Commit | Line | Data |
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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 | ||
8a1aa284 MW |
45 | CPU_DISPATCH(static, (void), void, core, |
46 | (unsigned r, const salsa20_matrix src, salsa20_matrix dest), | |
47 | (r, src, dest), pick_core, simple_core); | |
e10e6494 MW |
48 | |
49 | static void simple_core(unsigned r, const salsa20_matrix src, | |
50 | salsa20_matrix dest) | |
194e93f2 MW |
51 | { SALSA20_nR(dest, src, r); SALSA20_FFWD(dest, src); } |
52 | ||
0f23f75f MW |
53 | #if CPUFAM_X86 || CPUFAM_AMD64 |
54 | extern core__functype salsa20_core_x86ish_sse2; | |
e10e6494 MW |
55 | #endif |
56 | ||
704d59c8 MW |
57 | #if CPUFAM_ARMEL |
58 | extern core__functype salsa20_core_arm_neon; | |
59 | #endif | |
60 | ||
e10e6494 MW |
61 | static core__functype *pick_core(void) |
62 | { | |
0f23f75f MW |
63 | #if CPUFAM_X86 || CPUFAM_AMD64 |
64 | DISPATCH_PICK_COND(salsa20_core, salsa20_core_x86ish_sse2, | |
fac645f7 | 65 | cpu_feature_p(CPUFEAT_X86_SSE2)); |
704d59c8 MW |
66 | #endif |
67 | #if CPUFAM_ARMEL | |
68 | DISPATCH_PICK_COND(salsa20_core, salsa20_core_arm_neon, | |
69 | cpu_feature_p(CPUFEAT_ARM_NEON)); | |
e10e6494 | 70 | #endif |
fac645f7 | 71 | DISPATCH_PICK_FALLBACK(salsa20_core, simple_core); |
e10e6494 MW |
72 | } |
73 | ||
194e93f2 MW |
74 | /* --- @populate@ --- * |
75 | * | |
76 | * Arguments: @salsa20_matrix a@ = a matrix to fill in | |
77 | * @const void *key@ = pointer to key material | |
78 | * @size_t ksz@ = size of key | |
79 | * | |
80 | * Returns: --- | |
81 | * | |
82 | * Use: Fills in a Salsa20 matrix from the key, setting the | |
83 | * appropriate constants according to the key length. The nonce | |
84 | * and position words are left uninitialized. | |
85 | */ | |
86 | ||
87 | static void populate(salsa20_matrix a, const void *key, size_t ksz) | |
88 | { | |
89 | const octet *k = key; | |
90 | ||
91 | KSZ_ASSERT(salsa20, ksz); | |
92 | ||
a4c2e267 MW |
93 | /* Here's the pattern of key, constant, nonce, and counter pieces in the |
94 | * matrix, before and after our permutation. | |
95 | * | |
96 | * [ C0 K0 K1 K2 ] [ C0 C1 C2 C3 ] | |
97 | * [ K3 C1 N0 N1 ] --> [ K3 T1 K7 K2 ] | |
98 | * [ T0 T1 C2 K4 ] [ T0 K6 K1 N1 ] | |
99 | * [ K5 K6 K7 C3 ] [ K5 K0 N0 K4 ] | |
100 | */ | |
101 | ||
102 | a[13] = LOAD32_L(k + 0); | |
103 | a[10] = LOAD32_L(k + 4); | |
194e93f2 | 104 | if (ksz == 10) { |
a4c2e267 | 105 | a[ 7] = LOAD16_L(k + 8); |
194e93f2 MW |
106 | a[ 4] = 0; |
107 | } else { | |
a4c2e267 | 108 | a[ 7] = LOAD32_L(k + 8); |
194e93f2 MW |
109 | a[ 4] = LOAD32_L(k + 12); |
110 | } | |
111 | if (ksz <= 16) { | |
a4c2e267 MW |
112 | a[15] = a[13]; |
113 | a[12] = a[10]; | |
114 | a[ 9] = a[ 7]; | |
115 | a[ 6] = a[ 4]; | |
194e93f2 | 116 | a[ 0] = SALSA20_A128; |
a4c2e267 MW |
117 | a[ 1] = SALSA20_B128; |
118 | a[ 2] = ksz == 10 ? SALSA20_C80 : SALSA20_C128; | |
119 | a[ 3] = SALSA20_D128; | |
194e93f2 | 120 | } else { |
a4c2e267 | 121 | a[15] = LOAD32_L(k + 16); |
194e93f2 | 122 | a[12] = LOAD32_L(k + 20); |
a4c2e267 MW |
123 | a[ 9] = LOAD32_L(k + 24); |
124 | a[ 6] = LOAD32_L(k + 28); | |
194e93f2 | 125 | a[ 0] = SALSA20_A256; |
a4c2e267 MW |
126 | a[ 1] = SALSA20_B256; |
127 | a[ 2] = SALSA20_C256; | |
128 | a[ 3] = SALSA20_D256; | |
194e93f2 MW |
129 | } |
130 | } | |
131 | ||
132 | /*----- Salsa20 implementation --------------------------------------------*/ | |
133 | ||
134 | /* --- @salsa20_init@ --- * | |
135 | * | |
136 | * Arguments: @salsa20_ctx *ctx@ = context to fill in | |
137 | * @const void *key@ = pointer to key material | |
138 | * @size_t ksz@ = size of key (either 32 or 16) | |
139 | * @const void *nonce@ = initial nonce, or null | |
140 | * | |
141 | * Returns: --- | |
142 | * | |
143 | * Use: Initializes a Salsa20 context ready for use. | |
144 | */ | |
145 | ||
146 | void salsa20_init(salsa20_ctx *ctx, const void *key, size_t ksz, | |
147 | const void *nonce) | |
148 | { | |
149 | static const octet zerononce[SALSA20_NONCESZ]; | |
150 | ||
151 | populate(ctx->a, key, ksz); | |
152 | salsa20_setnonce(ctx, nonce ? nonce : zerononce); | |
153 | } | |
154 | ||
155 | /* --- @salsa20_setnonce@ --- * | |
156 | * | |
157 | * Arguments: @salsa20_ctx *ctx@ = pointer to context | |
158 | * @const void *nonce@ = the nonce (@SALSA20_NONCESZ@ bytes) | |
159 | * | |
160 | * Returns: --- | |
161 | * | |
162 | * Use: Set a new nonce in the context @ctx@, e.g., for processing a | |
163 | * different message. The stream position is reset to zero (see | |
164 | * @salsa20_seek@ etc.). | |
165 | */ | |
166 | ||
167 | void salsa20_setnonce(salsa20_ctx *ctx, const void *nonce) | |
168 | { | |
169 | const octet *n = nonce; | |
170 | ||
a4c2e267 MW |
171 | ctx->a[14] = LOAD32_L(n + 0); |
172 | ctx->a[11] = LOAD32_L(n + 4); | |
194e93f2 MW |
173 | salsa20_seek(ctx, 0); |
174 | } | |
175 | ||
176 | /* --- @salsa20_seek@, @salsa20_seeku64@ --- * | |
177 | * | |
178 | * Arguments: @salsa20_ctx *ctx@ = pointer to context | |
179 | * @unsigned long i@, @kludge64 i@ = new position to set | |
180 | * | |
181 | * Returns: --- | |
182 | * | |
183 | * Use: Sets a new stream position, in units of Salsa20 output | |
184 | * blocks, which are @SALSA20_OUTSZ@ bytes each. Byte | |
185 | * granularity can be achieved by calling @salsa20R_encrypt@ | |
186 | * appropriately. | |
187 | */ | |
188 | ||
189 | void salsa20_seek(salsa20_ctx *ctx, unsigned long i) | |
190 | { kludge64 ii; ASSIGN64(ii, i); salsa20_seeku64(ctx, ii); } | |
191 | ||
192 | void salsa20_seeku64(salsa20_ctx *ctx, kludge64 i) | |
193 | { | |
a4c2e267 | 194 | ctx->a[8] = LO64(i); ctx->a[5] = HI64(i); |
194e93f2 MW |
195 | ctx->bufi = SALSA20_OUTSZ; |
196 | } | |
197 | ||
198 | /* --- @salsa20_tell@, @salsa20_tellu64@ --- * | |
199 | * | |
200 | * Arguments: @salsa20_ctx *ctx@ = pointer to context | |
201 | * | |
202 | * Returns: The current position in the output stream, in blocks, | |
203 | * rounding upwards. | |
204 | */ | |
205 | ||
206 | unsigned long salsa20_tell(salsa20_ctx *ctx) | |
207 | { kludge64 i = salsa20_tellu64(ctx); return (GET64(unsigned long, i)); } | |
208 | ||
209 | kludge64 salsa20_tellu64(salsa20_ctx *ctx) | |
a4c2e267 | 210 | { kludge64 i; SET64(i, ctx->a[5], ctx->a[8]); return (i); } |
194e93f2 MW |
211 | |
212 | /* --- @salsa20{,12,8}_encrypt@ --- * | |
213 | * | |
214 | * Arguments: @salsa20_ctx *ctx@ = pointer to context | |
215 | * @const void *src@ = source buffer (or null) | |
216 | * @void *dest@ = destination buffer (or null) | |
217 | * @size_t sz@ = size of the buffers | |
218 | * | |
219 | * Returns: --- | |
220 | * | |
221 | * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@. | |
222 | * Salsa20 works by XORing plaintext with a keystream, so | |
223 | * encryption and decryption are the same operation. If @dest@ | |
224 | * is null then ignore @src@ and skip @sz@ bytes of the | |
225 | * keystream. If @src@ is null, then just write the keystream | |
226 | * to @dest@. | |
227 | */ | |
228 | ||
229 | #define SALSA20_ENCRYPT(r, ctx, src, dest, sz) \ | |
230 | SALSA20_DECOR(salsa20, r, _encrypt)(ctx, src, dest, sz) | |
231 | #define DEFENCRYPT(r) \ | |
232 | void SALSA20_ENCRYPT(r, salsa20_ctx *ctx, const void *src, \ | |
233 | void *dest, size_t sz) \ | |
234 | { \ | |
235 | salsa20_matrix b; \ | |
236 | const octet *s = src; \ | |
237 | octet *d = dest; \ | |
238 | size_t n; \ | |
239 | kludge64 pos, delta; \ | |
240 | \ | |
241 | SALSA20_OUTBUF(ctx, d, s, sz); \ | |
242 | if (!sz) return; \ | |
243 | \ | |
244 | if (!dest) { \ | |
245 | n = sz/SALSA20_OUTSZ; \ | |
246 | pos = salsa20_tellu64(ctx); \ | |
247 | ASSIGN64(delta, n); \ | |
248 | ADD64(pos, pos, delta); \ | |
249 | salsa20_seeku64(ctx, pos); \ | |
250 | sz = sz%SALSA20_OUTSZ; \ | |
251 | } else if (!src) { \ | |
252 | while (sz >= SALSA20_OUTSZ) { \ | |
253 | core(r, ctx->a, b); \ | |
254 | SALSA20_STEP(ctx->a); \ | |
255 | SALSA20_GENFULL(b, d); \ | |
256 | sz -= SALSA20_OUTSZ; \ | |
257 | } \ | |
258 | } else { \ | |
259 | while (sz >= SALSA20_OUTSZ) { \ | |
260 | core(r, ctx->a, b); \ | |
261 | SALSA20_STEP(ctx->a); \ | |
262 | SALSA20_MIXFULL(b, d, s); \ | |
263 | sz -= SALSA20_OUTSZ; \ | |
264 | } \ | |
265 | } \ | |
266 | \ | |
267 | if (sz) { \ | |
268 | core(r, ctx->a, b); \ | |
269 | SALSA20_STEP(ctx->a); \ | |
270 | SALSA20_PREPBUF(ctx, b); \ | |
271 | SALSA20_OUTBUF(ctx, d, s, sz); \ | |
272 | assert(!sz); \ | |
273 | } \ | |
274 | } | |
275 | SALSA20_VARS(DEFENCRYPT) | |
276 | ||
277 | /*----- HSalsa20 implementation -------------------------------------------*/ | |
278 | ||
279 | #define HSALSA20_RAW(r, ctx, src, dest) \ | |
280 | SALSA20_DECOR(hsalsa20, r, _raw)(ctx, src, dest) | |
281 | #define HSALSA20_PRF(r, ctx, src, dest) \ | |
282 | SALSA20_DECOR(hsalsa20, r, _prf)(ctx, src, dest) | |
283 | ||
284 | /* --- @hsalsa20{,12,8}_prf@ --- * | |
285 | * | |
286 | * Arguments: @salsa20_ctx *ctx@ = pointer to context | |
287 | * @const void *src@ = the input (@HSALSA20_INSZ@ bytes) | |
288 | * @void *dest@ = the output (@HSALSA20_OUTSZ@ bytes) | |
289 | * | |
290 | * Returns: --- | |
291 | * | |
292 | * Use: Apply the HSalsa20/r pseudorandom function to @src@, writing | |
293 | * the result to @out@. | |
294 | */ | |
295 | ||
296 | #define DEFHSALSA20(r) \ | |
297 | static void HSALSA20_RAW(r, salsa20_matrix k, \ | |
298 | const uint32 *src, uint32 *dest) \ | |
299 | { \ | |
300 | salsa20_matrix a; \ | |
301 | int i; \ | |
302 | \ | |
303 | /* --- HSalsa20, computed from full Salsa20 --- * \ | |
304 | * \ | |
305 | * The security proof makes use of the fact that HSalsa20 (i.e., \ | |
306 | * without the final feedforward step) can be computed from full \ | |
307 | * Salsa20 using only knowledge of the non-secret input. I don't \ | |
308 | * want to compromise the performance of the main function by \ | |
309 | * making the feedforward step separate, but this operation is less \ | |
310 | * speed critical, so we do it the harder way. \ | |
311 | */ \ | |
312 | \ | |
a4c2e267 | 313 | for (i = 0; i < 4; i++) k[14 - 3*i] = src[i]; \ |
194e93f2 | 314 | core(r, k, a); \ |
a4c2e267 MW |
315 | for (i = 0; i < 4; i++) dest[i] = a[5*i] - k[i]; \ |
316 | for (i = 4; i < 8; i++) dest[i] = a[i + 2] - k[26 - 3*i]; \ | |
194e93f2 MW |
317 | } \ |
318 | \ | |
319 | void HSALSA20_PRF(r, salsa20_ctx *ctx, const void *src, void *dest) \ | |
320 | { \ | |
321 | const octet *s = src; \ | |
322 | octet *d = dest; \ | |
323 | uint32 in[4], out[8]; \ | |
324 | int i; \ | |
325 | \ | |
326 | for (i = 0; i < 4; i++) in[i] = LOAD32_L(s + 4*i); \ | |
327 | HSALSA20_RAW(r, ctx->a, in, out); \ | |
328 | for (i = 0; i < 8; i++) STORE32_L(d + 4*i, out[i]); \ | |
329 | } | |
330 | SALSA20_VARS(DEFHSALSA20) | |
331 | ||
332 | /*----- XSalsa20 implementation -------------------------------------------*/ | |
333 | ||
334 | /* --- Some convenient macros for naming functions --- * | |
335 | * | |
336 | * Because the crypto core is involved in XSalsa20/r's per-nonce setup, we | |
337 | * need to take an interest in the number of rounds in most of the various | |
338 | * functions, and it will probably help if we distinguish the context | |
339 | * structures for the various versions. | |
340 | */ | |
341 | ||
342 | #define XSALSA20_CTX(r) SALSA20_DECOR(xsalsa20, r, _ctx) | |
343 | #define XSALSA20_INIT(r, ctx, k, ksz, n) \ | |
344 | SALSA20_DECOR(xsalsa20, r, _init)(ctx, k, ksz, n) | |
345 | #define XSALSA20_SETNONCE(r, ctx, n) \ | |
346 | SALSA20_DECOR(xsalsa20, r, _setnonce)(ctx, n) | |
347 | #define XSALSA20_SEEK(r, ctx, i) \ | |
348 | SALSA20_DECOR(xsalsa20, r, _seek)(ctx, i) | |
349 | #define XSALSA20_SEEKU64(r, ctx, i) \ | |
350 | SALSA20_DECOR(xsalsa20, r, _seeku64)(ctx, i) | |
351 | #define XSALSA20_TELL(r, ctx) \ | |
352 | SALSA20_DECOR(xsalsa20, r, _tell)(ctx) | |
353 | #define XSALSA20_TELLU64(r, ctx) \ | |
354 | SALSA20_DECOR(xsalsa20, r, _tellu64)(ctx) | |
355 | #define XSALSA20_ENCRYPT(r, ctx, src, dest, sz) \ | |
356 | SALSA20_DECOR(xsalsa20, r, _encrypt)(ctx, src, dest, sz) | |
357 | ||
358 | /* --- @xsalsa20{,12,8}_init@ --- * | |
359 | * | |
360 | * Arguments: @xsalsa20R_ctx *ctx@ = the context to fill in | |
361 | * @const void *key@ = pointer to key material | |
362 | * @size_t ksz@ = size of key (either 32 or 16) | |
363 | * @const void *nonce@ = initial nonce, or null | |
364 | * | |
365 | * Returns: --- | |
366 | * | |
367 | * Use: Initializes an XSalsa20/r context ready for use. | |
368 | * | |
369 | * There is a different function for each number of rounds, | |
370 | * unlike for plain Salsa20. | |
371 | */ | |
372 | ||
373 | #define DEFXINIT(r) \ | |
374 | void XSALSA20_INIT(r, XSALSA20_CTX(r) *ctx, \ | |
375 | const void *key, size_t ksz, const void *nonce) \ | |
376 | { \ | |
377 | static const octet zerononce[XSALSA20_NONCESZ]; \ | |
378 | \ | |
379 | populate(ctx->k, key, ksz); \ | |
380 | ctx->s.a[ 0] = SALSA20_A256; \ | |
a4c2e267 MW |
381 | ctx->s.a[ 1] = SALSA20_B256; \ |
382 | ctx->s.a[ 2] = SALSA20_C256; \ | |
383 | ctx->s.a[ 3] = SALSA20_D256; \ | |
194e93f2 MW |
384 | XSALSA20_SETNONCE(r, ctx, nonce ? nonce : zerononce); \ |
385 | } | |
386 | SALSA20_VARS(DEFXINIT) | |
387 | ||
388 | /* --- @xsalsa20{,12,8}_setnonce@ --- * | |
389 | * | |
390 | * Arguments: @xsalsa20R_ctx *ctx@ = pointer to context | |
391 | * @const void *nonce@ = the nonce (@XSALSA20_NONCESZ@ bytes) | |
392 | * | |
393 | * Returns: --- | |
394 | * | |
395 | * Use: Set a new nonce in the context @ctx@, e.g., for processing a | |
396 | * different message. The stream position is reset to zero (see | |
397 | * @salsa20_seek@ etc.). | |
398 | * | |
399 | * There is a different function for each number of rounds, | |
400 | * unlike for plain Salsa20. | |
401 | */ | |
402 | ||
403 | #define DEFXNONCE(r) \ | |
404 | void XSALSA20_SETNONCE(r, XSALSA20_CTX(r) *ctx, const void *nonce) \ | |
405 | { \ | |
406 | const octet *n = nonce; \ | |
407 | uint32 in[4], out[8]; \ | |
408 | int i; \ | |
409 | \ | |
410 | for (i = 0; i < 4; i++) in[i] = LOAD32_L(n + 4*i); \ | |
411 | HSALSA20_RAW(r, ctx->k, in, out); \ | |
a4c2e267 MW |
412 | for (i = 0; i < 4; i++) ctx->s.a[13 - 3*i] = out[i]; \ |
413 | for (i = 4; i < 8; i++) ctx->s.a[27 - 3*i] = out[i]; \ | |
194e93f2 MW |
414 | salsa20_setnonce(&ctx->s, n + 16); \ |
415 | } | |
416 | SALSA20_VARS(DEFXNONCE) | |
417 | ||
418 | /* --- @xsalsa20{,12,8}_seek@, @xsalsa20{,12,8}_seeku64@ --- * | |
419 | * | |
420 | * Arguments: @xsalsa20R_ctx *ctx@ = pointer to context | |
421 | * @unsigned long i@, @kludge64 i@ = new position to set | |
422 | * | |
423 | * Returns: --- | |
424 | * | |
425 | * Use: Sets a new stream position, in units of Salsa20 output | |
426 | * blocks, which are @XSALSA20_OUTSZ@ bytes each. Byte | |
427 | * granularity can be achieved by calling @xsalsa20R_encrypt@ | |
428 | * appropriately. | |
429 | * | |
430 | * There is a different function for each number of rounds, | |
431 | * unlike for plain Salsa20, because the context structures are | |
432 | * different. | |
433 | */ | |
434 | ||
435 | /* --- @xsalsa20{,12,8}_tell@, @xsalsa20{,12,8}_tellu64@ --- * | |
436 | * | |
437 | * Arguments: @salsa20_ctx *ctx@ = pointer to context | |
438 | * | |
439 | * Returns: The current position in the output stream, in blocks, | |
440 | * rounding upwards. | |
441 | * | |
442 | * There is a different function for each number of rounds, | |
443 | * unlike for plain Salsa20, because the context structures are | |
444 | * different. | |
445 | */ | |
446 | ||
447 | /* --- @xsalsa20{,12,8}_encrypt@ --- * | |
448 | * | |
449 | * Arguments: @xsalsa20R_ctx *ctx@ = pointer to context | |
450 | * @const void *src@ = source buffer (or null) | |
451 | * @void *dest@ = destination buffer (or null) | |
452 | * @size_t sz@ = size of the buffers | |
453 | * | |
454 | * Returns: --- | |
455 | * | |
456 | * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@. | |
457 | * XSalsa20 works by XORing plaintext with a keystream, so | |
458 | * encryption and decryption are the same operation. If @dest@ | |
459 | * is null then ignore @src@ and skip @sz@ bytes of the | |
460 | * keystream. If @src@ is null, then just write the keystream | |
461 | * to @dest@. | |
462 | */ | |
463 | ||
464 | #define DEFXPASSTHRU(r) \ | |
465 | void XSALSA20_SEEK(r, XSALSA20_CTX(r) *ctx, unsigned long i) \ | |
466 | { salsa20_seek(&ctx->s, i); } \ | |
467 | void XSALSA20_SEEKU64(r, XSALSA20_CTX(r) *ctx, kludge64 i) \ | |
468 | { salsa20_seeku64(&ctx->s, i); } \ | |
469 | unsigned long XSALSA20_TELL(r, XSALSA20_CTX(r) *ctx) \ | |
470 | { return salsa20_tell(&ctx->s); } \ | |
471 | kludge64 XSALSA20_TELLU64(r, XSALSA20_CTX(r) *ctx) \ | |
472 | { return salsa20_tellu64(&ctx->s); } \ | |
473 | void XSALSA20_ENCRYPT(r, XSALSA20_CTX(r) *ctx, \ | |
474 | const void *src, void *dest, size_t sz) \ | |
475 | { SALSA20_ENCRYPT(r, &ctx->s, src, dest, sz); } | |
476 | SALSA20_VARS(DEFXPASSTHRU) | |
477 | ||
478 | /*----- Generic cipher interface ------------------------------------------*/ | |
479 | ||
480 | typedef struct gctx { gcipher c; salsa20_ctx ctx; } gctx; | |
481 | ||
482 | static void gsetiv(gcipher *c, const void *iv) | |
483 | { gctx *g = (gctx *)c; salsa20_setnonce(&g->ctx, iv); } | |
484 | ||
485 | static void gdestroy(gcipher *c) | |
486 | { gctx *g = (gctx *)c; BURN(*g); S_DESTROY(g); } | |
487 | ||
488 | #define DEFGCIPHER(r) \ | |
489 | \ | |
490 | static const gcipher_ops gops_##r; \ | |
491 | \ | |
492 | static gcipher *ginit_##r(const void *k, size_t sz) \ | |
493 | { \ | |
494 | gctx *g = S_CREATE(gctx); \ | |
495 | g->c.ops = &gops_##r; \ | |
496 | salsa20_init(&g->ctx, k, sz, 0); \ | |
497 | return (&g->c); \ | |
498 | } \ | |
499 | \ | |
500 | static void gencrypt_##r(gcipher *c, const void *s, \ | |
501 | void *t, size_t sz) \ | |
502 | { gctx *g = (gctx *)c; SALSA20_ENCRYPT(r, &g->ctx, s, t, sz); } \ | |
503 | \ | |
504 | static const gcipher_ops gops_##r = { \ | |
505 | &SALSA20_DECOR(salsa20, r, ), \ | |
506 | gencrypt_##r, gencrypt_##r, gdestroy, gsetiv, 0 \ | |
507 | }; \ | |
508 | \ | |
509 | const gccipher SALSA20_DECOR(salsa20, r, ) = { \ | |
510 | SALSA20_NAME_##r, salsa20_keysz, \ | |
511 | SALSA20_NONCESZ, ginit_##r \ | |
512 | }; | |
513 | ||
514 | SALSA20_VARS(DEFGCIPHER) | |
515 | ||
516 | #define DEFGXCIPHER(r) \ | |
517 | \ | |
518 | typedef struct { gcipher c; XSALSA20_CTX(r) ctx; } gxctx_##r; \ | |
519 | \ | |
520 | static void gxsetiv_##r(gcipher *c, const void *iv) \ | |
521 | { gxctx_##r *g = (gxctx_##r *)c; XSALSA20_SETNONCE(r, &g->ctx, iv); } \ | |
522 | \ | |
523 | static void gxdestroy_##r(gcipher *c) \ | |
524 | { gxctx_##r *g = (gxctx_##r *)c; BURN(*g); S_DESTROY(g); } \ | |
525 | \ | |
526 | static const gcipher_ops gxops_##r; \ | |
527 | \ | |
528 | static gcipher *gxinit_##r(const void *k, size_t sz) \ | |
529 | { \ | |
530 | gxctx_##r *g = S_CREATE(gxctx_##r); \ | |
531 | g->c.ops = &gxops_##r; \ | |
532 | XSALSA20_INIT(r, &g->ctx, k, sz, 0); \ | |
533 | return (&g->c); \ | |
534 | } \ | |
535 | \ | |
536 | static void gxencrypt_##r(gcipher *c, const void *s, \ | |
537 | void *t, size_t sz) \ | |
538 | { \ | |
539 | gxctx_##r *g = (gxctx_##r *)c; \ | |
540 | XSALSA20_ENCRYPT(r, &g->ctx, s, t, sz); \ | |
541 | } \ | |
542 | \ | |
543 | static const gcipher_ops gxops_##r = { \ | |
544 | &SALSA20_DECOR(xsalsa20, r, ), \ | |
545 | gxencrypt_##r, gxencrypt_##r, gxdestroy_##r, gxsetiv_##r, 0 \ | |
546 | }; \ | |
547 | \ | |
548 | const gccipher SALSA20_DECOR(xsalsa20, r, ) = { \ | |
549 | "x" SALSA20_NAME_##r, salsa20_keysz, \ | |
550 | XSALSA20_NONCESZ, gxinit_##r \ | |
551 | }; | |
552 | ||
553 | SALSA20_VARS(DEFGXCIPHER) | |
554 | ||
555 | /*----- Generic random number generator interface -------------------------*/ | |
556 | ||
557 | typedef struct grops { | |
558 | size_t noncesz; | |
559 | void (*seek)(void *, kludge64); | |
560 | kludge64 (*tell)(void *); | |
561 | void (*setnonce)(void *, const void *); | |
562 | void (*generate)(void *, void *, size_t); | |
563 | } grops; | |
564 | ||
565 | typedef struct grbasectx { | |
566 | grand r; | |
567 | const grops *ops; | |
568 | } grbasectx; | |
569 | ||
570 | static int grmisc(grand *r, unsigned op, ...) | |
571 | { | |
572 | octet buf[XSALSA20_NONCESZ]; | |
573 | grbasectx *g = (grbasectx *)r; | |
574 | grand *rr; | |
575 | const octet *p; | |
576 | size_t sz; | |
577 | uint32 i; | |
578 | unsigned long ul; | |
579 | kludge64 pos; | |
580 | va_list ap; | |
581 | int rc = 0; | |
582 | ||
583 | va_start(ap, op); | |
584 | ||
585 | switch (op) { | |
586 | case GRAND_CHECK: | |
587 | switch (va_arg(ap, unsigned)) { | |
588 | case GRAND_CHECK: | |
589 | case GRAND_SEEDINT: | |
590 | case GRAND_SEEDUINT32: | |
591 | case GRAND_SEEDBLOCK: | |
592 | case GRAND_SEEDRAND: | |
593 | case SALSA20_SEEK: | |
594 | case SALSA20_SEEKU64: | |
595 | case SALSA20_TELL: | |
596 | case SALSA20_TELLU64: | |
597 | rc = 1; | |
598 | break; | |
599 | default: | |
600 | rc = 0; | |
601 | break; | |
602 | } | |
603 | break; | |
604 | ||
605 | case GRAND_SEEDINT: | |
606 | i = va_arg(ap, unsigned); STORE32_L(buf, i); | |
607 | memset(buf + 4, 0, g->ops->noncesz - 4); | |
608 | g->ops->setnonce(g, buf); | |
609 | break; | |
610 | case GRAND_SEEDUINT32: | |
611 | i = va_arg(ap, uint32); STORE32_L(buf, i); | |
612 | memset(buf + 4, 0, g->ops->noncesz - 4); | |
613 | g->ops->setnonce(g, buf); | |
614 | break; | |
615 | case GRAND_SEEDBLOCK: | |
616 | p = va_arg(ap, const void *); | |
617 | sz = va_arg(ap, size_t); | |
618 | if (sz < g->ops->noncesz) { | |
619 | memcpy(buf, p, sz); | |
620 | memset(buf + sz, 0, g->ops->noncesz - sz); | |
621 | p = buf; | |
622 | } | |
623 | g->ops->setnonce(g, p); | |
624 | break; | |
625 | case GRAND_SEEDRAND: | |
626 | rr = va_arg(ap, grand *); | |
627 | rr->ops->fill(rr, buf, g->ops->noncesz); | |
628 | g->ops->setnonce(g, buf); | |
629 | break; | |
630 | case SALSA20_SEEK: | |
631 | ul = va_arg(ap, unsigned long); ASSIGN64(pos, ul); | |
632 | g->ops->seek(g, pos); | |
633 | break; | |
634 | case SALSA20_SEEKU64: | |
635 | pos = va_arg(ap, kludge64); | |
636 | g->ops->seek(g, pos); | |
637 | break; | |
638 | case SALSA20_TELL: | |
639 | pos = g->ops->tell(g); | |
640 | *va_arg(ap, unsigned long *) = GET64(unsigned long, pos); | |
641 | break; | |
642 | case SALSA20_TELLU64: | |
643 | *va_arg(ap, kludge64 *) = g->ops->tell(g); | |
644 | break; | |
645 | default: | |
646 | GRAND_BADOP; | |
647 | break; | |
648 | } | |
649 | ||
650 | return (rc); | |
651 | } | |
652 | ||
653 | static octet grbyte(grand *r) | |
654 | { | |
655 | grbasectx *g = (grbasectx *)r; | |
656 | octet o; | |
657 | g->ops->generate(g, &o, 1); | |
658 | return (o); | |
659 | } | |
660 | ||
661 | static uint32 grword(grand *r) | |
662 | { | |
663 | grbasectx *g = (grbasectx *)r; | |
664 | octet b[4]; | |
665 | g->ops->generate(g, b, sizeof(b)); | |
666 | return (LOAD32_L(b)); | |
667 | } | |
668 | ||
669 | static void grfill(grand *r, void *p, size_t sz) | |
670 | { | |
671 | grbasectx *g = (grbasectx *)r; | |
672 | g->ops->generate(r, p, sz); | |
673 | } | |
674 | ||
675 | typedef struct grctx { | |
676 | grbasectx r; | |
677 | salsa20_ctx ctx; | |
678 | } grctx; | |
679 | ||
680 | static void gr_seek(void *r, kludge64 pos) | |
681 | { grctx *g = r; salsa20_seeku64(&g->ctx, pos); } | |
682 | ||
683 | static kludge64 gr_tell(void *r) | |
684 | { grctx *g = r; return (salsa20_tellu64(&g->ctx)); } | |
685 | ||
686 | static void gr_setnonce(void *r, const void *n) | |
687 | { grctx *g = r; salsa20_setnonce(&g->ctx, n); } | |
688 | ||
689 | static void grdestroy(grand *r) | |
690 | { grctx *g = (grctx *)r; BURN(*g); S_DESTROY(g); } | |
691 | ||
692 | #define DEFGRAND(rr) \ | |
693 | \ | |
694 | static void gr_generate_##rr(void *r, void *b, size_t sz) \ | |
695 | { grctx *g = r; SALSA20_ENCRYPT(rr, &g->ctx, 0, b, sz); } \ | |
696 | \ | |
697 | static const grops grops_##rr = \ | |
698 | { SALSA20_NONCESZ, gr_seek, gr_tell, \ | |
699 | gr_setnonce, gr_generate_##rr }; \ | |
700 | \ | |
701 | static const grand_ops grops_rand_##rr = { \ | |
702 | SALSA20_NAME_##rr, GRAND_CRYPTO, 0, \ | |
703 | grmisc, grdestroy, grword, \ | |
44ff6c11 | 704 | grbyte, grword, grand_defaultrange, grfill \ |
194e93f2 MW |
705 | }; \ |
706 | \ | |
707 | grand *SALSA20_DECOR(salsa20, rr, _rand) \ | |
708 | (const void *k, size_t ksz, const void *n) \ | |
709 | { \ | |
710 | grctx *g = S_CREATE(g); \ | |
711 | g->r.r.ops = &grops_rand_##rr; \ | |
712 | g->r.ops = &grops_##rr; \ | |
713 | salsa20_init(&g->ctx, k, ksz, n); \ | |
714 | return (&g->r.r); \ | |
715 | } | |
716 | SALSA20_VARS(DEFGRAND) | |
717 | ||
718 | #define DEFXGRAND(rr) \ | |
719 | \ | |
720 | typedef struct grxctx_##rr { \ | |
721 | grbasectx r; \ | |
722 | XSALSA20_CTX(rr) ctx; \ | |
723 | } grxctx_##rr; \ | |
724 | \ | |
725 | static void grx_seek_##rr(void *r, kludge64 pos) \ | |
726 | { grxctx_##rr *g = r; XSALSA20_SEEKU64(rr, &g->ctx, pos); } \ | |
727 | \ | |
728 | static kludge64 grx_tell_##rr(void *r) \ | |
729 | { grxctx_##rr *g = r; return (XSALSA20_TELLU64(rr, &g->ctx)); } \ | |
730 | \ | |
731 | static void grx_setnonce_##rr(void *r, const void *n) \ | |
732 | { grxctx_##rr *g = r; XSALSA20_SETNONCE(rr, &g->ctx, n); } \ | |
733 | \ | |
734 | static void grxdestroy_##rr(grand *r) \ | |
735 | { grxctx_##rr *g = (grxctx_##rr *)r; BURN(*g); S_DESTROY(g); } \ | |
736 | \ | |
737 | static void grx_generate_##rr(void *r, void *b, size_t sz) \ | |
738 | { grxctx_##rr *g = r; XSALSA20_ENCRYPT(rr, &g->ctx, 0, b, sz); } \ | |
739 | \ | |
740 | static const grops grxops_##rr = \ | |
741 | { XSALSA20_NONCESZ, grx_seek_##rr, grx_tell_##rr, \ | |
742 | grx_setnonce_##rr, grx_generate_##rr }; \ | |
743 | \ | |
744 | static const grand_ops grxops_rand_##rr = { \ | |
745 | "x" SALSA20_NAME_##rr, GRAND_CRYPTO, 0, \ | |
746 | grmisc, grxdestroy_##rr, grword, \ | |
44ff6c11 | 747 | grbyte, grword, grand_defaultrange, grfill \ |
194e93f2 MW |
748 | }; \ |
749 | \ | |
750 | grand *SALSA20_DECOR(xsalsa20, rr, _rand) \ | |
751 | (const void *k, size_t ksz, const void *n) \ | |
752 | { \ | |
753 | grxctx_##rr *g = S_CREATE(g); \ | |
754 | g->r.r.ops = &grxops_rand_##rr; \ | |
755 | g->r.ops = &grxops_##rr; \ | |
756 | XSALSA20_INIT(rr, &g->ctx, k, ksz, n); \ | |
757 | return (&g->r.r); \ | |
758 | } | |
759 | SALSA20_VARS(DEFXGRAND) | |
760 | ||
761 | /*----- Test rig ----------------------------------------------------------*/ | |
762 | ||
763 | #ifdef TEST_RIG | |
764 | ||
765 | #include <stdio.h> | |
766 | #include <string.h> | |
767 | ||
768 | #include <mLib/quis.h> | |
769 | #include <mLib/testrig.h> | |
770 | ||
a4c2e267 MW |
771 | static const int perm[] = { |
772 | 0, 13, 10, 7, | |
773 | 4, 1, 14, 11, | |
774 | 8, 5, 2, 15, | |
775 | 12, 9, 6, 3 | |
776 | }; | |
777 | ||
194e93f2 MW |
778 | #define DEFVCORE(r) \ |
779 | static int v_core_##r(dstr *v) \ | |
780 | { \ | |
781 | salsa20_matrix a, b; \ | |
782 | dstr d = DSTR_INIT; \ | |
a4c2e267 | 783 | int i, j, n; \ |
194e93f2 MW |
784 | int ok = 1; \ |
785 | \ | |
786 | DENSURE(&d, SALSA20_OUTSZ); d.len = SALSA20_OUTSZ; \ | |
787 | n = *(int *)v[0].buf; \ | |
788 | for (i = 0; i < SALSA20_OUTSZ/4; i++) \ | |
a4c2e267 | 789 | b[i] = LOAD32_L(v[1].buf + 4*i); \ |
194e93f2 | 790 | for (i = 0; i < n; i++) { \ |
a4c2e267 | 791 | for (j = 0; j < 16; j++) a[perm[j]] = b[j]; \ |
194e93f2 MW |
792 | core(r, a, b); \ |
793 | memcpy(a, b, sizeof(a)); \ | |
794 | } \ | |
a4c2e267 | 795 | for (i = 0; i < SALSA20_OUTSZ/4; i++) STORE32_L(d.buf + 4*i, b[i]); \ |
194e93f2 MW |
796 | \ |
797 | if (d.len != v[2].len || memcmp(d.buf, v[2].buf, v[2].len) != 0) { \ | |
798 | ok = 0; \ | |
799 | printf("\nfail core:" \ | |
800 | "\n\titerations = %d" \ | |
801 | "\n\tin = ", n); \ | |
802 | type_hex.dump(&v[1], stdout); \ | |
803 | printf("\n\texpected = "); \ | |
804 | type_hex.dump(&v[2], stdout); \ | |
805 | printf("\n\tcalculated = "); \ | |
806 | type_hex.dump(&d, stdout); \ | |
807 | putchar('\n'); \ | |
808 | } \ | |
809 | \ | |
810 | dstr_destroy(&d); \ | |
811 | return (ok); \ | |
812 | } | |
813 | SALSA20_VARS(DEFVCORE) | |
814 | ||
815 | #define SALSA20_CTX(r) salsa20_ctx | |
816 | #define SALSA20_INIT(r, ctx, k, ksz, n) salsa20_init(ctx, k, ksz, n) | |
817 | #define SALSA20_SEEKU64(r, ctx, i) salsa20_seeku64(ctx, i) | |
818 | ||
819 | #define DEFxVENC(base, BASE, r) \ | |
820 | static int v_encrypt_##base##_##r(dstr *v) \ | |
821 | { \ | |
822 | BASE##_CTX(r) ctx; \ | |
823 | dstr d = DSTR_INIT; \ | |
824 | kludge64 pos; \ | |
825 | const octet *p, *p0; \ | |
826 | octet *q; \ | |
827 | size_t sz, sz0, step; \ | |
828 | unsigned long skip; \ | |
829 | int ok = 1; \ | |
830 | \ | |
831 | if (v[4].len) { p0 = (const octet *)v[4].buf; sz0 = v[4].len; } \ | |
832 | else { p0 = 0; sz0 = v[5].len; } \ | |
833 | DENSURE(&d, sz0); d.len = sz0; \ | |
834 | skip = *(unsigned long *)v[3].buf; \ | |
835 | \ | |
836 | step = 0; \ | |
837 | while (step < sz0 + skip) { \ | |
838 | step = step ? 3*step + 4 : 1; \ | |
839 | if (step > sz0 + skip) step = sz0 + skip; \ | |
840 | BASE##_INIT(r, &ctx, v[0].buf, v[0].len, v[1].buf); \ | |
841 | if (v[2].len) { \ | |
842 | LOAD64_(pos, v[2].buf); \ | |
843 | BASE##_SEEKU64(r, &ctx, pos); \ | |
844 | } \ | |
845 | \ | |
846 | for (sz = skip; sz >= step; sz -= step) \ | |
847 | BASE##_ENCRYPT(r, &ctx, 0, 0, step); \ | |
848 | if (sz) BASE##_ENCRYPT(r, &ctx, 0, 0, sz); \ | |
849 | for (p = p0, q = (octet *)d.buf, sz = sz0; \ | |
850 | sz >= step; \ | |
851 | sz -= step, q += step) { \ | |
852 | BASE##_ENCRYPT(r, &ctx, p, q, step); \ | |
853 | if (p) p += step; \ | |
854 | } \ | |
855 | if (sz) BASE##_ENCRYPT(r, &ctx, p, q, sz); \ | |
856 | \ | |
857 | if (d.len != v[5].len || memcmp(d.buf, v[5].buf, v[5].len) != 0) { \ | |
858 | ok = 0; \ | |
859 | printf("\nfail encrypt:" \ | |
860 | "\n\tstep = %lu" \ | |
861 | "\n\tkey = ", (unsigned long)step); \ | |
862 | type_hex.dump(&v[0], stdout); \ | |
863 | printf("\n\tnonce = "); \ | |
864 | type_hex.dump(&v[1], stdout); \ | |
865 | printf("\n\tposition = "); \ | |
866 | type_hex.dump(&v[2], stdout); \ | |
867 | printf("\n\tskip = %lu", skip); \ | |
868 | printf("\n\tmessage = "); \ | |
869 | type_hex.dump(&v[4], stdout); \ | |
870 | printf("\n\texpected = "); \ | |
871 | type_hex.dump(&v[5], stdout); \ | |
872 | printf("\n\tcalculated = "); \ | |
873 | type_hex.dump(&d, stdout); \ | |
874 | putchar('\n'); \ | |
875 | } \ | |
876 | } \ | |
877 | \ | |
878 | dstr_destroy(&d); \ | |
879 | return (ok); \ | |
880 | } | |
881 | #define DEFVENC(r) DEFxVENC(salsa20, SALSA20, r) | |
882 | #define DEFXVENC(r) DEFxVENC(xsalsa20, XSALSA20, r) | |
883 | SALSA20_VARS(DEFVENC) | |
884 | SALSA20_VARS(DEFXVENC) | |
885 | ||
886 | static test_chunk defs[] = { | |
887 | #define DEFxTAB(pre, base, r) \ | |
888 | { pre SALSA20_NAME_##r, v_encrypt_##base##_##r, \ | |
889 | { &type_hex, &type_hex, &type_hex, &type_ulong, \ | |
890 | &type_hex, &type_hex, 0 } }, | |
891 | #define DEFTAB(r) \ | |
892 | { SALSA20_NAME_##r "-core", v_core_##r, \ | |
893 | { &type_int, &type_hex, &type_hex, 0 } }, \ | |
894 | DEFxTAB("", salsa20, r) | |
895 | #define DEFXTAB(r) DEFxTAB("x", xsalsa20, r) | |
896 | SALSA20_VARS(DEFTAB) | |
897 | SALSA20_VARS(DEFXTAB) | |
898 | { 0, 0, { 0 } } | |
899 | }; | |
900 | ||
901 | int main(int argc, char *argv[]) | |
902 | { | |
903 | test_run(argc, argv, defs, SRCDIR"/t/salsa20"); | |
904 | return (0); | |
905 | } | |
906 | ||
907 | #endif | |
908 | ||
909 | /*----- That's all, folks -------------------------------------------------*/ |