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"
46 /*----- Global variables --------------------------------------------------*/
48 const octet chacha_keysz
[] = { KSZ_SET
, 32, 16, 10, 0 };
50 /*----- The ChaCha core function and utilities ----------------------------*/
54 * Arguments: @unsigned r@ = number of rounds
55 * @const chacha_matrix src@ = input matrix
56 * @chacha_matrix dest@ = where to put the output
61 * Use: Apply the ChaCha/r core function to @src@, writing the
62 * result to @dest@. This consists of @r@ rounds followed by
63 * the feedforward step.
66 CPU_DISPATCH(static, (void), void, core
,
67 (unsigned r
, const chacha_matrix src
, chacha_matrix dest
),
68 (r
, src
, dest
), pick_core
, simple_core
);
70 static void simple_core(unsigned r
, const chacha_matrix src
,
72 { CHACHA_nR(dest
, src
, r
); CHACHA_FFWD(dest
, src
); }
74 #if CPUFAM_X86 || CPUFAM_AMD64
75 extern core__functype chacha_core_x86ish_sse2
;
76 extern core__functype chacha_core_x86ish_avx
;
80 extern core__functype chacha_core_arm_neon
;
84 extern core__functype chacha_core_arm64
;
87 static core__functype
*pick_core(void)
89 #if CPUFAM_X86 || CPUFAM_AMD64
90 DISPATCH_PICK_COND(chacha_core
, chacha_core_x86ish_avx
,
91 cpu_feature_p(CPUFEAT_X86_AVX
));
92 DISPATCH_PICK_COND(chacha_core
, chacha_core_x86ish_sse2
,
93 cpu_feature_p(CPUFEAT_X86_SSE2
));
96 DISPATCH_PICK_COND(chacha_core
, chacha_core_arm_neon
,
97 cpu_feature_p(CPUFEAT_ARM_NEON
));
100 DISPATCH_PICK_COND(chacha_core
, chacha_core_arm64
, 1);
102 DISPATCH_PICK_FALLBACK(chacha_core
, simple_core
);
105 /* --- @populate@ --- *
107 * Arguments: @chacha_matrix a@ = a matrix to fill in
108 * @const void *key@ = pointer to key material
109 * @size_t ksz@ = size of key
113 * Use: Fills in a ChaCha matrix from the key, setting the
114 * appropriate constants according to the key length. The nonce
115 * and position words are left uninitialized.
118 static void populate(chacha_matrix a
, const void *key
, size_t ksz
)
120 const octet
*k
= key
;
122 KSZ_ASSERT(chacha
, ksz
);
124 a
[ 4] = LOAD32_L(k
+ 0);
125 a
[ 5] = LOAD32_L(k
+ 4);
127 a
[ 6] = LOAD16_L(k
+ 8);
130 a
[ 6] = LOAD32_L(k
+ 8);
131 a
[ 7] = LOAD32_L(k
+ 12);
140 a
[ 2] = ksz
== 10 ? CHACHA_C80
: CHACHA_C128
;
143 a
[ 8] = LOAD32_L(k
+ 16);
144 a
[ 9] = LOAD32_L(k
+ 20);
145 a
[10] = LOAD32_L(k
+ 24);
146 a
[11] = LOAD32_L(k
+ 28);
154 /*----- ChaCha implementation ---------------------------------------------*/
156 /* --- @chacha_init@ --- *
158 * Arguments: @chacha_ctx *ctx@ = context to fill in
159 * @const void *key@ = pointer to key material
160 * @size_t ksz@ = size of key (either 32 or 16)
161 * @const void *nonce@ = initial nonce, or null
165 * Use: Initializes a ChaCha context ready for use.
168 void chacha_init(chacha_ctx
*ctx
, const void *key
, size_t ksz
,
171 static const octet zerononce
[CHACHA_NONCESZ
];
173 populate(ctx
->a
, key
, ksz
);
174 chacha_setnonce(ctx
, nonce ? nonce
: zerononce
);
177 /* --- @chacha_setnonce{,_ietf}@ --- *
179 * Arguments: @chacha_ctx *ctx@ = pointer to context
180 * @const void *nonce@ = the nonce (@CHACHA_NONCESZ@ or
181 * @CHACHA_IETF_NONCESZ@ bytes)
185 * Use: Set a new nonce in the context @ctx@, e.g., for processing a
186 * different message. The stream position is reset to zero (see
187 * @chacha_seek@ etc.).
190 void chacha_setnonce(chacha_ctx
*ctx
, const void *nonce
)
192 const octet
*n
= nonce
;
194 ctx
->a
[14] = LOAD32_L(n
+ 0);
195 ctx
->a
[15] = LOAD32_L(n
+ 4);
199 void chacha_setnonce_ietf(chacha_ctx
*ctx
, const void *nonce
)
201 const octet
*n
= nonce
;
203 ctx
->a
[13] = LOAD32_L(n
+ 0);
204 ctx
->a
[14] = LOAD32_L(n
+ 4);
205 ctx
->a
[15] = LOAD32_L(n
+ 8);
206 chacha_seek_ietf(ctx
, 0);
209 /* --- @chacha_seek{,u64,_ietf}@ --- *
211 * Arguments: @chacha_ctx *ctx@ = pointer to context
212 * @unsigned long i@, @kludge64 i@, @uint32 i@ = new position
216 * Use: Sets a new stream position, in units of Chacha output
217 * blocks, which are @CHACHA_OUTSZ@ bytes each. Byte
218 * granularity can be achieved by calling @chachaR_encrypt@
222 void chacha_seek(chacha_ctx
*ctx
, unsigned long i
)
223 { kludge64 ii
; ASSIGN64(ii
, i
); chacha_seeku64(ctx
, ii
); }
225 void chacha_seeku64(chacha_ctx
*ctx
, kludge64 i
)
227 ctx
->a
[12] = LO64(i
); ctx
->a
[13] = HI64(i
);
228 ctx
->off
= CHACHA_OUTSZ
;
231 void chacha_seek_ietf(chacha_ctx
*ctx
, uint32 i
)
234 /* --- @chacha_tell{,u64,_ietf}@ --- *
236 * Arguments: @chacha_ctx *ctx@ = pointer to context
238 * Returns: The current position in the output stream, in blocks,
242 unsigned long chacha_tell(chacha_ctx
*ctx
)
243 { kludge64 i
= chacha_tellu64(ctx
); return (GET64(unsigned long, i
)); }
245 kludge64
chacha_tellu64(chacha_ctx
*ctx
)
246 { kludge64 i
; SET64(i
, ctx
->a
[13], ctx
->a
[12]); return (i
); }
248 uint32
chacha_tell_ietf(chacha_ctx
*ctx
)
249 { return (ctx
->a
[12]); }
251 /* --- @chacha{20,12,8}_encrypt@ --- *
253 * Arguments: @chacha_ctx *ctx@ = pointer to context
254 * @const void *src@ = source buffer (or null)
255 * @void *dest@ = destination buffer (or null)
256 * @size_t sz@ = size of the buffers
260 * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@.
261 * ChaCha works by XORing plaintext with a keystream, so
262 * encryption and decryption are the same operation. If @dest@
263 * is null then ignore @src@ and skip @sz@ bytes of the
264 * keystream. If @src@ is null, then just write the keystream
268 static const rsvr_policy policy
= { 0, CHACHA_OUTSZ
, CHACHA_OUTSZ
};
270 #define CHACHA_ENCRYPT(r, ctx, src, dest, sz) \
271 chacha##r##_encrypt(ctx, src, dest, sz)
272 #define DEFENCRYPT(r) \
273 void CHACHA_ENCRYPT(r, chacha_ctx *ctx, const void *src, \
274 void *dest, size_t sz) \
277 const octet *s = src; \
280 kludge64 pos, delta; \
282 rsvr_mkplan(&plan, &policy, ctx->off, sz); \
286 core(r, ctx->a, b); CHACHA_STEP(ctx->a); \
287 SALSA20_PREPBUF(ctx, b); \
289 SALSA20_OUTBUF(ctx, d, s, plan.head); \
292 ctx->off -= plan.from_rsvr; \
295 if (plan.from_input) { \
296 pos = chacha_tellu64(ctx); \
297 ASSIGN64(delta, plan.from_input/SALSA20_OUTSZ); \
298 ADD64(pos, pos, delta); \
299 chacha_seeku64(ctx, pos); \
301 } else if (!s) while (plan.from_input) { \
302 core(r, ctx->a, b); CHACHA_STEP(ctx->a); \
303 SALSA20_GENFULL(b, d); plan.from_input -= CHACHA_OUTSZ; \
304 } else while (plan.from_input) { \
305 core(r, ctx->a, b); CHACHA_STEP(ctx->a); \
306 SALSA20_MIXFULL(b, d, s); plan.from_input -= CHACHA_OUTSZ; \
310 core(r, ctx->a, b); CHACHA_STEP(ctx->a); \
311 SALSA20_PREPBUF(ctx, b); \
312 SALSA20_OUTBUF(ctx, d, s, plan.tail); \
315 CHACHA_VARS(DEFENCRYPT
)
317 /*----- HChaCha implementation --------------------------------------------*/
319 #define HCHACHA_RAW(r, ctx, src, dest) hchacha##r##_raw(ctx, src, dest)
320 #define HCHACHA_PRF(r, ctx, src, dest) hchacha##r##_prf(ctx, src, dest)
322 /* --- @hchacha{20,12,8}_prf@ --- *
324 * Arguments: @chacha_ctx *ctx@ = pointer to context
325 * @const void *src@ = the input (@HCHACHA_INSZ@ bytes)
326 * @void *dest@ = the output (@HCHACHA_OUTSZ@ bytes)
330 * Use: Apply the HChacha/r pseudorandom function to @src@, writing
331 * the result to @out@.
334 #define DEFHCHACHA(r) \
335 static void HCHACHA_RAW(r, chacha_matrix k, \
336 const uint32 *src, uint32 *dest) \
341 /* --- HChaCha, computed from full ChaCha --- * \
343 * The security proof makes use of the fact that HChaCha (i.e., \
344 * without the final feedforward step) can be computed from full \
345 * ChaCha using only knowledge of the non-secret input. I don't \
346 * want to compromise the performance of the main function by \
347 * making the feedforward step separate, but this operation is less \
348 * speed critical, so we do it the harder way. \
351 for (i = 0; i < 4; i++) k[12 + i] = src[i]; \
353 for (i = 0; i < 8; i++) dest[i] = a[(i + 4)^4] - k[(i + 4)^4]; \
356 void HCHACHA_PRF(r, chacha_ctx *ctx, const void *src, void *dest) \
358 const octet *s = src; \
360 uint32 in[4], out[8]; \
363 for (i = 0; i < 4; i++) in[i] = LOAD32_L(s + 4*i); \
364 HCHACHA_RAW(r, ctx->a, in, out); \
365 for (i = 0; i < 8; i++) STORE32_L(d + 4*i, out[i]); \
367 CHACHA_VARS(DEFHCHACHA
)
369 /*----- XChaCha implementation -------------------------------------------*/
371 /* --- Some convenient macros for naming functions --- *
373 * Because the crypto core is involved in XChaCha/r's per-nonce setup, we
374 * need to take an interest in the number of rounds in most of the various
375 * functions, and it will probably help if we distinguish the context
376 * structures for the various versions.
379 #define XCHACHA_CTX(r) xchacha##r##_ctx
380 #define XCHACHA_INIT(r, ctx, k, ksz, n) xchacha##r##_init(ctx, k, ksz, n)
381 #define XCHACHA_SETNONCE(r, ctx, n) xchacha##r##_setnonce(ctx, n)
382 #define XCHACHA_SEEK(r, ctx, i) xchacha##r##_seek(ctx, i)
383 #define XCHACHA_SEEKU64(r, ctx, i) xchacha##r##_seeku64(ctx, i)
384 #define XCHACHA_TELL(r, ctx) xchacha##r##_tell(ctx)
385 #define XCHACHA_TELLU64(r, ctx) xchacha##r##_tellu64(ctx)
386 #define XCHACHA_ENCRYPT(r, ctx, src, dest, sz) \
387 xchacha##r##_encrypt(ctx, src, dest, sz)
389 /* --- @xchacha{20,12,8}_init@ --- *
391 * Arguments: @xchachaR_ctx *ctx@ = the context to fill in
392 * @const void *key@ = pointer to key material
393 * @size_t ksz@ = size of key (either 32 or 16)
394 * @const void *nonce@ = initial nonce, or null
398 * Use: Initializes an XChaCha/r context ready for use.
400 * There is a different function for each number of rounds,
401 * unlike for plain ChaCha.
404 #define DEFXINIT(r) \
405 void XCHACHA_INIT(r, XCHACHA_CTX(r) *ctx, \
406 const void *key, size_t ksz, const void *nonce) \
408 static const octet zerononce[XCHACHA_NONCESZ]; \
410 populate(ctx->k, key, ksz); \
411 ctx->s.a[ 0] = CHACHA_A256; \
412 ctx->s.a[ 1] = CHACHA_B256; \
413 ctx->s.a[ 2] = CHACHA_C256; \
414 ctx->s.a[ 3] = CHACHA_D256; \
415 XCHACHA_SETNONCE(r, ctx, nonce ? nonce : zerononce); \
417 CHACHA_VARS(DEFXINIT
)
419 /* --- @xchacha{20,12,8}_setnonce@ --- *
421 * Arguments: @xchachaR_ctx *ctx@ = pointer to context
422 * @const void *nonce@ = the nonce (@XCHACHA_NONCESZ@ bytes)
426 * Use: Set a new nonce in the context @ctx@, e.g., for processing a
427 * different message. The stream position is reset to zero (see
428 * @chacha_seek@ etc.).
430 * There is a different function for each number of rounds,
431 * unlike for plain ChaCha.
434 #define DEFXNONCE(r) \
435 void XCHACHA_SETNONCE(r, XCHACHA_CTX(r) *ctx, const void *nonce) \
437 const octet *n = nonce; \
441 for (i = 0; i < 4; i++) in[i] = LOAD32_L(n + 4*i); \
442 HCHACHA_RAW(r, ctx->k, in, ctx->s.a + 4); \
443 chacha_setnonce(&ctx->s, n + 16); \
445 CHACHA_VARS(DEFXNONCE
)
447 /* --- @xchacha{20,12,8}_seek{,u64}@ --- *
449 * Arguments: @xchachaR_ctx *ctx@ = pointer to context
450 * @unsigned long i@, @kludge64 i@ = new position to set
454 * Use: Sets a new stream position, in units of ChaCha output
455 * blocks, which are @XCHACHA_OUTSZ@ bytes each. Byte
456 * granularity can be achieved by calling @xchachaR_encrypt@
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}_tell{,u64}@ --- *
466 * Arguments: @chacha_ctx *ctx@ = pointer to context
468 * Returns: The current position in the output stream, in blocks,
471 * There is a different function for each number of rounds,
472 * unlike for plain ChaCha, because the context structures are
476 /* --- @xchacha{20,12,8}_encrypt@ --- *
478 * Arguments: @xchachaR_ctx *ctx@ = pointer to context
479 * @const void *src@ = source buffer (or null)
480 * @void *dest@ = destination buffer (or null)
481 * @size_t sz@ = size of the buffers
485 * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@.
486 * XChaCha works by XORing plaintext with a keystream, so
487 * encryption and decryption are the same operation. If @dest@
488 * is null then ignore @src@ and skip @sz@ bytes of the
489 * keystream. If @src@ is null, then just write the keystream
493 #define DEFXPASSTHRU(r) \
494 void XCHACHA_SEEK(r, XCHACHA_CTX(r) *ctx, unsigned long i) \
495 { chacha_seek(&ctx->s, i); } \
496 void XCHACHA_SEEKU64(r, XCHACHA_CTX(r) *ctx, kludge64 i) \
497 { chacha_seeku64(&ctx->s, i); } \
498 unsigned long XCHACHA_TELL(r, XCHACHA_CTX(r) *ctx) \
499 { return chacha_tell(&ctx->s); } \
500 kludge64 XCHACHA_TELLU64(r, XCHACHA_CTX(r) *ctx) \
501 { return chacha_tellu64(&ctx->s); } \
502 void XCHACHA_ENCRYPT(r, XCHACHA_CTX(r) *ctx, \
503 const void *src, void *dest, size_t sz) \
504 { CHACHA_ENCRYPT(r, &ctx->s, src, dest, sz); }
505 CHACHA_VARS(DEFXPASSTHRU
)
507 /*----- Generic cipher interface ------------------------------------------*/
509 typedef struct gctx
{ gcipher c
; chacha_ctx ctx
; } gctx
;
511 static void gsetiv(gcipher
*c
, const void *iv
)
512 { gctx
*g
= (gctx
*)c
; chacha_setnonce(&g
->ctx
, iv
); }
514 static void gsetiv_ietf(gcipher
*c
, const void *iv
)
515 { gctx
*g
= (gctx
*)c
; chacha_setnonce_ietf(&g
->ctx
, iv
); }
517 static void gdestroy(gcipher
*c
)
518 { gctx
*g
= (gctx
*)c
; BURN(*g
); S_DESTROY(g
); }
520 static gcipher
*ginit(const void *k
, size_t sz
, const gcipher_ops
*ops
)
522 gctx
*g
= S_CREATE(gctx
);
524 chacha_init(&g
->ctx
, k
, sz
, 0);
528 #define DEFGCIPHER(r) \
530 static const gcipher_ops gops_##r, gops_##r##_ietf; \
532 static gcipher *ginit_##r(const void *k, size_t sz) \
533 { return (ginit(k, sz, &gops_##r)); } \
535 static gcipher *ginit_##r##_ietf(const void *k, size_t sz) \
536 { return (ginit(k, sz, &gops_##r##_ietf)); } \
538 static void gencrypt_##r(gcipher *c, const void *s, \
539 void *t, size_t sz) \
540 { gctx *g = (gctx *)c; CHACHA_ENCRYPT(r, &g->ctx, s, t, sz); } \
542 static const gcipher_ops gops_##r = { \
544 gencrypt_##r, gencrypt_##r, gdestroy, gsetiv, 0 \
547 static const gcipher_ops gops_##r##_ietf = { \
549 gencrypt_##r, gencrypt_##r, gdestroy, gsetiv_ietf, 0 \
552 const gccipher chacha##r = { \
553 "chacha" #r, chacha_keysz, \
554 CHACHA_NONCESZ, ginit_##r \
557 const gccipher chacha##r##_ietf = { \
558 "chacha" #r "-ietf", chacha_keysz, \
559 CHACHA_IETF_NONCESZ, ginit_##r##_ietf \
562 CHACHA_VARS(DEFGCIPHER
)
564 #define DEFGXCIPHER(r) \
566 typedef struct { gcipher c; XCHACHA_CTX(r) ctx; } gxctx_##r; \
568 static void gxsetiv_##r(gcipher *c, const void *iv) \
569 { gxctx_##r *g = (gxctx_##r *)c; XCHACHA_SETNONCE(r, &g->ctx, iv); } \
571 static void gxdestroy_##r(gcipher *c) \
572 { gxctx_##r *g = (gxctx_##r *)c; BURN(*g); S_DESTROY(g); } \
574 static const gcipher_ops gxops_##r; \
576 static gcipher *gxinit_##r(const void *k, size_t sz) \
578 gxctx_##r *g = S_CREATE(gxctx_##r); \
579 g->c.ops = &gxops_##r; \
580 XCHACHA_INIT(r, &g->ctx, k, sz, 0); \
584 static void gxencrypt_##r(gcipher *c, const void *s, \
585 void *t, size_t sz) \
587 gxctx_##r *g = (gxctx_##r *)c; \
588 XCHACHA_ENCRYPT(r, &g->ctx, s, t, sz); \
591 static const gcipher_ops gxops_##r = { \
593 gxencrypt_##r, gxencrypt_##r, gxdestroy_##r, gxsetiv_##r, 0 \
596 const gccipher xchacha##r = { \
597 "xchacha" #r, chacha_keysz, \
598 CHACHA_NONCESZ, gxinit_##r \
601 CHACHA_VARS(DEFGXCIPHER
)
603 /*----- Generic random number generator interface -------------------------*/
605 typedef struct grops
{
607 void (*seek
)(void *, kludge64
);
608 kludge64 (*tell
)(void *);
609 void (*setnonce
)(void *, const void *);
610 void (*generate
)(void *, void *, size_t);
613 typedef struct grbasectx
{
618 static int grmisc(grand
*r
, unsigned op
, ...)
620 octet buf
[XCHACHA_NONCESZ
];
621 grbasectx
*g
= (grbasectx
*)r
;
635 switch (va_arg(ap
, unsigned)) {
638 case GRAND_SEEDUINT32
:
639 case GRAND_SEEDBLOCK
:
654 i
= va_arg(ap
, unsigned); STORE32_L(buf
, i
);
655 memset(buf
+ 4, 0, g
->ops
->noncesz
- 4);
656 g
->ops
->setnonce(g
, buf
);
658 case GRAND_SEEDUINT32
:
659 i
= va_arg(ap
, uint32
); STORE32_L(buf
, i
);
660 memset(buf
+ 4, 0, g
->ops
->noncesz
- 4);
661 g
->ops
->setnonce(g
, buf
);
663 case GRAND_SEEDBLOCK
:
664 p
= va_arg(ap
, const void *);
665 sz
= va_arg(ap
, size_t);
666 if (sz
< g
->ops
->noncesz
) {
668 memset(buf
+ sz
, 0, g
->ops
->noncesz
- sz
);
671 g
->ops
->setnonce(g
, p
);
674 rr
= va_arg(ap
, grand
*);
675 rr
->ops
->fill(rr
, buf
, g
->ops
->noncesz
);
676 g
->ops
->setnonce(g
, buf
);
679 ul
= va_arg(ap
, unsigned long); ASSIGN64(pos
, ul
);
680 g
->ops
->seek(g
, pos
);
683 pos
= va_arg(ap
, kludge64
);
684 g
->ops
->seek(g
, pos
);
687 pos
= g
->ops
->tell(g
);
688 *va_arg(ap
, unsigned long *) = GET64(unsigned long, pos
);
691 *va_arg(ap
, kludge64
*) = g
->ops
->tell(g
);
701 static octet
grbyte(grand
*r
)
703 grbasectx
*g
= (grbasectx
*)r
;
705 g
->ops
->generate(g
, &o
, 1);
709 static uint32
grword(grand
*r
)
711 grbasectx
*g
= (grbasectx
*)r
;
713 g
->ops
->generate(g
, b
, sizeof(b
));
714 return (LOAD32_L(b
));
717 static void grfill(grand
*r
, void *p
, size_t sz
)
719 grbasectx
*g
= (grbasectx
*)r
;
720 g
->ops
->generate(r
, p
, sz
);
723 typedef struct grctx
{
728 static void gr_seek(void *r
, kludge64 pos
)
729 { grctx
*g
= r
; chacha_seeku64(&g
->ctx
, pos
); }
731 static void gr_seek_ietf(void *r
, kludge64 pos
)
732 { grctx
*g
= r
; chacha_seek_ietf(&g
->ctx
, LO64(pos
)); }
734 static kludge64
gr_tell(void *r
)
735 { grctx
*g
= r
; return (chacha_tellu64(&g
->ctx
)); }
737 static kludge64
gr_tell_ietf(void *r
)
742 SET64(pos
, 0, chacha_tell_ietf(&g
->ctx
));
746 static void gr_setnonce(void *r
, const void *n
)
747 { grctx
*g
= r
; chacha_setnonce(&g
->ctx
, n
); }
749 static void gr_setnonce_ietf(void *r
, const void *n
)
750 { grctx
*g
= r
; chacha_setnonce_ietf(&g
->ctx
, n
); }
752 static void grdestroy(grand
*r
)
753 { grctx
*g
= (grctx
*)r
; BURN(*g
); S_DESTROY(g
); }
755 static grand
*grinit(const void *k
, size_t ksz
, const void *n
,
756 const grand_ops
*ops
, const grops
*myops
)
758 grctx
*g
= S_CREATE(grctx
);
761 chacha_init(&g
->ctx
, k
, ksz
, 0);
762 if (n
) myops
->setnonce(g
, n
);
766 #define DEFGRAND(rr) \
768 static void gr_generate_##rr(void *r, void *b, size_t sz) \
769 { grctx *g = r; CHACHA_ENCRYPT(rr, &g->ctx, 0, b, sz); } \
771 static const grops grops_##rr = \
772 { CHACHA_NONCESZ, gr_seek, gr_tell, \
773 gr_setnonce, gr_generate_##rr }; \
775 static const grops grops_##rr##_ietf = \
776 { CHACHA_IETF_NONCESZ, gr_seek_ietf, gr_tell_ietf, \
777 gr_setnonce_ietf, gr_generate_##rr }; \
779 static const grand_ops grops_rand_##rr = { \
780 "chacha" #rr, GRAND_CRYPTO, 0, \
781 grmisc, grdestroy, grword, \
782 grbyte, grword, grand_defaultrange, grfill \
785 static const grand_ops grops_rand_##rr##_ietf = { \
786 "chacha" #rr "-ietf", GRAND_CRYPTO, 0, \
787 grmisc, grdestroy, grword, \
788 grbyte, grword, grand_defaultrange, grfill \
791 grand *chacha##rr##_rand(const void *k, size_t ksz, const void *n) \
792 { return (grinit(k, ksz, n, &grops_rand_##rr, &grops_##rr)); } \
794 grand *chacha##rr##_ietf_rand(const void *k, size_t ksz, \
797 return (grinit(k, ksz, n, \
798 &grops_rand_##rr##_ietf, \
799 &grops_##rr##_ietf)); \
802 CHACHA_VARS(DEFGRAND
)
804 #define DEFXGRAND(rr) \
806 typedef struct grxctx_##rr { \
808 XCHACHA_CTX(rr) ctx; \
811 static void grx_seek_##rr(void *r, kludge64 pos) \
812 { grxctx_##rr *g = r; XCHACHA_SEEKU64(rr, &g->ctx, pos); } \
814 static kludge64 grx_tell_##rr(void *r) \
815 { grxctx_##rr *g = r; return (XCHACHA_TELLU64(rr, &g->ctx)); } \
817 static void grx_setnonce_##rr(void *r, const void *n) \
818 { grxctx_##rr *g = r; XCHACHA_SETNONCE(rr, &g->ctx, n); } \
820 static void grxdestroy_##rr(grand *r) \
821 { grxctx_##rr *g = (grxctx_##rr *)r; BURN(*g); S_DESTROY(g); } \
823 static void grx_generate_##rr(void *r, void *b, size_t sz) \
824 { grxctx_##rr *g = r; XCHACHA_ENCRYPT(rr, &g->ctx, 0, b, sz); } \
826 static const grops grxops_##rr = \
827 { XCHACHA_NONCESZ, grx_seek_##rr, grx_tell_##rr, \
828 grx_setnonce_##rr, grx_generate_##rr }; \
830 static const grand_ops grxops_rand_##rr = { \
831 "xchacha" #rr, GRAND_CRYPTO, 0, \
832 grmisc, grxdestroy_##rr, grword, \
833 grbyte, grword, grand_defaultrange, grfill \
836 grand *xchacha##rr##_rand(const void *k, size_t ksz, const void *n) \
838 grxctx_##rr *g = S_CREATE(grxctx_##rr); \
839 g->r.r.ops = &grxops_rand_##rr; \
840 g->r.ops = &grxops_##rr; \
841 XCHACHA_INIT(rr, &g->ctx, k, ksz, n); \
844 CHACHA_VARS(DEFXGRAND
)
846 /*----- Test rig ----------------------------------------------------------*/
853 #include <mLib/quis.h>
854 #include <mLib/testrig.h>
856 #define DEFVCORE(r) \
857 static int v_core_##r(dstr *v) \
859 chacha_matrix a, b; \
860 dstr d = DSTR_INIT; \
864 DENSURE(&d, CHACHA_OUTSZ); d.len = CHACHA_OUTSZ; \
865 n = *(int *)v[0].buf; \
866 for (i = 0; i < CHACHA_OUTSZ/4; i++) \
867 a[i] = LOAD32_L(v[1].buf + 4*i); \
868 for (i = 0; i < n; i++) { \
870 memcpy(a, b, sizeof(a)); \
872 for (i = 0; i < CHACHA_OUTSZ/4; i++) STORE32_L(d.buf + 4*i, a[i]); \
874 if (d.len != v[2].len || memcmp(d.buf, v[2].buf, v[2].len) != 0) { \
876 printf("\nfail core:" \
877 "\n\titerations = %d" \
879 type_hex.dump(&v[1], stdout); \
880 printf("\n\texpected = "); \
881 type_hex.dump(&v[2], stdout); \
882 printf("\n\tcalculated = "); \
883 type_hex.dump(&d, stdout); \
890 CHACHA_VARS(DEFVCORE
)
892 #define CHACHA_CTX(r) chacha_ctx
894 #define CHACHA_TESTSETUP(r, ctx, k, ksz, n, nsz, p, psz) do { \
896 chacha_init(ctx, k, ksz, 0); \
897 if (nsz == 8) chacha_setnonce(ctx, n); \
898 else if (nsz == 12) chacha_setnonce_ietf(ctx, n); \
899 if (psz == 8) { LOAD64_(pos64, p); chacha_seeku64(ctx, pos64); } \
900 else if (psz == 4) chacha_seek_ietf(ctx, LOAD32(p)); \
903 #define XCHACHA_TESTSETUP(r, ctx, k, ksz, n, nsz, p, psz) do { \
905 XCHACHA_INIT(r, ctx, k, ksz, 0); \
906 if (nsz == 24) XCHACHA_SETNONCE(r, ctx, n); \
907 if (psz == 8) { LOAD64_(pos64, p); xchacha##r##_seeku64(ctx, pos64); } \
910 #define DEFxVENC(base, BASE, r) \
911 static int v_encrypt_##base##_##r(dstr *v) \
914 dstr d = DSTR_INIT; \
915 const octet *p, *p0; \
917 size_t sz, sz0, step; \
918 unsigned long skip; \
921 if (v[4].len) { p0 = (const octet *)v[4].buf; sz0 = v[4].len; } \
922 else { p0 = 0; sz0 = v[5].len; } \
923 DENSURE(&d, sz0); d.len = sz0; \
924 skip = *(unsigned long *)v[3].buf; \
927 while (step < sz0 + skip) { \
928 step = step ? 3*step + 4 : 1; \
929 if (step > sz0 + skip) step = sz0 + skip; \
930 BASE##_TESTSETUP(r, &ctx, v[0].buf, v[0].len, \
931 v[1].buf, v[1].len, v[2].buf, v[2].len); \
933 for (sz = skip; sz >= step; sz -= step) \
934 BASE##_ENCRYPT(r, &ctx, 0, 0, step); \
935 if (sz) BASE##_ENCRYPT(r, &ctx, 0, 0, sz); \
936 for (p = p0, q = (octet *)d.buf, sz = sz0; \
938 sz -= step, q += step) { \
939 BASE##_ENCRYPT(r, &ctx, p, q, step); \
942 if (sz) BASE##_ENCRYPT(r, &ctx, p, q, sz); \
944 if (d.len != v[5].len || memcmp(d.buf, v[5].buf, v[5].len) != 0) { \
946 printf("\nfail encrypt:" \
948 "\n\tkey = ", (unsigned long)step); \
949 type_hex.dump(&v[0], stdout); \
950 printf("\n\tnonce = "); \
951 type_hex.dump(&v[1], stdout); \
952 printf("\n\tposition = "); \
953 type_hex.dump(&v[2], stdout); \
954 printf("\n\tskip = %lu", skip); \
955 printf("\n\tmessage = "); \
956 type_hex.dump(&v[4], stdout); \
957 printf("\n\texpected = "); \
958 type_hex.dump(&v[5], stdout); \
959 printf("\n\tcalculated = "); \
960 type_hex.dump(&d, stdout); \
968 #define DEFVENC(r) DEFxVENC(chacha, CHACHA, r)
969 #define DEFXVENC(r) DEFxVENC(xchacha, XCHACHA, r)
971 CHACHA_VARS(DEFXVENC
)
973 static test_chunk defs
[] = {
974 #define DEFxTAB(base, r) \
975 { #base #r, v_encrypt_##base##_##r, \
976 { &type_hex, &type_hex, &type_hex, &type_ulong, \
977 &type_hex, &type_hex, 0 } },
979 { "chacha" #r "-core", v_core_##r, \
980 { &type_int, &type_hex, &type_hex, 0 } }, \
982 #define DEFXTAB(r) DEFxTAB(xchacha, r)
988 int main(int argc
, char *argv
[])
990 test_run(argc
, argv
, defs
, SRCDIR
"/t/chacha");
996 /*----- That's all, folks -------------------------------------------------*/