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.
29 /* Constants for MD4Transform routine.
44 static void MD4Transform (uint32_t [4], unsigned char [64]);
45 static void Encode (unsigned char *, uint32_t *, unsigned int);
46 static void Decode (uint32_t *, unsigned char *, unsigned int);
48 static unsigned char PADDING[64] = {
49 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
50 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
51 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
54 /* F, G and H are basic MD4 functions.
56 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
57 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
58 #define H(x, y, z) ((x) ^ (y) ^ (z))
60 /* ROTATE_LEFT rotates x left n bits.
62 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
64 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
65 /* Rotation is separate from addition to prevent recomputation */
67 #define FF(a, b, c, d, x, s) { \
68 (a) += F ((b), (c), (d)) + (x); \
69 (a) = ROTATE_LEFT ((a), (s)); \
71 #define GG(a, b, c, d, x, s) { \
72 (a) += G ((b), (c), (d)) + (x) + (uint32_t)0x5a827999; \
73 (a) = ROTATE_LEFT ((a), (s)); \
75 #define HH(a, b, c, d, x, s) { \
76 (a) += H ((b), (c), (d)) + (x) + (uint32_t)0x6ed9eba1; \
77 (a) = ROTATE_LEFT ((a), (s)); \
80 /* MD4 initialization. Begins an MD4 operation, writing a new context.
82 void MD4Init (MD4_CTX *context)
84 context->count[0] = context->count[1] = 0;
86 /* Load magic initialization constants.
88 context->state[0] = 0x67452301;
89 context->state[1] = 0xefcdab89;
90 context->state[2] = 0x98badcfe;
91 context->state[3] = 0x10325476;
94 /* MD4 block update operation. Continues an MD4 message-digest
95 operation, processing another message block, and updating the
98 void MD4Update (MD4_CTX *context, unsigned char *input, unsigned int inputLen)
100 unsigned int i, index, partLen;
102 /* Compute number of bytes mod 64 */
103 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
104 /* Update number of bits */
105 if ((context->count[0] += ((uint32_t)inputLen << 3))
106 < ((uint32_t)inputLen << 3))
108 context->count[1] += ((uint32_t)inputLen >> 29);
110 partLen = 64 - index;
112 /* Transform as many times as possible.
114 if (inputLen >= partLen) {
116 ((unsigned char *)&context->buffer[index], (unsigned char *)input, partLen);
117 MD4Transform (context->state, context->buffer);
119 for (i = partLen; i + 63 < inputLen; i += 64)
120 MD4Transform (context->state, &input[i]);
127 /* Buffer remaining input */
129 ((unsigned char *)&context->buffer[index], (unsigned char *)&input[i],
133 /* MD4 finalization. Ends an MD4 message-digest operation, writing the
134 the message digest and zeroizing the context.
136 void MD4Final (unsigned char digest[16], MD4_CTX *context)
138 unsigned char bits[8];
139 unsigned int index, padLen;
141 /* Save number of bits */
142 Encode (bits, context->count, 8);
144 /* Pad out to 56 mod 64.
146 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
147 padLen = (index < 56) ? (56 - index) : (120 - index);
148 MD4Update (context, PADDING, padLen);
150 /* Append length (before padding) */
151 MD4Update (context, bits, 8);
152 /* Store state in digest */
153 Encode (digest, context->state, 16);
155 /* Zeroize sensitive information.
157 memset ((unsigned char *)context, 0, sizeof (*context));
161 /* MD4 basic transformation. Transforms state based on block.
163 static void MD4Transform (uint32_t state[4], unsigned char block[64])
165 uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
167 Decode (x, block, 64);
170 FF (a, b, c, d, x[ 0], S11); /* 1 */
171 FF (d, a, b, c, x[ 1], S12); /* 2 */
172 FF (c, d, a, b, x[ 2], S13); /* 3 */
173 FF (b, c, d, a, x[ 3], S14); /* 4 */
174 FF (a, b, c, d, x[ 4], S11); /* 5 */
175 FF (d, a, b, c, x[ 5], S12); /* 6 */
176 FF (c, d, a, b, x[ 6], S13); /* 7 */
177 FF (b, c, d, a, x[ 7], S14); /* 8 */
178 FF (a, b, c, d, x[ 8], S11); /* 9 */
179 FF (d, a, b, c, x[ 9], S12); /* 10 */
180 FF (c, d, a, b, x[10], S13); /* 11 */
181 FF (b, c, d, a, x[11], S14); /* 12 */
182 FF (a, b, c, d, x[12], S11); /* 13 */
183 FF (d, a, b, c, x[13], S12); /* 14 */
184 FF (c, d, a, b, x[14], S13); /* 15 */
185 FF (b, c, d, a, x[15], S14); /* 16 */
188 GG (a, b, c, d, x[ 0], S21); /* 17 */
189 GG (d, a, b, c, x[ 4], S22); /* 18 */
190 GG (c, d, a, b, x[ 8], S23); /* 19 */
191 GG (b, c, d, a, x[12], S24); /* 20 */
192 GG (a, b, c, d, x[ 1], S21); /* 21 */
193 GG (d, a, b, c, x[ 5], S22); /* 22 */
194 GG (c, d, a, b, x[ 9], S23); /* 23 */
195 GG (b, c, d, a, x[13], S24); /* 24 */
196 GG (a, b, c, d, x[ 2], S21); /* 25 */
197 GG (d, a, b, c, x[ 6], S22); /* 26 */
198 GG (c, d, a, b, x[10], S23); /* 27 */
199 GG (b, c, d, a, x[14], S24); /* 28 */
200 GG (a, b, c, d, x[ 3], S21); /* 29 */
201 GG (d, a, b, c, x[ 7], S22); /* 30 */
202 GG (c, d, a, b, x[11], S23); /* 31 */
203 GG (b, c, d, a, x[15], S24); /* 32 */
206 HH (a, b, c, d, x[ 0], S31); /* 33 */
207 HH (d, a, b, c, x[ 8], S32); /* 34 */
208 HH (c, d, a, b, x[ 4], S33); /* 35 */
209 HH (b, c, d, a, x[12], S34); /* 36 */
210 HH (a, b, c, d, x[ 2], S31); /* 37 */
211 HH (d, a, b, c, x[10], S32); /* 38 */
212 HH (c, d, a, b, x[ 6], S33); /* 39 */
213 HH (b, c, d, a, x[14], S34); /* 40 */
214 HH (a, b, c, d, x[ 1], S31); /* 41 */
215 HH (d, a, b, c, x[ 9], S32); /* 42 */
216 HH (c, d, a, b, x[ 5], S33); /* 43 */
217 HH (b, c, d, a, x[13], S34); /* 44 */
218 HH (a, b, c, d, x[ 3], S31); /* 45 */
219 HH (d, a, b, c, x[11], S32); /* 46 */
220 HH (c, d, a, b, x[ 7], S33); /* 47 */
221 HH (b, c, d, a, x[15], S34); /* 48 */
228 /* Zeroize sensitive information.
230 memset ((unsigned char *)x, 0, sizeof (x));
233 /* Encodes input (uint32_t) into output (unsigned char). Assumes len is
236 static void Encode (unsigned char *output, uint32_t *input, unsigned int len)
240 for (i = 0, j = 0; j < len; i++, j += 4) {
241 output[j] = (unsigned char)(input[i] & 0xff);
242 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
243 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
244 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
248 /* Decodes input (unsigned char) into output (uint32_t). Assumes len is
252 static void Decode (uint32_t *output, unsigned char *input, unsigned int len)
256 for (i = 0, j = 0; j < len; i++, j += 4)
257 output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) |
258 (((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);