1 /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm
5 SPDX-License-Identifier: RSA-MD
7 Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
9 License to copy and use this software is granted provided that it
10 is identified as the "RSA Data Security, Inc. MD4 Message-Digest
11 Algorithm" in all material mentioning or referencing this software
14 License is also granted to make and use derivative works provided
15 that such works are identified as "derived from the RSA Data
16 Security, Inc. MD4 Message-Digest Algorithm" in all material
17 mentioning or referencing the derived work.
19 RSA Data Security, Inc. makes no representations concerning either
20 the merchantability of this software or the suitability of this
21 software for any particular purpose. It is provided "as is"
22 without express or implied warranty of any kind.
24 These notices must be retained in any copies of any part of this
25 documentation and/or software.
28 #include <sys/cdefs.h>
29 #include <sys/param.h>
30 #include <sys/systm.h>
33 typedef unsigned char *POINTER;
34 typedef u_int16_t UINT2;
35 typedef u_int32_t UINT4;
37 #define PROTO_LIST(list) list
39 /* Constants for MD4Transform routine.
54 static void MD4Transform PROTO_LIST ((UINT4 [4], const unsigned char [64]));
55 static void Encode PROTO_LIST
56 ((unsigned char *, UINT4 *, unsigned int));
57 static void Decode PROTO_LIST
58 ((UINT4 *, const unsigned char *, unsigned int));
60 static unsigned char PADDING[64] = {
61 0x80, 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, 0, 0, 0, 0,
63 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
66 /* F, G and H are basic MD4 functions.
68 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
69 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
70 #define H(x, y, z) ((x) ^ (y) ^ (z))
72 /* ROTATE_LEFT rotates x left n bits.
74 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
76 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
77 /* Rotation is separate from addition to prevent recomputation */
78 #define FF(a, b, c, d, x, s) { \
79 (a) += F ((b), (c), (d)) + (x); \
80 (a) = ROTATE_LEFT ((a), (s)); \
82 #define GG(a, b, c, d, x, s) { \
83 (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
84 (a) = ROTATE_LEFT ((a), (s)); \
86 #define HH(a, b, c, d, x, s) { \
87 (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
88 (a) = ROTATE_LEFT ((a), (s)); \
91 /* MD4 initialization. Begins an MD4 operation, writing a new context.
94 MD4Init(MD4_CTX *context)
96 context->count[0] = context->count[1] = 0;
98 /* Load magic initialization constants.
100 context->state[0] = 0x67452301;
101 context->state[1] = 0xefcdab89;
102 context->state[2] = 0x98badcfe;
103 context->state[3] = 0x10325476;
106 /* MD4 block update operation. Continues an MD4 message-digest
107 operation, processing another message block, and updating the
111 MD4Update(MD4_CTX *context, const unsigned char *input,
112 unsigned int inputLen)
114 unsigned int i, index, partLen;
116 /* Compute number of bytes mod 64 */
117 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
118 /* Update number of bits */
119 if ((context->count[0] += ((UINT4)inputLen << 3))
120 < ((UINT4)inputLen << 3))
122 context->count[1] += ((UINT4)inputLen >> 29);
124 partLen = 64 - index;
125 /* Transform as many times as possible.
127 if (inputLen >= partLen) {
128 bcopy(input, &context->buffer[index], partLen);
129 MD4Transform (context->state, context->buffer);
131 for (i = partLen; i + 63 < inputLen; i += 64)
132 MD4Transform (context->state, &input[i]);
139 /* Buffer remaining input */
140 bcopy(&input[i], &context->buffer[index], inputLen-i);
145 MD4Pad(MD4_CTX *context)
147 unsigned char bits[8];
148 unsigned int index, padLen;
150 /* Save number of bits */
151 Encode (bits, context->count, 8);
153 /* Pad out to 56 mod 64.
155 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
156 padLen = (index < 56) ? (56 - index) : (120 - index);
157 MD4Update (context, PADDING, padLen);
159 /* Append length (before padding) */
160 MD4Update (context, bits, 8);
163 /* MD4 finalization. Ends an MD4 message-digest operation, writing the
164 the message digest and zeroizing the context.
167 MD4Final(unsigned char digest[static 16], MD4_CTX *context)
172 /* Store state in digest */
173 Encode (digest, context->state, 16);
175 /* Zeroize sensitive information.
177 bzero(context, sizeof (*context));
180 /* MD4 basic transformation. Transforms state based on block.
183 MD4Transform(UINT4 state[4], const unsigned char block[64])
185 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
187 Decode (x, block, 64);
190 FF (a, b, c, d, x[ 0], S11); /* 1 */
191 FF (d, a, b, c, x[ 1], S12); /* 2 */
192 FF (c, d, a, b, x[ 2], S13); /* 3 */
193 FF (b, c, d, a, x[ 3], S14); /* 4 */
194 FF (a, b, c, d, x[ 4], S11); /* 5 */
195 FF (d, a, b, c, x[ 5], S12); /* 6 */
196 FF (c, d, a, b, x[ 6], S13); /* 7 */
197 FF (b, c, d, a, x[ 7], S14); /* 8 */
198 FF (a, b, c, d, x[ 8], S11); /* 9 */
199 FF (d, a, b, c, x[ 9], S12); /* 10 */
200 FF (c, d, a, b, x[10], S13); /* 11 */
201 FF (b, c, d, a, x[11], S14); /* 12 */
202 FF (a, b, c, d, x[12], S11); /* 13 */
203 FF (d, a, b, c, x[13], S12); /* 14 */
204 FF (c, d, a, b, x[14], S13); /* 15 */
205 FF (b, c, d, a, x[15], S14); /* 16 */
208 GG (a, b, c, d, x[ 0], S21); /* 17 */
209 GG (d, a, b, c, x[ 4], S22); /* 18 */
210 GG (c, d, a, b, x[ 8], S23); /* 19 */
211 GG (b, c, d, a, x[12], S24); /* 20 */
212 GG (a, b, c, d, x[ 1], S21); /* 21 */
213 GG (d, a, b, c, x[ 5], S22); /* 22 */
214 GG (c, d, a, b, x[ 9], S23); /* 23 */
215 GG (b, c, d, a, x[13], S24); /* 24 */
216 GG (a, b, c, d, x[ 2], S21); /* 25 */
217 GG (d, a, b, c, x[ 6], S22); /* 26 */
218 GG (c, d, a, b, x[10], S23); /* 27 */
219 GG (b, c, d, a, x[14], S24); /* 28 */
220 GG (a, b, c, d, x[ 3], S21); /* 29 */
221 GG (d, a, b, c, x[ 7], S22); /* 30 */
222 GG (c, d, a, b, x[11], S23); /* 31 */
223 GG (b, c, d, a, x[15], S24); /* 32 */
226 HH (a, b, c, d, x[ 0], S31); /* 33 */
227 HH (d, a, b, c, x[ 8], S32); /* 34 */
228 HH (c, d, a, b, x[ 4], S33); /* 35 */
229 HH (b, c, d, a, x[12], S34); /* 36 */
230 HH (a, b, c, d, x[ 2], S31); /* 37 */
231 HH (d, a, b, c, x[10], S32); /* 38 */
232 HH (c, d, a, b, x[ 6], S33); /* 39 */
233 HH (b, c, d, a, x[14], S34); /* 40 */
234 HH (a, b, c, d, x[ 1], S31); /* 41 */
235 HH (d, a, b, c, x[ 9], S32); /* 42 */
236 HH (c, d, a, b, x[ 5], S33); /* 43 */
237 HH (b, c, d, a, x[13], S34); /* 44 */
238 HH (a, b, c, d, x[ 3], S31); /* 45 */
239 HH (d, a, b, c, x[11], S32); /* 46 */
240 HH (c, d, a, b, x[ 7], S33); /* 47 */
241 HH (b, c, d, a, x[15], S34); /* 48 */
248 /* Zeroize sensitive information.
250 bzero((POINTER)x, sizeof (x));
253 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
257 Encode(unsigned char *output, UINT4 *input, unsigned int len)
261 for (i = 0, j = 0; j < len; i++, j += 4) {
262 output[j] = (unsigned char)(input[i] & 0xff);
263 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
264 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
265 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
269 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
273 Decode(UINT4 *output, const unsigned char *input, unsigned int len)
277 for (i = 0, j = 0; j < len; i++, j += 4)
278 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
279 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);