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1/* Declarations of functions and data types used for SHA256 and SHA224 sum
2 library functions.
3 Copyright (C) 2005-2006, 2008-2013 Free Software Foundation, Inc.
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18#ifndef ECLAT_SHA256_H
19# define ECLAT_SHA256_H 1
20
21# include <stdio.h>
22# include <stdint.h>
23
24# ifdef __cplusplus
25extern "C" {
26# endif
27
28/* Structure to save state of computation between the single steps. */
29struct sha256_ctx
30{
31 uint32_t state[8];
32
33 uint32_t total[2];
34 size_t buflen;
35 uint32_t buffer[32];
36};
37
38enum { SHA224_DIGEST_SIZE = 224 / 8 };
39enum { SHA256_DIGEST_SIZE = 256 / 8 };
40
41/* Initialize structure containing state of computation. */
42extern void sha256_init_ctx (struct sha256_ctx *ctx);
43extern void sha224_init_ctx (struct sha256_ctx *ctx);
44
45/* Starting with the result of former calls of this function (or the
46 initialization function update the context for the next LEN bytes
47 starting at BUFFER.
48 It is necessary that LEN is a multiple of 64!!! */
49extern void sha256_process_block (const void *buffer, size_t len,
50 struct sha256_ctx *ctx);
51
52/* Starting with the result of former calls of this function (or the
53 initialization function update the context for the next LEN bytes
54 starting at BUFFER.
55 It is NOT required that LEN is a multiple of 64. */
56extern void sha256_process_bytes (const void *buffer, size_t len,
57 struct sha256_ctx *ctx);
58
59/* Process the remaining bytes in the buffer and put result from CTX
60 in first 32 (28) bytes following RESBUF. The result is always in little
61 endian byte order, so that a byte-wise output yields to the wanted
62 ASCII representation of the message digest. */
63extern void *sha256_finish_ctx (struct sha256_ctx *ctx, void *resbuf);
64extern void *sha224_finish_ctx (struct sha256_ctx *ctx, void *resbuf);
65
66
67/* Put result from CTX in first 32 (28) bytes following RESBUF. The result is
68 always in little endian byte order, so that a byte-wise output yields
69 to the wanted ASCII representation of the message digest. */
70extern void *sha256_read_ctx (const struct sha256_ctx *ctx, void *resbuf);
71extern void *sha224_read_ctx (const struct sha256_ctx *ctx, void *resbuf);
72
73
74/* Compute SHA256 (SHA224) message digest for bytes read from STREAM. The
75 resulting message digest number will be written into the 32 (28) bytes
76 beginning at RESBLOCK. */
77extern int sha256_stream (FILE *stream, void *resblock);
78extern int sha224_stream (FILE *stream, void *resblock);
79
80/* Compute SHA256 (SHA224) message digest for LEN bytes beginning at BUFFER. The
81 result is always in little endian byte order, so that a byte-wise
82 output yields to the wanted ASCII representation of the message
83 digest. */
84extern void *sha256_buffer (const char *buffer, size_t len, void *resblock);
85extern void *sha224_buffer (const char *buffer, size_t len, void *resblock);
86
87# ifdef __cplusplus
88}
89# endif
90
91#endif

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