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