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1 | /* -*-c-*- |
2 | * | |
3 | * The GCM authenticated encryption mode | |
4 | * | |
5 | * (c) 2018 Straylight/Edgeware | |
6 | */ | |
7 | ||
8 | /*----- Licensing notice --------------------------------------------------* | |
9 | * | |
10 | * This file is part of Catacomb. | |
11 | * | |
12 | * Catacomb is free software: you can redistribute it and/or modify it | |
13 | * under the terms of the GNU Library General Public License as published | |
14 | * by the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * Catacomb is distributed in the hope that it will be useful, but | |
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | * Library General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU Library General Public | |
23 | * License along with Catacomb. If not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
25 | * USA. | |
26 | */ | |
27 | ||
28 | #ifndef CATACOMB_GCM_DEF_H | |
29 | #define CATACOMB_GCM_DEF_H | |
30 | ||
31 | #ifdef __cplusplus | |
32 | extern "C" { | |
33 | #endif | |
34 | ||
35 | /*----- Header files ------------------------------------------------------*/ | |
36 | ||
37 | #include <string.h> | |
38 | ||
39 | #include <mLib/bits.h> | |
40 | #include <mLib/sub.h> | |
41 | ||
42 | #ifndef CATACOMB_ARENA_H | |
43 | # include "arena.h" | |
44 | #endif | |
45 | ||
46 | #ifndef CATACOMB_BLKC_H | |
47 | # include "blkc.h" | |
48 | #endif | |
49 | ||
50 | #ifndef CATACOMB_CT_H | |
51 | # include "ct.h" | |
52 | #endif | |
53 | ||
54 | #ifndef CATACOMB_KEYSZ_H | |
55 | # include "keysz.h" | |
56 | #endif | |
57 | ||
58 | #ifndef CATACOMB_PARANOIA_H | |
59 | # include "paranoia.h" | |
60 | #endif | |
61 | ||
62 | #ifndef CATACOMB_RSVR_H | |
63 | # include "rsvr.h" | |
64 | #endif | |
65 | ||
66 | /*----- Type definitions --------------------------------------------------*/ | |
67 | ||
68 | typedef struct gcm_params { | |
69 | unsigned f; /* flags */ | |
70 | #define GCMF_SWAP 1u /* swap byte order? */ | |
71 | unsigned n; /* number of words in block */ | |
72 | uint32 poly; /* selected polynomial mask */ | |
73 | } gcm_params; | |
74 | ||
75 | /*----- Utilities ---------------------------------------------------------*/ | |
76 | ||
77 | /* Supported block sizes. */ | |
78 | #define GCM_WIDTHS(_) _(64) _(96) _(128) _(192) _(256) | |
79 | #define GCM_NMAX 8 | |
80 | ||
81 | /* Polynomial tails for the supported block sizes. */ | |
82 | #define GCM_POLY_64 0xd8000000 | |
83 | #define GCM_POLY_96 0x82600000 | |
84 | #define GCM_POLY_128 0xe1000000 | |
85 | #define GCM_POLY_192 0xe1000000 | |
86 | #define GCM_POLY_256 0xa4200000 | |
87 | ||
88 | /* Determine whether to set the @GCMF_SWAP@ flag. */ | |
89 | #define GCM_SWAP_L GCMF_SWAP | |
90 | #define GCM_SWAP_B 0 | |
91 | ||
92 | /* --- @gcm_mktable@ --- * | |
93 | * | |
94 | * Arguments: @const gcm_params *p@ = pointer to the parameters | |
95 | * @uint32 *ktab@ = where to write the table; there must be | |
96 | * space for %$32 n$% $%n$%-word entries, i.e., | |
97 | * %$32 n^2$% 32-bit words in total, where %$n$% is | |
98 | * @p->n@, the block size in words | |
99 | * @const uint32 *k@ = input field element | |
100 | * | |
101 | * Returns: --- | |
102 | * | |
103 | * Use: Construct a table for use by @gcm_mulk_...@ below, to | |
104 | * multiply (vaguely) efficiently by @k@. | |
105 | */ | |
106 | ||
107 | extern void gcm_mktable(const gcm_params */*p*/, | |
108 | uint32 */*ktab*/, const uint32 */*k*/); | |
109 | ||
110 | /* --- @gcm_mulk_N@ --- * | |
111 | * | |
112 | * Arguments: @uint32 *a@ = accumulator to multiply | |
113 | * @const uint32 *ktab@ = table constructed by @gcm_mktable@ | |
114 | * | |
115 | * Returns: --- | |
116 | * | |
117 | * Use: Multiply @a@ by @k@ (implicitly represented in @ktab@), | |
118 | * updating @a@ in-place. There are separate functions for each | |
119 | * supported block size because this is the function whose | |
120 | * performance actually matters. | |
121 | */ | |
122 | ||
123 | #define GCM_DECL_MULK(nbits) \ | |
124 | extern void gcm_mulk_##nbits(uint32 */*a*/, const uint32 */*ktab*/); | |
125 | GCM_WIDTHS(GCM_DECL_MULK) | |
126 | #undef GCM_DECL_MULK | |
127 | ||
128 | /* Dispatch to the appropriate variant of @gcm_mulk@. */ | |
129 | #define GCM_MULK(PRE, a, ktab) BLKC_GLUE(gcm_mulk_, BLKC_BITS(PRE))(a, ktab) | |
130 | ||
131 | /* --- @gcm_ghashdone@ --- * | |
132 | * | |
133 | * Arguments: @const gcm_params *p@ = pointer to the parameters | |
134 | * @uint32 *a@ = GHASH accumulator | |
135 | * @const uint32 *ktab@ = multiplication table, built by | |
136 | * @gcm_mktable@ | |
137 | * @unsigned long xblocks, yblocks@ = number of whole blocks in | |
138 | * the two inputs | |
139 | * @unsigned xbytes, ybytes@ = number of trailing bytes in the | |
140 | * two inputs | |
141 | * | |
142 | * Returns: --- | |
143 | * | |
144 | * Use: Finishes a GHASH operation by appending the appropriately | |
145 | * encoded lengths of the two constituent messages. | |
146 | */ | |
147 | ||
148 | extern void gcm_ghashdone(const gcm_params */*p*/, | |
149 | uint32 */*a*/, const uint32 */*ktab*/, | |
150 | unsigned long /*xblocks*/, unsigned /*xbytes*/, | |
151 | unsigned long /*yblocks*/, unsigned /*ybytes*/); | |
152 | ||
153 | /* --- @gcm_concat@ --- * | |
154 | * | |
155 | * Arguments: @const gcm_params *p@ = pointer to the parameters | |
156 | * @uint32 *z@ = GHASH accumulator for suffix, updated | |
157 | * @const uint32 *x@ = GHASH accumulator for prefix | |
158 | * @const uint32 *ktab@ = multiplication table, built by | |
159 | * @gcm_mktable@ | |
160 | * @unsigned long n@ = length of suffix in whole blocks | |
161 | * | |
162 | * Returns: --- | |
163 | * | |
164 | * Use: On entry, @x@ and @z@ are the results of hashing two strings | |
165 | * %$a$% and %$b$%, each a whole number of blocks long; in | |
166 | * particular, %$b$% is @n@ blocks long. On exit, @z@ is | |
167 | * updated to be the hash of %$a \cat b$%. | |
168 | */ | |
169 | ||
170 | extern void gcm_concat(const gcm_params */*p*/, | |
171 | uint32 */*z*/, const uint32 */*x*/, | |
172 | const uint32 */*ktab*/, unsigned long /*n*/); | |
173 | ||
174 | /* Step the counter using GCM's strange only-the-last-32-bits convention. */ | |
175 | #define GCM_STEP(PRE, w) BLKC_GLUE(GCM_STEP_, BLKC_ENDIAN(PRE))(PRE, w) | |
176 | #define GCM_STEP_B(PRE, w) GCM_STEP_X(PRE, BLKC_ID, w) | |
177 | #define GCM_STEP_L(PRE, w) GCM_STEP_X(PRE, ENDSWAP32, w) | |
178 | #define GCM_STEP_X(PRE, op, w) do { \ | |
179 | BLKC_W(w); \ | |
180 | _w[PRE##_BLKSZ/4 - 1] = op(op(_w[PRE##_BLKSZ/4 - 1]) + 1); \ | |
181 | } while (0) | |
182 | ||
183 | /*----- Macros ------------------------------------------------------------*/ | |
184 | ||
185 | /* --- @GCM_DEF@ --- * | |
186 | * | |
187 | * Arguments: @PRE@, @pre@ = prefixes for the underlying block cipher | |
188 | * | |
189 | * Use: Creates an implementation for the GCM authenticated- | |
190 | * encryption mode. | |
191 | */ | |
192 | ||
193 | #define GCM_DEF(PRE, pre) GCM_DEFX(PRE, pre, #pre, #pre) | |
194 | ||
195 | #define GCM_DEFX(PRE, pre, name, fname) \ | |
196 | \ | |
197 | static const gcm_params pre##_gcmparams = { \ | |
198 | BLKC_GLUE(GCM_SWAP_, BLKC_ENDIAN(PRE)), \ | |
199 | PRE##_BLKSZ/4, \ | |
200 | BLKC_GLUE(GCM_POLY_, BLKC_BITS(PRE)) \ | |
201 | }; \ | |
202 | \ | |
203 | const octet \ | |
204 | pre##_gcmnoncesz[] = { KSZ_ANY, PRE##_BLKSZ - 4 }, \ | |
205 | pre##_gcmtagsz[] = { KSZ_RANGE, PRE##_BLKSZ, 0, PRE##_BLKSZ, 1 }; \ | |
206 | \ | |
207 | static const rsvr_policy pre##_gcmpolicy = { 0, PRE##_BLKSZ, PRE##_BLKSZ }; \ | |
208 | \ | |
209 | /* --- @pre_gcmsetkey@ --- * \ | |
210 | * \ | |
211 | * Arguments: @pre_gcmkey *key@ = pointer to key block to fill in \ | |
212 | * @const void *k@ = pointer to key material \ | |
213 | * @size_t ksz@ = size of key material \ | |
214 | * \ | |
215 | * Returns: --- \ | |
216 | * \ | |
217 | * Use: Initializes an GCM key block. \ | |
218 | */ \ | |
219 | \ | |
220 | void pre##_gcmsetkey(pre##_gcmkey *key, const void *k, size_t ksz) \ | |
221 | { \ | |
222 | uint32 t[PRE##_BLKSZ/4]; \ | |
223 | \ | |
224 | /* Initialize the block cipher. */ \ | |
225 | pre##_init(&key->ctx, k, ksz); \ | |
226 | \ | |
227 | /* Set up the GHASH multiplication table. */ \ | |
228 | BLKC_ZERO(PRE, t); pre##_eblk(&key->ctx, t, t); \ | |
229 | gcm_mktable(&pre##_gcmparams, key->ktab, t); \ | |
230 | } \ | |
231 | \ | |
232 | /* --- @pre_gcmaadinit@ --- * \ | |
233 | * \ | |
234 | * Arguments: @pre_gcmaadctx *aad@ = pointer to AAD context \ | |
235 | * @const pre_gcmkey *key@ = pointer to key block \ | |
236 | * \ | |
237 | * Returns: --- \ | |
238 | * \ | |
239 | * Use: Initializes an GCM AAD (`additional authenticated \ | |
240 | * data') context associated with a given key. AAD \ | |
241 | * contexts can be copied and/or reused, saving time if \ | |
242 | * the AAD for a number of messages has a common prefix. \ | |
243 | * \ | |
244 | * The @key@ doesn't need to be kept around, though \ | |
245 | * usually there'll at least be another copy in some GCM \ | |
246 | * operation context because the AAD on its own isn't much \ | |
247 | * good. \ | |
248 | */ \ | |
249 | \ | |
250 | void pre##_gcmaadinit(pre##_gcmaadctx *aad, const pre##_gcmkey *key) \ | |
251 | { aad->k = *key; aad->off = 0; aad->len = 0; BLKC_ZERO(PRE, aad->a); } \ | |
252 | \ | |
253 | /* --- @pre_gcmaadhash@ --- * \ | |
254 | * \ | |
255 | * Arguments: @pre_gcmaadctx *aad@ = pointer to AAD context \ | |
256 | * @const void *p@ = pointer to AAD material \ | |
257 | * @size_t sz@ = length of AAD material \ | |
258 | * \ | |
259 | * Returns: --- \ | |
260 | * \ | |
261 | * Use: Feeds AAD into the context. \ | |
262 | */ \ | |
263 | \ | |
264 | void pre##_gcmaadhash(pre##_gcmaadctx *aad, const void *p, size_t sz) \ | |
265 | { \ | |
266 | rsvr_state st; \ | |
267 | const octet *q; \ | |
268 | \ | |
269 | rsvr_setup(&st, &pre##_gcmpolicy, aad->b, &aad->off, p, sz); \ | |
270 | RSVR_DO(&st) while ((q = RSVR_NEXT(&st, PRE##_BLKSZ)) != 0) { \ | |
271 | BLKC_XLOAD(PRE, aad->a, q); GCM_MULK(PRE, aad->a, aad->k.ktab); \ | |
272 | aad->len++; \ | |
273 | } \ | |
274 | } \ | |
275 | \ | |
276 | /* --- @pre_gcminit@ --- * \ | |
277 | * \ | |
278 | * Arguments: @pre_gcmctx *ctx@ = pointer to GCM context \ | |
279 | * @const pre_gcmkey *key@ = pointer to key block \ | |
280 | * @const void *n@ = pointer to nonce \ | |
281 | * @size_t nsz@ = size of nonce \ | |
282 | * \ | |
283 | * Returns: --- \ | |
284 | * \ | |
285 | * Use: Initialize an GCM operation context with a given key. \ | |
286 | * \ | |
287 | * The original key needn't be kept around any more. \ | |
288 | */ \ | |
289 | \ | |
290 | void pre##_gcminit(pre##_gcmctx *ctx, const pre##_gcmkey *k, \ | |
291 | const void *n, size_t nsz) \ | |
292 | { ctx->k = *k; pre##_gcmreinit(ctx, n, nsz); } \ | |
293 | \ | |
294 | /* --- @pre_gcmreinit@ --- * \ | |
295 | * \ | |
296 | * Arguments: @pre_gcmctx *ctx@ = pointer to GCM context \ | |
297 | * @const void *n@ = pointer to nonce \ | |
298 | * @size_t nsz@ = size of nonce \ | |
299 | * \ | |
300 | * Returns: --- \ | |
301 | * \ | |
302 | * Use: Reinitialize an GCM operation context, changing the \ | |
303 | * nonce. \ | |
304 | */ \ | |
305 | \ | |
306 | void pre##_gcmreinit(pre##_gcmctx *ctx, const void *n, size_t nsz) \ | |
307 | { \ | |
308 | octet b[PRE##_BLKSZ]; \ | |
309 | const octet *q = n; \ | |
310 | size_t nblocks; \ | |
311 | unsigned i; \ | |
312 | \ | |
313 | /* Zero the counters. */ \ | |
314 | ctx->off = 0; ctx->len = 0; \ | |
315 | BLKC_ZERO(PRE, ctx->a); \ | |
316 | \ | |
317 | /* Calculate the initial counter from the nonce. */ \ | |
318 | if (nsz == PRE##_BLKSZ - 4) { \ | |
319 | /* Easy version: initialize the final word to 1 and copy the \ | |
320 | * remaining words from the nonce. (The spec shows the nonce and \ | |
321 | * counter the other way around for 64-bit block ciphers, but I'm \ | |
322 | * sure this is just a mistake.) \ | |
323 | */ \ | |
324 | \ | |
325 | for (i = 0; i < PRE##_BLKSZ/4 - 1; i++) \ | |
326 | { ctx->c0[i] = BLKC_LOAD_E(PRE)(q); q += 4; } \ | |
327 | ctx->c0[PRE##_BLKSZ/4 - 1] = BLKC_BWORD(PRE, 1); \ | |
328 | } else { \ | |
329 | /* Harder version: hash the nonce down with GHASH. */ \ | |
330 | \ | |
331 | BLKC_ZERO(PRE, ctx->c0); nblocks = 0; \ | |
332 | while (nsz >= PRE##_BLKSZ) { \ | |
333 | BLKC_XLOAD(PRE, ctx->c0, q); q += PRE##_BLKSZ; \ | |
334 | GCM_MULK(PRE, ctx->c0, ctx->k.ktab); \ | |
335 | nsz -= PRE##_BLKSZ; nblocks++; \ | |
336 | } \ | |
337 | if (nsz) { \ | |
338 | memcpy(b, q, nsz); memset(b + nsz, 0, PRE##_BLKSZ - nsz); \ | |
339 | BLKC_XLOAD(PRE, ctx->c0, b); \ | |
340 | GCM_MULK(PRE, ctx->c0, ctx->k.ktab); \ | |
341 | } \ | |
342 | gcm_ghashdone(&pre##_gcmparams, ctx->c0, ctx->k.ktab, \ | |
343 | 0, 0, nblocks, nsz); \ | |
344 | } \ | |
345 | \ | |
346 | /* We must remember the initial counter for the final tag \ | |
347 | * calculation. (I conjecture that storing the final counter instead \ | |
348 | * would be just as secure, and require less state, but I've not \ | |
349 | * proven this, and anyway it wouldn't interoperate.) Copy it to \ | |
350 | * make the working counter. \ | |
351 | */ \ | |
352 | BLKC_MOVE(PRE, ctx->c, ctx->c0); \ | |
353 | } \ | |
354 | \ | |
355 | /* --- @pre_gcmencrypt@ --- * \ | |
356 | * \ | |
357 | * Arguments: @pre_gcmctx *ctx@ = pointer to GCM operation context \ | |
358 | * @const void *src@ = pointer to plaintext message chunk \ | |
359 | * @size_t sz@ = size of the plaintext \ | |
360 | * @buf *dst@ = a buffer to write the ciphertext to \ | |
361 | * \ | |
362 | * Returns: Zero on success; @-1@ on failure. \ | |
363 | * \ | |
364 | * Use: Encrypts a chunk of a plaintext message, writing a \ | |
365 | * chunk of ciphertext to the output buffer and updating \ | |
366 | * the operation state. \ | |
367 | * \ | |
368 | * For GCM, we always write a ciphertext chunk the same \ | |
369 | * size as the plaintext. The messing about with @buf@ \ | |
370 | * objects makes the interface consistent with other AEAD \ | |
371 | * schemes which can't do this. \ | |
372 | */ \ | |
373 | \ | |
374 | int pre##_gcmencrypt(pre##_gcmctx *ctx, \ | |
375 | const void *src, size_t sz, buf *dst) \ | |
376 | { \ | |
377 | rsvr_plan plan; \ | |
378 | uint32 t[PRE##_BLKSZ/4]; \ | |
379 | const octet *p = src; \ | |
380 | octet *q, *r, y; \ | |
381 | \ | |
382 | /* Allocate space for the ciphertext. */ \ | |
383 | if (sz) { q = buf_get(dst, sz); if (!q) return (-1); } \ | |
384 | else q = 0; \ | |
385 | \ | |
386 | /* Determine the buffering plan. Our buffer is going to do double- \ | |
387 | * duty here. The end portion is going to contain mask from the \ | |
388 | * encrypted counter which we mix into the plaintext to encrypt it; \ | |
389 | * the start portion, which originally mask bytes we've already used, \ | |
390 | * will hold the output ciphertext, which will eventually be \ | |
391 | * collected into the GHASH state. \ | |
392 | */ \ | |
393 | rsvr_mkplan(&plan, &pre##_gcmpolicy, ctx->off, sz); \ | |
394 | \ | |
395 | /* Initial portion, fulfilled from the buffer. If the buffer is \ | |
396 | * empty, then that means that we haven't yet encrypted the current \ | |
397 | * counter, so we should do that and advance it. \ | |
398 | */ \ | |
399 | if (plan.head) { \ | |
400 | if (!ctx->off) { \ | |
401 | GCM_STEP(PRE, ctx->c); pre##_eblk(&ctx->k.ctx, ctx->c, t); \ | |
402 | BLKC_STORE(PRE, ctx->b, t); \ | |
403 | } \ | |
404 | r = ctx->b + ctx->off; ctx->off += plan.head; \ | |
405 | while (plan.head--) { y = *p++ ^ *r; *r++ = *q++ = y; } \ | |
406 | } \ | |
407 | \ | |
408 | /* If we've filled up the buffer then we need to cycle the MAC and \ | |
409 | * reset the offset. \ | |
410 | */ \ | |
411 | if (plan.from_rsvr) { \ | |
412 | BLKC_XLOAD(PRE, ctx->a, ctx->b); GCM_MULK(PRE, ctx->a, ctx->k.ktab); \ | |
413 | ctx->len++; ctx->off = 0; \ | |
414 | } \ | |
415 | \ | |
416 | /* Now to process the main body of the input. */ \ | |
417 | while (plan.from_input) { \ | |
418 | GCM_STEP(PRE, ctx->c); pre##_eblk(&ctx->k.ctx, ctx->c, t); \ | |
419 | BLKC_XLOAD(PRE, t, p); p += PRE##_BLKSZ; \ | |
420 | BLKC_STORE(PRE, q, t); q += PRE##_BLKSZ; \ | |
421 | BLKC_XMOVE(PRE, ctx->a, t); GCM_MULK(PRE, ctx->a, ctx->k.ktab); \ | |
422 | plan.from_input -= PRE##_BLKSZ; ctx->len++; \ | |
423 | } \ | |
424 | \ | |
425 | /* Finally, deal with any final portion. If there is one, we know \ | |
426 | * that the buffer is empty: we must have filled it above, or this \ | |
427 | * would all count as `initial' data. \ | |
428 | */ \ | |
429 | if (plan.tail) { \ | |
430 | GCM_STEP(PRE, ctx->c); pre##_eblk(&ctx->k.ctx, ctx->c, t); \ | |
431 | BLKC_STORE(PRE, ctx->b, t); \ | |
432 | r = ctx->b; ctx->off += plan.tail; \ | |
433 | while (plan.tail--) { y = *p++ ^ *r; *r++ = *q++ = y; } \ | |
434 | } \ | |
435 | \ | |
436 | /* And we're done. */ \ | |
437 | return (0); \ | |
438 | } \ | |
439 | \ | |
440 | /* --- @pre_gcmdecrypt@ --- * \ | |
441 | * \ | |
442 | * Arguments: @pre_gcmctx *ctx@ = pointer to GCM operation context \ | |
443 | * @const void *src@ = pointer to ciphertext message chunk \ | |
444 | * @size_t sz@ = size of the ciphertext \ | |
445 | * @buf *dst@ = a buffer to write the plaintext to \ | |
446 | * \ | |
447 | * Returns: Zero on success; @-1@ on failure. \ | |
448 | * \ | |
449 | * Use: Decrypts a chunk of a ciphertext message, writing a \ | |
450 | * chunk of plaintext to the output buffer and updating \ | |
451 | * the operation state. \ | |
452 | * \ | |
453 | * For GCM, we always write a plaintext chunk the same \ | |
454 | * size as the ciphertext. The messing about with @buf@ \ | |
455 | * objects makes the interface consistent with other AEAD \ | |
456 | * schemes which can't do this. \ | |
457 | */ \ | |
458 | \ | |
459 | int pre##_gcmdecrypt(pre##_gcmctx *ctx, \ | |
460 | const void *src, size_t sz, buf *dst) \ | |
461 | { \ | |
462 | rsvr_plan plan; \ | |
463 | uint32 t[PRE##_BLKSZ/4], u[PRE##_BLKSZ]; \ | |
464 | const octet *p = src; \ | |
465 | octet *q, *r, y; \ | |
466 | \ | |
467 | /* Allocate space for the plaintext. */ \ | |
468 | if (sz) { q = buf_get(dst, sz); if (!q) return (-1); } \ | |
469 | else q = 0; \ | |
470 | \ | |
471 | /* Determine the buffering plan. Our buffer is going to do double- \ | |
472 | * duty here. The end portion is going to contain mask from the \ | |
473 | * encrypted counter which we mix into the plaintext to encrypt it; \ | |
474 | * the start portion, which originally mask bytes we've already used, \ | |
475 | * will hold the input ciphertext, which will eventually be \ | |
476 | * collected into the GHASH state. \ | |
477 | */ \ | |
478 | rsvr_mkplan(&plan, &pre##_gcmpolicy, ctx->off, sz); \ | |
479 | \ | |
480 | /* Initial portion, fulfilled from the buffer. If the buffer is \ | |
481 | * empty, then that means that we haven't yet encrypted the current \ | |
482 | * counter, so we should do that and advance it. \ | |
483 | */ \ | |
484 | if (plan.head) { \ | |
485 | if (!ctx->off) { \ | |
486 | GCM_STEP(PRE, ctx->c); pre##_eblk(&ctx->k.ctx, ctx->c, t); \ | |
487 | BLKC_STORE(PRE, ctx->b, t); \ | |
488 | } \ | |
489 | r = ctx->b + ctx->off; ctx->off += plan.head; \ | |
490 | while (plan.head--) { y = *p++; *q++ = y ^ *r; *r++ = y; } \ | |
491 | } \ | |
492 | \ | |
493 | /* If we've filled up the buffer then we need to cycle the MAC and \ | |
494 | * reset the offset. \ | |
495 | */ \ | |
496 | if (plan.from_rsvr) { \ | |
497 | BLKC_XLOAD(PRE, ctx->a, ctx->b); GCM_MULK(PRE, ctx->a, ctx->k.ktab); \ | |
498 | ctx->len++; ctx->off = 0; \ | |
499 | } \ | |
500 | \ | |
501 | /* Now to process the main body of the input. */ \ | |
502 | while (plan.from_input) { \ | |
503 | GCM_STEP(PRE, ctx->c); pre##_eblk(&ctx->k.ctx, ctx->c, t); \ | |
504 | BLKC_LOAD(PRE, u, p); p += PRE##_BLKSZ; \ | |
505 | BLKC_XSTORE(PRE, q, t, u); q += PRE##_BLKSZ; \ | |
506 | BLKC_XMOVE(PRE, ctx->a, u); GCM_MULK(PRE, ctx->a, ctx->k.ktab); \ | |
507 | plan.from_input -= PRE##_BLKSZ; ctx->len++; \ | |
508 | } \ | |
509 | \ | |
510 | /* Finally, deal with any final portion. If there is one, we know \ | |
511 | * that the buffer is empty: we must have filled it above, or this \ | |
512 | * would all count as `initial' data. \ | |
513 | */ \ | |
514 | if (plan.tail) { \ | |
515 | GCM_STEP(PRE, ctx->c); pre##_eblk(&ctx->k.ctx, ctx->c, t); \ | |
516 | BLKC_STORE(PRE, ctx->b, t); \ | |
517 | r = ctx->b; ctx->off += plan.tail; \ | |
518 | while (plan.tail--) { y = *p++; *q++ = y ^ *r; *r++ = y; } \ | |
519 | } \ | |
520 | \ | |
521 | /* And we're done. */ \ | |
522 | return (0); \ | |
523 | } \ | |
524 | \ | |
525 | /* --- @pre_gcmtag@ --- * \ | |
526 | * \ | |
527 | * Arguments: @pre_gcmctx *ctx@ = pointer to an GCM context \ | |
528 | * @const pre_gcmaadctx *aad@ = pointer to AAD context, or \ | |
529 | * null \ | |
530 | * @octet *t@ = where to write a (full-length) tag \ | |
531 | * \ | |
532 | * Returns: --- \ | |
533 | * \ | |
534 | * Use: Finishes an GCM operation, by calculating the tag. \ | |
535 | */ \ | |
536 | \ | |
537 | static void pre##_gcmtag(pre##_gcmctx *ctx, \ | |
538 | const pre##_gcmaadctx *aad, octet *t) \ | |
539 | { \ | |
540 | octet b[PRE##_BLKSZ]; \ | |
541 | uint32 u[PRE##_BLKSZ/4]; \ | |
542 | unsigned long n; \ | |
543 | \ | |
544 | /* Finish tagging the ciphertext. */ \ | |
545 | if (ctx->off) { \ | |
546 | memcpy(b, ctx->b, ctx->off); \ | |
547 | memset(b + ctx->off, 0, PRE##_BLKSZ - ctx->off); \ | |
548 | BLKC_XLOAD(PRE, ctx->a, b); GCM_MULK(PRE, ctx->a, ctx->k.ktab); \ | |
549 | } \ | |
550 | \ | |
551 | /* If there's no AAD, because the pointer is null or no data was \ | |
552 | * supplied, then apply that to the GHASH state. (Otherwise there's \ | |
553 | * nothing to do here.) \ | |
554 | */ \ | |
555 | if (aad && (aad->len || aad->off)) { \ | |
556 | BLKC_MOVE(PRE, u, aad->a); \ | |
557 | if (aad->off) { \ | |
558 | memcpy(b, aad->b, aad->off); \ | |
559 | memset(b + aad->off, 0, PRE##_BLKSZ - aad->off); \ | |
560 | BLKC_XLOAD(PRE, u, b); GCM_MULK(PRE, u, ctx->k.ktab); \ | |
561 | } \ | |
562 | n = ctx->len; if (ctx->off) n++; \ | |
563 | gcm_concat(&pre##_gcmparams, ctx->a, u, ctx->k.ktab, n); \ | |
564 | } \ | |
565 | \ | |
566 | /* Finish off the hash by appending the length. */ \ | |
567 | gcm_ghashdone(&pre##_gcmparams, ctx->a, ctx->k.ktab, \ | |
568 | aad ? aad->len : 0, aad ? aad->off : 0, \ | |
569 | ctx->len, ctx->off); \ | |
570 | \ | |
571 | /* Mask the hash and store. */ \ | |
572 | pre##_eblk(&ctx->k.ctx, ctx->c0, u); \ | |
573 | BLKC_XSTORE(PRE, t, ctx->a, u); \ | |
574 | } \ | |
575 | \ | |
576 | /* --- @pre_gcmencryptdone@ --- * \ | |
577 | * \ | |
578 | * Arguments: @pre_gcmctx *ctx@ = pointer to an GCM context \ | |
579 | * @const pre_gcmaadctx *aad@ = pointer to AAD context, or \ | |
580 | * null \ | |
581 | * @buf *dst@ = buffer for remaining ciphertext \ | |
582 | * @void *tag@ = where to write the tag \ | |
583 | * @size_t tsz@ = length of tag to store \ | |
584 | * \ | |
585 | * Returns: Zero on success; @-1@ on failure. \ | |
586 | * \ | |
587 | * Use: Completes an GCM encryption operation. The @aad@ \ | |
588 | * pointer may be null if there is no additional \ | |
589 | * authenticated data. GCM doesn't buffer ciphertext, but \ | |
590 | * the output buffer is provided anyway for consistency \ | |
591 | * with other AEAD schemes which don't have this property; \ | |
592 | * the function will fail if the output buffer is broken. \ | |
593 | */ \ | |
594 | \ | |
595 | int pre##_gcmencryptdone(pre##_gcmctx *ctx, \ | |
596 | const pre##_gcmaadctx *aad, buf *dst, \ | |
597 | void *tag, size_t tsz) \ | |
598 | { \ | |
599 | octet t[PRE##_BLKSZ]; \ | |
600 | \ | |
601 | if (tsz > PRE##_BLKSZ) return (-1); \ | |
602 | if (!BOK(dst)) return (-1); \ | |
603 | pre##_gcmtag(ctx, aad, t); memcpy(tag, t, tsz); \ | |
604 | return (0); \ | |
605 | } \ | |
606 | \ | |
607 | /* --- @pre_gcmdecryptdone@ --- * \ | |
608 | * \ | |
609 | * Arguments: @pre_gcmctx *ctx@ = pointer to an GCM context \ | |
610 | * @const pre_gcmaadctx *aad@ = pointer to AAD context, or \ | |
611 | * null \ | |
612 | * @buf *dst@ = buffer for remaining plaintext \ | |
613 | * @const void *tag@ = tag to verify \ | |
614 | * @size_t tsz@ = length of tag \ | |
615 | * \ | |
616 | * Returns: @+1@ for complete success; @0@ if tag verification \ | |
617 | * failed; @-1@ for other kinds of errors. \ | |
618 | * \ | |
619 | * Use: Completes an GCM decryption operation. The @aad@ \ | |
620 | * pointer may be null if there is no additional \ | |
621 | * authenticated data. GCM doesn't buffer plaintext, but \ | |
622 | * the output buffer is provided anyway for consistency \ | |
623 | * with other AEAD schemes which don't have this property; \ | |
624 | * the function will fail if the output buffer is broken. \ | |
625 | */ \ | |
626 | \ | |
627 | int pre##_gcmdecryptdone(pre##_gcmctx *ctx, \ | |
628 | const pre##_gcmaadctx *aad, buf *dst, \ | |
629 | const void *tag, size_t tsz) \ | |
630 | { \ | |
631 | octet t[PRE##_BLKSZ]; \ | |
632 | \ | |
633 | if (tsz > PRE##_BLKSZ) return (-1); \ | |
634 | if (!BOK(dst)) return (-1); \ | |
635 | pre##_gcmtag(ctx, aad, t); \ | |
636 | if (!ct_memeq(tag, t, tsz)) return (0); \ | |
637 | else return (+1); \ | |
638 | } \ | |
639 | \ | |
640 | /* --- Generic AEAD interface --- */ \ | |
641 | \ | |
642 | typedef struct gactx { \ | |
643 | gaead_aad a; \ | |
644 | pre##_gcmaadctx aad; \ | |
645 | } gactx; \ | |
646 | \ | |
647 | static gaead_aad *gadup(const gaead_aad *a) \ | |
648 | { gactx *aad = S_CREATE(gactx); *aad = *(gactx *)a; return (&aad->a); } \ | |
649 | \ | |
650 | static void gahash(gaead_aad *a, const void *h, size_t hsz) \ | |
651 | { gactx *aad = (gactx *)a; pre##_gcmaadhash(&aad->aad, h, hsz); } \ | |
652 | \ | |
653 | static void gadestroy(gaead_aad *a) \ | |
654 | { gactx *aad = (gactx *)a; BURN(*aad); S_DESTROY(aad); } \ | |
655 | \ | |
656 | static const gaead_aadops gaops = \ | |
657 | { &pre##_gcm, gadup, gahash, gadestroy }; \ | |
658 | \ | |
659 | static gaead_aad *gaad(const pre##_gcmkey *k) \ | |
660 | { \ | |
661 | gactx *aad = S_CREATE(gactx); \ | |
662 | aad->a.ops = &gaops; \ | |
663 | pre##_gcmaadinit(&aad->aad, k); \ | |
664 | return (&aad->a); \ | |
665 | } \ | |
666 | \ | |
667 | typedef struct gectx { \ | |
668 | gaead_enc e; \ | |
669 | pre##_gcmctx ctx; \ | |
670 | } gectx; \ | |
671 | \ | |
672 | static gaead_aad *geaad(gaead_enc *e) \ | |
673 | { gectx *enc = (gectx *)e; return (gaad(&enc->ctx.k)); } \ | |
674 | \ | |
675 | static int gereinit(gaead_enc *e, const void *n, size_t nsz, \ | |
676 | size_t hsz, size_t msz, size_t tsz) \ | |
677 | { \ | |
678 | gectx *enc = (gectx *)e; \ | |
679 | \ | |
680 | if (tsz > PRE##_BLKSZ) return (-1); \ | |
681 | pre##_gcmreinit(&enc->ctx, n, nsz); \ | |
682 | return (0); \ | |
683 | } \ | |
684 | \ | |
685 | static int geenc(gaead_enc *e, const void *m, size_t msz, buf *b) \ | |
686 | { \ | |
687 | gectx *enc = (gectx *)e; \ | |
688 | return (pre##_gcmencrypt(&enc->ctx, m, msz, b)); \ | |
689 | } \ | |
690 | \ | |
691 | static int gedone(gaead_enc *e, const gaead_aad *a, \ | |
692 | buf *b, void *t, size_t tsz) \ | |
693 | { \ | |
694 | gectx *enc = (gectx *)e; gactx *aad = (gactx *)a; \ | |
695 | assert(!a || a->ops == &gaops); \ | |
696 | return (pre##_gcmencryptdone(&enc->ctx, a ? &aad->aad : 0, b, t, tsz)); \ | |
697 | } \ | |
698 | \ | |
699 | static void gedestroy(gaead_enc *e) \ | |
700 | { gectx *enc = (gectx *)e; BURN(*enc); S_DESTROY(enc); } \ | |
701 | \ | |
702 | static const gaead_encops geops = \ | |
703 | { &pre##_gcm, geaad, gereinit, geenc, gedone, gedestroy }; \ | |
704 | \ | |
705 | typedef struct gdctx { \ | |
706 | gaead_dec d; \ | |
707 | pre##_gcmctx ctx; \ | |
708 | } gdctx; \ | |
709 | \ | |
710 | static gaead_aad *gdaad(gaead_dec *d) \ | |
711 | { gdctx *dec = (gdctx *)d; return (gaad(&dec->ctx.k)); } \ | |
712 | \ | |
713 | static int gdreinit(gaead_dec *d, const void *n, size_t nsz, \ | |
714 | size_t hsz, size_t csz, size_t tsz) \ | |
715 | { \ | |
716 | gdctx *dec = (gdctx *)d; \ | |
717 | \ | |
718 | if (tsz > PRE##_BLKSZ) return (-1); \ | |
719 | pre##_gcmreinit(&dec->ctx, n, nsz); \ | |
720 | return (0); \ | |
721 | } \ | |
722 | \ | |
723 | static int gddec(gaead_dec *d, const void *c, size_t csz, buf *b) \ | |
724 | { \ | |
725 | gdctx *dec = (gdctx *)d; \ | |
726 | return (pre##_gcmdecrypt(&dec->ctx, c, csz, b)); \ | |
727 | } \ | |
728 | \ | |
729 | static int gddone(gaead_dec *d, const gaead_aad *a, \ | |
730 | buf *b, const void *t, size_t tsz) \ | |
731 | { \ | |
732 | gdctx *dec = (gdctx *)d; gactx *aad = (gactx *)a; \ | |
733 | assert(!a || a->ops == &gaops); \ | |
734 | return (pre##_gcmdecryptdone(&dec->ctx, a ? &aad->aad : 0, b, t, tsz)); \ | |
735 | } \ | |
736 | \ | |
737 | static void gddestroy(gaead_dec *d) \ | |
738 | { gdctx *dec = (gdctx *)d; BURN(*dec); S_DESTROY(dec); } \ | |
739 | \ | |
740 | static const gaead_decops gdops = \ | |
741 | { &pre##_gcm, gdaad, gdreinit, gddec, gddone, gddestroy }; \ | |
742 | \ | |
743 | typedef struct gkctx { \ | |
744 | gaead_key k; \ | |
745 | pre##_gcmkey key; \ | |
746 | } gkctx; \ | |
747 | \ | |
748 | static gaead_aad *gkaad(const gaead_key *k) \ | |
749 | { gkctx *key = (gkctx *)k; return (gaad(&key->key)); } \ | |
750 | \ | |
751 | static gaead_enc *gkenc(const gaead_key *k, const void *n, size_t nsz, \ | |
752 | size_t hsz, size_t msz, size_t tsz) \ | |
753 | { \ | |
754 | gkctx *key = (gkctx *)k; \ | |
755 | gectx *enc = S_CREATE(gectx); \ | |
756 | \ | |
757 | enc->e.ops = &geops; \ | |
758 | pre##_gcminit(&enc->ctx, &key->key, n, nsz); \ | |
759 | return (&enc->e); \ | |
760 | } \ | |
761 | \ | |
762 | static gaead_dec *gkdec(const gaead_key *k, const void *n, size_t nsz, \ | |
763 | size_t hsz, size_t csz, size_t tsz) \ | |
764 | { \ | |
765 | gkctx *key = (gkctx *)k; \ | |
766 | gdctx *dec = S_CREATE(gdctx); \ | |
767 | \ | |
768 | dec->d.ops = &gdops; \ | |
769 | pre##_gcminit(&dec->ctx, &key->key, n, nsz); \ | |
770 | return (&dec->d); \ | |
771 | } \ | |
772 | \ | |
773 | static void gkdestroy(gaead_key *k) \ | |
774 | { gkctx *key = (gkctx *)k; BURN(*key); S_DESTROY(key); } \ | |
775 | \ | |
776 | static const gaead_keyops gkops = \ | |
777 | { &pre##_gcm, gkaad, gkenc, gkdec, gkdestroy }; \ | |
778 | \ | |
779 | static gaead_key *gckey(const void *k, size_t ksz) \ | |
780 | { \ | |
781 | gkctx *key = S_CREATE(gkctx); \ | |
782 | key->k.ops = &gkops; \ | |
783 | pre##_gcmsetkey(&key->key, k, ksz); \ | |
784 | return (&key->k); \ | |
785 | } \ | |
786 | \ | |
787 | const gcaead pre##_gcm = { \ | |
788 | name "-gcm", \ | |
789 | pre##_keysz, pre##_gcmnoncesz, pre##_gcmtagsz, \ | |
790 | PRE##_BLKSZ, 0, 0, 0, \ | |
791 | gckey \ | |
792 | }; \ | |
793 | \ | |
794 | GCM_TESTX(PRE, pre, name, fname) | |
795 | ||
796 | /*----- Test rig ----------------------------------------------------------*/ | |
797 | ||
798 | #define GCM_TEST(PRE, pre) GCM_TESTX(PRE, pre, #pre, #pre) | |
799 | ||
800 | /* --- @GCM_TEST@ --- * | |
801 | * | |
802 | * Arguments: @PRE, pre@ = prefixes for the underlying block cipher | |
803 | * | |
804 | * Use: Standard test rig for GCM functions. | |
805 | */ | |
806 | ||
807 | #ifdef TEST_RIG | |
808 | ||
809 | #include <stdio.h> | |
810 | ||
811 | #include <mLib/dstr.h> | |
812 | #include <mLib/quis.h> | |
813 | #include <mLib/testrig.h> | |
814 | ||
815 | #define GCM_TESTX(PRE, pre, name, fname) \ | |
816 | \ | |
817 | static int gcmverify(dstr *v) \ | |
818 | { \ | |
819 | pre##_gcmkey key; \ | |
820 | pre##_gcmaadctx aad; \ | |
821 | pre##_gcmctx ctx; \ | |
822 | int ok = 1, win; \ | |
823 | int i; \ | |
824 | octet *p; \ | |
825 | int szs[] = { 1, 7, 192, -1, 0 }, *ip; \ | |
826 | size_t hsz, msz; \ | |
827 | dstr d = DSTR_INIT, t = DSTR_INIT; \ | |
828 | buf b; \ | |
829 | \ | |
830 | dstr_ensure(&d, v[4].len > v[3].len ? v[4].len : v[3].len); \ | |
831 | dstr_ensure(&t, v[5].len); t.len = v[5].len; \ | |
832 | \ | |
833 | pre##_gcmsetkey(&key, v[0].buf, v[0].len); \ | |
834 | \ | |
835 | for (ip = szs; *ip; ip++) { \ | |
836 | \ | |
837 | pre##_gcminit(&ctx, &key, (octet *)v[1].buf, v[1].len); \ | |
838 | \ | |
839 | i = *ip; \ | |
840 | hsz = v[2].len; \ | |
841 | if (i == -1) i = hsz; \ | |
842 | if (i > hsz) continue; \ | |
843 | p = (octet *)v[2].buf; \ | |
844 | pre##_gcmaadinit(&aad, &key); \ | |
845 | while (hsz) { \ | |
846 | if (i > hsz) i = hsz; \ | |
847 | pre##_gcmaadhash(&aad, p, i); \ | |
848 | p += i; hsz -= i; \ | |
849 | } \ | |
850 | \ | |
851 | buf_init(&b, d.buf, d.sz); \ | |
852 | i = *ip; \ | |
853 | msz = v[3].len; \ | |
854 | if (i == -1) i = msz; \ | |
855 | if (i > msz) continue; \ | |
856 | p = (octet *)v[3].buf; \ | |
857 | while (msz) { \ | |
858 | if (i > msz) i = msz; \ | |
859 | if (pre##_gcmencrypt(&ctx, p, i, &b)) { \ | |
860 | puts("!! gcmencrypt reports failure"); \ | |
861 | goto fail_enc; \ | |
862 | } \ | |
863 | p += i; msz -= i; \ | |
864 | } \ | |
865 | \ | |
866 | if (pre##_gcmencryptdone(&ctx, &aad, &b, (octet *)t.buf, t.len)) { \ | |
867 | puts("!! gcmencryptdone reports failure"); \ | |
868 | goto fail_enc; \ | |
869 | } \ | |
870 | d.len = BLEN(&b); \ | |
871 | \ | |
872 | if (d.len != v[4].len || \ | |
873 | memcmp(d.buf, v[4].buf, v[4].len) != 0 || \ | |
874 | memcmp(t.buf, v[5].buf, v[5].len) != 0) { \ | |
875 | fail_enc: \ | |
876 | printf("\nfail encrypt:\n\tstep = %i", *ip); \ | |
877 | fputs("\n\tkey = ", stdout); type_hex.dump(&v[0], stdout); \ | |
878 | fputs("\n\tnonce = ", stdout); type_hex.dump(&v[1], stdout); \ | |
879 | fputs("\n\theader = ", stdout); type_hex.dump(&v[2], stdout); \ | |
880 | fputs("\n\tmessage = ", stdout); type_hex.dump(&v[3], stdout); \ | |
881 | fputs("\n\texp ct = ", stdout); type_hex.dump(&v[4], stdout); \ | |
882 | fputs("\n\tcalc ct = ", stdout); type_hex.dump(&d, stdout); \ | |
883 | fputs("\n\texp tag = ", stdout); type_hex.dump(&v[5], stdout); \ | |
884 | fputs("\n\tcalc tag = ", stdout); type_hex.dump(&t, stdout); \ | |
885 | putchar('\n'); \ | |
886 | ok = 0; \ | |
887 | } \ | |
888 | \ | |
889 | pre##_gcminit(&ctx, &key, (octet *)v[1].buf, v[1].len); \ | |
890 | \ | |
891 | buf_init(&b, d.buf, d.sz); \ | |
892 | i = *ip; \ | |
893 | msz = v[4].len; \ | |
894 | if (i == -1) i = msz; \ | |
895 | if (i > msz) continue; \ | |
896 | p = (octet *)v[4].buf; \ | |
897 | while (msz) { \ | |
898 | if (i > msz) i = msz; \ | |
899 | if (pre##_gcmdecrypt(&ctx, p, i, &b)) { \ | |
900 | puts("!! gcmdecrypt reports failure"); \ | |
901 | win = 0; goto fail_dec; \ | |
902 | } \ | |
903 | p += i; msz -= i; \ | |
904 | } \ | |
905 | \ | |
906 | win = pre##_gcmdecryptdone(&ctx, &aad, &b, \ | |
907 | (octet *)v[5].buf, v[5].len); \ | |
908 | if (win < 0) { \ | |
909 | puts("!! gcmdecryptdone reports failure"); \ | |
910 | goto fail_dec; \ | |
911 | } \ | |
912 | d.len = BLEN(&b); \ | |
913 | \ | |
914 | if (d.len != v[3].len || !win || \ | |
915 | memcmp(d.buf, v[3].buf, v[3].len) != 0) { \ | |
916 | fail_dec: \ | |
917 | printf("\nfail decrypt:\n\tstep = %i", *ip); \ | |
918 | fputs("\n\tkey = ", stdout); type_hex.dump(&v[0], stdout); \ | |
919 | fputs("\n\tnonce = ", stdout); type_hex.dump(&v[1], stdout); \ | |
920 | fputs("\n\theader = ", stdout); type_hex.dump(&v[2], stdout); \ | |
921 | fputs("\n\tciphertext = ", stdout); type_hex.dump(&v[4], stdout); \ | |
922 | fputs("\n\texp pt = ", stdout); type_hex.dump(&v[3], stdout); \ | |
923 | fputs("\n\tcalc pt = ", stdout); type_hex.dump(&d, stdout); \ | |
924 | fputs("\n\ttag = ", stdout); type_hex.dump(&v[5], stdout); \ | |
925 | printf("\n\tverify %s", win ? "ok" : "FAILED"); \ | |
926 | putchar('\n'); \ | |
927 | ok = 0; \ | |
928 | } \ | |
929 | } \ | |
930 | \ | |
931 | dstr_destroy(&d); dstr_destroy(&t); \ | |
932 | return (ok); \ | |
933 | } \ | |
934 | \ | |
935 | static test_chunk aeaddefs[] = { \ | |
936 | { name "-gcm", gcmverify, \ | |
937 | { &type_hex, &type_hex, &type_hex, &type_hex, \ | |
938 | &type_hex, &type_hex, 0 } }, \ | |
939 | { 0, 0, { 0 } } \ | |
940 | }; \ | |
941 | \ | |
942 | int main(int argc, char *argv[]) \ | |
943 | { \ | |
944 | ego(argv[0]); \ | |
945 | test_run(argc, argv, aeaddefs, SRCDIR"/t/" fname); \ | |
946 | return (0); \ | |
947 | } | |
948 | ||
949 | #else | |
950 | # define GCM_TESTX(PRE, pre, name, fname) | |
951 | #endif | |
952 | ||
953 | /*----- That's all, folks -------------------------------------------------*/ | |
954 | ||
955 | #ifdef __cplusplus | |
956 | } | |
957 | #endif | |
958 | ||
959 | #endif |