hammer util: avoid running concurrent cleanups
[dragonfly.git] / lib / libmd / md4c.c
blob117e49db093383066d606a4ecb09a556a816f426
1 /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm
2 * $FreeBSD: src/lib/libmd/md4c.c,v 1.10 2006/01/17 15:35:56 phk Exp $
3 * $DragonFly: src/lib/libmd/md4c.c,v 1.4 2008/09/30 16:57:05 swildner Exp $
4 */
6 /* Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
8 License to copy and use this software is granted provided that it
9 is identified as the "RSA Data Security, Inc. MD4 Message-Digest
10 Algorithm" in all material mentioning or referencing this software
11 or this function.
13 License is also granted to make and use derivative works provided
14 that such works are identified as "derived from the RSA Data
15 Security, Inc. MD4 Message-Digest Algorithm" in all material
16 mentioning or referencing the derived work.
18 RSA Data Security, Inc. makes no representations concerning either
19 the merchantability of this software or the suitability of this
20 software for any particular purpose. It is provided "as is"
21 without express or implied warranty of any kind.
23 These notices must be retained in any copies of any part of this
24 documentation and/or software.
27 #include <sys/types.h>
28 #include <string.h>
29 #include "md4.h"
31 typedef unsigned char *POINTER;
32 typedef const unsigned char *CONST_POINTER;
33 typedef u_int16_t UINT2;
34 typedef u_int32_t UINT4;
36 #define PROTO_LIST(list) list
38 /* Constants for MD4Transform routine.
40 #define S11 3
41 #define S12 7
42 #define S13 11
43 #define S14 19
44 #define S21 3
45 #define S22 5
46 #define S23 9
47 #define S24 13
48 #define S31 3
49 #define S32 9
50 #define S33 11
51 #define S34 15
53 static void MD4Transform PROTO_LIST ((UINT4 [4], const unsigned char [64]));
54 static void Encode PROTO_LIST
55 ((unsigned char *, UINT4 *, unsigned int));
56 static void Decode PROTO_LIST
57 ((UINT4 *, const unsigned char *, unsigned int));
59 static unsigned char PADDING[64] = {
60 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
61 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
62 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
65 /* F, G and H are basic MD4 functions.
67 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
68 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
69 #define H(x, y, z) ((x) ^ (y) ^ (z))
71 /* ROTATE_LEFT rotates x left n bits.
73 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
75 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
76 /* Rotation is separate from addition to prevent recomputation */
77 #define FF(a, b, c, d, x, s) { \
78 (a) += F ((b), (c), (d)) + (x); \
79 (a) = ROTATE_LEFT ((a), (s)); \
81 #define GG(a, b, c, d, x, s) { \
82 (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
83 (a) = ROTATE_LEFT ((a), (s)); \
85 #define HH(a, b, c, d, x, s) { \
86 (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
87 (a) = ROTATE_LEFT ((a), (s)); \
90 /* MD4 initialization. Begins an MD4 operation, writing a new context.
92 void
93 MD4Init (MD4_CTX *context)
95 context->count[0] = context->count[1] = 0;
97 /* Load magic initialization constants.
99 context->state[0] = 0x67452301;
100 context->state[1] = 0xefcdab89;
101 context->state[2] = 0x98badcfe;
102 context->state[3] = 0x10325476;
105 /* MD4 block update operation. Continues an MD4 message-digest
106 operation, processing another message block, and updating the
107 context.
109 void
110 MD4Update (MD4_CTX *context, const void *in, unsigned int inputLen)
112 unsigned int i, idx, partLen;
113 const unsigned char *input = in;
115 /* Compute number of bytes mod 64 */
116 idx = (unsigned int)((context->count[0] >> 3) & 0x3F);
117 /* Update number of bits */
118 if ((context->count[0] += ((UINT4)inputLen << 3))
119 < ((UINT4)inputLen << 3))
120 context->count[1]++;
121 context->count[1] += ((UINT4)inputLen >> 29);
123 partLen = 64 - idx;
124 /* Transform as many times as possible.
126 if (inputLen >= partLen) {
127 memcpy
128 ((POINTER)&context->buffer[idx], (CONST_POINTER)input, partLen);
129 MD4Transform (context->state, context->buffer);
131 for (i = partLen; i + 63 < inputLen; i += 64)
132 MD4Transform (context->state, &input[i]);
134 idx = 0;
136 else
137 i = 0;
139 /* Buffer remaining input */
140 memcpy
141 ((POINTER)&context->buffer[idx], (CONST_POINTER)&input[i],
142 inputLen-i);
145 /* MD4 padding. */
146 void
147 MD4Pad (MD4_CTX *context)
149 unsigned char bits[8];
150 unsigned int idx, padLen;
152 /* Save number of bits */
153 Encode (bits, context->count, 8);
155 /* Pad out to 56 mod 64.
157 idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
158 padLen = (idx < 56) ? (56 - idx) : (120 - idx);
159 MD4Update (context, PADDING, padLen);
161 /* Append length (before padding) */
162 MD4Update (context, bits, 8);
165 /* MD4 finalization. Ends an MD4 message-digest operation, writing the
166 the message digest and zeroizing the context.
168 void
169 MD4Final (unsigned char digest[16], MD4_CTX *context)
171 /* Do padding */
172 MD4Pad (context);
174 /* Store state in digest */
175 Encode (digest, context->state, 16);
177 /* Zeroize sensitive information.
179 memset ((POINTER)context, 0, sizeof (*context));
182 /* MD4 basic transformation. Transforms state based on block.
184 static void
185 MD4Transform (UINT4 state[4], const unsigned char block[64])
187 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
189 Decode (x, block, 64);
191 /* Round 1 */
192 FF (a, b, c, d, x[ 0], S11); /* 1 */
193 FF (d, a, b, c, x[ 1], S12); /* 2 */
194 FF (c, d, a, b, x[ 2], S13); /* 3 */
195 FF (b, c, d, a, x[ 3], S14); /* 4 */
196 FF (a, b, c, d, x[ 4], S11); /* 5 */
197 FF (d, a, b, c, x[ 5], S12); /* 6 */
198 FF (c, d, a, b, x[ 6], S13); /* 7 */
199 FF (b, c, d, a, x[ 7], S14); /* 8 */
200 FF (a, b, c, d, x[ 8], S11); /* 9 */
201 FF (d, a, b, c, x[ 9], S12); /* 10 */
202 FF (c, d, a, b, x[10], S13); /* 11 */
203 FF (b, c, d, a, x[11], S14); /* 12 */
204 FF (a, b, c, d, x[12], S11); /* 13 */
205 FF (d, a, b, c, x[13], S12); /* 14 */
206 FF (c, d, a, b, x[14], S13); /* 15 */
207 FF (b, c, d, a, x[15], S14); /* 16 */
209 /* Round 2 */
210 GG (a, b, c, d, x[ 0], S21); /* 17 */
211 GG (d, a, b, c, x[ 4], S22); /* 18 */
212 GG (c, d, a, b, x[ 8], S23); /* 19 */
213 GG (b, c, d, a, x[12], S24); /* 20 */
214 GG (a, b, c, d, x[ 1], S21); /* 21 */
215 GG (d, a, b, c, x[ 5], S22); /* 22 */
216 GG (c, d, a, b, x[ 9], S23); /* 23 */
217 GG (b, c, d, a, x[13], S24); /* 24 */
218 GG (a, b, c, d, x[ 2], S21); /* 25 */
219 GG (d, a, b, c, x[ 6], S22); /* 26 */
220 GG (c, d, a, b, x[10], S23); /* 27 */
221 GG (b, c, d, a, x[14], S24); /* 28 */
222 GG (a, b, c, d, x[ 3], S21); /* 29 */
223 GG (d, a, b, c, x[ 7], S22); /* 30 */
224 GG (c, d, a, b, x[11], S23); /* 31 */
225 GG (b, c, d, a, x[15], S24); /* 32 */
227 /* Round 3 */
228 HH (a, b, c, d, x[ 0], S31); /* 33 */
229 HH (d, a, b, c, x[ 8], S32); /* 34 */
230 HH (c, d, a, b, x[ 4], S33); /* 35 */
231 HH (b, c, d, a, x[12], S34); /* 36 */
232 HH (a, b, c, d, x[ 2], S31); /* 37 */
233 HH (d, a, b, c, x[10], S32); /* 38 */
234 HH (c, d, a, b, x[ 6], S33); /* 39 */
235 HH (b, c, d, a, x[14], S34); /* 40 */
236 HH (a, b, c, d, x[ 1], S31); /* 41 */
237 HH (d, a, b, c, x[ 9], S32); /* 42 */
238 HH (c, d, a, b, x[ 5], S33); /* 43 */
239 HH (b, c, d, a, x[13], S34); /* 44 */
240 HH (a, b, c, d, x[ 3], S31); /* 45 */
241 HH (d, a, b, c, x[11], S32); /* 46 */
242 HH (c, d, a, b, x[ 7], S33); /* 47 */
243 HH (b, c, d, a, x[15], S34); /* 48 */
245 state[0] += a;
246 state[1] += b;
247 state[2] += c;
248 state[3] += d;
250 /* Zeroize sensitive information.
252 memset ((POINTER)x, 0, sizeof (x));
255 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
256 a multiple of 4.
258 static void
259 Encode (unsigned char *output, UINT4 *input, unsigned int len)
261 unsigned int i, j;
263 for (i = 0, j = 0; j < len; i++, j += 4) {
264 output[j] = (unsigned char)(input[i] & 0xff);
265 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
266 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
267 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
271 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
272 a multiple of 4.
274 static void
275 Decode (UINT4 *output, const unsigned char *input, unsigned int len)
277 unsigned int i, j;
279 for (i = 0, j = 0; j < len; i++, j += 4)
280 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
281 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);