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