a_bitstr.c revision 100936
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 63ASN1_BIT_STRING *ASN1_BIT_STRING_new(void) 64{ return M_ASN1_BIT_STRING_new(); } 65 66void ASN1_BIT_STRING_free(ASN1_BIT_STRING *x) 67{ M_ASN1_BIT_STRING_free(x); } 68 69int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len) 70{ return M_ASN1_BIT_STRING_set(x, d, len); } 71 72int i2d_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) 73{ 74 int len, ret; 75 len = i2c_ASN1_BIT_STRING(a, NULL); 76 ret=ASN1_object_size(0,len,V_ASN1_BIT_STRING); 77 if(pp) { 78 ASN1_put_object(pp,0,len,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL); 79 i2c_ASN1_BIT_STRING(a, pp); 80 } 81 return ret; 82} 83 84int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) 85 { 86 int ret,j,bits,len; 87 unsigned char *p,*d; 88 89 if (a == NULL) return(0); 90 91 len=a->length; 92 93 if (len > 0) 94 { 95 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) 96 { 97 bits=(int)a->flags&0x07; 98 } 99 else 100 { 101 for ( ; len > 0; len--) 102 { 103 if (a->data[len-1]) break; 104 } 105 j=a->data[len-1]; 106 if (j & 0x01) bits=0; 107 else if (j & 0x02) bits=1; 108 else if (j & 0x04) bits=2; 109 else if (j & 0x08) bits=3; 110 else if (j & 0x10) bits=4; 111 else if (j & 0x20) bits=5; 112 else if (j & 0x40) bits=6; 113 else if (j & 0x80) bits=7; 114 else bits=0; /* should not happen */ 115 } 116 } 117 else 118 bits=0; 119 120 ret=1+len; 121 if (pp == NULL) return(ret); 122 123 p= *pp; 124 125 *(p++)=(unsigned char)bits; 126 d=a->data; 127 memcpy(p,d,len); 128 p+=len; 129 if (len > 0) p[-1]&=(0xff<<bits); 130 *pp=p; 131 return(ret); 132 } 133 134 135/* Convert DER encoded ASN1 BIT_STRING to ASN1_BIT_STRING structure */ 136ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, unsigned char **pp, 137 long length) 138{ 139 unsigned char *p; 140 long len; 141 int i; 142 int inf,tag,xclass; 143 ASN1_BIT_STRING *ret; 144 145 p= *pp; 146 inf=ASN1_get_object(&p,&len,&tag,&xclass,length); 147 if (inf & 0x80) 148 { 149 i=ASN1_R_BAD_OBJECT_HEADER; 150 goto err; 151 } 152 153 if (tag != V_ASN1_BIT_STRING) 154 { 155 i=ASN1_R_EXPECTING_A_BIT_STRING; 156 goto err; 157 } 158 if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; } 159 ret = c2i_ASN1_BIT_STRING(a, &p, len); 160 if(ret) *pp = p; 161 return ret; 162err: 163 ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i); 164 return(NULL); 165 166} 167 168ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, unsigned char **pp, 169 long len) 170 { 171 ASN1_BIT_STRING *ret=NULL; 172 unsigned char *p,*s; 173 int i; 174 175 if ((a == NULL) || ((*a) == NULL)) 176 { 177 if ((ret=M_ASN1_BIT_STRING_new()) == NULL) return(NULL); 178 } 179 else 180 ret=(*a); 181 182 p= *pp; 183 i= *(p++); 184 /* We do this to preserve the settings. If we modify 185 * the settings, via the _set_bit function, we will recalculate 186 * on output */ 187 ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */ 188 ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */ 189 190 if (len-- > 1) /* using one because of the bits left byte */ 191 { 192 s=(unsigned char *)OPENSSL_malloc((int)len); 193 if (s == NULL) 194 { 195 i=ERR_R_MALLOC_FAILURE; 196 goto err; 197 } 198 memcpy(s,p,(int)len); 199 s[len-1]&=(0xff<<i); 200 p+=len; 201 } 202 else 203 s=NULL; 204 205 ret->length=(int)len; 206 if (ret->data != NULL) OPENSSL_free(ret->data); 207 ret->data=s; 208 ret->type=V_ASN1_BIT_STRING; 209 if (a != NULL) (*a)=ret; 210 *pp=p; 211 return(ret); 212err: 213 ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i); 214 if ((ret != NULL) && ((a == NULL) || (*a != ret))) 215 M_ASN1_BIT_STRING_free(ret); 216 return(NULL); 217 } 218 219/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de> 220 */ 221int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) 222 { 223 int w,v,iv; 224 unsigned char *c; 225 226 w=n/8; 227 v=1<<(7-(n&0x07)); 228 iv= ~v; 229 if (!value) v=0; 230 231 a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */ 232 233 if (a == NULL) return(0); 234 if ((a->length < (w+1)) || (a->data == NULL)) 235 { 236 if (!value) return(1); /* Don't need to set */ 237 if (a->data == NULL) 238 c=(unsigned char *)OPENSSL_malloc(w+1); 239 else 240 c=(unsigned char *)OPENSSL_realloc(a->data,w+1); 241 if (c == NULL) return(0); 242 if (w+1-a->length > 0) memset(c+a->length, 0, w+1-a->length); 243 a->data=c; 244 a->length=w+1; 245 } 246 a->data[w]=((a->data[w])&iv)|v; 247 while ((a->length > 0) && (a->data[a->length-1] == 0)) 248 a->length--; 249 return(1); 250 } 251 252int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n) 253 { 254 int w,v; 255 256 w=n/8; 257 v=1<<(7-(n&0x07)); 258 if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL)) 259 return(0); 260 return((a->data[w]&v) != 0); 261 } 262 263