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      1 /* crypto/asn1/f_enum.c */
      2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      3  * All rights reserved.
      4  *
      5  * This package is an SSL implementation written
      6  * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 /* Based on a_int.c: equivalent ENUMERATED functions */
     65 
     66 int i2a_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *a)
     67 	{
     68 	int i,n=0;
     69 	static const char *h="0123456789ABCDEF";
     70 	char buf[2];
     71 
     72 	if (a == NULL) return(0);
     73 
     74 	if (a->length == 0)
     75 		{
     76 		if (BIO_write(bp,"00",2) != 2) goto err;
     77 		n=2;
     78 		}
     79 	else
     80 		{
     81 		for (i=0; i<a->length; i++)
     82 			{
     83 			if ((i != 0) && (i%35 == 0))
     84 				{
     85 				if (BIO_write(bp,"\\\n",2) != 2) goto err;
     86 				n+=2;
     87 				}
     88 			buf[0]=h[((unsigned char)a->data[i]>>4)&0x0f];
     89 			buf[1]=h[((unsigned char)a->data[i]   )&0x0f];
     90 			if (BIO_write(bp,buf,2) != 2) goto err;
     91 			n+=2;
     92 			}
     93 		}
     94 	return(n);
     95 err:
     96 	return(-1);
     97 	}
     98 
     99 int a2i_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *bs, char *buf, int size)
    100 	{
    101 	int ret=0;
    102 	int i,j,k,m,n,again,bufsize;
    103 	unsigned char *s=NULL,*sp;
    104 	unsigned char *bufp;
    105 	int num=0,slen=0,first=1;
    106 
    107 	bs->type=V_ASN1_ENUMERATED;
    108 
    109 	bufsize=BIO_gets(bp,buf,size);
    110 	for (;;)
    111 		{
    112 		if (bufsize < 1) goto err_sl;
    113 		i=bufsize;
    114 		if (buf[i-1] == '\n') buf[--i]='\0';
    115 		if (i == 0) goto err_sl;
    116 		if (buf[i-1] == '\r') buf[--i]='\0';
    117 		if (i == 0) goto err_sl;
    118 		again=(buf[i-1] == '\\');
    119 
    120 		for (j=0; j<i; j++)
    121 			{
    122 			if (!(	((buf[j] >= '0') && (buf[j] <= '9')) ||
    123 				((buf[j] >= 'a') && (buf[j] <= 'f')) ||
    124 				((buf[j] >= 'A') && (buf[j] <= 'F'))))
    125 				{
    126 				i=j;
    127 				break;
    128 				}
    129 			}
    130 		buf[i]='\0';
    131 		/* We have now cleared all the crap off the end of the
    132 		 * line */
    133 		if (i < 2) goto err_sl;
    134 
    135 		bufp=(unsigned char *)buf;
    136 		if (first)
    137 			{
    138 			first=0;
    139 			if ((bufp[0] == '0') && (buf[1] == '0'))
    140 				{
    141 				bufp+=2;
    142 				i-=2;
    143 				}
    144 			}
    145 		k=0;
    146 		i-=again;
    147 		if (i%2 != 0)
    148 			{
    149 			ASN1err(ASN1_F_A2I_ASN1_ENUMERATED,ASN1_R_ODD_NUMBER_OF_CHARS);
    150 			goto err;
    151 			}
    152 		i/=2;
    153 		if (num+i > slen)
    154 			{
    155 			if (s == NULL)
    156 				sp=(unsigned char *)OPENSSL_malloc(
    157 					(unsigned int)num+i*2);
    158 			else
    159 				sp=(unsigned char *)OPENSSL_realloc(s,
    160 					(unsigned int)num+i*2);
    161 			if (sp == NULL)
    162 				{
    163 				ASN1err(ASN1_F_A2I_ASN1_ENUMERATED,ERR_R_MALLOC_FAILURE);
    164 				if (s != NULL) OPENSSL_free(s);
    165 				goto err;
    166 				}
    167 			s=sp;
    168 			slen=num+i*2;
    169 			}
    170 		for (j=0; j<i; j++,k+=2)
    171 			{
    172 			for (n=0; n<2; n++)
    173 				{
    174 				m=bufp[k+n];
    175 				if ((m >= '0') && (m <= '9'))
    176 					m-='0';
    177 				else if ((m >= 'a') && (m <= 'f'))
    178 					m=m-'a'+10;
    179 				else if ((m >= 'A') && (m <= 'F'))
    180 					m=m-'A'+10;
    181 				else
    182 					{
    183 					ASN1err(ASN1_F_A2I_ASN1_ENUMERATED,ASN1_R_NON_HEX_CHARACTERS);
    184 					goto err;
    185 					}
    186 				s[num+j]<<=4;
    187 				s[num+j]|=m;
    188 				}
    189 			}
    190 		num+=i;
    191 		if (again)
    192 			bufsize=BIO_gets(bp,buf,size);
    193 		else
    194 			break;
    195 		}
    196 	bs->length=num;
    197 	bs->data=s;
    198 	ret=1;
    199 err:
    200 	if (0)
    201 		{
    202 err_sl:
    203 		ASN1err(ASN1_F_A2I_ASN1_ENUMERATED,ASN1_R_SHORT_LINE);
    204 		}
    205 	return(ret);
    206 	}
    207 
    208