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55d81656 MW |
1 | /* -*-c-*- |
2 | * | |
3 | * ChaCha 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 | ||
e10e6494 MW |
30 | #include "config.h" |
31 | ||
55d81656 MW |
32 | #include <stdarg.h> |
33 | ||
34 | #include <mLib/bits.h> | |
35 | ||
36 | #include "arena.h" | |
37 | #include "chacha.h" | |
38 | #include "chacha-core.h" | |
e10e6494 | 39 | #include "dispatch.h" |
55d81656 MW |
40 | #include "gcipher.h" |
41 | #include "grand.h" | |
42 | #include "keysz.h" | |
43 | #include "paranoia.h" | |
44 | ||
45 | /*----- Global variables --------------------------------------------------*/ | |
46 | ||
47 | const octet chacha_keysz[] = { KSZ_SET, 32, 16, 10, 0 }; | |
48 | ||
49 | /*----- The ChaCha core function and utilities ----------------------------*/ | |
50 | ||
51 | /* --- @core@ --- * | |
52 | * | |
53 | * Arguments: @unsigned r@ = number of rounds | |
54 | * @const chacha_matrix src@ = input matrix | |
55 | * @chacha_matrix dest@ = where to put the output | |
56 | * | |
57 | * Returns: --- | |
58 | * | |
59 | * | |
60 | * Use: Apply the ChaCha/r core function to @src@, writing the | |
61 | * result to @dest@. This consists of @r@ rounds followed by | |
62 | * the feedforward step. | |
63 | */ | |
64 | ||
8a1aa284 MW |
65 | CPU_DISPATCH(static, (void), void, core, |
66 | (unsigned r, const chacha_matrix src, chacha_matrix dest), | |
67 | (r, src, dest), pick_core, simple_core); | |
e10e6494 MW |
68 | |
69 | static void simple_core(unsigned r, const chacha_matrix src, | |
70 | chacha_matrix dest) | |
55d81656 MW |
71 | { CHACHA_nR(dest, src, r); CHACHA_FFWD(dest, src); } |
72 | ||
0f23f75f MW |
73 | #if CPUFAM_X86 || CPUFAM_AMD64 |
74 | extern core__functype chacha_core_x86ish_sse2; | |
e10e6494 MW |
75 | #endif |
76 | ||
704d59c8 MW |
77 | #if CPUFAM_ARMEL |
78 | extern core__functype chacha_core_arm_neon; | |
79 | #endif | |
80 | ||
e10e6494 MW |
81 | static core__functype *pick_core(void) |
82 | { | |
0f23f75f MW |
83 | #if CPUFAM_X86 || CPUFAM_AMD64 |
84 | DISPATCH_PICK_COND(chacha_core, chacha_core_x86ish_sse2, | |
fac645f7 | 85 | cpu_feature_p(CPUFEAT_X86_SSE2)); |
704d59c8 MW |
86 | #endif |
87 | #if CPUFAM_ARMEL | |
88 | DISPATCH_PICK_COND(chacha_core, chacha_core_arm_neon, | |
89 | cpu_feature_p(CPUFEAT_ARM_NEON)); | |
e10e6494 | 90 | #endif |
fac645f7 | 91 | DISPATCH_PICK_FALLBACK(chacha_core, simple_core); |
e10e6494 MW |
92 | } |
93 | ||
55d81656 MW |
94 | /* --- @populate@ --- * |
95 | * | |
96 | * Arguments: @chacha_matrix a@ = a matrix to fill in | |
97 | * @const void *key@ = pointer to key material | |
98 | * @size_t ksz@ = size of key | |
99 | * | |
100 | * Returns: --- | |
101 | * | |
102 | * Use: Fills in a ChaCha matrix from the key, setting the | |
103 | * appropriate constants according to the key length. The nonce | |
104 | * and position words are left uninitialized. | |
105 | */ | |
106 | ||
107 | static void populate(chacha_matrix a, const void *key, size_t ksz) | |
108 | { | |
109 | const octet *k = key; | |
110 | ||
111 | KSZ_ASSERT(chacha, ksz); | |
112 | ||
113 | a[ 4] = LOAD32_L(k + 0); | |
114 | a[ 5] = LOAD32_L(k + 4); | |
115 | if (ksz == 10) { | |
116 | a[ 6] = LOAD16_L(k + 8); | |
117 | a[ 7] = 0; | |
118 | } else { | |
119 | a[ 6] = LOAD32_L(k + 8); | |
120 | a[ 7] = LOAD32_L(k + 12); | |
121 | } | |
122 | if (ksz <= 16) { | |
123 | a[ 8] = a[ 4]; | |
124 | a[ 9] = a[ 5]; | |
125 | a[10] = a[ 6]; | |
126 | a[11] = a[ 7]; | |
127 | a[ 0] = CHACHA_A128; | |
128 | a[ 1] = CHACHA_B128; | |
129 | a[ 2] = ksz == 10 ? CHACHA_C80 : CHACHA_C128; | |
130 | a[ 3] = CHACHA_D128; | |
131 | } else { | |
132 | a[ 8] = LOAD32_L(k + 16); | |
133 | a[ 9] = LOAD32_L(k + 20); | |
134 | a[10] = LOAD32_L(k + 24); | |
135 | a[11] = LOAD32_L(k + 28); | |
136 | a[ 0] = CHACHA_A256; | |
137 | a[ 1] = CHACHA_B256; | |
138 | a[ 2] = CHACHA_C256; | |
139 | a[ 3] = CHACHA_D256; | |
140 | } | |
141 | } | |
142 | ||
143 | /*----- ChaCha implementation ---------------------------------------------*/ | |
144 | ||
145 | /* --- @chacha_init@ --- * | |
146 | * | |
147 | * Arguments: @chacha_ctx *ctx@ = context to fill in | |
148 | * @const void *key@ = pointer to key material | |
149 | * @size_t ksz@ = size of key (either 32 or 16) | |
150 | * @const void *nonce@ = initial nonce, or null | |
151 | * | |
152 | * Returns: --- | |
153 | * | |
154 | * Use: Initializes a ChaCha context ready for use. | |
155 | */ | |
156 | ||
157 | void chacha_init(chacha_ctx *ctx, const void *key, size_t ksz, | |
158 | const void *nonce) | |
159 | { | |
160 | static const octet zerononce[CHACHA_NONCESZ]; | |
161 | ||
162 | populate(ctx->a, key, ksz); | |
163 | chacha_setnonce(ctx, nonce ? nonce : zerononce); | |
164 | } | |
165 | ||
166 | /* --- @chacha_setnonce@ --- * | |
167 | * | |
168 | * Arguments: @chacha_ctx *ctx@ = pointer to context | |
169 | * @const void *nonce@ = the nonce (@CHACHA_NONCESZ@ bytes) | |
170 | * | |
171 | * Returns: --- | |
172 | * | |
173 | * Use: Set a new nonce in the context @ctx@, e.g., for processing a | |
174 | * different message. The stream position is reset to zero (see | |
175 | * @chacha_seek@ etc.). | |
176 | */ | |
177 | ||
178 | void chacha_setnonce(chacha_ctx *ctx, const void *nonce) | |
179 | { | |
180 | const octet *n = nonce; | |
181 | ||
182 | ctx->a[14] = LOAD32_L(n + 0); | |
183 | ctx->a[15] = LOAD32_L(n + 4); | |
184 | chacha_seek(ctx, 0); | |
185 | } | |
186 | ||
187 | /* --- @chacha_seek@, @chacha_seeku64@ --- * | |
188 | * | |
189 | * Arguments: @chacha_ctx *ctx@ = pointer to context | |
190 | * @unsigned long i@, @kludge64 i@ = new position to set | |
191 | * | |
192 | * Returns: --- | |
193 | * | |
194 | * Use: Sets a new stream position, in units of Chacha output | |
195 | * blocks, which are @CHACHA_OUTSZ@ bytes each. Byte | |
196 | * granularity can be achieved by calling @chachaR_encrypt@ | |
197 | * appropriately. | |
198 | */ | |
199 | ||
200 | void chacha_seek(chacha_ctx *ctx, unsigned long i) | |
201 | { kludge64 ii; ASSIGN64(ii, i); chacha_seeku64(ctx, ii); } | |
202 | ||
203 | void chacha_seeku64(chacha_ctx *ctx, kludge64 i) | |
204 | { | |
205 | ctx->a[12] = LO64(i); ctx->a[13] = HI64(i); | |
206 | ctx->bufi = CHACHA_OUTSZ; | |
207 | } | |
208 | ||
209 | /* --- @chacha_tell@, @chacha_tellu64@ --- * | |
210 | * | |
211 | * Arguments: @chacha_ctx *ctx@ = pointer to context | |
212 | * | |
213 | * Returns: The current position in the output stream, in blocks, | |
214 | * rounding upwards. | |
215 | */ | |
216 | ||
217 | unsigned long chacha_tell(chacha_ctx *ctx) | |
218 | { kludge64 i = chacha_tellu64(ctx); return (GET64(unsigned long, i)); } | |
219 | ||
220 | kludge64 chacha_tellu64(chacha_ctx *ctx) | |
221 | { kludge64 i; SET64(i, ctx->a[9], ctx->a[8]); return (i); } | |
222 | ||
223 | /* --- @chacha{,12,8}_encrypt@ --- * | |
224 | * | |
225 | * Arguments: @chacha_ctx *ctx@ = pointer to context | |
226 | * @const void *src@ = source buffer (or null) | |
227 | * @void *dest@ = destination buffer (or null) | |
228 | * @size_t sz@ = size of the buffers | |
229 | * | |
230 | * Returns: --- | |
231 | * | |
232 | * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@. | |
233 | * ChaCha works by XORing plaintext with a keystream, so | |
234 | * encryption and decryption are the same operation. If @dest@ | |
235 | * is null then ignore @src@ and skip @sz@ bytes of the | |
236 | * keystream. If @src@ is null, then just write the keystream | |
237 | * to @dest@. | |
238 | */ | |
239 | ||
240 | #define CHACHA_ENCRYPT(r, ctx, src, dest, sz) \ | |
241 | chacha##r##_encrypt(ctx, src, dest, sz) | |
242 | #define DEFENCRYPT(r) \ | |
243 | void CHACHA_ENCRYPT(r, chacha_ctx *ctx, const void *src, \ | |
244 | void *dest, size_t sz) \ | |
245 | { \ | |
246 | chacha_matrix b; \ | |
247 | const octet *s = src; \ | |
248 | octet *d = dest; \ | |
249 | size_t n; \ | |
250 | kludge64 pos, delta; \ | |
251 | \ | |
252 | SALSA20_OUTBUF(ctx, d, s, sz); \ | |
253 | if (!sz) return; \ | |
254 | \ | |
255 | if (!dest) { \ | |
256 | n = sz/CHACHA_OUTSZ; \ | |
257 | pos = chacha_tellu64(ctx); \ | |
258 | ASSIGN64(delta, n); \ | |
259 | ADD64(pos, pos, delta); \ | |
260 | chacha_seeku64(ctx, pos); \ | |
261 | sz = sz%CHACHA_OUTSZ; \ | |
262 | } else if (!src) { \ | |
263 | while (sz >= CHACHA_OUTSZ) { \ | |
264 | core(r, ctx->a, b); \ | |
265 | CHACHA_STEP(ctx->a); \ | |
266 | SALSA20_GENFULL(b, d); \ | |
267 | sz -= CHACHA_OUTSZ; \ | |
268 | } \ | |
269 | } else { \ | |
270 | while (sz >= CHACHA_OUTSZ) { \ | |
271 | core(r, ctx->a, b); \ | |
272 | CHACHA_STEP(ctx->a); \ | |
273 | SALSA20_MIXFULL(b, d, s); \ | |
274 | sz -= CHACHA_OUTSZ; \ | |
275 | } \ | |
276 | } \ | |
277 | \ | |
278 | if (sz) { \ | |
279 | core(r, ctx->a, b); \ | |
280 | CHACHA_STEP(ctx->a); \ | |
281 | SALSA20_PREPBUF(ctx, b); \ | |
282 | SALSA20_OUTBUF(ctx, d, s, sz); \ | |
283 | assert(!sz); \ | |
284 | } \ | |
285 | } | |
286 | CHACHA_VARS(DEFENCRYPT) | |
287 | ||
288 | /*----- HChaCha implementation --------------------------------------------*/ | |
289 | ||
290 | #define HCHACHA_RAW(r, ctx, src, dest) hchacha##r##_raw(ctx, src, dest) | |
291 | #define HCHACHA_PRF(r, ctx, src, dest) hchacha##r##_prf(ctx, src, dest) | |
292 | ||
293 | /* --- @hchacha{20,12,8}_prf@ --- * | |
294 | * | |
295 | * Arguments: @chacha_ctx *ctx@ = pointer to context | |
296 | * @const void *src@ = the input (@HCHACHA_INSZ@ bytes) | |
297 | * @void *dest@ = the output (@HCHACHA_OUTSZ@ bytes) | |
298 | * | |
299 | * Returns: --- | |
300 | * | |
301 | * Use: Apply the HChacha/r pseudorandom function to @src@, writing | |
302 | * the result to @out@. | |
303 | */ | |
304 | ||
305 | #define DEFHCHACHA(r) \ | |
306 | static void HCHACHA_RAW(r, chacha_matrix k, \ | |
307 | const uint32 *src, uint32 *dest) \ | |
308 | { \ | |
309 | chacha_matrix a; \ | |
310 | int i; \ | |
311 | \ | |
312 | /* --- HChaCha, computed from full ChaCha --- * \ | |
313 | * \ | |
314 | * The security proof makes use of the fact that HChaCha (i.e., \ | |
315 | * without the final feedforward step) can be computed from full \ | |
316 | * ChaCha using only knowledge of the non-secret input. I don't \ | |
317 | * want to compromise the performance of the main function by \ | |
318 | * making the feedforward step separate, but this operation is less \ | |
319 | * speed critical, so we do it the harder way. \ | |
320 | */ \ | |
321 | \ | |
322 | for (i = 0; i < 4; i++) k[12 + i] = src[i]; \ | |
323 | core(r, k, a); \ | |
324 | for (i = 0; i < 8; i++) dest[i] = a[(i + 4)^4] - k[(i + 4)^4]; \ | |
325 | } \ | |
326 | \ | |
327 | void HCHACHA_PRF(r, chacha_ctx *ctx, const void *src, void *dest) \ | |
328 | { \ | |
329 | const octet *s = src; \ | |
330 | octet *d = dest; \ | |
331 | uint32 in[4], out[8]; \ | |
332 | int i; \ | |
333 | \ | |
334 | for (i = 0; i < 4; i++) in[i] = LOAD32_L(s + 4*i); \ | |
335 | HCHACHA_RAW(r, ctx->a, in, out); \ | |
336 | for (i = 0; i < 8; i++) STORE32_L(d + 4*i, out[i]); \ | |
337 | } | |
338 | CHACHA_VARS(DEFHCHACHA) | |
339 | ||
340 | /*----- XChaCha implementation -------------------------------------------*/ | |
341 | ||
342 | /* --- Some convenient macros for naming functions --- * | |
343 | * | |
344 | * Because the crypto core is involved in XChaCha/r's per-nonce setup, we | |
345 | * need to take an interest in the number of rounds in most of the various | |
346 | * functions, and it will probably help if we distinguish the context | |
347 | * structures for the various versions. | |
348 | */ | |
349 | ||
350 | #define XCHACHA_CTX(r) xchacha##r##_ctx | |
351 | #define XCHACHA_INIT(r, ctx, k, ksz, n) xchacha##r##_init(ctx, k, ksz, n) | |
352 | #define XCHACHA_SETNONCE(r, ctx, n) xchacha##r##_setnonce(ctx, n) | |
353 | #define XCHACHA_SEEK(r, ctx, i) xchacha##r##_seek(ctx, i) | |
354 | #define XCHACHA_SEEKU64(r, ctx, i) xchacha##r##_seeku64(ctx, i) | |
355 | #define XCHACHA_TELL(r, ctx) xchacha##r##_tell(ctx) | |
356 | #define XCHACHA_TELLU64(r, ctx) xchacha##r##_tellu64(ctx) | |
357 | #define XCHACHA_ENCRYPT(r, ctx, src, dest, sz) \ | |
358 | xchacha##r##_encrypt(ctx, src, dest, sz) | |
359 | ||
360 | /* --- @xchacha{20,12,8}_init@ --- * | |
361 | * | |
362 | * Arguments: @xchachaR_ctx *ctx@ = the context to fill in | |
363 | * @const void *key@ = pointer to key material | |
364 | * @size_t ksz@ = size of key (either 32 or 16) | |
365 | * @const void *nonce@ = initial nonce, or null | |
366 | * | |
367 | * Returns: --- | |
368 | * | |
369 | * Use: Initializes an XChaCha/r context ready for use. | |
370 | * | |
371 | * There is a different function for each number of rounds, | |
372 | * unlike for plain ChaCha. | |
373 | */ | |
374 | ||
375 | #define DEFXINIT(r) \ | |
376 | void XCHACHA_INIT(r, XCHACHA_CTX(r) *ctx, \ | |
377 | const void *key, size_t ksz, const void *nonce) \ | |
378 | { \ | |
379 | static const octet zerononce[XCHACHA_NONCESZ]; \ | |
380 | \ | |
381 | populate(ctx->k, key, ksz); \ | |
382 | ctx->s.a[ 0] = CHACHA_A256; \ | |
383 | ctx->s.a[ 1] = CHACHA_B256; \ | |
384 | ctx->s.a[ 2] = CHACHA_C256; \ | |
385 | ctx->s.a[ 3] = CHACHA_D256; \ | |
386 | XCHACHA_SETNONCE(r, ctx, nonce ? nonce : zerononce); \ | |
387 | } | |
388 | CHACHA_VARS(DEFXINIT) | |
389 | ||
390 | /* --- @xchacha{20,12,8}_setnonce@ --- * | |
391 | * | |
392 | * Arguments: @xchachaR_ctx *ctx@ = pointer to context | |
393 | * @const void *nonce@ = the nonce (@XCHACHA_NONCESZ@ bytes) | |
394 | * | |
395 | * Returns: --- | |
396 | * | |
397 | * Use: Set a new nonce in the context @ctx@, e.g., for processing a | |
398 | * different message. The stream position is reset to zero (see | |
399 | * @chacha_seek@ etc.). | |
400 | * | |
401 | * There is a different function for each number of rounds, | |
402 | * unlike for plain ChaCha. | |
403 | */ | |
404 | ||
405 | #define DEFXNONCE(r) \ | |
406 | void XCHACHA_SETNONCE(r, XCHACHA_CTX(r) *ctx, const void *nonce) \ | |
407 | { \ | |
408 | const octet *n = nonce; \ | |
409 | uint32 in[4]; \ | |
410 | int i; \ | |
411 | \ | |
412 | for (i = 0; i < 4; i++) in[i] = LOAD32_L(n + 4*i); \ | |
413 | HCHACHA_RAW(r, ctx->k, in, ctx->s.a + 4); \ | |
414 | chacha_setnonce(&ctx->s, n + 16); \ | |
415 | } | |
416 | CHACHA_VARS(DEFXNONCE) | |
417 | ||
418 | /* --- @xchacha{20,12,8}_seek@, @xchacha{20,12,8}_seeku64@ --- * | |
419 | * | |
420 | * Arguments: @xchachaR_ctx *ctx@ = pointer to context | |
421 | * @unsigned long i@, @kludge64 i@ = new position to set | |
422 | * | |
423 | * Returns: --- | |
424 | * | |
425 | * Use: Sets a new stream position, in units of ChaCha output | |
426 | * blocks, which are @XCHACHA_OUTSZ@ bytes each. Byte | |
427 | * granularity can be achieved by calling @xchachaR_encrypt@ | |
428 | * appropriately. | |
429 | * | |
430 | * There is a different function for each number of rounds, | |
431 | * unlike for plain ChaCha, because the context structures are | |
432 | * different. | |
433 | */ | |
434 | ||
435 | /* --- @xchacha{20,12,8}_tell@, @xchacha{20,12,8}_tellu64@ --- * | |
436 | * | |
437 | * Arguments: @chacha_ctx *ctx@ = pointer to context | |
438 | * | |
439 | * Returns: The current position in the output stream, in blocks, | |
440 | * rounding upwards. | |
441 | * | |
442 | * There is a different function for each number of rounds, | |
443 | * unlike for plain ChaCha, because the context structures are | |
444 | * different. | |
445 | */ | |
446 | ||
447 | /* --- @xchacha{,12,8}_encrypt@ --- * | |
448 | * | |
449 | * Arguments: @xchachaR_ctx *ctx@ = pointer to context | |
450 | * @const void *src@ = source buffer (or null) | |
451 | * @void *dest@ = destination buffer (or null) | |
452 | * @size_t sz@ = size of the buffers | |
453 | * | |
454 | * Returns: --- | |
455 | * | |
456 | * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@. | |
457 | * XChaCha works by XORing plaintext with a keystream, so | |
458 | * encryption and decryption are the same operation. If @dest@ | |
459 | * is null then ignore @src@ and skip @sz@ bytes of the | |
460 | * keystream. If @src@ is null, then just write the keystream | |
461 | * to @dest@. | |
462 | */ | |
463 | ||
464 | #define DEFXPASSTHRU(r) \ | |
465 | void XCHACHA_SEEK(r, XCHACHA_CTX(r) *ctx, unsigned long i) \ | |
466 | { chacha_seek(&ctx->s, i); } \ | |
467 | void XCHACHA_SEEKU64(r, XCHACHA_CTX(r) *ctx, kludge64 i) \ | |
468 | { chacha_seeku64(&ctx->s, i); } \ | |
469 | unsigned long XCHACHA_TELL(r, XCHACHA_CTX(r) *ctx) \ | |
470 | { return chacha_tell(&ctx->s); } \ | |
471 | kludge64 XCHACHA_TELLU64(r, XCHACHA_CTX(r) *ctx) \ | |
472 | { return chacha_tellu64(&ctx->s); } \ | |
473 | void XCHACHA_ENCRYPT(r, XCHACHA_CTX(r) *ctx, \ | |
474 | const void *src, void *dest, size_t sz) \ | |
475 | { CHACHA_ENCRYPT(r, &ctx->s, src, dest, sz); } | |
476 | CHACHA_VARS(DEFXPASSTHRU) | |
477 | ||
478 | /*----- Generic cipher interface ------------------------------------------*/ | |
479 | ||
480 | typedef struct gctx { gcipher c; chacha_ctx ctx; } gctx; | |
481 | ||
482 | static void gsetiv(gcipher *c, const void *iv) | |
483 | { gctx *g = (gctx *)c; chacha_setnonce(&g->ctx, iv); } | |
484 | ||
485 | static void gdestroy(gcipher *c) | |
486 | { gctx *g = (gctx *)c; BURN(*g); S_DESTROY(g); } | |
487 | ||
488 | #define DEFGCIPHER(r) \ | |
489 | \ | |
490 | static const gcipher_ops gops_##r; \ | |
491 | \ | |
492 | static gcipher *ginit_##r(const void *k, size_t sz) \ | |
493 | { \ | |
494 | gctx *g = S_CREATE(gctx); \ | |
495 | g->c.ops = &gops_##r; \ | |
496 | chacha_init(&g->ctx, k, sz, 0); \ | |
497 | return (&g->c); \ | |
498 | } \ | |
499 | \ | |
500 | static void gencrypt_##r(gcipher *c, const void *s, \ | |
501 | void *t, size_t sz) \ | |
502 | { gctx *g = (gctx *)c; CHACHA_ENCRYPT(r, &g->ctx, s, t, sz); } \ | |
503 | \ | |
504 | static const gcipher_ops gops_##r = { \ | |
505 | &chacha##r, \ | |
506 | gencrypt_##r, gencrypt_##r, gdestroy, gsetiv, 0 \ | |
507 | }; \ | |
508 | \ | |
509 | const gccipher chacha##r = { \ | |
510 | "chacha" #r, chacha_keysz, \ | |
511 | CHACHA_NONCESZ, ginit_##r \ | |
512 | }; | |
513 | ||
514 | CHACHA_VARS(DEFGCIPHER) | |
515 | ||
516 | #define DEFGXCIPHER(r) \ | |
517 | \ | |
518 | typedef struct { gcipher c; XCHACHA_CTX(r) ctx; } gxctx_##r; \ | |
519 | \ | |
520 | static void gxsetiv_##r(gcipher *c, const void *iv) \ | |
521 | { gxctx_##r *g = (gxctx_##r *)c; XCHACHA_SETNONCE(r, &g->ctx, iv); } \ | |
522 | \ | |
523 | static void gxdestroy_##r(gcipher *c) \ | |
524 | { gxctx_##r *g = (gxctx_##r *)c; BURN(*g); S_DESTROY(g); } \ | |
525 | \ | |
526 | static const gcipher_ops gxops_##r; \ | |
527 | \ | |
528 | static gcipher *gxinit_##r(const void *k, size_t sz) \ | |
529 | { \ | |
530 | gxctx_##r *g = S_CREATE(gxctx_##r); \ | |
531 | g->c.ops = &gxops_##r; \ | |
532 | XCHACHA_INIT(r, &g->ctx, k, sz, 0); \ | |
533 | return (&g->c); \ | |
534 | } \ | |
535 | \ | |
536 | static void gxencrypt_##r(gcipher *c, const void *s, \ | |
537 | void *t, size_t sz) \ | |
538 | { \ | |
539 | gxctx_##r *g = (gxctx_##r *)c; \ | |
540 | XCHACHA_ENCRYPT(r, &g->ctx, s, t, sz); \ | |
541 | } \ | |
542 | \ | |
543 | static const gcipher_ops gxops_##r = { \ | |
544 | &xchacha##r, \ | |
545 | gxencrypt_##r, gxencrypt_##r, gxdestroy_##r, gxsetiv_##r, 0 \ | |
546 | }; \ | |
547 | \ | |
548 | const gccipher xchacha##r = { \ | |
549 | "xchacha" #r, chacha_keysz, \ | |
550 | CHACHA_NONCESZ, gxinit_##r \ | |
551 | }; | |
552 | ||
553 | CHACHA_VARS(DEFGXCIPHER) | |
554 | ||
555 | /*----- Generic random number generator interface -------------------------*/ | |
556 | ||
557 | typedef struct grops { | |
558 | size_t noncesz; | |
559 | void (*seek)(void *, kludge64); | |
560 | kludge64 (*tell)(void *); | |
561 | void (*setnonce)(void *, const void *); | |
562 | void (*generate)(void *, void *, size_t); | |
563 | } grops; | |
564 | ||
565 | typedef struct grbasectx { | |
566 | grand r; | |
567 | const grops *ops; | |
568 | } grbasectx; | |
569 | ||
570 | static int grmisc(grand *r, unsigned op, ...) | |
571 | { | |
572 | octet buf[XCHACHA_NONCESZ]; | |
573 | grbasectx *g = (grbasectx *)r; | |
574 | grand *rr; | |
575 | const octet *p; | |
576 | size_t sz; | |
577 | uint32 i; | |
578 | unsigned long ul; | |
579 | kludge64 pos; | |
580 | va_list ap; | |
581 | int rc = 0; | |
582 | ||
583 | va_start(ap, op); | |
584 | ||
585 | switch (op) { | |
586 | case GRAND_CHECK: | |
587 | switch (va_arg(ap, unsigned)) { | |
588 | case GRAND_CHECK: | |
589 | case GRAND_SEEDINT: | |
590 | case GRAND_SEEDUINT32: | |
591 | case GRAND_SEEDBLOCK: | |
592 | case GRAND_SEEDRAND: | |
593 | case CHACHA_SEEK: | |
594 | case CHACHA_SEEKU64: | |
595 | case CHACHA_TELL: | |
596 | case CHACHA_TELLU64: | |
597 | rc = 1; | |
598 | break; | |
599 | default: | |
600 | rc = 0; | |
601 | break; | |
602 | } | |
603 | break; | |
604 | ||
605 | case GRAND_SEEDINT: | |
606 | i = va_arg(ap, unsigned); STORE32_L(buf, i); | |
607 | memset(buf + 4, 0, g->ops->noncesz - 4); | |
608 | g->ops->setnonce(g, buf); | |
609 | break; | |
610 | case GRAND_SEEDUINT32: | |
611 | i = va_arg(ap, uint32); STORE32_L(buf, i); | |
612 | memset(buf + 4, 0, g->ops->noncesz - 4); | |
613 | g->ops->setnonce(g, buf); | |
614 | break; | |
615 | case GRAND_SEEDBLOCK: | |
616 | p = va_arg(ap, const void *); | |
617 | sz = va_arg(ap, size_t); | |
618 | if (sz < g->ops->noncesz) { | |
619 | memcpy(buf, p, sz); | |
620 | memset(buf + sz, 0, g->ops->noncesz - sz); | |
621 | p = buf; | |
622 | } | |
623 | g->ops->setnonce(g, p); | |
624 | break; | |
625 | case GRAND_SEEDRAND: | |
626 | rr = va_arg(ap, grand *); | |
627 | rr->ops->fill(rr, buf, g->ops->noncesz); | |
628 | g->ops->setnonce(g, buf); | |
629 | break; | |
630 | case CHACHA_SEEK: | |
631 | ul = va_arg(ap, unsigned long); ASSIGN64(pos, ul); | |
632 | g->ops->seek(g, pos); | |
633 | break; | |
634 | case CHACHA_SEEKU64: | |
635 | pos = va_arg(ap, kludge64); | |
636 | g->ops->seek(g, pos); | |
637 | break; | |
638 | case CHACHA_TELL: | |
639 | pos = g->ops->tell(g); | |
640 | *va_arg(ap, unsigned long *) = GET64(unsigned long, pos); | |
641 | break; | |
642 | case CHACHA_TELLU64: | |
643 | *va_arg(ap, kludge64 *) = g->ops->tell(g); | |
644 | break; | |
645 | default: | |
646 | GRAND_BADOP; | |
647 | break; | |
648 | } | |
649 | ||
650 | return (rc); | |
651 | } | |
652 | ||
653 | static octet grbyte(grand *r) | |
654 | { | |
655 | grbasectx *g = (grbasectx *)r; | |
656 | octet o; | |
657 | g->ops->generate(g, &o, 1); | |
658 | return (o); | |
659 | } | |
660 | ||
661 | static uint32 grword(grand *r) | |
662 | { | |
663 | grbasectx *g = (grbasectx *)r; | |
664 | octet b[4]; | |
665 | g->ops->generate(g, b, sizeof(b)); | |
666 | return (LOAD32_L(b)); | |
667 | } | |
668 | ||
669 | static void grfill(grand *r, void *p, size_t sz) | |
670 | { | |
671 | grbasectx *g = (grbasectx *)r; | |
672 | g->ops->generate(r, p, sz); | |
673 | } | |
674 | ||
675 | typedef struct grctx { | |
676 | grbasectx r; | |
677 | chacha_ctx ctx; | |
678 | } grctx; | |
679 | ||
680 | static void gr_seek(void *r, kludge64 pos) | |
681 | { grctx *g = r; chacha_seeku64(&g->ctx, pos); } | |
682 | ||
683 | static kludge64 gr_tell(void *r) | |
684 | { grctx *g = r; return (chacha_tellu64(&g->ctx)); } | |
685 | ||
686 | static void gr_setnonce(void *r, const void *n) | |
687 | { grctx *g = r; chacha_setnonce(&g->ctx, n); } | |
688 | ||
689 | static void grdestroy(grand *r) | |
690 | { grctx *g = (grctx *)r; BURN(*g); S_DESTROY(g); } | |
691 | ||
692 | #define DEFGRAND(rr) \ | |
693 | \ | |
694 | static void gr_generate_##rr(void *r, void *b, size_t sz) \ | |
695 | { grctx *g = r; CHACHA_ENCRYPT(rr, &g->ctx, 0, b, sz); } \ | |
696 | \ | |
697 | static const grops grops_##rr = \ | |
698 | { CHACHA_NONCESZ, gr_seek, gr_tell, \ | |
699 | gr_setnonce, gr_generate_##rr }; \ | |
700 | \ | |
701 | static const grand_ops grops_rand_##rr = { \ | |
702 | "chacha" #rr, GRAND_CRYPTO, 0, \ | |
703 | grmisc, grdestroy, grword, \ | |
44ff6c11 | 704 | grbyte, grword, grand_defaultrange, grfill \ |
55d81656 MW |
705 | }; \ |
706 | \ | |
707 | grand *chacha##rr##_rand(const void *k, size_t ksz, const void *n) \ | |
708 | { \ | |
709 | grctx *g = S_CREATE(g); \ | |
710 | g->r.r.ops = &grops_rand_##rr; \ | |
711 | g->r.ops = &grops_##rr; \ | |
712 | chacha_init(&g->ctx, k, ksz, n); \ | |
713 | return (&g->r.r); \ | |
714 | } | |
715 | CHACHA_VARS(DEFGRAND) | |
716 | ||
717 | #define DEFXGRAND(rr) \ | |
718 | \ | |
719 | typedef struct grxctx_##rr { \ | |
720 | grbasectx r; \ | |
721 | XCHACHA_CTX(rr) ctx; \ | |
722 | } grxctx_##rr; \ | |
723 | \ | |
724 | static void grx_seek_##rr(void *r, kludge64 pos) \ | |
725 | { grxctx_##rr *g = r; XCHACHA_SEEKU64(rr, &g->ctx, pos); } \ | |
726 | \ | |
727 | static kludge64 grx_tell_##rr(void *r) \ | |
728 | { grxctx_##rr *g = r; return (XCHACHA_TELLU64(rr, &g->ctx)); } \ | |
729 | \ | |
730 | static void grx_setnonce_##rr(void *r, const void *n) \ | |
731 | { grxctx_##rr *g = r; XCHACHA_SETNONCE(rr, &g->ctx, n); } \ | |
732 | \ | |
733 | static void grxdestroy_##rr(grand *r) \ | |
734 | { grxctx_##rr *g = (grxctx_##rr *)r; BURN(*g); S_DESTROY(g); } \ | |
735 | \ | |
736 | static void grx_generate_##rr(void *r, void *b, size_t sz) \ | |
737 | { grxctx_##rr *g = r; XCHACHA_ENCRYPT(rr, &g->ctx, 0, b, sz); } \ | |
738 | \ | |
739 | static const grops grxops_##rr = \ | |
740 | { XCHACHA_NONCESZ, grx_seek_##rr, grx_tell_##rr, \ | |
741 | grx_setnonce_##rr, grx_generate_##rr }; \ | |
742 | \ | |
743 | static const grand_ops grxops_rand_##rr = { \ | |
744 | "xchacha" #rr, GRAND_CRYPTO, 0, \ | |
745 | grmisc, grxdestroy_##rr, grword, \ | |
44ff6c11 | 746 | grbyte, grword, grand_defaultrange, grfill \ |
55d81656 MW |
747 | }; \ |
748 | \ | |
749 | grand *xchacha##rr##_rand(const void *k, size_t ksz, const void *n) \ | |
750 | { \ | |
751 | grxctx_##rr *g = S_CREATE(g); \ | |
752 | g->r.r.ops = &grxops_rand_##rr; \ | |
753 | g->r.ops = &grxops_##rr; \ | |
754 | XCHACHA_INIT(rr, &g->ctx, k, ksz, n); \ | |
755 | return (&g->r.r); \ | |
756 | } | |
757 | CHACHA_VARS(DEFXGRAND) | |
758 | ||
759 | /*----- Test rig ----------------------------------------------------------*/ | |
760 | ||
761 | #ifdef TEST_RIG | |
762 | ||
763 | #include <stdio.h> | |
764 | #include <string.h> | |
765 | ||
766 | #include <mLib/quis.h> | |
767 | #include <mLib/testrig.h> | |
768 | ||
769 | #define DEFVCORE(r) \ | |
770 | static int v_core_##r(dstr *v) \ | |
771 | { \ | |
772 | chacha_matrix a, b; \ | |
773 | dstr d = DSTR_INIT; \ | |
774 | int i, n; \ | |
775 | int ok = 1; \ | |
776 | \ | |
777 | DENSURE(&d, CHACHA_OUTSZ); d.len = CHACHA_OUTSZ; \ | |
778 | n = *(int *)v[0].buf; \ | |
779 | for (i = 0; i < CHACHA_OUTSZ/4; i++) \ | |
780 | a[i] = LOAD32_L(v[1].buf + 4*i); \ | |
781 | for (i = 0; i < n; i++) { \ | |
782 | core(r, a, b); \ | |
783 | memcpy(a, b, sizeof(a)); \ | |
784 | } \ | |
785 | for (i = 0; i < CHACHA_OUTSZ/4; i++) STORE32_L(d.buf + 4*i, a[i]); \ | |
786 | \ | |
787 | if (d.len != v[2].len || memcmp(d.buf, v[2].buf, v[2].len) != 0) { \ | |
788 | ok = 0; \ | |
789 | printf("\nfail core:" \ | |
790 | "\n\titerations = %d" \ | |
791 | "\n\tin = ", n); \ | |
792 | type_hex.dump(&v[1], stdout); \ | |
793 | printf("\n\texpected = "); \ | |
794 | type_hex.dump(&v[2], stdout); \ | |
795 | printf("\n\tcalculated = "); \ | |
796 | type_hex.dump(&d, stdout); \ | |
797 | putchar('\n'); \ | |
798 | } \ | |
799 | \ | |
800 | dstr_destroy(&d); \ | |
801 | return (ok); \ | |
802 | } | |
803 | CHACHA_VARS(DEFVCORE) | |
804 | ||
805 | #define CHACHA_CTX(r) chacha_ctx | |
806 | #define CHACHA_INIT(r, ctx, k, ksz, n) chacha_init(ctx, k, ksz, n) | |
807 | #define CHACHA_SEEKU64(r, ctx, i) chacha_seeku64(ctx, i) | |
808 | #define XCHACHA_SEEKU64(r, ctx, i) xchacha##r##_seeku64(ctx, i) | |
809 | ||
810 | #define DEFxVENC(base, BASE, r) \ | |
811 | static int v_encrypt_##base##_##r(dstr *v) \ | |
812 | { \ | |
813 | BASE##_CTX(r) ctx; \ | |
814 | dstr d = DSTR_INIT; \ | |
815 | kludge64 pos; \ | |
816 | const octet *p, *p0; \ | |
817 | octet *q; \ | |
818 | size_t sz, sz0, step; \ | |
819 | unsigned long skip; \ | |
820 | int ok = 1; \ | |
821 | \ | |
822 | if (v[4].len) { p0 = (const octet *)v[4].buf; sz0 = v[4].len; } \ | |
823 | else { p0 = 0; sz0 = v[5].len; } \ | |
824 | DENSURE(&d, sz0); d.len = sz0; \ | |
825 | skip = *(unsigned long *)v[3].buf; \ | |
826 | \ | |
827 | step = 0; \ | |
828 | while (step < sz0 + skip) { \ | |
829 | step = step ? 3*step + 4 : 1; \ | |
830 | if (step > sz0 + skip) step = sz0 + skip; \ | |
831 | BASE##_INIT(r, &ctx, v[0].buf, v[0].len, v[1].buf); \ | |
832 | if (v[2].len) { \ | |
833 | LOAD64_(pos, v[2].buf); \ | |
834 | BASE##_SEEKU64(r, &ctx, pos); \ | |
835 | } \ | |
836 | \ | |
837 | for (sz = skip; sz >= step; sz -= step) \ | |
838 | BASE##_ENCRYPT(r, &ctx, 0, 0, step); \ | |
839 | if (sz) BASE##_ENCRYPT(r, &ctx, 0, 0, sz); \ | |
840 | for (p = p0, q = (octet *)d.buf, sz = sz0; \ | |
841 | sz >= step; \ | |
842 | sz -= step, q += step) { \ | |
843 | BASE##_ENCRYPT(r, &ctx, p, q, step); \ | |
844 | if (p) p += step; \ | |
845 | } \ | |
846 | if (sz) BASE##_ENCRYPT(r, &ctx, p, q, sz); \ | |
847 | \ | |
848 | if (d.len != v[5].len || memcmp(d.buf, v[5].buf, v[5].len) != 0) { \ | |
849 | ok = 0; \ | |
850 | printf("\nfail encrypt:" \ | |
851 | "\n\tstep = %lu" \ | |
852 | "\n\tkey = ", (unsigned long)step); \ | |
853 | type_hex.dump(&v[0], stdout); \ | |
854 | printf("\n\tnonce = "); \ | |
855 | type_hex.dump(&v[1], stdout); \ | |
856 | printf("\n\tposition = "); \ | |
857 | type_hex.dump(&v[2], stdout); \ | |
858 | printf("\n\tskip = %lu", skip); \ | |
859 | printf("\n\tmessage = "); \ | |
860 | type_hex.dump(&v[4], stdout); \ | |
861 | printf("\n\texpected = "); \ | |
862 | type_hex.dump(&v[5], stdout); \ | |
863 | printf("\n\tcalculated = "); \ | |
864 | type_hex.dump(&d, stdout); \ | |
865 | putchar('\n'); \ | |
866 | } \ | |
867 | } \ | |
868 | \ | |
869 | dstr_destroy(&d); \ | |
870 | return (ok); \ | |
871 | } | |
872 | #define DEFVENC(r) DEFxVENC(chacha, CHACHA, r) | |
873 | #define DEFXVENC(r) DEFxVENC(xchacha, XCHACHA, r) | |
874 | CHACHA_VARS(DEFVENC) | |
875 | CHACHA_VARS(DEFXVENC) | |
876 | ||
877 | static test_chunk defs[] = { | |
878 | #define DEFxTAB(base, r) \ | |
879 | { #base #r, v_encrypt_##base##_##r, \ | |
880 | { &type_hex, &type_hex, &type_hex, &type_ulong, \ | |
881 | &type_hex, &type_hex, 0 } }, | |
882 | #define DEFTAB(r) \ | |
883 | { "chacha" #r "-core", v_core_##r, \ | |
884 | { &type_int, &type_hex, &type_hex, 0 } }, \ | |
885 | DEFxTAB(chacha, r) | |
886 | #define DEFXTAB(r) DEFxTAB(xchacha, r) | |
887 | CHACHA_VARS(DEFTAB) | |
888 | CHACHA_VARS(DEFXTAB) | |
889 | { 0, 0, { 0 } } | |
890 | }; | |
891 | ||
892 | int main(int argc, char *argv[]) | |
893 | { | |
894 | test_run(argc, argv, defs, SRCDIR"/t/chacha"); | |
895 | return (0); | |
896 | } | |
897 | ||
898 | #endif | |
899 | ||
900 | /*----- That's all, folks -------------------------------------------------*/ |