1 /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm
4 /* Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
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.
25 /*#include "global.h"*/
28 /* Constants for MD4Transform routine.
43 static void MD4Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
44 static void Encode PROTO_LIST
45 ((unsigned char *, UINT4 *, unsigned int));
46 static void Decode PROTO_LIST
47 ((UINT4 *, unsigned char *, unsigned int));
48 static void MD4_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
49 static void MD4_memset PROTO_LIST ((POINTER, int, unsigned int));
51 static unsigned char PADDING[64] = {
52 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
53 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
54 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
57 /* F, G and H are basic MD4 functions.
59 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
60 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
61 #define H(x, y, z) ((x) ^ (y) ^ (z))
63 /* ROTATE_LEFT rotates x left n bits.
65 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
67 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
68 /* Rotation is separate from addition to prevent recomputation */
70 #define FF(a, b, c, d, x, s) { \
71 (a) += F ((b), (c), (d)) + (x); \
72 (a) = ROTATE_LEFT ((a), (s)); \
74 #define GG(a, b, c, d, x, s) { \
75 (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
76 (a) = ROTATE_LEFT ((a), (s)); \
78 #define HH(a, b, c, d, x, s) { \
79 (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
80 (a) = ROTATE_LEFT ((a), (s)); \
83 void md4_calc(output, input, inlen)
84 unsigned char *output;
85 unsigned char *input; /* input block */
86 unsigned int inlen; /* length of input block */
91 MD4Update(&context, input, inlen);
92 MD4Final(output, &context);
95 /* MD4 initialization. Begins an MD4 operation, writing a new context.
97 void MD4Init (context)
98 MD4_CTX *context; /* context */
100 context->count[0] = context->count[1] = 0;
102 /* Load magic initialization constants.
104 context->state[0] = 0x67452301;
105 context->state[1] = 0xefcdab89;
106 context->state[2] = 0x98badcfe;
107 context->state[3] = 0x10325476;
110 /* MD4 block update operation. Continues an MD4 message-digest
111 operation, processing another message block, and updating the
114 void MD4Update (context, input, inputLen)
115 MD4_CTX *context; /* context */
116 unsigned char *input; /* input block */
117 unsigned int inputLen; /* length of input block */
119 unsigned int i, index, partLen;
121 /* Compute number of bytes mod 64 */
122 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
123 /* Update number of bits */
124 if ((context->count[0] += ((UINT4)inputLen << 3))
125 < ((UINT4)inputLen << 3))
127 context->count[1] += ((UINT4)inputLen >> 29);
129 partLen = 64 - index;
131 /* Transform as many times as possible.
133 if (inputLen >= partLen) {
135 ((POINTER)&context->buffer[index], (POINTER)input, partLen);
136 MD4Transform (context->state, context->buffer);
138 for (i = partLen; i + 63 < inputLen; i += 64)
139 MD4Transform (context->state, &input[i]);
146 /* Buffer remaining input */
148 ((POINTER)&context->buffer[index], (POINTER)&input[i],
152 /* MD4 finalization. Ends an MD4 message-digest operation, writing the
153 the message digest and zeroizing the context.
155 void MD4Final (digest, context)
156 unsigned char digest[16]; /* message digest */
157 MD4_CTX *context; /* context */
159 unsigned char bits[8];
160 unsigned int index, padLen;
162 /* Save number of bits */
163 Encode (bits, context->count, 8);
165 /* Pad out to 56 mod 64.
167 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
168 padLen = (index < 56) ? (56 - index) : (120 - index);
169 MD4Update (context, PADDING, padLen);
171 /* Append length (before padding) */
172 MD4Update (context, bits, 8);
173 /* Store state in digest */
174 Encode (digest, context->state, 16);
176 /* Zeroize sensitive information.
178 MD4_memset ((POINTER)context, 0, sizeof (*context));
181 /* MD4 basic transformation. Transforms state based on block.
183 static void MD4Transform (state, block)
185 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);
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 */
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 */
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 */
250 /* Zeroize sensitive information.
252 MD4_memset ((POINTER)x, 0, sizeof (x));
255 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
258 static void Encode (output, input, len)
259 unsigned char *output;
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);
273 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
276 static void Decode (output, input, len)
279 unsigned char *input;
284 for (i = 0, j = 0; j < len; i++, j += 4)
285 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
286 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
289 /* Note: Replace "for loop" with standard memcpy if possible.
291 static void MD4_memcpy (output, input, len)
298 for (i = 0; i < len; i++)
299 output[i] = input[i];
302 /* Note: Replace "for loop" with standard memset if possible.
304 static void MD4_memset (output, value, len)
311 for (i = 0; i < len; i++)
312 ((char *)output)[i] = (char)value;