annotate sha1.h @ 4:fd28c7358ce8

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author Matt Johnston <matt@ucc.asn.au>
date Tue, 04 Jun 2013 22:12:01 +0800
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1 /* sha1.h */
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2 /*
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3 This file is part of the AVR-Crypto-Lib.
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4 Copyright (C) 2008 Daniel Otte ([email protected])
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5
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6 This program is free software: you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation, either version 3 of the License, or
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9 (at your option) any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program. If not, see <http://www.gnu.org/licenses/>.
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18 */
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19 /**
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20 * \file sha1.h
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21 * \author Daniel Otte
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22 * \email [email protected]
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23 * \date 2006-10-08
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24 * \license GPLv3 or later
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25 * \brief SHA-1 declaration.
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26 * \ingroup SHA-1
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27 *
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28 */
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29
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30 #ifndef SHA1_H_
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31 #define SHA1_H_
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32
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33 #include <stdint.h>
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34 /** \def SHA1_HASH_BITS
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35 * definees the size of a SHA-1 hash in bits
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36 */
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37
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38 /** \def SHA1_HASH_BYTES
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39 * definees the size of a SHA-1 hash in bytes
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40 */
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41
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42 /** \def SHA1_BLOCK_BITS
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43 * definees the size of a SHA-1 input block in bits
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44 */
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45
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46 /** \def SHA1_BLOCK_BYTES
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47 * definees the size of a SHA-1 input block in bytes
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48 */
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49 #define SHA1_HASH_BITS 160
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50 #define SHA1_HASH_BYTES (SHA1_HASH_BITS/8)
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51 #define SHA1_BLOCK_BITS 512
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52 #define SHA1_BLOCK_BYTES (SHA1_BLOCK_BITS/8)
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53
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54 /** \typedef sha1_ctx_t
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55 * \brief SHA-1 context type
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56 *
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57 * A vatiable of this type may hold the state of a SHA-1 hashing process
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58 */
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59 typedef struct {
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60 uint32_t h[5];
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61 uint64_t length;
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62 } sha1_ctx_t;
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63
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64 /** \typedef sha1_hash_t
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65 * \brief hash value type
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66 * A variable of this type may hold a SHA-1 hash value
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67 */
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68 /*
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69 typedef uint8_t sha1_hash_t[SHA1_HASH_BITS/8];
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70 */
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71
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72 /** \fn sha1_init(sha1_ctx_t *state)
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73 * \brief initializes a SHA-1 context
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74 * This function sets a ::sha1_ctx_t variable to the initialization vector
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75 * for SHA-1 hashing.
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76 * \param state pointer to the SHA-1 context variable
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77 */
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78 void sha1_init(sha1_ctx_t *state);
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79
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80 /** \fn sha1_nextBlock(sha1_ctx_t *state, const void* block)
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81 * \brief process one input block
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82 * This function processes one input block and updates the hash context
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83 * accordingly
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84 * \param state pointer to the state variable to update
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85 * \param block pointer to the message block to process
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86 */
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87 void sha1_nextBlock (sha1_ctx_t *state, const void* block);
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88
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89 /** \fn sha1_lastBlock(sha1_ctx_t *state, const void* block, uint16_t length_b)
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90 * \brief processes the given block and finalizes the context
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91 * This function processes the last block in a SHA-1 hashing process.
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92 * The block should have a maximum length of a single input block.
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93 * \param state pointer to the state variable to update and finalize
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94 * \param block pointer to themessage block to process
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95 * \param length_b length of the message block in bits
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96 */
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97 void sha1_lastBlock (sha1_ctx_t *state, const void* block, uint16_t length_b);
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98
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99 /** \fn sha1_ctx2hash(sha1_hash_t *dest, sha1_ctx_t *state)
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100 * \brief convert a state variable into an actual hash value
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101 * Writes the hash value corresponding to the state to the memory pointed by dest.
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102 * \param dest pointer to the hash value destination
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103 * \param state pointer to the hash context
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104 */
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105 void sha1_ctx2hash (void *dest, sha1_ctx_t *state);
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106
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107 /** \fn sha1(sha1_hash_t *dest, const void* msg, uint32_t length_b)
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108 * \brief hashing a message which in located entirely in RAM
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109 * This function automatically hashes a message which is entirely in RAM with
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110 * the SHA-1 hashing algorithm.
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111 * \param dest pointer to the hash value destination
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112 * \param msg pointer to the message which should be hashed
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113 * \param length_b length of the message in bits
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114 */
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115 void sha1(void *dest, const void* msg, uint32_t length_b);
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116
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117
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118
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119 #endif /*SHA1_H_*/