3 * Salsa20 stream cipher
5 * (c) 2015 Straylight/Edgeware
8 /*----- Header files ------------------------------------------------------*/
12 #include <mLib/bits.h>
20 #include "salsa20-core.h"
22 /*----- Global variables --------------------------------------------------*/
24 const octet salsa20_keysz
[] = { KSZ_SET
, 32, 16, 10, 0 };
26 /*----- The Salsa20 core function and utilities ---------------------------*/
30 * Arguments: @unsigned r@ = number of rounds
31 * @const salsa20_matrix src@ = input matrix
32 * @salsa20_matrix dest@ = where to put the output
37 * Use: Apply the Salsa20/r core function to @src@, writing the
38 * result to @dest@. This consists of @r@ rounds followed by
39 * the feedforward step.
42 static void core(unsigned r
, const salsa20_matrix src
, salsa20_matrix dest
)
43 { SALSA20_nR(dest
, src
, r
); SALSA20_FFWD(dest
, src
); }
45 /* --- @populate@ --- *
47 * Arguments: @salsa20_matrix a@ = a matrix to fill in
48 * @const void *key@ = pointer to key material
49 * @size_t ksz@ = size of key
53 * Use: Fills in a Salsa20 matrix from the key, setting the
54 * appropriate constants according to the key length. The nonce
55 * and position words are left uninitialized.
58 static void populate(salsa20_matrix a
, const void *key
, size_t ksz
)
62 KSZ_ASSERT(salsa20
, ksz
);
64 /* Here's the pattern of key, constant, nonce, and counter pieces in the
65 * matrix, before and after our permutation.
67 * [ C0 K0 K1 K2 ] [ C0 C1 C2 C3 ]
68 * [ K3 C1 N0 N1 ] --> [ K3 T1 K7 K2 ]
69 * [ T0 T1 C2 K4 ] [ T0 K6 K1 N1 ]
70 * [ K5 K6 K7 C3 ] [ K5 K0 N0 K4 ]
73 a
[13] = LOAD32_L(k
+ 0);
74 a
[10] = LOAD32_L(k
+ 4);
76 a
[ 7] = LOAD16_L(k
+ 8);
79 a
[ 7] = LOAD32_L(k
+ 8);
80 a
[ 4] = LOAD32_L(k
+ 12);
89 a
[ 2] = ksz
== 10 ? SALSA20_C80
: SALSA20_C128
;
92 a
[15] = LOAD32_L(k
+ 16);
93 a
[12] = LOAD32_L(k
+ 20);
94 a
[ 9] = LOAD32_L(k
+ 24);
95 a
[ 6] = LOAD32_L(k
+ 28);
103 /*----- Salsa20 implementation --------------------------------------------*/
105 /* --- @salsa20_init@ --- *
107 * Arguments: @salsa20_ctx *ctx@ = context to fill in
108 * @const void *key@ = pointer to key material
109 * @size_t ksz@ = size of key (either 32 or 16)
110 * @const void *nonce@ = initial nonce, or null
114 * Use: Initializes a Salsa20 context ready for use.
117 void salsa20_init(salsa20_ctx
*ctx
, const void *key
, size_t ksz
,
120 static const octet zerononce
[SALSA20_NONCESZ
];
122 populate(ctx
->a
, key
, ksz
);
123 salsa20_setnonce(ctx
, nonce ? nonce
: zerononce
);
126 /* --- @salsa20_setnonce@ --- *
128 * Arguments: @salsa20_ctx *ctx@ = pointer to context
129 * @const void *nonce@ = the nonce (@SALSA20_NONCESZ@ bytes)
133 * Use: Set a new nonce in the context @ctx@, e.g., for processing a
134 * different message. The stream position is reset to zero (see
135 * @salsa20_seek@ etc.).
138 void salsa20_setnonce(salsa20_ctx
*ctx
, const void *nonce
)
140 const octet
*n
= nonce
;
142 ctx
->a
[14] = LOAD32_L(n
+ 0);
143 ctx
->a
[11] = LOAD32_L(n
+ 4);
144 salsa20_seek(ctx
, 0);
147 /* --- @salsa20_seek@, @salsa20_seeku64@ --- *
149 * Arguments: @salsa20_ctx *ctx@ = pointer to context
150 * @unsigned long i@, @kludge64 i@ = new position to set
154 * Use: Sets a new stream position, in units of Salsa20 output
155 * blocks, which are @SALSA20_OUTSZ@ bytes each. Byte
156 * granularity can be achieved by calling @salsa20R_encrypt@
160 void salsa20_seek(salsa20_ctx
*ctx
, unsigned long i
)
161 { kludge64 ii
; ASSIGN64(ii
, i
); salsa20_seeku64(ctx
, ii
); }
163 void salsa20_seeku64(salsa20_ctx
*ctx
, kludge64 i
)
165 ctx
->a
[8] = LO64(i
); ctx
->a
[5] = HI64(i
);
166 ctx
->bufi
= SALSA20_OUTSZ
;
169 /* --- @salsa20_tell@, @salsa20_tellu64@ --- *
171 * Arguments: @salsa20_ctx *ctx@ = pointer to context
173 * Returns: The current position in the output stream, in blocks,
177 unsigned long salsa20_tell(salsa20_ctx
*ctx
)
178 { kludge64 i
= salsa20_tellu64(ctx
); return (GET64(unsigned long, i
)); }
180 kludge64
salsa20_tellu64(salsa20_ctx
*ctx
)
181 { kludge64 i
; SET64(i
, ctx
->a
[5], ctx
->a
[8]); return (i
); }
183 /* --- @salsa20{,12,8}_encrypt@ --- *
185 * Arguments: @salsa20_ctx *ctx@ = pointer to context
186 * @const void *src@ = source buffer (or null)
187 * @void *dest@ = destination buffer (or null)
188 * @size_t sz@ = size of the buffers
192 * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@.
193 * Salsa20 works by XORing plaintext with a keystream, so
194 * encryption and decryption are the same operation. If @dest@
195 * is null then ignore @src@ and skip @sz@ bytes of the
196 * keystream. If @src@ is null, then just write the keystream
200 #define SALSA20_ENCRYPT(r, ctx, src, dest, sz) \
201 SALSA20_DECOR(salsa20, r, _encrypt)(ctx, src, dest, sz)
202 #define DEFENCRYPT(r) \
203 void SALSA20_ENCRYPT(r, salsa20_ctx *ctx, const void *src, \
204 void *dest, size_t sz) \
207 const octet *s = src; \
210 kludge64 pos, delta; \
212 SALSA20_OUTBUF(ctx, d, s, sz); \
216 n = sz/SALSA20_OUTSZ; \
217 pos = salsa20_tellu64(ctx); \
218 ASSIGN64(delta, n); \
219 ADD64(pos, pos, delta); \
220 salsa20_seeku64(ctx, pos); \
221 sz = sz%SALSA20_OUTSZ; \
223 while (sz >= SALSA20_OUTSZ) { \
224 core(r, ctx->a, b); \
225 SALSA20_STEP(ctx->a); \
226 SALSA20_GENFULL(b, d); \
227 sz -= SALSA20_OUTSZ; \
230 while (sz >= SALSA20_OUTSZ) { \
231 core(r, ctx->a, b); \
232 SALSA20_STEP(ctx->a); \
233 SALSA20_MIXFULL(b, d, s); \
234 sz -= SALSA20_OUTSZ; \
239 core(r, ctx->a, b); \
240 SALSA20_STEP(ctx->a); \
241 SALSA20_PREPBUF(ctx, b); \
242 SALSA20_OUTBUF(ctx, d, s, sz); \
246 SALSA20_VARS(DEFENCRYPT
)
248 /*----- HSalsa20 implementation -------------------------------------------*/
250 #define HSALSA20_RAW(r, ctx, src, dest) \
251 SALSA20_DECOR(hsalsa20, r, _raw)(ctx, src, dest)
252 #define HSALSA20_PRF(r, ctx, src, dest) \
253 SALSA20_DECOR(hsalsa20, r, _prf)(ctx, src, dest)
255 /* --- @hsalsa20{,12,8}_prf@ --- *
257 * Arguments: @salsa20_ctx *ctx@ = pointer to context
258 * @const void *src@ = the input (@HSALSA20_INSZ@ bytes)
259 * @void *dest@ = the output (@HSALSA20_OUTSZ@ bytes)
263 * Use: Apply the HSalsa20/r pseudorandom function to @src@, writing
264 * the result to @out@.
267 #define DEFHSALSA20(r) \
268 static void HSALSA20_RAW(r, salsa20_matrix k, \
269 const uint32 *src, uint32 *dest) \
274 /* --- HSalsa20, computed from full Salsa20 --- * \
276 * The security proof makes use of the fact that HSalsa20 (i.e., \
277 * without the final feedforward step) can be computed from full \
278 * Salsa20 using only knowledge of the non-secret input. I don't \
279 * want to compromise the performance of the main function by \
280 * making the feedforward step separate, but this operation is less \
281 * speed critical, so we do it the harder way. \
284 for (i = 0; i < 4; i++) k[14 - 3*i] = src[i]; \
286 for (i = 0; i < 4; i++) dest[i] = a[5*i] - k[i]; \
287 for (i = 4; i < 8; i++) dest[i] = a[i + 2] - k[26 - 3*i]; \
290 void HSALSA20_PRF(r, salsa20_ctx *ctx, const void *src, void *dest) \
292 const octet *s = src; \
294 uint32 in[4], out[8]; \
297 for (i = 0; i < 4; i++) in[i] = LOAD32_L(s + 4*i); \
298 HSALSA20_RAW(r, ctx->a, in, out); \
299 for (i = 0; i < 8; i++) STORE32_L(d + 4*i, out[i]); \
301 SALSA20_VARS(DEFHSALSA20
)
303 /*----- XSalsa20 implementation -------------------------------------------*/
305 /* --- Some convenient macros for naming functions --- *
307 * Because the crypto core is involved in XSalsa20/r's per-nonce setup, we
308 * need to take an interest in the number of rounds in most of the various
309 * functions, and it will probably help if we distinguish the context
310 * structures for the various versions.
313 #define XSALSA20_CTX(r) SALSA20_DECOR(xsalsa20, r, _ctx)
314 #define XSALSA20_INIT(r, ctx, k, ksz, n) \
315 SALSA20_DECOR(xsalsa20, r, _init)(ctx, k, ksz, n)
316 #define XSALSA20_SETNONCE(r, ctx, n) \
317 SALSA20_DECOR(xsalsa20, r, _setnonce)(ctx, n)
318 #define XSALSA20_SEEK(r, ctx, i) \
319 SALSA20_DECOR(xsalsa20, r, _seek)(ctx, i)
320 #define XSALSA20_SEEKU64(r, ctx, i) \
321 SALSA20_DECOR(xsalsa20, r, _seeku64)(ctx, i)
322 #define XSALSA20_TELL(r, ctx) \
323 SALSA20_DECOR(xsalsa20, r, _tell)(ctx)
324 #define XSALSA20_TELLU64(r, ctx) \
325 SALSA20_DECOR(xsalsa20, r, _tellu64)(ctx)
326 #define XSALSA20_ENCRYPT(r, ctx, src, dest, sz) \
327 SALSA20_DECOR(xsalsa20, r, _encrypt)(ctx, src, dest, sz)
329 /* --- @xsalsa20{,12,8}_init@ --- *
331 * Arguments: @xsalsa20R_ctx *ctx@ = the context to fill in
332 * @const void *key@ = pointer to key material
333 * @size_t ksz@ = size of key (either 32 or 16)
334 * @const void *nonce@ = initial nonce, or null
338 * Use: Initializes an XSalsa20/r context ready for use.
340 * There is a different function for each number of rounds,
341 * unlike for plain Salsa20.
344 #define DEFXINIT(r) \
345 void XSALSA20_INIT(r, XSALSA20_CTX(r) *ctx, \
346 const void *key, size_t ksz, const void *nonce) \
348 static const octet zerononce[XSALSA20_NONCESZ]; \
350 populate(ctx->k, key, ksz); \
351 ctx->s.a[ 0] = SALSA20_A256; \
352 ctx->s.a[ 1] = SALSA20_B256; \
353 ctx->s.a[ 2] = SALSA20_C256; \
354 ctx->s.a[ 3] = SALSA20_D256; \
355 XSALSA20_SETNONCE(r, ctx, nonce ? nonce : zerononce); \
357 SALSA20_VARS(DEFXINIT
)
359 /* --- @xsalsa20{,12,8}_setnonce@ --- *
361 * Arguments: @xsalsa20R_ctx *ctx@ = pointer to context
362 * @const void *nonce@ = the nonce (@XSALSA20_NONCESZ@ bytes)
366 * Use: Set a new nonce in the context @ctx@, e.g., for processing a
367 * different message. The stream position is reset to zero (see
368 * @salsa20_seek@ etc.).
370 * There is a different function for each number of rounds,
371 * unlike for plain Salsa20.
374 #define DEFXNONCE(r) \
375 void XSALSA20_SETNONCE(r, XSALSA20_CTX(r) *ctx, const void *nonce) \
377 const octet *n = nonce; \
378 uint32 in[4], out[8]; \
381 for (i = 0; i < 4; i++) in[i] = LOAD32_L(n + 4*i); \
382 HSALSA20_RAW(r, ctx->k, in, out); \
383 for (i = 0; i < 4; i++) ctx->s.a[13 - 3*i] = out[i]; \
384 for (i = 4; i < 8; i++) ctx->s.a[27 - 3*i] = out[i]; \
385 salsa20_setnonce(&ctx->s, n + 16); \
387 SALSA20_VARS(DEFXNONCE
)
389 /* --- @xsalsa20{,12,8}_seek@, @xsalsa20{,12,8}_seeku64@ --- *
391 * Arguments: @xsalsa20R_ctx *ctx@ = pointer to context
392 * @unsigned long i@, @kludge64 i@ = new position to set
396 * Use: Sets a new stream position, in units of Salsa20 output
397 * blocks, which are @XSALSA20_OUTSZ@ bytes each. Byte
398 * granularity can be achieved by calling @xsalsa20R_encrypt@
401 * There is a different function for each number of rounds,
402 * unlike for plain Salsa20, because the context structures are
406 /* --- @xsalsa20{,12,8}_tell@, @xsalsa20{,12,8}_tellu64@ --- *
408 * Arguments: @salsa20_ctx *ctx@ = pointer to context
410 * Returns: The current position in the output stream, in blocks,
413 * There is a different function for each number of rounds,
414 * unlike for plain Salsa20, because the context structures are
418 /* --- @xsalsa20{,12,8}_encrypt@ --- *
420 * Arguments: @xsalsa20R_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
427 * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@.
428 * XSalsa20 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
435 #define DEFXPASSTHRU(r) \
436 void XSALSA20_SEEK(r, XSALSA20_CTX(r) *ctx, unsigned long i) \
437 { salsa20_seek(&ctx->s, i); } \
438 void XSALSA20_SEEKU64(r, XSALSA20_CTX(r) *ctx, kludge64 i) \
439 { salsa20_seeku64(&ctx->s, i); } \
440 unsigned long XSALSA20_TELL(r, XSALSA20_CTX(r) *ctx) \
441 { return salsa20_tell(&ctx->s); } \
442 kludge64 XSALSA20_TELLU64(r, XSALSA20_CTX(r) *ctx) \
443 { return salsa20_tellu64(&ctx->s); } \
444 void XSALSA20_ENCRYPT(r, XSALSA20_CTX(r) *ctx, \
445 const void *src, void *dest, size_t sz) \
446 { SALSA20_ENCRYPT(r, &ctx->s, src, dest, sz); }
447 SALSA20_VARS(DEFXPASSTHRU
)
449 /*----- Generic cipher interface ------------------------------------------*/
451 typedef struct gctx
{ gcipher c
; salsa20_ctx ctx
; } gctx
;
453 static void gsetiv(gcipher
*c
, const void *iv
)
454 { gctx
*g
= (gctx
*)c
; salsa20_setnonce(&g
->ctx
, iv
); }
456 static void gdestroy(gcipher
*c
)
457 { gctx
*g
= (gctx
*)c
; BURN(*g
); S_DESTROY(g
); }
459 #define DEFGCIPHER(r) \
461 static const gcipher_ops gops_##r; \
463 static gcipher *ginit_##r(const void *k, size_t sz) \
465 gctx *g = S_CREATE(gctx); \
466 g->c.ops = &gops_##r; \
467 salsa20_init(&g->ctx, k, sz, 0); \
471 static void gencrypt_##r(gcipher *c, const void *s, \
472 void *t, size_t sz) \
473 { gctx *g = (gctx *)c; SALSA20_ENCRYPT(r, &g->ctx, s, t, sz); } \
475 static const gcipher_ops gops_##r = { \
476 &SALSA20_DECOR(salsa20, r, ), \
477 gencrypt_##r, gencrypt_##r, gdestroy, gsetiv, 0 \
480 const gccipher SALSA20_DECOR(salsa20, r, ) = { \
481 SALSA20_NAME_##r, salsa20_keysz, \
482 SALSA20_NONCESZ, ginit_##r \
485 SALSA20_VARS(DEFGCIPHER
)
487 #define DEFGXCIPHER(r) \
489 typedef struct { gcipher c; XSALSA20_CTX(r) ctx; } gxctx_##r; \
491 static void gxsetiv_##r(gcipher *c, const void *iv) \
492 { gxctx_##r *g = (gxctx_##r *)c; XSALSA20_SETNONCE(r, &g->ctx, iv); } \
494 static void gxdestroy_##r(gcipher *c) \
495 { gxctx_##r *g = (gxctx_##r *)c; BURN(*g); S_DESTROY(g); } \
497 static const gcipher_ops gxops_##r; \
499 static gcipher *gxinit_##r(const void *k, size_t sz) \
501 gxctx_##r *g = S_CREATE(gxctx_##r); \
502 g->c.ops = &gxops_##r; \
503 XSALSA20_INIT(r, &g->ctx, k, sz, 0); \
507 static void gxencrypt_##r(gcipher *c, const void *s, \
508 void *t, size_t sz) \
510 gxctx_##r *g = (gxctx_##r *)c; \
511 XSALSA20_ENCRYPT(r, &g->ctx, s, t, sz); \
514 static const gcipher_ops gxops_##r = { \
515 &SALSA20_DECOR(xsalsa20, r, ), \
516 gxencrypt_##r, gxencrypt_##r, gxdestroy_##r, gxsetiv_##r, 0 \
519 const gccipher SALSA20_DECOR(xsalsa20, r, ) = { \
520 "x" SALSA20_NAME_##r, salsa20_keysz, \
521 XSALSA20_NONCESZ, gxinit_##r \
524 SALSA20_VARS(DEFGXCIPHER
)
526 /*----- Generic random number generator interface -------------------------*/
528 typedef struct grops
{
530 void (*seek
)(void *, kludge64
);
531 kludge64 (*tell
)(void *);
532 void (*setnonce
)(void *, const void *);
533 void (*generate
)(void *, void *, size_t);
536 typedef struct grbasectx
{
541 static int grmisc(grand
*r
, unsigned op
, ...)
543 octet buf
[XSALSA20_NONCESZ
];
544 grbasectx
*g
= (grbasectx
*)r
;
558 switch (va_arg(ap
, unsigned)) {
561 case GRAND_SEEDUINT32
:
562 case GRAND_SEEDBLOCK
:
565 case SALSA20_SEEKU64
:
567 case SALSA20_TELLU64
:
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
);
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
);
586 case GRAND_SEEDBLOCK
:
587 p
= va_arg(ap
, const void *);
588 sz
= va_arg(ap
, size_t);
589 if (sz
< g
->ops
->noncesz
) {
591 memset(buf
+ sz
, 0, g
->ops
->noncesz
- sz
);
594 g
->ops
->setnonce(g
, p
);
597 rr
= va_arg(ap
, grand
*);
598 rr
->ops
->fill(rr
, buf
, g
->ops
->noncesz
);
599 g
->ops
->setnonce(g
, buf
);
602 ul
= va_arg(ap
, unsigned long); ASSIGN64(pos
, ul
);
603 g
->ops
->seek(g
, pos
);
605 case SALSA20_SEEKU64
:
606 pos
= va_arg(ap
, kludge64
);
607 g
->ops
->seek(g
, pos
);
610 pos
= g
->ops
->tell(g
);
611 *va_arg(ap
, unsigned long *) = GET64(unsigned long, pos
);
613 case SALSA20_TELLU64
:
614 *va_arg(ap
, kludge64
*) = g
->ops
->tell(g
);
624 static octet
grbyte(grand
*r
)
626 grbasectx
*g
= (grbasectx
*)r
;
628 g
->ops
->generate(g
, &o
, 1);
632 static uint32
grword(grand
*r
)
634 grbasectx
*g
= (grbasectx
*)r
;
636 g
->ops
->generate(g
, b
, sizeof(b
));
637 return (LOAD32_L(b
));
640 static void grfill(grand
*r
, void *p
, size_t sz
)
642 grbasectx
*g
= (grbasectx
*)r
;
643 g
->ops
->generate(r
, p
, sz
);
646 typedef struct grctx
{
651 static void gr_seek(void *r
, kludge64 pos
)
652 { grctx
*g
= r
; salsa20_seeku64(&g
->ctx
, pos
); }
654 static kludge64
gr_tell(void *r
)
655 { grctx
*g
= r
; return (salsa20_tellu64(&g
->ctx
)); }
657 static void gr_setnonce(void *r
, const void *n
)
658 { grctx
*g
= r
; salsa20_setnonce(&g
->ctx
, n
); }
660 static void grdestroy(grand
*r
)
661 { grctx
*g
= (grctx
*)r
; BURN(*g
); S_DESTROY(g
); }
663 #define DEFGRAND(rr) \
665 static void gr_generate_##rr(void *r, void *b, size_t sz) \
666 { grctx *g = r; SALSA20_ENCRYPT(rr, &g->ctx, 0, b, sz); } \
668 static const grops grops_##rr = \
669 { SALSA20_NONCESZ, gr_seek, gr_tell, \
670 gr_setnonce, gr_generate_##rr }; \
672 static const grand_ops grops_rand_##rr = { \
673 SALSA20_NAME_##rr, GRAND_CRYPTO, 0, \
674 grmisc, grdestroy, grword, \
675 grbyte, grword, grand_range, grfill \
678 grand *SALSA20_DECOR(salsa20, rr, _rand) \
679 (const void *k, size_t ksz, const void *n) \
681 grctx *g = S_CREATE(g); \
682 g->r.r.ops = &grops_rand_##rr; \
683 g->r.ops = &grops_##rr; \
684 salsa20_init(&g->ctx, k, ksz, n); \
687 SALSA20_VARS(DEFGRAND
)
689 #define DEFXGRAND(rr) \
691 typedef struct grxctx_##rr { \
693 XSALSA20_CTX(rr) ctx; \
696 static void grx_seek_##rr(void *r, kludge64 pos) \
697 { grxctx_##rr *g = r; XSALSA20_SEEKU64(rr, &g->ctx, pos); } \
699 static kludge64 grx_tell_##rr(void *r) \
700 { grxctx_##rr *g = r; return (XSALSA20_TELLU64(rr, &g->ctx)); } \
702 static void grx_setnonce_##rr(void *r, const void *n) \
703 { grxctx_##rr *g = r; XSALSA20_SETNONCE(rr, &g->ctx, n); } \
705 static void grxdestroy_##rr(grand *r) \
706 { grxctx_##rr *g = (grxctx_##rr *)r; BURN(*g); S_DESTROY(g); } \
708 static void grx_generate_##rr(void *r, void *b, size_t sz) \
709 { grxctx_##rr *g = r; XSALSA20_ENCRYPT(rr, &g->ctx, 0, b, sz); } \
711 static const grops grxops_##rr = \
712 { XSALSA20_NONCESZ, grx_seek_##rr, grx_tell_##rr, \
713 grx_setnonce_##rr, grx_generate_##rr }; \
715 static const grand_ops grxops_rand_##rr = { \
716 "x" SALSA20_NAME_##rr, GRAND_CRYPTO, 0, \
717 grmisc, grxdestroy_##rr, grword, \
718 grbyte, grword, grand_range, grfill \
721 grand *SALSA20_DECOR(xsalsa20, rr, _rand) \
722 (const void *k, size_t ksz, const void *n) \
724 grxctx_##rr *g = S_CREATE(g); \
725 g->r.r.ops = &grxops_rand_##rr; \
726 g->r.ops = &grxops_##rr; \
727 XSALSA20_INIT(rr, &g->ctx, k, ksz, n); \
730 SALSA20_VARS(DEFXGRAND
)
732 /*----- Test rig ----------------------------------------------------------*/
739 #include <mLib/quis.h>
740 #include <mLib/testrig.h>
742 static const int perm
[] = {
749 #define DEFVCORE(r) \
750 static int v_core_##r(dstr *v) \
752 salsa20_matrix a, b; \
753 dstr d = DSTR_INIT; \
757 DENSURE(&d, SALSA20_OUTSZ); d.len = SALSA20_OUTSZ; \
758 n = *(int *)v[0].buf; \
759 for (i = 0; i < SALSA20_OUTSZ/4; i++) \
760 b[i] = LOAD32_L(v[1].buf + 4*i); \
761 for (i = 0; i < n; i++) { \
762 for (j = 0; j < 16; j++) a[perm[j]] = b[j]; \
764 memcpy(a, b, sizeof(a)); \
766 for (i = 0; i < SALSA20_OUTSZ/4; i++) STORE32_L(d.buf + 4*i, b[i]); \
768 if (d.len != v[2].len || memcmp(d.buf, v[2].buf, v[2].len) != 0) { \
770 printf("\nfail core:" \
771 "\n\titerations = %d" \
773 type_hex.dump(&v[1], stdout); \
774 printf("\n\texpected = "); \
775 type_hex.dump(&v[2], stdout); \
776 printf("\n\tcalculated = "); \
777 type_hex.dump(&d, stdout); \
784 SALSA20_VARS(DEFVCORE
)
786 #define SALSA20_CTX(r) salsa20_ctx
787 #define SALSA20_INIT(r, ctx, k, ksz, n) salsa20_init(ctx, k, ksz, n)
788 #define SALSA20_SEEKU64(r, ctx, i) salsa20_seeku64(ctx, i)
790 #define DEFxVENC(base, BASE, r) \
791 static int v_encrypt_##base##_##r(dstr *v) \
794 dstr d = DSTR_INIT; \
796 const octet *p, *p0; \
798 size_t sz, sz0, step; \
799 unsigned long skip; \
802 if (v[4].len) { p0 = (const octet *)v[4].buf; sz0 = v[4].len; } \
803 else { p0 = 0; sz0 = v[5].len; } \
804 DENSURE(&d, sz0); d.len = sz0; \
805 skip = *(unsigned long *)v[3].buf; \
808 while (step < sz0 + skip) { \
809 step = step ? 3*step + 4 : 1; \
810 if (step > sz0 + skip) step = sz0 + skip; \
811 BASE##_INIT(r, &ctx, v[0].buf, v[0].len, v[1].buf); \
813 LOAD64_(pos, v[2].buf); \
814 BASE##_SEEKU64(r, &ctx, pos); \
817 for (sz = skip; sz >= step; sz -= step) \
818 BASE##_ENCRYPT(r, &ctx, 0, 0, step); \
819 if (sz) BASE##_ENCRYPT(r, &ctx, 0, 0, sz); \
820 for (p = p0, q = (octet *)d.buf, sz = sz0; \
822 sz -= step, q += step) { \
823 BASE##_ENCRYPT(r, &ctx, p, q, step); \
826 if (sz) BASE##_ENCRYPT(r, &ctx, p, q, sz); \
828 if (d.len != v[5].len || memcmp(d.buf, v[5].buf, v[5].len) != 0) { \
830 printf("\nfail encrypt:" \
832 "\n\tkey = ", (unsigned long)step); \
833 type_hex.dump(&v[0], stdout); \
834 printf("\n\tnonce = "); \
835 type_hex.dump(&v[1], stdout); \
836 printf("\n\tposition = "); \
837 type_hex.dump(&v[2], stdout); \
838 printf("\n\tskip = %lu", skip); \
839 printf("\n\tmessage = "); \
840 type_hex.dump(&v[4], stdout); \
841 printf("\n\texpected = "); \
842 type_hex.dump(&v[5], stdout); \
843 printf("\n\tcalculated = "); \
844 type_hex.dump(&d, stdout); \
852 #define DEFVENC(r) DEFxVENC(salsa20, SALSA20, r)
853 #define DEFXVENC(r) DEFxVENC(xsalsa20, XSALSA20, r)
854 SALSA20_VARS(DEFVENC
)
855 SALSA20_VARS(DEFXVENC
)
857 static test_chunk defs
[] = {
858 #define DEFxTAB(pre, base, r) \
859 { pre SALSA20_NAME_##r, v_encrypt_##base##_##r, \
860 { &type_hex, &type_hex, &type_hex, &type_ulong, \
861 &type_hex, &type_hex, 0 } },
863 { SALSA20_NAME_##r "-core", v_core_##r, \
864 { &type_int, &type_hex, &type_hex, 0 } }, \
865 DEFxTAB("", salsa20, r)
866 #define DEFXTAB(r) DEFxTAB("x", xsalsa20, r)
868 SALSA20_VARS(DEFXTAB
)
872 int main(int argc
, char *argv
[])
874 test_run(argc
, argv
, defs
, SRCDIR
"/t/salsa20");
880 /*----- That's all, folks -------------------------------------------------*/