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3ce9d0d4 LL |
1 | /* Declarations of functions and data types used for SHA256 and SHA224 sum |
2 | library functions. | |
ba318903 | 3 | Copyright (C) 2005-2006, 2008-2014 Free Software Foundation, Inc. |
3ce9d0d4 LL |
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 SHA256_H | |
19 | # define SHA256_H 1 | |
20 | ||
21 | # include <stdio.h> | |
22 | # include <stdint.h> | |
23 | ||
e9551b12 PE |
24 | # if HAVE_OPENSSL_SHA256 |
25 | # include <openssl/sha.h> | |
26 | # endif | |
27 | ||
3ce9d0d4 LL |
28 | # ifdef __cplusplus |
29 | extern "C" { | |
30 | # endif | |
31 | ||
e9551b12 PE |
32 | enum { SHA224_DIGEST_SIZE = 224 / 8 }; |
33 | enum { SHA256_DIGEST_SIZE = 256 / 8 }; | |
34 | ||
35 | # if HAVE_OPENSSL_SHA256 | |
36 | # define GL_OPENSSL_NAME 224 | |
37 | # include "gl_openssl.h" | |
38 | # define GL_OPENSSL_NAME 256 | |
39 | # include "gl_openssl.h" | |
40 | # else | |
3ce9d0d4 LL |
41 | /* Structure to save state of computation between the single steps. */ |
42 | struct sha256_ctx | |
43 | { | |
44 | uint32_t state[8]; | |
45 | ||
46 | uint32_t total[2]; | |
47 | size_t buflen; | |
48 | uint32_t buffer[32]; | |
49 | }; | |
50 | ||
3ce9d0d4 LL |
51 | /* Initialize structure containing state of computation. */ |
52 | extern void sha256_init_ctx (struct sha256_ctx *ctx); | |
53 | extern void sha224_init_ctx (struct sha256_ctx *ctx); | |
54 | ||
55 | /* Starting with the result of former calls of this function (or the | |
56 | initialization function update the context for the next LEN bytes | |
57 | starting at BUFFER. | |
58 | It is necessary that LEN is a multiple of 64!!! */ | |
59 | extern void sha256_process_block (const void *buffer, size_t len, | |
60 | struct sha256_ctx *ctx); | |
61 | ||
62 | /* Starting with the result of former calls of this function (or the | |
63 | initialization function update the context for the next LEN bytes | |
64 | starting at BUFFER. | |
65 | It is NOT required that LEN is a multiple of 64. */ | |
66 | extern void sha256_process_bytes (const void *buffer, size_t len, | |
67 | struct sha256_ctx *ctx); | |
68 | ||
69 | /* Process the remaining bytes in the buffer and put result from CTX | |
70 | in first 32 (28) bytes following RESBUF. The result is always in little | |
71 | endian byte order, so that a byte-wise output yields to the wanted | |
72 | ASCII representation of the message digest. */ | |
73 | extern void *sha256_finish_ctx (struct sha256_ctx *ctx, void *resbuf); | |
74 | extern void *sha224_finish_ctx (struct sha256_ctx *ctx, void *resbuf); | |
75 | ||
76 | ||
77 | /* Put result from CTX in first 32 (28) bytes following RESBUF. The result is | |
78 | always in little endian byte order, so that a byte-wise output yields | |
79 | to the wanted ASCII representation of the message digest. */ | |
80 | extern void *sha256_read_ctx (const struct sha256_ctx *ctx, void *resbuf); | |
81 | extern void *sha224_read_ctx (const struct sha256_ctx *ctx, void *resbuf); | |
82 | ||
83 | ||
3ce9d0d4 LL |
84 | /* Compute SHA256 (SHA224) message digest for LEN bytes beginning at BUFFER. The |
85 | result is always in little endian byte order, so that a byte-wise | |
86 | output yields to the wanted ASCII representation of the message | |
87 | digest. */ | |
88 | extern void *sha256_buffer (const char *buffer, size_t len, void *resblock); | |
89 | extern void *sha224_buffer (const char *buffer, size_t len, void *resblock); | |
90 | ||
e9551b12 PE |
91 | # endif |
92 | /* Compute SHA256 (SHA224) message digest for bytes read from STREAM. The | |
93 | resulting message digest number will be written into the 32 (28) bytes | |
94 | beginning at RESBLOCK. */ | |
95 | extern int sha256_stream (FILE *stream, void *resblock); | |
96 | extern int sha224_stream (FILE *stream, void *resblock); | |
97 | ||
98 | ||
3ce9d0d4 LL |
99 | # ifdef __cplusplus |
100 | } | |
101 | # endif | |
102 | ||
103 | #endif |