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