5 * (c) 2015 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Catacomb.
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.
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.
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,
28 /*----- Header files ------------------------------------------------------*/
34 #include <mLib/bits.h>
38 #include "chacha-core.h"
45 /*----- Global variables --------------------------------------------------*/
47 const octet chacha_keysz[] = { KSZ_SET, 32, 16, 10, 0 };
49 /*----- The ChaCha core function and utilities ----------------------------*/
53 * Arguments: @unsigned r@ = number of rounds
54 * @const chacha_matrix src@ = input matrix
55 * @chacha_matrix dest@ = where to put the output
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.
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);
69 static void simple_core(unsigned r, const chacha_matrix src,
71 { CHACHA_nR(dest, src, r); CHACHA_FFWD(dest, src); }
73 #if CPUFAM_X86 || CPUFAM_AMD64
74 extern core__functype chacha_core_x86ish_sse2;
78 extern core__functype chacha_core_arm_neon;
81 static core__functype *pick_core(void)
83 #if CPUFAM_X86 || CPUFAM_AMD64
84 DISPATCH_PICK_COND(chacha_core, chacha_core_x86ish_sse2,
85 cpu_feature_p(CPUFEAT_X86_SSE2));
88 DISPATCH_PICK_COND(chacha_core, chacha_core_arm_neon,
89 cpu_feature_p(CPUFEAT_ARM_NEON));
91 DISPATCH_PICK_FALLBACK(chacha_core, simple_core);
94 /* --- @populate@ --- *
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
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.
107 static void populate(chacha_matrix a, const void *key, size_t ksz)
109 const octet *k = key;
111 KSZ_ASSERT(chacha, ksz);
113 a[ 4] = LOAD32_L(k + 0);
114 a[ 5] = LOAD32_L(k + 4);
116 a[ 6] = LOAD16_L(k + 8);
119 a[ 6] = LOAD32_L(k + 8);
120 a[ 7] = LOAD32_L(k + 12);
129 a[ 2] = ksz == 10 ? CHACHA_C80 : CHACHA_C128;
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);
143 /*----- ChaCha implementation ---------------------------------------------*/
145 /* --- @chacha_init@ --- *
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
154 * Use: Initializes a ChaCha context ready for use.
157 void chacha_init(chacha_ctx *ctx, const void *key, size_t ksz,
160 static const octet zerononce[CHACHA_NONCESZ];
162 populate(ctx->a, key, ksz);
163 chacha_setnonce(ctx, nonce ? nonce : zerononce);
166 /* --- @chacha_setnonce{,_ietf}@ --- *
168 * Arguments: @chacha_ctx *ctx@ = pointer to context
169 * @const void *nonce@ = the nonce (@CHACHA_NONCESZ@ or
170 * @CHACHA_IETF_NONCESZ@ bytes)
174 * Use: Set a new nonce in the context @ctx@, e.g., for processing a
175 * different message. The stream position is reset to zero (see
176 * @chacha_seek@ etc.).
179 void chacha_setnonce(chacha_ctx *ctx, const void *nonce)
181 const octet *n = nonce;
183 ctx->a[14] = LOAD32_L(n + 0);
184 ctx->a[15] = LOAD32_L(n + 4);
188 void chacha_setnonce_ietf(chacha_ctx *ctx, const void *nonce)
190 const octet *n = nonce;
192 ctx->a[13] = LOAD32_L(n + 0);
193 ctx->a[14] = LOAD32_L(n + 4);
194 ctx->a[15] = LOAD32_L(n + 8);
195 chacha_seek_ietf(ctx, 0);
198 /* --- @chacha_seek{,u64,_ietf}@ --- *
200 * Arguments: @chacha_ctx *ctx@ = pointer to context
201 * @unsigned long i@, @kludge64 i@, @uint32 i@ = new position
205 * Use: Sets a new stream position, in units of Chacha output
206 * blocks, which are @CHACHA_OUTSZ@ bytes each. Byte
207 * granularity can be achieved by calling @chachaR_encrypt@
211 void chacha_seek(chacha_ctx *ctx, unsigned long i)
212 { kludge64 ii; ASSIGN64(ii, i); chacha_seeku64(ctx, ii); }
214 void chacha_seeku64(chacha_ctx *ctx, kludge64 i)
216 ctx->a[12] = LO64(i); ctx->a[13] = HI64(i);
217 ctx->bufi = CHACHA_OUTSZ;
220 void chacha_seek_ietf(chacha_ctx *ctx, uint32 i)
223 /* --- @chacha_tell{,u64,_ietf}@ --- *
225 * Arguments: @chacha_ctx *ctx@ = pointer to context
227 * Returns: The current position in the output stream, in blocks,
231 unsigned long chacha_tell(chacha_ctx *ctx)
232 { kludge64 i = chacha_tellu64(ctx); return (GET64(unsigned long, i)); }
234 kludge64 chacha_tellu64(chacha_ctx *ctx)
235 { kludge64 i; SET64(i, ctx->a[13], ctx->a[12]); return (i); }
237 uint32 chacha_tell_ietf(chacha_ctx *ctx)
238 { return (ctx->a[12]); }
240 /* --- @chacha{20,12,8}_encrypt@ --- *
242 * Arguments: @chacha_ctx *ctx@ = pointer to context
243 * @const void *src@ = source buffer (or null)
244 * @void *dest@ = destination buffer (or null)
245 * @size_t sz@ = size of the buffers
249 * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@.
250 * ChaCha works by XORing plaintext with a keystream, so
251 * encryption and decryption are the same operation. If @dest@
252 * is null then ignore @src@ and skip @sz@ bytes of the
253 * keystream. If @src@ is null, then just write the keystream
257 #define CHACHA_ENCRYPT(r, ctx, src, dest, sz) \
258 chacha##r##_encrypt(ctx, src, dest, sz)
259 #define DEFENCRYPT(r) \
260 void CHACHA_ENCRYPT(r, chacha_ctx *ctx, const void *src, \
261 void *dest, size_t sz) \
264 const octet *s = src; \
267 kludge64 pos, delta; \
269 SALSA20_OUTBUF(ctx, d, s, sz); \
273 n = sz/CHACHA_OUTSZ; \
274 pos = chacha_tellu64(ctx); \
275 ASSIGN64(delta, n); \
276 ADD64(pos, pos, delta); \
277 chacha_seeku64(ctx, pos); \
278 sz = sz%CHACHA_OUTSZ; \
280 while (sz >= CHACHA_OUTSZ) { \
281 core(r, ctx->a, b); \
282 CHACHA_STEP(ctx->a); \
283 SALSA20_GENFULL(b, d); \
284 sz -= CHACHA_OUTSZ; \
287 while (sz >= CHACHA_OUTSZ) { \
288 core(r, ctx->a, b); \
289 CHACHA_STEP(ctx->a); \
290 SALSA20_MIXFULL(b, d, s); \
291 sz -= CHACHA_OUTSZ; \
296 core(r, ctx->a, b); \
297 CHACHA_STEP(ctx->a); \
298 SALSA20_PREPBUF(ctx, b); \
299 SALSA20_OUTBUF(ctx, d, s, sz); \
303 CHACHA_VARS(DEFENCRYPT)
305 /*----- HChaCha implementation --------------------------------------------*/
307 #define HCHACHA_RAW(r, ctx, src, dest) hchacha##r##_raw(ctx, src, dest)
308 #define HCHACHA_PRF(r, ctx, src, dest) hchacha##r##_prf(ctx, src, dest)
310 /* --- @hchacha{20,12,8}_prf@ --- *
312 * Arguments: @chacha_ctx *ctx@ = pointer to context
313 * @const void *src@ = the input (@HCHACHA_INSZ@ bytes)
314 * @void *dest@ = the output (@HCHACHA_OUTSZ@ bytes)
318 * Use: Apply the HChacha/r pseudorandom function to @src@, writing
319 * the result to @out@.
322 #define DEFHCHACHA(r) \
323 static void HCHACHA_RAW(r, chacha_matrix k, \
324 const uint32 *src, uint32 *dest) \
329 /* --- HChaCha, computed from full ChaCha --- * \
331 * The security proof makes use of the fact that HChaCha (i.e., \
332 * without the final feedforward step) can be computed from full \
333 * ChaCha using only knowledge of the non-secret input. I don't \
334 * want to compromise the performance of the main function by \
335 * making the feedforward step separate, but this operation is less \
336 * speed critical, so we do it the harder way. \
339 for (i = 0; i < 4; i++) k[12 + i] = src[i]; \
341 for (i = 0; i < 8; i++) dest[i] = a[(i + 4)^4] - k[(i + 4)^4]; \
344 void HCHACHA_PRF(r, chacha_ctx *ctx, const void *src, void *dest) \
346 const octet *s = src; \
348 uint32 in[4], out[8]; \
351 for (i = 0; i < 4; i++) in[i] = LOAD32_L(s + 4*i); \
352 HCHACHA_RAW(r, ctx->a, in, out); \
353 for (i = 0; i < 8; i++) STORE32_L(d + 4*i, out[i]); \
355 CHACHA_VARS(DEFHCHACHA)
357 /*----- XChaCha implementation -------------------------------------------*/
359 /* --- Some convenient macros for naming functions --- *
361 * Because the crypto core is involved in XChaCha/r's per-nonce setup, we
362 * need to take an interest in the number of rounds in most of the various
363 * functions, and it will probably help if we distinguish the context
364 * structures for the various versions.
367 #define XCHACHA_CTX(r) xchacha##r##_ctx
368 #define XCHACHA_INIT(r, ctx, k, ksz, n) xchacha##r##_init(ctx, k, ksz, n)
369 #define XCHACHA_SETNONCE(r, ctx, n) xchacha##r##_setnonce(ctx, n)
370 #define XCHACHA_SEEK(r, ctx, i) xchacha##r##_seek(ctx, i)
371 #define XCHACHA_SEEKU64(r, ctx, i) xchacha##r##_seeku64(ctx, i)
372 #define XCHACHA_TELL(r, ctx) xchacha##r##_tell(ctx)
373 #define XCHACHA_TELLU64(r, ctx) xchacha##r##_tellu64(ctx)
374 #define XCHACHA_ENCRYPT(r, ctx, src, dest, sz) \
375 xchacha##r##_encrypt(ctx, src, dest, sz)
377 /* --- @xchacha{20,12,8}_init@ --- *
379 * Arguments: @xchachaR_ctx *ctx@ = the context to fill in
380 * @const void *key@ = pointer to key material
381 * @size_t ksz@ = size of key (either 32 or 16)
382 * @const void *nonce@ = initial nonce, or null
386 * Use: Initializes an XChaCha/r context ready for use.
388 * There is a different function for each number of rounds,
389 * unlike for plain ChaCha.
392 #define DEFXINIT(r) \
393 void XCHACHA_INIT(r, XCHACHA_CTX(r) *ctx, \
394 const void *key, size_t ksz, const void *nonce) \
396 static const octet zerononce[XCHACHA_NONCESZ]; \
398 populate(ctx->k, key, ksz); \
399 ctx->s.a[ 0] = CHACHA_A256; \
400 ctx->s.a[ 1] = CHACHA_B256; \
401 ctx->s.a[ 2] = CHACHA_C256; \
402 ctx->s.a[ 3] = CHACHA_D256; \
403 XCHACHA_SETNONCE(r, ctx, nonce ? nonce : zerononce); \
405 CHACHA_VARS(DEFXINIT)
407 /* --- @xchacha{20,12,8}_setnonce@ --- *
409 * Arguments: @xchachaR_ctx *ctx@ = pointer to context
410 * @const void *nonce@ = the nonce (@XCHACHA_NONCESZ@ bytes)
414 * Use: Set a new nonce in the context @ctx@, e.g., for processing a
415 * different message. The stream position is reset to zero (see
416 * @chacha_seek@ etc.).
418 * There is a different function for each number of rounds,
419 * unlike for plain ChaCha.
422 #define DEFXNONCE(r) \
423 void XCHACHA_SETNONCE(r, XCHACHA_CTX(r) *ctx, const void *nonce) \
425 const octet *n = nonce; \
429 for (i = 0; i < 4; i++) in[i] = LOAD32_L(n + 4*i); \
430 HCHACHA_RAW(r, ctx->k, in, ctx->s.a + 4); \
431 chacha_setnonce(&ctx->s, n + 16); \
433 CHACHA_VARS(DEFXNONCE)
435 /* --- @xchacha{20,12,8}_seek{,u64}@ --- *
437 * Arguments: @xchachaR_ctx *ctx@ = pointer to context
438 * @unsigned long i@, @kludge64 i@ = new position to set
442 * Use: Sets a new stream position, in units of ChaCha output
443 * blocks, which are @XCHACHA_OUTSZ@ bytes each. Byte
444 * granularity can be achieved by calling @xchachaR_encrypt@
447 * There is a different function for each number of rounds,
448 * unlike for plain ChaCha, because the context structures are
452 /* --- @xchacha{20,12,8}_tell{,u64}@ --- *
454 * Arguments: @chacha_ctx *ctx@ = pointer to context
456 * Returns: The current position in the output stream, in blocks,
459 * There is a different function for each number of rounds,
460 * unlike for plain ChaCha, because the context structures are
464 /* --- @xchacha{20,12,8}_encrypt@ --- *
466 * Arguments: @xchachaR_ctx *ctx@ = pointer to context
467 * @const void *src@ = source buffer (or null)
468 * @void *dest@ = destination buffer (or null)
469 * @size_t sz@ = size of the buffers
473 * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@.
474 * XChaCha works by XORing plaintext with a keystream, so
475 * encryption and decryption are the same operation. If @dest@
476 * is null then ignore @src@ and skip @sz@ bytes of the
477 * keystream. If @src@ is null, then just write the keystream
481 #define DEFXPASSTHRU(r) \
482 void XCHACHA_SEEK(r, XCHACHA_CTX(r) *ctx, unsigned long i) \
483 { chacha_seek(&ctx->s, i); } \
484 void XCHACHA_SEEKU64(r, XCHACHA_CTX(r) *ctx, kludge64 i) \
485 { chacha_seeku64(&ctx->s, i); } \
486 unsigned long XCHACHA_TELL(r, XCHACHA_CTX(r) *ctx) \
487 { return chacha_tell(&ctx->s); } \
488 kludge64 XCHACHA_TELLU64(r, XCHACHA_CTX(r) *ctx) \
489 { return chacha_tellu64(&ctx->s); } \
490 void XCHACHA_ENCRYPT(r, XCHACHA_CTX(r) *ctx, \
491 const void *src, void *dest, size_t sz) \
492 { CHACHA_ENCRYPT(r, &ctx->s, src, dest, sz); }
493 CHACHA_VARS(DEFXPASSTHRU)
495 /*----- Generic cipher interface ------------------------------------------*/
497 typedef struct gctx { gcipher c; chacha_ctx ctx; } gctx;
499 static void gsetiv(gcipher *c, const void *iv)
500 { gctx *g = (gctx *)c; chacha_setnonce(&g->ctx, iv); }
502 static void gsetiv_ietf(gcipher *c, const void *iv)
503 { gctx *g = (gctx *)c; chacha_setnonce_ietf(&g->ctx, iv); }
505 static void gdestroy(gcipher *c)
506 { gctx *g = (gctx *)c; BURN(*g); S_DESTROY(g); }
508 static gcipher *ginit(const void *k, size_t sz, const gcipher_ops *ops)
510 gctx *g = S_CREATE(gctx);
512 chacha_init(&g->ctx, k, sz, 0);
516 #define DEFGCIPHER(r) \
518 static const gcipher_ops gops_##r, gops_##r##_ietf; \
520 static gcipher *ginit_##r(const void *k, size_t sz) \
521 { return (ginit(k, sz, &gops_##r)); } \
523 static gcipher *ginit_##r##_ietf(const void *k, size_t sz) \
524 { return (ginit(k, sz, &gops_##r##_ietf)); } \
526 static void gencrypt_##r(gcipher *c, const void *s, \
527 void *t, size_t sz) \
528 { gctx *g = (gctx *)c; CHACHA_ENCRYPT(r, &g->ctx, s, t, sz); } \
530 static const gcipher_ops gops_##r = { \
532 gencrypt_##r, gencrypt_##r, gdestroy, gsetiv, 0 \
535 static const gcipher_ops gops_##r##_ietf = { \
537 gencrypt_##r, gencrypt_##r, gdestroy, gsetiv_ietf, 0 \
540 const gccipher chacha##r = { \
541 "chacha" #r, chacha_keysz, \
542 CHACHA_NONCESZ, ginit_##r \
545 const gccipher chacha##r##_ietf = { \
546 "chacha" #r "-ietf", chacha_keysz, \
547 CHACHA_IETF_NONCESZ, ginit_##r##_ietf \
550 CHACHA_VARS(DEFGCIPHER)
552 #define DEFGXCIPHER(r) \
554 typedef struct { gcipher c; XCHACHA_CTX(r) ctx; } gxctx_##r; \
556 static void gxsetiv_##r(gcipher *c, const void *iv) \
557 { gxctx_##r *g = (gxctx_##r *)c; XCHACHA_SETNONCE(r, &g->ctx, iv); } \
559 static void gxdestroy_##r(gcipher *c) \
560 { gxctx_##r *g = (gxctx_##r *)c; BURN(*g); S_DESTROY(g); } \
562 static const gcipher_ops gxops_##r; \
564 static gcipher *gxinit_##r(const void *k, size_t sz) \
566 gxctx_##r *g = S_CREATE(gxctx_##r); \
567 g->c.ops = &gxops_##r; \
568 XCHACHA_INIT(r, &g->ctx, k, sz, 0); \
572 static void gxencrypt_##r(gcipher *c, const void *s, \
573 void *t, size_t sz) \
575 gxctx_##r *g = (gxctx_##r *)c; \
576 XCHACHA_ENCRYPT(r, &g->ctx, s, t, sz); \
579 static const gcipher_ops gxops_##r = { \
581 gxencrypt_##r, gxencrypt_##r, gxdestroy_##r, gxsetiv_##r, 0 \
584 const gccipher xchacha##r = { \
585 "xchacha" #r, chacha_keysz, \
586 CHACHA_NONCESZ, gxinit_##r \
589 CHACHA_VARS(DEFGXCIPHER)
591 /*----- Generic random number generator interface -------------------------*/
593 typedef struct grops {
595 void (*seek)(void *, kludge64);
596 kludge64 (*tell)(void *);
597 void (*setnonce)(void *, const void *);
598 void (*generate)(void *, void *, size_t);
601 typedef struct grbasectx {
606 static int grmisc(grand *r, unsigned op, ...)
608 octet buf[XCHACHA_NONCESZ];
609 grbasectx *g = (grbasectx *)r;
623 switch (va_arg(ap, unsigned)) {
626 case GRAND_SEEDUINT32:
627 case GRAND_SEEDBLOCK:
642 i = va_arg(ap, unsigned); STORE32_L(buf, i);
643 memset(buf + 4, 0, g->ops->noncesz - 4);
644 g->ops->setnonce(g, buf);
646 case GRAND_SEEDUINT32:
647 i = va_arg(ap, uint32); STORE32_L(buf, i);
648 memset(buf + 4, 0, g->ops->noncesz - 4);
649 g->ops->setnonce(g, buf);
651 case GRAND_SEEDBLOCK:
652 p = va_arg(ap, const void *);
653 sz = va_arg(ap, size_t);
654 if (sz < g->ops->noncesz) {
656 memset(buf + sz, 0, g->ops->noncesz - sz);
659 g->ops->setnonce(g, p);
662 rr = va_arg(ap, grand *);
663 rr->ops->fill(rr, buf, g->ops->noncesz);
664 g->ops->setnonce(g, buf);
667 ul = va_arg(ap, unsigned long); ASSIGN64(pos, ul);
668 g->ops->seek(g, pos);
671 pos = va_arg(ap, kludge64);
672 g->ops->seek(g, pos);
675 pos = g->ops->tell(g);
676 *va_arg(ap, unsigned long *) = GET64(unsigned long, pos);
679 *va_arg(ap, kludge64 *) = g->ops->tell(g);
689 static octet grbyte(grand *r)
691 grbasectx *g = (grbasectx *)r;
693 g->ops->generate(g, &o, 1);
697 static uint32 grword(grand *r)
699 grbasectx *g = (grbasectx *)r;
701 g->ops->generate(g, b, sizeof(b));
702 return (LOAD32_L(b));
705 static void grfill(grand *r, void *p, size_t sz)
707 grbasectx *g = (grbasectx *)r;
708 g->ops->generate(r, p, sz);
711 typedef struct grctx {
716 static void gr_seek(void *r, kludge64 pos)
717 { grctx *g = r; chacha_seeku64(&g->ctx, pos); }
719 static void gr_seek_ietf(void *r, kludge64 pos)
720 { grctx *g = r; chacha_seek_ietf(&g->ctx, LO64(pos)); }
722 static kludge64 gr_tell(void *r)
723 { grctx *g = r; return (chacha_tellu64(&g->ctx)); }
725 static kludge64 gr_tell_ietf(void *r)
730 SET64(pos, 0, chacha_tell_ietf(&g->ctx));
734 static void gr_setnonce(void *r, const void *n)
735 { grctx *g = r; chacha_setnonce(&g->ctx, n); }
737 static void gr_setnonce_ietf(void *r, const void *n)
738 { grctx *g = r; chacha_setnonce_ietf(&g->ctx, n); }
740 static void grdestroy(grand *r)
741 { grctx *g = (grctx *)r; BURN(*g); S_DESTROY(g); }
743 static grand *grinit(const void *k, size_t ksz, const void *n,
744 const grand_ops *ops, const grops *myops)
746 grctx *g = S_CREATE(grctx);
749 chacha_init(&g->ctx, k, ksz, 0);
750 if (n) myops->setnonce(g, n);
754 #define DEFGRAND(rr) \
756 static void gr_generate_##rr(void *r, void *b, size_t sz) \
757 { grctx *g = r; CHACHA_ENCRYPT(rr, &g->ctx, 0, b, sz); } \
759 static const grops grops_##rr = \
760 { CHACHA_NONCESZ, gr_seek, gr_tell, \
761 gr_setnonce, gr_generate_##rr }; \
763 static const grops grops_##rr##_ietf = \
764 { CHACHA_IETF_NONCESZ, gr_seek_ietf, gr_tell_ietf, \
765 gr_setnonce_ietf, gr_generate_##rr }; \
767 static const grand_ops grops_rand_##rr = { \
768 "chacha" #rr, GRAND_CRYPTO, 0, \
769 grmisc, grdestroy, grword, \
770 grbyte, grword, grand_defaultrange, grfill \
773 static const grand_ops grops_rand_##rr##_ietf = { \
774 "chacha" #rr "-ietf", GRAND_CRYPTO, 0, \
775 grmisc, grdestroy, grword, \
776 grbyte, grword, grand_defaultrange, grfill \
779 grand *chacha##rr##_rand(const void *k, size_t ksz, const void *n) \
780 { return (grinit(k, ksz, n, &grops_rand_##rr, &grops_##rr)); } \
782 grand *chacha##rr##_ietf_rand(const void *k, size_t ksz, \
785 return (grinit(k, ksz, n, \
786 &grops_rand_##rr##_ietf, \
787 &grops_##rr##_ietf)); \
790 CHACHA_VARS(DEFGRAND)
792 #define DEFXGRAND(rr) \
794 typedef struct grxctx_##rr { \
796 XCHACHA_CTX(rr) ctx; \
799 static void grx_seek_##rr(void *r, kludge64 pos) \
800 { grxctx_##rr *g = r; XCHACHA_SEEKU64(rr, &g->ctx, pos); } \
802 static kludge64 grx_tell_##rr(void *r) \
803 { grxctx_##rr *g = r; return (XCHACHA_TELLU64(rr, &g->ctx)); } \
805 static void grx_setnonce_##rr(void *r, const void *n) \
806 { grxctx_##rr *g = r; XCHACHA_SETNONCE(rr, &g->ctx, n); } \
808 static void grxdestroy_##rr(grand *r) \
809 { grxctx_##rr *g = (grxctx_##rr *)r; BURN(*g); S_DESTROY(g); } \
811 static void grx_generate_##rr(void *r, void *b, size_t sz) \
812 { grxctx_##rr *g = r; XCHACHA_ENCRYPT(rr, &g->ctx, 0, b, sz); } \
814 static const grops grxops_##rr = \
815 { XCHACHA_NONCESZ, grx_seek_##rr, grx_tell_##rr, \
816 grx_setnonce_##rr, grx_generate_##rr }; \
818 static const grand_ops grxops_rand_##rr = { \
819 "xchacha" #rr, GRAND_CRYPTO, 0, \
820 grmisc, grxdestroy_##rr, grword, \
821 grbyte, grword, grand_defaultrange, grfill \
824 grand *xchacha##rr##_rand(const void *k, size_t ksz, const void *n) \
826 grxctx_##rr *g = S_CREATE(grxctx_##rr); \
827 g->r.r.ops = &grxops_rand_##rr; \
828 g->r.ops = &grxops_##rr; \
829 XCHACHA_INIT(rr, &g->ctx, k, ksz, n); \
832 CHACHA_VARS(DEFXGRAND)
834 /*----- Test rig ----------------------------------------------------------*/
841 #include <mLib/quis.h>
842 #include <mLib/testrig.h>
844 #define DEFVCORE(r) \
845 static int v_core_##r(dstr *v) \
847 chacha_matrix a, b; \
848 dstr d = DSTR_INIT; \
852 DENSURE(&d, CHACHA_OUTSZ); d.len = CHACHA_OUTSZ; \
853 n = *(int *)v[0].buf; \
854 for (i = 0; i < CHACHA_OUTSZ/4; i++) \
855 a[i] = LOAD32_L(v[1].buf + 4*i); \
856 for (i = 0; i < n; i++) { \
858 memcpy(a, b, sizeof(a)); \
860 for (i = 0; i < CHACHA_OUTSZ/4; i++) STORE32_L(d.buf + 4*i, a[i]); \
862 if (d.len != v[2].len || memcmp(d.buf, v[2].buf, v[2].len) != 0) { \
864 printf("\nfail core:" \
865 "\n\titerations = %d" \
867 type_hex.dump(&v[1], stdout); \
868 printf("\n\texpected = "); \
869 type_hex.dump(&v[2], stdout); \
870 printf("\n\tcalculated = "); \
871 type_hex.dump(&d, stdout); \
878 CHACHA_VARS(DEFVCORE)
880 #define CHACHA_CTX(r) chacha_ctx
882 #define CHACHA_TESTSETUP(r, ctx, k, ksz, n, nsz, p, psz) do { \
884 chacha_init(ctx, k, ksz, 0); \
885 if (nsz == 8) chacha_setnonce(ctx, n); \
886 else if (nsz == 12) chacha_setnonce_ietf(ctx, n); \
887 if (psz == 8) { LOAD64_(pos64, p); chacha_seeku64(ctx, pos64); } \
888 else if (psz == 4) chacha_seek_ietf(ctx, LOAD32(p)); \
891 #define XCHACHA_TESTSETUP(r, ctx, k, ksz, n, nsz, p, psz) do { \
893 XCHACHA_INIT(r, ctx, k, ksz, 0); \
894 if (nsz == 24) XCHACHA_SETNONCE(r, ctx, n); \
895 if (psz == 8) { LOAD64_(pos64, p); xchacha##r##_seeku64(ctx, pos64); } \
898 #define DEFxVENC(base, BASE, r) \
899 static int v_encrypt_##base##_##r(dstr *v) \
902 dstr d = DSTR_INIT; \
903 const octet *p, *p0; \
905 size_t sz, sz0, step; \
906 unsigned long skip; \
909 if (v[4].len) { p0 = (const octet *)v[4].buf; sz0 = v[4].len; } \
910 else { p0 = 0; sz0 = v[5].len; } \
911 DENSURE(&d, sz0); d.len = sz0; \
912 skip = *(unsigned long *)v[3].buf; \
915 while (step < sz0 + skip) { \
916 step = step ? 3*step + 4 : 1; \
917 if (step > sz0 + skip) step = sz0 + skip; \
918 BASE##_TESTSETUP(r, &ctx, v[0].buf, v[0].len, \
919 v[1].buf, v[1].len, v[2].buf, v[2].len); \
921 for (sz = skip; sz >= step; sz -= step) \
922 BASE##_ENCRYPT(r, &ctx, 0, 0, step); \
923 if (sz) BASE##_ENCRYPT(r, &ctx, 0, 0, sz); \
924 for (p = p0, q = (octet *)d.buf, sz = sz0; \
926 sz -= step, q += step) { \
927 BASE##_ENCRYPT(r, &ctx, p, q, step); \
930 if (sz) BASE##_ENCRYPT(r, &ctx, p, q, sz); \
932 if (d.len != v[5].len || memcmp(d.buf, v[5].buf, v[5].len) != 0) { \
934 printf("\nfail encrypt:" \
936 "\n\tkey = ", (unsigned long)step); \
937 type_hex.dump(&v[0], stdout); \
938 printf("\n\tnonce = "); \
939 type_hex.dump(&v[1], stdout); \
940 printf("\n\tposition = "); \
941 type_hex.dump(&v[2], stdout); \
942 printf("\n\tskip = %lu", skip); \
943 printf("\n\tmessage = "); \
944 type_hex.dump(&v[4], stdout); \
945 printf("\n\texpected = "); \
946 type_hex.dump(&v[5], stdout); \
947 printf("\n\tcalculated = "); \
948 type_hex.dump(&d, stdout); \
956 #define DEFVENC(r) DEFxVENC(chacha, CHACHA, r)
957 #define DEFXVENC(r) DEFxVENC(xchacha, XCHACHA, r)
959 CHACHA_VARS(DEFXVENC)
961 static test_chunk defs[] = {
962 #define DEFxTAB(base, r) \
963 { #base #r, v_encrypt_##base##_##r, \
964 { &type_hex, &type_hex, &type_hex, &type_ulong, \
965 &type_hex, &type_hex, 0 } },
967 { "chacha" #r "-core", v_core_##r, \
968 { &type_int, &type_hex, &type_hex, 0 } }, \
970 #define DEFXTAB(r) DEFxTAB(xchacha, r)
976 int main(int argc, char *argv[])
978 test_run(argc, argv, defs, SRCDIR"/t/chacha");
984 /*----- That's all, folks -------------------------------------------------*/