1/* crypto/asn1/a_bitstr.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 <stdlib.h> 61#include <string.h> 62#include <time.h> 63 64#if 0 65#include "cryptlib.h" 66#include <openssl/asn1.h> 67#else 68#include "cs-asn1.h" 69#endif 70 71int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len) 72{ return M_ASN1_BIT_STRING_set(x, d, len); } 73 74int 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) return(0); 80 81 len=a->length; 82 83 if (len > 0) 84 { 85 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) 86 { 87 bits=(int)a->flags&0x07; 88 } 89 else 90 { 91 for ( ; len > 0; len--) 92 { 93 if (a->data[len-1]) break; 94 } 95 j=a->data[len-1]; 96 if (j & 0x01) bits=0; 97 else if (j & 0x02) bits=1; 98 else if (j & 0x04) bits=2; 99 else if (j & 0x08) bits=3; 100 else if (j & 0x10) bits=4; 101 else if (j & 0x20) bits=5; 102 else if (j & 0x40) bits=6; 103 else if (j & 0x80) bits=7; 104 else bits=0; /* should not happen */ 105 } 106 } 107 else 108 bits=0; 109 110 ret=1+len; 111 if (pp == NULL) return(ret); 112 113 p= *pp; 114 115 *(p++)=(unsigned char)bits; 116 d=a->data; 117 memcpy(p,d,len); 118 p+=len; 119 if (len > 0) p[-1]&=(0xff<<bits); 120 *pp=p; 121 return(ret); 122 } 123 124ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, 125 const unsigned char **pp, long len) 126 { 127 ASN1_BIT_STRING *ret=NULL; 128 const unsigned char *p; 129 unsigned char *s; 130 int i; 131 132 if (len < 1) 133 { 134 i=ASN1_R_STRING_TOO_SHORT; 135 goto err; 136 } 137 138 if ((a == NULL) || ((*a) == NULL)) 139 { 140 if ((ret=M_ASN1_BIT_STRING_new()) == NULL) return(NULL); 141 } 142 else 143 ret=(*a); 144 145 p= *pp; 146 i= *(p++); 147 /* We do this to preserve the settings. If we modify 148 * the settings, via the _set_bit function, we will recalculate 149 * on output */ 150 ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */ 151 ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */ 152 153 if (len-- > 1) /* using one because of the bits left byte */ 154 { 155 s=(unsigned char *)malloc((int)len); 156 if (s == NULL) 157 { 158 /* i=ERR_R_MALLOC_FAILURE; */ 159 i=-1; 160 goto err; 161 } 162 memcpy(s,p,(int)len); 163 s[len-1]&=(0xff<<i); 164 p+=len; 165 } 166 else 167 s=NULL; 168 169 ret->length=(int)len; 170 if (ret->data != NULL) free(ret->data); 171 ret->data=s; 172 ret->type=V_ASN1_BIT_STRING; 173 if (a != NULL) (*a)=ret; 174 *pp=p; 175 return(ret); 176err: 177 /* ASN1err(ASN1_F_C2I_ASN1_BIT_STRING,i); */ 178 if ((ret != NULL) && ((a == NULL) || (*a != ret))) 179 M_ASN1_BIT_STRING_free(ret); 180 return(NULL); 181 } 182 183/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de> 184 */ 185int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) 186 { 187 int w,v,iv; 188 unsigned char *c; 189 190 w=n/8; 191 v=1<<(7-(n&0x07)); 192 iv= ~v; 193 if (!value) v=0; 194 195 if (a == NULL) 196 return 0; 197 198 a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */ 199 200 if ((a->length < (w+1)) || (a->data == NULL)) 201 { 202 if (!value) return(1); /* Don't need to set */ 203 if (a->data == NULL) { 204 c=(unsigned char *)malloc(w+1); 205 } else { 206 /* XXX 207 c=(unsigned char *)realloc_clean(a->data, 208 a->length, 209 w+1); 210 */ 211 c = (unsigned char *)realloc(a->data, w+1); 212 } 213 if (c == NULL) 214 { 215 /* ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT,ERR_R_MALLOC_FAILURE);*/ 216 return 0; 217 } 218 if (w+1-a->length > 0) memset(c+a->length, 0, w+1-a->length); 219 a->data=c; 220 a->length=w+1; 221 } 222 a->data[w]=((a->data[w])&iv)|v; 223 while ((a->length > 0) && (a->data[a->length-1] == 0)) 224 a->length--; 225 return(1); 226 } 227 228int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n) 229 { 230 int w,v; 231 232 w=n/8; 233 v=1<<(7-(n&0x07)); 234 if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL)) 235 return(0); 236 return((a->data[w]&v) != 0); 237 } 238 239