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20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
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29 * Copyright 2007 Develer S.r.l. (http://www.develer.com/)
33 * \brief MD2 Message-Digest algorithm.
35 * The algorithm takes as input a message of arbitrary length and produces
36 * as output a 128-bit message digest of the input.
37 * It is conjectured that it is computationally infeasible to produce
38 * two messages having the same message digest, or to produce any
39 * message having a given prespecified target message digest.
44 * \author Daniele Basile <asterix@develer.com>
49 *#* Revision 1.7 2007/02/15 13:29:49 asterix
50 *#* Add MD2_DIGEST_LEN macro.
52 *#* Revision 1.6 2007/02/02 18:15:31 asterix
53 *#* Add function MD2_test. Fix bug in md2_update function.
55 *#* Revision 1.5 2007/02/02 15:37:45 asterix
56 *#* Change md2_end prototype. Remove a unneeded memcpy in md2_end. Add comments.
58 *#* Revision 1.4 2007/01/31 13:53:36 asterix
59 *#* Define COMPUTE_ARRAY_LEN.
61 *#* Revision 1.3 2007/01/31 11:16:48 asterix
62 *#* Defined constants for algorithm compute
64 *#* Revision 1.2 2007/01/30 17:31:44 asterix
65 *#* Add function prototypes.
67 *#* Revision 1.1 2007/01/30 15:53:26 batt
68 *#* Add first md2 skel.
75 #include <cfg/compiler.h>
76 #include <appconfig.h>
78 #define NUM_COMPUTE_ROUNDS 18 ///< Number of compute rounds.
79 #define COMPUTE_ARRAY_LEN CONFIG_MD2_BLOCK_LEN * 3 ///< Lenght of compute array.
80 #define MD2_DIGEST_LEN CONFIG_MD2_BLOCK_LEN
82 * Context for MD2 computation.
84 typedef struct Md2Context
86 uint8_t buffer[CONFIG_MD2_BLOCK_LEN]; ///< Input buffer.
87 uint8_t state[CONFIG_MD2_BLOCK_LEN]; ///< Current state buffer.
88 uint8_t checksum[CONFIG_MD2_BLOCK_LEN]; ///< Checksum.
89 size_t counter; ///< Counter of remaining bytes.
93 void md2_init(Md2Context *context);
94 void md2_update(Md2Context *context, const void *block_in, size_t block_len);
95 uint8_t *md2_end(Md2Context *context);
98 #endif /* ALGOS_MD2_H */