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1 office 1 /*
2 * RFC 1186/1320 compliant MD4 implementation
3 *
4 * Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
5 *
6 * Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org>
7 *
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * * Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * * Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * * Neither the names of PolarSSL or XySSL nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
26 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35 /*
36 * The MD4 algorithm was designed by Ron Rivest in 1990.
37 *
38 * http://www.ietf.org/rfc/rfc1186.txt
39 * http://www.ietf.org/rfc/rfc1320.txt
40 */
41  
42 #include "netif/ppp/ppp_opts.h"
43 #if PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_MD4
44  
45 #include "netif/ppp/polarssl/md4.h"
46  
47 #include <string.h>
48  
49 /*
50 * 32-bit integer manipulation macros (little endian)
51 */
52 #ifndef GET_ULONG_LE
53 #define GET_ULONG_LE(n,b,i) \
54 { \
55 (n) = ( (unsigned long) (b)[(i) ] ) \
56 | ( (unsigned long) (b)[(i) + 1] << 8 ) \
57 | ( (unsigned long) (b)[(i) + 2] << 16 ) \
58 | ( (unsigned long) (b)[(i) + 3] << 24 ); \
59 }
60 #endif
61  
62 #ifndef PUT_ULONG_LE
63 #define PUT_ULONG_LE(n,b,i) \
64 { \
65 (b)[(i) ] = (unsigned char) ( (n) ); \
66 (b)[(i) + 1] = (unsigned char) ( (n) >> 8 ); \
67 (b)[(i) + 2] = (unsigned char) ( (n) >> 16 ); \
68 (b)[(i) + 3] = (unsigned char) ( (n) >> 24 ); \
69 }
70 #endif
71  
72 /*
73 * MD4 context setup
74 */
75 void md4_starts( md4_context *ctx )
76 {
77 ctx->total[0] = 0;
78 ctx->total[1] = 0;
79  
80 ctx->state[0] = 0x67452301;
81 ctx->state[1] = 0xEFCDAB89;
82 ctx->state[2] = 0x98BADCFE;
83 ctx->state[3] = 0x10325476;
84 }
85  
86 static void md4_process( md4_context *ctx, const unsigned char data[64] )
87 {
88 unsigned long X[16], A, B, C, D;
89  
90 GET_ULONG_LE( X[ 0], data, 0 );
91 GET_ULONG_LE( X[ 1], data, 4 );
92 GET_ULONG_LE( X[ 2], data, 8 );
93 GET_ULONG_LE( X[ 3], data, 12 );
94 GET_ULONG_LE( X[ 4], data, 16 );
95 GET_ULONG_LE( X[ 5], data, 20 );
96 GET_ULONG_LE( X[ 6], data, 24 );
97 GET_ULONG_LE( X[ 7], data, 28 );
98 GET_ULONG_LE( X[ 8], data, 32 );
99 GET_ULONG_LE( X[ 9], data, 36 );
100 GET_ULONG_LE( X[10], data, 40 );
101 GET_ULONG_LE( X[11], data, 44 );
102 GET_ULONG_LE( X[12], data, 48 );
103 GET_ULONG_LE( X[13], data, 52 );
104 GET_ULONG_LE( X[14], data, 56 );
105 GET_ULONG_LE( X[15], data, 60 );
106  
107 #define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
108  
109 A = ctx->state[0];
110 B = ctx->state[1];
111 C = ctx->state[2];
112 D = ctx->state[3];
113  
114 #define F(x, y, z) ((x & y) | ((~x) & z))
115 #define P(a,b,c,d,x,s) { a += F(b,c,d) + x; a = S(a,s); }
116  
117 P( A, B, C, D, X[ 0], 3 );
118 P( D, A, B, C, X[ 1], 7 );
119 P( C, D, A, B, X[ 2], 11 );
120 P( B, C, D, A, X[ 3], 19 );
121 P( A, B, C, D, X[ 4], 3 );
122 P( D, A, B, C, X[ 5], 7 );
123 P( C, D, A, B, X[ 6], 11 );
124 P( B, C, D, A, X[ 7], 19 );
125 P( A, B, C, D, X[ 8], 3 );
126 P( D, A, B, C, X[ 9], 7 );
127 P( C, D, A, B, X[10], 11 );
128 P( B, C, D, A, X[11], 19 );
129 P( A, B, C, D, X[12], 3 );
130 P( D, A, B, C, X[13], 7 );
131 P( C, D, A, B, X[14], 11 );
132 P( B, C, D, A, X[15], 19 );
133  
134 #undef P
135 #undef F
136  
137 #define F(x,y,z) ((x & y) | (x & z) | (y & z))
138 #define P(a,b,c,d,x,s) { a += F(b,c,d) + x + 0x5A827999; a = S(a,s); }
139  
140 P( A, B, C, D, X[ 0], 3 );
141 P( D, A, B, C, X[ 4], 5 );
142 P( C, D, A, B, X[ 8], 9 );
143 P( B, C, D, A, X[12], 13 );
144 P( A, B, C, D, X[ 1], 3 );
145 P( D, A, B, C, X[ 5], 5 );
146 P( C, D, A, B, X[ 9], 9 );
147 P( B, C, D, A, X[13], 13 );
148 P( A, B, C, D, X[ 2], 3 );
149 P( D, A, B, C, X[ 6], 5 );
150 P( C, D, A, B, X[10], 9 );
151 P( B, C, D, A, X[14], 13 );
152 P( A, B, C, D, X[ 3], 3 );
153 P( D, A, B, C, X[ 7], 5 );
154 P( C, D, A, B, X[11], 9 );
155 P( B, C, D, A, X[15], 13 );
156  
157 #undef P
158 #undef F
159  
160 #define F(x,y,z) (x ^ y ^ z)
161 #define P(a,b,c,d,x,s) { a += F(b,c,d) + x + 0x6ED9EBA1; a = S(a,s); }
162  
163 P( A, B, C, D, X[ 0], 3 );
164 P( D, A, B, C, X[ 8], 9 );
165 P( C, D, A, B, X[ 4], 11 );
166 P( B, C, D, A, X[12], 15 );
167 P( A, B, C, D, X[ 2], 3 );
168 P( D, A, B, C, X[10], 9 );
169 P( C, D, A, B, X[ 6], 11 );
170 P( B, C, D, A, X[14], 15 );
171 P( A, B, C, D, X[ 1], 3 );
172 P( D, A, B, C, X[ 9], 9 );
173 P( C, D, A, B, X[ 5], 11 );
174 P( B, C, D, A, X[13], 15 );
175 P( A, B, C, D, X[ 3], 3 );
176 P( D, A, B, C, X[11], 9 );
177 P( C, D, A, B, X[ 7], 11 );
178 P( B, C, D, A, X[15], 15 );
179  
180 #undef F
181 #undef P
182  
183 ctx->state[0] += A;
184 ctx->state[1] += B;
185 ctx->state[2] += C;
186 ctx->state[3] += D;
187 }
188  
189 /*
190 * MD4 process buffer
191 */
192 void md4_update( md4_context *ctx, const unsigned char *input, int ilen )
193 {
194 int fill;
195 unsigned long left;
196  
197 if( ilen <= 0 )
198 return;
199  
200 left = ctx->total[0] & 0x3F;
201 fill = 64 - left;
202  
203 ctx->total[0] += ilen;
204 ctx->total[0] &= 0xFFFFFFFF;
205  
206 if( ctx->total[0] < (unsigned long) ilen )
207 ctx->total[1]++;
208  
209 if( left && ilen >= fill )
210 {
211 MEMCPY( (void *) (ctx->buffer + left),
212 input, fill );
213 md4_process( ctx, ctx->buffer );
214 input += fill;
215 ilen -= fill;
216 left = 0;
217 }
218  
219 while( ilen >= 64 )
220 {
221 md4_process( ctx, input );
222 input += 64;
223 ilen -= 64;
224 }
225  
226 if( ilen > 0 )
227 {
228 MEMCPY( (void *) (ctx->buffer + left),
229 input, ilen );
230 }
231 }
232  
233 static const unsigned char md4_padding[64] =
234 {
235 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
236 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
237 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
238 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
239 };
240  
241 /*
242 * MD4 final digest
243 */
244 void md4_finish( md4_context *ctx, unsigned char output[16] )
245 {
246 unsigned long last, padn;
247 unsigned long high, low;
248 unsigned char msglen[8];
249  
250 high = ( ctx->total[0] >> 29 )
251 | ( ctx->total[1] << 3 );
252 low = ( ctx->total[0] << 3 );
253  
254 PUT_ULONG_LE( low, msglen, 0 );
255 PUT_ULONG_LE( high, msglen, 4 );
256  
257 last = ctx->total[0] & 0x3F;
258 padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
259  
260 md4_update( ctx, md4_padding, padn );
261 md4_update( ctx, msglen, 8 );
262  
263 PUT_ULONG_LE( ctx->state[0], output, 0 );
264 PUT_ULONG_LE( ctx->state[1], output, 4 );
265 PUT_ULONG_LE( ctx->state[2], output, 8 );
266 PUT_ULONG_LE( ctx->state[3], output, 12 );
267 }
268  
269 /*
270 * output = MD4( input buffer )
271 */
272 void md4( unsigned char *input, int ilen, unsigned char output[16] )
273 {
274 md4_context ctx;
275  
276 md4_starts( &ctx );
277 md4_update( &ctx, input, ilen );
278 md4_finish( &ctx, output );
279 }
280  
281 #endif /* PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_MD4 */