| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * The OCB1 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_OCB1_DEF_H |
| 29 | #define CATACOMB_OCB1_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 | /*----- Macros ------------------------------------------------------------*/ |
| 63 | |
| 64 | /* --- @OCB1_DEF@ --- * |
| 65 | * |
| 66 | * Arguments: @PRE@, @pre@ = prefixes for the underlying block cipher |
| 67 | * |
| 68 | * Use: Creates an implementation for the OCB1 authenticated- |
| 69 | * encryption mode. |
| 70 | */ |
| 71 | |
| 72 | #define OCB1_DEF(PRE, pre) OCB1_DEFX(PRE, pre, #pre, #pre) |
| 73 | |
| 74 | #define OCB1_DEFX(PRE, pre, name, fname) \ |
| 75 | \ |
| 76 | const octet \ |
| 77 | pre##_ocb1noncesz[] = { KSZ_SET, PRE##_BLKSZ, 0 }, \ |
| 78 | pre##_ocb1tagsz[] = { KSZ_RANGE, PRE##_BLKSZ, 0, PRE##_BLKSZ, 1 }; \ |
| 79 | \ |
| 80 | /* --- @pre_ocb1init@ --- * \ |
| 81 | * \ |
| 82 | * Arguments: @pre_ocb1ctx *ctx@ = pointer to OCB1 context \ |
| 83 | * @const pre_ocb1key *key@ = pointer to key block \ |
| 84 | * @const void *n@ = pointer to nonce \ |
| 85 | * @size_t nsz@ = size of nonce \ |
| 86 | * \ |
| 87 | * Returns: Zero on success, @-1@ if the nonce length is bad. \ |
| 88 | * \ |
| 89 | * Use: Initialize an OCB1 operation context with a given key. \ |
| 90 | * \ |
| 91 | * The original key needn't be kept around any more. \ |
| 92 | */ \ |
| 93 | \ |
| 94 | int pre##_ocb1init(pre##_ocb1ctx *ctx, const pre##_ocb1key *k, \ |
| 95 | const void *n, size_t nsz) \ |
| 96 | { ctx->k = *k; return (pre##_ocb1reinit(ctx, n, nsz)); } \ |
| 97 | \ |
| 98 | /* --- @pre_ocb1reinit@ --- * \ |
| 99 | * \ |
| 100 | * Arguments: @pre_ocb1ctx *ctx@ = pointer to OCB1 context \ |
| 101 | * @const void *n@ = pointer to nonce \ |
| 102 | * @size_t nsz@ = size of nonce \ |
| 103 | * \ |
| 104 | * Returns: Zero on success, @-1@ if the nonce length is bad. \ |
| 105 | * \ |
| 106 | * Use: Reinitialize an OCB1 operation context, changing the \ |
| 107 | * nonce. \ |
| 108 | */ \ |
| 109 | \ |
| 110 | int pre##_ocb1reinit(pre##_ocb1ctx *ctx, const void *n, size_t nsz) \ |
| 111 | { \ |
| 112 | if (nsz != PRE##_BLKSZ) return (-1); \ |
| 113 | ctx->off = 0; BLKC_ZERO(PRE, ctx->a); \ |
| 114 | BLKC_LOAD(PRE, ctx->o, n); BLKC_XMOVE(PRE, ctx->o, ctx->k.lmask[0]); \ |
| 115 | pre##_eblk(&ctx->k.ctx, ctx->o, ctx->o); ctx->i = 1; \ |
| 116 | return (0); \ |
| 117 | } \ |
| 118 | \ |
| 119 | /* --- @pre_ocb1encrypt@ --- * \ |
| 120 | * \ |
| 121 | * Arguments: @pre_ocb1ctx *ctx@ = pointer to OCB1 operation context \ |
| 122 | * @const void *src@ = pointer to plaintext message chunk \ |
| 123 | * @size_t sz@ = size of the plaintext \ |
| 124 | * @buf *dst@ = a buffer to write the ciphertext to \ |
| 125 | * \ |
| 126 | * Returns: Zero on success; @-1@ on failure. \ |
| 127 | * \ |
| 128 | * Use: Encrypts a chunk of a plaintext message, writing a \ |
| 129 | * chunk of ciphertext to the output buffer and updating \ |
| 130 | * the operation state. \ |
| 131 | * \ |
| 132 | * Note that OCB1 delays output if its input is not a \ |
| 133 | * whole number of blocks. This means that the output \ |
| 134 | * might be smaller or larger the input by up to the block \ |
| 135 | * size. \ |
| 136 | */ \ |
| 137 | \ |
| 138 | int pre##_ocb1encrypt(pre##_ocb1ctx *ctx, \ |
| 139 | const void *src, size_t sz, buf *dst) \ |
| 140 | { \ |
| 141 | rsvr_state st; \ |
| 142 | size_t osz; \ |
| 143 | uint32 t[PRE##_BLKSZ/4]; \ |
| 144 | const octet *p; \ |
| 145 | octet *q; \ |
| 146 | \ |
| 147 | /* Figure out what we're going to do. */ \ |
| 148 | rsvr_setup(&st, &pre##_ocb1policy, ctx->b, &ctx->off, src, sz); \ |
| 149 | \ |
| 150 | /* Determine the output size and verify that there is enough \ |
| 151 | * space. \ |
| 152 | */ \ |
| 153 | osz = st.plan.from_rsvr + st.plan.from_input; \ |
| 154 | if (!osz) q = 0; \ |
| 155 | else { q = buf_get(dst, osz); if (!q) return (-1); } \ |
| 156 | \ |
| 157 | /* Process the input in whole blocks at a time. */ \ |
| 158 | RSVR_DO(&st) while ((p = RSVR_NEXT(&st, PRE##_BLKSZ)) != 0) { \ |
| 159 | OCB_OFFSET(PRE, ctx->o, ctx->k.lmask, ctx->i++); \ |
| 160 | BLKC_LOAD(PRE, t, p); BLKC_XMOVE(PRE, ctx->a, t); \ |
| 161 | BLKC_XMOVE(PRE, t, ctx->o); pre##_eblk(&ctx->k.ctx, t, t); \ |
| 162 | BLKC_XSTORE(PRE, q, t, ctx->o); q += PRE##_BLKSZ; \ |
| 163 | } \ |
| 164 | \ |
| 165 | /* Done. */ \ |
| 166 | return (0); \ |
| 167 | } \ |
| 168 | \ |
| 169 | /* --- @pre_ocb1decrypt@ --- * \ |
| 170 | * \ |
| 171 | * Arguments: @pre_ocb1ctx *ctx@ = pointer to OCB1 operation context \ |
| 172 | * @const void *src@ = pointer to ciphertext message chunk \ |
| 173 | * @size_t sz@ = size of the ciphertext \ |
| 174 | * @buf *dst@ = a buffer to write the plaintext to \ |
| 175 | * \ |
| 176 | * Returns: Zero on success; @-1@ on failure. \ |
| 177 | * \ |
| 178 | * Use: Decrypts a chunk of a ciphertext message, writing a \ |
| 179 | * chunk of plaintext to the output buffer and updating \ |
| 180 | * the operation state. \ |
| 181 | * \ |
| 182 | * Note that OCB1 delays output if its input is not a \ |
| 183 | * whole number of blocks. This means that the output \ |
| 184 | * might be smaller or larger the input by up to the block \ |
| 185 | * size. \ |
| 186 | */ \ |
| 187 | \ |
| 188 | int pre##_ocb1decrypt(pre##_ocb1ctx *ctx, \ |
| 189 | const void *src, size_t sz, buf *dst) \ |
| 190 | { \ |
| 191 | rsvr_state st; \ |
| 192 | size_t osz; \ |
| 193 | uint32 t[PRE##_BLKSZ/4]; \ |
| 194 | const octet *p; \ |
| 195 | octet *q; \ |
| 196 | \ |
| 197 | /* Figure out what we're going to do. */ \ |
| 198 | rsvr_setup(&st, &pre##_ocb1policy, ctx->b, &ctx->off, src, sz); \ |
| 199 | \ |
| 200 | /* Determine the output size and verify that there is enough \ |
| 201 | * space. \ |
| 202 | */ \ |
| 203 | osz = st.plan.from_rsvr + st.plan.from_input; \ |
| 204 | if (!osz) q = 0; \ |
| 205 | else { q = buf_get(dst, osz); if (!q) return (-1); } \ |
| 206 | \ |
| 207 | /* Process the input in whole blocks at a time. */ \ |
| 208 | RSVR_DO(&st) while ((p = RSVR_NEXT(&st, PRE##_BLKSZ)) != 0) { \ |
| 209 | OCB_OFFSET(PRE, ctx->o, ctx->k.lmask, ctx->i++); \ |
| 210 | BLKC_LOAD(PRE, t, p); \ |
| 211 | BLKC_XMOVE(PRE, t, ctx->o); pre##_dblk(&ctx->k.ctx, t, t); \ |
| 212 | BLKC_XMOVE(PRE, t, ctx->o); BLKC_XMOVE(PRE, ctx->a, t); \ |
| 213 | BLKC_STORE(PRE, q, t); q += PRE##_BLKSZ; \ |
| 214 | } \ |
| 215 | \ |
| 216 | /* Done. */ \ |
| 217 | return (0); \ |
| 218 | } \ |
| 219 | \ |
| 220 | /* --- @pre_ocb1encdecfinal@ --- * \ |
| 221 | * \ |
| 222 | * Arguments: @pre_ocb1ctx *ctx@ = pointer to an OCB1 context \ |
| 223 | * @const pre_ocb1aadctx *aad@ = pointer to AAD context, \ |
| 224 | * or null \ |
| 225 | * @buf *dst@ = buffer for remaining ciphertext \ |
| 226 | * @int encp@ = nonzero if we're encrypting \ |
| 227 | * \ |
| 228 | * Returns: Zero on success; @-1@ on failure. \ |
| 229 | * \ |
| 230 | * Use: Common end-of-message handling for encryption and \ |
| 231 | * decryption. The full-length tag is left in the \ |
| 232 | * context's buffer. \ |
| 233 | */ \ |
| 234 | \ |
| 235 | static int pre##_ocb1encdecfinal(pre##_ocb1ctx *ctx, \ |
| 236 | const pre##_ocb1aadctx *aad, buf *dst, \ |
| 237 | int encp) \ |
| 238 | { \ |
| 239 | octet *q; \ |
| 240 | \ |
| 241 | /* Arrange space for the final output (if any). */ \ |
| 242 | if (!ctx->off) { q = 0; if (!BOK(dst)) return (-1); } \ |
| 243 | else { q = buf_get(dst, ctx->off); if (!q) return (-1); } \ |
| 244 | \ |
| 245 | /* Calculate the final offset. Mix it into the checksum before it \ |
| 246 | * gets clobbered. \ |
| 247 | */ \ |
| 248 | OCB_OFFSET(PRE, ctx->o, ctx->k.lmask, ctx->i++); \ |
| 249 | BLKC_XMOVE(PRE, ctx->a, ctx->o); \ |
| 250 | \ |
| 251 | /* Mix the magic final mask and tail length into the offset. */ \ |
| 252 | BLKC_XMOVE(PRE, ctx->o, ctx->k.lxinv); \ |
| 253 | ctx->o[PRE##_BLKSZ/4 - 1] ^= BLKC_BWORD(PRE, 8*ctx->off); \ |
| 254 | \ |
| 255 | /* If we're decrypting, then trim the end of the plaintext and fold \ |
| 256 | * that into the checksum. \ |
| 257 | */ \ |
| 258 | if (!encp) { \ |
| 259 | memset(ctx->b + ctx->off, 0, PRE##_BLKSZ - ctx->off); \ |
| 260 | BLKC_XLOAD(PRE, ctx->a, ctx->b); \ |
| 261 | } \ |
| 262 | \ |
| 263 | /* Cycle the block cipher for the last plaintext block. */ \ |
| 264 | pre##_eblk(&ctx->k.ctx, ctx->o, ctx->o); \ |
| 265 | \ |
| 266 | /* Fold this mask into the checksum before it gets clobbered. */ \ |
| 267 | BLKC_XMOVE(PRE, ctx->a, ctx->o); \ |
| 268 | \ |
| 269 | /* Encrypt the message tail. */ \ |
| 270 | BLKC_XLOAD(PRE, ctx->o, ctx->b); \ |
| 271 | BLKC_STORE(PRE, ctx->b, ctx->o); \ |
| 272 | if (ctx->off) memcpy(q, ctx->b, ctx->off); \ |
| 273 | \ |
| 274 | /* If we're encrypting, then trim the end of the ciphertext and fold \ |
| 275 | * that into the checksum. \ |
| 276 | */ \ |
| 277 | if (encp) { \ |
| 278 | memset(ctx->b + ctx->off, 0, PRE##_BLKSZ - ctx->off); \ |
| 279 | BLKC_XLOAD(PRE, ctx->a, ctx->b); \ |
| 280 | } \ |
| 281 | \ |
| 282 | /* Encrypt the checksum to produce a tag. */ \ |
| 283 | pre##_eblk(&ctx->k.ctx, ctx->a, ctx->a); \ |
| 284 | \ |
| 285 | /* If there's AAD then mix the PMAC tag in too. */ \ |
| 286 | if (aad && aad->off) \ |
| 287 | { pre##_ocb1aadtag(aad, ctx->o); BLKC_XMOVE(PRE, ctx->a, ctx->o); } \ |
| 288 | \ |
| 289 | /* Write the final tag. */ \ |
| 290 | BLKC_STORE(PRE, ctx->b, ctx->a); \ |
| 291 | \ |
| 292 | /* Done. */ \ |
| 293 | return (0); \ |
| 294 | } \ |
| 295 | \ |
| 296 | /* --- @pre_ocb1encryptdone@ --- * \ |
| 297 | * \ |
| 298 | * Arguments: @pre_ocb1ctx *ctx@ = pointer to an OCB1 context \ |
| 299 | * @const pre_ocb1aadctx *aad@ = pointer to AAD context, \ |
| 300 | * or null \ |
| 301 | * @buf *dst@ = buffer for remaining ciphertext \ |
| 302 | * @void *tag@ = where to write the tag \ |
| 303 | * @size_t tsz@ = length of tag to store \ |
| 304 | * \ |
| 305 | * Returns: Zero on success; @-1@ on failure. \ |
| 306 | * \ |
| 307 | * Use: Completes an OCB1 encryption operation. The @aad@ \ |
| 308 | * pointer may be null if there is no additional \ |
| 309 | * authenticated data. OCB1 delays output, so this will \ |
| 310 | * cause any remaining buffered plaintext to be encrypted \ |
| 311 | * and written to @dst@. Anyway, the function will fail \ |
| 312 | * if the output buffer is broken. \ |
| 313 | */ \ |
| 314 | \ |
| 315 | int pre##_ocb1encryptdone(pre##_ocb1ctx *ctx, \ |
| 316 | const pre##_ocb1aadctx *aad, buf *dst, \ |
| 317 | void *tag, size_t tsz) \ |
| 318 | { \ |
| 319 | assert(tsz <= PRE##_BLKSZ); \ |
| 320 | if (pre##_ocb1encdecfinal(ctx, aad, dst, 1)) return (-1); \ |
| 321 | memcpy(tag, ctx->b, tsz); \ |
| 322 | return (0); \ |
| 323 | } \ |
| 324 | \ |
| 325 | /* --- @pre_ocb1decryptdone@ --- * \ |
| 326 | * \ |
| 327 | * Arguments: @pre_ocb1ctx *ctx@ = pointer to an OCB1 context \ |
| 328 | * @const pre_ocb1aadctx *aad@ = pointer to AAD context, \ |
| 329 | * or null \ |
| 330 | * @buf *dst@ = buffer for remaining plaintext \ |
| 331 | * @const void *tag@ = tag to verify \ |
| 332 | * @size_t tsz@ = length of tag \ |
| 333 | * \ |
| 334 | * Returns: @+1@ for complete success; @0@ if tag verification \ |
| 335 | * failed; @-1@ for other kinds of errors. \ |
| 336 | * \ |
| 337 | * Use: Completes an OCB1 decryption operation. The @aad@ \ |
| 338 | * pointer may be null if there is no additional \ |
| 339 | * authenticated data. OCB1 delays output, so this will \ |
| 340 | * cause any remaining buffered ciphertext to be decrypted \ |
| 341 | * and written to @dst@. Anyway, the function will fail \ |
| 342 | * if the output buffer is broken. \ |
| 343 | */ \ |
| 344 | \ |
| 345 | int pre##_ocb1decryptdone(pre##_ocb1ctx *ctx, \ |
| 346 | const pre##_ocb1aadctx *aad, buf *dst, \ |
| 347 | const void *tag, size_t tsz) \ |
| 348 | { \ |
| 349 | assert(tsz <= PRE##_BLKSZ); \ |
| 350 | if (pre##_ocb1encdecfinal(ctx, aad, dst, 0)) return (-1); \ |
| 351 | else if (ct_memeq(tag, ctx->b, tsz)) return (+1); \ |
| 352 | else return (0); \ |
| 353 | } \ |
| 354 | \ |
| 355 | /* --- Generic AEAD interface --- */ \ |
| 356 | \ |
| 357 | typedef struct gactx { \ |
| 358 | gaead_aad a; \ |
| 359 | pre##_ocb1aadctx aad; \ |
| 360 | } gactx; \ |
| 361 | \ |
| 362 | static gaead_aad *gadup(const gaead_aad *a) \ |
| 363 | { gactx *aad = S_CREATE(gactx); *aad = *(gactx *)a; return (&aad->a); } \ |
| 364 | \ |
| 365 | static void gahash(gaead_aad *a, const void *h, size_t hsz) \ |
| 366 | { gactx *aad = (gactx *)a; pre##_ocb1aadhash(&aad->aad, h, hsz); } \ |
| 367 | \ |
| 368 | static void gadestroy(gaead_aad *a) \ |
| 369 | { gactx *aad = (gactx *)a; BURN(*aad); S_DESTROY(aad); } \ |
| 370 | \ |
| 371 | static const gaead_aadops gaops = \ |
| 372 | { &pre##_ocb1, gadup, gahash, gadestroy }; \ |
| 373 | \ |
| 374 | static gaead_aad *gaad(const pre##_ocb1key *k) \ |
| 375 | { \ |
| 376 | gactx *aad = S_CREATE(gactx); \ |
| 377 | aad->a.ops = &gaops; \ |
| 378 | pre##_ocb1aadinit(&aad->aad, k); \ |
| 379 | return (&aad->a); \ |
| 380 | } \ |
| 381 | \ |
| 382 | typedef struct gectx { \ |
| 383 | gaead_enc e; \ |
| 384 | pre##_ocb1ctx ctx; \ |
| 385 | } gectx; \ |
| 386 | \ |
| 387 | static gaead_aad *geaad(gaead_enc *e) \ |
| 388 | { gectx *enc = (gectx *)e; return (gaad(&enc->ctx.k)); } \ |
| 389 | \ |
| 390 | static int gereinit(gaead_enc *e, const void *n, size_t nsz, \ |
| 391 | size_t hsz, size_t msz, size_t tsz) \ |
| 392 | { \ |
| 393 | gectx *enc = (gectx *)e; \ |
| 394 | return (pre##_ocb1reinit(&enc->ctx, n, nsz)); \ |
| 395 | } \ |
| 396 | \ |
| 397 | static int geenc(gaead_enc *e, const void *m, size_t msz, buf *b) \ |
| 398 | { \ |
| 399 | gectx *enc = (gectx *)e; \ |
| 400 | return (pre##_ocb1encrypt(&enc->ctx, m, msz, b)); \ |
| 401 | } \ |
| 402 | \ |
| 403 | static int gedone(gaead_enc *e, const gaead_aad *a, \ |
| 404 | buf *b, void *t, size_t tsz) \ |
| 405 | { \ |
| 406 | gectx *enc = (gectx *)e; gactx *aad = (gactx *)a; \ |
| 407 | assert(!a || a->ops == &gaops); \ |
| 408 | return (pre##_ocb1encryptdone(&enc->ctx, a ? &aad->aad : 0, b, t, tsz)); \ |
| 409 | } \ |
| 410 | \ |
| 411 | static void gedestroy(gaead_enc *e) \ |
| 412 | { gectx *enc = (gectx *)e; BURN(*enc); S_DESTROY(enc); } \ |
| 413 | \ |
| 414 | static const gaead_encops geops = \ |
| 415 | { &pre##_ocb1, geaad, gereinit, geenc, gedone, gedestroy }; \ |
| 416 | \ |
| 417 | typedef struct gdctx { \ |
| 418 | gaead_dec d; \ |
| 419 | pre##_ocb1ctx ctx; \ |
| 420 | } gdctx; \ |
| 421 | \ |
| 422 | static gaead_aad *gdaad(gaead_dec *d) \ |
| 423 | { gdctx *dec = (gdctx *)d; return (gaad(&dec->ctx.k)); } \ |
| 424 | \ |
| 425 | static int gdreinit(gaead_dec *d, const void *n, size_t nsz, \ |
| 426 | size_t hsz, size_t csz, size_t tsz) \ |
| 427 | { \ |
| 428 | gdctx *dec = (gdctx *)d; \ |
| 429 | return (pre##_ocb1reinit(&dec->ctx, n, nsz)); \ |
| 430 | } \ |
| 431 | \ |
| 432 | static int gddec(gaead_dec *d, const void *c, size_t csz, buf *b) \ |
| 433 | { \ |
| 434 | gdctx *dec = (gdctx *)d; \ |
| 435 | return (pre##_ocb1decrypt(&dec->ctx, c, csz, b)); \ |
| 436 | } \ |
| 437 | \ |
| 438 | static int gddone(gaead_dec *d, const gaead_aad *a, \ |
| 439 | buf *b, const void *t, size_t tsz) \ |
| 440 | { \ |
| 441 | gdctx *dec = (gdctx *)d; gactx *aad = (gactx *)a; \ |
| 442 | assert(!a || a->ops == &gaops); \ |
| 443 | return (pre##_ocb1decryptdone(&dec->ctx, a ? &aad->aad : 0, b, t, tsz)); \ |
| 444 | } \ |
| 445 | \ |
| 446 | static void gddestroy(gaead_dec *d) \ |
| 447 | { gdctx *dec = (gdctx *)d; BURN(*dec); S_DESTROY(dec); } \ |
| 448 | \ |
| 449 | static const gaead_decops gdops = \ |
| 450 | { &pre##_ocb1, gdaad, gdreinit, gddec, gddone, gddestroy }; \ |
| 451 | \ |
| 452 | typedef struct gkctx { \ |
| 453 | gaead_key k; \ |
| 454 | pre##_ocb1key key; \ |
| 455 | } gkctx; \ |
| 456 | \ |
| 457 | static gaead_aad *gkaad(const gaead_key *k) \ |
| 458 | { gkctx *key = (gkctx *)k; return (gaad(&key->key)); } \ |
| 459 | \ |
| 460 | static gaead_enc *gkenc(const gaead_key *k, const void *n, size_t nsz, \ |
| 461 | size_t hsz, size_t msz, size_t tsz) \ |
| 462 | { \ |
| 463 | gkctx *key = (gkctx *)k; \ |
| 464 | gectx *enc = S_CREATE(gectx); \ |
| 465 | \ |
| 466 | enc->e.ops = &geops; \ |
| 467 | if (pre##_ocb1init(&enc->ctx, &key->key, n, nsz)) \ |
| 468 | { gedestroy(&enc->e); return (0); } \ |
| 469 | return (&enc->e); \ |
| 470 | } \ |
| 471 | \ |
| 472 | static gaead_dec *gkdec(const gaead_key *k, const void *n, size_t nsz, \ |
| 473 | size_t hsz, size_t csz, size_t tsz) \ |
| 474 | { \ |
| 475 | gkctx *key = (gkctx *)k; \ |
| 476 | gdctx *dec = S_CREATE(gdctx); \ |
| 477 | \ |
| 478 | dec->d.ops = &gdops; \ |
| 479 | if (pre##_ocb1init(&dec->ctx, &key->key, n, nsz)) \ |
| 480 | { gddestroy(&dec->d); return (0); } \ |
| 481 | return (&dec->d); \ |
| 482 | } \ |
| 483 | \ |
| 484 | static void gkdestroy(gaead_key *k) \ |
| 485 | { gkctx *key = (gkctx *)k; BURN(*key); S_DESTROY(key); } \ |
| 486 | \ |
| 487 | static const gaead_keyops gkops = \ |
| 488 | { &pre##_ocb1, gkaad, gkenc, gkdec, gkdestroy }; \ |
| 489 | \ |
| 490 | static gaead_key *gckey(const void *k, size_t ksz) \ |
| 491 | { \ |
| 492 | gkctx *key = S_CREATE(gkctx); \ |
| 493 | key->k.ops = &gkops; \ |
| 494 | pre##_ocb1setkey(&key->key, k, ksz); \ |
| 495 | return (&key->k); \ |
| 496 | } \ |
| 497 | \ |
| 498 | const gcaead pre##_ocb1 = { \ |
| 499 | name "-ocb1", \ |
| 500 | pre##_keysz, pre##_ocb1noncesz, pre##_ocb1tagsz, \ |
| 501 | PRE##_BLKSZ, PRE##_BLKSZ, 0, 0, \ |
| 502 | gckey \ |
| 503 | }; \ |
| 504 | \ |
| 505 | OCB1_TESTX(PRE, pre, name, fname) |
| 506 | |
| 507 | /*----- Test rig ----------------------------------------------------------*/ |
| 508 | |
| 509 | #define OCB1_TEST(PRE, pre) OCB1_TESTX(PRE, pre, #pre, #pre) |
| 510 | |
| 511 | /* --- @OCB1_TEST@ --- * |
| 512 | * |
| 513 | * Arguments: @PRE, pre@ = prefixes for the underlying block cipher |
| 514 | * |
| 515 | * Use: Standard test rig for OCB1 functions. |
| 516 | */ |
| 517 | |
| 518 | #ifdef TEST_RIG |
| 519 | |
| 520 | #include <stdio.h> |
| 521 | |
| 522 | #include <mLib/dstr.h> |
| 523 | #include <mLib/macros.h> |
| 524 | #include <mLib/quis.h> |
| 525 | #include <mLib/testrig.h> |
| 526 | |
| 527 | #define OCB1_TESTX(PRE, pre, name, fname) \ |
| 528 | \ |
| 529 | static int ocb1verify(dstr *v) \ |
| 530 | { \ |
| 531 | pre##_ocb1key key; \ |
| 532 | pre##_ocb1aadctx aad; \ |
| 533 | pre##_ocb1ctx ctx; \ |
| 534 | int ok = 1, win; \ |
| 535 | int i; \ |
| 536 | octet *p; \ |
| 537 | int szs[] = { 1, 7, 192, -1, 0 }, *ip; \ |
| 538 | size_t hsz, msz; \ |
| 539 | dstr d = DSTR_INIT, t = DSTR_INIT; \ |
| 540 | buf b; \ |
| 541 | \ |
| 542 | dstr_ensure(&d, v[4].len > v[3].len ? v[4].len : v[3].len); \ |
| 543 | dstr_ensure(&t, v[5].len); t.len = v[5].len; \ |
| 544 | \ |
| 545 | pre##_ocb1setkey(&key, v[0].buf, v[0].len); \ |
| 546 | \ |
| 547 | for (ip = szs; *ip; ip++) { \ |
| 548 | \ |
| 549 | pre##_ocb1init(&ctx, &key, (octet *)v[1].buf, v[1].len); \ |
| 550 | \ |
| 551 | i = *ip; \ |
| 552 | hsz = v[2].len; \ |
| 553 | if (i == -1) i = hsz; \ |
| 554 | if (i > hsz) continue; \ |
| 555 | p = (octet *)v[2].buf; \ |
| 556 | pre##_ocb1aadinit(&aad, &key); \ |
| 557 | while (hsz) { \ |
| 558 | if (i > hsz) i = hsz; \ |
| 559 | pre##_ocb1aadhash(&aad, p, i); \ |
| 560 | p += i; hsz -= i; \ |
| 561 | } \ |
| 562 | \ |
| 563 | buf_init(&b, d.buf, d.sz); \ |
| 564 | i = *ip; \ |
| 565 | msz = v[3].len; \ |
| 566 | if (i == -1) i = msz; \ |
| 567 | if (i > msz) continue; \ |
| 568 | p = (octet *)v[3].buf; \ |
| 569 | while (msz) { \ |
| 570 | if (i > msz) i = msz; \ |
| 571 | if (pre##_ocb1encrypt(&ctx, p, i, &b)) { \ |
| 572 | puts("!! ocb1encrypt reports failure"); \ |
| 573 | goto fail_enc; \ |
| 574 | } \ |
| 575 | p += i; msz -= i; \ |
| 576 | } \ |
| 577 | \ |
| 578 | if (pre##_ocb1encryptdone(&ctx, &aad, &b, (octet *)t.buf, t.len)) { \ |
| 579 | puts("!! ocb1encryptdone reports failure"); \ |
| 580 | goto fail_enc; \ |
| 581 | } \ |
| 582 | d.len = BLEN(&b); \ |
| 583 | \ |
| 584 | if (d.len != v[4].len || \ |
| 585 | MEMCMP(d.buf, !=, v[4].buf, v[4].len) || \ |
| 586 | MEMCMP(t.buf, !=, v[5].buf, v[5].len)) { \ |
| 587 | fail_enc: \ |
| 588 | printf("\nfail encrypt:\n\tstep = %i", *ip); \ |
| 589 | fputs("\n\tkey = ", stdout); type_hex.dump(&v[0], stdout); \ |
| 590 | fputs("\n\tnonce = ", stdout); type_hex.dump(&v[1], stdout); \ |
| 591 | fputs("\n\theader = ", stdout); type_hex.dump(&v[2], stdout); \ |
| 592 | fputs("\n\tmessage = ", stdout); type_hex.dump(&v[3], stdout); \ |
| 593 | fputs("\n\texp ct = ", stdout); type_hex.dump(&v[4], stdout); \ |
| 594 | fputs("\n\tcalc ct = ", stdout); type_hex.dump(&d, stdout); \ |
| 595 | fputs("\n\texp tag = ", stdout); type_hex.dump(&v[5], stdout); \ |
| 596 | fputs("\n\tcalc tag = ", stdout); type_hex.dump(&t, stdout); \ |
| 597 | putchar('\n'); \ |
| 598 | ok = 0; \ |
| 599 | } \ |
| 600 | \ |
| 601 | pre##_ocb1init(&ctx, &key, (octet *)v[1].buf, v[1].len); \ |
| 602 | \ |
| 603 | buf_init(&b, d.buf, d.sz); \ |
| 604 | i = *ip; \ |
| 605 | msz = v[4].len; \ |
| 606 | if (i == -1) i = msz; \ |
| 607 | if (i > msz) continue; \ |
| 608 | p = (octet *)v[4].buf; \ |
| 609 | while (msz) { \ |
| 610 | if (i > msz) i = msz; \ |
| 611 | if (pre##_ocb1decrypt(&ctx, p, i, &b)) { \ |
| 612 | puts("!! ocb1decrypt reports failure"); \ |
| 613 | win = 0; goto fail_dec; \ |
| 614 | } \ |
| 615 | p += i; msz -= i; \ |
| 616 | } \ |
| 617 | \ |
| 618 | win = pre##_ocb1decryptdone(&ctx, &aad, &b, \ |
| 619 | (octet *)v[5].buf, v[5].len); \ |
| 620 | if (win < 0) { \ |
| 621 | puts("!! ocb1decryptdone reports failure"); \ |
| 622 | goto fail_dec; \ |
| 623 | } \ |
| 624 | d.len = BLEN(&b); \ |
| 625 | \ |
| 626 | if (d.len != v[3].len || !win || \ |
| 627 | MEMCMP(d.buf, !=, v[3].buf, v[3].len)) { \ |
| 628 | fail_dec: \ |
| 629 | printf("\nfail decrypt:\n\tstep = %i", *ip); \ |
| 630 | fputs("\n\tkey = ", stdout); type_hex.dump(&v[0], stdout); \ |
| 631 | fputs("\n\tnonce = ", stdout); type_hex.dump(&v[1], stdout); \ |
| 632 | fputs("\n\theader = ", stdout); type_hex.dump(&v[2], stdout); \ |
| 633 | fputs("\n\tciphertext = ", stdout); type_hex.dump(&v[4], stdout); \ |
| 634 | fputs("\n\texp pt = ", stdout); type_hex.dump(&v[3], stdout); \ |
| 635 | fputs("\n\tcalc pt = ", stdout); type_hex.dump(&d, stdout); \ |
| 636 | fputs("\n\ttag = ", stdout); type_hex.dump(&v[5], stdout); \ |
| 637 | printf("\n\tverify %s", win ? "ok" : "FAILED"); \ |
| 638 | putchar('\n'); \ |
| 639 | ok = 0; \ |
| 640 | } \ |
| 641 | } \ |
| 642 | \ |
| 643 | dstr_destroy(&d); dstr_destroy(&t); \ |
| 644 | return (ok); \ |
| 645 | } \ |
| 646 | \ |
| 647 | static test_chunk aeaddefs[] = { \ |
| 648 | { name "-ocb1", ocb1verify, \ |
| 649 | { &type_hex, &type_hex, &type_hex, &type_hex, \ |
| 650 | &type_hex, &type_hex, 0 } }, \ |
| 651 | { 0, 0, { 0 } } \ |
| 652 | }; \ |
| 653 | \ |
| 654 | int main(int argc, char *argv[]) \ |
| 655 | { \ |
| 656 | ego(argv[0]); \ |
| 657 | test_run(argc, argv, aeaddefs, SRCDIR"/t/" fname); \ |
| 658 | return (0); \ |
| 659 | } |
| 660 | |
| 661 | #else |
| 662 | # define OCB1_TESTX(PRE, pre, name, fname) |
| 663 | #endif |
| 664 | |
| 665 | /*----- That's all, folks -------------------------------------------------*/ |
| 666 | |
| 667 | #ifdef __cplusplus |
| 668 | } |
| 669 | #endif |
| 670 | |
| 671 | #endif |