3 * $Id: tiger.c,v 1.1 2000/07/15 10:02:43 mdw Exp $
5 * The Tiger 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 1.1 2000/07/15 10:02:43 mdw
34 * Anderson and Biham's Tiger hash function added.
38 /*----- Header files ------------------------------------------------------*/
40 #include <mLib/bits.h>
42 #include "ghash-def.h"
45 #include "tiger-tab.h"
46 #include "tiger-base.h"
48 /*----- S-boxes -----------------------------------------------------------*/
50 static const kludge64 s
[4][256] = TIGER_S
;
52 /*----- Main code ---------------------------------------------------------*/
54 /* --- @tiger_compress@ --- *
56 * Arguments: @tiger_ctx *ctx@ = pointer to context block
57 * @const void *sbuf@ = pointer to buffer of appropriate size
61 * Use: Tiger compression function.
64 void tiger_compress(tiger_ctx
*ctx
, const void *sbuf
)
69 for (i
= 0, p
= sbuf
; i
< 8; i
++, p
+= 8)
71 TIGER_CORE(ctx
->a
, ctx
->b
, ctx
->c
, x
);
74 /* --- @tiger_init@ --- *
76 * Arguments: @tiger_ctx *ctx@ = pointer to context block to initialize
80 * Use: Initializes a context block ready for hashing.
83 void tiger_init(tiger_ctx
*ctx
)
85 SET64(ctx
->a
, 0x01234567, 0x89abcdef);
86 SET64(ctx
->b
, 0xfedcba98, 0x76543210);
87 SET64(ctx
->c
, 0xf096a5b4, 0xc3b2e187);
89 ctx
->nl
= ctx
->nh
= 0;
92 /* --- @tiger_set@ --- *
94 * Arguments: @tiger_ctx *ctx@ = pointer to context block
95 * @const void *buf@ = pointer to state buffer
96 * @unsigned long count@ = current count of bytes processed
100 * Use: Initializes a context block from a given state. This is
101 * useful in cases where the initial hash state is meant to be
102 * secret, e.g., for NMAC and HMAC support.
105 void tiger_set(tiger_ctx
*ctx
, const void *buf
, unsigned long count
)
107 const octet
*p
= buf
;
108 LOAD64_L_(ctx
->a
, p
+ 0);
109 LOAD64_L_(ctx
->b
, p
+ 8);
110 LOAD64_L_(ctx
->c
, p
+ 16);
112 ctx
->nl
= U32(count
);
113 ctx
->nh
= U32(((count
& ~MASK32
) >> 16) >> 16);
116 /* --- @tiger_hash@ --- *
118 * Arguments: @tiger_ctx *ctx@ = pointer to context block
119 * @const void *buf@ = buffer of data to hash
120 * @size_t sz@ = size of buffer to hash
124 * Use: Hashes a buffer of data. The buffer may be of any size and
128 void tiger_hash(tiger_ctx
*ctx
, const void *buf
, size_t sz
)
130 HASH_BUFFER(TIGER
, tiger
, ctx
, buf
, sz
);
133 /* --- @tiger_done@ --- *
135 * Arguments: @tiger_ctx *ctx@ = pointer to context block
136 * @void *hash@ = pointer to output buffer
140 * Use: Returns the hash of the data read so far.
143 void tiger_done(tiger_ctx
*ctx
, void *hash
)
146 HASH_PAD(TIGER
, tiger
, ctx
, 0x01u
, 0, 8);
147 STORE32_L(ctx
->buf
+ TIGER_BUFSZ
- 8, ctx
->nl
<< 3);
148 STORE32_L(ctx
->buf
+ TIGER_BUFSZ
- 4, (ctx
->nl
>> 29) | (ctx
->nh
<< 3));
149 tiger_compress(ctx
, ctx
->buf
);
150 STORE64_L_(p
+ 0, ctx
->a
);
151 STORE64_L_(p
+ 8, ctx
->b
);
152 STORE64_L_(p
+ 16, ctx
->c
);
155 /* --- @tiger_state@ --- *
157 * Arguments: @tiger_ctx *ctx@ = pointer to context
158 * @void *state@ = pointer to buffer for current state
160 * Returns: Number of bytes written to the hash function so far.
162 * Use: Returns the current state of the hash function such that
163 * it can be passed to @tiger_set@.
166 unsigned long tiger_state(tiger_ctx
*ctx
, void *state
)
169 STORE64_L_(p
+ 0, ctx
->a
);
170 STORE64_L_(p
+ 8, ctx
->b
);
171 STORE64_L_(p
+ 16, ctx
->c
);
172 return (ctx
->nl
| ((ctx
->nh
<< 16) << 16));
175 /* --- Generic interface --- */
177 GHASH_DEF(TIGER
, tiger
)
179 /* --- Test code --- */
181 HASH_TEST(TIGER
, tiger
)
183 /*----- That's all, folks -------------------------------------------------*/