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sourceware.org Git - systemtap.git/blob - mdfour.c
2 a implementation of MD4 designed for use in the SMB authentication protocol
3 Copyright (C) Andrew Tridgell 1997-1998.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 /* NOTE: This code makes no attempt to be fast!
25 It assumes that a int is at least 32 bits long
28 #define MASK32 (0xffffffff)
30 #define F(X,Y,Z) ((((X)&(Y)) | ((~(X))&(Z))))
31 #define G(X,Y,Z) ((((X)&(Y)) | ((X)&(Z)) | ((Y)&(Z))))
32 #define H(X,Y,Z) (((X)^(Y)^(Z)))
33 #define lshift(x,s) (((((x)<<(s))&MASK32) | (((x)>>(32-(s)))&MASK32)))
35 #define ROUND1(a,b,c,d,k,s) a = lshift((a + F(b,c,d) + M[k])&MASK32, s)
36 #define ROUND2(a,b,c,d,k,s) a = lshift((a + G(b,c,d) + M[k] + 0x5A827999)&MASK32,s)
37 #define ROUND3(a,b,c,d,k,s) a = lshift((a + H(b,c,d) + M[k] + 0x6ED9EBA1)&MASK32,s)
39 /* this applies md4 to 64 byte chunks */
41 mdfour64(struct mdfour
*m
, uint32_t *M
)
43 uint32_t AA
, BB
, CC
, DD
;
46 A
= m
->A
; B
= m
->B
; C
= m
->C
; D
= m
->D
;
47 AA
= A
; BB
= B
; CC
= C
; DD
= D
;
49 ROUND1(A
,B
,C
,D
, 0, 3); ROUND1(D
,A
,B
,C
, 1, 7);
50 ROUND1(C
,D
,A
,B
, 2, 11); ROUND1(B
,C
,D
,A
, 3, 19);
51 ROUND1(A
,B
,C
,D
, 4, 3); ROUND1(D
,A
,B
,C
, 5, 7);
52 ROUND1(C
,D
,A
,B
, 6, 11); ROUND1(B
,C
,D
,A
, 7, 19);
53 ROUND1(A
,B
,C
,D
, 8, 3); ROUND1(D
,A
,B
,C
, 9, 7);
54 ROUND1(C
,D
,A
,B
, 10, 11); ROUND1(B
,C
,D
,A
, 11, 19);
55 ROUND1(A
,B
,C
,D
, 12, 3); ROUND1(D
,A
,B
,C
, 13, 7);
56 ROUND1(C
,D
,A
,B
, 14, 11); ROUND1(B
,C
,D
,A
, 15, 19);
59 ROUND2(A
,B
,C
,D
, 0, 3); ROUND2(D
,A
,B
,C
, 4, 5);
60 ROUND2(C
,D
,A
,B
, 8, 9); ROUND2(B
,C
,D
,A
, 12, 13);
61 ROUND2(A
,B
,C
,D
, 1, 3); ROUND2(D
,A
,B
,C
, 5, 5);
62 ROUND2(C
,D
,A
,B
, 9, 9); ROUND2(B
,C
,D
,A
, 13, 13);
63 ROUND2(A
,B
,C
,D
, 2, 3); ROUND2(D
,A
,B
,C
, 6, 5);
64 ROUND2(C
,D
,A
,B
, 10, 9); ROUND2(B
,C
,D
,A
, 14, 13);
65 ROUND2(A
,B
,C
,D
, 3, 3); ROUND2(D
,A
,B
,C
, 7, 5);
66 ROUND2(C
,D
,A
,B
, 11, 9); ROUND2(B
,C
,D
,A
, 15, 13);
68 ROUND3(A
,B
,C
,D
, 0, 3); ROUND3(D
,A
,B
,C
, 8, 9);
69 ROUND3(C
,D
,A
,B
, 4, 11); ROUND3(B
,C
,D
,A
, 12, 15);
70 ROUND3(A
,B
,C
,D
, 2, 3); ROUND3(D
,A
,B
,C
, 10, 9);
71 ROUND3(C
,D
,A
,B
, 6, 11); ROUND3(B
,C
,D
,A
, 14, 15);
72 ROUND3(A
,B
,C
,D
, 1, 3); ROUND3(D
,A
,B
,C
, 9, 9);
73 ROUND3(C
,D
,A
,B
, 5, 11); ROUND3(B
,C
,D
,A
, 13, 15);
74 ROUND3(A
,B
,C
,D
, 3, 3); ROUND3(D
,A
,B
,C
, 11, 9);
75 ROUND3(C
,D
,A
,B
, 7, 11); ROUND3(B
,C
,D
,A
, 15, 15);
80 A
&= MASK32
; B
&= MASK32
;
81 C
&= MASK32
; D
&= MASK32
;
83 m
->A
= A
; m
->B
= B
; m
->C
= C
; m
->D
= D
;
87 copy64(uint32_t *M
, const unsigned char *in
)
92 M
[i
] = (in
[i
*4+3]<<24) | (in
[i
*4+2]<<16) |
93 (in
[i
*4+1]<<8) | (in
[i
*4+0]<<0);
97 copy4(unsigned char *out
,uint32_t x
)
100 out
[1] = (x
>>8)&0xFF;
101 out
[2] = (x
>>16)&0xFF;
102 out
[3] = (x
>>24)&0xFF;
106 mdfour_begin(struct mdfour
*md
)
118 mdfour_tail(struct mdfour
*m
, const unsigned char *in
, int n
)
120 unsigned char buf
[128];
129 if (n
) memcpy(buf
, in
, n
);
149 mdfour_update(struct mdfour
*md
, const unsigned char *in
, int n
)
155 mdfour_tail(md
, md
->tail
, md
->tail_len
);
161 int len
= 64 - md
->tail_len
;
162 if (len
> n
) len
= n
;
163 memcpy(md
->tail
+md
->tail_len
, in
, len
);
167 if (md
->tail_len
== 64)
187 memcpy(md
->tail
, in
, n
);
194 mdfour_result(struct mdfour
*md
, unsigned char *out
)
199 copy4(out
+12, md
->D
);
204 mdfour(unsigned char *out
, const unsigned char *in
, int n
)
208 mdfour_update(&md
, in
, n
);
209 mdfour_update(&md
, NULL
, 0);
210 mdfour_result(&md
, out
);
213 /* vim: set sw=2 ts=8 cino=>4,n-2,{2,^-2,t0,(0,u0,w1,M1 : */
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