1/*
2 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
3 * Use is subject to license terms.
4 */
5
6/*
7 * MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm
8 */
9
10/*
11 * Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
12 *
13 * License to copy and use this software is granted provided that it
14 * is identified as the "RSA Data Security, Inc. MD4 Message-Digest
15 * Algorithm" in all material mentioning or referencing this software
16 * or this function.
17 *
18 * License is also granted to make and use derivative works provided
19 * that such works are identified as "derived from the RSA Data
20 * Security, Inc. MD4 Message-Digest Algorithm" in all material
21 * mentioning or referencing the derived work.
22 *
23 * RSA Data Security, Inc. makes no representations concerning either
24 * the merchantability of this software or the suitability of this
25 * software for any particular purpose. It is provided "as is"
26 * without express or implied warranty of any kind.
27 *
28 * These notices must be retained in any copies of any part of this
29 * documentation and/or software.
30 */
31
32#include <sys/types.h>
33#ifdef _KERNEL
34#include <sys/sunddi.h>
35#else
36#include <strings.h>
37#endif /* _KERNEL */
38
39#if defined(__i386) || defined(__amd64)
40#define	UNALIGNED_POINTERS_PERMITTED
41#endif
42
43#include <sys/md4.h>
44
45/*
46 * Constants for MD4Transform routine.
47 */
48#define	S11 3
49#define	S12 7
50#define	S13 11
51#define	S14 19
52#define	S21 3
53#define	S22 5
54#define	S23 9
55#define	S24 13
56#define	S31 3
57#define	S32 9
58#define	S33 11
59#define	S34 15
60
61static void MD4Transform(uint32_t [4], unsigned char [64]);
62static void Encode(unsigned char *, uint32_t *, unsigned int);
63static void Decode(uint32_t *, unsigned char *, unsigned int);
64
65static unsigned char PADDING[64] = {
66	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
67	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
68	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
69};
70
71/*
72 * F, G and H are basic MD4 functions.
73 */
74#define	F(x, y, z) (((x) & (y)) | ((~x) & (z)))
75#define	G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
76#define	H(x, y, z) ((x) ^ (y) ^ (z))
77
78/*
79 * ROTATE_LEFT rotates x left n bits.
80 */
81#define	ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
82
83/* FF, GG and HH are transformations for rounds 1, 2 and 3 */
84/* Rotation is separate from addition to prevent recomputation */
85
86#define	FF(a, b, c, d, x, s) { \
87		(a) += F((b), (c), (d)) + (x); \
88		(a) = ROTATE_LEFT((a), (s)); \
89	}
90#define	GG(a, b, c, d, x, s) { \
91		(a) += G((b), (c), (d)) + (x) + (uint32_t)0x5a827999; \
92		(a) = ROTATE_LEFT((a), (s)); \
93	}
94#define	HH(a, b, c, d, x, s) { \
95		(a) += H((b), (c), (d)) + (x) + (uint32_t)0x6ed9eba1; \
96		(a) = ROTATE_LEFT((a), (s)); \
97	}
98
99/*
100 * MD4 initialization. Begins an MD4 operation, writing a new context.
101 */
102void
103MD4Init(MD4_CTX *context)
104{
105	context->count[0] = context->count[1] = 0;
106
107	/*
108	 * Load magic initialization constants.
109	 */
110	context->state[0] = 0x67452301UL;
111	context->state[1] = 0xefcdab89UL;
112	context->state[2] = 0x98badcfeUL;
113	context->state[3] = 0x10325476UL;
114}
115
116
117/*
118 * MD4 block update operation. Continues an MD4 message-digest
119 * operation, processing another message block, and updating the
120 * context.
121 */
122void
123MD4Update(MD4_CTX *context, const void *_RESTRICT_KYWD inptr, size_t inputLen)
124{
125	unsigned int i, index, partLen;
126	uchar_t *input = (uchar_t *)inptr;
127
128	/* Compute number of bytes mod 64 */
129	index = (unsigned int)((context->count[0] >> 3) & 0x3F);
130	/* Update number of bits */
131	if ((context->count[0] += ((uint32_t)inputLen << 3))
132	    < ((uint32_t)inputLen << 3))
133		context->count[1]++;
134	context->count[1] += ((uint32_t)inputLen >> 29);
135
136	partLen = 64 - index;
137
138	/*
139	 * Transform as many times as possible.
140	 */
141	if (inputLen >= partLen) {
142		bcopy(input, &context->buffer[index], partLen);
143		MD4Transform(context->state, (uchar_t *)context->buffer);
144
145		for (i = partLen; i + 63 < inputLen; i += 64) {
146			MD4Transform(context->state, (uchar_t *)&input[i]);
147		}
148
149		index = 0;
150	} else {
151		i = 0;
152	}
153
154	/* Buffer remaining input */
155	bcopy(&input[i], &context->buffer[index], inputLen - i);
156}
157
158/*
159 * MD4 finalization. Ends an MD4 message-digest operation, writing the
160 *	the message digest and zeroizing the context.
161 */
162void
163MD4Final(void *digest, MD4_CTX *context)
164{
165	unsigned char bits[8];
166	unsigned int index, padLen;
167
168	/* Save number of bits */
169	Encode(bits, context->count, 8);
170
171	/*
172	 * Pad out to 56 mod 64.
173	 */
174	index = (unsigned int)((context->count[0] >> 3) & 0x3f);
175	padLen = (index < 56) ? (56 - index) : (120 - index);
176	MD4Update(context, PADDING, padLen);
177
178	/* Append length (before padding) */
179	MD4Update(context, bits, 8);
180	/* Store state in digest */
181	Encode(digest, context->state, 16);
182
183	/* zeroize sensitive information */
184	bzero(context, sizeof (*context));
185}
186
187/*
188 * MD4 basic transformation. Transforms state based on block.
189 */
190static void
191MD4Transform(uint32_t state[4], unsigned char block[64])
192{
193	uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
194
195
196	Decode(x, block, 64);
197
198	/* Round 1 */
199	FF(a, b, c, d, x[ 0], S11); /* 1 */
200	FF(d, a, b, c, x[ 1], S12); /* 2 */
201	FF(c, d, a, b, x[ 2], S13); /* 3 */
202	FF(b, c, d, a, x[ 3], S14); /* 4 */
203	FF(a, b, c, d, x[ 4], S11); /* 5 */
204	FF(d, a, b, c, x[ 5], S12); /* 6 */
205	FF(c, d, a, b, x[ 6], S13); /* 7 */
206	FF(b, c, d, a, x[ 7], S14); /* 8 */
207	FF(a, b, c, d, x[ 8], S11); /* 9 */
208	FF(d, a, b, c, x[ 9], S12); /* 10 */
209	FF(c, d, a, b, x[10], S13); /* 11 */
210	FF(b, c, d, a, x[11], S14); /* 12 */
211	FF(a, b, c, d, x[12], S11); /* 13 */
212	FF(d, a, b, c, x[13], S12); /* 14 */
213	FF(c, d, a, b, x[14], S13); /* 15 */
214	FF(b, c, d, a, x[15], S14); /* 16 */
215
216	/* Round 2 */
217	GG(a, b, c, d, x[ 0], S21); /* 17 */
218	GG(d, a, b, c, x[ 4], S22); /* 18 */
219	GG(c, d, a, b, x[ 8], S23); /* 19 */
220	GG(b, c, d, a, x[12], S24); /* 20 */
221	GG(a, b, c, d, x[ 1], S21); /* 21 */
222	GG(d, a, b, c, x[ 5], S22); /* 22 */
223	GG(c, d, a, b, x[ 9], S23); /* 23 */
224	GG(b, c, d, a, x[13], S24); /* 24 */
225	GG(a, b, c, d, x[ 2], S21); /* 25 */
226	GG(d, a, b, c, x[ 6], S22); /* 26 */
227	GG(c, d, a, b, x[10], S23); /* 27 */
228	GG(b, c, d, a, x[14], S24); /* 28 */
229	GG(a, b, c, d, x[ 3], S21); /* 29 */
230	GG(d, a, b, c, x[ 7], S22); /* 30 */
231	GG(c, d, a, b, x[11], S23); /* 31 */
232	GG(b, c, d, a, x[15], S24); /* 32 */
233
234
235	/* Round 3 */
236	HH(a, b, c, d, x[ 0], S31); /* 33 */
237	HH(d, a, b, c, x[ 8], S32); /* 34 */
238	HH(c, d, a, b, x[ 4], S33); /* 35 */
239	HH(b, c, d, a, x[12], S34); /* 36 */
240	HH(a, b, c, d, x[ 2], S31); /* 37 */
241	HH(d, a, b, c, x[10], S32); /* 38 */
242	HH(c, d, a, b, x[ 6], S33); /* 39 */
243	HH(b, c, d, a, x[14], S34); /* 40 */
244	HH(a, b, c, d, x[ 1], S31); /* 41 */
245	HH(d, a, b, c, x[ 9], S32); /* 42 */
246	HH(c, d, a, b, x[ 5], S33); /* 43 */
247	HH(b, c, d, a, x[13], S34); /* 44 */
248	HH(a, b, c, d, x[ 3], S31); /* 45 */
249	HH(d, a, b, c, x[11], S32); /* 46 */
250	HH(c, d, a, b, x[ 7], S33); /* 47 */
251	HH(b, c, d, a, x[15], S34); /* 48 */
252
253	state[0] += a;
254	state[1] += b;
255	state[2] += c;
256	state[3] += d;
257
258	/* zeroize sensitive information */
259	bzero(x, sizeof (*x));
260}
261
262/*
263 * Encodes input (uint32_t) into output (unsigned char). Assumes len is
264 * a multiple of 4.
265 */
266static void
267Encode(unsigned char *output, uint32_t *input, unsigned int len)
268{
269	unsigned int i, j;
270
271	for (i = 0, j = 0; j < len; i++, j += 4) {
272#if defined(_LITTLE_ENDIAN) && defined(UNALIGNED_POINTERS_PERMITTED)
273		*(uint32_t *)(void *)&output[j] = input[i];
274#else
275		/* endian-independent code */
276		output[j] = (unsigned char)(input[i] & 0xff);
277		output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
278		output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
279		output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
280#endif	/* _LITTLE_ENDIAN && UNALIGNED_POINTERS_PERMITTED */
281	}
282}
283
284/*
285 * Decodes input (unsigned char) into output (uint32_t). Assumes len is
286 * a multiple of 4.
287 */
288static void
289Decode(uint32_t *output, unsigned char *input, unsigned int len)
290{
291	unsigned int i, j;
292
293	for (i = 0, j = 0; j < len; i++, j += 4) {
294#if defined(_LITTLE_ENDIAN) && defined(UNALIGNED_POINTERS_PERMITTED)
295		output[i] = *(uint32_t *)(void *)&input[j];
296#else
297		/* endian-independent code */
298		output[i] = ((uint32_t)input[j]) |
299		    (((uint32_t)input[j+1]) << 8) |
300		    (((uint32_t)input[j+2]) << 16) |
301		    (((uint32_t)input[j+3]) << 24);
302#endif	/* _LITTLE_ENDIAN && UNALIGNED_POINTERS_PERMITTED */
303	}
304
305}
306