f_int.c revision 68651
1/* crypto/asn1/f_int.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.h> 63 64int i2a_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *a) 65 { 66 int i,n=0; 67 static const char *h="0123456789ABCDEF"; 68 char buf[2]; 69 70 if (a == NULL) return(0); 71 72 if (a->length == 0) 73 { 74 if (BIO_write(bp,"00",2) != 2) goto err; 75 n=2; 76 } 77 else 78 { 79 for (i=0; i<a->length; i++) 80 { 81 if ((i != 0) && (i%35 == 0)) 82 { 83 if (BIO_write(bp,"\\\n",2) != 2) goto err; 84 n+=2; 85 } 86 buf[0]=h[((unsigned char)a->data[i]>>4)&0x0f]; 87 buf[1]=h[((unsigned char)a->data[i] )&0x0f]; 88 if (BIO_write(bp,buf,2) != 2) goto err; 89 n+=2; 90 } 91 } 92 return(n); 93err: 94 return(-1); 95 } 96 97int a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size) 98 { 99 int ret=0; 100 int i,j,k,m,n,again,bufsize; 101 unsigned char *s=NULL,*sp; 102 unsigned char *bufp; 103 int num=0,slen=0,first=1; 104 105 bs->type=V_ASN1_INTEGER; 106 107 bufsize=BIO_gets(bp,buf,size); 108 for (;;) 109 { 110 if (bufsize < 1) goto err_sl; 111 i=bufsize; 112 if (buf[i-1] == '\n') buf[--i]='\0'; 113 if (i == 0) goto err_sl; 114 if (buf[i-1] == '\r') buf[--i]='\0'; 115 if (i == 0) goto err_sl; 116 again=(buf[i-1] == '\\'); 117 118 for (j=0; j<i; j++) 119 { 120#ifndef CHARSET_EBCDIC 121 if (!( ((buf[j] >= '0') && (buf[j] <= '9')) || 122 ((buf[j] >= 'a') && (buf[j] <= 'f')) || 123 ((buf[j] >= 'A') && (buf[j] <= 'F')))) 124#else 125 /* This #ifdef is not strictly necessary, since 126 * the characters A...F a...f 0...9 are contiguous 127 * (yes, even in EBCDIC - but not the whole alphabet). 128 * Nevertheless, isxdigit() is faster. 129 */ 130 if (!isxdigit(buf[j])) 131#endif 132 { 133 i=j; 134 break; 135 } 136 } 137 buf[i]='\0'; 138 /* We have now cleared all the crap off the end of the 139 * line */ 140 if (i < 2) goto err_sl; 141 142 bufp=(unsigned char *)buf; 143 if (first) 144 { 145 first=0; 146 if ((bufp[0] == '0') && (buf[1] == '0')) 147 { 148 bufp+=2; 149 i-=2; 150 } 151 } 152 k=0; 153 i-=again; 154 if (i%2 != 0) 155 { 156 ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_ODD_NUMBER_OF_CHARS); 157 goto err; 158 } 159 i/=2; 160 if (num+i > slen) 161 { 162 if (s == NULL) 163 sp=(unsigned char *)OPENSSL_malloc( 164 (unsigned int)num+i*2); 165 else 166 sp=(unsigned char *)OPENSSL_realloc(s, 167 (unsigned int)num+i*2); 168 if (sp == NULL) 169 { 170 ASN1err(ASN1_F_A2I_ASN1_INTEGER,ERR_R_MALLOC_FAILURE); 171 if (s != NULL) OPENSSL_free(s); 172 goto err; 173 } 174 s=sp; 175 slen=num+i*2; 176 } 177 for (j=0; j<i; j++,k+=2) 178 { 179 for (n=0; n<2; n++) 180 { 181 m=bufp[k+n]; 182 if ((m >= '0') && (m <= '9')) 183 m-='0'; 184 else if ((m >= 'a') && (m <= 'f')) 185 m=m-'a'+10; 186 else if ((m >= 'A') && (m <= 'F')) 187 m=m-'A'+10; 188 else 189 { 190 ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_NON_HEX_CHARACTERS); 191 goto err; 192 } 193 s[num+j]<<=4; 194 s[num+j]|=m; 195 } 196 } 197 num+=i; 198 if (again) 199 bufsize=BIO_gets(bp,buf,size); 200 else 201 break; 202 } 203 bs->length=num; 204 bs->data=s; 205 ret=1; 206err: 207 if (0) 208 { 209err_sl: 210 ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_SHORT_LINE); 211 } 212 return(ret); 213 } 214 215