Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* tasn_enc.c */ |
| 2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| 3 | * project 2000. |
| 4 | */ |
| 5 | /* ==================================================================== |
| 6 | * Copyright (c) 2000-2004 The OpenSSL Project. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in |
| 17 | * the documentation and/or other materials provided with the |
| 18 | * distribution. |
| 19 | * |
| 20 | * 3. All advertising materials mentioning features or use of this |
| 21 | * software must display the following acknowledgment: |
| 22 | * "This product includes software developed by the OpenSSL Project |
| 23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| 24 | * |
| 25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 26 | * endorse or promote products derived from this software without |
| 27 | * prior written permission. For written permission, please contact |
| 28 | * licensing@OpenSSL.org. |
| 29 | * |
| 30 | * 5. Products derived from this software may not be called "OpenSSL" |
| 31 | * nor may "OpenSSL" appear in their names without prior written |
| 32 | * permission of the OpenSSL Project. |
| 33 | * |
| 34 | * 6. Redistributions of any form whatsoever must retain the following |
| 35 | * acknowledgment: |
| 36 | * "This product includes software developed by the OpenSSL Project |
| 37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| 38 | * |
| 39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 50 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 51 | * ==================================================================== |
| 52 | * |
| 53 | * This product includes cryptographic software written by Eric Young |
| 54 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 55 | * Hudson (tjh@cryptsoft.com). |
| 56 | * |
| 57 | */ |
| 58 | |
| 59 | |
| 60 | #include <stddef.h> |
| 61 | #include <string.h> |
| 62 | #include "cryptlib.h" |
| 63 | #include <openssl/asn1.h> |
| 64 | #include <openssl/asn1t.h> |
| 65 | #include <openssl/objects.h> |
| 66 | |
| 67 | static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out, |
| 68 | const ASN1_ITEM *it, |
| 69 | int tag, int aclass); |
| 70 | static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out, |
| 71 | int skcontlen, const ASN1_ITEM *item, |
| 72 | int do_sort, int iclass); |
| 73 | static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out, |
| 74 | const ASN1_TEMPLATE *tt, |
| 75 | int tag, int aclass); |
| 76 | static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out, |
| 77 | const ASN1_ITEM *it, int flags); |
| 78 | |
| 79 | /* Top level i2d equivalents: the 'ndef' variant instructs the encoder |
| 80 | * to use indefinite length constructed encoding, where appropriate |
| 81 | */ |
| 82 | |
| 83 | int ASN1_item_ndef_i2d(ASN1_VALUE *val, unsigned char **out, |
| 84 | const ASN1_ITEM *it) |
| 85 | { |
| 86 | return asn1_item_flags_i2d(val, out, it, ASN1_TFLG_NDEF); |
| 87 | } |
| 88 | |
| 89 | int ASN1_item_i2d(ASN1_VALUE *val, unsigned char **out, const ASN1_ITEM *it) |
| 90 | { |
| 91 | return asn1_item_flags_i2d(val, out, it, 0); |
| 92 | } |
| 93 | |
| 94 | /* Encode an ASN1 item, this is use by the |
| 95 | * standard 'i2d' function. 'out' points to |
| 96 | * a buffer to output the data to. |
| 97 | * |
| 98 | * The new i2d has one additional feature. If the output |
| 99 | * buffer is NULL (i.e. *out == NULL) then a buffer is |
| 100 | * allocated and populated with the encoding. |
| 101 | */ |
| 102 | |
| 103 | static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out, |
| 104 | const ASN1_ITEM *it, int flags) |
| 105 | { |
| 106 | if (out && !*out) |
| 107 | { |
| 108 | unsigned char *p, *buf; |
| 109 | int len; |
| 110 | len = ASN1_item_ex_i2d(&val, NULL, it, -1, flags); |
| 111 | if (len <= 0) |
| 112 | return len; |
| 113 | buf = OPENSSL_malloc(len); |
| 114 | if (!buf) |
| 115 | return -1; |
| 116 | p = buf; |
| 117 | ASN1_item_ex_i2d(&val, &p, it, -1, flags); |
| 118 | *out = buf; |
| 119 | return len; |
| 120 | } |
| 121 | |
| 122 | return ASN1_item_ex_i2d(&val, out, it, -1, flags); |
| 123 | } |
| 124 | |
| 125 | /* Encode an item, taking care of IMPLICIT tagging (if any). |
| 126 | * This function performs the normal item handling: it can be |
| 127 | * used in external types. |
| 128 | */ |
| 129 | |
| 130 | int ASN1_item_ex_i2d(ASN1_VALUE **pval, unsigned char **out, |
| 131 | const ASN1_ITEM *it, int tag, int aclass) |
| 132 | { |
| 133 | const ASN1_TEMPLATE *tt = NULL; |
| 134 | unsigned char *p = NULL; |
| 135 | int i, seqcontlen, seqlen, ndef = 1; |
| 136 | const ASN1_COMPAT_FUNCS *cf; |
| 137 | const ASN1_EXTERN_FUNCS *ef; |
| 138 | const ASN1_AUX *aux = it->funcs; |
| 139 | ASN1_aux_cb *asn1_cb = 0; |
| 140 | |
| 141 | if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) |
| 142 | return 0; |
| 143 | |
| 144 | if (aux && aux->asn1_cb) |
| 145 | asn1_cb = aux->asn1_cb; |
| 146 | |
| 147 | switch(it->itype) |
| 148 | { |
| 149 | |
| 150 | case ASN1_ITYPE_PRIMITIVE: |
| 151 | if (it->templates) |
| 152 | return asn1_template_ex_i2d(pval, out, it->templates, |
| 153 | tag, aclass); |
| 154 | return asn1_i2d_ex_primitive(pval, out, it, tag, aclass); |
| 155 | break; |
| 156 | |
| 157 | case ASN1_ITYPE_MSTRING: |
| 158 | return asn1_i2d_ex_primitive(pval, out, it, -1, aclass); |
| 159 | |
| 160 | case ASN1_ITYPE_CHOICE: |
| 161 | if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL)) |
| 162 | return 0; |
| 163 | i = asn1_get_choice_selector(pval, it); |
| 164 | if ((i >= 0) && (i < it->tcount)) |
| 165 | { |
| 166 | ASN1_VALUE **pchval; |
| 167 | const ASN1_TEMPLATE *chtt; |
| 168 | chtt = it->templates + i; |
| 169 | pchval = asn1_get_field_ptr(pval, chtt); |
| 170 | return asn1_template_ex_i2d(pchval, out, chtt, |
| 171 | -1, aclass); |
| 172 | } |
| 173 | /* Fixme: error condition if selector out of range */ |
| 174 | if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it, NULL)) |
| 175 | return 0; |
| 176 | break; |
| 177 | |
| 178 | case ASN1_ITYPE_EXTERN: |
| 179 | /* If new style i2d it does all the work */ |
| 180 | ef = it->funcs; |
| 181 | return ef->asn1_ex_i2d(pval, out, it, tag, aclass); |
| 182 | |
| 183 | case ASN1_ITYPE_COMPAT: |
| 184 | /* old style hackery... */ |
| 185 | cf = it->funcs; |
| 186 | if (out) |
| 187 | p = *out; |
| 188 | i = cf->asn1_i2d(*pval, out); |
| 189 | /* Fixup for IMPLICIT tag: note this messes up for tags > 30, |
| 190 | * but so did the old code. Tags > 30 are very rare anyway. |
| 191 | */ |
| 192 | if (out && (tag != -1)) |
| 193 | *p = aclass | tag | (*p & V_ASN1_CONSTRUCTED); |
| 194 | return i; |
| 195 | |
| 196 | case ASN1_ITYPE_NDEF_SEQUENCE: |
| 197 | /* Use indefinite length constructed if requested */ |
| 198 | if (aclass & ASN1_TFLG_NDEF) ndef = 2; |
| 199 | /* fall through */ |
| 200 | |
| 201 | case ASN1_ITYPE_SEQUENCE: |
| 202 | i = asn1_enc_restore(&seqcontlen, out, pval, it); |
| 203 | /* An error occurred */ |
| 204 | if (i < 0) |
| 205 | return 0; |
| 206 | /* We have a valid cached encoding... */ |
| 207 | if (i > 0) |
| 208 | return seqcontlen; |
| 209 | /* Otherwise carry on */ |
| 210 | seqcontlen = 0; |
| 211 | /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */ |
| 212 | if (tag == -1) |
| 213 | { |
| 214 | tag = V_ASN1_SEQUENCE; |
| 215 | /* Retain any other flags in aclass */ |
| 216 | aclass = (aclass & ~ASN1_TFLG_TAG_CLASS) |
| 217 | | V_ASN1_UNIVERSAL; |
| 218 | } |
| 219 | if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL)) |
| 220 | return 0; |
| 221 | /* First work out sequence content length */ |
| 222 | for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) |
| 223 | { |
| 224 | const ASN1_TEMPLATE *seqtt; |
| 225 | ASN1_VALUE **pseqval; |
| 226 | seqtt = asn1_do_adb(pval, tt, 1); |
| 227 | if (!seqtt) |
| 228 | return 0; |
| 229 | pseqval = asn1_get_field_ptr(pval, seqtt); |
| 230 | /* FIXME: check for errors in enhanced version */ |
| 231 | seqcontlen += asn1_template_ex_i2d(pseqval, NULL, seqtt, |
| 232 | -1, aclass); |
| 233 | } |
| 234 | |
| 235 | seqlen = ASN1_object_size(ndef, seqcontlen, tag); |
| 236 | if (!out) |
| 237 | return seqlen; |
| 238 | /* Output SEQUENCE header */ |
| 239 | ASN1_put_object(out, ndef, seqcontlen, tag, aclass); |
| 240 | for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) |
| 241 | { |
| 242 | const ASN1_TEMPLATE *seqtt; |
| 243 | ASN1_VALUE **pseqval; |
| 244 | seqtt = asn1_do_adb(pval, tt, 1); |
| 245 | if (!seqtt) |
| 246 | return 0; |
| 247 | pseqval = asn1_get_field_ptr(pval, seqtt); |
| 248 | /* FIXME: check for errors in enhanced version */ |
| 249 | asn1_template_ex_i2d(pseqval, out, seqtt, -1, aclass); |
| 250 | } |
| 251 | if (ndef == 2) |
| 252 | ASN1_put_eoc(out); |
| 253 | if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it, NULL)) |
| 254 | return 0; |
| 255 | return seqlen; |
| 256 | |
| 257 | default: |
| 258 | return 0; |
| 259 | |
| 260 | } |
| 261 | return 0; |
| 262 | } |
| 263 | |
| 264 | int ASN1_template_i2d(ASN1_VALUE **pval, unsigned char **out, |
| 265 | const ASN1_TEMPLATE *tt) |
| 266 | { |
| 267 | return asn1_template_ex_i2d(pval, out, tt, -1, 0); |
| 268 | } |
| 269 | |
| 270 | static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out, |
| 271 | const ASN1_TEMPLATE *tt, int tag, int iclass) |
| 272 | { |
| 273 | int i, ret, flags, ttag, tclass, ndef; |
| 274 | flags = tt->flags; |
| 275 | /* Work out tag and class to use: tagging may come |
| 276 | * either from the template or the arguments, not both |
| 277 | * because this would create ambiguity. Additionally |
| 278 | * the iclass argument may contain some additional flags |
| 279 | * which should be noted and passed down to other levels. |
| 280 | */ |
| 281 | if (flags & ASN1_TFLG_TAG_MASK) |
| 282 | { |
| 283 | /* Error if argument and template tagging */ |
| 284 | if (tag != -1) |
| 285 | /* FIXME: error code here */ |
| 286 | return -1; |
| 287 | /* Get tagging from template */ |
| 288 | ttag = tt->tag; |
| 289 | tclass = flags & ASN1_TFLG_TAG_CLASS; |
| 290 | } |
| 291 | else if (tag != -1) |
| 292 | { |
| 293 | /* No template tagging, get from arguments */ |
| 294 | ttag = tag; |
| 295 | tclass = iclass & ASN1_TFLG_TAG_CLASS; |
| 296 | } |
| 297 | else |
| 298 | { |
| 299 | ttag = -1; |
| 300 | tclass = 0; |
| 301 | } |
| 302 | /* |
| 303 | * Remove any class mask from iflag. |
| 304 | */ |
| 305 | iclass &= ~ASN1_TFLG_TAG_CLASS; |
| 306 | |
| 307 | /* At this point 'ttag' contains the outer tag to use, |
| 308 | * 'tclass' is the class and iclass is any flags passed |
| 309 | * to this function. |
| 310 | */ |
| 311 | |
| 312 | /* if template and arguments require ndef, use it */ |
| 313 | if ((flags & ASN1_TFLG_NDEF) && (iclass & ASN1_TFLG_NDEF)) |
| 314 | ndef = 2; |
| 315 | else ndef = 1; |
| 316 | |
| 317 | if (flags & ASN1_TFLG_SK_MASK) |
| 318 | { |
| 319 | /* SET OF, SEQUENCE OF */ |
| 320 | STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval; |
| 321 | int isset, sktag, skaclass; |
| 322 | int skcontlen, sklen; |
| 323 | ASN1_VALUE *skitem; |
| 324 | |
| 325 | if (!*pval) |
| 326 | return 0; |
| 327 | |
| 328 | if (flags & ASN1_TFLG_SET_OF) |
| 329 | { |
| 330 | isset = 1; |
| 331 | /* 2 means we reorder */ |
| 332 | if (flags & ASN1_TFLG_SEQUENCE_OF) |
| 333 | isset = 2; |
| 334 | } |
| 335 | else isset = 0; |
| 336 | |
| 337 | /* Work out inner tag value: if EXPLICIT |
| 338 | * or no tagging use underlying type. |
| 339 | */ |
| 340 | if ((ttag != -1) && !(flags & ASN1_TFLG_EXPTAG)) |
| 341 | { |
| 342 | sktag = ttag; |
| 343 | skaclass = tclass; |
| 344 | } |
| 345 | else |
| 346 | { |
| 347 | skaclass = V_ASN1_UNIVERSAL; |
| 348 | if (isset) |
| 349 | sktag = V_ASN1_SET; |
| 350 | else sktag = V_ASN1_SEQUENCE; |
| 351 | } |
| 352 | |
| 353 | /* Determine total length of items */ |
| 354 | skcontlen = 0; |
| 355 | for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) |
| 356 | { |
| 357 | skitem = sk_ASN1_VALUE_value(sk, i); |
| 358 | skcontlen += ASN1_item_ex_i2d(&skitem, NULL, |
| 359 | ASN1_ITEM_ptr(tt->item), |
| 360 | -1, iclass); |
| 361 | } |
| 362 | sklen = ASN1_object_size(ndef, skcontlen, sktag); |
| 363 | /* If EXPLICIT need length of surrounding tag */ |
| 364 | if (flags & ASN1_TFLG_EXPTAG) |
| 365 | ret = ASN1_object_size(ndef, sklen, ttag); |
| 366 | else ret = sklen; |
| 367 | |
| 368 | if (!out) |
| 369 | return ret; |
| 370 | |
| 371 | /* Now encode this lot... */ |
| 372 | /* EXPLICIT tag */ |
| 373 | if (flags & ASN1_TFLG_EXPTAG) |
| 374 | ASN1_put_object(out, ndef, sklen, ttag, tclass); |
| 375 | /* SET or SEQUENCE and IMPLICIT tag */ |
| 376 | ASN1_put_object(out, ndef, skcontlen, sktag, skaclass); |
| 377 | /* And the stuff itself */ |
| 378 | asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item), |
| 379 | isset, iclass); |
| 380 | if (ndef == 2) |
| 381 | { |
| 382 | ASN1_put_eoc(out); |
| 383 | if (flags & ASN1_TFLG_EXPTAG) |
| 384 | ASN1_put_eoc(out); |
| 385 | } |
| 386 | |
| 387 | return ret; |
| 388 | } |
| 389 | |
| 390 | if (flags & ASN1_TFLG_EXPTAG) |
| 391 | { |
| 392 | /* EXPLICIT tagging */ |
| 393 | /* Find length of tagged item */ |
| 394 | i = ASN1_item_ex_i2d(pval, NULL, ASN1_ITEM_ptr(tt->item), |
| 395 | -1, iclass); |
| 396 | if (!i) |
| 397 | return 0; |
| 398 | /* Find length of EXPLICIT tag */ |
| 399 | ret = ASN1_object_size(ndef, i, ttag); |
| 400 | if (out) |
| 401 | { |
| 402 | /* Output tag and item */ |
| 403 | ASN1_put_object(out, ndef, i, ttag, tclass); |
| 404 | ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), |
| 405 | -1, iclass); |
| 406 | if (ndef == 2) |
| 407 | ASN1_put_eoc(out); |
| 408 | } |
| 409 | return ret; |
| 410 | } |
| 411 | |
| 412 | /* Either normal or IMPLICIT tagging: combine class and flags */ |
| 413 | return ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), |
| 414 | ttag, tclass | iclass); |
| 415 | |
| 416 | } |
| 417 | |
| 418 | /* Temporary structure used to hold DER encoding of items for SET OF */ |
| 419 | |
| 420 | typedef struct { |
| 421 | unsigned char *data; |
| 422 | int length; |
| 423 | ASN1_VALUE *field; |
| 424 | } DER_ENC; |
| 425 | |
| 426 | static int der_cmp(const void *a, const void *b) |
| 427 | { |
| 428 | const DER_ENC *d1 = a, *d2 = b; |
| 429 | int cmplen, i; |
| 430 | cmplen = (d1->length < d2->length) ? d1->length : d2->length; |
| 431 | i = memcmp(d1->data, d2->data, cmplen); |
| 432 | if (i) |
| 433 | return i; |
| 434 | return d1->length - d2->length; |
| 435 | } |
| 436 | |
| 437 | /* Output the content octets of SET OF or SEQUENCE OF */ |
| 438 | |
| 439 | static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out, |
| 440 | int skcontlen, const ASN1_ITEM *item, |
| 441 | int do_sort, int iclass) |
| 442 | { |
| 443 | int i; |
| 444 | ASN1_VALUE *skitem; |
| 445 | unsigned char *tmpdat = NULL, *p = NULL; |
| 446 | DER_ENC *derlst = NULL, *tder; |
| 447 | if (do_sort) |
| 448 | { |
| 449 | /* Don't need to sort less than 2 items */ |
| 450 | if (sk_ASN1_VALUE_num(sk) < 2) |
| 451 | do_sort = 0; |
| 452 | else |
| 453 | { |
| 454 | derlst = OPENSSL_malloc(sk_ASN1_VALUE_num(sk) |
| 455 | * sizeof(*derlst)); |
| 456 | tmpdat = OPENSSL_malloc(skcontlen); |
| 457 | if (!derlst || !tmpdat) |
| 458 | return 0; |
| 459 | } |
| 460 | } |
| 461 | /* If not sorting just output each item */ |
| 462 | if (!do_sort) |
| 463 | { |
| 464 | for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) |
| 465 | { |
| 466 | skitem = sk_ASN1_VALUE_value(sk, i); |
| 467 | ASN1_item_ex_i2d(&skitem, out, item, -1, iclass); |
| 468 | } |
| 469 | return 1; |
| 470 | } |
| 471 | p = tmpdat; |
| 472 | |
| 473 | /* Doing sort: build up a list of each member's DER encoding */ |
| 474 | for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) |
| 475 | { |
| 476 | skitem = sk_ASN1_VALUE_value(sk, i); |
| 477 | tder->data = p; |
| 478 | tder->length = ASN1_item_ex_i2d(&skitem, &p, item, -1, iclass); |
| 479 | tder->field = skitem; |
| 480 | } |
| 481 | |
| 482 | /* Now sort them */ |
| 483 | qsort(derlst, sk_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp); |
| 484 | /* Output sorted DER encoding */ |
| 485 | p = *out; |
| 486 | for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) |
| 487 | { |
| 488 | memcpy(p, tder->data, tder->length); |
| 489 | p += tder->length; |
| 490 | } |
| 491 | *out = p; |
| 492 | /* If do_sort is 2 then reorder the STACK */ |
| 493 | if (do_sort == 2) |
| 494 | { |
| 495 | for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); |
| 496 | i++, tder++) |
| 497 | (void)sk_ASN1_VALUE_set(sk, i, tder->field); |
| 498 | } |
| 499 | OPENSSL_free(derlst); |
| 500 | OPENSSL_free(tmpdat); |
| 501 | return 1; |
| 502 | } |
| 503 | |
| 504 | static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out, |
| 505 | const ASN1_ITEM *it, int tag, int aclass) |
| 506 | { |
| 507 | int len; |
| 508 | int utype; |
| 509 | int usetag; |
| 510 | int ndef = 0; |
| 511 | |
| 512 | utype = it->utype; |
| 513 | |
| 514 | /* Get length of content octets and maybe find |
| 515 | * out the underlying type. |
| 516 | */ |
| 517 | |
| 518 | len = asn1_ex_i2c(pval, NULL, &utype, it); |
| 519 | |
| 520 | /* If SEQUENCE, SET or OTHER then header is |
| 521 | * included in pseudo content octets so don't |
| 522 | * include tag+length. We need to check here |
| 523 | * because the call to asn1_ex_i2c() could change |
| 524 | * utype. |
| 525 | */ |
| 526 | if ((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) || |
| 527 | (utype == V_ASN1_OTHER)) |
| 528 | usetag = 0; |
| 529 | else usetag = 1; |
| 530 | |
| 531 | /* -1 means omit type */ |
| 532 | |
| 533 | if (len == -1) |
| 534 | return 0; |
| 535 | |
| 536 | /* -2 return is special meaning use ndef */ |
| 537 | if (len == -2) |
| 538 | { |
| 539 | ndef = 2; |
| 540 | len = 0; |
| 541 | } |
| 542 | |
| 543 | /* If not implicitly tagged get tag from underlying type */ |
| 544 | if (tag == -1) tag = utype; |
| 545 | |
| 546 | /* Output tag+length followed by content octets */ |
| 547 | if (out) |
| 548 | { |
| 549 | if (usetag) |
| 550 | ASN1_put_object(out, ndef, len, tag, aclass); |
| 551 | asn1_ex_i2c(pval, *out, &utype, it); |
| 552 | if (ndef) |
| 553 | ASN1_put_eoc(out); |
| 554 | else |
| 555 | *out += len; |
| 556 | } |
| 557 | |
| 558 | if (usetag) |
| 559 | return ASN1_object_size(ndef, len, tag); |
| 560 | return len; |
| 561 | } |
| 562 | |
| 563 | /* Produce content octets from a structure */ |
| 564 | |
| 565 | int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *putype, |
| 566 | const ASN1_ITEM *it) |
| 567 | { |
| 568 | ASN1_BOOLEAN *tbool = NULL; |
| 569 | ASN1_STRING *strtmp; |
| 570 | ASN1_OBJECT *otmp; |
| 571 | int utype; |
| 572 | const unsigned char *cont; |
| 573 | unsigned char c; |
| 574 | int len; |
| 575 | const ASN1_PRIMITIVE_FUNCS *pf; |
| 576 | pf = it->funcs; |
| 577 | if (pf && pf->prim_i2c) |
| 578 | return pf->prim_i2c(pval, cout, putype, it); |
| 579 | |
| 580 | /* Should type be omitted? */ |
| 581 | if ((it->itype != ASN1_ITYPE_PRIMITIVE) |
| 582 | || (it->utype != V_ASN1_BOOLEAN)) |
| 583 | { |
| 584 | if (!*pval) return -1; |
| 585 | } |
| 586 | |
| 587 | if (it->itype == ASN1_ITYPE_MSTRING) |
| 588 | { |
| 589 | /* If MSTRING type set the underlying type */ |
| 590 | strtmp = (ASN1_STRING *)*pval; |
| 591 | utype = strtmp->type; |
| 592 | *putype = utype; |
| 593 | } |
| 594 | else if (it->utype == V_ASN1_ANY) |
| 595 | { |
| 596 | /* If ANY set type and pointer to value */ |
| 597 | ASN1_TYPE *typ; |
| 598 | typ = (ASN1_TYPE *)*pval; |
| 599 | utype = typ->type; |
| 600 | *putype = utype; |
| 601 | pval = &typ->value.asn1_value; |
| 602 | } |
| 603 | else utype = *putype; |
| 604 | |
| 605 | switch(utype) |
| 606 | { |
| 607 | case V_ASN1_OBJECT: |
| 608 | otmp = (ASN1_OBJECT *)*pval; |
| 609 | cont = otmp->data; |
| 610 | len = otmp->length; |
| 611 | break; |
| 612 | |
| 613 | case V_ASN1_NULL: |
| 614 | cont = NULL; |
| 615 | len = 0; |
| 616 | break; |
| 617 | |
| 618 | case V_ASN1_BOOLEAN: |
| 619 | tbool = (ASN1_BOOLEAN *)pval; |
| 620 | if (*tbool == -1) |
| 621 | return -1; |
| 622 | if (it->utype != V_ASN1_ANY) |
| 623 | { |
| 624 | /* Default handling if value == size field then omit */ |
| 625 | if (*tbool && (it->size > 0)) |
| 626 | return -1; |
| 627 | if (!*tbool && !it->size) |
| 628 | return -1; |
| 629 | } |
| 630 | c = (unsigned char)*tbool; |
| 631 | cont = &c; |
| 632 | len = 1; |
| 633 | break; |
| 634 | |
| 635 | case V_ASN1_BIT_STRING: |
| 636 | return i2c_ASN1_BIT_STRING((ASN1_BIT_STRING *)*pval, |
| 637 | cout ? &cout : NULL); |
| 638 | break; |
| 639 | |
| 640 | case V_ASN1_INTEGER: |
| 641 | case V_ASN1_NEG_INTEGER: |
| 642 | case V_ASN1_ENUMERATED: |
| 643 | case V_ASN1_NEG_ENUMERATED: |
| 644 | /* These are all have the same content format |
| 645 | * as ASN1_INTEGER |
| 646 | */ |
| 647 | return i2c_ASN1_INTEGER((ASN1_INTEGER *)*pval, |
| 648 | cout ? &cout : NULL); |
| 649 | break; |
| 650 | |
| 651 | case V_ASN1_OCTET_STRING: |
| 652 | case V_ASN1_NUMERICSTRING: |
| 653 | case V_ASN1_PRINTABLESTRING: |
| 654 | case V_ASN1_T61STRING: |
| 655 | case V_ASN1_VIDEOTEXSTRING: |
| 656 | case V_ASN1_IA5STRING: |
| 657 | case V_ASN1_UTCTIME: |
| 658 | case V_ASN1_GENERALIZEDTIME: |
| 659 | case V_ASN1_GRAPHICSTRING: |
| 660 | case V_ASN1_VISIBLESTRING: |
| 661 | case V_ASN1_GENERALSTRING: |
| 662 | case V_ASN1_UNIVERSALSTRING: |
| 663 | case V_ASN1_BMPSTRING: |
| 664 | case V_ASN1_UTF8STRING: |
| 665 | case V_ASN1_SEQUENCE: |
| 666 | case V_ASN1_SET: |
| 667 | default: |
| 668 | /* All based on ASN1_STRING and handled the same */ |
| 669 | strtmp = (ASN1_STRING *)*pval; |
| 670 | /* Special handling for NDEF */ |
| 671 | if ((it->size == ASN1_TFLG_NDEF) |
| 672 | && (strtmp->flags & ASN1_STRING_FLAG_NDEF)) |
| 673 | { |
| 674 | if (cout) |
| 675 | { |
| 676 | strtmp->data = cout; |
| 677 | strtmp->length = 0; |
| 678 | } |
| 679 | /* Special return code */ |
| 680 | return -2; |
| 681 | } |
| 682 | cont = strtmp->data; |
| 683 | len = strtmp->length; |
| 684 | |
| 685 | break; |
| 686 | |
| 687 | } |
| 688 | if (cout && len) |
| 689 | memcpy(cout, cont, len); |
| 690 | return len; |
| 691 | } |