1 /*
2 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 #pragma ident "%Z%%M% %I% %E% SMI"
7
8 /*
9 * MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm
10 */
11
12 /*
13 * Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
14 *
15 * License to copy and use this software is granted provided that it
16 * is identified as the "RSA Data Security, Inc. MD4 Message-Digest
17 * Algorithm" in all material mentioning or referencing this software
18 * or this function.
19 *
20 * License is also granted to make and use derivative works provided
21 * that such works are identified as "derived from the RSA Data
22 * Security, Inc. MD4 Message-Digest Algorithm" in all material
23 * mentioning or referencing the derived work.
24 *
25 * RSA Data Security, Inc. makes no representations concerning either
26 * the merchantability of this software or the suitability of this
27 * software for any particular purpose. It is provided "as is"
28 * without express or implied warranty of any kind.
29 *
30 * These notices must be retained in any copies of any part of this
31 * documentation and/or software.
32 */
33
34 #include <sys/types.h>
35 #ifdef _KERNEL
36 #include <sys/sunddi.h>
37 #else
38 #include <strings.h>
39 #endif /* _KERNEL */
40
41 #include <sys/md4.h>
42
43 /*
44 * Constants for MD4Transform routine.
45 */
46 #define S11 3
47 #define S12 7
48 #define S13 11
49 #define S14 19
50 #define S21 3
51 #define S22 5
52 #define S23 9
53 #define S24 13
54 #define S31 3
55 #define S32 9
56 #define S33 11
57 #define S34 15
58
59 static void MD4Transform(uint32_t [4], unsigned char [64]);
60 static void Encode(unsigned char *, uint32_t *, unsigned int);
61 static void Decode(uint32_t *, unsigned char *, unsigned int);
62
63 static unsigned char PADDING[64] = {
64 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
65 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
66 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
67 };
68
69 /*
70 * F, G and H are basic MD4 functions.
71 */
72 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
73 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
74 #define H(x, y, z) ((x) ^ (y) ^ (z))
75
76 /*
77 * ROTATE_LEFT rotates x left n bits.
78 */
79 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
80
81 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
82 /* Rotation is separate from addition to prevent recomputation */
83
84 #define FF(a, b, c, d, x, s) { \
85 (a) += F((b), (c), (d)) + (x); \
86 (a) = ROTATE_LEFT((a), (s)); \
87 }
88 #define GG(a, b, c, d, x, s) { \
89 (a) += G((b), (c), (d)) + (x) + (uint32_t)0x5a827999; \
90 (a) = ROTATE_LEFT((a), (s)); \
91 }
92 #define HH(a, b, c, d, x, s) { \
93 (a) += H((b), (c), (d)) + (x) + (uint32_t)0x6ed9eba1; \
94 (a) = ROTATE_LEFT((a), (s)); \
95 }
96
97 /*
98 * MD4 initialization. Begins an MD4 operation, writing a new context.
99 */
100 void
101 MD4Init(MD4_CTX *context)
102 {
103 context->count[0] = context->count[1] = 0;
104
105 /*
106 * Load magic initialization constants.
107 */
108 context->state[0] = 0x67452301UL;
109 context->state[1] = 0xefcdab89UL;
110 context->state[2] = 0x98badcfeUL;
111 context->state[3] = 0x10325476UL;
112 }
113
114
115 /*
116 * MD4 block update operation. Continues an MD4 message-digest
117 * operation, processing another message block, and updating the
118 * context.
119 */
120 void
121 MD4Update(MD4_CTX *context, const void *_RESTRICT_KYWD inptr, size_t inputLen)
122 {
123 unsigned int i, index, partLen;
124 uchar_t *input = (uchar_t *)inptr;
125
126 /* Compute number of bytes mod 64 */
127 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
128 /* Update number of bits */
129 if ((context->count[0] += ((uint32_t)inputLen << 3))
130 < ((uint32_t)inputLen << 3))
131 context->count[1]++;
132 context->count[1] += ((uint32_t)inputLen >> 29);
133
134 partLen = 64 - index;
135
136 /*
137 * Transform as many times as possible.
138 */
139 if (inputLen >= partLen) {
140 bcopy(input, &context->buffer[index], partLen);
141 MD4Transform(context->state, (uchar_t *)context->buffer);
142
143 for (i = partLen; i + 63 < inputLen; i += 64) {
144 MD4Transform(context->state, (uchar_t *)&input[i]);
145 }
146
147 index = 0;
148 } else {
149 i = 0;
150 }
151
152 /* Buffer remaining input */
153 bcopy(&input[i], &context->buffer[index], inputLen - i);
154 }
155
156 /*
157 * MD4 finalization. Ends an MD4 message-digest operation, writing the
158 * the message digest and zeroizing the context.
159 */
160 void
161 MD4Final(void *digest, MD4_CTX *context)
162 {
163 unsigned char bits[8];
164 unsigned int index, padLen;
165
166 /* Save number of bits */
167 Encode(bits, context->count, 8);
168
169 /*
170 * Pad out to 56 mod 64.
171 */
172 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
173 padLen = (index < 56) ? (56 - index) : (120 - index);
174 MD4Update(context, PADDING, padLen);
175
176 /* Append length (before padding) */
177 MD4Update(context, bits, 8);
178 /* Store state in digest */
179 Encode(digest, context->state, 16);
180
181 /* zeroize sensitive information */
182 bzero(context, sizeof (*context));
183 }
184
185 /*
186 * MD4 basic transformation. Transforms state based on block.
187 */
188 static void
189 MD4Transform(uint32_t state[4], unsigned char block[64])
190 {
191 uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
192
193
194 Decode(x, block, 64);
195
196 /* Round 1 */
197 FF(a, b, c, d, x[ 0], S11); /* 1 */
198 FF(d, a, b, c, x[ 1], S12); /* 2 */
199 FF(c, d, a, b, x[ 2], S13); /* 3 */
200 FF(b, c, d, a, x[ 3], S14); /* 4 */
201 FF(a, b, c, d, x[ 4], S11); /* 5 */
202 FF(d, a, b, c, x[ 5], S12); /* 6 */
203 FF(c, d, a, b, x[ 6], S13); /* 7 */
204 FF(b, c, d, a, x[ 7], S14); /* 8 */
205 FF(a, b, c, d, x[ 8], S11); /* 9 */
206 FF(d, a, b, c, x[ 9], S12); /* 10 */
207 FF(c, d, a, b, x[10], S13); /* 11 */
208 FF(b, c, d, a, x[11], S14); /* 12 */
209 FF(a, b, c, d, x[12], S11); /* 13 */
210 FF(d, a, b, c, x[13], S12); /* 14 */
211 FF(c, d, a, b, x[14], S13); /* 15 */
212 FF(b, c, d, a, x[15], S14); /* 16 */
213
214 /* Round 2 */
215 GG(a, b, c, d, x[ 0], S21); /* 17 */
216 GG(d, a, b, c, x[ 4], S22); /* 18 */
217 GG(c, d, a, b, x[ 8], S23); /* 19 */
218 GG(b, c, d, a, x[12], S24); /* 20 */
219 GG(a, b, c, d, x[ 1], S21); /* 21 */
220 GG(d, a, b, c, x[ 5], S22); /* 22 */
221 GG(c, d, a, b, x[ 9], S23); /* 23 */
222 GG(b, c, d, a, x[13], S24); /* 24 */
223 GG(a, b, c, d, x[ 2], S21); /* 25 */
224 GG(d, a, b, c, x[ 6], S22); /* 26 */
225 GG(c, d, a, b, x[10], S23); /* 27 */
226 GG(b, c, d, a, x[14], S24); /* 28 */
227 GG(a, b, c, d, x[ 3], S21); /* 29 */
228 GG(d, a, b, c, x[ 7], S22); /* 30 */
229 GG(c, d, a, b, x[11], S23); /* 31 */
230 GG(b, c, d, a, x[15], S24); /* 32 */
231
232
233 /* Round 3 */
234 HH(a, b, c, d, x[ 0], S31); /* 33 */
235 HH(d, a, b, c, x[ 8], S32); /* 34 */
236 HH(c, d, a, b, x[ 4], S33); /* 35 */
237 HH(b, c, d, a, x[12], S34); /* 36 */
238 HH(a, b, c, d, x[ 2], S31); /* 37 */
239 HH(d, a, b, c, x[10], S32); /* 38 */
240 HH(c, d, a, b, x[ 6], S33); /* 39 */
241 HH(b, c, d, a, x[14], S34); /* 40 */
242 HH(a, b, c, d, x[ 1], S31); /* 41 */
243 HH(d, a, b, c, x[ 9], S32); /* 42 */
244 HH(c, d, a, b, x[ 5], S33); /* 43 */
245 HH(b, c, d, a, x[13], S34); /* 44 */
246 HH(a, b, c, d, x[ 3], S31); /* 45 */
247 HH(d, a, b, c, x[11], S32); /* 46 */
248 HH(c, d, a, b, x[ 7], S33); /* 47 */
249 HH(b, c, d, a, x[15], S34); /* 48 */
250
251 state[0] += a;
252 state[1] += b;
253 state[2] += c;
254 state[3] += d;
255
256 /* zeroize sensitive information */
257 bzero(x, sizeof (*x));
258 }
259
260 /*
261 * Encodes input (uint32_t) into output (unsigned char). Assumes len is
262 * a multiple of 4.
263 */
264 static void
265 Encode(output, input, len)
266 unsigned char *output;
267 uint32_t *input;
268 unsigned int len;
269 {
270 unsigned int i, j;
271
272 for (i = 0, j = 0; j < len; i++, j += 4) {
273 output[j] = (unsigned char)(input[i] & 0xff);
274 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
275 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
276 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
277 }
278 }
279
280 /*
281 * Decodes input (unsigned char) into output (uint32_t). Assumes len is
282 * a multiple of 4.
283 */
284 static void
285 Decode(output, input, len)
286 uint32_t *output;
287 unsigned char *input;
288 unsigned int len;
289 {
290 unsigned int i, j;
291
292 for (i = 0, j = 0; j < len; i++, j += 4)
293 output[i] = ((uint32_t)input[j]) |
294 (((uint32_t)input[j+1]) << 8) |
295 (((uint32_t)input[j+2]) << 16) |
296 (((uint32_t)input[j+3]) << 24);
297 }