1 /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm
6 SPDX-License-Identifier: RSA-MD
8 Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
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
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.
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.
25 These notices must be retained in any copies of any part of this
26 documentation and/or software.
29 #include <sys/types.h>
33 typedef unsigned char *POINTER;
34 typedef const unsigned char *CONST_POINTER;
35 typedef u_int16_t UINT2;
36 typedef u_int32_t UINT4;
38 #define PROTO_LIST(list) list
40 /* Constants for MD4Transform routine.
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));
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
67 /* F, G and H are basic MD4 functions.
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))
73 /* ROTATE_LEFT rotates x left n bits.
75 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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)); \
83 #define GG(a, b, c, d, x, s) { \
84 (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
85 (a) = ROTATE_LEFT ((a), (s)); \
87 #define HH(a, b, c, d, x, s) { \
88 (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
89 (a) = ROTATE_LEFT ((a), (s)); \
92 /* MD4 initialization. Begins an MD4 operation, writing a new context.
95 MD4Init(MD4_CTX *context)
97 context->count[0] = context->count[1] = 0;
99 /* Load magic initialization constants.
101 context->state[0] = 0x67452301;
102 context->state[1] = 0xefcdab89;
103 context->state[2] = 0x98badcfe;
104 context->state[3] = 0x10325476;
107 /* MD4 block update operation. Continues an MD4 message-digest
108 operation, processing another message block, and updating the
112 MD4Update(MD4_CTX *context, const void *in, unsigned int inputLen)
114 unsigned int i, idx, partLen;
115 const unsigned char *input = in;
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))
123 context->count[1] += ((UINT4)inputLen >> 29);
126 /* Transform as many times as possible.
128 if (inputLen >= partLen) {
130 ((POINTER)&context->buffer[idx], (CONST_POINTER)input, partLen);
131 MD4Transform (context->state, context->buffer);
133 for (i = partLen; i + 63 < inputLen; i += 64)
134 MD4Transform (context->state, &input[i]);
141 /* Buffer remaining input */
143 ((POINTER)&context->buffer[idx], (CONST_POINTER)&input[i],
149 MD4Pad(MD4_CTX *context)
151 unsigned char bits[8];
152 unsigned int idx, padLen;
154 /* Save number of bits */
155 Encode (bits, context->count, 8);
157 /* Pad out to 56 mod 64.
159 idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
160 padLen = (idx < 56) ? (56 - idx) : (120 - idx);
161 MD4Update (context, PADDING, padLen);
163 /* Append length (before padding) */
164 MD4Update (context, bits, 8);
167 /* MD4 finalization. Ends an MD4 message-digest operation, writing the
168 the message digest and zeroizing the context.
171 MD4Final(unsigned char digest[16], MD4_CTX *context)
176 /* Store state in digest */
177 Encode (digest, context->state, 16);
179 /* Zeroize sensitive information.
181 explicit_bzero(context, sizeof(*context));
184 /* MD4 basic transformation. Transforms state based on block.
187 MD4Transform(UINT4 state[4], const unsigned char block[64])
189 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
191 Decode (x, block, 64);
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 */
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 */
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 */
252 /* Zeroize sensitive information.
254 memset ((POINTER)x, 0, sizeof (x));
257 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
261 Encode(unsigned char *output, UINT4 *input, unsigned int len)
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
277 Decode(UINT4 *output, const unsigned char *input, unsigned int len)
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);
287 /* When building libmd, provide weak references. Note: this is not
288 activated in the context of compiling these sources for internal
292 __weak_reference(_libmd_MD4Init, MD4Init);
294 __weak_reference(_libmd_MD4Update, MD4Update);
296 __weak_reference(_libmd_MD4Pad, MD4Pad);
298 __weak_reference(_libmd_MD4Final, MD4Final);