3 * $Id: sha512.h,v 1.2 2000/10/15 19:09:20 mdw Exp $
5 * Implementation of the SHA-512 hash function
7 * (c) 2000 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
14 * Catacomb is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU Library General Public License as
16 * published by the Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version.
19 * Catacomb is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with Catacomb; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.2 2000/10/15 19:09:20 mdw
34 * Support HMAC mode for hash functions which need to store more state than
35 * the hash output size.
37 * Revision 1.1 2000/10/15 17:48:15 mdw
38 * New SHA variants with longer outputs.
42 /*----- Notes on the SHA-512 hash function ----------------------------------*
44 * SHA-1 (Secure Hash Algorithm) was designed by the NSA, for use with the
45 * Digital Signature Algorithm. This is an evolution with a larger output
46 * size, intended to provide security commensurate with 256-bit AES. At the
47 * time of writing, SHA-512 is very new, and can't be trusted too far. There
48 * is also a truncated version, SHA-384, which provides security commensurate
52 #ifndef CATACOMB_SHA512_H
53 #define CATACOMB_SHA512_H
54 #define CATACOMB_SHA384_H
60 /*----- Header files ------------------------------------------------------*/
62 #include <mLib/bits.h>
64 #ifndef CATACOMB_GHASH_H
68 /*----- Magic numbers -----------------------------------------------------*/
70 #define SHA512_BUFSZ 128
71 #define SHA512_HASHSZ 64
72 #define SHA512_STATESZ 64
74 #define SHA384_BUFSZ 128
75 #define SHA384_HASHSZ 48
76 #define SHA384_STATESZ 64
78 /*----- Data structures ---------------------------------------------------*/
80 typedef struct sha512_ctx
{
81 kludge64 a
, b
, c
, d
, e
, f
, g
, h
; /* Chaining variables */
82 uint32 nh
, nl
; /* Byte count so far */
83 unsigned off
; /* Offset into buffer */
84 octet buf
[SHA512_BUFSZ
]; /* Accumulation buffer */
85 } sha512_ctx
, sha384_ctx
;
87 /*----- Functions provided ------------------------------------------------*/
89 /* --- @sha512_compress@, @sha384_compress@ --- *
91 * Arguments: @sha512_ctx *ctx@ = pointer to context block
92 * @const void *sbuf@ = pointer to buffer of appropriate size
96 * Use: SHA-512 compression function.
99 extern void sha512_compress(sha512_ctx */
*ctx*/
, const void */
*sbuf*/
);
100 #define sha384_compress sha512_compress
102 /* --- @sha512_init@, @sha384_init@ --- *
104 * Arguments: @sha512_ctx *ctx@ = pointer to context block to initialize
108 * Use: Initializes a context block ready for hashing.
111 extern void sha512_init(sha512_ctx */
*ctx*/
);
112 extern void sha384_init(sha512_ctx */
*ctx*/
);
114 /* --- @sha512_set@, @sha384_set@ --- *
116 * Arguments: @sha512_ctx *ctx@ = pointer to context block
117 * @const void *buf@ = pointer to state buffer
118 * @unsigned long count@ = current count of bytes processed
122 * Use: Initializes a context block from a given state. This is
123 * useful in cases where the initial hash state is meant to be
124 * secret, e.g., for NMAC and HMAC support.
127 extern void sha512_set(sha512_ctx */
*ctx*/
, const void */
*buf*/
,
128 unsigned long /*count*/);
129 #define sha384_set sha512_set
131 /* --- @sha512_hash@, @sha384_hash@ --- *
133 * Arguments: @sha512_ctx *ctx@ = pointer to context block
134 * @const void *buf@ = buffer of data to hash
135 * @size_t sz@ = size of buffer to hash
139 * Use: Hashes a buffer of data. The buffer may be of any size and
143 extern void sha512_hash(sha512_ctx */
*ctx*/
,
144 const void */
*buf*/
, size_t /*sz*/);
145 #define sha384_hash sha512_hash
147 /* --- @sha512_done@, @sha384_done@ --- *
149 * Arguments: @sha512_ctx *ctx@ = pointer to context block
150 * @void *hash@ = pointer to output buffer
154 * Use: Returns the hash of the data read so far.
157 extern void sha512_done(sha512_ctx */
*ctx*/
, void */
*hash*/
);
158 extern void sha384_done(sha512_ctx */
*ctx*/
, void */
*hash*/
);
160 /* --- @sha512_state@, @sha384_state@ --- *
162 * Arguments: @sha512_ctx *ctx@ = pointer to context
163 * @void *state@ = pointer to buffer for current state
165 * Returns: Number of bytes written to the hash function so far.
167 * Use: Returns the current state of the hash function such that
168 * it can be passed to @sha512_set@.
171 extern unsigned long sha512_state(sha512_ctx */
*ctx*/
, void */
*state*/
);
172 #define sha384_state sha512_state
174 /*----- Generic hash interface --------------------------------------------*/
176 extern const gchash sha512
;
177 extern const gchash sha384
;
179 /*----- That's all, folks -------------------------------------------------*/