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 69void *ASN1_d2i_fp(void *(*xnew)(void), d2i_of_void *d2i, FILE *in, void **x) 70 { 71 BIO *b; 72 void *ret; 73 74 if ((b=BIO_new(BIO_s_file())) == NULL) 75 { 76 ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB); 77 return(NULL); 78 } 79 BIO_set_fp(b,in,BIO_NOCLOSE); 80 ret=ASN1_d2i_bio(xnew,d2i,b,x); 81 BIO_free(b); 82 return(ret); 83 } 84#endif 85 86void *ASN1_d2i_bio(void *(*xnew)(void), d2i_of_void *d2i, BIO *in, void **x) 87 { 88 BUF_MEM *b = NULL; 89 const unsigned char *p; 90 void *ret=NULL; 91 int len; 92 93 len = asn1_d2i_read_bio(in, &b); 94 if(len < 0) goto err; 95 96 p=(unsigned char *)b->data; 97 ret=d2i(x,&p,len); 98err: 99 if (b != NULL) BUF_MEM_free(b); 100 return(ret); 101 } 102 103#endif 104 105void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x) 106 { 107 BUF_MEM *b = NULL; 108 const unsigned char *p; 109 void *ret=NULL; 110 int len; 111 112 len = asn1_d2i_read_bio(in, &b); 113 if(len < 0) goto err; 114 115 p=(const unsigned char *)b->data; 116 ret=ASN1_item_d2i(x,&p,len, it); 117err: 118 if (b != NULL) BUF_MEM_free(b); 119 return(ret); 120 } 121 122#ifndef OPENSSL_NO_FP_API 123void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x) 124 { 125 BIO *b; 126 char *ret; 127 128 if ((b=BIO_new(BIO_s_file())) == NULL) 129 { 130 ASN1err(ASN1_F_ASN1_ITEM_D2I_FP,ERR_R_BUF_LIB); 131 return(NULL); 132 } 133 BIO_set_fp(b,in,BIO_NOCLOSE); 134 ret=ASN1_item_d2i_bio(it,b,x); 135 BIO_free(b); 136 return(ret); 137 } 138#endif 139 140#define HEADER_SIZE 8 141static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb) 142 { 143 BUF_MEM *b; 144 unsigned char *p; 145 int i; 146 int ret=-1; 147 ASN1_const_CTX c; 148 int want=HEADER_SIZE; 149 int eos=0; 150#if defined(__GNUC__) && defined(__ia64) 151 /* pathetic compiler bug in all known versions as of Nov. 2002 */ 152 long off=0; 153#else 154 int off=0; 155#endif 156 int len=0; 157 158 b=BUF_MEM_new(); 159 if (b == NULL) 160 { 161 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE); 162 return -1; 163 } 164 165 ERR_clear_error(); 166 for (;;) 167 { 168 if (want >= (len-off)) 169 { 170 want-=(len-off); 171 172 if (!BUF_MEM_grow_clean(b,len+want)) 173 { 174 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE); 175 goto err; 176 } 177 i=BIO_read(in,&(b->data[len]),want); 178 if ((i < 0) && ((len-off) == 0)) 179 { 180 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_NOT_ENOUGH_DATA); 181 goto err; 182 } 183 if (i > 0) 184 len+=i; 185 } 186 /* else data already loaded */ 187 188 p=(unsigned char *)&(b->data[off]); 189 c.p=p; 190 c.inf=ASN1_get_object(&(c.p),&(c.slen),&(c.tag),&(c.xclass), 191 len-off); 192 if (c.inf & 0x80) 193 { 194 unsigned long e; 195 196 e=ERR_GET_REASON(ERR_peek_error()); 197 if (e != ASN1_R_TOO_LONG) 198 goto err; 199 else 200 ERR_clear_error(); /* clear error */ 201 } 202 i=c.p-p;/* header length */ 203 off+=i; /* end of data */ 204 205 if (c.inf & 1) 206 { 207 /* no data body so go round again */ 208 eos++; 209 want=HEADER_SIZE; 210 } 211 else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC)) 212 { 213 /* eos value, so go back and read another header */ 214 eos--; 215 if (eos <= 0) 216 break; 217 else 218 want=HEADER_SIZE; 219 } 220 else 221 { 222 /* suck in c.slen bytes of data */ 223 want=(int)c.slen; 224 if (want > (len-off)) 225 { 226 want-=(len-off); 227 if (!BUF_MEM_grow_clean(b,len+want)) 228 { 229 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE); 230 goto err; 231 } 232 while (want > 0) 233 { 234 i=BIO_read(in,&(b->data[len]),want); 235 if (i <= 0) 236 { 237 ASN1err(ASN1_F_ASN1_D2I_READ_BIO, 238 ASN1_R_NOT_ENOUGH_DATA); 239 goto err; 240 } 241 len+=i; 242 want -= i; 243 } 244 } 245 off+=(int)c.slen; 246 if (eos <= 0) 247 { 248 break; 249 } 250 else 251 want=HEADER_SIZE; 252 } 253 } 254 255 *pb = b; 256 return off; 257err: 258 if (b != NULL) BUF_MEM_free(b); 259 return(ret); 260 } 261