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1 | /* -*-c-*- |
2 | * | |
3 | * AEAD schemes based on Salsa20/ChaCha and Poly1305 | |
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_LATINPOLY_DEF_H | |
29 | #define CATACOMB_LATINPOLY_DEF_H | |
30 | ||
31 | #ifdef __cplusplus | |
32 | extern "C" { | |
33 | #endif | |
34 | ||
35 | /*----- Header files ------------------------------------------------------*/ | |
36 | ||
37 | #include <mLib/bits.h> | |
38 | #include <mLib/buf.h> | |
39 | #include <mLib/sub.h> | |
40 | ||
41 | #ifndef CATACOMB_ARENA_H | |
42 | # include "arena.h" | |
43 | #endif | |
44 | ||
45 | #ifndef CATACOMB_CT_H | |
46 | # include "ct.h" | |
47 | #endif | |
48 | ||
49 | #ifndef CATACOMB_GAEAD_H | |
50 | # include "gaead.h" | |
51 | #endif | |
52 | ||
53 | #ifndef CATACOMB_KEYSZ_H | |
54 | # include "keysz.h" | |
55 | #endif | |
56 | ||
57 | #ifndef CATACOMB_LATINPOLY_H | |
58 | # include "latinpoly.h" | |
59 | #endif | |
60 | ||
61 | #ifndef CATACOMB_PARANOIA_H | |
62 | # include "paranoia.h" | |
63 | #endif | |
64 | ||
65 | #ifndef CATACOMB_POLY1305_H | |
66 | # include "poly1305.h" | |
67 | #endif | |
68 | ||
69 | #ifndef CATACOMB_SALSA20_H | |
70 | # include "salsa20.h" | |
71 | #endif | |
72 | ||
73 | /*----- Data structures ---------------------------------------------------*/ | |
74 | ||
75 | typedef struct latinpoly_aad { | |
76 | gaead_aad a; | |
77 | poly1305_ctx poly; | |
78 | } latinpoly_aad; | |
79 | ||
80 | typedef struct latinpoly_key { | |
81 | gaead_key k; | |
82 | octet key[SALSA20_KEYSZ]; | |
83 | size_t ksz; | |
84 | } latinpoly_key; | |
85 | ||
86 | /*----- Common definitions ------------------------------------------------*/ | |
87 | ||
88 | /* Tables. */ | |
89 | extern const octet latinpoly_noncesz[], latinpoly_tagsz[]; | |
90 | ||
91 | /* AAD methods. */ | |
92 | extern void latinpoly_aadhash(gaead_aad */*a*/, | |
93 | const void */*h*/, size_t /*hsz*/); | |
94 | extern void latinpoly_aaddestroy(gaead_aad */*a*/); | |
95 | ||
96 | /* --- @latinpoly_tag@ --- * | |
97 | * | |
98 | * Arguments: @const poly1305_ctx *aad@ = Poly1305 context hashing AAD | |
99 | * @poly1305_ctx *ct@ = Poly1305 context hashing ciphertext | |
100 | * @void *tag@ = where to write the tag | |
101 | * | |
102 | * Returns: --- | |
103 | * | |
104 | * Use: Completes a Latin-dance-Poly1305 tag, combining the AAD and | |
105 | * ciphertext hashes, appending their lengths, and writing the | |
106 | * final masked hash to @tag@. The @ct@ context is clobbered. | |
107 | */ | |
108 | ||
109 | extern void latinpoly_tag(const poly1305_ctx */*aad*/, | |
110 | poly1305_ctx */*ct*/, void */*tag*/); | |
111 | ||
112 | /*----- Macros ------------------------------------------------------------*/ | |
113 | ||
114 | #define LATINPOLY_DEF(latin, base, name) \ | |
115 | \ | |
116 | /* Utilities. */ \ | |
117 | \ | |
118 | /* Reinitialize the stream cipher and hash state given a new nonce. */ \ | |
119 | static int reinit_##latin(x##latin##_ctx *ctx, \ | |
120 | poly1305_ctx *aadpoly, poly1305_ctx *ctpoly, \ | |
121 | const void *n, size_t nsz) \ | |
122 | { \ | |
123 | poly1305_key pk; \ | |
124 | octet b[POLY1305_KEYSZ + POLY1305_MASKSZ]; \ | |
125 | \ | |
126 | switch (nsz) { \ | |
127 | case SALSA20_NONCESZ: \ | |
128 | memcpy(ctx->s.a, ctx->k, sizeof(ctx->k)); \ | |
129 | base##_setnonce(&ctx->s, n); \ | |
130 | break; \ | |
131 | case SALSA20_IETF_NONCESZ: \ | |
132 | memcpy(ctx->s.a, ctx->k, sizeof(ctx->k)); \ | |
133 | base##_setnonce_ietf(&ctx->s, n); \ | |
134 | break; \ | |
135 | case XSALSA20_NONCESZ: \ | |
136 | x##latin##_setnonce(ctx, n); \ | |
137 | break; \ | |
138 | default: \ | |
139 | return (-1); \ | |
140 | } \ | |
141 | \ | |
142 | latin##_encrypt(&ctx->s, 0, b, sizeof(b)); \ | |
143 | poly1305_keyinit(&pk, b, POLY1305_KEYSZ); \ | |
144 | poly1305_macinit(aadpoly, &pk, b + POLY1305_KEYSZ); \ | |
145 | poly1305_macinit(ctpoly, &pk, b + POLY1305_KEYSZ); \ | |
146 | latin##_encrypt(&ctx->s, 0, 0, SALSA20_OUTSZ - sizeof(b)); \ | |
147 | return (0); \ | |
148 | } \ | |
149 | \ | |
150 | /* AAD operations. */ \ | |
151 | \ | |
152 | static const gaead_aadops gaops_##latin = \ | |
153 | { &latin##_poly1305, 0, latinpoly_aadhash, latinpoly_aaddestroy }; \ | |
154 | \ | |
155 | /* Encryption operations. */ \ | |
156 | \ | |
157 | typedef struct gectx_##latin { \ | |
158 | gaead_enc e; \ | |
159 | latinpoly_aad aad; \ | |
160 | x##latin##_ctx ctx; \ | |
161 | poly1305_ctx poly; \ | |
162 | } gectx_##latin; \ | |
163 | \ | |
164 | static gaead_aad *geaad_##latin(gaead_enc *e) \ | |
165 | { gectx_##latin *enc = (gectx_##latin *)e; return (&enc->aad.a); } \ | |
166 | \ | |
167 | static int gereinit_##latin(gaead_enc *e, const void *n, size_t nsz, \ | |
168 | size_t hsz, size_t msz, size_t tsz) \ | |
169 | { \ | |
170 | gectx_##latin *enc = (gectx_##latin *)e; \ | |
171 | return (reinit_##latin(&enc->ctx, &enc->aad.poly, &enc->poly, n, nsz)); \ | |
172 | } \ | |
173 | \ | |
174 | static int geenc_##latin(gaead_enc *e, \ | |
175 | const void *m, size_t msz, buf *b) \ | |
176 | { \ | |
177 | gectx_##latin *enc = (gectx_##latin *)e; \ | |
178 | void *q; \ | |
179 | \ | |
180 | if (msz) { q = buf_get(b, msz); if (!q) return (-1); } \ | |
181 | else q = 0; \ | |
182 | latin##_encrypt(&enc->ctx.s, m, q, msz); \ | |
183 | poly1305_hash(&enc->poly, q, msz); \ | |
184 | return (0); \ | |
185 | } \ | |
186 | \ | |
187 | static int gedone_##latin(gaead_enc *e, const gaead_aad *a, \ | |
188 | buf *b, void *t, size_t tsz) \ | |
189 | { \ | |
190 | gectx_##latin *enc = (gectx_##latin *)e; \ | |
191 | const latinpoly_aad *aad = (const latinpoly_aad *)a; \ | |
192 | \ | |
193 | if (tsz != POLY1305_TAGSZ) return (-1); \ | |
194 | assert((!enc->aad.poly.count && !enc->aad.poly.nbuf && !a) || \ | |
195 | a == &enc->aad.a); \ | |
196 | if (!BOK(b)) return (-1); \ | |
197 | latinpoly_tag(aad ? &aad->poly : 0, &enc->poly, t); \ | |
198 | return (0); \ | |
199 | } \ | |
200 | \ | |
201 | static void gedestroy_##latin(gaead_enc *e) \ | |
202 | { gectx_##latin *enc = (gectx_##latin *)e; BURN(*enc); S_DESTROY(enc); } \ | |
203 | \ | |
204 | static gaead_encops geops_##latin = \ | |
205 | { &latin##_poly1305, geaad_##latin, gereinit_##latin, \ | |
206 | geenc_##latin, gedone_##latin, gedestroy_##latin }; \ | |
207 | \ | |
208 | /* Decryption operations. */ \ | |
209 | \ | |
210 | typedef struct gdctx_##latin { \ | |
211 | gaead_dec d; \ | |
212 | latinpoly_aad aad; \ | |
213 | x##latin##_ctx ctx; \ | |
214 | poly1305_ctx poly; \ | |
215 | } gdctx_##latin; \ | |
216 | \ | |
217 | static gaead_aad *gdaad_##latin(gaead_dec *d) \ | |
218 | { gdctx_##latin *dec = (gdctx_##latin *)d; return (&dec->aad.a); } \ | |
219 | \ | |
220 | static int gdreinit_##latin(gaead_dec *d, const void *n, size_t nsz, \ | |
221 | size_t hsz, size_t msz, size_t tsz) \ | |
222 | { \ | |
223 | gdctx_##latin *dec = (gdctx_##latin *)d; \ | |
224 | return (reinit_##latin(&dec->ctx, &dec->aad.poly, &dec->poly, n, nsz)); \ | |
225 | } \ | |
226 | \ | |
227 | static int gddec_##latin(gaead_dec *d, \ | |
228 | const void *c, size_t csz, buf *b) \ | |
229 | { \ | |
230 | gdctx_##latin *dec = (gdctx_##latin *)d; \ | |
231 | void *q; \ | |
232 | \ | |
233 | if (csz) { q = buf_get(b, csz); if (!q) return (-1); } \ | |
234 | else q = 0; \ | |
235 | poly1305_hash(&dec->poly, c, csz); \ | |
236 | latin##_encrypt(&dec->ctx.s, c, q, csz); \ | |
237 | return (0); \ | |
238 | } \ | |
239 | \ | |
240 | static int gddone_##latin(gaead_dec *d, const gaead_aad *a, \ | |
241 | buf *b, const void *t, size_t tsz) \ | |
242 | { \ | |
243 | gdctx_##latin *dec = (gdctx_##latin *)d; \ | |
244 | const latinpoly_aad *aad = (const latinpoly_aad *)a; \ | |
245 | octet u[POLY1305_TAGSZ]; \ | |
246 | \ | |
247 | if (tsz != POLY1305_TAGSZ) return (-1); \ | |
248 | assert((!dec->aad.poly.count && !dec->aad.poly.nbuf && !a) || \ | |
249 | a == &dec->aad.a); \ | |
250 | if (!BOK(b)) return (-1); \ | |
251 | latinpoly_tag(aad ? &aad->poly : 0, &dec->poly, u); \ | |
252 | if (ct_memeq(t, u, POLY1305_TAGSZ)) return (+1); \ | |
253 | else return (0); \ | |
254 | } \ | |
255 | \ | |
256 | static void gddestroy_##latin(gaead_dec *d) \ | |
257 | { gdctx_##latin *dec = (gdctx_##latin *)d; BURN(*dec); S_DESTROY(dec); } \ | |
258 | \ | |
259 | static gaead_decops gdops_##latin = \ | |
260 | { &latin##_poly1305, gdaad_##latin, gdreinit_##latin, \ | |
261 | gddec_##latin, gddone_##latin, gddestroy_##latin }; \ | |
262 | \ | |
263 | /* Key operations. */ \ | |
264 | \ | |
265 | static gaead_enc *gkenc_##latin(const gaead_key *k, \ | |
266 | const void *n, size_t nsz, \ | |
267 | size_t hsz, size_t msz, size_t tsz) \ | |
268 | { \ | |
269 | latinpoly_key *key = (latinpoly_key *)k; \ | |
270 | gectx_##latin *enc = S_CREATE(gectx_##latin); \ | |
271 | \ | |
272 | enc->e.ops = &geops_##latin; enc->aad.a.ops = &gaops_##latin; \ | |
273 | x##latin##_init(&enc->ctx, key->key, key->ksz, 0); \ | |
274 | reinit_##latin(&enc->ctx, &enc->aad.poly, &enc->poly, n, nsz); \ | |
275 | return (&enc->e); \ | |
276 | } \ | |
277 | \ | |
278 | static gaead_dec *gkdec_##latin(const gaead_key *k, \ | |
279 | const void *n, size_t nsz, \ | |
280 | size_t hsz, size_t msz, size_t tsz) \ | |
281 | { \ | |
282 | latinpoly_key *key = (latinpoly_key *)k; \ | |
283 | gdctx_##latin *dec = S_CREATE(gdctx_##latin); \ | |
284 | \ | |
285 | dec->d.ops = &gdops_##latin; dec->aad.a.ops = &gaops_##latin; \ | |
286 | x##latin##_init(&dec->ctx, key->key, key->ksz, 0); \ | |
287 | reinit_##latin(&dec->ctx, &dec->aad.poly, &dec->poly, n, nsz); \ | |
288 | return (&dec->d); \ | |
289 | } \ | |
290 | \ | |
291 | static void gkdestroy_##latin(gaead_key *k) \ | |
292 | { latinpoly_key *key = (latinpoly_key *)k; BURN(*key); S_DESTROY(key); } \ | |
293 | \ | |
294 | static const gaead_keyops gkops_##latin = \ | |
295 | { &latin##_poly1305, 0, gkenc_##latin, gkdec_##latin, \ | |
296 | gkdestroy_##latin }; \ | |
297 | \ | |
298 | /* Class definition. */ \ | |
299 | \ | |
300 | static gaead_key *gkey_##latin(const void *k, size_t ksz) \ | |
301 | { \ | |
302 | latinpoly_key *key = S_CREATE(latinpoly_key); \ | |
303 | \ | |
304 | key->k.ops = &gkops_##latin; \ | |
305 | KSZ_ASSERT(latin, ksz); memcpy(key->key, k, ksz); key->ksz = ksz; \ | |
306 | return (&key->k); \ | |
307 | } \ | |
308 | \ | |
309 | const gcaead latin##_poly1305 = { \ | |
310 | name "-poly1305", latin##_keysz, latinpoly_noncesz, latinpoly_tagsz, \ | |
311 | 64, 0, 0, AEADF_AADNDEP, \ | |
312 | gkey_##latin \ | |
313 | }; | |
314 | ||
315 | /*----- That's all, folks -------------------------------------------------*/ | |
316 | ||
317 | #ifdef __cplusplus | |
318 | } | |
319 | #endif | |
320 | ||
321 | #endif |