1/* crypto/asn1/a_d2i_fp.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/buffer.h> 62#include <openssl/asn1_mac.h> 63 64static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb); 65 66#ifndef NO_OLD_ASN1 67#ifndef OPENSSL_NO_FP_API 68 69char *ASN1_d2i_fp(char *(*xnew)(), char *(*d2i)(), FILE *in, 70 unsigned char **x) 71 { 72 BIO *b; 73 char *ret; 74 75 if ((b=BIO_new(BIO_s_file())) == NULL) 76 { 77 ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB); 78 return(NULL); 79 } 80 BIO_set_fp(b,in,BIO_NOCLOSE); 81 ret=ASN1_d2i_bio(xnew,d2i,b,x); 82 BIO_free(b); 83 return(ret); 84 } 85#endif 86 87char *ASN1_d2i_bio(char *(*xnew)(), char *(*d2i)(), BIO *in, 88 unsigned char **x) 89 { 90 BUF_MEM *b = NULL; 91 unsigned char *p; 92 char *ret=NULL; 93 int len; 94 95 len = asn1_d2i_read_bio(in, &b); 96 if(len < 0) goto err; 97 98 p=(unsigned char *)b->data; 99 ret=d2i(x,&p,len); 100err: 101 if (b != NULL) BUF_MEM_free(b); 102 return(ret); 103 } 104 105#endif 106 107void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x) 108 { 109 BUF_MEM *b = NULL; 110 unsigned char *p; 111 void *ret=NULL; 112 int len; 113 114 len = asn1_d2i_read_bio(in, &b); 115 if(len < 0) goto err; 116 117 p=(unsigned char *)b->data; 118 ret=ASN1_item_d2i(x,&p,len, it); 119err: 120 if (b != NULL) BUF_MEM_free(b); 121 return(ret); 122 } 123 124#ifndef OPENSSL_NO_FP_API 125void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x) 126 { 127 BIO *b; 128 char *ret; 129 130 if ((b=BIO_new(BIO_s_file())) == NULL) 131 { 132 ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB); 133 return(NULL); 134 } 135 BIO_set_fp(b,in,BIO_NOCLOSE); 136 ret=ASN1_item_d2i_bio(it,b,x); 137 BIO_free(b); 138 return(ret); 139 } 140#endif 141 142#define HEADER_SIZE 8 143static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb) 144 { 145 BUF_MEM *b; 146 unsigned char *p; 147 int i; 148 int ret=-1; 149 ASN1_CTX c; 150 int want=HEADER_SIZE; 151 int eos=0; 152#if defined(__GNUC__) && defined(__ia64) 153 /* pathetic compiler bug in all known versions as of Nov. 2002 */ 154 long off=0; 155#else 156 int off=0; 157#endif 158 int len=0; 159 160 b=BUF_MEM_new(); 161 if (b == NULL) 162 { 163 ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE); 164 return -1; 165 } 166 167 ERR_clear_error(); 168 for (;;) 169 { 170 if (want >= (len-off)) 171 { 172 want-=(len-off); 173 174 if (!BUF_MEM_grow_clean(b,len+want)) 175 { 176 ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE); 177 goto err; 178 } 179 i=BIO_read(in,&(b->data[len]),want); 180 if ((i < 0) && ((len-off) == 0)) 181 { 182 ASN1err(ASN1_F_ASN1_D2I_BIO,ASN1_R_NOT_ENOUGH_DATA); 183 goto err; 184 } 185 if (i > 0) 186 len+=i; 187 } 188 /* else data already loaded */ 189 190 p=(unsigned char *)&(b->data[off]); 191 c.p=p; 192 c.inf=ASN1_get_object(&(c.p),&(c.slen),&(c.tag),&(c.xclass), 193 len-off); 194 if (c.inf & 0x80) 195 { 196 unsigned long e; 197 198 e=ERR_GET_REASON(ERR_peek_error()); 199 if (e != ASN1_R_TOO_LONG) 200 goto err; 201 else 202 ERR_get_error(); /* clear error */ 203 } 204 i=c.p-p;/* header length */ 205 off+=i; /* end of data */ 206 207 if (c.inf & 1) 208 { 209 /* no data body so go round again */ 210 eos++; 211 want=HEADER_SIZE; 212 } 213 else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC)) 214 { 215 /* eos value, so go back and read another header */ 216 eos--; 217 if (eos <= 0) 218 break; 219 else 220 want=HEADER_SIZE; 221 } 222 else 223 { 224 /* suck in c.slen bytes of data */ 225 want=(int)c.slen; 226 if (want > (len-off)) 227 { 228 want-=(len-off); 229 if (!BUF_MEM_grow_clean(b,len+want)) 230 { 231 ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE); 232 goto err; 233 } 234 while (want > 0) 235 { 236 i=BIO_read(in,&(b->data[len]),want); 237 if (i <= 0) 238 { 239 ASN1err(ASN1_F_ASN1_D2I_BIO, 240 ASN1_R_NOT_ENOUGH_DATA); 241 goto err; 242 } 243 len+=i; 244 want -= i; 245 } 246 } 247 off+=(int)c.slen; 248 if (eos <= 0) 249 { 250 break; 251 } 252 else 253 want=HEADER_SIZE; 254 } 255 } 256 257 *pb = b; 258 return off; 259err: 260 if (b != NULL) BUF_MEM_free(b); 261 return(ret); 262 } 263