1 /* $OpenBSD: f_enum.c,v 1.16 2018/04/25 11:48:21 tb Exp $ */
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 
61 #include <openssl/asn1.h>
62 #include <openssl/buffer.h>
63 #include <openssl/err.h>
64 
65 /* Based on a_int.c: equivalent ENUMERATED functions */
66 
67 int
i2a_ASN1_ENUMERATED(BIO * bp,const ASN1_ENUMERATED * a)68 i2a_ASN1_ENUMERATED(BIO *bp, const ASN1_ENUMERATED *a)
69 {
70 	int i, n = 0;
71 	static const char h[] = "0123456789ABCDEF";
72 	char buf[2];
73 
74 	if (a == NULL)
75 		return (0);
76 
77 	if (a->length == 0) {
78 		if (BIO_write(bp, "00", 2) != 2)
79 			goto err;
80 		n = 2;
81 	} else {
82 		for (i = 0; i < a->length; i++) {
83 			if ((i != 0) && (i % 35 == 0)) {
84 				if (BIO_write(bp, "\\\n", 2) != 2)
85 					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)
91 				goto err;
92 			n += 2;
93 		}
94 	}
95 	return (n);
96 
97 err:
98 	return (-1);
99 }
100 
101 int
a2i_ASN1_ENUMERATED(BIO * bp,ASN1_ENUMERATED * bs,char * buf,int size)102 a2i_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *bs, char *buf, int size)
103 {
104 	int ret = 0;
105 	int i, j,k, m,n, again, bufsize;
106 	unsigned char *s = NULL, *sp;
107 	unsigned char *bufp;
108 	int first = 1;
109 	size_t num = 0, slen = 0;
110 
111 	bs->type = V_ASN1_ENUMERATED;
112 
113 	bufsize = BIO_gets(bp, buf, size);
114 	for (;;) {
115 		if (bufsize < 1)
116 			goto err_sl;
117 		i = bufsize;
118 		if (buf[i-1] == '\n')
119 			buf[--i] = '\0';
120 		if (i == 0)
121 			goto err_sl;
122 		if (buf[i-1] == '\r')
123 			buf[--i] = '\0';
124 		if (i == 0)
125 			goto err_sl;
126 		again = (buf[i - 1] == '\\');
127 
128 		for (j = 0; j < i; j++) {
129 			if (!(((buf[j] >= '0') && (buf[j] <= '9')) ||
130 			    ((buf[j] >= 'a') && (buf[j] <= 'f')) ||
131 			    ((buf[j] >= 'A') && (buf[j] <= 'F')))) {
132 				i = j;
133 				break;
134 			}
135 		}
136 		buf[i] = '\0';
137 		/* We have now cleared all the crap off the end of the
138 		 * line */
139 		if (i < 2)
140 			goto err_sl;
141 
142 		bufp = (unsigned char *)buf;
143 		if (first) {
144 			first = 0;
145 			if ((bufp[0] == '0') && (buf[1] == '0')) {
146 				bufp += 2;
147 				i -= 2;
148 			}
149 		}
150 		k = 0;
151 		i -= again;
152 		if (i % 2 != 0) {
153 			ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS);
154 			goto err;
155 		}
156 		i /= 2;
157 		if (num + i > slen) {
158 			sp = realloc(s, num + i);
159 			if (sp == NULL) {
160 				ASN1error(ERR_R_MALLOC_FAILURE);
161 				goto err;
162 			}
163 			s = sp;
164 			slen = num + i;
165 		}
166 		for (j = 0; j < i; j++, k += 2) {
167 			for (n = 0; n < 2; n++) {
168 				m = bufp[k + n];
169 				if ((m >= '0') && (m <= '9'))
170 					m -= '0';
171 				else if ((m >= 'a') && (m <= 'f'))
172 					m = m - 'a' + 10;
173 				else if ((m >= 'A') && (m <= 'F'))
174 					m = m - 'A' + 10;
175 				else {
176 					ASN1error(ASN1_R_NON_HEX_CHARACTERS);
177 					goto err;
178 				}
179 				s[num + j] <<= 4;
180 				s[num + j] |= m;
181 			}
182 		}
183 		num += i;
184 		if (again)
185 			bufsize = BIO_gets(bp, buf, size);
186 		else
187 			break;
188 	}
189 	bs->length = num;
190 	bs->data = s;
191 	return (1);
192 
193 err_sl:
194 	ASN1error(ASN1_R_SHORT_LINE);
195 err:
196 	free(s);
197 	return (ret);
198 }
199