1 /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm
2 */
3
4 #include <sys/cdefs.h>
5 /*-
6 SPDX-License-Identifier: RSA-MD
7
8 Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
9
10 License to copy and use this software is granted provided that it
11 is identified as the "RSA Data Security, Inc. MD4 Message-Digest
12 Algorithm" in all material mentioning or referencing this software
13 or this function.
14
15 License is also granted to make and use derivative works provided
16 that such works are identified as "derived from the RSA Data
17 Security, Inc. MD4 Message-Digest Algorithm" in all material
18 mentioning or referencing the derived work.
19
20 RSA Data Security, Inc. makes no representations concerning either
21 the merchantability of this software or the suitability of this
22 software for any particular purpose. It is provided "as is"
23 without express or implied warranty of any kind.
24
25 These notices must be retained in any copies of any part of this
26 documentation and/or software.
27 */
28
29 #include <sys/types.h>
30 #include <string.h>
31 #include "md4.h"
32
33 typedef unsigned char *POINTER;
34 typedef const unsigned char *CONST_POINTER;
35 typedef u_int16_t UINT2;
36 typedef u_int32_t UINT4;
37
38 #define PROTO_LIST(list) list
39
40 /* Constants for MD4Transform routine.
41 */
42 #define S11 3
43 #define S12 7
44 #define S13 11
45 #define S14 19
46 #define S21 3
47 #define S22 5
48 #define S23 9
49 #define S24 13
50 #define S31 3
51 #define S32 9
52 #define S33 11
53 #define S34 15
54
55 static void MD4Transform PROTO_LIST ((UINT4 [4], const unsigned char [64]));
56 static void Encode PROTO_LIST
57 ((unsigned char *, UINT4 *, unsigned int));
58 static void Decode PROTO_LIST
59 ((UINT4 *, const unsigned char *, unsigned int));
60
61 static unsigned char PADDING[64] = {
62 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
63 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
64 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
65 };
66
67 /* F, G and H are basic MD4 functions.
68 */
69 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
70 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
71 #define H(x, y, z) ((x) ^ (y) ^ (z))
72
73 /* ROTATE_LEFT rotates x left n bits.
74 */
75 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
76
77 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
78 /* Rotation is separate from addition to prevent recomputation */
79 #define FF(a, b, c, d, x, s) { \
80 (a) += F ((b), (c), (d)) + (x); \
81 (a) = ROTATE_LEFT ((a), (s)); \
82 }
83 #define GG(a, b, c, d, x, s) { \
84 (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
85 (a) = ROTATE_LEFT ((a), (s)); \
86 }
87 #define HH(a, b, c, d, x, s) { \
88 (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
89 (a) = ROTATE_LEFT ((a), (s)); \
90 }
91
92 /* MD4 initialization. Begins an MD4 operation, writing a new context.
93 */
94 void
MD4Init(MD4_CTX * context)95 MD4Init(MD4_CTX *context)
96 {
97 context->count[0] = context->count[1] = 0;
98
99 /* Load magic initialization constants.
100 */
101 context->state[0] = 0x67452301;
102 context->state[1] = 0xefcdab89;
103 context->state[2] = 0x98badcfe;
104 context->state[3] = 0x10325476;
105 }
106
107 /* MD4 block update operation. Continues an MD4 message-digest
108 operation, processing another message block, and updating the
109 context.
110 */
111 void
MD4Update(MD4_CTX * context,const void * in,unsigned int inputLen)112 MD4Update(MD4_CTX *context, const void *in, unsigned int inputLen)
113 {
114 unsigned int i, idx, partLen;
115 const unsigned char *input = in;
116
117 /* Compute number of bytes mod 64 */
118 idx = (unsigned int)((context->count[0] >> 3) & 0x3F);
119 /* Update number of bits */
120 if ((context->count[0] += ((UINT4)inputLen << 3))
121 < ((UINT4)inputLen << 3))
122 context->count[1]++;
123 context->count[1] += ((UINT4)inputLen >> 29);
124
125 partLen = 64 - idx;
126 /* Transform as many times as possible.
127 */
128 if (inputLen >= partLen) {
129 memcpy
130 ((POINTER)&context->buffer[idx], (CONST_POINTER)input, partLen);
131 MD4Transform (context->state, context->buffer);
132
133 for (i = partLen; i + 63 < inputLen; i += 64)
134 MD4Transform (context->state, &input[i]);
135
136 idx = 0;
137 }
138 else
139 i = 0;
140
141 /* Buffer remaining input */
142 memcpy
143 ((POINTER)&context->buffer[idx], (CONST_POINTER)&input[i],
144 inputLen-i);
145 }
146
147 /* MD4 padding. */
148 void
MD4Pad(MD4_CTX * context)149 MD4Pad(MD4_CTX *context)
150 {
151 unsigned char bits[8];
152 unsigned int idx, padLen;
153
154 /* Save number of bits */
155 Encode (bits, context->count, 8);
156
157 /* Pad out to 56 mod 64.
158 */
159 idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
160 padLen = (idx < 56) ? (56 - idx) : (120 - idx);
161 MD4Update (context, PADDING, padLen);
162
163 /* Append length (before padding) */
164 MD4Update (context, bits, 8);
165 }
166
167 /* MD4 finalization. Ends an MD4 message-digest operation, writing the
168 the message digest and zeroizing the context.
169 */
170 void
MD4Final(unsigned char digest[16],MD4_CTX * context)171 MD4Final(unsigned char digest[16], MD4_CTX *context)
172 {
173 /* Do padding */
174 MD4Pad (context);
175
176 /* Store state in digest */
177 Encode (digest, context->state, 16);
178
179 /* Zeroize sensitive information.
180 */
181 explicit_bzero(context, sizeof(*context));
182 }
183
184 /* MD4 basic transformation. Transforms state based on block.
185 */
186 static void
MD4Transform(UINT4 state[4],const unsigned char block[64])187 MD4Transform(UINT4 state[4], const unsigned char block[64])
188 {
189 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
190
191 Decode (x, block, 64);
192
193 /* Round 1 */
194 FF (a, b, c, d, x[ 0], S11); /* 1 */
195 FF (d, a, b, c, x[ 1], S12); /* 2 */
196 FF (c, d, a, b, x[ 2], S13); /* 3 */
197 FF (b, c, d, a, x[ 3], S14); /* 4 */
198 FF (a, b, c, d, x[ 4], S11); /* 5 */
199 FF (d, a, b, c, x[ 5], S12); /* 6 */
200 FF (c, d, a, b, x[ 6], S13); /* 7 */
201 FF (b, c, d, a, x[ 7], S14); /* 8 */
202 FF (a, b, c, d, x[ 8], S11); /* 9 */
203 FF (d, a, b, c, x[ 9], S12); /* 10 */
204 FF (c, d, a, b, x[10], S13); /* 11 */
205 FF (b, c, d, a, x[11], S14); /* 12 */
206 FF (a, b, c, d, x[12], S11); /* 13 */
207 FF (d, a, b, c, x[13], S12); /* 14 */
208 FF (c, d, a, b, x[14], S13); /* 15 */
209 FF (b, c, d, a, x[15], S14); /* 16 */
210
211 /* Round 2 */
212 GG (a, b, c, d, x[ 0], S21); /* 17 */
213 GG (d, a, b, c, x[ 4], S22); /* 18 */
214 GG (c, d, a, b, x[ 8], S23); /* 19 */
215 GG (b, c, d, a, x[12], S24); /* 20 */
216 GG (a, b, c, d, x[ 1], S21); /* 21 */
217 GG (d, a, b, c, x[ 5], S22); /* 22 */
218 GG (c, d, a, b, x[ 9], S23); /* 23 */
219 GG (b, c, d, a, x[13], S24); /* 24 */
220 GG (a, b, c, d, x[ 2], S21); /* 25 */
221 GG (d, a, b, c, x[ 6], S22); /* 26 */
222 GG (c, d, a, b, x[10], S23); /* 27 */
223 GG (b, c, d, a, x[14], S24); /* 28 */
224 GG (a, b, c, d, x[ 3], S21); /* 29 */
225 GG (d, a, b, c, x[ 7], S22); /* 30 */
226 GG (c, d, a, b, x[11], S23); /* 31 */
227 GG (b, c, d, a, x[15], S24); /* 32 */
228
229 /* Round 3 */
230 HH (a, b, c, d, x[ 0], S31); /* 33 */
231 HH (d, a, b, c, x[ 8], S32); /* 34 */
232 HH (c, d, a, b, x[ 4], S33); /* 35 */
233 HH (b, c, d, a, x[12], S34); /* 36 */
234 HH (a, b, c, d, x[ 2], S31); /* 37 */
235 HH (d, a, b, c, x[10], S32); /* 38 */
236 HH (c, d, a, b, x[ 6], S33); /* 39 */
237 HH (b, c, d, a, x[14], S34); /* 40 */
238 HH (a, b, c, d, x[ 1], S31); /* 41 */
239 HH (d, a, b, c, x[ 9], S32); /* 42 */
240 HH (c, d, a, b, x[ 5], S33); /* 43 */
241 HH (b, c, d, a, x[13], S34); /* 44 */
242 HH (a, b, c, d, x[ 3], S31); /* 45 */
243 HH (d, a, b, c, x[11], S32); /* 46 */
244 HH (c, d, a, b, x[ 7], S33); /* 47 */
245 HH (b, c, d, a, x[15], S34); /* 48 */
246
247 state[0] += a;
248 state[1] += b;
249 state[2] += c;
250 state[3] += d;
251
252 /* Zeroize sensitive information.
253 */
254 memset ((POINTER)x, 0, sizeof (x));
255 }
256
257 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
258 a multiple of 4.
259 */
260 static void
Encode(unsigned char * output,UINT4 * input,unsigned int len)261 Encode(unsigned char *output, UINT4 *input, unsigned int len)
262 {
263 unsigned int i, j;
264
265 for (i = 0, j = 0; j < len; i++, j += 4) {
266 output[j] = (unsigned char)(input[i] & 0xff);
267 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
268 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
269 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
270 }
271 }
272
273 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
274 a multiple of 4.
275 */
276 static void
Decode(UINT4 * output,const unsigned char * input,unsigned int len)277 Decode(UINT4 *output, const unsigned char *input, unsigned int len)
278 {
279 unsigned int i, j;
280
281 for (i = 0, j = 0; j < len; i++, j += 4)
282 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
283 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
284 }
285
286 #ifdef WEAK_REFS
287 /* When building libmd, provide weak references. Note: this is not
288 activated in the context of compiling these sources for internal
289 use in libcrypt.
290 */
291 #undef MD4Init
292 __weak_reference(_libmd_MD4Init, MD4Init);
293 #undef MD4Update
294 __weak_reference(_libmd_MD4Update, MD4Update);
295 #undef MD4Pad
296 __weak_reference(_libmd_MD4Pad, MD4Pad);
297 #undef MD4Final
298 __weak_reference(_libmd_MD4Final, MD4Final);
299 #endif
300