1 /* $OpenBSD: a_bitstr.c,v 1.33 2021/12/25 08:52:44 jsing 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 <stdio.h> 60 #include <string.h> 61 62 #include <openssl/asn1.h> 63 #include <openssl/asn1t.h> 64 #include <openssl/conf.h> 65 #include <openssl/err.h> 66 #include <openssl/x509v3.h> 67 68 const ASN1_ITEM ASN1_BIT_STRING_it = { 69 .itype = ASN1_ITYPE_PRIMITIVE, 70 .utype = V_ASN1_BIT_STRING, 71 .sname = "ASN1_BIT_STRING", 72 }; 73 74 ASN1_BIT_STRING * 75 ASN1_BIT_STRING_new(void) 76 { 77 return (ASN1_BIT_STRING *)ASN1_item_new(&ASN1_BIT_STRING_it); 78 } 79 80 void 81 ASN1_BIT_STRING_free(ASN1_BIT_STRING *a) 82 { 83 ASN1_item_free((ASN1_VALUE *)a, &ASN1_BIT_STRING_it); 84 } 85 86 int 87 ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len) 88 { 89 return ASN1_STRING_set(x, d, len); 90 } 91 92 int 93 ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) 94 { 95 int w, v, iv; 96 unsigned char *c; 97 98 w = n/8; 99 v = 1 << (7 - (n & 0x07)); 100 iv = ~v; 101 if (!value) 102 v = 0; 103 104 if (a == NULL) 105 return 0; 106 107 a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */ 108 109 if ((a->length < (w + 1)) || (a->data == NULL)) { 110 if (!value) 111 return(1); /* Don't need to set */ 112 if ((c = recallocarray(a->data, a->length, w + 1, 1)) == NULL) { 113 ASN1error(ERR_R_MALLOC_FAILURE); 114 return 0; 115 } 116 a->data = c; 117 a->length = w + 1; 118 } 119 a->data[w] = ((a->data[w]) & iv) | v; 120 while ((a->length > 0) && (a->data[a->length - 1] == 0)) 121 a->length--; 122 123 return (1); 124 } 125 126 int 127 ASN1_BIT_STRING_get_bit(const ASN1_BIT_STRING *a, int n) 128 { 129 int w, v; 130 131 w = n / 8; 132 v = 1 << (7 - (n & 0x07)); 133 if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL)) 134 return (0); 135 return ((a->data[w] & v) != 0); 136 } 137 138 /* 139 * Checks if the given bit string contains only bits specified by 140 * the flags vector. Returns 0 if there is at least one bit set in 'a' 141 * which is not specified in 'flags', 1 otherwise. 142 * 'len' is the length of 'flags'. 143 */ 144 int 145 ASN1_BIT_STRING_check(const ASN1_BIT_STRING *a, const unsigned char *flags, 146 int flags_len) 147 { 148 int i, ok; 149 150 /* Check if there is one bit set at all. */ 151 if (!a || !a->data) 152 return 1; 153 154 /* Check each byte of the internal representation of the bit string. */ 155 ok = 1; 156 for (i = 0; i < a->length && ok; ++i) { 157 unsigned char mask = i < flags_len ? ~flags[i] : 0xff; 158 /* We are done if there is an unneeded bit set. */ 159 ok = (a->data[i] & mask) == 0; 160 } 161 return ok; 162 } 163 164 int 165 ASN1_BIT_STRING_name_print(BIO *out, ASN1_BIT_STRING *bs, 166 BIT_STRING_BITNAME *tbl, int indent) 167 { 168 BIT_STRING_BITNAME *bnam; 169 char first = 1; 170 171 BIO_printf(out, "%*s", indent, ""); 172 for (bnam = tbl; bnam->lname; bnam++) { 173 if (ASN1_BIT_STRING_get_bit(bs, bnam->bitnum)) { 174 if (!first) 175 BIO_puts(out, ", "); 176 BIO_puts(out, bnam->lname); 177 first = 0; 178 } 179 } 180 BIO_puts(out, "\n"); 181 return 1; 182 } 183 184 int 185 ASN1_BIT_STRING_set_asc(ASN1_BIT_STRING *bs, const char *name, int value, 186 BIT_STRING_BITNAME *tbl) 187 { 188 int bitnum; 189 190 bitnum = ASN1_BIT_STRING_num_asc(name, tbl); 191 if (bitnum < 0) 192 return 0; 193 if (bs) { 194 if (!ASN1_BIT_STRING_set_bit(bs, bitnum, value)) 195 return 0; 196 } 197 return 1; 198 } 199 200 int 201 ASN1_BIT_STRING_num_asc(const char *name, BIT_STRING_BITNAME *tbl) 202 { 203 BIT_STRING_BITNAME *bnam; 204 205 for (bnam = tbl; bnam->lname; bnam++) { 206 if (!strcmp(bnam->sname, name) || 207 !strcmp(bnam->lname, name)) 208 return bnam->bitnum; 209 } 210 return -1; 211 } 212 213 int 214 i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) 215 { 216 int ret, j, bits, len; 217 unsigned char *p, *d; 218 219 if (a == NULL) 220 return (0); 221 222 len = a->length; 223 224 if (len > 0) { 225 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) { 226 bits = (int)a->flags & 0x07; 227 } else { 228 for (; len > 0; len--) { 229 if (a->data[len - 1]) 230 break; 231 } 232 j = a->data[len - 1]; 233 if (j & 0x01) 234 bits = 0; 235 else if (j & 0x02) 236 bits = 1; 237 else if (j & 0x04) 238 bits = 2; 239 else if (j & 0x08) 240 bits = 3; 241 else if (j & 0x10) 242 bits = 4; 243 else if (j & 0x20) 244 bits = 5; 245 else if (j & 0x40) 246 bits = 6; 247 else if (j & 0x80) 248 bits = 7; 249 else 250 bits = 0; /* should not happen */ 251 } 252 } else 253 bits = 0; 254 255 ret = 1 + len; 256 if (pp == NULL) 257 return (ret); 258 259 p= *pp; 260 261 *(p++) = (unsigned char)bits; 262 d = a->data; 263 if (len > 0) { 264 memcpy(p, d, len); 265 p += len; 266 p[-1] &= 0xff << bits; 267 } 268 *pp = p; 269 return (ret); 270 } 271 272 ASN1_BIT_STRING * 273 c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, const unsigned char **pp, long len) 274 { 275 ASN1_BIT_STRING *ret = NULL; 276 const unsigned char *p; 277 unsigned char *s; 278 int i; 279 280 if (len < 1) { 281 ASN1error(ASN1_R_STRING_TOO_SHORT); 282 goto err; 283 } 284 285 if (a == NULL || *a == NULL) { 286 if ((ret = ASN1_BIT_STRING_new()) == NULL) 287 return (NULL); 288 } else 289 ret = *a; 290 291 p = *pp; 292 i = *(p++); 293 if (i > 7) { 294 ASN1error(ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 295 goto err; 296 } 297 298 /* 299 * We do this to preserve the settings. If we modify the settings, 300 * via the _set_bit function, we will recalculate on output. 301 */ 302 ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */ 303 ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | i); /* set */ 304 305 /* using one because of the bits left byte */ 306 if (len-- > 1) { 307 if ((s = malloc(len)) == NULL) { 308 ASN1error(ERR_R_MALLOC_FAILURE); 309 goto err; 310 } 311 memcpy(s, p, len); 312 s[len - 1] &= (0xff << i); 313 p += len; 314 } else 315 s = NULL; 316 317 free(ret->data); 318 ret->data = s; 319 ret->length = (int)len; 320 ret->type = V_ASN1_BIT_STRING; 321 322 if (a != NULL) 323 *a = ret; 324 325 *pp = p; 326 327 return (ret); 328 329 err: 330 if (a == NULL || *a != ret) 331 ASN1_BIT_STRING_free(ret); 332 333 return (NULL); 334 } 335 336 int 337 i2d_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **out) 338 { 339 return ASN1_item_i2d((ASN1_VALUE *)a, out, &ASN1_BIT_STRING_it); 340 } 341 342 ASN1_BIT_STRING * 343 d2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, const unsigned char **in, long len) 344 { 345 return (ASN1_BIT_STRING *)ASN1_item_d2i((ASN1_VALUE **)a, in, len, 346 &ASN1_BIT_STRING_it); 347 } 348