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1 /* | |
2 * rand_source.h | |
3 * | |
4 * implements a random source based on /dev/random | |
5 * | |
6 * David A. McGrew | |
7 * Cisco Systems, Inc. | |
8 */ | |
9 /* | |
10 * | |
11 * Copyright(c) 2001-2006 Cisco Systems, Inc. | |
12 * All rights reserved. | |
13 * | |
14 * Redistribution and use in source and binary forms, with or without | |
15 * modification, are permitted provided that the following conditions | |
16 * are met: | |
17 * | |
18 * Redistributions of source code must retain the above copyright | |
19 * notice, this list of conditions and the following disclaimer. | |
20 * | |
21 * Redistributions in binary form must reproduce the above | |
22 * copyright notice, this list of conditions and the following | |
23 * disclaimer in the documentation and/or other materials provided | |
24 * with the distribution. | |
25 * | |
26 * Neither the name of the Cisco Systems, Inc. nor the names of its | |
27 * contributors may be used to endorse or promote products derived | |
28 * from this software without specific prior written permission. | |
29 * | |
30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
31 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
32 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
33 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
34 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, | |
35 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
36 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
37 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
41 * OF THE POSSIBILITY OF SUCH DAMAGE. | |
42 * | |
43 */ | |
44 | |
45 | |
46 #ifndef RAND_SOURCE | |
47 #define RAND_SOURCE | |
48 | |
49 #include "err.h" | |
50 #include "datatypes.h" | |
51 | |
52 err_status_t | |
53 rand_source_init(void); | |
54 | |
55 /* | |
56 * rand_source_get_octet_string() writes a random octet string. | |
57 * | |
58 * The function call rand_source_get_octet_string(dest, len) writes | |
59 * len octets of random data to the location to which dest points, | |
60 * and returns an error code. This error code should be checked, | |
61 * and if a failure is reported, the data in the buffer MUST NOT | |
62 * be used. | |
63 * | |
64 * warning: If the return code is not checked, then non-random | |
65 * data may inadvertently be used. | |
66 * | |
67 * returns: | |
68 * - err_status_ok if no problems occured. | |
69 * - [other] a problem occured, and no assumptions should | |
70 * be made about the contents of the destination | |
71 * buffer. | |
72 */ | |
73 | |
74 err_status_t | |
75 rand_source_get_octet_string(void *dest, uint32_t length); | |
76 | |
77 err_status_t | |
78 rand_source_deinit(void); | |
79 | |
80 /* | |
81 * function prototype for a random source function | |
82 * | |
83 * A rand_source_func_t writes num_octets at the location indicated by | |
84 * dest and returns err_status_ok. Any other return value indicates | |
85 * failure. | |
86 */ | |
87 | |
88 typedef err_status_t (*rand_source_func_t) | |
89 (void *dest, uint32_t num_octets); | |
90 | |
91 #endif /* RAND_SOURCE */ | |
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