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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 #include "secder.h" | |
| 6 #include "secerr.h" | |
| 7 | |
| 8 #if 0 | |
| 9 /* | |
| 10 * Generic templates for individual/simple items. | |
| 11 */ | |
| 12 | |
| 13 DERTemplate SECAnyTemplate[] = { | |
| 14 { DER_ANY, | |
| 15 0, NULL, sizeof(SECItem) } | |
| 16 }; | |
| 17 | |
| 18 DERTemplate SECBitStringTemplate[] = { | |
| 19 { DER_BIT_STRING, | |
| 20 0, NULL, sizeof(SECItem) } | |
| 21 }; | |
| 22 | |
| 23 DERTemplate SECBooleanTemplate[] = { | |
| 24 { DER_BOOLEAN, | |
| 25 0, NULL, sizeof(SECItem) } | |
| 26 }; | |
| 27 | |
| 28 DERTemplate SECIA5StringTemplate[] = { | |
| 29 { DER_IA5_STRING, | |
| 30 0, NULL, sizeof(SECItem) } | |
| 31 }; | |
| 32 | |
| 33 DERTemplate SECIntegerTemplate[] = { | |
| 34 { DER_INTEGER, | |
| 35 0, NULL, sizeof(SECItem) } | |
| 36 }; | |
| 37 | |
| 38 DERTemplate SECNullTemplate[] = { | |
| 39 { DER_NULL, | |
| 40 0, NULL, sizeof(SECItem) } | |
| 41 }; | |
| 42 | |
| 43 DERTemplate SECObjectIDTemplate[] = { | |
| 44 { DER_OBJECT_ID, | |
| 45 0, NULL, sizeof(SECItem) } | |
| 46 }; | |
| 47 | |
| 48 DERTemplate SECOctetStringTemplate[] = { | |
| 49 { DER_OCTET_STRING, | |
| 50 0, NULL, sizeof(SECItem) } | |
| 51 }; | |
| 52 | |
| 53 DERTemplate SECPrintableStringTemplate[] = { | |
| 54 { DER_PRINTABLE_STRING, | |
| 55 0, NULL, sizeof(SECItem) } | |
| 56 }; | |
| 57 | |
| 58 DERTemplate SECT61StringTemplate[] = { | |
| 59 { DER_T61_STRING, | |
| 60 0, NULL, sizeof(SECItem) } | |
| 61 }; | |
| 62 | |
| 63 DERTemplate SECUTCTimeTemplate[] = { | |
| 64 { DER_UTC_TIME, | |
| 65 0, NULL, sizeof(SECItem) } | |
| 66 }; | |
| 67 | |
| 68 #endif | |
| 69 | |
| 70 static int | |
| 71 header_length(DERTemplate *dtemplate, PRUint32 contents_len) | |
| 72 { | |
| 73 PRUint32 len; | |
| 74 unsigned long encode_kind, under_kind; | |
| 75 PRBool explicit, optional, universal; | |
| 76 | |
| 77 encode_kind = dtemplate->kind; | |
| 78 | |
| 79 explicit = (encode_kind & DER_EXPLICIT) ? PR_TRUE : PR_FALSE; | |
| 80 optional = (encode_kind & DER_OPTIONAL) ? PR_TRUE : PR_FALSE; | |
| 81 universal = ((encode_kind & DER_CLASS_MASK) == DER_UNIVERSAL) | |
| 82 ? PR_TRUE : PR_FALSE; | |
| 83 | |
| 84 PORT_Assert (!(explicit && universal)); /* bad templates */ | |
| 85 | |
| 86 if (encode_kind & DER_POINTER) { | |
| 87 if (dtemplate->sub != NULL) { | |
| 88 under_kind = dtemplate->sub->kind; | |
| 89 if (universal) { | |
| 90 encode_kind = under_kind; | |
| 91 } | |
| 92 } else if (universal) { | |
| 93 under_kind = encode_kind & ~DER_POINTER; | |
| 94 } else { | |
| 95 under_kind = dtemplate->arg; | |
| 96 } | |
| 97 } else if (encode_kind & DER_INLINE) { | |
| 98 PORT_Assert (dtemplate->sub != NULL); | |
| 99 under_kind = dtemplate->sub->kind; | |
| 100 if (universal) { | |
| 101 encode_kind = under_kind; | |
| 102 } | |
| 103 } else if (universal) { | |
| 104 under_kind = encode_kind; | |
| 105 } else { | |
| 106 under_kind = dtemplate->arg; | |
| 107 } | |
| 108 | |
| 109 /* This is only used in decoding; it plays no part in encoding. */ | |
| 110 if (under_kind & DER_DERPTR) | |
| 111 return 0; | |
| 112 | |
| 113 /* No header at all for an "empty" optional. */ | |
| 114 if ((contents_len == 0) && optional) | |
| 115 return 0; | |
| 116 | |
| 117 /* And no header for a full DER_ANY. */ | |
| 118 if (encode_kind & DER_ANY) | |
| 119 return 0; | |
| 120 | |
| 121 /* | |
| 122 * The common case: one octet for identifier and as many octets | |
| 123 * as necessary to hold the content length. | |
| 124 */ | |
| 125 len = 1 + DER_LengthLength(contents_len); | |
| 126 | |
| 127 /* Account for the explicit wrapper, if necessary. */ | |
| 128 if (explicit) { | |
| 129 #if 0 /* | |
| 130 * Well, I was trying to do something useful, but these | |
| 131 * assertions are too restrictive on valid templates. | |
| 132 * I wanted to make sure that the top-level "kind" of | |
| 133 * a template does not also specify DER_EXPLICIT, which | |
| 134 * should only modify a component field. Maybe later | |
| 135 * I can figure out a better way to detect such a problem, | |
| 136 * but for now I must remove these checks altogether. | |
| 137 */ | |
| 138 /* | |
| 139 * This modifier applies only to components of a set or sequence; | |
| 140 * it should never be used on a set/sequence itself -- confirm. | |
| 141 */ | |
| 142 PORT_Assert (under_kind != DER_SEQUENCE); | |
| 143 PORT_Assert (under_kind != DER_SET); | |
| 144 #endif | |
| 145 | |
| 146 len += 1 + DER_LengthLength(len + contents_len); | |
| 147 } | |
| 148 | |
| 149 return len; | |
| 150 } | |
| 151 | |
| 152 | |
| 153 static PRUint32 | |
| 154 contents_length(DERTemplate *dtemplate, void *src) | |
| 155 { | |
| 156 PRUint32 len; | |
| 157 unsigned long encode_kind, under_kind; | |
| 158 PRBool universal; | |
| 159 | |
| 160 | |
| 161 PORT_Assert (src != NULL); | |
| 162 | |
| 163 encode_kind = dtemplate->kind; | |
| 164 | |
| 165 universal = ((encode_kind & DER_CLASS_MASK) == DER_UNIVERSAL) | |
| 166 ? PR_TRUE : PR_FALSE; | |
| 167 encode_kind &= ~DER_OPTIONAL; | |
| 168 | |
| 169 if (encode_kind & DER_POINTER) { | |
| 170 src = *(void **)src; | |
| 171 if (src == NULL) { | |
| 172 return 0; | |
| 173 } | |
| 174 if (dtemplate->sub != NULL) { | |
| 175 dtemplate = dtemplate->sub; | |
| 176 under_kind = dtemplate->kind; | |
| 177 src = (void *)((char *)src + dtemplate->offset); | |
| 178 } else if (universal) { | |
| 179 under_kind = encode_kind & ~DER_POINTER; | |
| 180 } else { | |
| 181 under_kind = dtemplate->arg; | |
| 182 } | |
| 183 } else if (encode_kind & DER_INLINE) { | |
| 184 PORT_Assert (dtemplate->sub != NULL); | |
| 185 dtemplate = dtemplate->sub; | |
| 186 under_kind = dtemplate->kind; | |
| 187 src = (void *)((char *)src + dtemplate->offset); | |
| 188 } else if (universal) { | |
| 189 under_kind = encode_kind; | |
| 190 } else { | |
| 191 under_kind = dtemplate->arg; | |
| 192 } | |
| 193 | |
| 194 /* Having any of these bits is not expected here... */ | |
| 195 PORT_Assert ((under_kind & (DER_EXPLICIT | DER_INLINE | DER_OPTIONAL | |
| 196 | DER_POINTER | DER_SKIP)) == 0); | |
| 197 | |
| 198 /* This is only used in decoding; it plays no part in encoding. */ | |
| 199 if (under_kind & DER_DERPTR) | |
| 200 return 0; | |
| 201 | |
| 202 if (under_kind & DER_INDEFINITE) { | |
| 203 PRUint32 sub_len; | |
| 204 void **indp = *(void ***)src; | |
| 205 | |
| 206 if (indp == NULL) | |
| 207 return 0; | |
| 208 | |
| 209 len = 0; | |
| 210 under_kind &= ~DER_INDEFINITE; | |
| 211 | |
| 212 if (under_kind == DER_SET || under_kind == DER_SEQUENCE) { | |
| 213 DERTemplate *tmpt = dtemplate->sub; | |
| 214 PORT_Assert (tmpt != NULL); | |
| 215 | |
| 216 for (; *indp != NULL; indp++) { | |
| 217 void *sub_src = (void *)((char *)(*indp) + tmpt->offset); | |
| 218 sub_len = contents_length (tmpt, sub_src); | |
| 219 len += sub_len + header_length (tmpt, sub_len); | |
| 220 } | |
| 221 } else { | |
| 222 /* | |
| 223 * XXX Lisa is not sure this code (for handling, for example, | |
| 224 * DER_INDEFINITE | DER_OCTET_STRING) is right. | |
| 225 */ | |
| 226 for (; *indp != NULL; indp++) { | |
| 227 SECItem *item = (SECItem *)(*indp); | |
| 228 sub_len = item->len; | |
| 229 if (under_kind == DER_BIT_STRING) { | |
| 230 sub_len = (sub_len + 7) >> 3; | |
| 231 /* bit string contents involve an extra octet */ | |
| 232 if (sub_len) | |
| 233 sub_len++; | |
| 234 } | |
| 235 if (under_kind != DER_ANY) | |
| 236 len += 1 + DER_LengthLength (sub_len); | |
| 237 } | |
| 238 } | |
| 239 | |
| 240 return len; | |
| 241 } | |
| 242 | |
| 243 switch (under_kind) { | |
| 244 case DER_SEQUENCE: | |
| 245 case DER_SET: | |
| 246 { | |
| 247 DERTemplate *tmpt; | |
| 248 void *sub_src; | |
| 249 PRUint32 sub_len; | |
| 250 | |
| 251 len = 0; | |
| 252 for (tmpt = dtemplate + 1; tmpt->kind; tmpt++) { | |
| 253 sub_src = (void *)((char *)src + tmpt->offset); | |
| 254 sub_len = contents_length (tmpt, sub_src); | |
| 255 len += sub_len + header_length (tmpt, sub_len); | |
| 256 } | |
| 257 } | |
| 258 break; | |
| 259 | |
| 260 case DER_BIT_STRING: | |
| 261 len = (((SECItem *)src)->len + 7) >> 3; | |
| 262 /* bit string contents involve an extra octet */ | |
| 263 if (len) | |
| 264 len++; | |
| 265 break; | |
| 266 | |
| 267 default: | |
| 268 len = ((SECItem *)src)->len; | |
| 269 break; | |
| 270 } | |
| 271 | |
| 272 return len; | |
| 273 } | |
| 274 | |
| 275 | |
| 276 static unsigned char * | |
| 277 der_encode(unsigned char *buf, DERTemplate *dtemplate, void *src) | |
| 278 { | |
| 279 int header_len; | |
| 280 PRUint32 contents_len; | |
| 281 unsigned long encode_kind, under_kind; | |
| 282 PRBool explicit, universal; | |
| 283 | |
| 284 | |
| 285 /* | |
| 286 * First figure out how long the encoding will be. Do this by | |
| 287 * traversing the template from top to bottom and accumulating | |
| 288 * the length of each leaf item. | |
| 289 */ | |
| 290 contents_len = contents_length (dtemplate, src); | |
| 291 header_len = header_length (dtemplate, contents_len); | |
| 292 | |
| 293 /* | |
| 294 * Enough smarts was involved already, so that if both the | |
| 295 * header and the contents have a length of zero, then we | |
| 296 * are not doing any encoding for this element. | |
| 297 */ | |
| 298 if (header_len == 0 && contents_len == 0) | |
| 299 return buf; | |
| 300 | |
| 301 encode_kind = dtemplate->kind; | |
| 302 | |
| 303 explicit = (encode_kind & DER_EXPLICIT) ? PR_TRUE : PR_FALSE; | |
| 304 encode_kind &= ~DER_OPTIONAL; | |
| 305 universal = ((encode_kind & DER_CLASS_MASK) == DER_UNIVERSAL) | |
| 306 ? PR_TRUE : PR_FALSE; | |
| 307 | |
| 308 if (encode_kind & DER_POINTER) { | |
| 309 if (contents_len) { | |
| 310 src = *(void **)src; | |
| 311 PORT_Assert (src != NULL); | |
| 312 } | |
| 313 if (dtemplate->sub != NULL) { | |
| 314 dtemplate = dtemplate->sub; | |
| 315 under_kind = dtemplate->kind; | |
| 316 if (universal) { | |
| 317 encode_kind = under_kind; | |
| 318 } | |
| 319 src = (void *)((char *)src + dtemplate->offset); | |
| 320 } else if (universal) { | |
| 321 under_kind = encode_kind & ~DER_POINTER; | |
| 322 } else { | |
| 323 under_kind = dtemplate->arg; | |
| 324 } | |
| 325 } else if (encode_kind & DER_INLINE) { | |
| 326 dtemplate = dtemplate->sub; | |
| 327 under_kind = dtemplate->kind; | |
| 328 if (universal) { | |
| 329 encode_kind = under_kind; | |
| 330 } | |
| 331 src = (void *)((char *)src + dtemplate->offset); | |
| 332 } else if (universal) { | |
| 333 under_kind = encode_kind; | |
| 334 } else { | |
| 335 under_kind = dtemplate->arg; | |
| 336 } | |
| 337 | |
| 338 if (explicit) { | |
| 339 buf = DER_StoreHeader (buf, encode_kind, | |
| 340 (1 + DER_LengthLength(contents_len) | |
| 341 + contents_len)); | |
| 342 encode_kind = under_kind; | |
| 343 } | |
| 344 | |
| 345 if ((encode_kind & DER_ANY) == 0) { /* DER_ANY already contains header */ | |
| 346 buf = DER_StoreHeader (buf, encode_kind, contents_len); | |
| 347 } | |
| 348 | |
| 349 /* If no real contents to encode, then we are done. */ | |
| 350 if (contents_len == 0) | |
| 351 return buf; | |
| 352 | |
| 353 if (under_kind & DER_INDEFINITE) { | |
| 354 void **indp; | |
| 355 | |
| 356 indp = *(void ***)src; | |
| 357 PORT_Assert (indp != NULL); | |
| 358 | |
| 359 under_kind &= ~DER_INDEFINITE; | |
| 360 if (under_kind == DER_SET || under_kind == DER_SEQUENCE) { | |
| 361 DERTemplate *tmpt = dtemplate->sub; | |
| 362 PORT_Assert (tmpt != NULL); | |
| 363 for (; *indp != NULL; indp++) { | |
| 364 void *sub_src = (void *)((char *)(*indp) + tmpt->offset); | |
| 365 buf = der_encode (buf, tmpt, sub_src); | |
| 366 } | |
| 367 } else { | |
| 368 for (; *indp != NULL; indp++) { | |
| 369 SECItem *item; | |
| 370 int sub_len; | |
| 371 | |
| 372 item = (SECItem *)(*indp); | |
| 373 sub_len = item->len; | |
| 374 if (under_kind == DER_BIT_STRING) { | |
| 375 if (sub_len) { | |
| 376 int rem; | |
| 377 | |
| 378 sub_len = (sub_len + 7) >> 3; | |
| 379 buf = DER_StoreHeader (buf, under_kind, sub_len + 1); | |
| 380 rem = (sub_len << 3) - item->len; | |
| 381 *buf++ = rem; /* remaining bits */ | |
| 382 } else { | |
| 383 buf = DER_StoreHeader (buf, under_kind, 0); | |
| 384 } | |
| 385 } else if (under_kind != DER_ANY) { | |
| 386 buf = DER_StoreHeader (buf, under_kind, sub_len); | |
| 387 } | |
| 388 PORT_Memcpy (buf, item->data, sub_len); | |
| 389 buf += sub_len; | |
| 390 } | |
| 391 } | |
| 392 return buf; | |
| 393 } | |
| 394 | |
| 395 switch (under_kind) { | |
| 396 case DER_SEQUENCE: | |
| 397 case DER_SET: | |
| 398 { | |
| 399 DERTemplate *tmpt; | |
| 400 void *sub_src; | |
| 401 | |
| 402 for (tmpt = dtemplate + 1; tmpt->kind; tmpt++) { | |
| 403 sub_src = (void *)((char *)src + tmpt->offset); | |
| 404 buf = der_encode (buf, tmpt, sub_src); | |
| 405 } | |
| 406 } | |
| 407 break; | |
| 408 | |
| 409 case DER_BIT_STRING: | |
| 410 { | |
| 411 SECItem *item; | |
| 412 int rem; | |
| 413 | |
| 414 /* | |
| 415 * The contents length includes our extra octet; subtract | |
| 416 * it off so we just have the real string length there. | |
| 417 */ | |
| 418 contents_len--; | |
| 419 item = (SECItem *)src; | |
| 420 PORT_Assert (contents_len == ((item->len + 7) >> 3)); | |
| 421 rem = (contents_len << 3) - item->len; | |
| 422 *buf++ = rem; /* remaining bits */ | |
| 423 PORT_Memcpy (buf, item->data, contents_len); | |
| 424 buf += contents_len; | |
| 425 } | |
| 426 break; | |
| 427 | |
| 428 default: | |
| 429 { | |
| 430 SECItem *item; | |
| 431 | |
| 432 item = (SECItem *)src; | |
| 433 PORT_Assert (contents_len == item->len); | |
| 434 PORT_Memcpy (buf, item->data, contents_len); | |
| 435 buf += contents_len; | |
| 436 } | |
| 437 break; | |
| 438 } | |
| 439 | |
| 440 return buf; | |
| 441 } | |
| 442 | |
| 443 | |
| 444 SECStatus | |
| 445 DER_Encode(PLArenaPool *arena, SECItem *dest, DERTemplate *dtemplate, void *src) | |
| 446 { | |
| 447 unsigned int contents_len, header_len; | |
| 448 | |
| 449 src = (void **)((char *)src + dtemplate->offset); | |
| 450 | |
| 451 /* | |
| 452 * First figure out how long the encoding will be. Do this by | |
| 453 * traversing the template from top to bottom and accumulating | |
| 454 * the length of each leaf item. | |
| 455 */ | |
| 456 contents_len = contents_length (dtemplate, src); | |
| 457 header_len = header_length (dtemplate, contents_len); | |
| 458 | |
| 459 dest->len = contents_len + header_len; | |
| 460 | |
| 461 /* Allocate storage to hold the encoding */ | |
| 462 dest->data = (unsigned char*) PORT_ArenaAlloc(arena, dest->len); | |
| 463 if (dest->data == NULL) { | |
| 464 PORT_SetError(SEC_ERROR_NO_MEMORY); | |
| 465 return SECFailure; | |
| 466 } | |
| 467 | |
| 468 /* Now encode into the buffer */ | |
| 469 (void) der_encode (dest->data, dtemplate, src); | |
| 470 | |
| 471 return SECSuccess; | |
| 472 } | |
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Chromium Code Reviews
Issue 2078763002:
Delete bundled copy of NSS and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/nss@master