Make sure that bs is not getting free'd again.
[openssl.git] / crypto / asn1 / f_string.c
1 /* crypto/asn1/f_string.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_STRING(BIO *bp, ASN1_STRING *a, int type)
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->length == 0)
73                 {
74                 if (BIO_write(bp,"0",1) != 1) goto err;
75                 n=1;
76                 }
77         else
78                 {
79                 for (i=0; i<a->length; i++)
80                         {
81                         if ((i != 0) && (i%35 == 0))
82                                 {
83                                 if (BIO_write(bp,"\\\n",2) != 2) goto err;
84                                 n+=2;
85                                 }
86                         buf[0]=h[((unsigned char)a->data[i]>>4)&0x0f];
87                         buf[1]=h[((unsigned char)a->data[i]   )&0x0f];
88                         if (BIO_write(bp,buf,2) != 2) goto err;
89                         n+=2;
90                         }
91                 }
92         return(n);
93 err:
94         return(-1);
95         }
96
97 int a2i_ASN1_STRING(BIO *bp, ASN1_STRING *bs, char *buf, int size)
98         {
99         int ret=0;
100         int i,j,k,m,n,again,bufsize;
101         unsigned char *s=NULL,*sp;
102         unsigned char *bufp;
103         int num=0,slen=0,first=1;
104
105         bufsize=BIO_gets(bp,buf,size);
106         for (;;)
107                 {
108                 if (bufsize < 1)
109                         {
110                         if (first)
111                                 break;
112                         else
113                                 goto err_sl;
114                         }
115                 first=0;
116
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=i-1; j>0; 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
150                 k=0;
151                 i-=again;
152                 if (i%2 != 0)
153                         {
154                         ASN1err(ASN1_F_A2I_ASN1_STRING,ASN1_R_ODD_NUMBER_OF_CHARS);
155                         goto err;
156                         }
157                 i/=2;
158                 if (num+i > slen)
159                         {
160                         if (s == NULL)
161                                 sp=(unsigned char *)OPENSSL_malloc(
162                                         (unsigned int)num+i*2);
163                         else
164                                 sp=(unsigned char *)OPENSSL_realloc(s,
165                                         (unsigned int)num+i*2);
166                         if (sp == NULL)
167                                 {
168                                 ASN1err(ASN1_F_A2I_ASN1_STRING,ERR_R_MALLOC_FAILURE);
169                                 if (s != NULL) OPENSSL_free(s);
170                                 goto err;
171                                 }
172                         s=sp;
173                         slen=num+i*2;
174                         }
175                 for (j=0; j<i; j++,k+=2)
176                         {
177                         for (n=0; n<2; n++)
178                                 {
179                                 m=bufp[k+n];
180                                 if ((m >= '0') && (m <= '9'))
181                                         m-='0';
182                                 else if ((m >= 'a') && (m <= 'f'))
183                                         m=m-'a'+10;
184                                 else if ((m >= 'A') && (m <= 'F'))
185                                         m=m-'A'+10;
186                                 else
187                                         {
188                                         ASN1err(ASN1_F_A2I_ASN1_STRING,ASN1_R_NON_HEX_CHARACTERS);
189                                         goto err;
190                                         }
191                                 s[num+j]<<=4;
192                                 s[num+j]|=m;
193                                 }
194                         }
195                 num+=i;
196                 if (again)
197                         bufsize=BIO_gets(bp,buf,size);
198                 else
199                         break;
200                 }
201         bs->length=num;
202         bs->data=s;
203         ret=1;
204 err:
205         if (0)
206                 {
207 err_sl:
208                 ASN1err(ASN1_F_A2I_ASN1_STRING,ASN1_R_SHORT_LINE);
209                 }
210         return(ret);
211         }
212