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| 1 /* crypto/asn1/a_int.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/bn.h> | |
| 63 | |
| 64 ASN1_INTEGER *ASN1_INTEGER_dup(const ASN1_INTEGER *x) | |
| 65 { return M_ASN1_INTEGER_dup(x);} | |
| 66 | |
| 67 int ASN1_INTEGER_cmp(const ASN1_INTEGER *x, const ASN1_INTEGER *y) | |
| 68 { | |
| 69 int neg, ret; | |
| 70 /* Compare signs */ | |
| 71 neg = x->type & V_ASN1_NEG; | |
| 72 if (neg != (y->type & V_ASN1_NEG)) | |
| 73 { | |
| 74 if (neg) | |
| 75 return -1; | |
| 76 else | |
| 77 return 1; | |
| 78 } | |
| 79 | |
| 80 ret = ASN1_STRING_cmp(x, y); | |
| 81 | |
| 82 if (neg) | |
| 83 return -ret; | |
| 84 else | |
| 85 return ret; | |
| 86 } | |
| 87 | |
| 88 | |
| 89 /* | |
| 90 * This converts an ASN1 INTEGER into its content encoding. | |
| 91 * The internal representation is an ASN1_STRING whose data is a big endian | |
| 92 * representation of the value, ignoring the sign. The sign is determined by | |
| 93 * the type: V_ASN1_INTEGER for positive and V_ASN1_NEG_INTEGER for negative. | |
| 94 * | |
| 95 * Positive integers are no problem: they are almost the same as the DER | |
| 96 * encoding, except if the first byte is >= 0x80 we need to add a zero pad. | |
| 97 * | |
| 98 * Negative integers are a bit trickier... | |
| 99 * The DER representation of negative integers is in 2s complement form. | |
| 100 * The internal form is converted by complementing each octet and finally | |
| 101 * adding one to the result. This can be done less messily with a little trick. | |
| 102 * If the internal form has trailing zeroes then they will become FF by the | |
| 103 * complement and 0 by the add one (due to carry) so just copy as many trailing | |
| 104 * zeros to the destination as there are in the source. The carry will add one | |
| 105 * to the last none zero octet: so complement this octet and add one and finally | |
| 106 * complement any left over until you get to the start of the string. | |
| 107 * | |
| 108 * Padding is a little trickier too. If the first bytes is > 0x80 then we pad | |
| 109 * with 0xff. However if the first byte is 0x80 and one of the following bytes | |
| 110 * is non-zero we pad with 0xff. The reason for this distinction is that 0x80 | |
| 111 * followed by optional zeros isn't padded. | |
| 112 */ | |
| 113 | |
| 114 int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp) | |
| 115 { | |
| 116 int pad=0,ret,i,neg; | |
| 117 unsigned char *p,*n,pb=0; | |
| 118 | |
| 119 if ((a == NULL) || (a->data == NULL)) return(0); | |
| 120 neg=a->type & V_ASN1_NEG; | |
| 121 if (a->length == 0) | |
| 122 ret=1; | |
| 123 else | |
| 124 { | |
| 125 ret=a->length; | |
| 126 i=a->data[0]; | |
| 127 if (!neg && (i > 127)) { | |
| 128 pad=1; | |
| 129 pb=0; | |
| 130 } else if(neg) { | |
| 131 if(i>128) { | |
| 132 pad=1; | |
| 133 pb=0xFF; | |
| 134 } else if(i == 128) { | |
| 135 /* | |
| 136 * Special case: if any other bytes non zero we pad: | |
| 137 * otherwise we don't. | |
| 138 */ | |
| 139 for(i = 1; i < a->length; i++) if(a->data[i]) { | |
| 140 pad=1; | |
| 141 pb=0xFF; | |
| 142 break; | |
| 143 } | |
| 144 } | |
| 145 } | |
| 146 ret+=pad; | |
| 147 } | |
| 148 if (pp == NULL) return(ret); | |
| 149 p= *pp; | |
| 150 | |
| 151 if (pad) *(p++)=pb; | |
| 152 if (a->length == 0) *(p++)=0; | |
| 153 else if (!neg) memcpy(p,a->data,(unsigned int)a->length); | |
| 154 else { | |
| 155 /* Begin at the end of the encoding */ | |
| 156 n=a->data + a->length - 1; | |
| 157 p += a->length - 1; | |
| 158 i = a->length; | |
| 159 /* Copy zeros to destination as long as source is zero */ | |
| 160 while(!*n) { | |
| 161 *(p--) = 0; | |
| 162 n--; | |
| 163 i--; | |
| 164 } | |
| 165 /* Complement and increment next octet */ | |
| 166 *(p--) = ((*(n--)) ^ 0xff) + 1; | |
| 167 i--; | |
| 168 /* Complement any octets left */ | |
| 169 for(;i > 0; i--) *(p--) = *(n--) ^ 0xff; | |
| 170 } | |
| 171 | |
| 172 *pp+=ret; | |
| 173 return(ret); | |
| 174 } | |
| 175 | |
| 176 /* Convert just ASN1 INTEGER content octets to ASN1_INTEGER structure */ | |
| 177 | |
| 178 ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **a, const unsigned char **pp, | |
| 179 long len) | |
| 180 { | |
| 181 ASN1_INTEGER *ret=NULL; | |
| 182 const unsigned char *p, *pend; | |
| 183 unsigned char *to,*s; | |
| 184 int i; | |
| 185 | |
| 186 if ((a == NULL) || ((*a) == NULL)) | |
| 187 { | |
| 188 if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL); | |
| 189 ret->type=V_ASN1_INTEGER; | |
| 190 } | |
| 191 else | |
| 192 ret=(*a); | |
| 193 | |
| 194 p= *pp; | |
| 195 pend = p + len; | |
| 196 | |
| 197 /* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it | |
| 198 * signifies a missing NULL parameter. */ | |
| 199 s=(unsigned char *)OPENSSL_malloc((int)len+1); | |
| 200 if (s == NULL) | |
| 201 { | |
| 202 i=ERR_R_MALLOC_FAILURE; | |
| 203 goto err; | |
| 204 } | |
| 205 to=s; | |
| 206 if(!len) { | |
| 207 /* Strictly speaking this is an illegal INTEGER but we | |
| 208 * tolerate it. | |
| 209 */ | |
| 210 ret->type=V_ASN1_INTEGER; | |
| 211 } else if (*p & 0x80) /* a negative number */ | |
| 212 { | |
| 213 ret->type=V_ASN1_NEG_INTEGER; | |
| 214 if ((*p == 0xff) && (len != 1)) { | |
| 215 p++; | |
| 216 len--; | |
| 217 } | |
| 218 i = len; | |
| 219 p += i - 1; | |
| 220 to += i - 1; | |
| 221 while((!*p) && i) { | |
| 222 *(to--) = 0; | |
| 223 i--; | |
| 224 p--; | |
| 225 } | |
| 226 /* Special case: if all zeros then the number will be of | |
| 227 * the form FF followed by n zero bytes: this corresponds to | |
| 228 * 1 followed by n zero bytes. We've already written n zeros | |
| 229 * so we just append an extra one and set the first byte to | |
| 230 * a 1. This is treated separately because it is the only case | |
| 231 * where the number of bytes is larger than len. | |
| 232 */ | |
| 233 if(!i) { | |
| 234 *s = 1; | |
| 235 s[len] = 0; | |
| 236 len++; | |
| 237 } else { | |
| 238 *(to--) = (*(p--) ^ 0xff) + 1; | |
| 239 i--; | |
| 240 for(;i > 0; i--) *(to--) = *(p--) ^ 0xff; | |
| 241 } | |
| 242 } else { | |
| 243 ret->type=V_ASN1_INTEGER; | |
| 244 if ((*p == 0) && (len != 1)) | |
| 245 { | |
| 246 p++; | |
| 247 len--; | |
| 248 } | |
| 249 memcpy(s,p,(int)len); | |
| 250 } | |
| 251 | |
| 252 if (ret->data != NULL) OPENSSL_free(ret->data); | |
| 253 ret->data=s; | |
| 254 ret->length=(int)len; | |
| 255 if (a != NULL) (*a)=ret; | |
| 256 *pp=pend; | |
| 257 return(ret); | |
| 258 err: | |
| 259 ASN1err(ASN1_F_C2I_ASN1_INTEGER,i); | |
| 260 if ((ret != NULL) && ((a == NULL) || (*a != ret))) | |
| 261 M_ASN1_INTEGER_free(ret); | |
| 262 return(NULL); | |
| 263 } | |
| 264 | |
| 265 | |
| 266 /* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of | |
| 267 * ASN1 integers: some broken software can encode a positive INTEGER | |
| 268 * with its MSB set as negative (it doesn't add a padding zero). | |
| 269 */ | |
| 270 | |
| 271 ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a, const unsigned char **pp, | |
| 272 long length) | |
| 273 { | |
| 274 ASN1_INTEGER *ret=NULL; | |
| 275 const unsigned char *p; | |
| 276 unsigned char *s; | |
| 277 long len; | |
| 278 int inf,tag,xclass; | |
| 279 int i; | |
| 280 | |
| 281 if ((a == NULL) || ((*a) == NULL)) | |
| 282 { | |
| 283 if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL); | |
| 284 ret->type=V_ASN1_INTEGER; | |
| 285 } | |
| 286 else | |
| 287 ret=(*a); | |
| 288 | |
| 289 p= *pp; | |
| 290 inf=ASN1_get_object(&p,&len,&tag,&xclass,length); | |
| 291 if (inf & 0x80) | |
| 292 { | |
| 293 i=ASN1_R_BAD_OBJECT_HEADER; | |
| 294 goto err; | |
| 295 } | |
| 296 | |
| 297 if (tag != V_ASN1_INTEGER) | |
| 298 { | |
| 299 i=ASN1_R_EXPECTING_AN_INTEGER; | |
| 300 goto err; | |
| 301 } | |
| 302 | |
| 303 /* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it | |
| 304 * signifies a missing NULL parameter. */ | |
| 305 s=(unsigned char *)OPENSSL_malloc((int)len+1); | |
| 306 if (s == NULL) | |
| 307 { | |
| 308 i=ERR_R_MALLOC_FAILURE; | |
| 309 goto err; | |
| 310 } | |
| 311 ret->type=V_ASN1_INTEGER; | |
| 312 if(len) { | |
| 313 if ((*p == 0) && (len != 1)) | |
| 314 { | |
| 315 p++; | |
| 316 len--; | |
| 317 } | |
| 318 memcpy(s,p,(int)len); | |
| 319 p+=len; | |
| 320 } | |
| 321 | |
| 322 if (ret->data != NULL) OPENSSL_free(ret->data); | |
| 323 ret->data=s; | |
| 324 ret->length=(int)len; | |
| 325 if (a != NULL) (*a)=ret; | |
| 326 *pp=p; | |
| 327 return(ret); | |
| 328 err: | |
| 329 ASN1err(ASN1_F_D2I_ASN1_UINTEGER,i); | |
| 330 if ((ret != NULL) && ((a == NULL) || (*a != ret))) | |
| 331 M_ASN1_INTEGER_free(ret); | |
| 332 return(NULL); | |
| 333 } | |
| 334 | |
| 335 int ASN1_INTEGER_set(ASN1_INTEGER *a, long v) | |
| 336 { | |
| 337 int j,k; | |
| 338 unsigned int i; | |
| 339 unsigned char buf[sizeof(long)+1]; | |
| 340 long d; | |
| 341 | |
| 342 a->type=V_ASN1_INTEGER; | |
| 343 if (a->length < (int)(sizeof(long)+1)) | |
| 344 { | |
| 345 if (a->data != NULL) | |
| 346 OPENSSL_free(a->data); | |
| 347 if ((a->data=(unsigned char *)OPENSSL_malloc(sizeof(long)+1)) !=
NULL) | |
| 348 memset((char *)a->data,0,sizeof(long)+1); | |
| 349 } | |
| 350 if (a->data == NULL) | |
| 351 { | |
| 352 ASN1err(ASN1_F_ASN1_INTEGER_SET,ERR_R_MALLOC_FAILURE); | |
| 353 return(0); | |
| 354 } | |
| 355 d=v; | |
| 356 if (d < 0) | |
| 357 { | |
| 358 d= -d; | |
| 359 a->type=V_ASN1_NEG_INTEGER; | |
| 360 } | |
| 361 | |
| 362 for (i=0; i<sizeof(long); i++) | |
| 363 { | |
| 364 if (d == 0) break; | |
| 365 buf[i]=(int)d&0xff; | |
| 366 d>>=8; | |
| 367 } | |
| 368 j=0; | |
| 369 for (k=i-1; k >=0; k--) | |
| 370 a->data[j++]=buf[k]; | |
| 371 a->length=j; | |
| 372 return(1); | |
| 373 } | |
| 374 | |
| 375 long ASN1_INTEGER_get(const ASN1_INTEGER *a) | |
| 376 { | |
| 377 int neg=0,i; | |
| 378 long r=0; | |
| 379 | |
| 380 if (a == NULL) return(0L); | |
| 381 i=a->type; | |
| 382 if (i == V_ASN1_NEG_INTEGER) | |
| 383 neg=1; | |
| 384 else if (i != V_ASN1_INTEGER) | |
| 385 return -1; | |
| 386 | |
| 387 if (a->length > (int)sizeof(long)) | |
| 388 { | |
| 389 /* hmm... a bit ugly, return all ones */ | |
| 390 return -1; | |
| 391 } | |
| 392 if (a->data == NULL) | |
| 393 return 0; | |
| 394 | |
| 395 for (i=0; i<a->length; i++) | |
| 396 { | |
| 397 r<<=8; | |
| 398 r|=(unsigned char)a->data[i]; | |
| 399 } | |
| 400 if (neg) r= -r; | |
| 401 return(r); | |
| 402 } | |
| 403 | |
| 404 ASN1_INTEGER *BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai) | |
| 405 { | |
| 406 ASN1_INTEGER *ret; | |
| 407 int len,j; | |
| 408 | |
| 409 if (ai == NULL) | |
| 410 ret=M_ASN1_INTEGER_new(); | |
| 411 else | |
| 412 ret=ai; | |
| 413 if (ret == NULL) | |
| 414 { | |
| 415 ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_NESTED_ASN1_ERROR); | |
| 416 goto err; | |
| 417 } | |
| 418 if (BN_is_negative(bn)) | |
| 419 ret->type = V_ASN1_NEG_INTEGER; | |
| 420 else ret->type=V_ASN1_INTEGER; | |
| 421 j=BN_num_bits(bn); | |
| 422 len=((j == 0)?0:((j/8)+1)); | |
| 423 if (ret->length < len+4) | |
| 424 { | |
| 425 unsigned char *new_data=OPENSSL_realloc(ret->data, len+4); | |
| 426 if (!new_data) | |
| 427 { | |
| 428 ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_MALLOC_FAILURE); | |
| 429 goto err; | |
| 430 } | |
| 431 ret->data=new_data; | |
| 432 } | |
| 433 ret->length=BN_bn2bin(bn,ret->data); | |
| 434 /* Correct zero case */ | |
| 435 if(!ret->length) | |
| 436 { | |
| 437 ret->data[0] = 0; | |
| 438 ret->length = 1; | |
| 439 } | |
| 440 return(ret); | |
| 441 err: | |
| 442 if (ret != ai) M_ASN1_INTEGER_free(ret); | |
| 443 return(NULL); | |
| 444 } | |
| 445 | |
| 446 BIGNUM *ASN1_INTEGER_to_BN(const ASN1_INTEGER *ai, BIGNUM *bn) | |
| 447 { | |
| 448 BIGNUM *ret; | |
| 449 | |
| 450 if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL) | |
| 451 ASN1err(ASN1_F_ASN1_INTEGER_TO_BN,ASN1_R_BN_LIB); | |
| 452 else if(ai->type == V_ASN1_NEG_INTEGER) | |
| 453 BN_set_negative(ret, 1); | |
| 454 return(ret); | |
| 455 } | |
| 456 | |
| 457 IMPLEMENT_STACK_OF(ASN1_INTEGER) | |
| 458 IMPLEMENT_ASN1_SET_OF(ASN1_INTEGER) | |
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Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master