_TELL(r, ctx) \ |
| 402 | SALSA20_DECOR(xsalsa20, r, _tell)(ctx) |
| 403 | #define XSALSA20_TELLU64(r, ctx) \ |
| 404 | SALSA20_DECOR(xsalsa20, r, _tellu64)(ctx) |
| 405 | #define XSALSA20_ENCRYPT(r, ctx, src, dest, sz) \ |
| 406 | SALSA20_DECOR(xsalsa20, r, _encrypt)(ctx, src, dest, sz) |
| 407 | |
| 408 | /* --- @xsalsa20{,12,8}_init@ --- * |
| 409 | * |
| 410 | * Arguments: @xsalsa20R_ctx *ctx@ = the context to fill in |
| 411 | * @const void *key@ = pointer to key material |
| 412 | * @size_t ksz@ = size of key (either 32 or 16) |
| 413 | * @const void *nonce@ = initial nonce, or null |
| 414 | * |
| 415 | * Returns: --- |
| 416 | * |
| 417 | * Use: Initializes an XSalsa20/r context ready for use. |
| 418 | * |
| 419 | * There is a different function for each number of rounds, |
| 420 | * unlike for plain Salsa20. |
| 421 | */ |
| 422 | |
| 423 | #define DEFXINIT(r) \ |
| 424 | void XSALSA20_INIT(r, XSALSA20_CTX(r) *ctx, \ |
| 425 | const void *key, size_t ksz, const void *nonce) \ |
| 426 | { \ |
| 427 | populate(ctx->k, key, ksz); \ |
| 428 | ctx->s.a[ 0] = SALSA20_A256; \ |
| 429 | ctx->s.a[ 1] = SALSA20_B256; \ |
| 430 | ctx->s.a[ 2] = SALSA20_C256; \ |
| 431 | ctx->s.a[ 3] = SALSA20_D256; \ |
| 432 | XSALSA20_SETNONCE(r, ctx, nonce ? nonce : zerononce); \ |
| 433 | } |
| 434 | SALSA20_VARS(DEFXINIT) |
| 435 | |
| 436 | /* --- @xsalsa20{,12,8}_setnonce@ --- * |
| 437 | * |
| 438 | * Arguments: @xsalsa20R_ctx *ctx@ = pointer to context |
| 439 | * @const void *nonce@ = the nonce (@XSALSA20_NONCESZ@ bytes) |
| 440 | * |
| 441 | * Returns: --- |
| 442 | * |
| 443 | * Use: Set a new nonce in the context @ctx@, e.g., for processing a |
| 444 | * different message. The stream position is reset to zero (see |
| 445 | * @salsa20_seek@ etc.). |
| 446 | * |
| 447 | * There is a different function for each number of rounds, |
| 448 | * unlike for plain Salsa20. |
| 449 | */ |
| 450 | |
| 451 | #define DEFXNONCE(r) \ |
| 452 | void XSALSA20_SETNONCE(r, XSALSA20_CTX(r) *ctx, const void *nonce) \ |
| 453 | { \ |
| 454 | const octet *n = nonce; \ |
| 455 | uint32 in[4], out[8]; \ |
| 456 | int i; \ |
| 457 | \ |
| 458 | for (i = 0; i < 4; i++) in[i] = LOAD32_L(n + 4*i); \ |
| 459 | HSALSA20_RAW(r, ctx->k, in, out); \ |
| 460 | for (i = 0; i < 4; i++) ctx->s.a[13 - 3*i] = out[i]; \ |
| 461 | for (i = 4; i < 8; i++) ctx->s.a[27 - 3*i] = out[i]; \ |
| 462 | salsa20_setnonce(&ctx->s, n + 16); \ |
| 463 | } |
| 464 | SALSA20_VARS(DEFXNONCE) |
| 465 | |
| 466 | /* --- @xsalsa20{,12,8}_seek{,u64}@ --- * |
| 467 | * |
| 468 | * Arguments: @xsalsa20R_ctx *ctx@ = pointer to context |
| 469 | * @unsigned long i@, @kludge64 i@ = new position to set |
| 470 | * |
| 471 | * Returns: --- |
| 472 | * |
| 473 | * Use: Sets a new stream position, in units of Salsa20 output |
| 474 | * blocks, which are @XSALSA20_OUTSZ@ bytes each. Byte |
| 475 | * granularity can be achieved by calling @xsalsa20R_encrypt@ |
| 476 | * appropriately. |
| 477 | * |
| 478 | * There is a different function for each number of rounds, |
| 479 | * unlike for plain Salsa20, because the context structures are |
| 480 | * different. |
| 481 | */ |
| 482 | |
| 483 | /* --- @xsalsa20{,12,8}_tell{,u64}@ --- * |
| 484 | * |
| 485 | * Arguments: @salsa20_ctx *ctx@ = pointer to context |
| 486 | * |
| 487 | * Returns: The current position in the output stream, in blocks, |
| 488 | * rounding upwards. |
| 489 | * |
| 490 | * There is a different function for each number of rounds, |
| 491 | * unlike for plain Salsa20, because the context structures are |
| 492 | * different. |
| 493 | */ |
| 494 | |
| 495 | /* --- @xsalsa20{,12,8}_encrypt@ --- * |
| 496 | * |
| 497 | * Arguments: @xsalsa20R_ctx *ctx@ = pointer to context |
| 498 | * @const void *src@ = source buffer (or null) |
| 499 | * @void *dest@ = destination buffer (or null) |
| 500 | * @size_t sz@ = size of the buffers |
| 501 | * |
| 502 | * Returns: --- |
| 503 | * |
| 504 | * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@. |
| 505 | * XSalsa20 works by XORing plaintext with a keystream, so |
| 506 | * encryption and decryption are the same operation. If @dest@ |
| 507 | * is null then ignore @src@ and skip @sz@ bytes of the |
| 508 | * keystream. If @src@ is null, then just write the keystream |
| 509 | * to @dest@. |
| 510 | */ |
| 511 | |
| 512 | #define DEFXPASSTHRU(r) \ |
| 513 | void XSALSA20_SEEK(r, XSALSA20_CTX(r) *ctx, unsigned long i) \ |
| 514 | { salsa20_seek(&ctx->s, i); } \ |
| 515 | void XSALSA20_SEEKU64(r, XSALSA20_CTX(r) *ctx, kludge64 i) \ |
| 516 | { salsa20_seeku64(&ctx->s, i); } \ |
| 517 | unsigned long XSALSA20_TELL(r, XSALSA20_CTX(r) *ctx) \ |
| 518 | { return salsa20_tell(&ctx->s); } \ |
| 519 | kludge64 XSALSA20_TELLU64(r, XSALSA20_CTX(r) *ctx) \ |
| 520 | { return salsa20_tellu64(&ctx->s); } \ |
| 521 | void XSALSA20_ENCRYPT(r, XSALSA20_CTX(r) *ctx, \ |
| 522 | const void *src, void *dest, size_t sz) \ |
| 523 | { SALSA20_ENCRYPT(r, &ctx->s, src, dest, sz); } |
| 524 | SALSA20_VARS(DEFXPASSTHRU) |
| 525 | |
| 526 | /*----- Generic cipher interface ------------------------------------------*/ |
| 527 | |
| 528 | typedef struct gctx { gcipher c; salsa20_ctx ctx; } gctx; |
| 529 | |
| 530 | static void gsetiv(gcipher *c, const void *iv) |
| 531 | { gctx *g = (gctx *)c; salsa20_setnonce(&g->ctx, iv); } |
| 532 | |
| 533 | static void gsetiv_ietf(gcipher *c, const void *iv) |
| 534 | { gctx *g = (gctx *)c; salsa20_setnonce_ietf(&g->ctx, iv); } |
| 535 | |
| 536 | static void gdestroy(gcipher *c) |
| 537 | { gctx *g = (gctx *)c; BURN(*g); S_DESTROY(g); } |
| 538 | |
| 539 | static gcipher *ginit(const void *k, size_t sz, const gcipher_ops *ops) |
| 540 | { |
| 541 | gctx *g = S_CREATE(gctx); |
| 542 | g->c.ops = ops; |
| 543 | salsa20_init(&g->ctx, k, sz, 0); |
| 544 | return (&g->c); |
| 545 | } |
| 546 | |
| 547 | #define DEFGCIPHER(r) \ |
| 548 | \ |
| 549 | static const gcipher_ops gops_##r, gops_##r##_ietf; \ |
| 550 | \ |
| 551 | static gcipher *ginit_##r(const void *k, size_t sz) \ |
| 552 | { return (ginit(k, sz, &gops_##r)); } \ |
| 553 | \ |
| 554 | static gcipher *ginit_##r##_ietf(const void *k, size_t sz) \ |
| 555 | { return (ginit(k, sz, &gops_##r##_ietf)); } \ |
| 556 | \ |
| 557 | static void gencrypt_##r(gcipher *c, const void *s, \ |
| 558 | void *t, size_t sz) \ |
| 559 | { gctx *g = (gctx *)c; SALSA20_ENCRYPT(r, &g->ctx, s, t, sz); } \ |
| 560 | \ |
| 561 | static const gcipher_ops gops_##r = { \ |
| 562 | &SALSA20_DECOR(salsa20, r, ), \ |
| 563 | gencrypt_##r, gencrypt_##r, gdestroy, gsetiv, 0 \ |
| 564 | }; \ |
| 565 | \ |
| 566 | static const gcipher_ops gops_##r##_ietf = { \ |
| 567 | &SALSA20_DECOR(salsa20, r, _ietf), \ |
| 568 | gencrypt_##r, gencrypt_##r, gdestroy, gsetiv_ietf, 0 \ |
| 569 | }; \ |
| 570 | \ |
| 571 | const gccipher SALSA20_DECOR(salsa20, r, ) = { \ |
| 572 | SALSA20_NAME_##r, salsa20_keysz, \ |
| 573 | SALSA20_NONCESZ, ginit_##r \ |
| 574 | }; \ |
| 575 | \ |
| 576 | const gccipher SALSA20_DECOR(salsa20, r, _ietf) = { \ |
| 577 | SALSA20_NAME_##r "-ietf", salsa20_keysz, \ |
| 578 | SALSA20_IETF_NONCESZ, ginit_##r##_ietf \ |
| 579 | }; |
| 580 | |
| 581 | SALSA20_VARS(DEFGCIPHER) |
| 582 | |
| 583 | #define DEFGXCIPHER(r) \ |
| 584 | \ |
| 585 | typedef struct { gcipher c; XSALSA20_CTX(r) ctx; } gxctx_##r; \ |
| 586 | \ |
| 587 | static void gxsetiv_##r(gcipher *c, const void *iv) \ |
| 588 | { gxctx_##r *g = (gxctx_##r *)c; XSALSA20_SETNONCE(r, &g->ctx, iv); } \ |
| 589 | \ |
| 590 | static void gxdestroy_##r(gcipher *c) \ |
| 591 | { gxctx_##r *g = (gxctx_##r *)c; BURN(*g); S_DESTROY(g); } \ |
| 592 | \ |
| 593 | static const gcipher_ops gxops_##r; \ |
| 594 | \ |
| 595 | static gcipher *gxinit_##r(const void *k, size_t sz) \ |
| 596 | { \ |
| 597 | gxctx_##r *g = S_CREATE(gxctx_##r); \ |
| 598 | g->c.ops = &gxops_##r; \ |
| 599 | XSALSA20_INIT(r, &g->ctx, k, sz, 0); \ |
| 600 | return (&g->c); \ |
| 601 | } \ |
| 602 | \ |
| 603 | static void gxencrypt_##r(gcipher *c, const void *s, \ |
| 604 | void *t, size_t sz) \ |
| 605 | { \ |
| 606 | gxctx_##r *g = (gxctx_##r *)c; \ |
| 607 | XSALSA20_ENCRYPT(r, &g->ctx, s, t, sz); \ |
| 608 | } \ |
| 609 | \ |
| 610 | static const gcipher_ops gxops_##r = { \ |
| 611 | &SALSA20_DECOR(xsalsa20, r, ), \ |
| 612 | gxencrypt_##r, gxencrypt_##r, gxdestroy_##r, gxsetiv_##r, 0 \ |
| 613 | }; \ |
| 614 | \ |
| 615 | const gccipher SALSA20_DECOR(xsalsa20, r, ) = { \ |
| 616 | "x" SALSA20_NAME_##r, salsa20_keysz, \ |
| 617 | XSALSA20_NONCESZ, gxinit_##r \ |
| 618 | }; |
| 619 | |
| 620 | SALSA20_VARS(DEFGXCIPHER) |
| 621 | |
| 622 | /*----- Generic random number generator interface -------------------------*/ |
| 623 | |
| 624 | typedef struct grops { |
| 625 | size_t noncesz; |
| 626 | void (*seek)(void *, kludge64); |
| 627 | kludge64 (*tell)(void *); |
| 628 | void (*setnonce)(void *, const void *); |
| 629 | void (*generate)(void *, void *, size_t); |
| 630 | } grops; |
| 631 | |
| 632 | typedef struct grbasectx { |
| 633 | grand r; |
| 634 | const grops *ops; |
| 635 | } grbasectx; |
| 636 | |
| 637 | static int grmisc(grand *r, unsigned op, ...) |
| 638 | { |
| 639 | octet buf[XSALSA20_NONCESZ]; |
| 640 | grbasectx *g = (grbasectx *)r; |
| 641 | grand *rr; |
| 642 | const octet *p; |
| 643 | size_t sz; |
| 644 | uint32 i; |
| 645 | unsigned long ul; |
| 646 | kludge64 pos; |
| 647 | va_list ap; |
| 648 | int rc = 0; |
| 649 | |
| 650 | va_start(ap, op); |
| 651 | |
| 652 | switch (op) { |
| 653 | case GRAND_CHECK: |
| 654 | switch (va_arg(ap, unsigned)) { |
| 655 | case GRAND_CHECK: |
| 656 | case GRAND_SEEDINT: |
| 657 | case GRAND_SEEDUINT32: |
| 658 | case GRAND_SEEDBLOCK: |
| 659 | case GRAND_SEEDRAND: |
| 660 | case SALSA20_SEEK: |
| 661 | case SALSA20_SEEKU64: |
| 662 | case SALSA20_TELL: |
| 663 | case SALSA20_TELLU64: |
| 664 | rc = 1; |
| 665 | break; |
| 666 | default: |
| 667 | rc = 0; |
| 668 | break; |
| 669 | } |
| 670 | break; |
| 671 | |
| 672 | case GRAND_SEEDINT: |
| 673 | i = va_arg(ap, unsigned); STORE32_L(buf, i); |
| 674 | memset(buf + 4, 0, g->ops->noncesz - 4); |
| 675 | g->ops->setnonce(g, buf); |
| 676 | break; |
| 677 | case GRAND_SEEDUINT32: |
| 678 | i = va_arg(ap, uint32); STORE32_L(buf, i); |
| 679 | memset(buf + 4, 0, g->ops->noncesz - 4); |
| 680 | g->ops->setnonce(g, buf); |
| 681 | break; |
| 682 | case GRAND_SEEDBLOCK: |
| 683 | p = va_arg(ap, const void *); |
| 684 | sz = va_arg(ap, size_t); |
| 685 | if (sz < g->ops->noncesz) { |
| 686 | memcpy(buf, p, sz); |
| 687 | memset(buf + sz, 0, g->ops->noncesz - sz); |
| 688 | p = buf; |
| 689 | } |
| 690 | g->ops->setnonce(g, p); |
| 691 | break; |
| 692 | case GRAND_SEEDRAND: |
| 693 | rr = va_arg(ap, grand *); |
| 694 | rr->ops->fill(rr, buf, g->ops->noncesz); |
| 695 | g->ops->setnonce(g, buf); |
| 696 | break; |
| 697 | case SALSA20_SEEK: |
| 698 | ul = va_arg(ap, unsigned long); ASSIGN64(pos, ul); |
| 699 | g->ops->seek(g, pos); |
| 700 | break; |
| 701 | case SALSA20_SEEKU64: |
| 702 | pos = va_arg(ap, kludge64); |
| 703 | g->ops->seek(g, pos); |
| 704 | break; |
| 705 | case SALSA20_TELL: |
| 706 | pos = g->ops->tell(g); |
| 707 | *va_arg(ap, unsigned long *) = GET64(unsigned long, pos); |
| 708 | break; |
| 709 | case SALSA20_TELLU64: |
| 710 | *va_arg(ap, kludge64 *) = g->ops->tell(g); |
| 711 | break; |
| 712 | default: |
| 713 | GRAND_BADOP; |
| 714 | break; |
| 715 | } |
| 716 | |
| 717 | return (rc); |
| 718 | } |
| 719 | |
| 720 | static octet grbyte(grand *r) |
| 721 | { |
| 722 | grbasectx *g = (grbasectx *)r; |
| 723 | octet o; |
| 724 | g->ops->generate(g, &o, 1); |
| 725 | return (o); |
| 726 | } |
| 727 | |
| 728 | static uint32 grword(grand *r) |
| 729 | { |
| 730 | grbasectx *g = (grbasectx *)r; |
| 731 | octet b[4]; |
| 732 | g->ops->generate(g, b, sizeof(b)); |
| 733 | return (LOAD32_L(b)); |
| 734 | } |
| 735 | |
| 736 | static void grfill(grand *r, void *p, size_t sz) |
| 737 | { |
| 738 | grbasectx *g = (grbasectx *)r; |
| 739 | g->ops->generate(r, p, sz); |
| 740 | } |
| 741 | |
| 742 | typedef struct grctx { |
| 743 | grbasectx r; |
| 744 | salsa20_ctx ctx; |
| 745 | } grctx; |
| 746 | |
| 747 | static void gr_seek(void *r, kludge64 pos) |
| 748 | { grctx *g = r; salsa20_seeku64(&g->ctx, pos); } |
| 749 | |
| 750 | static void gr_seek_ietf(void *r, kludge64 pos) |
| 751 | { grctx *g = r; salsa20_seek_ietf(&g->ctx, LO64(pos)); } |
| 752 | |
| 753 | static kludge64 gr_tell(void *r) |
| 754 | { grctx *g = r; return (salsa20_tellu64(&g->ctx)); } |
| 755 | |
| 756 | static kludge64 gr_tell_ietf(void *r) |
| 757 | { |
| 758 | grctx *g = r; |
| 759 | kludge64 pos; |
| 760 | |
| 761 | SET64(pos, 0, salsa20_tell_ietf(&g->ctx)); |
| 762 | return (pos); |
| 763 | } |
| 764 | |
| 765 | static void gr_setnonce(void *r, const void *n) |
| 766 | { grctx *g = r; salsa20_setnonce(&g->ctx, n); } |
| 767 | |
| 768 | static void gr_setnonce_ietf(void *r, const void *n) |
| 769 | { grctx *g = r; salsa20_setnonce(&g->ctx, n); } |
| 770 | |
| 771 | static void grdestroy(grand *r) |
| 772 | { grctx *g = (grctx *)r; BURN(*g); S_DESTROY(g); } |
| 773 | |
| 774 | static grand *grinit(const void *k, size_t ksz, const void *n, |
| 775 | const grand_ops *ops, const grops *myops) |
| 776 | { |
| 777 | grctx *g = S_CREATE(grctx); |
| 778 | g->r.r.ops = ops; |
| 779 | g->r.ops = myops; |
| 780 | salsa20_init(&g->ctx, k, ksz, 0); |
| 781 | if (n) myops->setnonce(g, n); |
| 782 | return (&g->r.r); |
| 783 | } |
| 784 | |
| 785 | #define DEFGRAND(rr) \ |
| 786 | \ |
| 787 | static void gr_generate_##rr(void *r, void *b, size_t sz) \ |
| 788 | { grctx *g = r; SALSA20_ENCRYPT(rr, &g->ctx, 0, b, sz); } \ |
| 789 | \ |
| 790 | static const grops grops_##rr = \ |
| 791 | { SALSA20_NONCESZ, gr_seek, gr_tell, \ |
| 792 | gr_setnonce, gr_generate_##rr }; \ |
| 793 | \ |
| 794 | static const grops grops_##rr##_ietf = \ |
| 795 | { SALSA20_IETF_NONCESZ, gr_seek_ietf, gr_tell_ietf, \ |
| 796 | gr_setnonce_ietf, gr_generate_##rr }; \ |
| 797 | \ |
| 798 | static const grand_ops grops_rand_##rr = { \ |
| 799 | SALSA20_NAME_##rr, GRAND_CRYPTO, 0, \ |
| 800 | grmisc, grdestroy, grword, \ |
| 801 | grbyte, grword, grand_defaultrange, grfill \ |
| 802 | }; \ |
| 803 | \ |
| 804 | static const grand_ops grops_rand_##rr##_ietf = { \ |
| 805 | SALSA20_NAME_##rr "-ietf", GRAND_CRYPTO, 0, \ |
| 806 | grmisc, grdestroy, grword, \ |
| 807 | grbyte, grword, grand_defaultrange, grfill \ |
| 808 | }; \ |
| 809 | \ |
| 810 | grand *SALSA20_DECOR(salsa20, rr, _rand) \ |
| 811 | (const void *k, size_t ksz, const void *n) \ |
| 812 | { return (grinit(k, ksz, n, &grops_rand_##rr, &grops_##rr)); } \ |
| 813 | \ |
| 814 | grand *SALSA20_DECOR(salsa20, rr, _ietf_rand) \ |
| 815 | (const void *k, size_t ksz, const void *n) \ |
| 816 | { \ |
| 817 | return (grinit(k, ksz, n, \ |
| 818 | &grops_rand_##rr##_ietf, \ |
| 819 | &grops_##rr##_ietf)); \ |
| 820 | } |
| 821 | |
| 822 | SALSA20_VARS(DEFGRAND) |
| 823 | |
| 824 | #define DEFXGRAND(rr) \ |
| 825 | \ |
| 826 | typedef struct grxctx_##rr { \ |
| 827 | grbasectx r; \ |
| 828 | XSALSA20_CTX(rr) ctx; \ |
| 829 | } grxctx_##rr; \ |
| 830 | \ |
| 831 | static void grx_seek_##rr(void *r, kludge64 pos) \ |
| 832 | { grxctx_##rr *g = r; XSALSA20_SEEKU64(rr, &g->ctx, pos); } \ |
| 833 | \ |
| 834 | static kludge64 grx_tell_##rr(void *r) \ |
| 835 | { grxctx_##rr *g = r; return (XSALSA20_TELLU64(rr, &g->ctx)); } \ |
| 836 | \ |
| 837 | static void grx_setnonce_##rr(void *r, const void *n) \ |
| 838 | { grxctx_##rr *g = r; XSALSA20_SETNONCE(rr, &g->ctx, n); } \ |
| 839 | \ |
| 840 | static void grxdestroy_##rr(grand *r) \ |
| 841 | { grxctx_##rr *g = (grxctx_##rr *)r; BURN(*g); S_DESTROY(g); } \ |
| 842 | \ |
| 843 | static void grx_generate_##rr(void *r, void *b, size_t sz) \ |
| 844 | { grxctx_##rr *g = r; XSALSA20_ENCRYPT(rr, &g->ctx, 0, b, sz); } \ |
| 845 | \ |
| 846 | static const grops grxops_##rr = \ |
| 847 | { XSALSA20_NONCESZ, grx_seek_##rr, grx_tell_##rr, \ |
| 848 | grx_setnonce_##rr, grx_generate_##rr }; \ |
| 849 | \ |
| 850 | static const grand_ops grxops_rand_##rr = { \ |
| 851 | "x" SALSA20_NAME_##rr, GRAND_CRYPTO, 0, \ |
| 852 | grmisc, grxdestroy_##rr, grword, \ |
| 853 | grbyte, grword, grand_defaultrange, grfill \ |
| 854 | }; \ |
| 855 | \ |
| 856 | grand *SALSA20_DECOR(xsalsa20, rr, _rand) \ |
| 857 | (const void *k, size_t ksz, const void *n) \ |
| 858 | { \ |
| 859 | grxctx_##rr *g = S_CREATE(grxctx_##rr); \ |
| 860 | g->r.r.ops = &grxops_rand_##rr; \ |
| 861 | g->r.ops = &grxops_##rr; \ |
| 862 | XSALSA20_INIT(rr, &g->ctx, k, ksz, n); \ |
| 863 | return (&g->r.r); \ |
| 864 | } |
| 865 | SALSA20_VARS(DEFXGRAND) |
| 866 | |
| 867 | /*----- Test rig ----------------------------------------------------------*/ |
| 868 | |
| 869 | #ifdef TEST_RIG |
| 870 | |
| 871 | #include <stdio.h> |
| 872 | #include <string.h> |
| 873 | |
| 874 | #include <mLib/macros.h> |
| 875 | #include <mLib/quis.h> |
| 876 | #include <mLib/testrig.h> |
| 877 | |
| 878 | #ifdef ENABLE_ASM_DEBUG |
| 879 | # include "regdump.h" |
| 880 | #endif |
| 881 | |
| 882 | static const int perm[] = { |
| 883 | 0, 13, 10, 7, |
| 884 | 4, 1, 14, 11, |
| 885 | 8, 5, 2, 15, |
| 886 | 12, 9, 6, 3 |
| 887 | }; |
| 888 | |
| 889 | #define DEFVCORE(r) \ |
| 890 | static int v_core_##r(dstr *v) \ |
| 891 | { \ |
| 892 | salsa20_matrix a, b; \ |
| 893 | dstr d = DSTR_INIT; \ |
| 894 | int i, j, n; \ |
| 895 | int ok = 1; \ |
| 896 | \ |
| 897 | DENSURE(&d, SALSA20_OUTSZ); d.len = SALSA20_OUTSZ; \ |
| 898 | n = *(int *)v[0].buf; \ |
| 899 | for (i = 0; i < SALSA20_OUTSZ/4; i++) \ |
| 900 | b[i] = LOAD32_L(v[1].buf + 4*i); \ |
| 901 | for (i = 0; i < n; i++) { \ |
| 902 | for (j = 0; j < 16; j++) a[perm[j]] = b[j]; \ |
| 903 | core(r, a, b); \ |
| 904 | memcpy(a, b, sizeof(a)); \ |
| 905 | } \ |
| 906 | for (i = 0; i < SALSA20_OUTSZ/4; i++) STORE32_L(d.buf + 4*i, b[i]); \ |
| 907 | \ |
| 908 | if (d.len != v[2].len || MEMCMP(d.buf, !=, v[2].buf, v[2].len)) { \ |
| 909 | ok = 0; \ |
| 910 | printf("\nfail core:" \ |
| 911 | "\n\titerations = %d" \ |
| 912 | "\n\tin = ", n); \ |
| 913 | type_hex.dump(&v[1], stdout); \ |
| 914 | printf("\n\texpected = "); \ |
| 915 | type_hex.dump(&v[2], stdout); \ |
| 916 | printf("\n\tcalculated = "); \ |
| 917 | type_hex.dump(&d, stdout); \ |
| 918 | putchar('\n'); \ |
| 919 | } \ |
| 920 | \ |
| 921 | dstr_destroy(&d); \ |
| 922 | return (ok); \ |
| 923 | } |
| 924 | SALSA20_VARS(DEFVCORE) |
| 925 | |
| 926 | #define SALSA20_CTX(r) salsa20_ctx |
| 927 | |
| 928 | #define SALSA20_TESTSETUP(r, ctx, k, ksz, n, nsz, p, psz) do { \ |
| 929 | kludge64 pos64; \ |
| 930 | salsa20_init(ctx, k, ksz, 0); \ |
| 931 | if (nsz == 8) salsa20_setnonce(ctx, n); \ |
| 932 | else if (nsz == 12) salsa20_setnonce_ietf(ctx, n); \ |
| 933 | if (psz == 8) { LOAD64_(pos64, p); salsa20_seeku64(ctx, pos64); } \ |
| 934 | else if (psz == 4) salsa20_seek_ietf(ctx, LOAD32(p)); \ |
| 935 | } while (0) |
| 936 | |
| 937 | #define XSALSA20_TESTSETUP(r, ctx, k, ksz, n, nsz, p, psz) do { \ |
| 938 | kludge64 pos64; \ |
| 939 | XSALSA20_INIT(r, ctx, k, ksz, 0); \ |
| 940 | if (nsz == 24) XSALSA20_SETNONCE(r, ctx, n); \ |
| 941 | if (psz == 8) { LOAD64_(pos64, p); XSALSA20_SEEKU64(r, ctx, pos64); } \ |
| 942 | } while (0) |
| 943 | |
| 944 | #define DEFxVENC(base, BASE, r) \ |
| 945 | static int v_encrypt_##base##_##r(dstr *v) \ |
| 946 | { \ |
| 947 | BASE##_CTX(r) ctx; \ |
| 948 | dstr d = DSTR_INIT; \ |
| 949 | const octet *p, *p0; \ |
| 950 | octet *q; \ |
| 951 | size_t sz, sz0, step; \ |
| 952 | unsigned long skip; \ |
| 953 | int ok = 1; \ |
| 954 | \ |
| 955 | if (v[4].len) { p0 = (const octet *)v[4].buf; sz0 = v[4].len; } \ |
| 956 | else { p0 = 0; sz0 = v[5].len; } \ |
| 957 | DENSURE(&d, sz0); d.len = sz0; \ |
| 958 | skip = *(unsigned long *)v[3].buf; \ |
| 959 | \ |
| 960 | step = 0; \ |
| 961 | while (step < sz0 + skip) { \ |
| 962 | step = step ? 3*step + 4 : 1; \ |
| 963 | if (step > sz0 + skip) step = sz0 + skip; \ |
| 964 | BASE##_TESTSETUP(r, &ctx, v[0].buf, v[0].len, \ |
| 965 | v[1].buf, v[1].len, v[2].buf, v[2].len); \ |
| 966 | \ |
| 967 | for (sz = skip; sz >= step; sz -= step) \ |
| 968 | BASE##_ENCRYPT(r, &ctx, 0, 0, step); \ |
| 969 | if (sz) BASE##_ENCRYPT(r, &ctx, 0, 0, sz); \ |
| 970 | for (p = p0, q = (octet *)d.buf, sz = sz0; \ |
| 971 | sz >= step; \ |
| 972 | sz -= step, q += step) { \ |
| 973 | BASE##_ENCRYPT(r, &ctx, p, q, step); \ |
| 974 | if (p) p += step; \ |
| 975 | } \ |
| 976 | if (sz) BASE##_ENCRYPT(r, &ctx, p, q, sz); \ |
| 977 | \ |
| 978 | if (d.len != v[5].len || MEMCMP(d.buf, !=, v[5].buf, v[5].len)) { \ |
| 979 | ok = 0; \ |
| 980 | printf("\nfail encrypt:" \ |
| 981 | "\n\tstep = %lu" \ |
| 982 | "\n\tkey = ", (unsigned long)step); \ |
| 983 | type_hex.dump(&v[0], stdout); \ |
| 984 | printf("\n\tnonce = "); \ |
| 985 | type_hex.dump(&v[1], stdout); \ |
| 986 | printf("\n\tposition = "); \ |
| 987 | type_hex.dump(&v[2], stdout); \ |
| 988 | printf("\n\tskip = %lu", skip); \ |
| 989 | printf("\n\tmessage = "); \ |
| 990 | type_hex.dump(&v[4], stdout); \ |
| 991 | printf("\n\texpected = "); \ |
| 992 | type_hex.dump(&v[5], stdout); \ |
| 993 | printf("\n\tcalculated = "); \ |
| 994 | type_hex.dump(&d, stdout); \ |
| 995 | putchar('\n'); \ |
| 996 | } \ |
| 997 | } \ |
| 998 | \ |
| 999 | dstr_destroy(&d); \ |
| 1000 | return (ok); \ |
| 1001 | } |
| 1002 | #define DEFVENC(r) DEFxVENC(salsa20, SALSA20, r) |
| 1003 | #define DEFXVENC(r) DEFxVENC(xsalsa20, XSALSA20, r) |
| 1004 | SALSA20_VARS(DEFVENC) |
| 1005 | SALSA20_VARS(DEFXVENC) |
| 1006 | |
| 1007 | static test_chunk defs[] = { |
| 1008 | #define DEFxTAB(pre, base, r) \ |
| 1009 | { pre SALSA20_NAME_##r, v_encrypt_##base##_##r, \ |
| 1010 | { &type_hex, &type_hex, &type_hex, &type_ulong, \ |
| 1011 | &type_hex, &type_hex, 0 } }, |
| 1012 | #define DEFTAB(r) \ |
| 1013 | { SALSA20_NAME_##r "-core", v_core_##r, \ |
| 1014 | { &type_int, &type_hex, &type_hex, 0 } }, \ |
| 1015 | DEFxTAB("", salsa20, r) |
| 1016 | #define DEFXTAB(r) DEFxTAB("x", xsalsa20, r) |
| 1017 | SALSA20_VARS(DEFTAB) |
| 1018 | SALSA20_VARS(DEFXTAB) |
| 1019 | { 0, 0, { 0 } } |
| 1020 | }; |
| 1021 | |
| 1022 | int main(int argc, char *argv[]) |
| 1023 | { |
| 1024 | #ifdef ENABLE_ASM_DEBUG |
| 1025 | regdump_init(); |
| 1026 | #endif |
| 1027 | test_run(argc, argv, defs, SRCDIR"/t/salsa20"); |
| 1028 | return (0); |
| 1029 | } |
| 1030 | |
| 1031 | #endif |
| 1032 | |
| 1033 | /*----- That's all, folks -------------------------------------------------*/ |