Line data Source code
1 : /* salsa20.c - Bernstein's Salsa20 cipher
2 : * Copyright (C) 2012 Simon Josefsson, Niels Möller
3 : * Copyright (C) 2013 g10 Code GmbH
4 : *
5 : * This file is part of Libgcrypt.
6 : *
7 : * Libgcrypt is free software; you can redistribute it and/or modify
8 : * it under the terms of the GNU Lesser general Public License as
9 : * published by the Free Software Foundation; either version 2.1 of
10 : * the License, or (at your option) any later version.
11 : *
12 : * Libgcrypt is distributed in the hope that it will be useful,
13 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 : * GNU Lesser General Public License for more details.
16 : *
17 : * You should have received a copy of the GNU Lesser General Public
18 : * License along with this program; if not, see <http://www.gnu.org/licenses/>.
19 : *
20 : * For a description of the algorithm, see:
21 : * http://cr.yp.to/snuffle/spec.pdf
22 : * http://cr.yp.to/snuffle/design.pdf
23 : */
24 :
25 : /* The code is based on the code in Nettle
26 : (git commit id 9d2d8ddaee35b91a4e1a32ae77cba04bea3480e7)
27 : which in turn is based on
28 : salsa20-ref.c version 20051118
29 : D. J. Bernstein
30 : Public domain.
31 : */
32 :
33 :
34 : #include <config.h>
35 : #include <stdio.h>
36 : #include <stdlib.h>
37 : #include <string.h>
38 : #include "types.h"
39 : #include "g10lib.h"
40 : #include "cipher.h"
41 : #include "bufhelp.h"
42 :
43 :
44 : /* USE_AMD64 indicates whether to compile with AMD64 code. */
45 : #undef USE_AMD64
46 : #if defined(__x86_64__) && (defined(HAVE_COMPATIBLE_GCC_AMD64_PLATFORM_AS) || \
47 : defined(HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS))
48 : # define USE_AMD64 1
49 : #endif
50 :
51 : /* USE_ARM_NEON_ASM indicates whether to enable ARM NEON assembly code. */
52 : #undef USE_ARM_NEON_ASM
53 : #ifdef ENABLE_NEON_SUPPORT
54 : # if defined(HAVE_ARM_ARCH_V6) && defined(__ARMEL__) \
55 : && defined(HAVE_COMPATIBLE_GCC_ARM_PLATFORM_AS) \
56 : && defined(HAVE_GCC_INLINE_ASM_NEON)
57 : # define USE_ARM_NEON_ASM 1
58 : # endif
59 : #endif /*ENABLE_NEON_SUPPORT*/
60 :
61 :
62 : #define SALSA20_MIN_KEY_SIZE 16 /* Bytes. */
63 : #define SALSA20_MAX_KEY_SIZE 32 /* Bytes. */
64 : #define SALSA20_BLOCK_SIZE 64 /* Bytes. */
65 : #define SALSA20_IV_SIZE 8 /* Bytes. */
66 : #define SALSA20_INPUT_LENGTH 16 /* Bytes. */
67 :
68 : /* Number of rounds. The standard uses 20 rounds. In any case the
69 : number of rounds must be even. */
70 : #define SALSA20_ROUNDS 20
71 : #define SALSA20R12_ROUNDS 12
72 :
73 :
74 : struct SALSA20_context_s;
75 :
76 : typedef unsigned int (*salsa20_core_t) (u32 *dst, struct SALSA20_context_s *ctx,
77 : unsigned int rounds);
78 : typedef void (* salsa20_keysetup_t)(struct SALSA20_context_s *ctx,
79 : const byte *key, int keylen);
80 : typedef void (* salsa20_ivsetup_t)(struct SALSA20_context_s *ctx,
81 : const byte *iv);
82 :
83 : typedef struct SALSA20_context_s
84 : {
85 : /* Indices 1-4 and 11-14 holds the key (two identical copies for the
86 : shorter key size), indices 0, 5, 10, 15 are constant, indices 6, 7
87 : are the IV, and indices 8, 9 are the block counter:
88 :
89 : C K K K
90 : K C I I
91 : B B C K
92 : K K K C
93 : */
94 : u32 input[SALSA20_INPUT_LENGTH];
95 : u32 pad[SALSA20_INPUT_LENGTH];
96 : unsigned int unused; /* bytes in the pad. */
97 : #ifdef USE_ARM_NEON_ASM
98 : int use_neon;
99 : #endif
100 : salsa20_keysetup_t keysetup;
101 : salsa20_ivsetup_t ivsetup;
102 : salsa20_core_t core;
103 : } SALSA20_context_t;
104 :
105 :
106 : /* The masking of the right shift is needed to allow n == 0 (using
107 : just 32 - n and 64 - n results in undefined behaviour). Most uses
108 : of these macros use a constant and non-zero rotation count. */
109 : #define ROTL32(n,x) (((x)<<(n)) | ((x)>>((-(n)&31))))
110 :
111 :
112 : #define LE_SWAP32(v) le_bswap32(v)
113 :
114 : #define LE_READ_UINT32(p) buf_get_le32(p)
115 :
116 :
117 : static void salsa20_setiv (void *context, const byte *iv, size_t ivlen);
118 : static const char *selftest (void);
119 :
120 :
121 : #ifdef USE_AMD64
122 :
123 : /* Assembly implementations use SystemV ABI, ABI conversion and additional
124 : * stack to store XMM6-XMM15 needed on Win64. */
125 : #ifdef HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS
126 : # define ASM_FUNC_ABI __attribute__((sysv_abi))
127 : # define ASM_EXTRA_STACK (10 * 16)
128 : #else
129 : # define ASM_FUNC_ABI
130 : # define ASM_EXTRA_STACK 0
131 : #endif
132 :
133 : /* AMD64 assembly implementations of Salsa20. */
134 : void _gcry_salsa20_amd64_keysetup(u32 *ctxinput, const void *key, int keybits)
135 : ASM_FUNC_ABI;
136 : void _gcry_salsa20_amd64_ivsetup(u32 *ctxinput, const void *iv)
137 : ASM_FUNC_ABI;
138 : unsigned int
139 : _gcry_salsa20_amd64_encrypt_blocks(u32 *ctxinput, const void *src, void *dst,
140 : size_t len, int rounds) ASM_FUNC_ABI;
141 :
142 : static void
143 232 : salsa20_keysetup(SALSA20_context_t *ctx, const byte *key, int keylen)
144 : {
145 232 : _gcry_salsa20_amd64_keysetup(ctx->input, key, keylen * 8);
146 232 : }
147 :
148 : static void
149 392 : salsa20_ivsetup(SALSA20_context_t *ctx, const byte *iv)
150 : {
151 392 : _gcry_salsa20_amd64_ivsetup(ctx->input, iv);
152 392 : }
153 :
154 : static unsigned int
155 10281 : salsa20_core (u32 *dst, SALSA20_context_t *ctx, unsigned int rounds)
156 : {
157 10281 : memset(dst, 0, SALSA20_BLOCK_SIZE);
158 10281 : return _gcry_salsa20_amd64_encrypt_blocks(ctx->input, dst, dst, 1, rounds)
159 20562 : + ASM_EXTRA_STACK;
160 : }
161 :
162 : #else /* USE_AMD64 */
163 :
164 :
165 :
166 : #if 0
167 : # define SALSA20_CORE_DEBUG(i) do { \
168 : unsigned debug_j; \
169 : for (debug_j = 0; debug_j < 16; debug_j++) \
170 : { \
171 : if (debug_j == 0) \
172 : fprintf(stderr, "%2d:", (i)); \
173 : else if (debug_j % 4 == 0) \
174 : fprintf(stderr, "\n "); \
175 : fprintf(stderr, " %8x", pad[debug_j]); \
176 : } \
177 : fprintf(stderr, "\n"); \
178 : } while (0)
179 : #else
180 : # define SALSA20_CORE_DEBUG(i)
181 : #endif
182 :
183 : #define QROUND(x0, x1, x2, x3) \
184 : do { \
185 : x1 ^= ROTL32 ( 7, x0 + x3); \
186 : x2 ^= ROTL32 ( 9, x1 + x0); \
187 : x3 ^= ROTL32 (13, x2 + x1); \
188 : x0 ^= ROTL32 (18, x3 + x2); \
189 : } while(0)
190 :
191 : static unsigned int
192 : salsa20_core (u32 *dst, SALSA20_context_t *ctx, unsigned rounds)
193 : {
194 : u32 pad[SALSA20_INPUT_LENGTH], *src = ctx->input;
195 : unsigned int i;
196 :
197 : memcpy (pad, src, sizeof(pad));
198 : for (i = 0; i < rounds; i += 2)
199 : {
200 : SALSA20_CORE_DEBUG (i);
201 : QROUND (pad[0], pad[4], pad[8], pad[12]);
202 : QROUND (pad[5], pad[9], pad[13], pad[1] );
203 : QROUND (pad[10], pad[14], pad[2], pad[6] );
204 : QROUND (pad[15], pad[3], pad[7], pad[11]);
205 :
206 : SALSA20_CORE_DEBUG (i+1);
207 : QROUND (pad[0], pad[1], pad[2], pad[3] );
208 : QROUND (pad[5], pad[6], pad[7], pad[4] );
209 : QROUND (pad[10], pad[11], pad[8], pad[9] );
210 : QROUND (pad[15], pad[12], pad[13], pad[14]);
211 : }
212 : SALSA20_CORE_DEBUG (i);
213 :
214 : for (i = 0; i < SALSA20_INPUT_LENGTH; i++)
215 : {
216 : u32 t = pad[i] + src[i];
217 : dst[i] = LE_SWAP32 (t);
218 : }
219 :
220 : /* Update counter. */
221 : if (!++src[8])
222 : src[9]++;
223 :
224 : /* burn_stack */
225 : return ( 3*sizeof (void*) \
226 : + 2*sizeof (void*) \
227 : + 64 \
228 : + sizeof (unsigned int) \
229 : + sizeof (u32) );
230 : }
231 : #undef QROUND
232 : #undef SALSA20_CORE_DEBUG
233 :
234 : static void
235 : salsa20_keysetup(SALSA20_context_t *ctx, const byte *key, int keylen)
236 : {
237 : /* These constants are the little endian encoding of the string
238 : "expand 32-byte k". For the 128 bit variant, the "32" in that
239 : string will be fixed up to "16". */
240 : ctx->input[0] = 0x61707865; /* "apxe" */
241 : ctx->input[5] = 0x3320646e; /* "3 dn" */
242 : ctx->input[10] = 0x79622d32; /* "yb-2" */
243 : ctx->input[15] = 0x6b206574; /* "k et" */
244 :
245 : ctx->input[1] = LE_READ_UINT32(key + 0);
246 : ctx->input[2] = LE_READ_UINT32(key + 4);
247 : ctx->input[3] = LE_READ_UINT32(key + 8);
248 : ctx->input[4] = LE_READ_UINT32(key + 12);
249 : if (keylen == SALSA20_MAX_KEY_SIZE) /* 256 bits */
250 : {
251 : ctx->input[11] = LE_READ_UINT32(key + 16);
252 : ctx->input[12] = LE_READ_UINT32(key + 20);
253 : ctx->input[13] = LE_READ_UINT32(key + 24);
254 : ctx->input[14] = LE_READ_UINT32(key + 28);
255 : }
256 : else /* 128 bits */
257 : {
258 : ctx->input[11] = ctx->input[1];
259 : ctx->input[12] = ctx->input[2];
260 : ctx->input[13] = ctx->input[3];
261 : ctx->input[14] = ctx->input[4];
262 :
263 : ctx->input[5] -= 0x02000000; /* Change to "1 dn". */
264 : ctx->input[10] += 0x00000004; /* Change to "yb-6". */
265 : }
266 : }
267 :
268 : static void salsa20_ivsetup(SALSA20_context_t *ctx, const byte *iv)
269 : {
270 : ctx->input[6] = LE_READ_UINT32(iv + 0);
271 : ctx->input[7] = LE_READ_UINT32(iv + 4);
272 : /* Reset the block counter. */
273 : ctx->input[8] = 0;
274 : ctx->input[9] = 0;
275 : }
276 :
277 : #endif /*!USE_AMD64*/
278 :
279 : #ifdef USE_ARM_NEON_ASM
280 :
281 : /* ARM NEON implementation of Salsa20. */
282 : unsigned int
283 : _gcry_arm_neon_salsa20_encrypt(void *c, const void *m, unsigned int nblks,
284 : void *k, unsigned int rounds);
285 :
286 : static unsigned int
287 : salsa20_core_neon (u32 *dst, SALSA20_context_t *ctx, unsigned int rounds)
288 : {
289 : return _gcry_arm_neon_salsa20_encrypt(dst, NULL, 1, ctx->input, rounds);
290 : }
291 :
292 : static void salsa20_ivsetup_neon(SALSA20_context_t *ctx, const byte *iv)
293 : {
294 : memcpy(ctx->input + 8, iv, 8);
295 : /* Reset the block counter. */
296 : memset(ctx->input + 10, 0, 8);
297 : }
298 :
299 : static void
300 : salsa20_keysetup_neon(SALSA20_context_t *ctx, const byte *key, int klen)
301 : {
302 : static const unsigned char sigma32[16] = "expand 32-byte k";
303 : static const unsigned char sigma16[16] = "expand 16-byte k";
304 :
305 : if (klen == 16)
306 : {
307 : memcpy (ctx->input, key, 16);
308 : memcpy (ctx->input + 4, key, 16); /* Duplicate 128-bit key. */
309 : memcpy (ctx->input + 12, sigma16, 16);
310 : }
311 : else
312 : {
313 : /* 32-byte key */
314 : memcpy (ctx->input, key, 32);
315 : memcpy (ctx->input + 12, sigma32, 16);
316 : }
317 : }
318 :
319 : #endif /*USE_ARM_NEON_ASM*/
320 :
321 :
322 : static gcry_err_code_t
323 232 : salsa20_do_setkey (SALSA20_context_t *ctx,
324 : const byte *key, unsigned int keylen)
325 : {
326 : static int initialized;
327 : static const char *selftest_failed;
328 :
329 232 : if (!initialized )
330 : {
331 4 : initialized = 1;
332 4 : selftest_failed = selftest ();
333 4 : if (selftest_failed)
334 0 : log_error ("SALSA20 selftest failed (%s)\n", selftest_failed );
335 : }
336 232 : if (selftest_failed)
337 0 : return GPG_ERR_SELFTEST_FAILED;
338 :
339 232 : if (keylen != SALSA20_MIN_KEY_SIZE
340 184 : && keylen != SALSA20_MAX_KEY_SIZE)
341 0 : return GPG_ERR_INV_KEYLEN;
342 :
343 : /* Default ops. */
344 232 : ctx->keysetup = salsa20_keysetup;
345 232 : ctx->ivsetup = salsa20_ivsetup;
346 232 : ctx->core = salsa20_core;
347 :
348 : #ifdef USE_ARM_NEON_ASM
349 : ctx->use_neon = (_gcry_get_hw_features () & HWF_ARM_NEON) != 0;
350 : if (ctx->use_neon)
351 : {
352 : /* Use ARM NEON ops instead. */
353 : ctx->keysetup = salsa20_keysetup_neon;
354 : ctx->ivsetup = salsa20_ivsetup_neon;
355 : ctx->core = salsa20_core_neon;
356 : }
357 : #endif
358 :
359 232 : ctx->keysetup (ctx, key, keylen);
360 :
361 : /* We default to a zero nonce. */
362 232 : salsa20_setiv (ctx, NULL, 0);
363 :
364 232 : return 0;
365 : }
366 :
367 :
368 : static gcry_err_code_t
369 232 : salsa20_setkey (void *context, const byte *key, unsigned int keylen)
370 : {
371 232 : SALSA20_context_t *ctx = (SALSA20_context_t *)context;
372 232 : gcry_err_code_t rc = salsa20_do_setkey (ctx, key, keylen);
373 232 : _gcry_burn_stack (4 + sizeof (void *) + 4 * sizeof (void *));
374 232 : return rc;
375 : }
376 :
377 :
378 : static void
379 392 : salsa20_setiv (void *context, const byte *iv, size_t ivlen)
380 : {
381 392 : SALSA20_context_t *ctx = (SALSA20_context_t *)context;
382 : byte tmp[SALSA20_IV_SIZE];
383 :
384 392 : if (iv && ivlen != SALSA20_IV_SIZE)
385 0 : log_info ("WARNING: salsa20_setiv: bad ivlen=%u\n", (u32)ivlen);
386 :
387 392 : if (!iv || ivlen != SALSA20_IV_SIZE)
388 232 : memset (tmp, 0, sizeof(tmp));
389 : else
390 160 : memcpy (tmp, iv, SALSA20_IV_SIZE);
391 :
392 392 : ctx->ivsetup (ctx, tmp);
393 :
394 : /* Reset the unused pad bytes counter. */
395 392 : ctx->unused = 0;
396 :
397 392 : wipememory (tmp, sizeof(tmp));
398 392 : }
399 :
400 :
401 :
402 : /* Note: This function requires LENGTH > 0. */
403 : static void
404 22722 : salsa20_do_encrypt_stream (SALSA20_context_t *ctx,
405 : byte *outbuf, const byte *inbuf,
406 : size_t length, unsigned rounds)
407 : {
408 22722 : unsigned int nburn, burn = 0;
409 :
410 22722 : if (ctx->unused)
411 : {
412 12341 : unsigned char *p = (void*)ctx->pad;
413 : size_t n;
414 :
415 12341 : gcry_assert (ctx->unused < SALSA20_BLOCK_SIZE);
416 :
417 12341 : n = ctx->unused;
418 12341 : if (n > length)
419 2685 : n = length;
420 12341 : buf_xor (outbuf, inbuf, p + SALSA20_BLOCK_SIZE - ctx->unused, n);
421 12341 : length -= n;
422 12341 : outbuf += n;
423 12341 : inbuf += n;
424 12341 : ctx->unused -= n;
425 12341 : if (!length)
426 2865 : return;
427 9476 : gcry_assert (!ctx->unused);
428 : }
429 :
430 : #ifdef USE_AMD64
431 19857 : if (length >= SALSA20_BLOCK_SIZE)
432 : {
433 18725 : size_t nblocks = length / SALSA20_BLOCK_SIZE;
434 18725 : burn = _gcry_salsa20_amd64_encrypt_blocks(ctx->input, inbuf, outbuf,
435 : nblocks, rounds);
436 18725 : burn += ASM_EXTRA_STACK;
437 18725 : length -= SALSA20_BLOCK_SIZE * nblocks;
438 18725 : outbuf += SALSA20_BLOCK_SIZE * nblocks;
439 18725 : inbuf += SALSA20_BLOCK_SIZE * nblocks;
440 : }
441 : #endif
442 :
443 : #ifdef USE_ARM_NEON_ASM
444 : if (ctx->use_neon && length >= SALSA20_BLOCK_SIZE)
445 : {
446 : unsigned int nblocks = length / SALSA20_BLOCK_SIZE;
447 : _gcry_arm_neon_salsa20_encrypt (outbuf, inbuf, nblocks, ctx->input,
448 : rounds);
449 : length -= SALSA20_BLOCK_SIZE * nblocks;
450 : outbuf += SALSA20_BLOCK_SIZE * nblocks;
451 : inbuf += SALSA20_BLOCK_SIZE * nblocks;
452 : }
453 : #endif
454 :
455 39714 : while (length > 0)
456 : {
457 : /* Create the next pad and bump the block counter. Note that it
458 : is the user's duty to change to another nonce not later than
459 : after 2^70 processed bytes. */
460 10281 : nburn = ctx->core (ctx->pad, ctx, rounds);
461 10281 : burn = nburn > burn ? nburn : burn;
462 :
463 10281 : if (length <= SALSA20_BLOCK_SIZE)
464 : {
465 10281 : buf_xor (outbuf, inbuf, ctx->pad, length);
466 10281 : ctx->unused = SALSA20_BLOCK_SIZE - length;
467 10281 : break;
468 : }
469 0 : buf_xor (outbuf, inbuf, ctx->pad, SALSA20_BLOCK_SIZE);
470 0 : length -= SALSA20_BLOCK_SIZE;
471 0 : outbuf += SALSA20_BLOCK_SIZE;
472 0 : inbuf += SALSA20_BLOCK_SIZE;
473 : }
474 :
475 19857 : _gcry_burn_stack (burn);
476 : }
477 :
478 :
479 : static void
480 11136 : salsa20_encrypt_stream (void *context,
481 : byte *outbuf, const byte *inbuf, size_t length)
482 : {
483 11136 : SALSA20_context_t *ctx = (SALSA20_context_t *)context;
484 :
485 11136 : if (length)
486 11136 : salsa20_do_encrypt_stream (ctx, outbuf, inbuf, length, SALSA20_ROUNDS);
487 11136 : }
488 :
489 :
490 : static void
491 11586 : salsa20r12_encrypt_stream (void *context,
492 : byte *outbuf, const byte *inbuf, size_t length)
493 : {
494 11586 : SALSA20_context_t *ctx = (SALSA20_context_t *)context;
495 :
496 11586 : if (length)
497 11586 : salsa20_do_encrypt_stream (ctx, outbuf, inbuf, length, SALSA20R12_ROUNDS);
498 11586 : }
499 :
500 :
501 : static const char*
502 4 : selftest (void)
503 : {
504 : byte ctxbuf[sizeof(SALSA20_context_t) + 15];
505 : SALSA20_context_t *ctx;
506 : byte scratch[8+1];
507 : byte buf[256+64+4];
508 : int i;
509 :
510 : static byte key_1[] =
511 : { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
512 : 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
513 : 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
514 : 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
515 : static const byte nonce_1[] =
516 : { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
517 : static const byte plaintext_1[] =
518 : { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
519 : static const byte ciphertext_1[] =
520 : { 0xE3, 0xBE, 0x8F, 0xDD, 0x8B, 0xEC, 0xA2, 0xE3};
521 :
522 : /* 16-byte alignment required for amd64 implementation. */
523 4 : ctx = (SALSA20_context_t *)((uintptr_t)(ctxbuf + 15) & ~(uintptr_t)15);
524 :
525 4 : salsa20_setkey (ctx, key_1, sizeof key_1);
526 4 : salsa20_setiv (ctx, nonce_1, sizeof nonce_1);
527 4 : scratch[8] = 0;
528 4 : salsa20_encrypt_stream (ctx, scratch, plaintext_1, sizeof plaintext_1);
529 4 : if (memcmp (scratch, ciphertext_1, sizeof ciphertext_1))
530 0 : return "Salsa20 encryption test 1 failed.";
531 4 : if (scratch[8])
532 0 : return "Salsa20 wrote too much.";
533 4 : salsa20_setkey( ctx, key_1, sizeof(key_1));
534 4 : salsa20_setiv (ctx, nonce_1, sizeof nonce_1);
535 4 : salsa20_encrypt_stream (ctx, scratch, scratch, sizeof plaintext_1);
536 4 : if (memcmp (scratch, plaintext_1, sizeof plaintext_1))
537 0 : return "Salsa20 decryption test 1 failed.";
538 :
539 1300 : for (i = 0; i < sizeof buf; i++)
540 1296 : buf[i] = i;
541 4 : salsa20_setkey (ctx, key_1, sizeof key_1);
542 4 : salsa20_setiv (ctx, nonce_1, sizeof nonce_1);
543 : /*encrypt*/
544 4 : salsa20_encrypt_stream (ctx, buf, buf, sizeof buf);
545 : /*decrypt*/
546 4 : salsa20_setkey (ctx, key_1, sizeof key_1);
547 4 : salsa20_setiv (ctx, nonce_1, sizeof nonce_1);
548 4 : salsa20_encrypt_stream (ctx, buf, buf, 1);
549 4 : salsa20_encrypt_stream (ctx, buf+1, buf+1, (sizeof buf)-1-1);
550 4 : salsa20_encrypt_stream (ctx, buf+(sizeof buf)-1, buf+(sizeof buf)-1, 1);
551 1300 : for (i = 0; i < sizeof buf; i++)
552 1296 : if (buf[i] != (byte)i)
553 0 : return "Salsa20 encryption test 2 failed.";
554 :
555 4 : return NULL;
556 : }
557 :
558 :
559 : gcry_cipher_spec_t _gcry_cipher_spec_salsa20 =
560 : {
561 : GCRY_CIPHER_SALSA20,
562 : {0, 0}, /* flags */
563 : "SALSA20", /* name */
564 : NULL, /* aliases */
565 : NULL, /* oids */
566 : 1, /* blocksize in bytes. */
567 : SALSA20_MAX_KEY_SIZE*8, /* standard key length in bits. */
568 : sizeof (SALSA20_context_t),
569 : salsa20_setkey,
570 : NULL,
571 : NULL,
572 : salsa20_encrypt_stream,
573 : salsa20_encrypt_stream,
574 : NULL,
575 : NULL,
576 : salsa20_setiv
577 : };
578 :
579 : gcry_cipher_spec_t _gcry_cipher_spec_salsa20r12 =
580 : {
581 : GCRY_CIPHER_SALSA20R12,
582 : {0, 0}, /* flags */
583 : "SALSA20R12", /* name */
584 : NULL, /* aliases */
585 : NULL, /* oids */
586 : 1, /* blocksize in bytes. */
587 : SALSA20_MAX_KEY_SIZE*8, /* standard key length in bits. */
588 : sizeof (SALSA20_context_t),
589 : salsa20_setkey,
590 : NULL,
591 : NULL,
592 : salsa20r12_encrypt_stream,
593 : salsa20r12_encrypt_stream,
594 : NULL,
595 : NULL,
596 : salsa20_setiv
597 : };
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