1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <sys/types.h>
27 #include <errno.h>
28 #include <ctype.h>
29
30 #include <cryptoutil.h>
31
32 /*
33 * tohexstr
34 * IN bytes
35 * blen
36 * hexlen should be 2 * blen + 1
37 * OUT
38 * hexstr
39 */
40 void
tohexstr(uchar_t * bytes,size_t blen,char * hexstr,size_t hexlen)41 tohexstr(uchar_t *bytes, size_t blen, char *hexstr, size_t hexlen)
42 {
43 size_t i;
44 char hexlist[] = "0123456789abcdef";
45
46 for (i = 0; i < blen; i++) {
47 if (hexlen < (2 * i + 1))
48 break;
49 hexstr[2 * i] = hexlist[(bytes[i] >> 4) & 0xf];
50 hexstr[2 * i + 1] = hexlist[bytes[i] & 0xf];
51 }
52 hexstr[2 * blen] = '\0';
53 }
54
55 /*
56 * This function takes a char[] and length of hexadecimal values and
57 * returns a malloc'ed byte array with the length of that new byte array.
58 * The caller needs to provide a pointer to where this new malloc'ed byte array
59 * will be passed back; as well as, a pointer for the length of the new
60 * byte array.
61 *
62 * The caller is responsible for freeing the malloc'ed array when done
63 *
64 * The return code is 0 if successful, otherwise the errno value is returned.
65 */
66 int
hexstr_to_bytes(char * hexstr,size_t hexlen,uchar_t ** bytes,size_t * blen)67 hexstr_to_bytes(char *hexstr, size_t hexlen, uchar_t **bytes, size_t *blen)
68 {
69 int i, ret = 0;
70 unsigned char ch;
71 uchar_t *b = NULL;
72
73 *bytes = NULL;
74 *blen = 0;
75
76 if (hexstr == NULL || (hexlen % 2 == 1))
77 return (EINVAL);
78
79 if (hexstr[0] == '0' && ((hexstr[1] == 'x') || (hexstr[1] == 'X'))) {
80 hexstr += 2;
81 hexlen -= 2;
82 }
83
84 *blen = (hexlen / 2);
85
86 b = malloc(*blen);
87 if (b == NULL) {
88 *blen = 0;
89 return (errno);
90 }
91
92 for (i = 0; i < hexlen; i++) {
93 ch = (unsigned char) *hexstr;
94
95 if (!isxdigit(ch)) {
96 ret = EINVAL;
97 goto out;
98 }
99
100 hexstr++;
101
102 if ((ch >= '0') && (ch <= '9'))
103 ch -= '0';
104 else if ((ch >= 'A') && (ch <= 'F'))
105 ch = ch - 'A' + 10;
106 else if ((ch >= 'a') && (ch <= 'f'))
107 ch = ch - 'a' + 10;
108
109 if (i & 1)
110 b[i/2] |= ch;
111 else
112 b[i/2] = (ch << 4);
113 }
114
115 out:
116 if (b != NULL && ret != 0) {
117 free(b);
118 *blen = 0;
119 } else
120 *bytes = b;
121
122 return (ret);
123 }
124