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[openssl.git] / crypto / asn1 / f_int.c
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 "buffer.h"
62 #include "x509.h"
63
64 int i2a_ASN1_INTEGER(bp, a)
65 BIO *bp;
66 ASN1_INTEGER *a;
67         {
68         int i,n=0;
69         static 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_INTEGER(bp,bs,buf,size)
100 BIO *bp;
101 ASN1_INTEGER *bs;
102 char *buf;
103 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                         if (!(  ((buf[j] >= '0') && (buf[j] <= '9')) ||
127                                 ((buf[j] >= 'a') && (buf[j] <= 'f')) ||
128                                 ((buf[j] >= 'A') && (buf[j] <= 'F'))))
129                                 {
130                                 i=j;
131                                 break;
132                                 }
133                         }
134                 buf[i]='\0';
135                 /* We have now cleared all the crap off the end of the
136                  * line */
137                 if (i < 2) goto err_sl;
138
139                 bufp=(unsigned char *)buf;
140                 if (first)
141                         {
142                         first=0;
143                         if ((bufp[0] == '0') && (buf[1] == '0'))
144                                 {
145                                 bufp+=2;
146                                 i-=2;
147                                 }
148                         }
149                 k=0;
150                 i-=again;
151                 if (i%2 != 0)
152                         {
153                         ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_ODD_NUMBER_OF_CHARS);
154                         goto err;
155                         }
156                 i/=2;
157                 if (num+i > slen)
158                         {
159                         if (s == NULL)
160                                 sp=(unsigned char *)Malloc(
161                                         (unsigned int)num+i*2);
162                         else
163                                 sp=(unsigned char *)Realloc(s,
164                                         (unsigned int)num+i*2);
165                         if (sp == NULL)
166                                 {
167                                 ASN1err(ASN1_F_A2I_ASN1_INTEGER,ERR_R_MALLOC_FAILURE);
168                                 if (s != NULL) Free((char *)s);
169                                 goto err;
170                                 }
171                         s=sp;
172                         slen=num+i*2;
173                         }
174                 for (j=0; j<i; j++,k+=2)
175                         {
176                         for (n=0; n<2; n++)
177                                 {
178                                 m=bufp[k+n];
179                                 if ((m >= '0') && (m <= '9'))
180                                         m-='0';
181                                 else if ((m >= 'a') && (m <= 'f'))
182                                         m=m-'a'+10;
183                                 else if ((m >= 'A') && (m <= 'F'))
184                                         m=m-'A'+10;
185                                 else
186                                         {
187                                         ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_NON_HEX_CHARACTERS);
188                                         goto err;
189                                         }
190                                 s[num+j]<<=4;
191                                 s[num+j]|=m;
192                                 }
193                         }
194                 num+=i;
195                 if (again)
196                         bufsize=BIO_gets(bp,buf,size);
197                 else
198                         break;
199                 }
200         bs->length=num;
201         bs->data=s;
202         ret=1;
203 err:
204         if (0)
205                 {
206 err_sl:
207                 ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_SHORT_LINE);
208                 }
209         return(ret);
210         }
211