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1/**
2 * \file mbedtls_sha256.h
3 *
4 * \brief SHA-224 and SHA-256 cryptographic hash function
5 *
6 * Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
7 *
8 * This file is part of mbed TLS (https://tls.mbed.org)
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 */
24#ifndef MBEDTLS_SHA256_H
25#define MBEDTLS_SHA256_H
26
27#if !defined(MBEDTLS_CONFIG_FILE)
28#include "config.h"
29#else
30#include MBEDTLS_CONFIG_FILE
31#endif
32
33#include <stddef.h>
34#include <stdint.h>
35
36#if !defined(MBEDTLS_SHA256_ALT)
37// Regular implementation
38//
39
40#ifdef __cplusplus
41extern "C" {
42#endif
43
44/**
45 * \brief SHA-256 context structure
46 */
47typedef struct
48{
49 uint32_t total[2]; /*!< number of bytes processed */
50 uint32_t state[8]; /*!< intermediate digest state */
51 unsigned char buffer[64]; /*!< data block being processed */
52 int is224; /*!< 0 => SHA-256, else SHA-224 */
53}
54mbedtls_sha256_context;
55
56/**
57 * \brief Initialize SHA-256 context
58 *
59 * \param ctx SHA-256 context to be initialized
60 */
61void mbedtls_sha256_init( mbedtls_sha256_context *ctx );
62
63/**
64 * \brief Clear SHA-256 context
65 *
66 * \param ctx SHA-256 context to be cleared
67 */
68void mbedtls_sha256_free( mbedtls_sha256_context *ctx );
69
70/**
71 * \brief Clone (the state of) a SHA-256 context
72 *
73 * \param dst The destination context
74 * \param src The context to be cloned
75 */
76void mbedtls_sha256_clone( mbedtls_sha256_context *dst,
77 const mbedtls_sha256_context *src );
78
79/**
80 * \brief SHA-256 context setup
81 *
82 * \param ctx context to be initialized
83 * \param is224 0 = use SHA256, 1 = use SHA224
84 */
85void mbedtls_sha256_starts( mbedtls_sha256_context *ctx, int is224 );
86
87/**
88 * \brief SHA-256 process buffer
89 *
90 * \param ctx SHA-256 context
91 * \param input buffer holding the data
92 * \param ilen length of the input data
93 */
94void mbedtls_sha256_update( mbedtls_sha256_context *ctx, const unsigned char *input,
95 size_t ilen );
96
97/**
98 * \brief SHA-256 final digest
99 *
100 * \param ctx SHA-256 context
101 * \param output SHA-224/256 checksum result
102 */
103void mbedtls_sha256_finish( mbedtls_sha256_context *ctx, unsigned char output[32] );
104
105/* Internal use */
106void mbedtls_sha256_process( mbedtls_sha256_context *ctx, const unsigned char data[64] );
107
108#ifdef __cplusplus
109}
110#endif
111
112#else /* MBEDTLS_SHA256_ALT */
113#include "sha256_alt.h"
114#endif /* MBEDTLS_SHA256_ALT */
115
116#ifdef __cplusplus
117extern "C" {
118#endif
119
120/**
121 * \brief Output = SHA-256( input buffer )
122 *
123 * \param input buffer holding the data
124 * \param ilen length of the input data
125 * \param output SHA-224/256 checksum result
126 * \param is224 0 = use SHA256, 1 = use SHA224
127 */
128void mbedtls_sha256( const unsigned char *input, size_t ilen,
129 unsigned char output[32], int is224 );
130
131/**
132 * \brief Checkup routine
133 *
134 * \return 0 if successful, or 1 if the test failed
135 */
136int mbedtls_sha256_self_test( int verbose );
137
138#ifdef __cplusplus
139}
140#endif
141
142#endif /* mbedtls_sha256.h */
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