a_bitstr.c revision 280297
155714Skris/* crypto/asn1/a_bitstr.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 8280297Sjkim * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15280297Sjkim * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 22280297Sjkim * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 37280297Sjkim * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40280297Sjkim * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 52280297Sjkim * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include <stdio.h> 6055714Skris#include "cryptlib.h" 6155714Skris#include <openssl/asn1.h> 6255714Skris 6359191Skrisint ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len) 64280297Sjkim{ 65280297Sjkim return M_ASN1_BIT_STRING_set(x, d, len); 66280297Sjkim} 6759191Skris 6868651Skrisint i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) 69280297Sjkim{ 70280297Sjkim int ret, j, bits, len; 71280297Sjkim unsigned char *p, *d; 7255714Skris 73280297Sjkim if (a == NULL) 74280297Sjkim return (0); 7555714Skris 76280297Sjkim len = a->length; 7755714Skris 78280297Sjkim if (len > 0) { 79280297Sjkim if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) { 80280297Sjkim bits = (int)a->flags & 0x07; 81280297Sjkim } else { 82280297Sjkim for (; len > 0; len--) { 83280297Sjkim if (a->data[len - 1]) 84280297Sjkim break; 85280297Sjkim } 86280297Sjkim j = a->data[len - 1]; 87280297Sjkim if (j & 0x01) 88280297Sjkim bits = 0; 89280297Sjkim else if (j & 0x02) 90280297Sjkim bits = 1; 91280297Sjkim else if (j & 0x04) 92280297Sjkim bits = 2; 93280297Sjkim else if (j & 0x08) 94280297Sjkim bits = 3; 95280297Sjkim else if (j & 0x10) 96280297Sjkim bits = 4; 97280297Sjkim else if (j & 0x20) 98280297Sjkim bits = 5; 99280297Sjkim else if (j & 0x40) 100280297Sjkim bits = 6; 101280297Sjkim else if (j & 0x80) 102280297Sjkim bits = 7; 103280297Sjkim else 104280297Sjkim bits = 0; /* should not happen */ 105280297Sjkim } 106280297Sjkim } else 107280297Sjkim bits = 0; 108100936Snectar 109280297Sjkim ret = 1 + len; 110280297Sjkim if (pp == NULL) 111280297Sjkim return (ret); 112100936Snectar 113280297Sjkim p = *pp; 11455714Skris 115280297Sjkim *(p++) = (unsigned char)bits; 116280297Sjkim d = a->data; 117280297Sjkim memcpy(p, d, len); 118280297Sjkim p += len; 119280297Sjkim if (len > 0) 120280297Sjkim p[-1] &= (0xff << bits); 121280297Sjkim *pp = p; 122280297Sjkim return (ret); 123280297Sjkim} 12455714Skris 125160814SsimonASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, 126280297Sjkim const unsigned char **pp, long len) 127280297Sjkim{ 128280297Sjkim ASN1_BIT_STRING *ret = NULL; 129280297Sjkim const unsigned char *p; 130280297Sjkim unsigned char *s; 131280297Sjkim int i; 13268651Skris 133280297Sjkim if (len < 1) { 134280297Sjkim i = ASN1_R_STRING_TOO_SHORT; 135280297Sjkim goto err; 136280297Sjkim } 137109998Smarkm 138280297Sjkim if ((a == NULL) || ((*a) == NULL)) { 139280297Sjkim if ((ret = M_ASN1_BIT_STRING_new()) == NULL) 140280297Sjkim return (NULL); 141280297Sjkim } else 142280297Sjkim ret = (*a); 14368651Skris 144280297Sjkim p = *pp; 145280297Sjkim i = *(p++); 146280297Sjkim if (i > 7) { 147280297Sjkim i = ASN1_R_INVALID_BIT_STRING_BITS_LEFT; 148280297Sjkim goto err; 149280297Sjkim } 150280297Sjkim /* 151280297Sjkim * We do this to preserve the settings. If we modify the settings, via 152280297Sjkim * the _set_bit function, we will recalculate on output 153280297Sjkim */ 154280297Sjkim ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */ 155280297Sjkim ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | i); /* set */ 15655714Skris 157280297Sjkim if (len-- > 1) { /* using one because of the bits left byte */ 158280297Sjkim s = (unsigned char *)OPENSSL_malloc((int)len); 159280297Sjkim if (s == NULL) { 160280297Sjkim i = ERR_R_MALLOC_FAILURE; 161280297Sjkim goto err; 162280297Sjkim } 163280297Sjkim memcpy(s, p, (int)len); 164280297Sjkim s[len - 1] &= (0xff << i); 165280297Sjkim p += len; 166280297Sjkim } else 167280297Sjkim s = NULL; 16855714Skris 169280297Sjkim ret->length = (int)len; 170280297Sjkim if (ret->data != NULL) 171280297Sjkim OPENSSL_free(ret->data); 172280297Sjkim ret->data = s; 173280297Sjkim ret->type = V_ASN1_BIT_STRING; 174280297Sjkim if (a != NULL) 175280297Sjkim (*a) = ret; 176280297Sjkim *pp = p; 177280297Sjkim return (ret); 178280297Sjkim err: 179280297Sjkim ASN1err(ASN1_F_C2I_ASN1_BIT_STRING, i); 180280297Sjkim if ((ret != NULL) && ((a == NULL) || (*a != ret))) 181280297Sjkim M_ASN1_BIT_STRING_free(ret); 182280297Sjkim return (NULL); 183280297Sjkim} 18455714Skris 185280297Sjkim/* 186280297Sjkim * These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de> 18755714Skris */ 18855714Skrisint ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) 189280297Sjkim{ 190280297Sjkim int w, v, iv; 191280297Sjkim unsigned char *c; 19255714Skris 193280297Sjkim w = n / 8; 194280297Sjkim v = 1 << (7 - (n & 0x07)); 195280297Sjkim iv = ~v; 196280297Sjkim if (!value) 197280297Sjkim v = 0; 19855714Skris 199280297Sjkim if (a == NULL) 200280297Sjkim return 0; 201160814Ssimon 202280297Sjkim a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */ 20355714Skris 204280297Sjkim if ((a->length < (w + 1)) || (a->data == NULL)) { 205280297Sjkim if (!value) 206280297Sjkim return (1); /* Don't need to set */ 207280297Sjkim if (a->data == NULL) 208280297Sjkim c = (unsigned char *)OPENSSL_malloc(w + 1); 209280297Sjkim else 210280297Sjkim c = (unsigned char *)OPENSSL_realloc_clean(a->data, 211280297Sjkim a->length, w + 1); 212280297Sjkim if (c == NULL) { 213280297Sjkim ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT, ERR_R_MALLOC_FAILURE); 214280297Sjkim return 0; 215280297Sjkim } 216280297Sjkim if (w + 1 - a->length > 0) 217280297Sjkim memset(c + a->length, 0, w + 1 - a->length); 218280297Sjkim a->data = c; 219280297Sjkim a->length = w + 1; 220280297Sjkim } 221280297Sjkim a->data[w] = ((a->data[w]) & iv) | v; 222280297Sjkim while ((a->length > 0) && (a->data[a->length - 1] == 0)) 223280297Sjkim a->length--; 224280297Sjkim return (1); 225280297Sjkim} 22655714Skris 22755714Skrisint ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n) 228280297Sjkim{ 229280297Sjkim int w, v; 23055714Skris 231280297Sjkim w = n / 8; 232280297Sjkim v = 1 << (7 - (n & 0x07)); 233280297Sjkim if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL)) 234280297Sjkim return (0); 235280297Sjkim return ((a->data[w] & v) != 0); 236280297Sjkim} 23755714Skris 238238405Sjkim/* 239280297Sjkim * Checks if the given bit string contains only bits specified by 240238405Sjkim * the flags vector. Returns 0 if there is at least one bit set in 'a' 241238405Sjkim * which is not specified in 'flags', 1 otherwise. 242238405Sjkim * 'len' is the length of 'flags'. 243238405Sjkim */ 244238405Sjkimint ASN1_BIT_STRING_check(ASN1_BIT_STRING *a, 245280297Sjkim unsigned char *flags, int flags_len) 246280297Sjkim{ 247280297Sjkim int i, ok; 248280297Sjkim /* Check if there is one bit set at all. */ 249280297Sjkim if (!a || !a->data) 250280297Sjkim return 1; 251238405Sjkim 252280297Sjkim /* 253280297Sjkim * Check each byte of the internal representation of the bit string. 254280297Sjkim */ 255280297Sjkim ok = 1; 256280297Sjkim for (i = 0; i < a->length && ok; ++i) { 257280297Sjkim unsigned char mask = i < flags_len ? ~flags[i] : 0xff; 258280297Sjkim /* We are done if there is an unneeded bit set. */ 259280297Sjkim ok = (a->data[i] & mask) == 0; 260280297Sjkim } 261280297Sjkim return ok; 262280297Sjkim} 263