1 /* Declarations of functions and data types used for SHA512 and SHA384 sum
2 library functions.
3 Copyright (C) 2005-2006, 2008-2023 Free Software Foundation, Inc.
4
5 This file is free software: you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
9
10 This file 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 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17
18 #ifndef SHA512_H
19 # define SHA512_H 1
20
21 # include <stdio.h>
22 # include "u64.h"
23
24 # if HAVE_OPENSSL_SHA512
25 # ifndef OPENSSL_API_COMPAT
26 # define OPENSSL_API_COMPAT 0x10101000L /* FIXME: Use OpenSSL 1.1+ API. */
27 # endif
28 # include <openssl/sha.h>
29 # endif
30
31 # ifdef __cplusplus
32 extern "C" {
33 # endif
34
35 enum { SHA384_DIGEST_SIZE = 384 / 8 };
36 enum { SHA512_DIGEST_SIZE = 512 / 8 };
37
38 # if HAVE_OPENSSL_SHA512
39 # define GL_OPENSSL_NAME 384
40 # include "gl_openssl.h"
41 # define GL_OPENSSL_NAME 512
42 # include "gl_openssl.h"
43 # else
44 /* Structure to save state of computation between the single steps. */
45 struct sha512_ctx
46 {
47 u64 state[8];
48
49 u64 total[2];
50 size_t buflen; /* ≥ 0, ≤ 256 */
51 u64 buffer[32]; /* 256 bytes; the first buflen bytes are in use */
52 };
53
54 /* Initialize structure containing state of computation. */
55 extern void sha512_init_ctx (struct sha512_ctx *ctx);
56 extern void sha384_init_ctx (struct sha512_ctx *ctx);
57
58 /* Starting with the result of former calls of this function (or the
59 initialization function update the context for the next LEN bytes
60 starting at BUFFER.
61 It is necessary that LEN is a multiple of 128!!! */
62 extern void sha512_process_block (const void *buffer, size_t len,
63 struct sha512_ctx *ctx);
64
65 /* Starting with the result of former calls of this function (or the
66 initialization function update the context for the next LEN bytes
67 starting at BUFFER.
68 It is NOT required that LEN is a multiple of 128. */
69 extern void sha512_process_bytes (const void *buffer, size_t len,
70 struct sha512_ctx *ctx);
71
72 /* Process the remaining bytes in the buffer and put result from CTX
73 in first 64 (48) bytes following RESBUF. The result is always in little
74 endian byte order, so that a byte-wise output yields to the wanted
75 ASCII representation of the message digest. */
76 extern void *sha512_finish_ctx (struct sha512_ctx *ctx, void *restrict resbuf);
77 extern void *sha384_finish_ctx (struct sha512_ctx *ctx, void *restrict resbuf);
78
79
80 /* Put result from CTX in first 64 (48) bytes following RESBUF. The result is
81 always in little endian byte order, so that a byte-wise output yields
82 to the wanted ASCII representation of the message digest.
83
84 IMPORTANT: On some systems it is required that RESBUF is correctly
85 aligned for a 32 bits value. */
86 extern void *sha512_read_ctx (const struct sha512_ctx *ctx,
87 void *restrict resbuf);
88 extern void *sha384_read_ctx (const struct sha512_ctx *ctx,
89 void *restrict resbuf);
90
91
92 /* Compute SHA512 (SHA384) message digest for LEN bytes beginning at BUFFER.
93 The result is always in little endian byte order, so that a byte-wise
94 output yields to the wanted ASCII representation of the message
95 digest. */
96 extern void *sha512_buffer (const char *buffer, size_t len,
97 void *restrict resblock);
98 extern void *sha384_buffer (const char *buffer, size_t len,
99 void *restrict resblock);
100
101 # endif
102
103 /* Compute SHA512 (SHA384) message digest for bytes read from STREAM.
104 STREAM is an open file stream. Regular files are handled more efficiently.
105 The contents of STREAM from its current position to its end will be read.
106 The case that the last operation on STREAM was an 'ungetc' is not supported.
107 The resulting message digest number will be written into the 64 (48) bytes
108 beginning at RESBLOCK. */
109 extern int sha512_stream (FILE *stream, void *resblock);
110 extern int sha384_stream (FILE *stream, void *resblock);
111
112
113 # ifdef __cplusplus
114 }
115 # endif
116
117 #endif
118
119 /*
120 * Hey Emacs!
121 * Local Variables:
122 * coding: utf-8
123 * End:
124 */