1 /* crypto/asn1/asn1_lib.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <stdio.h> 60 #include "cryptlib.h" 61 #include <openssl/asn1.h> 62 #include <openssl/asn1_mac.h> 63 64 static int asn1_get_length(unsigned char **pp,int *inf,long *rl,int max); 65 static void asn1_put_length(unsigned char **pp, int length); 66 const char *ASN1_version="ASN.1" OPENSSL_VERSION_PTEXT; 67 68 int ASN1_check_infinite_end(unsigned char **p, long len) 69 { 70 /* If there is 0 or 1 byte left, the length check should pick 71 * things up */ 72 if (len <= 0) 73 return(1); 74 else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) 75 { 76 (*p)+=2; 77 return(1); 78 } 79 return(0); 80 } 81 82 83 int ASN1_get_object(unsigned char **pp, long *plength, int *ptag, int *pclass, 84 long omax) 85 { 86 int i,ret; 87 long l; 88 unsigned char *p= *pp; 89 int tag,xclass,inf; 90 long max=omax; 91 92 if (!max) goto err; 93 ret=(*p&V_ASN1_CONSTRUCTED); 94 xclass=(*p&V_ASN1_PRIVATE); 95 i= *p&V_ASN1_PRIMITIVE_TAG; 96 if (i == V_ASN1_PRIMITIVE_TAG) 97 { /* high-tag */ 98 p++; 99 if (--max == 0) goto err; 100 l=0; 101 while (*p&0x80) 102 { 103 l<<=7L; 104 l|= *(p++)&0x7f; 105 if (--max == 0) goto err; 106 } 107 l<<=7L; 108 l|= *(p++)&0x7f; 109 tag=(int)l; 110 } 111 else 112 { 113 tag=i; 114 p++; 115 if (--max == 0) goto err; 116 } 117 *ptag=tag; 118 *pclass=xclass; 119 if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err; 120 121 #if 0 122 fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", 123 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength), 124 (int)(omax+ *pp)); 125 126 #endif 127 #if 0 128 if ((p+ *plength) > (omax+ *pp)) 129 { 130 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG); 131 /* Set this so that even if things are not long enough 132 * the values are set correctly */ 133 ret|=0x80; 134 } 135 #endif 136 *pp=p; 137 return(ret|inf); 138 err: 139 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG); 140 return(0x80); 141 } 142 143 static int asn1_get_length(unsigned char **pp, int *inf, long *rl, int max) 144 { 145 unsigned char *p= *pp; 146 long ret=0; 147 int i; 148 149 if (max-- < 1) return(0); 150 if (*p == 0x80) 151 { 152 *inf=1; 153 ret=0; 154 p++; 155 } 156 else 157 { 158 *inf=0; 159 i= *p&0x7f; 160 if (*(p++) & 0x80) 161 { 162 if (max-- == 0) return(0); 163 while (i-- > 0) 164 { 165 ret<<=8L; 166 ret|= *(p++); 167 if (max-- == 0) return(0); 168 } 169 } 170 else 171 ret=i; 172 } 173 *pp=p; 174 *rl=ret; 175 return(1); 176 } 177 178 /* class 0 is constructed 179 * constructed == 2 for indefinite length constructed */ 180 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 181 int xclass) 182 { 183 unsigned char *p= *pp; 184 int i, ttag; 185 186 i=(constructed)?V_ASN1_CONSTRUCTED:0; 187 i|=(xclass&V_ASN1_PRIVATE); 188 if (tag < 31) 189 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG); 190 else 191 { 192 *(p++)=i|V_ASN1_PRIMITIVE_TAG; 193 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7; 194 ttag = i; 195 while(i-- > 0) 196 { 197 p[i] = tag & 0x7f; 198 if(i != (ttag - 1)) p[i] |= 0x80; 199 tag >>= 7; 200 } 201 p += ttag; 202 } 203 if ((constructed == 2) && (length == 0)) 204 *(p++)=0x80; /* der_put_length would output 0 instead */ 205 else 206 asn1_put_length(&p,length); 207 *pp=p; 208 } 209 210 static void asn1_put_length(unsigned char **pp, int length) 211 { 212 unsigned char *p= *pp; 213 int i,l; 214 if (length <= 127) 215 *(p++)=(unsigned char)length; 216 else 217 { 218 l=length; 219 for (i=0; l > 0; i++) 220 l>>=8; 221 *(p++)=i|0x80; 222 l=i; 223 while (i-- > 0) 224 { 225 p[i]=length&0xff; 226 length>>=8; 227 } 228 p+=l; 229 } 230 *pp=p; 231 } 232 233 int ASN1_object_size(int constructed, int length, int tag) 234 { 235 int ret; 236 237 ret=length; 238 ret++; 239 if (tag >= 31) 240 { 241 while (tag > 0) 242 { 243 tag>>=7; 244 ret++; 245 } 246 } 247 if ((length == 0) && (constructed == 2)) 248 ret+=2; 249 ret++; 250 if (length > 127) 251 { 252 while (length > 0) 253 { 254 length>>=8; 255 ret++; 256 } 257 } 258 return(ret); 259 } 260 261 int asn1_Finish(ASN1_CTX *c) 262 { 263 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos)) 264 { 265 if (!ASN1_check_infinite_end(&c->p,c->slen)) 266 { 267 c->error=ERR_R_MISSING_ASN1_EOS; 268 return(0); 269 } 270 } 271 if ( ((c->slen != 0) && !(c->inf & 1)) || 272 ((c->slen < 0) && (c->inf & 1))) 273 { 274 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 275 return(0); 276 } 277 return(1); 278 } 279 280 int asn1_GetSequence(ASN1_CTX *c, long *length) 281 { 282 unsigned char *q; 283 284 q=c->p; 285 c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass), 286 *length); 287 if (c->inf & 0x80) 288 { 289 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL; 290 return(0); 291 } 292 if (c->tag != V_ASN1_SEQUENCE) 293 { 294 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE; 295 return(0); 296 } 297 (*length)-=(c->p-q); 298 if (c->max && (*length < 0)) 299 { 300 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 301 return(0); 302 } 303 if (c->inf == (1|V_ASN1_CONSTRUCTED)) 304 c->slen= *length; 305 c->eos=0; 306 return(1); 307 } 308 309 ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str) 310 { 311 ASN1_STRING *ret; 312 313 if (str == NULL) return(NULL); 314 if ((ret=ASN1_STRING_type_new(str->type)) == NULL) 315 return(NULL); 316 if (!ASN1_STRING_set(ret,str->data,str->length)) 317 { 318 ASN1_STRING_free(ret); 319 return(NULL); 320 } 321 ret->flags = str->flags; 322 return(ret); 323 } 324 325 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 326 { 327 unsigned char *c; 328 const char *data=_data; 329 330 if (len < 0) 331 { 332 if (data == NULL) 333 return(0); 334 else 335 len=strlen(data); 336 } 337 if ((str->length < len) || (str->data == NULL)) 338 { 339 c=str->data; 340 if (c == NULL) 341 str->data=OPENSSL_malloc(len+1); 342 else 343 str->data=OPENSSL_realloc(c,len+1); 344 345 if (str->data == NULL) 346 { 347 str->data=c; 348 return(0); 349 } 350 } 351 str->length=len; 352 if (data != NULL) 353 { 354 memcpy(str->data,data,len); 355 /* an allowance for strings :-) */ 356 str->data[len]='\0'; 357 } 358 return(1); 359 } 360 361 ASN1_STRING *ASN1_STRING_new(void) 362 { 363 return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 364 } 365 366 367 ASN1_STRING *ASN1_STRING_type_new(int type) 368 { 369 ASN1_STRING *ret; 370 371 ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING)); 372 if (ret == NULL) 373 { 374 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE); 375 return(NULL); 376 } 377 ret->length=0; 378 ret->type=type; 379 ret->data=NULL; 380 ret->flags=0; 381 return(ret); 382 } 383 384 void ASN1_STRING_free(ASN1_STRING *a) 385 { 386 if (a == NULL) return; 387 if (a->data != NULL) OPENSSL_free(a->data); 388 OPENSSL_free(a); 389 } 390 391 int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b) 392 { 393 int i; 394 395 i=(a->length-b->length); 396 if (i == 0) 397 { 398 i=memcmp(a->data,b->data,a->length); 399 if (i == 0) 400 return(a->type-b->type); 401 else 402 return(i); 403 } 404 else 405 return(i); 406 } 407 408 void asn1_add_error(unsigned char *address, int offset) 409 { 410 char buf1[16],buf2[16]; 411 412 sprintf(buf1,"%lu",(unsigned long)address); 413 sprintf(buf2,"%d",offset); 414 ERR_add_error_data(4,"address=",buf1," offset=",buf2); 415 } 416 417 int ASN1_STRING_length(ASN1_STRING *x) 418 { return M_ASN1_STRING_length(x); } 419 420 void ASN1_STRING_length_set(ASN1_STRING *x, int len) 421 { M_ASN1_STRING_length_set(x, len); return; } 422 423 int ASN1_STRING_type(ASN1_STRING *x) 424 { return M_ASN1_STRING_type(x); } 425 426 unsigned char * ASN1_STRING_data(ASN1_STRING *x) 427 { return M_ASN1_STRING_data(x); } 428