3 * The Tiger hash function
5 * (c) 2000 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Catacomb.
12 * Catacomb is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Library General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
17 * Catacomb is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Library General Public License for more details.
22 * You should have received a copy of the GNU Library General Public
23 * License along with Catacomb; if not, write to the Free
24 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
28 /*----- Header files ------------------------------------------------------*/
30 #include <mLib/bits.h>
32 #include "ghash-def.h"
35 #include "tiger-base.h"
37 /*----- S-boxes -----------------------------------------------------------*/
39 extern const kludge64 tiger_s
[4][256];
41 /*----- Main code ---------------------------------------------------------*/
43 /* --- @tiger_compress@ --- *
45 * Arguments: @tiger_ctx *ctx@ = pointer to context block
46 * @const void *sbuf@ = pointer to buffer of appropriate size
50 * Use: Tiger compression function.
53 void tiger_compress(tiger_ctx
*ctx
, const void *sbuf
)
58 for (i
= 0, p
= sbuf
; i
< 8; i
++, p
+= 8)
60 TIGER_CORE(ctx
->a
, ctx
->b
, ctx
->c
, x
);
63 /* --- @tiger_init@ --- *
65 * Arguments: @tiger_ctx *ctx@ = pointer to context block to initialize
69 * Use: Initializes a context block ready for hashing.
72 void tiger_init(tiger_ctx
*ctx
)
74 SET64(ctx
->a
, 0x01234567, 0x89abcdef);
75 SET64(ctx
->b
, 0xfedcba98, 0x76543210);
76 SET64(ctx
->c
, 0xf096a5b4, 0xc3b2e187);
78 ctx
->nl
= ctx
->nh
= 0;
81 /* --- @tiger_set@ --- *
83 * Arguments: @tiger_ctx *ctx@ = pointer to context block
84 * @const void *buf@ = pointer to state buffer
85 * @unsigned long count@ = current count of bytes processed
89 * Use: Initializes a context block from a given state. This is
90 * useful in cases where the initial hash state is meant to be
91 * secret, e.g., for NMAC and HMAC support.
94 void tiger_set(tiger_ctx
*ctx
, const void *buf
, unsigned long count
)
97 LOAD64_L_(ctx
->a
, p
+ 0);
98 LOAD64_L_(ctx
->b
, p
+ 8);
99 LOAD64_L_(ctx
->c
, p
+ 16);
101 ctx
->nl
= U32(count
);
102 ctx
->nh
= U32(((count
& ~MASK32
) >> 16) >> 16);
105 /* --- @tiger_hash@ --- *
107 * Arguments: @tiger_ctx *ctx@ = pointer to context block
108 * @const void *buf@ = buffer of data to hash
109 * @size_t sz@ = size of buffer to hash
113 * Use: Hashes a buffer of data. The buffer may be of any size and
117 void tiger_hash(tiger_ctx
*ctx
, const void *buf
, size_t sz
)
119 HASH_BUFFER(TIGER
, tiger
, ctx
, buf
, sz
);
122 /* --- @tiger_done@ --- *
124 * Arguments: @tiger_ctx *ctx@ = pointer to context block
125 * @void *hash@ = pointer to output buffer
129 * Use: Returns the hash of the data read so far.
132 void tiger_done(tiger_ctx
*ctx
, void *hash
)
135 HASH_PAD(TIGER
, tiger
, ctx
, 0x01u
, 0, 8);
136 STORE32_L(ctx
->buf
+ TIGER_BUFSZ
- 8, ctx
->nl
<< 3);
137 STORE32_L(ctx
->buf
+ TIGER_BUFSZ
- 4, (ctx
->nl
>> 29) | (ctx
->nh
<< 3));
138 tiger_compress(ctx
, ctx
->buf
);
139 STORE64_L_(p
+ 0, ctx
->a
);
140 STORE64_L_(p
+ 8, ctx
->b
);
141 STORE64_L_(p
+ 16, ctx
->c
);
144 /* --- @tiger_state@ --- *
146 * Arguments: @tiger_ctx *ctx@ = pointer to context
147 * @void *state@ = pointer to buffer for current state
149 * Returns: Number of bytes written to the hash function so far.
151 * Use: Returns the current state of the hash function such that
152 * it can be passed to @tiger_set@.
155 unsigned long tiger_state(tiger_ctx
*ctx
, void *state
)
158 STORE64_L_(p
+ 0, ctx
->a
);
159 STORE64_L_(p
+ 8, ctx
->b
);
160 STORE64_L_(p
+ 16, ctx
->c
);
161 return (ctx
->nl
| ((ctx
->nh
<< 16) << 16));
164 /* --- Generic interface --- */
166 GHASH_DEF(TIGER
, tiger
)
168 /* --- Test code --- */
170 HASH_TEST(TIGER
, tiger
)
172 /*----- That's all, folks -------------------------------------------------*/