2 * md4c.c MD4 message-digest algorithm
6 * License to copy and use this software is granted provided that it
7 * is identified as the "RSA Data Security, Inc. MD4 Message-Digest
8 * Algorithm" in all material mentioning or referencing this software
11 * License is also granted to make and use derivative works provided
12 * that such works are identified as "derived from the RSA Data
13 * Security, Inc. MD4 Message-Digest Algorithm" in all material
14 * mentioning or referencing the derived work.
16 * RSA Data Security, Inc. makes no representations concerning either
17 * the merchantability of this software or the suitability of this
18 * software for any particular purpose. It is provided "as is"
19 * without express or implied warranty of any kind.
21 * These notices must be retained in any copies of any part of this
22 * documentation and/or software.
24 * Copyright 1990,1991,1992 RSA Data Security, Inc.
28 /*#include "global.h"*/
31 /* Constants for MD4Transform routine.
46 static void MD4Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
47 static void Encode PROTO_LIST
48 ((unsigned char *, UINT4 *, unsigned int));
49 static void Decode PROTO_LIST
50 ((UINT4 *, unsigned char *, unsigned int));
51 static void MD4_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
52 static void MD4_memset PROTO_LIST ((POINTER, int, unsigned int));
54 static unsigned char PADDING[64] = {
55 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
56 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
57 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
60 /* F, G and H are basic MD4 functions.
62 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
63 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
64 #define H(x, y, z) ((x) ^ (y) ^ (z))
66 /* ROTATE_LEFT rotates x left n bits.
68 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
70 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
71 /* Rotation is separate from addition to prevent recomputation */
73 #define FF(a, b, c, d, x, s) { \
74 (a) += F ((b), (c), (d)) + (x); \
75 (a) = ROTATE_LEFT ((a), (s)); \
77 #define GG(a, b, c, d, x, s) { \
78 (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
79 (a) = ROTATE_LEFT ((a), (s)); \
81 #define HH(a, b, c, d, x, s) { \
82 (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
83 (a) = ROTATE_LEFT ((a), (s)); \
86 void md4_calc(output, input, inlen)
87 unsigned char *output;
88 unsigned char *input; /* input block */
89 unsigned int inlen; /* length of input block */
94 MD4Update(&context, input, inlen);
95 MD4Final(output, &context);
98 /* MD4 initialization. Begins an MD4 operation, writing a new context.
100 void MD4Init (context)
101 MD4_CTX *context; /* context */
103 context->count[0] = context->count[1] = 0;
105 /* Load magic initialization constants.
107 context->state[0] = 0x67452301;
108 context->state[1] = 0xefcdab89;
109 context->state[2] = 0x98badcfe;
110 context->state[3] = 0x10325476;
113 /* MD4 block update operation. Continues an MD4 message-digest
114 operation, processing another message block, and updating the
117 void MD4Update (context, input, inputLen)
118 MD4_CTX *context; /* context */
119 unsigned char *input; /* input block */
120 unsigned int inputLen; /* length of input block */
122 unsigned int i, index, partLen;
124 /* Compute number of bytes mod 64 */
125 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
126 /* Update number of bits */
127 if ((context->count[0] += ((UINT4)inputLen << 3))
128 < ((UINT4)inputLen << 3))
130 context->count[1] += ((UINT4)inputLen >> 29);
132 partLen = 64 - index;
134 /* Transform as many times as possible.
136 if (inputLen >= partLen) {
138 ((POINTER)&context->buffer[index], (POINTER)input, partLen);
139 MD4Transform (context->state, context->buffer);
141 for (i = partLen; i + 63 < inputLen; i += 64)
142 MD4Transform (context->state, &input[i]);
149 /* Buffer remaining input */
151 ((POINTER)&context->buffer[index], (POINTER)&input[i],
155 /* MD4 finalization. Ends an MD4 message-digest operation, writing the
156 the message digest and zeroizing the context.
158 void MD4Final (digest, context)
159 unsigned char digest[16]; /* message digest */
160 MD4_CTX *context; /* context */
162 unsigned char bits[8];
163 unsigned int index, padLen;
165 /* Save number of bits */
166 Encode (bits, context->count, 8);
168 /* Pad out to 56 mod 64.
170 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
171 padLen = (index < 56) ? (56 - index) : (120 - index);
172 MD4Update (context, PADDING, padLen);
174 /* Append length (before padding) */
175 MD4Update (context, bits, 8);
176 /* Store state in digest */
177 Encode (digest, context->state, 16);
179 /* Zeroize sensitive information.
181 MD4_memset ((POINTER)context, 0, sizeof (*context));
184 /* MD4 basic transformation. Transforms state based on block.
186 static void MD4Transform (state, block)
188 unsigned char block[64];
190 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
192 Decode (x, block, 64);
195 FF (a, b, c, d, x[ 0], S11); /* 1 */
196 FF (d, a, b, c, x[ 1], S12); /* 2 */
197 FF (c, d, a, b, x[ 2], S13); /* 3 */
198 FF (b, c, d, a, x[ 3], S14); /* 4 */
199 FF (a, b, c, d, x[ 4], S11); /* 5 */
200 FF (d, a, b, c, x[ 5], S12); /* 6 */
201 FF (c, d, a, b, x[ 6], S13); /* 7 */
202 FF (b, c, d, a, x[ 7], S14); /* 8 */
203 FF (a, b, c, d, x[ 8], S11); /* 9 */
204 FF (d, a, b, c, x[ 9], S12); /* 10 */
205 FF (c, d, a, b, x[10], S13); /* 11 */
206 FF (b, c, d, a, x[11], S14); /* 12 */
207 FF (a, b, c, d, x[12], S11); /* 13 */
208 FF (d, a, b, c, x[13], S12); /* 14 */
209 FF (c, d, a, b, x[14], S13); /* 15 */
210 FF (b, c, d, a, x[15], S14); /* 16 */
213 GG (a, b, c, d, x[ 0], S21); /* 17 */
214 GG (d, a, b, c, x[ 4], S22); /* 18 */
215 GG (c, d, a, b, x[ 8], S23); /* 19 */
216 GG (b, c, d, a, x[12], S24); /* 20 */
217 GG (a, b, c, d, x[ 1], S21); /* 21 */
218 GG (d, a, b, c, x[ 5], S22); /* 22 */
219 GG (c, d, a, b, x[ 9], S23); /* 23 */
220 GG (b, c, d, a, x[13], S24); /* 24 */
221 GG (a, b, c, d, x[ 2], S21); /* 25 */
222 GG (d, a, b, c, x[ 6], S22); /* 26 */
223 GG (c, d, a, b, x[10], S23); /* 27 */
224 GG (b, c, d, a, x[14], S24); /* 28 */
225 GG (a, b, c, d, x[ 3], S21); /* 29 */
226 GG (d, a, b, c, x[ 7], S22); /* 30 */
227 GG (c, d, a, b, x[11], S23); /* 31 */
228 GG (b, c, d, a, x[15], S24); /* 32 */
231 HH (a, b, c, d, x[ 0], S31); /* 33 */
232 HH (d, a, b, c, x[ 8], S32); /* 34 */
233 HH (c, d, a, b, x[ 4], S33); /* 35 */
234 HH (b, c, d, a, x[12], S34); /* 36 */
235 HH (a, b, c, d, x[ 2], S31); /* 37 */
236 HH (d, a, b, c, x[10], S32); /* 38 */
237 HH (c, d, a, b, x[ 6], S33); /* 39 */
238 HH (b, c, d, a, x[14], S34); /* 40 */
239 HH (a, b, c, d, x[ 1], S31); /* 41 */
240 HH (d, a, b, c, x[ 9], S32); /* 42 */
241 HH (c, d, a, b, x[ 5], S33); /* 43 */
242 HH (b, c, d, a, x[13], S34); /* 44 */
243 HH (a, b, c, d, x[ 3], S31); /* 45 */
244 HH (d, a, b, c, x[11], S32); /* 46 */
245 HH (c, d, a, b, x[ 7], S33); /* 47 */
246 HH (b, c, d, a, x[15], S34); /* 48 */
253 /* Zeroize sensitive information.
255 MD4_memset ((POINTER)x, 0, sizeof (x));
258 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
261 static void Encode (output, input, len)
262 unsigned char *output;
268 for (i = 0, j = 0; j < len; i++, j += 4) {
269 output[j] = (unsigned char)(input[i] & 0xff);
270 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
271 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
272 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
276 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
279 static void Decode (output, input, len)
282 unsigned char *input;
287 for (i = 0, j = 0; j < len; i++, j += 4)
288 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
289 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
292 /* Note: Replace "for loop" with standard memcpy if possible.
294 static void MD4_memcpy (output, input, len)
301 for (i = 0; i < len; i++)
302 output[i] = input[i];
305 /* Note: Replace "for loop" with standard memset if possible.
307 static void MD4_memset (output, value, len)
314 for (i = 0; i < len; i++)
315 ((char *)output)[i] = (char)value;