4 * @brief Interface of randomizer_t.
9 * Copyright (C) 2005 Jan Hutter, Martin Willi
10 * Hochschule fuer Technik Rapperswil
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
19 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
28 typedef struct randomizer_t randomizer_t
;
31 * @brief Class used to get random and pseudo random values.
33 * This class is thread save as file system read calls are thread save.
40 * @brief Reads a specific number of bytes from random device.
42 * @param this calling randomizer_t object
43 * @param bytes number of bytes to read
44 * @param[out] buffer pointer to buffer where to write the data in.
45 * Size of buffer has to be at least bytes.
48 * - FAILED if random device could not be opened
50 status_t (*get_random_bytes
) (randomizer_t
*this,size_t bytes
, u_int8_t
*buffer
);
53 * @brief Allocates space and writes in random bytes.
55 * @param this calling randomizer_t object
56 * @param bytes number of bytes to allocate
57 * @param[out] chunk chunk which will hold the allocated random bytes
61 * - FAILED if random device could not be opened
63 status_t (*allocate_random_bytes
) (randomizer_t
*this, size_t bytes
, chunk_t
*chunk
);
66 * @brief Reads a specific number of bytes from pseudo random device.
68 * @param this calling randomizer_t object
69 * @param bytes number of bytes to read
70 * @param[out] buffer pointer to buffer where to write the data in.
71 * size of buffer has to be at least bytes.
74 * - FAILED if random device could not be opened
76 status_t (*get_pseudo_random_bytes
) (randomizer_t
*this,size_t bytes
, u_int8_t
*buffer
);
79 * @brief Allocates space and writes in pseudo random bytes.
81 * @param this calling randomizer_t object
82 * @param bytes number of bytes to allocate
83 * @param[out] chunk chunk which will hold the allocated random bytes
87 * - FAILED if random device could not be opened
89 status_t (*allocate_pseudo_random_bytes
) (randomizer_t
*this, size_t bytes
, chunk_t
*chunk
);
92 * @brief Destroys a randomizer_t object.
94 * @param this randomizer_t object to destroy
95 * @return SUCCESS in any case
97 status_t (*destroy
) (randomizer_t
*this);
101 * @brief Creates a randomizer_t object
104 * - created randomizer_t, or
109 randomizer_t
*randomizer_create();
112 * @brief Creates an randomizer_t object with specific random device names.
114 * @param random_dev_name device name for random values, etc /dev/random
115 * @param prandom_dev_name device name for pseudo random values, etc /dev/urandom
117 * - created randomizer_t
118 * - NULL if out of ressources
122 randomizer_t
*randomizer_create_on_devices(char * random_dev_name
,char * prandom_dev_name
);
124 #endif /*RANDOMIZER_H_*/