Commit | Line | Data |
---|---|---|
194e93f2 MW |
1 | /* -*-c-*- |
2 | * | |
3 | * Salsa20 stream cipher | |
4 | * | |
5 | * (c) 2015 Straylight/Edgeware | |
6 | */ | |
7 | ||
8 | /*----- Header files ------------------------------------------------------*/ | |
9 | ||
e10e6494 MW |
10 | #include "config.h" |
11 | ||
194e93f2 MW |
12 | #include <stdarg.h> |
13 | ||
14 | #include <mLib/bits.h> | |
15 | ||
16 | #include "arena.h" | |
e10e6494 | 17 | #include "dispatch.h" |
194e93f2 MW |
18 | #include "gcipher.h" |
19 | #include "grand.h" | |
20 | #include "keysz.h" | |
21 | #include "paranoia.h" | |
22 | #include "salsa20.h" | |
23 | #include "salsa20-core.h" | |
24 | ||
25 | /*----- Global variables --------------------------------------------------*/ | |
26 | ||
27 | const octet salsa20_keysz[] = { KSZ_SET, 32, 16, 10, 0 }; | |
28 | ||
29 | /*----- The Salsa20 core function and utilities ---------------------------*/ | |
30 | ||
31 | /* --- @core@ --- * | |
32 | * | |
33 | * Arguments: @unsigned r@ = number of rounds | |
34 | * @const salsa20_matrix src@ = input matrix | |
35 | * @salsa20_matrix dest@ = where to put the output | |
36 | * | |
37 | * Returns: --- | |
38 | * | |
39 | * | |
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. | |
43 | */ | |
44 | ||
e10e6494 MW |
45 | CPU_DISPATCH(static, (void), |
46 | void, core, (unsigned r, const salsa20_matrix src, | |
47 | salsa20_matrix dest), | |
48 | (r, src, dest), | |
49 | pick_core, simple_core); | |
50 | ||
51 | static void simple_core(unsigned r, const salsa20_matrix src, | |
52 | salsa20_matrix dest) | |
194e93f2 MW |
53 | { SALSA20_nR(dest, src, r); SALSA20_FFWD(dest, src); } |
54 | ||
e10e6494 MW |
55 | #ifdef CPUFAM_X86 |
56 | extern core__functype salsa20_core_x86_sse2; | |
57 | #endif | |
58 | ||
59 | static core__functype *pick_core(void) | |
60 | { | |
61 | #ifdef CPUFAM_X86 | |
62 | if (cpu_feature_p(CPUFEAT_X86_SSE2)) return salsa20_core_x86_sse2; | |
63 | #endif | |
64 | return simple_core; | |
65 | } | |
66 | ||
194e93f2 MW |
67 | /* --- @populate@ --- * |
68 | * | |
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 | |
72 | * | |
73 | * Returns: --- | |
74 | * | |
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. | |
78 | */ | |
79 | ||
80 | static void populate(salsa20_matrix a, const void *key, size_t ksz) | |
81 | { | |
82 | const octet *k = key; | |
83 | ||
84 | KSZ_ASSERT(salsa20, ksz); | |
85 | ||
a4c2e267 MW |
86 | /* Here's the pattern of key, constant, nonce, and counter pieces in the |
87 | * matrix, before and after our permutation. | |
88 | * | |
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 ] | |
93 | */ | |
94 | ||
95 | a[13] = LOAD32_L(k + 0); | |
96 | a[10] = LOAD32_L(k + 4); | |
194e93f2 | 97 | if (ksz == 10) { |
a4c2e267 | 98 | a[ 7] = LOAD16_L(k + 8); |
194e93f2 MW |
99 | a[ 4] = 0; |
100 | } else { | |
a4c2e267 | 101 | a[ 7] = LOAD32_L(k + 8); |
194e93f2 MW |
102 | a[ 4] = LOAD32_L(k + 12); |
103 | } | |
104 | if (ksz <= 16) { | |
a4c2e267 MW |
105 | a[15] = a[13]; |
106 | a[12] = a[10]; | |
107 | a[ 9] = a[ 7]; | |
108 | a[ 6] = a[ 4]; | |
194e93f2 | 109 | a[ 0] = SALSA20_A128; |
a4c2e267 MW |
110 | a[ 1] = SALSA20_B128; |
111 | a[ 2] = ksz == 10 ? SALSA20_C80 : SALSA20_C128; | |
112 | a[ 3] = SALSA20_D128; | |
194e93f2 | 113 | } else { |
a4c2e267 | 114 | a[15] = LOAD32_L(k + 16); |
194e93f2 | 115 | a[12] = LOAD32_L(k + 20); |
a4c2e267 MW |
116 | a[ 9] = LOAD32_L(k + 24); |
117 | a[ 6] = LOAD32_L(k + 28); | |
194e93f2 | 118 | a[ 0] = SALSA20_A256; |
a4c2e267 MW |
119 | a[ 1] = SALSA20_B256; |
120 | a[ 2] = SALSA20_C256; | |
121 | a[ 3] = SALSA20_D256; | |
194e93f2 MW |
122 | } |
123 | } | |
124 | ||
125 | /*----- Salsa20 implementation --------------------------------------------*/ | |
126 | ||
127 | /* --- @salsa20_init@ --- * | |
128 | * | |
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 | |
133 | * | |
134 | * Returns: --- | |
135 | * | |
136 | * Use: Initializes a Salsa20 context ready for use. | |
137 | */ | |
138 | ||
139 | void salsa20_init(salsa20_ctx *ctx, const void *key, size_t ksz, | |
140 | const void *nonce) | |
141 | { | |
142 | static const octet zerononce[SALSA20_NONCESZ]; | |
143 | ||
144 | populate(ctx->a, key, ksz); | |
145 | salsa20_setnonce(ctx, nonce ? nonce : zerononce); | |
146 | } | |
147 | ||
148 | /* --- @salsa20_setnonce@ --- * | |
149 | * | |
150 | * Arguments: @salsa20_ctx *ctx@ = pointer to context | |
151 | * @const void *nonce@ = the nonce (@SALSA20_NONCESZ@ bytes) | |
152 | * | |
153 | * Returns: --- | |
154 | * | |
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.). | |
158 | */ | |
159 | ||
160 | void salsa20_setnonce(salsa20_ctx *ctx, const void *nonce) | |
161 | { | |
162 | const octet *n = nonce; | |
163 | ||
a4c2e267 MW |
164 | ctx->a[14] = LOAD32_L(n + 0); |
165 | ctx->a[11] = LOAD32_L(n + 4); | |
194e93f2 MW |
166 | salsa20_seek(ctx, 0); |
167 | } | |
168 | ||
169 | /* --- @salsa20_seek@, @salsa20_seeku64@ --- * | |
170 | * | |
171 | * Arguments: @salsa20_ctx *ctx@ = pointer to context | |
172 | * @unsigned long i@, @kludge64 i@ = new position to set | |
173 | * | |
174 | * Returns: --- | |
175 | * | |
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@ | |
179 | * appropriately. | |
180 | */ | |
181 | ||
182 | void salsa20_seek(salsa20_ctx *ctx, unsigned long i) | |
183 | { kludge64 ii; ASSIGN64(ii, i); salsa20_seeku64(ctx, ii); } | |
184 | ||
185 | void salsa20_seeku64(salsa20_ctx *ctx, kludge64 i) | |
186 | { | |
a4c2e267 | 187 | ctx->a[8] = LO64(i); ctx->a[5] = HI64(i); |
194e93f2 MW |
188 | ctx->bufi = SALSA20_OUTSZ; |
189 | } | |
190 | ||
191 | /* --- @salsa20_tell@, @salsa20_tellu64@ --- * | |
192 | * | |
193 | * Arguments: @salsa20_ctx *ctx@ = pointer to context | |
194 | * | |
195 | * Returns: The current position in the output stream, in blocks, | |
196 | * rounding upwards. | |
197 | */ | |
198 | ||
199 | unsigned long salsa20_tell(salsa20_ctx *ctx) | |
200 | { kludge64 i = salsa20_tellu64(ctx); return (GET64(unsigned long, i)); } | |
201 | ||
202 | kludge64 salsa20_tellu64(salsa20_ctx *ctx) | |
a4c2e267 | 203 | { kludge64 i; SET64(i, ctx->a[5], ctx->a[8]); return (i); } |
194e93f2 MW |
204 | |
205 | /* --- @salsa20{,12,8}_encrypt@ --- * | |
206 | * | |
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 | |
211 | * | |
212 | * Returns: --- | |
213 | * | |
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 | |
219 | * to @dest@. | |
220 | */ | |
221 | ||
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) \ | |
227 | { \ | |
228 | salsa20_matrix b; \ | |
229 | const octet *s = src; \ | |
230 | octet *d = dest; \ | |
231 | size_t n; \ | |
232 | kludge64 pos, delta; \ | |
233 | \ | |
234 | SALSA20_OUTBUF(ctx, d, s, sz); \ | |
235 | if (!sz) return; \ | |
236 | \ | |
237 | if (!dest) { \ | |
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; \ | |
244 | } else if (!src) { \ | |
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; \ | |
250 | } \ | |
251 | } else { \ | |
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; \ | |
257 | } \ | |
258 | } \ | |
259 | \ | |
260 | if (sz) { \ | |
261 | core(r, ctx->a, b); \ | |
262 | SALSA20_STEP(ctx->a); \ | |
263 | SALSA20_PREPBUF(ctx, b); \ | |
264 | SALSA20_OUTBUF(ctx, d, s, sz); \ | |
265 | assert(!sz); \ | |
266 | } \ | |
267 | } | |
268 | SALSA20_VARS(DEFENCRYPT) | |
269 | ||
270 | /*----- HSalsa20 implementation -------------------------------------------*/ | |
271 | ||
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) | |
276 | ||
277 | /* --- @hsalsa20{,12,8}_prf@ --- * | |
278 | * | |
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) | |
282 | * | |
283 | * Returns: --- | |
284 | * | |
285 | * Use: Apply the HSalsa20/r pseudorandom function to @src@, writing | |
286 | * the result to @out@. | |
287 | */ | |
288 | ||
289 | #define DEFHSALSA20(r) \ | |
290 | static void HSALSA20_RAW(r, salsa20_matrix k, \ | |
291 | const uint32 *src, uint32 *dest) \ | |
292 | { \ | |
293 | salsa20_matrix a; \ | |
294 | int i; \ | |
295 | \ | |
296 | /* --- HSalsa20, computed from full Salsa20 --- * \ | |
297 | * \ | |
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. \ | |
304 | */ \ | |
305 | \ | |
a4c2e267 | 306 | for (i = 0; i < 4; i++) k[14 - 3*i] = src[i]; \ |
194e93f2 | 307 | core(r, k, a); \ |
a4c2e267 MW |
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]; \ | |
194e93f2 MW |
310 | } \ |
311 | \ | |
312 | void HSALSA20_PRF(r, salsa20_ctx *ctx, const void *src, void *dest) \ | |
313 | { \ | |
314 | const octet *s = src; \ | |
315 | octet *d = dest; \ | |
316 | uint32 in[4], out[8]; \ | |
317 | int i; \ | |
318 | \ | |
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]); \ | |
322 | } | |
323 | SALSA20_VARS(DEFHSALSA20) | |
324 | ||
325 | /*----- XSalsa20 implementation -------------------------------------------*/ | |
326 | ||
327 | /* --- Some convenient macros for naming functions --- * | |
328 | * | |
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. | |
333 | */ | |
334 | ||
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) | |
350 | ||
351 | /* --- @xsalsa20{,12,8}_init@ --- * | |
352 | * | |
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 | |
357 | * | |
358 | * Returns: --- | |
359 | * | |
360 | * Use: Initializes an XSalsa20/r context ready for use. | |
361 | * | |
362 | * There is a different function for each number of rounds, | |
363 | * unlike for plain Salsa20. | |
364 | */ | |
365 | ||
366 | #define DEFXINIT(r) \ | |
367 | void XSALSA20_INIT(r, XSALSA20_CTX(r) *ctx, \ | |
368 | const void *key, size_t ksz, const void *nonce) \ | |
369 | { \ | |
370 | static const octet zerononce[XSALSA20_NONCESZ]; \ | |
371 | \ | |
372 | populate(ctx->k, key, ksz); \ | |
373 | ctx->s.a[ 0] = SALSA20_A256; \ | |
a4c2e267 MW |
374 | ctx->s.a[ 1] = SALSA20_B256; \ |
375 | ctx->s.a[ 2] = SALSA20_C256; \ | |
376 | ctx->s.a[ 3] = SALSA20_D256; \ | |
194e93f2 MW |
377 | XSALSA20_SETNONCE(r, ctx, nonce ? nonce : zerononce); \ |
378 | } | |
379 | SALSA20_VARS(DEFXINIT) | |
380 | ||
381 | /* --- @xsalsa20{,12,8}_setnonce@ --- * | |
382 | * | |
383 | * Arguments: @xsalsa20R_ctx *ctx@ = pointer to context | |
384 | * @const void *nonce@ = the nonce (@XSALSA20_NONCESZ@ bytes) | |
385 | * | |
386 | * Returns: --- | |
387 | * | |
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.). | |
391 | * | |
392 | * There is a different function for each number of rounds, | |
393 | * unlike for plain Salsa20. | |
394 | */ | |
395 | ||
396 | #define DEFXNONCE(r) \ | |
397 | void XSALSA20_SETNONCE(r, XSALSA20_CTX(r) *ctx, const void *nonce) \ | |
398 | { \ | |
399 | const octet *n = nonce; \ | |
400 | uint32 in[4], out[8]; \ | |
401 | int i; \ | |
402 | \ | |
403 | for (i = 0; i < 4; i++) in[i] = LOAD32_L(n + 4*i); \ | |
404 | HSALSA20_RAW(r, ctx->k, in, out); \ | |
a4c2e267 MW |
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]; \ | |
194e93f2 MW |
407 | salsa20_setnonce(&ctx->s, n + 16); \ |
408 | } | |
409 | SALSA20_VARS(DEFXNONCE) | |
410 | ||
411 | /* --- @xsalsa20{,12,8}_seek@, @xsalsa20{,12,8}_seeku64@ --- * | |
412 | * | |
413 | * Arguments: @xsalsa20R_ctx *ctx@ = pointer to context | |
414 | * @unsigned long i@, @kludge64 i@ = new position to set | |
415 | * | |
416 | * Returns: --- | |
417 | * | |
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@ | |
421 | * appropriately. | |
422 | * | |
423 | * There is a different function for each number of rounds, | |
424 | * unlike for plain Salsa20, because the context structures are | |
425 | * different. | |
426 | */ | |
427 | ||
428 | /* --- @xsalsa20{,12,8}_tell@, @xsalsa20{,12,8}_tellu64@ --- * | |
429 | * | |
430 | * Arguments: @salsa20_ctx *ctx@ = pointer to context | |
431 | * | |
432 | * Returns: The current position in the output stream, in blocks, | |
433 | * rounding upwards. | |
434 | * | |
435 | * There is a different function for each number of rounds, | |
436 | * unlike for plain Salsa20, because the context structures are | |
437 | * different. | |
438 | */ | |
439 | ||
440 | /* --- @xsalsa20{,12,8}_encrypt@ --- * | |
441 | * | |
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 | |
446 | * | |
447 | * Returns: --- | |
448 | * | |
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 | |
454 | * to @dest@. | |
455 | */ | |
456 | ||
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) | |
470 | ||
471 | /*----- Generic cipher interface ------------------------------------------*/ | |
472 | ||
473 | typedef struct gctx { gcipher c; salsa20_ctx ctx; } gctx; | |
474 | ||
475 | static void gsetiv(gcipher *c, const void *iv) | |
476 | { gctx *g = (gctx *)c; salsa20_setnonce(&g->ctx, iv); } | |
477 | ||
478 | static void gdestroy(gcipher *c) | |
479 | { gctx *g = (gctx *)c; BURN(*g); S_DESTROY(g); } | |
480 | ||
481 | #define DEFGCIPHER(r) \ | |
482 | \ | |
483 | static const gcipher_ops gops_##r; \ | |
484 | \ | |
485 | static gcipher *ginit_##r(const void *k, size_t sz) \ | |
486 | { \ | |
487 | gctx *g = S_CREATE(gctx); \ | |
488 | g->c.ops = &gops_##r; \ | |
489 | salsa20_init(&g->ctx, k, sz, 0); \ | |
490 | return (&g->c); \ | |
491 | } \ | |
492 | \ | |
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); } \ | |
496 | \ | |
497 | static const gcipher_ops gops_##r = { \ | |
498 | &SALSA20_DECOR(salsa20, r, ), \ | |
499 | gencrypt_##r, gencrypt_##r, gdestroy, gsetiv, 0 \ | |
500 | }; \ | |
501 | \ | |
502 | const gccipher SALSA20_DECOR(salsa20, r, ) = { \ | |
503 | SALSA20_NAME_##r, salsa20_keysz, \ | |
504 | SALSA20_NONCESZ, ginit_##r \ | |
505 | }; | |
506 | ||
507 | SALSA20_VARS(DEFGCIPHER) | |
508 | ||
509 | #define DEFGXCIPHER(r) \ | |
510 | \ | |
511 | typedef struct { gcipher c; XSALSA20_CTX(r) ctx; } gxctx_##r; \ | |
512 | \ | |
513 | static void gxsetiv_##r(gcipher *c, const void *iv) \ | |
514 | { gxctx_##r *g = (gxctx_##r *)c; XSALSA20_SETNONCE(r, &g->ctx, iv); } \ | |
515 | \ | |
516 | static void gxdestroy_##r(gcipher *c) \ | |
517 | { gxctx_##r *g = (gxctx_##r *)c; BURN(*g); S_DESTROY(g); } \ | |
518 | \ | |
519 | static const gcipher_ops gxops_##r; \ | |
520 | \ | |
521 | static gcipher *gxinit_##r(const void *k, size_t sz) \ | |
522 | { \ | |
523 | gxctx_##r *g = S_CREATE(gxctx_##r); \ | |
524 | g->c.ops = &gxops_##r; \ | |
525 | XSALSA20_INIT(r, &g->ctx, k, sz, 0); \ | |
526 | return (&g->c); \ | |
527 | } \ | |
528 | \ | |
529 | static void gxencrypt_##r(gcipher *c, const void *s, \ | |
530 | void *t, size_t sz) \ | |
531 | { \ | |
532 | gxctx_##r *g = (gxctx_##r *)c; \ | |
533 | XSALSA20_ENCRYPT(r, &g->ctx, s, t, sz); \ | |
534 | } \ | |
535 | \ | |
536 | static const gcipher_ops gxops_##r = { \ | |
537 | &SALSA20_DECOR(xsalsa20, r, ), \ | |
538 | gxencrypt_##r, gxencrypt_##r, gxdestroy_##r, gxsetiv_##r, 0 \ | |
539 | }; \ | |
540 | \ | |
541 | const gccipher SALSA20_DECOR(xsalsa20, r, ) = { \ | |
542 | "x" SALSA20_NAME_##r, salsa20_keysz, \ | |
543 | XSALSA20_NONCESZ, gxinit_##r \ | |
544 | }; | |
545 | ||
546 | SALSA20_VARS(DEFGXCIPHER) | |
547 | ||
548 | /*----- Generic random number generator interface -------------------------*/ | |
549 | ||
550 | typedef struct grops { | |
551 | size_t noncesz; | |
552 | void (*seek)(void *, kludge64); | |
553 | kludge64 (*tell)(void *); | |
554 | void (*setnonce)(void *, const void *); | |
555 | void (*generate)(void *, void *, size_t); | |
556 | } grops; | |
557 | ||
558 | typedef struct grbasectx { | |
559 | grand r; | |
560 | const grops *ops; | |
561 | } grbasectx; | |
562 | ||
563 | static int grmisc(grand *r, unsigned op, ...) | |
564 | { | |
565 | octet buf[XSALSA20_NONCESZ]; | |
566 | grbasectx *g = (grbasectx *)r; | |
567 | grand *rr; | |
568 | const octet *p; | |
569 | size_t sz; | |
570 | uint32 i; | |
571 | unsigned long ul; | |
572 | kludge64 pos; | |
573 | va_list ap; | |
574 | int rc = 0; | |
575 | ||
576 | va_start(ap, op); | |
577 | ||
578 | switch (op) { | |
579 | case GRAND_CHECK: | |
580 | switch (va_arg(ap, unsigned)) { | |
581 | case GRAND_CHECK: | |
582 | case GRAND_SEEDINT: | |
583 | case GRAND_SEEDUINT32: | |
584 | case GRAND_SEEDBLOCK: | |
585 | case GRAND_SEEDRAND: | |
586 | case SALSA20_SEEK: | |
587 | case SALSA20_SEEKU64: | |
588 | case SALSA20_TELL: | |
589 | case SALSA20_TELLU64: | |
590 | rc = 1; | |
591 | break; | |
592 | default: | |
593 | rc = 0; | |
594 | break; | |
595 | } | |
596 | break; | |
597 | ||
598 | case GRAND_SEEDINT: | |
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); | |
602 | break; | |
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); | |
607 | break; | |
608 | case GRAND_SEEDBLOCK: | |
609 | p = va_arg(ap, const void *); | |
610 | sz = va_arg(ap, size_t); | |
611 | if (sz < g->ops->noncesz) { | |
612 | memcpy(buf, p, sz); | |
613 | memset(buf + sz, 0, g->ops->noncesz - sz); | |
614 | p = buf; | |
615 | } | |
616 | g->ops->setnonce(g, p); | |
617 | break; | |
618 | case GRAND_SEEDRAND: | |
619 | rr = va_arg(ap, grand *); | |
620 | rr->ops->fill(rr, buf, g->ops->noncesz); | |
621 | g->ops->setnonce(g, buf); | |
622 | break; | |
623 | case SALSA20_SEEK: | |
624 | ul = va_arg(ap, unsigned long); ASSIGN64(pos, ul); | |
625 | g->ops->seek(g, pos); | |
626 | break; | |
627 | case SALSA20_SEEKU64: | |
628 | pos = va_arg(ap, kludge64); | |
629 | g->ops->seek(g, pos); | |
630 | break; | |
631 | case SALSA20_TELL: | |
632 | pos = g->ops->tell(g); | |
633 | *va_arg(ap, unsigned long *) = GET64(unsigned long, pos); | |
634 | break; | |
635 | case SALSA20_TELLU64: | |
636 | *va_arg(ap, kludge64 *) = g->ops->tell(g); | |
637 | break; | |
638 | default: | |
639 | GRAND_BADOP; | |
640 | break; | |
641 | } | |
642 | ||
643 | return (rc); | |
644 | } | |
645 | ||
646 | static octet grbyte(grand *r) | |
647 | { | |
648 | grbasectx *g = (grbasectx *)r; | |
649 | octet o; | |
650 | g->ops->generate(g, &o, 1); | |
651 | return (o); | |
652 | } | |
653 | ||
654 | static uint32 grword(grand *r) | |
655 | { | |
656 | grbasectx *g = (grbasectx *)r; | |
657 | octet b[4]; | |
658 | g->ops->generate(g, b, sizeof(b)); | |
659 | return (LOAD32_L(b)); | |
660 | } | |
661 | ||
662 | static void grfill(grand *r, void *p, size_t sz) | |
663 | { | |
664 | grbasectx *g = (grbasectx *)r; | |
665 | g->ops->generate(r, p, sz); | |
666 | } | |
667 | ||
668 | typedef struct grctx { | |
669 | grbasectx r; | |
670 | salsa20_ctx ctx; | |
671 | } grctx; | |
672 | ||
673 | static void gr_seek(void *r, kludge64 pos) | |
674 | { grctx *g = r; salsa20_seeku64(&g->ctx, pos); } | |
675 | ||
676 | static kludge64 gr_tell(void *r) | |
677 | { grctx *g = r; return (salsa20_tellu64(&g->ctx)); } | |
678 | ||
679 | static void gr_setnonce(void *r, const void *n) | |
680 | { grctx *g = r; salsa20_setnonce(&g->ctx, n); } | |
681 | ||
682 | static void grdestroy(grand *r) | |
683 | { grctx *g = (grctx *)r; BURN(*g); S_DESTROY(g); } | |
684 | ||
685 | #define DEFGRAND(rr) \ | |
686 | \ | |
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); } \ | |
689 | \ | |
690 | static const grops grops_##rr = \ | |
691 | { SALSA20_NONCESZ, gr_seek, gr_tell, \ | |
692 | gr_setnonce, gr_generate_##rr }; \ | |
693 | \ | |
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 \ | |
698 | }; \ | |
699 | \ | |
700 | grand *SALSA20_DECOR(salsa20, rr, _rand) \ | |
701 | (const void *k, size_t ksz, const void *n) \ | |
702 | { \ | |
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); \ | |
707 | return (&g->r.r); \ | |
708 | } | |
709 | SALSA20_VARS(DEFGRAND) | |
710 | ||
711 | #define DEFXGRAND(rr) \ | |
712 | \ | |
713 | typedef struct grxctx_##rr { \ | |
714 | grbasectx r; \ | |
715 | XSALSA20_CTX(rr) ctx; \ | |
716 | } grxctx_##rr; \ | |
717 | \ | |
718 | static void grx_seek_##rr(void *r, kludge64 pos) \ | |
719 | { grxctx_##rr *g = r; XSALSA20_SEEKU64(rr, &g->ctx, pos); } \ | |
720 | \ | |
721 | static kludge64 grx_tell_##rr(void *r) \ | |
722 | { grxctx_##rr *g = r; return (XSALSA20_TELLU64(rr, &g->ctx)); } \ | |
723 | \ | |
724 | static void grx_setnonce_##rr(void *r, const void *n) \ | |
725 | { grxctx_##rr *g = r; XSALSA20_SETNONCE(rr, &g->ctx, n); } \ | |
726 | \ | |
727 | static void grxdestroy_##rr(grand *r) \ | |
728 | { grxctx_##rr *g = (grxctx_##rr *)r; BURN(*g); S_DESTROY(g); } \ | |
729 | \ | |
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); } \ | |
732 | \ | |
733 | static const grops grxops_##rr = \ | |
734 | { XSALSA20_NONCESZ, grx_seek_##rr, grx_tell_##rr, \ | |
735 | grx_setnonce_##rr, grx_generate_##rr }; \ | |
736 | \ | |
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 \ | |
741 | }; \ | |
742 | \ | |
743 | grand *SALSA20_DECOR(xsalsa20, rr, _rand) \ | |
744 | (const void *k, size_t ksz, const void *n) \ | |
745 | { \ | |
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); \ | |
750 | return (&g->r.r); \ | |
751 | } | |
752 | SALSA20_VARS(DEFXGRAND) | |
753 | ||
754 | /*----- Test rig ----------------------------------------------------------*/ | |
755 | ||
756 | #ifdef TEST_RIG | |
757 | ||
758 | #include <stdio.h> | |
759 | #include <string.h> | |
760 | ||
761 | #include <mLib/quis.h> | |
762 | #include <mLib/testrig.h> | |
763 | ||
a4c2e267 MW |
764 | static const int perm[] = { |
765 | 0, 13, 10, 7, | |
766 | 4, 1, 14, 11, | |
767 | 8, 5, 2, 15, | |
768 | 12, 9, 6, 3 | |
769 | }; | |
770 | ||
194e93f2 MW |
771 | #define DEFVCORE(r) \ |
772 | static int v_core_##r(dstr *v) \ | |
773 | { \ | |
774 | salsa20_matrix a, b; \ | |
775 | dstr d = DSTR_INIT; \ | |
a4c2e267 | 776 | int i, j, n; \ |
194e93f2 MW |
777 | int ok = 1; \ |
778 | \ | |
779 | DENSURE(&d, SALSA20_OUTSZ); d.len = SALSA20_OUTSZ; \ | |
780 | n = *(int *)v[0].buf; \ | |
781 | for (i = 0; i < SALSA20_OUTSZ/4; i++) \ | |
a4c2e267 | 782 | b[i] = LOAD32_L(v[1].buf + 4*i); \ |
194e93f2 | 783 | for (i = 0; i < n; i++) { \ |
a4c2e267 | 784 | for (j = 0; j < 16; j++) a[perm[j]] = b[j]; \ |
194e93f2 MW |
785 | core(r, a, b); \ |
786 | memcpy(a, b, sizeof(a)); \ | |
787 | } \ | |
a4c2e267 | 788 | for (i = 0; i < SALSA20_OUTSZ/4; i++) STORE32_L(d.buf + 4*i, b[i]); \ |
194e93f2 MW |
789 | \ |
790 | if (d.len != v[2].len || memcmp(d.buf, v[2].buf, v[2].len) != 0) { \ | |
791 | ok = 0; \ | |
792 | printf("\nfail core:" \ | |
793 | "\n\titerations = %d" \ | |
794 | "\n\tin = ", n); \ | |
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); \ | |
800 | putchar('\n'); \ | |
801 | } \ | |
802 | \ | |
803 | dstr_destroy(&d); \ | |
804 | return (ok); \ | |
805 | } | |
806 | SALSA20_VARS(DEFVCORE) | |
807 | ||
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) | |
811 | ||
812 | #define DEFxVENC(base, BASE, r) \ | |
813 | static int v_encrypt_##base##_##r(dstr *v) \ | |
814 | { \ | |
815 | BASE##_CTX(r) ctx; \ | |
816 | dstr d = DSTR_INIT; \ | |
817 | kludge64 pos; \ | |
818 | const octet *p, *p0; \ | |
819 | octet *q; \ | |
820 | size_t sz, sz0, step; \ | |
821 | unsigned long skip; \ | |
822 | int ok = 1; \ | |
823 | \ | |
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; \ | |
828 | \ | |
829 | step = 0; \ | |
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); \ | |
834 | if (v[2].len) { \ | |
835 | LOAD64_(pos, v[2].buf); \ | |
836 | BASE##_SEEKU64(r, &ctx, pos); \ | |
837 | } \ | |
838 | \ | |
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; \ | |
843 | sz >= step; \ | |
844 | sz -= step, q += step) { \ | |
845 | BASE##_ENCRYPT(r, &ctx, p, q, step); \ | |
846 | if (p) p += step; \ | |
847 | } \ | |
848 | if (sz) BASE##_ENCRYPT(r, &ctx, p, q, sz); \ | |
849 | \ | |
850 | if (d.len != v[5].len || memcmp(d.buf, v[5].buf, v[5].len) != 0) { \ | |
851 | ok = 0; \ | |
852 | printf("\nfail encrypt:" \ | |
853 | "\n\tstep = %lu" \ | |
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); \ | |
867 | putchar('\n'); \ | |
868 | } \ | |
869 | } \ | |
870 | \ | |
871 | dstr_destroy(&d); \ | |
872 | return (ok); \ | |
873 | } | |
874 | #define DEFVENC(r) DEFxVENC(salsa20, SALSA20, r) | |
875 | #define DEFXVENC(r) DEFxVENC(xsalsa20, XSALSA20, r) | |
876 | SALSA20_VARS(DEFVENC) | |
877 | SALSA20_VARS(DEFXVENC) | |
878 | ||
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 } }, | |
884 | #define DEFTAB(r) \ | |
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) | |
889 | SALSA20_VARS(DEFTAB) | |
890 | SALSA20_VARS(DEFXTAB) | |
891 | { 0, 0, { 0 } } | |
892 | }; | |
893 | ||
894 | int main(int argc, char *argv[]) | |
895 | { | |
896 | test_run(argc, argv, defs, SRCDIR"/t/salsa20"); | |
897 | return (0); | |
898 | } | |
899 | ||
900 | #endif | |
901 | ||
902 | /*----- That's all, folks -------------------------------------------------*/ |