1 /* $OpenBSD: a_enum.c,v 1.29 2023/07/05 21:23:36 beck Exp $ */ 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 <limits.h> 60 #include <string.h> 61 62 #include <openssl/asn1.h> 63 #include <openssl/asn1t.h> 64 #include <openssl/bn.h> 65 #include <openssl/buffer.h> 66 #include <openssl/err.h> 67 68 #include "asn1_local.h" 69 #include "bytestring.h" 70 71 /* 72 * Code for ENUMERATED type: identical to INTEGER apart from a different tag. 73 * for comments on encoding see a_int.c 74 */ 75 76 const ASN1_ITEM ASN1_ENUMERATED_it = { 77 .itype = ASN1_ITYPE_PRIMITIVE, 78 .utype = V_ASN1_ENUMERATED, 79 .sname = "ASN1_ENUMERATED", 80 }; 81 82 ASN1_ENUMERATED * 83 ASN1_ENUMERATED_new(void) 84 { 85 return (ASN1_ENUMERATED *)ASN1_item_new(&ASN1_ENUMERATED_it); 86 } 87 LCRYPTO_ALIAS(ASN1_ENUMERATED_new); 88 89 static void 90 asn1_aenum_clear(ASN1_ENUMERATED *aenum) 91 { 92 freezero(aenum->data, aenum->length); 93 94 memset(aenum, 0, sizeof(*aenum)); 95 96 aenum->type = V_ASN1_ENUMERATED; 97 } 98 99 void 100 ASN1_ENUMERATED_free(ASN1_ENUMERATED *a) 101 { 102 ASN1_item_free((ASN1_VALUE *)a, &ASN1_ENUMERATED_it); 103 } 104 LCRYPTO_ALIAS(ASN1_ENUMERATED_free); 105 106 int 107 ASN1_ENUMERATED_get_int64(int64_t *out_val, const ASN1_ENUMERATED *aenum) 108 { 109 CBS cbs; 110 111 *out_val = 0; 112 113 if (aenum == NULL || aenum->length < 0) 114 return 0; 115 116 if (aenum->type != V_ASN1_ENUMERATED && 117 aenum->type != V_ASN1_NEG_ENUMERATED) { 118 ASN1error(ASN1_R_WRONG_INTEGER_TYPE); 119 return 0; 120 } 121 122 CBS_init(&cbs, aenum->data, aenum->length); 123 124 return asn1_aint_get_int64(&cbs, (aenum->type == V_ASN1_NEG_ENUMERATED), 125 out_val); 126 } 127 LCRYPTO_ALIAS(ASN1_ENUMERATED_get_int64); 128 129 int 130 ASN1_ENUMERATED_set_int64(ASN1_ENUMERATED *aenum, int64_t val) 131 { 132 uint64_t uval; 133 134 asn1_aenum_clear(aenum); 135 136 uval = (uint64_t)val; 137 138 if (val < 0) { 139 aenum->type = V_ASN1_NEG_ENUMERATED; 140 uval = -uval; 141 } 142 143 return asn1_aint_set_uint64(uval, &aenum->data, &aenum->length); 144 } 145 LCRYPTO_ALIAS(ASN1_ENUMERATED_set_int64); 146 147 long 148 ASN1_ENUMERATED_get(const ASN1_ENUMERATED *aenum) 149 { 150 int64_t val; 151 152 if (aenum == NULL) 153 return 0; 154 if (!ASN1_ENUMERATED_get_int64(&val, aenum)) 155 return -1; 156 if (val < LONG_MIN || val > LONG_MAX) { 157 /* hmm... a bit ugly, return all ones */ 158 return -1; 159 } 160 161 return (long)val; 162 } 163 LCRYPTO_ALIAS(ASN1_ENUMERATED_get); 164 165 int 166 ASN1_ENUMERATED_set(ASN1_ENUMERATED *aenum, long val) 167 { 168 return ASN1_ENUMERATED_set_int64(aenum, val); 169 } 170 LCRYPTO_ALIAS(ASN1_ENUMERATED_set); 171 172 ASN1_ENUMERATED * 173 BN_to_ASN1_ENUMERATED(const BIGNUM *bn, ASN1_ENUMERATED *ai) 174 { 175 ASN1_ENUMERATED *ret; 176 int len, j; 177 178 if (ai == NULL) 179 ret = ASN1_ENUMERATED_new(); 180 else 181 ret = ai; 182 if (ret == NULL) { 183 ASN1error(ERR_R_NESTED_ASN1_ERROR); 184 goto err; 185 } 186 if (BN_is_negative(bn)) 187 ret->type = V_ASN1_NEG_ENUMERATED; 188 else 189 ret->type = V_ASN1_ENUMERATED; 190 j = BN_num_bits(bn); 191 len = ((j == 0) ? 0 : ((j / 8) + 1)); 192 if (ret->length < len + 4) { 193 unsigned char *new_data = realloc(ret->data, len + 4); 194 if (!new_data) { 195 ASN1error(ERR_R_MALLOC_FAILURE); 196 goto err; 197 } 198 ret->data = new_data; 199 } 200 ret->length = BN_bn2bin(bn, ret->data); 201 202 /* Correct zero case */ 203 if (!ret->length) { 204 ret->data[0] = 0; 205 ret->length = 1; 206 } 207 return (ret); 208 209 err: 210 if (ret != ai) 211 ASN1_ENUMERATED_free(ret); 212 return (NULL); 213 } 214 LCRYPTO_ALIAS(BN_to_ASN1_ENUMERATED); 215 216 BIGNUM * 217 ASN1_ENUMERATED_to_BN(const ASN1_ENUMERATED *ai, BIGNUM *bn) 218 { 219 BIGNUM *ret; 220 221 if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL) 222 ASN1error(ASN1_R_BN_LIB); 223 else if (ai->type == V_ASN1_NEG_ENUMERATED) 224 BN_set_negative(ret, 1); 225 return (ret); 226 } 227 LCRYPTO_ALIAS(ASN1_ENUMERATED_to_BN); 228 229 /* Based on a_int.c: equivalent ENUMERATED functions */ 230 231 int 232 i2a_ASN1_ENUMERATED(BIO *bp, const ASN1_ENUMERATED *a) 233 { 234 int i, n = 0; 235 static const char h[] = "0123456789ABCDEF"; 236 char buf[2]; 237 238 if (a == NULL) 239 return (0); 240 241 if (a->length == 0) { 242 if (BIO_write(bp, "00", 2) != 2) 243 goto err; 244 n = 2; 245 } else { 246 for (i = 0; i < a->length; i++) { 247 if ((i != 0) && (i % 35 == 0)) { 248 if (BIO_write(bp, "\\\n", 2) != 2) 249 goto err; 250 n += 2; 251 } 252 buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f]; 253 buf[1] = h[((unsigned char)a->data[i]) & 0x0f]; 254 if (BIO_write(bp, buf, 2) != 2) 255 goto err; 256 n += 2; 257 } 258 } 259 return (n); 260 261 err: 262 return (-1); 263 } 264 LCRYPTO_ALIAS(i2a_ASN1_ENUMERATED); 265 266 int 267 a2i_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *bs, char *buf, int size) 268 { 269 int ret = 0; 270 int i, j,k, m,n, again, bufsize; 271 unsigned char *s = NULL, *sp; 272 unsigned char *bufp; 273 int first = 1; 274 size_t num = 0, slen = 0; 275 276 bs->type = V_ASN1_ENUMERATED; 277 278 bufsize = BIO_gets(bp, buf, size); 279 for (;;) { 280 if (bufsize < 1) 281 goto err_sl; 282 i = bufsize; 283 if (buf[i-1] == '\n') 284 buf[--i] = '\0'; 285 if (i == 0) 286 goto err_sl; 287 if (buf[i-1] == '\r') 288 buf[--i] = '\0'; 289 if (i == 0) 290 goto err_sl; 291 if (buf[i - 1] == '\\') { 292 i--; 293 again = 1; 294 } else 295 again = 0; 296 buf[i] = '\0'; 297 if (i < 2) 298 goto err_sl; 299 300 bufp = (unsigned char *)buf; 301 if (first) { 302 first = 0; 303 if ((bufp[0] == '0') && (buf[1] == '0')) { 304 bufp += 2; 305 i -= 2; 306 } 307 } 308 k = 0; 309 if (i % 2 != 0) { 310 ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS); 311 goto err; 312 } 313 i /= 2; 314 if (num + i > slen) { 315 sp = realloc(s, num + i); 316 if (sp == NULL) { 317 ASN1error(ERR_R_MALLOC_FAILURE); 318 goto err; 319 } 320 s = sp; 321 slen = num + i; 322 } 323 for (j = 0; j < i; j++, k += 2) { 324 for (n = 0; n < 2; n++) { 325 m = bufp[k + n]; 326 if ((m >= '0') && (m <= '9')) 327 m -= '0'; 328 else if ((m >= 'a') && (m <= 'f')) 329 m = m - 'a' + 10; 330 else if ((m >= 'A') && (m <= 'F')) 331 m = m - 'A' + 10; 332 else { 333 ASN1error(ASN1_R_NON_HEX_CHARACTERS); 334 goto err; 335 } 336 s[num + j] <<= 4; 337 s[num + j] |= m; 338 } 339 } 340 num += i; 341 if (again) 342 bufsize = BIO_gets(bp, buf, size); 343 else 344 break; 345 } 346 bs->length = num; 347 bs->data = s; 348 return (1); 349 350 err_sl: 351 ASN1error(ASN1_R_SHORT_LINE); 352 err: 353 free(s); 354 return (ret); 355 } 356 LCRYPTO_ALIAS(a2i_ASN1_ENUMERATED); 357 358 int 359 c2i_ASN1_ENUMERATED_cbs(ASN1_ENUMERATED **out_aenum, CBS *cbs) 360 { 361 ASN1_ENUMERATED *aenum = NULL; 362 363 if (out_aenum == NULL) 364 return 0; 365 366 if (*out_aenum != NULL) { 367 ASN1_INTEGER_free(*out_aenum); 368 *out_aenum = NULL; 369 } 370 371 if (!c2i_ASN1_INTEGER_cbs((ASN1_INTEGER **)&aenum, cbs)) 372 return 0; 373 374 aenum->type = V_ASN1_ENUMERATED | (aenum->type & V_ASN1_NEG); 375 *out_aenum = aenum; 376 377 return 1; 378 } 379 380 int 381 i2d_ASN1_ENUMERATED(ASN1_ENUMERATED *a, unsigned char **out) 382 { 383 return ASN1_item_i2d((ASN1_VALUE *)a, out, &ASN1_ENUMERATED_it); 384 } 385 LCRYPTO_ALIAS(i2d_ASN1_ENUMERATED); 386 387 ASN1_ENUMERATED * 388 d2i_ASN1_ENUMERATED(ASN1_ENUMERATED **a, const unsigned char **in, long len) 389 { 390 return (ASN1_ENUMERATED *)ASN1_item_d2i((ASN1_VALUE **)a, in, len, 391 &ASN1_ENUMERATED_it); 392 } 393 LCRYPTO_ALIAS(d2i_ASN1_ENUMERATED); 394