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 64 int 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->type & V_ASN1_NEG) 73 { 74 if (BIO_write(bp, "-", 1) != 1) goto err; 75 n = 1; 76 } 77 78 if (a->length == 0) 79 { 80 if (BIO_write(bp,"00",2) != 2) goto err; 81 n += 2; 82 } 83 else 84 { 85 for (i=0; i<a->length; i++) 86 { 87 if ((i != 0) && (i%35 == 0)) 88 { 89 if (BIO_write(bp,"\\\n",2) != 2) goto err; 90 n+=2; 91 } 92 buf[0]=h[((unsigned char)a->data[i]>>4)&0x0f]; 93 buf[1]=h[((unsigned char)a->data[i] )&0x0f]; 94 if (BIO_write(bp,buf,2) != 2) goto err; 95 n+=2; 96 } 97 } 98 return(n); 99 err: 100 return(-1); 101 } 102 103 int a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size) 104 { 105 int ret=0; 106 int i,j,k,m,n,again,bufsize; 107 unsigned char *s=NULL,*sp; 108 unsigned char *bufp; 109 int num=0,slen=0,first=1; 110 111 bs->type=V_ASN1_INTEGER; 112 113 bufsize=BIO_gets(bp,buf,size); 114 for (;;) 115 { 116 if (bufsize < 1) goto err_sl; 117 i=bufsize; 118 if (buf[i-1] == '\n') buf[--i]='\0'; 119 if (i == 0) goto err_sl; 120 if (buf[i-1] == '\r') buf[--i]='\0'; 121 if (i == 0) goto err_sl; 122 again=(buf[i-1] == '\\'); 123 124 for (j=0; j<i; j++) 125 { 126 #ifndef CHARSET_EBCDIC 127 if (!( ((buf[j] >= '0') && (buf[j] <= '9')) || 128 ((buf[j] >= 'a') && (buf[j] <= 'f')) || 129 ((buf[j] >= 'A') && (buf[j] <= 'F')))) 130 #else 131 /* This #ifdef is not strictly necessary, since 132 * the characters A...F a...f 0...9 are contiguous 133 * (yes, even in EBCDIC - but not the whole alphabet). 134 * Nevertheless, isxdigit() is faster. 135 */ 136 if (!isxdigit(buf[j])) 137 #endif 138 { 139 i=j; 140 break; 141 } 142 } 143 buf[i]='\0'; 144 /* We have now cleared all the crap off the end of the 145 * line */ 146 if (i < 2) goto err_sl; 147 148 bufp=(unsigned char *)buf; 149 if (first) 150 { 151 first=0; 152 if ((bufp[0] == '0') && (buf[1] == '0')) 153 { 154 bufp+=2; 155 i-=2; 156 } 157 } 158 k=0; 159 i-=again; 160 if (i%2 != 0) 161 { 162 ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_ODD_NUMBER_OF_CHARS); 163 goto err; 164 } 165 i/=2; 166 if (num+i > slen) 167 { 168 if (s == NULL) 169 sp=(unsigned char *)OPENSSL_malloc( 170 (unsigned int)num+i*2); 171 else 172 sp=OPENSSL_realloc_clean(s,slen,num+i*2); 173 if (sp == NULL) 174 { 175 ASN1err(ASN1_F_A2I_ASN1_INTEGER,ERR_R_MALLOC_FAILURE); 176 if (s != NULL) OPENSSL_free(s); 177 goto err; 178 } 179 s=sp; 180 slen=num+i*2; 181 } 182 for (j=0; j<i; j++,k+=2) 183 { 184 for (n=0; n<2; n++) 185 { 186 m=bufp[k+n]; 187 if ((m >= '0') && (m <= '9')) 188 m-='0'; 189 else if ((m >= 'a') && (m <= 'f')) 190 m=m-'a'+10; 191 else if ((m >= 'A') && (m <= 'F')) 192 m=m-'A'+10; 193 else 194 { 195 ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_NON_HEX_CHARACTERS); 196 goto err; 197 } 198 s[num+j]<<=4; 199 s[num+j]|=m; 200 } 201 } 202 num+=i; 203 if (again) 204 bufsize=BIO_gets(bp,buf,size); 205 else 206 break; 207 } 208 bs->length=num; 209 bs->data=s; 210 ret=1; 211 err: 212 if (0) 213 { 214 err_sl: 215 ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_SHORT_LINE); 216 } 217 return(ret); 218 } 219 220