3 * $Id: md4.c,v 1.4 2004/04/08 01:36:15 mdw Exp $
5 * The MD4 message digest function
7 * (c) 1999 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 /*----- Header files ------------------------------------------------------*/
32 #include <mLib/bits.h>
35 #include "ghash-def.h"
39 /*----- Main code ---------------------------------------------------------*/
41 /* --- @md4_compress@ --- *
43 * Arguments: @md4_ctx *ctx@ = pointer to context block
44 * @const void *sbuf@ = pointer to buffer of appropriate size
48 * Use: RIPEMD-160 compression function.
51 void md4_compress(md4_ctx
*ctx
, const void *sbuf
)
56 /* --- Fetch the chaining variables --- */
63 /* --- Fetch the buffer contents --- */
69 for (i
= 0, p
= sbuf
; i
< 16; i
++, p
+= 4)
73 /* --- Definitions for round functions --- */
75 #define F(x, y, z) (((x) & (y)) | (~(x) & (z)))
76 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
77 #define H(x, y, z) ((x) ^ (y) ^ (z))
79 #define T(w, x, y, z, i, r, k, f) do { \
80 uint32 _t = w + f(x, y, z) + buf[i] + k; \
84 #define FF(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x00000000, F)
85 #define GG(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x5a827999, G)
86 #define HH(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x6ed9eba1, H)
88 /* --- The main compression function --- */
92 FF(c
, d
, a
, b
, 2, 11);
93 FF(b
, c
, d
, a
, 3, 19);
96 FF(c
, d
, a
, b
, 6, 11);
97 FF(b
, c
, d
, a
, 7, 19);
100 FF(c
, d
, a
, b
, 10, 11);
101 FF(b
, c
, d
, a
, 11, 19);
102 FF(a
, b
, c
, d
, 12, 3);
103 FF(d
, a
, b
, c
, 13, 7);
104 FF(c
, d
, a
, b
, 14, 11);
105 FF(b
, c
, d
, a
, 15, 19);
107 GG(a
, b
, c
, d
, 0, 3);
108 GG(d
, a
, b
, c
, 4, 5);
109 GG(c
, d
, a
, b
, 8, 9);
110 GG(b
, c
, d
, a
, 12, 13);
111 GG(a
, b
, c
, d
, 1, 3);
112 GG(d
, a
, b
, c
, 5, 5);
113 GG(c
, d
, a
, b
, 9, 9);
114 GG(b
, c
, d
, a
, 13, 13);
115 GG(a
, b
, c
, d
, 2, 3);
116 GG(d
, a
, b
, c
, 6, 5);
117 GG(c
, d
, a
, b
, 10, 9);
118 GG(b
, c
, d
, a
, 14, 13);
119 GG(a
, b
, c
, d
, 3, 3);
120 GG(d
, a
, b
, c
, 7, 5);
121 GG(c
, d
, a
, b
, 11, 9);
122 GG(b
, c
, d
, a
, 15, 13);
124 HH(a
, b
, c
, d
, 0, 3);
125 HH(d
, a
, b
, c
, 8, 9);
126 HH(c
, d
, a
, b
, 4, 11);
127 HH(b
, c
, d
, a
, 12, 15);
128 HH(a
, b
, c
, d
, 2, 3);
129 HH(d
, a
, b
, c
, 10, 9);
130 HH(c
, d
, a
, b
, 6, 11);
131 HH(b
, c
, d
, a
, 14, 15);
132 HH(a
, b
, c
, d
, 1, 3);
133 HH(d
, a
, b
, c
, 9, 9);
134 HH(c
, d
, a
, b
, 5, 11);
135 HH(b
, c
, d
, a
, 13, 15);
136 HH(a
, b
, c
, d
, 3, 3);
137 HH(d
, a
, b
, c
, 11, 9);
138 HH(c
, d
, a
, b
, 7, 11);
139 HH(b
, c
, d
, a
, 15, 15);
141 /* --- Update the chaining variables --- */
149 /* --- @md4_init@ --- *
151 * Arguments: @md4_ctx *ctx@ = pointer to context block to initialize
155 * Use: Initializes a context block ready for hashing.
158 void md4_init(md4_ctx
*ctx
)
165 ctx
->nl
= ctx
->nh
= 0;
168 /* --- @md4_set@ --- *
170 * Arguments: @md4_ctx *ctx@ = pointer to context block
171 * @const void *buf@ = pointer to state buffer
172 * @unsigned long count@ = current count of bytes processed
176 * Use: Initializes a context block from a given state. This is
177 * useful in cases where the initial hash state is meant to be
178 * secret, e.g., for NMAC and HMAC support.
181 void md4_set(md4_ctx
*ctx
, const void *buf
, unsigned long count
)
183 const octet
*p
= buf
;
184 ctx
->a
= LOAD32_L(p
+ 0);
185 ctx
->b
= LOAD32_L(p
+ 4);
186 ctx
->c
= LOAD32_L(p
+ 8);
187 ctx
->d
= LOAD32_L(p
+ 12);
189 ctx
->nl
= U32(count
);
190 ctx
->nh
= U32(((count
& ~MASK32
) >> 16) >> 16);
193 /* --- @md4_hash@ --- *
195 * Arguments: @md4_ctx *ctx@ = pointer to context block
196 * @const void *buf@ = buffer of data to hash
197 * @size_t sz@ = size of buffer to hash
201 * Use: Hashes a buffer of data. The buffer may be of any size and
205 void md4_hash(md4_ctx
*ctx
, const void *buf
, size_t sz
)
207 HASH_BUFFER(MD4
, md4
, ctx
, buf
, sz
);
210 /* --- @md4_done@ --- *
212 * Arguments: @md4_ctx *ctx@ = pointer to context block
213 * @void *hash@ = pointer to output buffer
217 * Use: Returns the hash of the data read so far.
220 void md4_done(md4_ctx
*ctx
, void *hash
)
223 HASH_MD5STRENGTH(MD4
, md4
, ctx
);
224 STORE32_L(p
+ 0, ctx
->a
);
225 STORE32_L(p
+ 4, ctx
->b
);
226 STORE32_L(p
+ 8, ctx
->c
);
227 STORE32_L(p
+ 12, ctx
->d
);
230 /* --- @md4_state@ --- *
232 * Arguments: @md4_ctx *ctx@ = pointer to context
233 * @void *state@ = pointer to buffer for current state
235 * Returns: Number of bytes written to the hash function so far.
237 * Use: Returns the current state of the hash function such that
238 * it can be passed to @md4_set@.
241 unsigned long md4_state(md4_ctx
*ctx
, void *state
)
244 STORE32_L(p
+ 0, ctx
->a
);
245 STORE32_L(p
+ 4, ctx
->b
);
246 STORE32_L(p
+ 8, ctx
->c
);
247 STORE32_L(p
+ 12, ctx
->d
);
248 return (ctx
->nl
| ((ctx
->nh
>> 16) >> 16));
251 /* --- Generic interface --- */
255 /* --- Test rig --- */
259 /*----- That's all, folks -------------------------------------------------*/