3 * Salsa20 stream cipher
5 * (c) 2015 Straylight/Edgeware
8 /*----- Header files ------------------------------------------------------*/
14 #include <mLib/bits.h>
23 #include "salsa20-core.h"
25 /*----- Global variables --------------------------------------------------*/
27 const octet salsa20_keysz
[] = { KSZ_SET
, 32, 16, 10, 0 };
29 /*----- The Salsa20 core function and utilities ---------------------------*/
33 * Arguments: @unsigned r@ = number of rounds
34 * @const salsa20_matrix src@ = input matrix
35 * @salsa20_matrix dest@ = where to put the output
40 * Use: Apply the Salsa20/r core function to @src@, writing the
41 * result to @dest@. This consists of @r@ rounds followed by
42 * the feedforward step.
45 CPU_DISPATCH(static, (void),
46 void, core
, (unsigned r
, const salsa20_matrix src
,
49 pick_core
, simple_core
);
51 static void simple_core(unsigned r
, const salsa20_matrix src
,
53 { SALSA20_nR(dest
, src
, r
); SALSA20_FFWD(dest
, src
); }
56 extern core__functype salsa20_core_x86_sse2
;
59 static core__functype
*pick_core(void)
62 if (cpu_feature_p(CPUFEAT_X86_SSE2
)) return salsa20_core_x86_sse2
;
67 /* --- @populate@ --- *
69 * Arguments: @salsa20_matrix a@ = a matrix to fill in
70 * @const void *key@ = pointer to key material
71 * @size_t ksz@ = size of key
75 * Use: Fills in a Salsa20 matrix from the key, setting the
76 * appropriate constants according to the key length. The nonce
77 * and position words are left uninitialized.
80 static void populate(salsa20_matrix a
, const void *key
, size_t ksz
)
84 KSZ_ASSERT(salsa20
, ksz
);
86 /* Here's the pattern of key, constant, nonce, and counter pieces in the
87 * matrix, before and after our permutation.
89 * [ C0 K0 K1 K2 ] [ C0 C1 C2 C3 ]
90 * [ K3 C1 N0 N1 ] --> [ K3 T1 K7 K2 ]
91 * [ T0 T1 C2 K4 ] [ T0 K6 K1 N1 ]
92 * [ K5 K6 K7 C3 ] [ K5 K0 N0 K4 ]
95 a
[13] = LOAD32_L(k
+ 0);
96 a
[10] = LOAD32_L(k
+ 4);
98 a
[ 7] = LOAD16_L(k
+ 8);
101 a
[ 7] = LOAD32_L(k
+ 8);
102 a
[ 4] = LOAD32_L(k
+ 12);
109 a
[ 0] = SALSA20_A128
;
110 a
[ 1] = SALSA20_B128
;
111 a
[ 2] = ksz
== 10 ? SALSA20_C80
: SALSA20_C128
;
112 a
[ 3] = SALSA20_D128
;
114 a
[15] = LOAD32_L(k
+ 16);
115 a
[12] = LOAD32_L(k
+ 20);
116 a
[ 9] = LOAD32_L(k
+ 24);
117 a
[ 6] = LOAD32_L(k
+ 28);
118 a
[ 0] = SALSA20_A256
;
119 a
[ 1] = SALSA20_B256
;
120 a
[ 2] = SALSA20_C256
;
121 a
[ 3] = SALSA20_D256
;
125 /*----- Salsa20 implementation --------------------------------------------*/
127 /* --- @salsa20_init@ --- *
129 * Arguments: @salsa20_ctx *ctx@ = context to fill in
130 * @const void *key@ = pointer to key material
131 * @size_t ksz@ = size of key (either 32 or 16)
132 * @const void *nonce@ = initial nonce, or null
136 * Use: Initializes a Salsa20 context ready for use.
139 void salsa20_init(salsa20_ctx
*ctx
, const void *key
, size_t ksz
,
142 static const octet zerononce
[SALSA20_NONCESZ
];
144 populate(ctx
->a
, key
, ksz
);
145 salsa20_setnonce(ctx
, nonce ? nonce
: zerononce
);
148 /* --- @salsa20_setnonce@ --- *
150 * Arguments: @salsa20_ctx *ctx@ = pointer to context
151 * @const void *nonce@ = the nonce (@SALSA20_NONCESZ@ bytes)
155 * Use: Set a new nonce in the context @ctx@, e.g., for processing a
156 * different message. The stream position is reset to zero (see
157 * @salsa20_seek@ etc.).
160 void salsa20_setnonce(salsa20_ctx
*ctx
, const void *nonce
)
162 const octet
*n
= nonce
;
164 ctx
->a
[14] = LOAD32_L(n
+ 0);
165 ctx
->a
[11] = LOAD32_L(n
+ 4);
166 salsa20_seek(ctx
, 0);
169 /* --- @salsa20_seek@, @salsa20_seeku64@ --- *
171 * Arguments: @salsa20_ctx *ctx@ = pointer to context
172 * @unsigned long i@, @kludge64 i@ = new position to set
176 * Use: Sets a new stream position, in units of Salsa20 output
177 * blocks, which are @SALSA20_OUTSZ@ bytes each. Byte
178 * granularity can be achieved by calling @salsa20R_encrypt@
182 void salsa20_seek(salsa20_ctx
*ctx
, unsigned long i
)
183 { kludge64 ii
; ASSIGN64(ii
, i
); salsa20_seeku64(ctx
, ii
); }
185 void salsa20_seeku64(salsa20_ctx
*ctx
, kludge64 i
)
187 ctx
->a
[8] = LO64(i
); ctx
->a
[5] = HI64(i
);
188 ctx
->bufi
= SALSA20_OUTSZ
;
191 /* --- @salsa20_tell@, @salsa20_tellu64@ --- *
193 * Arguments: @salsa20_ctx *ctx@ = pointer to context
195 * Returns: The current position in the output stream, in blocks,
199 unsigned long salsa20_tell(salsa20_ctx
*ctx
)
200 { kludge64 i
= salsa20_tellu64(ctx
); return (GET64(unsigned long, i
)); }
202 kludge64
salsa20_tellu64(salsa20_ctx
*ctx
)
203 { kludge64 i
; SET64(i
, ctx
->a
[5], ctx
->a
[8]); return (i
); }
205 /* --- @salsa20{,12,8}_encrypt@ --- *
207 * Arguments: @salsa20_ctx *ctx@ = pointer to context
208 * @const void *src@ = source buffer (or null)
209 * @void *dest@ = destination buffer (or null)
210 * @size_t sz@ = size of the buffers
214 * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@.
215 * Salsa20 works by XORing plaintext with a keystream, so
216 * encryption and decryption are the same operation. If @dest@
217 * is null then ignore @src@ and skip @sz@ bytes of the
218 * keystream. If @src@ is null, then just write the keystream
222 #define SALSA20_ENCRYPT(r, ctx, src, dest, sz) \
223 SALSA20_DECOR(salsa20, r, _encrypt)(ctx, src, dest, sz)
224 #define DEFENCRYPT(r) \
225 void SALSA20_ENCRYPT(r, salsa20_ctx *ctx, const void *src, \
226 void *dest, size_t sz) \
229 const octet *s = src; \
232 kludge64 pos, delta; \
234 SALSA20_OUTBUF(ctx, d, s, sz); \
238 n = sz/SALSA20_OUTSZ; \
239 pos = salsa20_tellu64(ctx); \
240 ASSIGN64(delta, n); \
241 ADD64(pos, pos, delta); \
242 salsa20_seeku64(ctx, pos); \
243 sz = sz%SALSA20_OUTSZ; \
245 while (sz >= SALSA20_OUTSZ) { \
246 core(r, ctx->a, b); \
247 SALSA20_STEP(ctx->a); \
248 SALSA20_GENFULL(b, d); \
249 sz -= SALSA20_OUTSZ; \
252 while (sz >= SALSA20_OUTSZ) { \
253 core(r, ctx->a, b); \
254 SALSA20_STEP(ctx->a); \
255 SALSA20_MIXFULL(b, d, s); \
256 sz -= SALSA20_OUTSZ; \
261 core(r, ctx->a, b); \
262 SALSA20_STEP(ctx->a); \
263 SALSA20_PREPBUF(ctx, b); \
264 SALSA20_OUTBUF(ctx, d, s, sz); \
268 SALSA20_VARS(DEFENCRYPT
)
270 /*----- HSalsa20 implementation -------------------------------------------*/
272 #define HSALSA20_RAW(r, ctx, src, dest) \
273 SALSA20_DECOR(hsalsa20, r, _raw)(ctx, src, dest)
274 #define HSALSA20_PRF(r, ctx, src, dest) \
275 SALSA20_DECOR(hsalsa20, r, _prf)(ctx, src, dest)
277 /* --- @hsalsa20{,12,8}_prf@ --- *
279 * Arguments: @salsa20_ctx *ctx@ = pointer to context
280 * @const void *src@ = the input (@HSALSA20_INSZ@ bytes)
281 * @void *dest@ = the output (@HSALSA20_OUTSZ@ bytes)
285 * Use: Apply the HSalsa20/r pseudorandom function to @src@, writing
286 * the result to @out@.
289 #define DEFHSALSA20(r) \
290 static void HSALSA20_RAW(r, salsa20_matrix k, \
291 const uint32 *src, uint32 *dest) \
296 /* --- HSalsa20, computed from full Salsa20 --- * \
298 * The security proof makes use of the fact that HSalsa20 (i.e., \
299 * without the final feedforward step) can be computed from full \
300 * Salsa20 using only knowledge of the non-secret input. I don't \
301 * want to compromise the performance of the main function by \
302 * making the feedforward step separate, but this operation is less \
303 * speed critical, so we do it the harder way. \
306 for (i = 0; i < 4; i++) k[14 - 3*i] = src[i]; \
308 for (i = 0; i < 4; i++) dest[i] = a[5*i] - k[i]; \
309 for (i = 4; i < 8; i++) dest[i] = a[i + 2] - k[26 - 3*i]; \
312 void HSALSA20_PRF(r, salsa20_ctx *ctx, const void *src, void *dest) \
314 const octet *s = src; \
316 uint32 in[4], out[8]; \
319 for (i = 0; i < 4; i++) in[i] = LOAD32_L(s + 4*i); \
320 HSALSA20_RAW(r, ctx->a, in, out); \
321 for (i = 0; i < 8; i++) STORE32_L(d + 4*i, out[i]); \
323 SALSA20_VARS(DEFHSALSA20
)
325 /*----- XSalsa20 implementation -------------------------------------------*/
327 /* --- Some convenient macros for naming functions --- *
329 * Because the crypto core is involved in XSalsa20/r's per-nonce setup, we
330 * need to take an interest in the number of rounds in most of the various
331 * functions, and it will probably help if we distinguish the context
332 * structures for the various versions.
335 #define XSALSA20_CTX(r) SALSA20_DECOR(xsalsa20, r, _ctx)
336 #define XSALSA20_INIT(r, ctx, k, ksz, n) \
337 SALSA20_DECOR(xsalsa20, r, _init)(ctx, k, ksz, n)
338 #define XSALSA20_SETNONCE(r, ctx, n) \
339 SALSA20_DECOR(xsalsa20, r, _setnonce)(ctx, n)
340 #define XSALSA20_SEEK(r, ctx, i) \
341 SALSA20_DECOR(xsalsa20, r, _seek)(ctx, i)
342 #define XSALSA20_SEEKU64(r, ctx, i) \
343 SALSA20_DECOR(xsalsa20, r, _seeku64)(ctx, i)
344 #define XSALSA20_TELL(r, ctx) \
345 SALSA20_DECOR(xsalsa20, r, _tell)(ctx)
346 #define XSALSA20_TELLU64(r, ctx) \
347 SALSA20_DECOR(xsalsa20, r, _tellu64)(ctx)
348 #define XSALSA20_ENCRYPT(r, ctx, src, dest, sz) \
349 SALSA20_DECOR(xsalsa20, r, _encrypt)(ctx, src, dest, sz)
351 /* --- @xsalsa20{,12,8}_init@ --- *
353 * Arguments: @xsalsa20R_ctx *ctx@ = the context to fill in
354 * @const void *key@ = pointer to key material
355 * @size_t ksz@ = size of key (either 32 or 16)
356 * @const void *nonce@ = initial nonce, or null
360 * Use: Initializes an XSalsa20/r context ready for use.
362 * There is a different function for each number of rounds,
363 * unlike for plain Salsa20.
366 #define DEFXINIT(r) \
367 void XSALSA20_INIT(r, XSALSA20_CTX(r) *ctx, \
368 const void *key, size_t ksz, const void *nonce) \
370 static const octet zerononce[XSALSA20_NONCESZ]; \
372 populate(ctx->k, key, ksz); \
373 ctx->s.a[ 0] = SALSA20_A256; \
374 ctx->s.a[ 1] = SALSA20_B256; \
375 ctx->s.a[ 2] = SALSA20_C256; \
376 ctx->s.a[ 3] = SALSA20_D256; \
377 XSALSA20_SETNONCE(r, ctx, nonce ? nonce : zerononce); \
379 SALSA20_VARS(DEFXINIT
)
381 /* --- @xsalsa20{,12,8}_setnonce@ --- *
383 * Arguments: @xsalsa20R_ctx *ctx@ = pointer to context
384 * @const void *nonce@ = the nonce (@XSALSA20_NONCESZ@ bytes)
388 * Use: Set a new nonce in the context @ctx@, e.g., for processing a
389 * different message. The stream position is reset to zero (see
390 * @salsa20_seek@ etc.).
392 * There is a different function for each number of rounds,
393 * unlike for plain Salsa20.
396 #define DEFXNONCE(r) \
397 void XSALSA20_SETNONCE(r, XSALSA20_CTX(r) *ctx, const void *nonce) \
399 const octet *n = nonce; \
400 uint32 in[4], out[8]; \
403 for (i = 0; i < 4; i++) in[i] = LOAD32_L(n + 4*i); \
404 HSALSA20_RAW(r, ctx->k, in, out); \
405 for (i = 0; i < 4; i++) ctx->s.a[13 - 3*i] = out[i]; \
406 for (i = 4; i < 8; i++) ctx->s.a[27 - 3*i] = out[i]; \
407 salsa20_setnonce(&ctx->s, n + 16); \
409 SALSA20_VARS(DEFXNONCE
)
411 /* --- @xsalsa20{,12,8}_seek@, @xsalsa20{,12,8}_seeku64@ --- *
413 * Arguments: @xsalsa20R_ctx *ctx@ = pointer to context
414 * @unsigned long i@, @kludge64 i@ = new position to set
418 * Use: Sets a new stream position, in units of Salsa20 output
419 * blocks, which are @XSALSA20_OUTSZ@ bytes each. Byte
420 * granularity can be achieved by calling @xsalsa20R_encrypt@
423 * There is a different function for each number of rounds,
424 * unlike for plain Salsa20, because the context structures are
428 /* --- @xsalsa20{,12,8}_tell@, @xsalsa20{,12,8}_tellu64@ --- *
430 * Arguments: @salsa20_ctx *ctx@ = pointer to context
432 * Returns: The current position in the output stream, in blocks,
435 * There is a different function for each number of rounds,
436 * unlike for plain Salsa20, because the context structures are
440 /* --- @xsalsa20{,12,8}_encrypt@ --- *
442 * Arguments: @xsalsa20R_ctx *ctx@ = pointer to context
443 * @const void *src@ = source buffer (or null)
444 * @void *dest@ = destination buffer (or null)
445 * @size_t sz@ = size of the buffers
449 * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@.
450 * XSalsa20 works by XORing plaintext with a keystream, so
451 * encryption and decryption are the same operation. If @dest@
452 * is null then ignore @src@ and skip @sz@ bytes of the
453 * keystream. If @src@ is null, then just write the keystream
457 #define DEFXPASSTHRU(r) \
458 void XSALSA20_SEEK(r, XSALSA20_CTX(r) *ctx, unsigned long i) \
459 { salsa20_seek(&ctx->s, i); } \
460 void XSALSA20_SEEKU64(r, XSALSA20_CTX(r) *ctx, kludge64 i) \
461 { salsa20_seeku64(&ctx->s, i); } \
462 unsigned long XSALSA20_TELL(r, XSALSA20_CTX(r) *ctx) \
463 { return salsa20_tell(&ctx->s); } \
464 kludge64 XSALSA20_TELLU64(r, XSALSA20_CTX(r) *ctx) \
465 { return salsa20_tellu64(&ctx->s); } \
466 void XSALSA20_ENCRYPT(r, XSALSA20_CTX(r) *ctx, \
467 const void *src, void *dest, size_t sz) \
468 { SALSA20_ENCRYPT(r, &ctx->s, src, dest, sz); }
469 SALSA20_VARS(DEFXPASSTHRU
)
471 /*----- Generic cipher interface ------------------------------------------*/
473 typedef struct gctx
{ gcipher c
; salsa20_ctx ctx
; } gctx
;
475 static void gsetiv(gcipher
*c
, const void *iv
)
476 { gctx
*g
= (gctx
*)c
; salsa20_setnonce(&g
->ctx
, iv
); }
478 static void gdestroy(gcipher
*c
)
479 { gctx
*g
= (gctx
*)c
; BURN(*g
); S_DESTROY(g
); }
481 #define DEFGCIPHER(r) \
483 static const gcipher_ops gops_##r; \
485 static gcipher *ginit_##r(const void *k, size_t sz) \
487 gctx *g = S_CREATE(gctx); \
488 g->c.ops = &gops_##r; \
489 salsa20_init(&g->ctx, k, sz, 0); \
493 static void gencrypt_##r(gcipher *c, const void *s, \
494 void *t, size_t sz) \
495 { gctx *g = (gctx *)c; SALSA20_ENCRYPT(r, &g->ctx, s, t, sz); } \
497 static const gcipher_ops gops_##r = { \
498 &SALSA20_DECOR(salsa20, r, ), \
499 gencrypt_##r, gencrypt_##r, gdestroy, gsetiv, 0 \
502 const gccipher SALSA20_DECOR(salsa20, r, ) = { \
503 SALSA20_NAME_##r, salsa20_keysz, \
504 SALSA20_NONCESZ, ginit_##r \
507 SALSA20_VARS(DEFGCIPHER
)
509 #define DEFGXCIPHER(r) \
511 typedef struct { gcipher c; XSALSA20_CTX(r) ctx; } gxctx_##r; \
513 static void gxsetiv_##r(gcipher *c, const void *iv) \
514 { gxctx_##r *g = (gxctx_##r *)c; XSALSA20_SETNONCE(r, &g->ctx, iv); } \
516 static void gxdestroy_##r(gcipher *c) \
517 { gxctx_##r *g = (gxctx_##r *)c; BURN(*g); S_DESTROY(g); } \
519 static const gcipher_ops gxops_##r; \
521 static gcipher *gxinit_##r(const void *k, size_t sz) \
523 gxctx_##r *g = S_CREATE(gxctx_##r); \
524 g->c.ops = &gxops_##r; \
525 XSALSA20_INIT(r, &g->ctx, k, sz, 0); \
529 static void gxencrypt_##r(gcipher *c, const void *s, \
530 void *t, size_t sz) \
532 gxctx_##r *g = (gxctx_##r *)c; \
533 XSALSA20_ENCRYPT(r, &g->ctx, s, t, sz); \
536 static const gcipher_ops gxops_##r = { \
537 &SALSA20_DECOR(xsalsa20, r, ), \
538 gxencrypt_##r, gxencrypt_##r, gxdestroy_##r, gxsetiv_##r, 0 \
541 const gccipher SALSA20_DECOR(xsalsa20, r, ) = { \
542 "x" SALSA20_NAME_##r, salsa20_keysz, \
543 XSALSA20_NONCESZ, gxinit_##r \
546 SALSA20_VARS(DEFGXCIPHER
)
548 /*----- Generic random number generator interface -------------------------*/
550 typedef struct grops
{
552 void (*seek
)(void *, kludge64
);
553 kludge64 (*tell
)(void *);
554 void (*setnonce
)(void *, const void *);
555 void (*generate
)(void *, void *, size_t);
558 typedef struct grbasectx
{
563 static int grmisc(grand
*r
, unsigned op
, ...)
565 octet buf
[XSALSA20_NONCESZ
];
566 grbasectx
*g
= (grbasectx
*)r
;
580 switch (va_arg(ap
, unsigned)) {
583 case GRAND_SEEDUINT32
:
584 case GRAND_SEEDBLOCK
:
587 case SALSA20_SEEKU64
:
589 case SALSA20_TELLU64
:
599 i
= va_arg(ap
, unsigned); STORE32_L(buf
, i
);
600 memset(buf
+ 4, 0, g
->ops
->noncesz
- 4);
601 g
->ops
->setnonce(g
, buf
);
603 case GRAND_SEEDUINT32
:
604 i
= va_arg(ap
, uint32
); STORE32_L(buf
, i
);
605 memset(buf
+ 4, 0, g
->ops
->noncesz
- 4);
606 g
->ops
->setnonce(g
, buf
);
608 case GRAND_SEEDBLOCK
:
609 p
= va_arg(ap
, const void *);
610 sz
= va_arg(ap
, size_t);
611 if (sz
< g
->ops
->noncesz
) {
613 memset(buf
+ sz
, 0, g
->ops
->noncesz
- sz
);
616 g
->ops
->setnonce(g
, p
);
619 rr
= va_arg(ap
, grand
*);
620 rr
->ops
->fill(rr
, buf
, g
->ops
->noncesz
);
621 g
->ops
->setnonce(g
, buf
);
624 ul
= va_arg(ap
, unsigned long); ASSIGN64(pos
, ul
);
625 g
->ops
->seek(g
, pos
);
627 case SALSA20_SEEKU64
:
628 pos
= va_arg(ap
, kludge64
);
629 g
->ops
->seek(g
, pos
);
632 pos
= g
->ops
->tell(g
);
633 *va_arg(ap
, unsigned long *) = GET64(unsigned long, pos
);
635 case SALSA20_TELLU64
:
636 *va_arg(ap
, kludge64
*) = g
->ops
->tell(g
);
646 static octet
grbyte(grand
*r
)
648 grbasectx
*g
= (grbasectx
*)r
;
650 g
->ops
->generate(g
, &o
, 1);
654 static uint32
grword(grand
*r
)
656 grbasectx
*g
= (grbasectx
*)r
;
658 g
->ops
->generate(g
, b
, sizeof(b
));
659 return (LOAD32_L(b
));
662 static void grfill(grand
*r
, void *p
, size_t sz
)
664 grbasectx
*g
= (grbasectx
*)r
;
665 g
->ops
->generate(r
, p
, sz
);
668 typedef struct grctx
{
673 static void gr_seek(void *r
, kludge64 pos
)
674 { grctx
*g
= r
; salsa20_seeku64(&g
->ctx
, pos
); }
676 static kludge64
gr_tell(void *r
)
677 { grctx
*g
= r
; return (salsa20_tellu64(&g
->ctx
)); }
679 static void gr_setnonce(void *r
, const void *n
)
680 { grctx
*g
= r
; salsa20_setnonce(&g
->ctx
, n
); }
682 static void grdestroy(grand
*r
)
683 { grctx
*g
= (grctx
*)r
; BURN(*g
); S_DESTROY(g
); }
685 #define DEFGRAND(rr) \
687 static void gr_generate_##rr(void *r, void *b, size_t sz) \
688 { grctx *g = r; SALSA20_ENCRYPT(rr, &g->ctx, 0, b, sz); } \
690 static const grops grops_##rr = \
691 { SALSA20_NONCESZ, gr_seek, gr_tell, \
692 gr_setnonce, gr_generate_##rr }; \
694 static const grand_ops grops_rand_##rr = { \
695 SALSA20_NAME_##rr, GRAND_CRYPTO, 0, \
696 grmisc, grdestroy, grword, \
697 grbyte, grword, grand_range, grfill \
700 grand *SALSA20_DECOR(salsa20, rr, _rand) \
701 (const void *k, size_t ksz, const void *n) \
703 grctx *g = S_CREATE(g); \
704 g->r.r.ops = &grops_rand_##rr; \
705 g->r.ops = &grops_##rr; \
706 salsa20_init(&g->ctx, k, ksz, n); \
709 SALSA20_VARS(DEFGRAND
)
711 #define DEFXGRAND(rr) \
713 typedef struct grxctx_##rr { \
715 XSALSA20_CTX(rr) ctx; \
718 static void grx_seek_##rr(void *r, kludge64 pos) \
719 { grxctx_##rr *g = r; XSALSA20_SEEKU64(rr, &g->ctx, pos); } \
721 static kludge64 grx_tell_##rr(void *r) \
722 { grxctx_##rr *g = r; return (XSALSA20_TELLU64(rr, &g->ctx)); } \
724 static void grx_setnonce_##rr(void *r, const void *n) \
725 { grxctx_##rr *g = r; XSALSA20_SETNONCE(rr, &g->ctx, n); } \
727 static void grxdestroy_##rr(grand *r) \
728 { grxctx_##rr *g = (grxctx_##rr *)r; BURN(*g); S_DESTROY(g); } \
730 static void grx_generate_##rr(void *r, void *b, size_t sz) \
731 { grxctx_##rr *g = r; XSALSA20_ENCRYPT(rr, &g->ctx, 0, b, sz); } \
733 static const grops grxops_##rr = \
734 { XSALSA20_NONCESZ, grx_seek_##rr, grx_tell_##rr, \
735 grx_setnonce_##rr, grx_generate_##rr }; \
737 static const grand_ops grxops_rand_##rr = { \
738 "x" SALSA20_NAME_##rr, GRAND_CRYPTO, 0, \
739 grmisc, grxdestroy_##rr, grword, \
740 grbyte, grword, grand_range, grfill \
743 grand *SALSA20_DECOR(xsalsa20, rr, _rand) \
744 (const void *k, size_t ksz, const void *n) \
746 grxctx_##rr *g = S_CREATE(g); \
747 g->r.r.ops = &grxops_rand_##rr; \
748 g->r.ops = &grxops_##rr; \
749 XSALSA20_INIT(rr, &g->ctx, k, ksz, n); \
752 SALSA20_VARS(DEFXGRAND
)
754 /*----- Test rig ----------------------------------------------------------*/
761 #include <mLib/quis.h>
762 #include <mLib/testrig.h>
764 static const int perm
[] = {
771 #define DEFVCORE(r) \
772 static int v_core_##r(dstr *v) \
774 salsa20_matrix a, b; \
775 dstr d = DSTR_INIT; \
779 DENSURE(&d, SALSA20_OUTSZ); d.len = SALSA20_OUTSZ; \
780 n = *(int *)v[0].buf; \
781 for (i = 0; i < SALSA20_OUTSZ/4; i++) \
782 b[i] = LOAD32_L(v[1].buf + 4*i); \
783 for (i = 0; i < n; i++) { \
784 for (j = 0; j < 16; j++) a[perm[j]] = b[j]; \
786 memcpy(a, b, sizeof(a)); \
788 for (i = 0; i < SALSA20_OUTSZ/4; i++) STORE32_L(d.buf + 4*i, b[i]); \
790 if (d.len != v[2].len || memcmp(d.buf, v[2].buf, v[2].len) != 0) { \
792 printf("\nfail core:" \
793 "\n\titerations = %d" \
795 type_hex.dump(&v[1], stdout); \
796 printf("\n\texpected = "); \
797 type_hex.dump(&v[2], stdout); \
798 printf("\n\tcalculated = "); \
799 type_hex.dump(&d, stdout); \
806 SALSA20_VARS(DEFVCORE
)
808 #define SALSA20_CTX(r) salsa20_ctx
809 #define SALSA20_INIT(r, ctx, k, ksz, n) salsa20_init(ctx, k, ksz, n)
810 #define SALSA20_SEEKU64(r, ctx, i) salsa20_seeku64(ctx, i)
812 #define DEFxVENC(base, BASE, r) \
813 static int v_encrypt_##base##_##r(dstr *v) \
816 dstr d = DSTR_INIT; \
818 const octet *p, *p0; \
820 size_t sz, sz0, step; \
821 unsigned long skip; \
824 if (v[4].len) { p0 = (const octet *)v[4].buf; sz0 = v[4].len; } \
825 else { p0 = 0; sz0 = v[5].len; } \
826 DENSURE(&d, sz0); d.len = sz0; \
827 skip = *(unsigned long *)v[3].buf; \
830 while (step < sz0 + skip) { \
831 step = step ? 3*step + 4 : 1; \
832 if (step > sz0 + skip) step = sz0 + skip; \
833 BASE##_INIT(r, &ctx, v[0].buf, v[0].len, v[1].buf); \
835 LOAD64_(pos, v[2].buf); \
836 BASE##_SEEKU64(r, &ctx, pos); \
839 for (sz = skip; sz >= step; sz -= step) \
840 BASE##_ENCRYPT(r, &ctx, 0, 0, step); \
841 if (sz) BASE##_ENCRYPT(r, &ctx, 0, 0, sz); \
842 for (p = p0, q = (octet *)d.buf, sz = sz0; \
844 sz -= step, q += step) { \
845 BASE##_ENCRYPT(r, &ctx, p, q, step); \
848 if (sz) BASE##_ENCRYPT(r, &ctx, p, q, sz); \
850 if (d.len != v[5].len || memcmp(d.buf, v[5].buf, v[5].len) != 0) { \
852 printf("\nfail encrypt:" \
854 "\n\tkey = ", (unsigned long)step); \
855 type_hex.dump(&v[0], stdout); \
856 printf("\n\tnonce = "); \
857 type_hex.dump(&v[1], stdout); \
858 printf("\n\tposition = "); \
859 type_hex.dump(&v[2], stdout); \
860 printf("\n\tskip = %lu", skip); \
861 printf("\n\tmessage = "); \
862 type_hex.dump(&v[4], stdout); \
863 printf("\n\texpected = "); \
864 type_hex.dump(&v[5], stdout); \
865 printf("\n\tcalculated = "); \
866 type_hex.dump(&d, stdout); \
874 #define DEFVENC(r) DEFxVENC(salsa20, SALSA20, r)
875 #define DEFXVENC(r) DEFxVENC(xsalsa20, XSALSA20, r)
876 SALSA20_VARS(DEFVENC
)
877 SALSA20_VARS(DEFXVENC
)
879 static test_chunk defs
[] = {
880 #define DEFxTAB(pre, base, r) \
881 { pre SALSA20_NAME_##r, v_encrypt_##base##_##r, \
882 { &type_hex, &type_hex, &type_hex, &type_ulong, \
883 &type_hex, &type_hex, 0 } },
885 { SALSA20_NAME_##r "-core", v_core_##r, \
886 { &type_int, &type_hex, &type_hex, 0 } }, \
887 DEFxTAB("", salsa20, r)
888 #define DEFXTAB(r) DEFxTAB("x", xsalsa20, r)
890 SALSA20_VARS(DEFXTAB
)
894 int main(int argc
, char *argv
[])
896 test_run(argc
, argv
, defs
, SRCDIR
"/t/salsa20");
902 /*----- That's all, folks -------------------------------------------------*/