3 * $Id: md4.c,v 1.2 1999/12/10 23:20:03 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 /*----- Revision history --------------------------------------------------*
33 * Revision 1.2 1999/12/10 23:20:03 mdw
34 * New hash interface requirements.
36 * Revision 1.1 1999/09/03 08:41:12 mdw
41 /*----- Header files ------------------------------------------------------*/
43 #include <mLib/bits.h>
46 #include "ghash-def.h"
50 /*----- Main code ---------------------------------------------------------*/
52 /* --- @md4_compress@ --- *
54 * Arguments: @md4_ctx *ctx@ = pointer to context block
55 * @const void *sbuf@ = pointer to buffer of appropriate size
59 * Use: RIPEMD-160 compression function.
62 void md4_compress(md4_ctx
*ctx
, const void *sbuf
)
67 /* --- Fetch the chaining variables --- */
74 /* --- Fetch the buffer contents --- */
80 for (i
= 0, p
= sbuf
; i
< 16; i
++, p
+= 4)
84 /* --- Definitions for round functions --- */
86 #define F(x, y, z) (((x) & (y)) | (~(x) & (z)))
87 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
88 #define H(x, y, z) ((x) ^ (y) ^ (z))
90 #define T(w, x, y, z, i, r, k, f) do { \
91 uint32 _t = w + f(x, y, z) + buf[i] + k; \
95 #define FF(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x00000000, F)
96 #define GG(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x5a827999, G)
97 #define HH(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x6ed9eba1, H)
99 /* --- The main compression function --- */
101 FF(a
, b
, c
, d
, 0, 3);
102 FF(d
, a
, b
, c
, 1, 7);
103 FF(c
, d
, a
, b
, 2, 11);
104 FF(b
, c
, d
, a
, 3, 19);
105 FF(a
, b
, c
, d
, 4, 3);
106 FF(d
, a
, b
, c
, 5, 7);
107 FF(c
, d
, a
, b
, 6, 11);
108 FF(b
, c
, d
, a
, 7, 19);
109 FF(a
, b
, c
, d
, 8, 3);
110 FF(d
, a
, b
, c
, 9, 7);
111 FF(c
, d
, a
, b
, 10, 11);
112 FF(b
, c
, d
, a
, 11, 19);
113 FF(a
, b
, c
, d
, 12, 3);
114 FF(d
, a
, b
, c
, 13, 7);
115 FF(c
, d
, a
, b
, 14, 11);
116 FF(b
, c
, d
, a
, 15, 19);
118 GG(a
, b
, c
, d
, 0, 3);
119 GG(d
, a
, b
, c
, 4, 5);
120 GG(c
, d
, a
, b
, 8, 9);
121 GG(b
, c
, d
, a
, 12, 13);
122 GG(a
, b
, c
, d
, 1, 3);
123 GG(d
, a
, b
, c
, 5, 5);
124 GG(c
, d
, a
, b
, 9, 9);
125 GG(b
, c
, d
, a
, 13, 13);
126 GG(a
, b
, c
, d
, 2, 3);
127 GG(d
, a
, b
, c
, 6, 5);
128 GG(c
, d
, a
, b
, 10, 9);
129 GG(b
, c
, d
, a
, 14, 13);
130 GG(a
, b
, c
, d
, 3, 3);
131 GG(d
, a
, b
, c
, 7, 5);
132 GG(c
, d
, a
, b
, 11, 9);
133 GG(b
, c
, d
, a
, 15, 13);
135 HH(a
, b
, c
, d
, 0, 3);
136 HH(d
, a
, b
, c
, 8, 9);
137 HH(c
, d
, a
, b
, 4, 11);
138 HH(b
, c
, d
, a
, 12, 15);
139 HH(a
, b
, c
, d
, 2, 3);
140 HH(d
, a
, b
, c
, 10, 9);
141 HH(c
, d
, a
, b
, 6, 11);
142 HH(b
, c
, d
, a
, 14, 15);
143 HH(a
, b
, c
, d
, 1, 3);
144 HH(d
, a
, b
, c
, 9, 9);
145 HH(c
, d
, a
, b
, 5, 11);
146 HH(b
, c
, d
, a
, 13, 15);
147 HH(a
, b
, c
, d
, 3, 3);
148 HH(d
, a
, b
, c
, 11, 9);
149 HH(c
, d
, a
, b
, 7, 11);
150 HH(b
, c
, d
, a
, 15, 15);
152 /* --- Update the chaining variables --- */
160 /* --- @md4_init@ --- *
162 * Arguments: @md4_ctx *ctx@ = pointer to context block to initialize
166 * Use: Initializes a context block ready for hashing.
169 void md4_init(md4_ctx
*ctx
)
176 ctx
->nl
= ctx
->nh
= 0;
179 /* --- @md4_set@ --- *
181 * Arguments: @md4_ctx *ctx@ = pointer to context block
182 * @const void *buf@ = pointer to state buffer
183 * @unsigned long count@ = current count of bytes processed
187 * Use: Initializes a context block from a given state. This is
188 * useful in cases where the initial hash state is meant to be
189 * secret, e.g., for NMAC and HMAC support.
192 void md4_set(md4_ctx
*ctx
, const void *buf
, unsigned long count
)
194 const octet
*p
= buf
;
195 ctx
->a
= LOAD32_L(p
+ 0);
196 ctx
->b
= LOAD32_L(p
+ 4);
197 ctx
->c
= LOAD32_L(p
+ 8);
198 ctx
->d
= LOAD32_L(p
+ 12);
200 ctx
->nl
= U32(count
);
201 ctx
->nh
= U32((count
>> 16) >> 16);
204 /* --- @md4_hash@ --- *
206 * Arguments: @md4_ctx *ctx@ = pointer to context block
207 * @const void *buf@ = buffer of data to hash
208 * @size_t sz@ = size of buffer to hash
212 * Use: Hashes a buffer of data. The buffer may be of any size and
216 void md4_hash(md4_ctx
*ctx
, const void *buf
, size_t sz
)
218 HASH_BUFFER(MD4
, md4
, ctx
, buf
, sz
);
221 /* --- @md4_done@ --- *
223 * Arguments: @md4_ctx *ctx@ = pointer to context block
224 * @void *hash@ = pointer to output buffer
228 * Use: Returns the hash of the data read so far.
231 void md4_done(md4_ctx
*ctx
, void *hash
)
234 HASH_MD5STRENGTH(MD4
, md4
, ctx
);
235 STORE32_L(p
+ 0, ctx
->a
);
236 STORE32_L(p
+ 4, ctx
->b
);
237 STORE32_L(p
+ 8, ctx
->c
);
238 STORE32_L(p
+ 12, ctx
->d
);
241 /* --- @md4_state@ --- *
243 * Arguments: @md4_ctx *ctx@ = pointer to context
244 * @void *state@ = pointer to buffer for current state
246 * Returns: Number of bytes written to the hash function so far.
248 * Use: Returns the current state of the hash function such that
249 * it can be passed to @md4_set@.
252 unsigned long md4_state(md4_ctx
*ctx
, void *state
)
255 STORE32_L(p
+ 0, ctx
->a
);
256 STORE32_L(p
+ 4, ctx
->b
);
257 STORE32_L(p
+ 8, ctx
->c
);
258 STORE32_L(p
+ 12, ctx
->d
);
259 return (ctx
->nl
| ((ctx
->nh
>> 16) >> 16));
262 /* --- Generic interface --- */
266 /* --- Test rig --- */
270 /*----- That's all, folks -------------------------------------------------*/