1 /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm
8 SPDX-License-Identifier: RSA-MD
10 Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
12 License to copy and use this software is granted provided that it
13 is identified as the "RSA Data Security, Inc. MD4 Message-Digest
14 Algorithm" in all material mentioning or referencing this software
17 License is also granted to make and use derivative works provided
18 that such works are identified as "derived from the RSA Data
19 Security, Inc. MD4 Message-Digest Algorithm" in all material
20 mentioning or referencing the derived work.
22 RSA Data Security, Inc. makes no representations concerning either
23 the merchantability of this software or the suitability of this
24 software for any particular purpose. It is provided "as is"
25 without express or implied warranty of any kind.
27 These notices must be retained in any copies of any part of this
28 documentation and/or software.
31 #include <sys/types.h>
35 typedef unsigned char *POINTER;
36 typedef const unsigned char *CONST_POINTER;
37 typedef u_int16_t UINT2;
38 typedef u_int32_t UINT4;
40 #define PROTO_LIST(list) list
42 /* Constants for MD4Transform routine.
57 static void MD4Transform PROTO_LIST ((UINT4 [4], const unsigned char [64]));
58 static void Encode PROTO_LIST
59 ((unsigned char *, UINT4 *, unsigned int));
60 static void Decode PROTO_LIST
61 ((UINT4 *, const unsigned char *, unsigned int));
63 static unsigned char PADDING[64] = {
64 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
65 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
66 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
69 /* F, G and H are basic MD4 functions.
71 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
72 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
73 #define H(x, y, z) ((x) ^ (y) ^ (z))
75 /* ROTATE_LEFT rotates x left n bits.
77 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
79 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
80 /* Rotation is separate from addition to prevent recomputation */
81 #define FF(a, b, c, d, x, s) { \
82 (a) += F ((b), (c), (d)) + (x); \
83 (a) = ROTATE_LEFT ((a), (s)); \
85 #define GG(a, b, c, d, x, s) { \
86 (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
87 (a) = ROTATE_LEFT ((a), (s)); \
89 #define HH(a, b, c, d, x, s) { \
90 (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
91 (a) = ROTATE_LEFT ((a), (s)); \
94 /* MD4 initialization. Begins an MD4 operation, writing a new context.
97 MD4Init(MD4_CTX *context)
99 context->count[0] = context->count[1] = 0;
101 /* Load magic initialization constants.
103 context->state[0] = 0x67452301;
104 context->state[1] = 0xefcdab89;
105 context->state[2] = 0x98badcfe;
106 context->state[3] = 0x10325476;
109 /* MD4 block update operation. Continues an MD4 message-digest
110 operation, processing another message block, and updating the
114 MD4Update(MD4_CTX *context, const void *in, unsigned int inputLen)
116 unsigned int i, idx, partLen;
117 const unsigned char *input = in;
119 /* Compute number of bytes mod 64 */
120 idx = (unsigned int)((context->count[0] >> 3) & 0x3F);
121 /* Update number of bits */
122 if ((context->count[0] += ((UINT4)inputLen << 3))
123 < ((UINT4)inputLen << 3))
125 context->count[1] += ((UINT4)inputLen >> 29);
128 /* Transform as many times as possible.
130 if (inputLen >= partLen) {
132 ((POINTER)&context->buffer[idx], (CONST_POINTER)input, partLen);
133 MD4Transform (context->state, context->buffer);
135 for (i = partLen; i + 63 < inputLen; i += 64)
136 MD4Transform (context->state, &input[i]);
143 /* Buffer remaining input */
145 ((POINTER)&context->buffer[idx], (CONST_POINTER)&input[i],
151 MD4Pad(MD4_CTX *context)
153 unsigned char bits[8];
154 unsigned int idx, padLen;
156 /* Save number of bits */
157 Encode (bits, context->count, 8);
159 /* Pad out to 56 mod 64.
161 idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
162 padLen = (idx < 56) ? (56 - idx) : (120 - idx);
163 MD4Update (context, PADDING, padLen);
165 /* Append length (before padding) */
166 MD4Update (context, bits, 8);
169 /* MD4 finalization. Ends an MD4 message-digest operation, writing the
170 the message digest and zeroizing the context.
173 MD4Final(unsigned char digest[16], MD4_CTX *context)
178 /* Store state in digest */
179 Encode (digest, context->state, 16);
181 /* Zeroize sensitive information.
183 explicit_bzero(context, sizeof(*context));
186 /* MD4 basic transformation. Transforms state based on block.
189 MD4Transform(UINT4 state[4], const unsigned char block[64])
191 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
193 Decode (x, block, 64);
196 FF (a, b, c, d, x[ 0], S11); /* 1 */
197 FF (d, a, b, c, x[ 1], S12); /* 2 */
198 FF (c, d, a, b, x[ 2], S13); /* 3 */
199 FF (b, c, d, a, x[ 3], S14); /* 4 */
200 FF (a, b, c, d, x[ 4], S11); /* 5 */
201 FF (d, a, b, c, x[ 5], S12); /* 6 */
202 FF (c, d, a, b, x[ 6], S13); /* 7 */
203 FF (b, c, d, a, x[ 7], S14); /* 8 */
204 FF (a, b, c, d, x[ 8], S11); /* 9 */
205 FF (d, a, b, c, x[ 9], S12); /* 10 */
206 FF (c, d, a, b, x[10], S13); /* 11 */
207 FF (b, c, d, a, x[11], S14); /* 12 */
208 FF (a, b, c, d, x[12], S11); /* 13 */
209 FF (d, a, b, c, x[13], S12); /* 14 */
210 FF (c, d, a, b, x[14], S13); /* 15 */
211 FF (b, c, d, a, x[15], S14); /* 16 */
214 GG (a, b, c, d, x[ 0], S21); /* 17 */
215 GG (d, a, b, c, x[ 4], S22); /* 18 */
216 GG (c, d, a, b, x[ 8], S23); /* 19 */
217 GG (b, c, d, a, x[12], S24); /* 20 */
218 GG (a, b, c, d, x[ 1], S21); /* 21 */
219 GG (d, a, b, c, x[ 5], S22); /* 22 */
220 GG (c, d, a, b, x[ 9], S23); /* 23 */
221 GG (b, c, d, a, x[13], S24); /* 24 */
222 GG (a, b, c, d, x[ 2], S21); /* 25 */
223 GG (d, a, b, c, x[ 6], S22); /* 26 */
224 GG (c, d, a, b, x[10], S23); /* 27 */
225 GG (b, c, d, a, x[14], S24); /* 28 */
226 GG (a, b, c, d, x[ 3], S21); /* 29 */
227 GG (d, a, b, c, x[ 7], S22); /* 30 */
228 GG (c, d, a, b, x[11], S23); /* 31 */
229 GG (b, c, d, a, x[15], S24); /* 32 */
232 HH (a, b, c, d, x[ 0], S31); /* 33 */
233 HH (d, a, b, c, x[ 8], S32); /* 34 */
234 HH (c, d, a, b, x[ 4], S33); /* 35 */
235 HH (b, c, d, a, x[12], S34); /* 36 */
236 HH (a, b, c, d, x[ 2], S31); /* 37 */
237 HH (d, a, b, c, x[10], S32); /* 38 */
238 HH (c, d, a, b, x[ 6], S33); /* 39 */
239 HH (b, c, d, a, x[14], S34); /* 40 */
240 HH (a, b, c, d, x[ 1], S31); /* 41 */
241 HH (d, a, b, c, x[ 9], S32); /* 42 */
242 HH (c, d, a, b, x[ 5], S33); /* 43 */
243 HH (b, c, d, a, x[13], S34); /* 44 */
244 HH (a, b, c, d, x[ 3], S31); /* 45 */
245 HH (d, a, b, c, x[11], S32); /* 46 */
246 HH (c, d, a, b, x[ 7], S33); /* 47 */
247 HH (b, c, d, a, x[15], S34); /* 48 */
254 /* Zeroize sensitive information.
256 memset ((POINTER)x, 0, sizeof (x));
259 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
263 Encode(unsigned char *output, UINT4 *input, unsigned int len)
267 for (i = 0, j = 0; j < len; i++, j += 4) {
268 output[j] = (unsigned char)(input[i] & 0xff);
269 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
270 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
271 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
275 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
279 Decode(UINT4 *output, const unsigned char *input, unsigned int len)
283 for (i = 0, j = 0; j < len; i++, j += 4)
284 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
285 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
289 /* When building libmd, provide weak references. Note: this is not
290 activated in the context of compiling these sources for internal
294 __weak_reference(_libmd_MD4Init, MD4Init);
296 __weak_reference(_libmd_MD4Update, MD4Update);
298 __weak_reference(_libmd_MD4Pad, MD4Pad);
300 __weak_reference(_libmd_MD4Final, MD4Final);