a_bitstr.c revision 55714
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 "cryptlib.h" 61#include <openssl/asn1.h> 62 63int i2d_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) 64 { 65 int ret,j,r,bits,len; 66 unsigned char *p,*d; 67 68 if (a == NULL) return(0); 69 70 len=a->length; 71 72 if (len > 0) 73 { 74 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) 75 { 76 bits=(int)a->flags&0x07; 77 } 78 else 79 { 80 for ( ; len > 0; len--) 81 { 82 if (a->data[len-1]) break; 83 } 84 j=a->data[len-1]; 85 if (j & 0x01) bits=0; 86 else if (j & 0x02) bits=1; 87 else if (j & 0x04) bits=2; 88 else if (j & 0x08) bits=3; 89 else if (j & 0x10) bits=4; 90 else if (j & 0x20) bits=5; 91 else if (j & 0x40) bits=6; 92 else if (j & 0x80) bits=7; 93 else bits=0; /* should not happen */ 94 } 95 } 96 else 97 bits=0; 98 ret=1+len; 99 r=ASN1_object_size(0,ret,V_ASN1_BIT_STRING); 100 if (pp == NULL) return(r); 101 p= *pp; 102 103 ASN1_put_object(&p,0,ret,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL); 104 *(p++)=(unsigned char)bits; 105 d=a->data; 106 memcpy(p,d,len); 107 p+=len; 108 if (len > 0) p[-1]&=(0xff<<bits); 109 *pp=p; 110 return(r); 111 } 112 113ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, unsigned char **pp, 114 long length) 115 { 116 ASN1_BIT_STRING *ret=NULL; 117 unsigned char *p,*s; 118 long len; 119 int inf,tag,xclass; 120 int i; 121 122 if ((a == NULL) || ((*a) == NULL)) 123 { 124 if ((ret=ASN1_BIT_STRING_new()) == NULL) return(NULL); 125 } 126 else 127 ret=(*a); 128 129 p= *pp; 130 inf=ASN1_get_object(&p,&len,&tag,&xclass,length); 131 if (inf & 0x80) 132 { 133 i=ASN1_R_BAD_OBJECT_HEADER; 134 goto err; 135 } 136 137 if (tag != V_ASN1_BIT_STRING) 138 { 139 i=ASN1_R_EXPECTING_A_BIT_STRING; 140 goto err; 141 } 142 if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; } 143 144 i= *(p++); 145 /* We do this to preserve the settings. If we modify 146 * the settings, via the _set_bit function, we will recalculate 147 * on output */ 148 ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */ 149 ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */ 150 151 if (len-- > 1) /* using one because of the bits left byte */ 152 { 153 s=(unsigned char *)Malloc((int)len); 154 if (s == NULL) 155 { 156 i=ERR_R_MALLOC_FAILURE; 157 goto err; 158 } 159 memcpy(s,p,(int)len); 160 s[len-1]&=(0xff<<i); 161 p+=len; 162 } 163 else 164 s=NULL; 165 166 ret->length=(int)len; 167 if (ret->data != NULL) Free((char *)ret->data); 168 ret->data=s; 169 ret->type=V_ASN1_BIT_STRING; 170 if (a != NULL) (*a)=ret; 171 *pp=p; 172 return(ret); 173err: 174 ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i); 175 if ((ret != NULL) && ((a == NULL) || (*a != ret))) 176 ASN1_BIT_STRING_free(ret); 177 return(NULL); 178 } 179 180/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de> 181 */ 182int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) 183 { 184 int w,v,iv; 185 unsigned char *c; 186 187 w=n/8; 188 v=1<<(7-(n&0x07)); 189 iv= ~v; 190 191 a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */ 192 193 if (a == NULL) return(0); 194 if ((a->length < (w+1)) || (a->data == NULL)) 195 { 196 if (!value) return(1); /* Don't need to set */ 197 if (a->data == NULL) 198 c=(unsigned char *)Malloc(w+1); 199 else 200 c=(unsigned char *)Realloc(a->data,w+1); 201 if (c == NULL) return(0); 202 a->data=c; 203 a->length=w+1; 204 c[w]=0; 205 } 206 a->data[w]=((a->data[w])&iv)|v; 207 while ((a->length > 0) && (a->data[a->length-1] == 0)) 208 a->length--; 209 return(1); 210 } 211 212int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n) 213 { 214 int w,v; 215 216 w=n/8; 217 v=1<<(7-(n&0x07)); 218 if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL)) 219 return(0); 220 return((a->data[w]&v) != 0); 221 } 222 223