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1 /*
2 * MD5 password support for CUPS.
3 *
4 * Copyright 2007-2010 by Apple Inc.
5 * Copyright 1997-2005 by Easy Software Products.
6 *
7 * These coded instructions, statements, and computer programs are the
8 * property of Apple Inc. and are protected by Federal copyright
9 * law. Distribution and use rights are outlined in the file "LICENSE.txt"
10 * which should have been included with this file. If this file is
11 * file is missing or damaged, see the license at "http://www.cups.org/".
12 *
13 * This file is subject to the Apple OS-Developed Software exception.
14 */
15
16 /*
17 * Include necessary headers...
18 */
19
20 #include "http-private.h"
21 #include "string-private.h"
22
23
24 /*
25 * 'httpMD5()' - Compute the MD5 sum of the username:group:password.
26 */
27
28 char * /* O - MD5 sum */
29 httpMD5(const char *username, /* I - User name */
30 const char *realm, /* I - Realm name */
31 const char *passwd, /* I - Password string */
32 char md5[33]) /* O - MD5 string */
33 {
34 _cups_md5_state_t state; /* MD5 state info */
35 unsigned char sum[16]; /* Sum data */
36 char line[256]; /* Line to sum */
37
38
39 /*
40 * Compute the MD5 sum of the user name, group name, and password.
41 */
42
43 snprintf(line, sizeof(line), "%s:%s:%s", username, realm, passwd);
44 _cupsMD5Init(&state);
45 _cupsMD5Append(&state, (unsigned char *)line, (int)strlen(line));
46 _cupsMD5Finish(&state, sum);
47
48 /*
49 * Return the sum...
50 */
51
52 return (httpMD5String(sum, md5));
53 }
54
55
56 /*
57 * 'httpMD5Final()' - Combine the MD5 sum of the username, group, and password
58 * with the server-supplied nonce value, method, and
59 * request-uri.
60 */
61
62 char * /* O - New sum */
63 httpMD5Final(const char *nonce, /* I - Server nonce value */
64 const char *method, /* I - METHOD (GET, POST, etc.) */
65 const char *resource, /* I - Resource path */
66 char md5[33]) /* IO - MD5 sum */
67 {
68 _cups_md5_state_t state; /* MD5 state info */
69 unsigned char sum[16]; /* Sum data */
70 char line[1024]; /* Line of data */
71 char a2[33]; /* Hash of method and resource */
72
73
74 /*
75 * First compute the MD5 sum of the method and resource...
76 */
77
78 snprintf(line, sizeof(line), "%s:%s", method, resource);
79 _cupsMD5Init(&state);
80 _cupsMD5Append(&state, (unsigned char *)line, (int)strlen(line));
81 _cupsMD5Finish(&state, sum);
82 httpMD5String(sum, a2);
83
84 /*
85 * Then combine A1 (MD5 of username, realm, and password) with the nonce
86 * and A2 (method + resource) values to get the final MD5 sum for the
87 * request...
88 */
89
90 snprintf(line, sizeof(line), "%s:%s:%s", md5, nonce, a2);
91
92 _cupsMD5Init(&state);
93 _cupsMD5Append(&state, (unsigned char *)line, (int)strlen(line));
94 _cupsMD5Finish(&state, sum);
95
96 return (httpMD5String(sum, md5));
97 }
98
99
100 /*
101 * 'httpMD5String()' - Convert an MD5 sum to a character string.
102 */
103
104 char * /* O - MD5 sum in hex */
105 httpMD5String(const unsigned char *sum, /* I - MD5 sum data */
106 char md5[33])
107 /* O - MD5 sum in hex */
108 {
109 int i; /* Looping var */
110 char *md5ptr; /* Pointer into MD5 string */
111 static const char hex[] = "0123456789abcdef";
112 /* Hex digits */
113
114
115 /*
116 * Convert the MD5 sum to hexadecimal...
117 */
118
119 for (i = 16, md5ptr = md5; i > 0; i --, sum ++)
120 {
121 *md5ptr++ = hex[*sum >> 4];
122 *md5ptr++ = hex[*sum & 15];
123 }
124
125 *md5ptr = '\0';
126
127 return (md5);
128 }