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->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);
99err:
100	return(-1);
101	}
102
103int 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;
211err:
212	if (0)
213		{
214err_sl:
215		ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_SHORT_LINE);
216		}
217	return(ret);
218	}
219
220