1 /* $OpenBSD: a_bitstr.c,v 1.31 2021/12/15 18:00:31 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/conf.h> 64 #include <openssl/err.h> 65 #include <openssl/x509v3.h> 66 67 int 68 ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len) 69 { 70 return ASN1_STRING_set(x, d, len); 71 } 72 73 int 74 i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) 75 { 76 int ret, j, bits, len; 77 unsigned char *p, *d; 78 79 if (a == NULL) 80 return (0); 81 82 len = a->length; 83 84 if (len > 0) { 85 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) { 86 bits = (int)a->flags & 0x07; 87 } else { 88 for (; len > 0; len--) { 89 if (a->data[len - 1]) 90 break; 91 } 92 j = a->data[len - 1]; 93 if (j & 0x01) 94 bits = 0; 95 else if (j & 0x02) 96 bits = 1; 97 else if (j & 0x04) 98 bits = 2; 99 else if (j & 0x08) 100 bits = 3; 101 else if (j & 0x10) 102 bits = 4; 103 else if (j & 0x20) 104 bits = 5; 105 else if (j & 0x40) 106 bits = 6; 107 else if (j & 0x80) 108 bits = 7; 109 else 110 bits = 0; /* should not happen */ 111 } 112 } else 113 bits = 0; 114 115 ret = 1 + len; 116 if (pp == NULL) 117 return (ret); 118 119 p= *pp; 120 121 *(p++) = (unsigned char)bits; 122 d = a->data; 123 if (len > 0) { 124 memcpy(p, d, len); 125 p += len; 126 p[-1] &= 0xff << bits; 127 } 128 *pp = p; 129 return (ret); 130 } 131 132 ASN1_BIT_STRING * 133 c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, const unsigned char **pp, long len) 134 { 135 ASN1_BIT_STRING *ret = NULL; 136 const unsigned char *p; 137 unsigned char *s; 138 int i; 139 140 if (len < 1) { 141 ASN1error(ASN1_R_STRING_TOO_SHORT); 142 goto err; 143 } 144 145 if (a == NULL || *a == NULL) { 146 if ((ret = ASN1_BIT_STRING_new()) == NULL) 147 return (NULL); 148 } else 149 ret = *a; 150 151 p = *pp; 152 i = *(p++); 153 if (i > 7) { 154 ASN1error(ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 155 goto err; 156 } 157 158 /* 159 * We do this to preserve the settings. If we modify the settings, 160 * via the _set_bit function, we will recalculate on output. 161 */ 162 ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */ 163 ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | i); /* set */ 164 165 /* using one because of the bits left byte */ 166 if (len-- > 1) { 167 if ((s = malloc(len)) == NULL) { 168 ASN1error(ERR_R_MALLOC_FAILURE); 169 goto err; 170 } 171 memcpy(s, p, len); 172 s[len - 1] &= (0xff << i); 173 p += len; 174 } else 175 s = NULL; 176 177 free(ret->data); 178 ret->data = s; 179 ret->length = (int)len; 180 ret->type = V_ASN1_BIT_STRING; 181 182 if (a != NULL) 183 *a = ret; 184 185 *pp = p; 186 187 return (ret); 188 189 err: 190 if (a == NULL || *a != ret) 191 ASN1_BIT_STRING_free(ret); 192 193 return (NULL); 194 } 195 196 int 197 ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) 198 { 199 int w, v, iv; 200 unsigned char *c; 201 202 w = n/8; 203 v = 1 << (7 - (n & 0x07)); 204 iv = ~v; 205 if (!value) 206 v = 0; 207 208 if (a == NULL) 209 return 0; 210 211 a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */ 212 213 if ((a->length < (w + 1)) || (a->data == NULL)) { 214 if (!value) 215 return(1); /* Don't need to set */ 216 if ((c = recallocarray(a->data, a->length, w + 1, 1)) == NULL) { 217 ASN1error(ERR_R_MALLOC_FAILURE); 218 return 0; 219 } 220 a->data = c; 221 a->length = w + 1; 222 } 223 a->data[w] = ((a->data[w]) & iv) | v; 224 while ((a->length > 0) && (a->data[a->length - 1] == 0)) 225 a->length--; 226 227 return (1); 228 } 229 230 int 231 ASN1_BIT_STRING_get_bit(const ASN1_BIT_STRING *a, int n) 232 { 233 int w, v; 234 235 w = n / 8; 236 v = 1 << (7 - (n & 0x07)); 237 if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL)) 238 return (0); 239 return ((a->data[w] & v) != 0); 240 } 241 242 /* 243 * Checks if the given bit string contains only bits specified by 244 * the flags vector. Returns 0 if there is at least one bit set in 'a' 245 * which is not specified in 'flags', 1 otherwise. 246 * 'len' is the length of 'flags'. 247 */ 248 int 249 ASN1_BIT_STRING_check(const ASN1_BIT_STRING *a, const unsigned char *flags, 250 int flags_len) 251 { 252 int i, ok; 253 254 /* Check if there is one bit set at all. */ 255 if (!a || !a->data) 256 return 1; 257 258 /* Check each byte of the internal representation of the bit string. */ 259 ok = 1; 260 for (i = 0; i < a->length && ok; ++i) { 261 unsigned char mask = i < flags_len ? ~flags[i] : 0xff; 262 /* We are done if there is an unneeded bit set. */ 263 ok = (a->data[i] & mask) == 0; 264 } 265 return ok; 266 } 267 268 int 269 ASN1_BIT_STRING_name_print(BIO *out, ASN1_BIT_STRING *bs, 270 BIT_STRING_BITNAME *tbl, int indent) 271 { 272 BIT_STRING_BITNAME *bnam; 273 char first = 1; 274 275 BIO_printf(out, "%*s", indent, ""); 276 for (bnam = tbl; bnam->lname; bnam++) { 277 if (ASN1_BIT_STRING_get_bit(bs, bnam->bitnum)) { 278 if (!first) 279 BIO_puts(out, ", "); 280 BIO_puts(out, bnam->lname); 281 first = 0; 282 } 283 } 284 BIO_puts(out, "\n"); 285 return 1; 286 } 287 288 int 289 ASN1_BIT_STRING_set_asc(ASN1_BIT_STRING *bs, const char *name, int value, 290 BIT_STRING_BITNAME *tbl) 291 { 292 int bitnum; 293 294 bitnum = ASN1_BIT_STRING_num_asc(name, tbl); 295 if (bitnum < 0) 296 return 0; 297 if (bs) { 298 if (!ASN1_BIT_STRING_set_bit(bs, bitnum, value)) 299 return 0; 300 } 301 return 1; 302 } 303 304 int 305 ASN1_BIT_STRING_num_asc(const char *name, BIT_STRING_BITNAME *tbl) 306 { 307 BIT_STRING_BITNAME *bnam; 308 309 for (bnam = tbl; bnam->lname; bnam++) { 310 if (!strcmp(bnam->sname, name) || 311 !strcmp(bnam->lname, name)) 312 return bnam->bitnum; 313 } 314 return -1; 315 } 316