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) 71 return (0); 72 73 if (a->type & V_ASN1_NEG) { 74 if (BIO_write(bp, "-", 1) != 1) 75 goto err; 76 n = 1; 77 } 78 79 if (a->length == 0) { 80 if (BIO_write(bp, "00", 2) != 2) 81 goto err; 82 n += 2; 83 } else { 84 for (i = 0; i < a->length; i++) { 85 if ((i != 0) && (i % 35 == 0)) { 86 if (BIO_write(bp, "\\\n", 2) != 2) 87 goto err; 88 n += 2; 89 } 90 buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f]; 91 buf[1] = h[((unsigned char)a->data[i]) & 0x0f]; 92 if (BIO_write(bp, buf, 2) != 2) 93 goto err; 94 n += 2; 95 } 96 } 97 return (n); 98 err: 99 return (-1); 100} 101 102int a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size) 103{ 104 int ret = 0; 105 int i, j, k, m, n, again, bufsize; 106 unsigned char *s = NULL, *sp; 107 unsigned char *bufp; 108 int num = 0, slen = 0, first = 1; 109 110 bs->type = V_ASN1_INTEGER; 111 112 bufsize = BIO_gets(bp, buf, size); 113 for (;;) { 114 if (bufsize < 1) 115 goto err_sl; 116 i = bufsize; 117 if (buf[i - 1] == '\n') 118 buf[--i] = '\0'; 119 if (i == 0) 120 goto err_sl; 121 if (buf[i - 1] == '\r') 122 buf[--i] = '\0'; 123 if (i == 0) 124 goto err_sl; 125 again = (buf[i - 1] == '\\'); 126 127 for (j = 0; j < i; j++) { 128#ifndef CHARSET_EBCDIC 129 if (!(((buf[j] >= '0') && (buf[j] <= '9')) || 130 ((buf[j] >= 'a') && (buf[j] <= 'f')) || 131 ((buf[j] >= 'A') && (buf[j] <= 'F')))) 132#else 133 /* 134 * This #ifdef is not strictly necessary, since the characters 135 * A...F a...f 0...9 are contiguous (yes, even in EBCDIC - but 136 * not the whole alphabet). Nevertheless, isxdigit() is faster. 137 */ 138 if (!isxdigit(buf[j])) 139#endif 140 { 141 i = j; 142 break; 143 } 144 } 145 buf[i] = '\0'; 146 /* 147 * We have now cleared all the crap off the end of the line 148 */ 149 if (i < 2) 150 goto err_sl; 151 152 bufp = (unsigned char *)buf; 153 if (first) { 154 first = 0; 155 if ((bufp[0] == '0') && (buf[1] == '0')) { 156 bufp += 2; 157 i -= 2; 158 } 159 } 160 k = 0; 161 i -= again; 162 if (i % 2 != 0) { 163 ASN1err(ASN1_F_A2I_ASN1_INTEGER, ASN1_R_ODD_NUMBER_OF_CHARS); 164 goto err; 165 } 166 i /= 2; 167 if (num + i > slen) { 168 if (s == NULL) 169 sp = (unsigned char *)OPENSSL_malloc((unsigned int)num + 170 i * 2); 171 else 172 sp = OPENSSL_realloc_clean(s, slen, num + i * 2); 173 if (sp == NULL) { 174 ASN1err(ASN1_F_A2I_ASN1_INTEGER, ERR_R_MALLOC_FAILURE); 175 goto err; 176 } 177 s = sp; 178 slen = num + i * 2; 179 } 180 for (j = 0; j < i; j++, k += 2) { 181 for (n = 0; n < 2; n++) { 182 m = bufp[k + n]; 183 if ((m >= '0') && (m <= '9')) 184 m -= '0'; 185 else if ((m >= 'a') && (m <= 'f')) 186 m = m - 'a' + 10; 187 else if ((m >= 'A') && (m <= 'F')) 188 m = m - 'A' + 10; 189 else { 190 ASN1err(ASN1_F_A2I_ASN1_INTEGER, 191 ASN1_R_NON_HEX_CHARACTERS); 192 goto err; 193 } 194 s[num + j] <<= 4; 195 s[num + j] |= m; 196 } 197 } 198 num += i; 199 if (again) 200 bufsize = BIO_gets(bp, buf, size); 201 else 202 break; 203 } 204 bs->length = num; 205 bs->data = s; 206 ret = 1; 207 err: 208 if (0) { 209 err_sl: 210 ASN1err(ASN1_F_A2I_ASN1_INTEGER, ASN1_R_SHORT_LINE); 211 } 212 if (ret != 1) 213 OPENSSL_free(s); 214 return (ret); 215} 216