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