1 /* crypto/asn1/a_enum.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 /* 64 * Code for ENUMERATED type: identical to INTEGER apart from a different tag. 65 * for comments on encoding see a_int.c 66 */ 67 68 int i2d_ASN1_ENUMERATED(ASN1_ENUMERATED *a, unsigned char **pp) 69 { 70 int pad=0,ret,r,i,t; 71 unsigned char *p,*n,pb=0; 72 73 if ((a == NULL) || (a->data == NULL)) return(0); 74 t=a->type; 75 if (a->length == 0) 76 ret=1; 77 else 78 { 79 ret=a->length; 80 i=a->data[0]; 81 if ((t == V_ASN1_ENUMERATED) && (i > 127)) { 82 pad=1; 83 pb=0; 84 } else if(t == V_ASN1_NEG_ENUMERATED) { 85 if(i>128) { 86 pad=1; 87 pb=0xFF; 88 } else if(i == 128) { 89 for(i = 1; i < a->length; i++) if(a->data[i]) { 90 pad=1; 91 pb=0xFF; 92 break; 93 } 94 } 95 } 96 ret+=pad; 97 } 98 r=ASN1_object_size(0,ret,V_ASN1_ENUMERATED); 99 if (pp == NULL) return(r); 100 p= *pp; 101 102 ASN1_put_object(&p,0,ret,V_ASN1_ENUMERATED,V_ASN1_UNIVERSAL); 103 if (pad) *(p++)=pb; 104 if (a->length == 0) 105 *(p++)=0; 106 else if (t == V_ASN1_ENUMERATED) 107 { 108 memcpy(p,a->data,(unsigned int)a->length); 109 p+=a->length; 110 } 111 else { 112 /* Begin at the end of the encoding */ 113 n=a->data + a->length - 1; 114 p += a->length - 1; 115 i = a->length; 116 /* Copy zeros to destination as long as source is zero */ 117 while(!*n) { 118 *(p--) = 0; 119 n--; 120 i--; 121 } 122 /* Complement and increment next octet */ 123 *(p--) = ((*(n--)) ^ 0xff) + 1; 124 i--; 125 /* Complement any octets left */ 126 for(;i > 0; i--) *(p--) = *(n--) ^ 0xff; 127 p += a->length; 128 } 129 130 *pp=p; 131 return(r); 132 } 133 134 ASN1_ENUMERATED *d2i_ASN1_ENUMERATED(ASN1_ENUMERATED **a, unsigned char **pp, 135 long length) 136 { 137 ASN1_ENUMERATED *ret=NULL; 138 unsigned char *p,*to,*s; 139 long len; 140 int inf,tag,xclass; 141 int i; 142 143 if ((a == NULL) || ((*a) == NULL)) 144 { 145 if ((ret=ASN1_ENUMERATED_new()) == NULL) return(NULL); 146 ret->type=V_ASN1_ENUMERATED; 147 } 148 else 149 ret=(*a); 150 151 p= *pp; 152 inf=ASN1_get_object(&p,&len,&tag,&xclass,length); 153 if (inf & 0x80) 154 { 155 i=ASN1_R_BAD_OBJECT_HEADER; 156 goto err; 157 } 158 159 if (tag != V_ASN1_ENUMERATED) 160 { 161 i=ASN1_R_EXPECTING_AN_ENUMERATED; 162 goto err; 163 } 164 165 /* We must Malloc stuff, even for 0 bytes otherwise it 166 * signifies a missing NULL parameter. */ 167 s=(unsigned char *)Malloc((int)len+1); 168 if (s == NULL) 169 { 170 i=ERR_R_MALLOC_FAILURE; 171 goto err; 172 } 173 to=s; 174 if (*p & 0x80) /* a negative number */ 175 { 176 ret->type=V_ASN1_NEG_ENUMERATED; 177 if ((*p == 0xff) && (len != 1)) { 178 p++; 179 len--; 180 } 181 i = len; 182 p += i - 1; 183 to += i - 1; 184 while((!*p) && i) { 185 *(to--) = 0; 186 i--; 187 p--; 188 } 189 if(!i) { 190 *s = 1; 191 s[len] = 0; 192 p += len; 193 len++; 194 } else { 195 *(to--) = (*(p--) ^ 0xff) + 1; 196 i--; 197 for(;i > 0; i--) *(to--) = *(p--) ^ 0xff; 198 p += len; 199 } 200 } else { 201 ret->type=V_ASN1_ENUMERATED; 202 if ((*p == 0) && (len != 1)) 203 { 204 p++; 205 len--; 206 } 207 memcpy(s,p,(int)len); 208 p+=len; 209 } 210 211 if (ret->data != NULL) Free((char *)ret->data); 212 ret->data=s; 213 ret->length=(int)len; 214 if (a != NULL) (*a)=ret; 215 *pp=p; 216 return(ret); 217 err: 218 ASN1err(ASN1_F_D2I_ASN1_ENUMERATED,i); 219 if ((ret != NULL) && ((a == NULL) || (*a != ret))) 220 ASN1_ENUMERATED_free(ret); 221 return(NULL); 222 } 223 224 int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v) 225 { 226 int i,j,k; 227 unsigned char buf[sizeof(long)+1]; 228 long d; 229 230 a->type=V_ASN1_ENUMERATED; 231 if (a->length < (sizeof(long)+1)) 232 { 233 if (a->data != NULL) 234 Free((char *)a->data); 235 if ((a->data=(unsigned char *)Malloc(sizeof(long)+1)) != NULL) 236 memset((char *)a->data,0,sizeof(long)+1); 237 } 238 if (a->data == NULL) 239 { 240 ASN1err(ASN1_F_ASN1_ENUMERATED_SET,ERR_R_MALLOC_FAILURE); 241 return(0); 242 } 243 d=v; 244 if (d < 0) 245 { 246 d= -d; 247 a->type=V_ASN1_NEG_ENUMERATED; 248 } 249 250 for (i=0; i<sizeof(long); i++) 251 { 252 if (d == 0) break; 253 buf[i]=(int)d&0xff; 254 d>>=8; 255 } 256 j=0; 257 for (k=i-1; k >=0; k--) 258 a->data[j++]=buf[k]; 259 a->length=j; 260 return(1); 261 } 262 263 long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a) 264 { 265 int neg=0,i; 266 long r=0; 267 268 if (a == NULL) return(0L); 269 i=a->type; 270 if (i == V_ASN1_NEG_ENUMERATED) 271 neg=1; 272 else if (i != V_ASN1_ENUMERATED) 273 return(0); 274 275 if (a->length > sizeof(long)) 276 { 277 /* hmm... a bit ugly */ 278 return(0xffffffffL); 279 } 280 if (a->data == NULL) 281 return(0); 282 283 for (i=0; i<a->length; i++) 284 { 285 r<<=8; 286 r|=(unsigned char)a->data[i]; 287 } 288 if (neg) r= -r; 289 return(r); 290 } 291 292 ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai) 293 { 294 ASN1_ENUMERATED *ret; 295 int len,j; 296 297 if (ai == NULL) 298 ret=ASN1_ENUMERATED_new(); 299 else 300 ret=ai; 301 if (ret == NULL) 302 { 303 ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_NESTED_ASN1_ERROR); 304 goto err; 305 } 306 if(bn->neg) ret->type = V_ASN1_NEG_ENUMERATED; 307 else ret->type=V_ASN1_ENUMERATED; 308 j=BN_num_bits(bn); 309 len=((j == 0)?0:((j/8)+1)); 310 ret->data=(unsigned char *)Malloc(len+4); 311 ret->length=BN_bn2bin(bn,ret->data); 312 return(ret); 313 err: 314 if (ret != ai) ASN1_ENUMERATED_free(ret); 315 return(NULL); 316 } 317 318 BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn) 319 { 320 BIGNUM *ret; 321 322 if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL) 323 ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN,ASN1_R_BN_LIB); 324 if(ai->type == V_ASN1_NEG_ENUMERATED) bn->neg = 1; 325 return(ret); 326 } 327