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.
96 void MD4Init (context)
97 MD4_CTX *context; /* 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
113 void MD4Update (context, in, inputLen)
114 MD4_CTX *context; /* context */
115 const void *in; /* input block */
116 unsigned int inputLen; /* length of input block */
118 unsigned int i, idx, partLen;
119 const unsigned char *input = in;
121 /* Compute number of bytes mod 64 */
122 idx = (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);
130 /* Transform as many times as possible.
132 if (inputLen >= partLen) {
134 ((POINTER)&context->buffer[idx], (CONST_POINTER)input, partLen);
135 MD4Transform (context->state, context->buffer);
137 for (i = partLen; i + 63 < inputLen; i += 64)
138 MD4Transform (context->state, &input[i]);
145 /* Buffer remaining input */
147 ((POINTER)&context->buffer[idx], (CONST_POINTER)&input[i],
152 void MD4Pad (context)
153 MD4_CTX *context; /* context */
155 unsigned char bits[8];
156 unsigned int idx, padLen;
158 /* Save number of bits */
159 Encode (bits, context->count, 8);
161 /* Pad out to 56 mod 64.
163 idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
164 padLen = (idx < 56) ? (56 - idx) : (120 - idx);
165 MD4Update (context, PADDING, padLen);
167 /* Append length (before padding) */
168 MD4Update (context, bits, 8);
171 /* MD4 finalization. Ends an MD4 message-digest operation, writing the
172 the message digest and zeroizing the context.
174 void MD4Final (digest, context)
175 unsigned char digest[16]; /* message digest */
176 MD4_CTX *context; /* context */
181 /* Store state in digest */
182 Encode (digest, context->state, 16);
184 /* Zeroize sensitive information.
186 explicit_bzero(context, sizeof(*context));
189 /* MD4 basic transformation. Transforms state based on block.
191 static void MD4Transform (state, block)
193 const unsigned char block[64];
195 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
197 Decode (x, block, 64);
200 FF (a, b, c, d, x[ 0], S11); /* 1 */
201 FF (d, a, b, c, x[ 1], S12); /* 2 */
202 FF (c, d, a, b, x[ 2], S13); /* 3 */
203 FF (b, c, d, a, x[ 3], S14); /* 4 */
204 FF (a, b, c, d, x[ 4], S11); /* 5 */
205 FF (d, a, b, c, x[ 5], S12); /* 6 */
206 FF (c, d, a, b, x[ 6], S13); /* 7 */
207 FF (b, c, d, a, x[ 7], S14); /* 8 */
208 FF (a, b, c, d, x[ 8], S11); /* 9 */
209 FF (d, a, b, c, x[ 9], S12); /* 10 */
210 FF (c, d, a, b, x[10], S13); /* 11 */
211 FF (b, c, d, a, x[11], S14); /* 12 */
212 FF (a, b, c, d, x[12], S11); /* 13 */
213 FF (d, a, b, c, x[13], S12); /* 14 */
214 FF (c, d, a, b, x[14], S13); /* 15 */
215 FF (b, c, d, a, x[15], S14); /* 16 */
218 GG (a, b, c, d, x[ 0], S21); /* 17 */
219 GG (d, a, b, c, x[ 4], S22); /* 18 */
220 GG (c, d, a, b, x[ 8], S23); /* 19 */
221 GG (b, c, d, a, x[12], S24); /* 20 */
222 GG (a, b, c, d, x[ 1], S21); /* 21 */
223 GG (d, a, b, c, x[ 5], S22); /* 22 */
224 GG (c, d, a, b, x[ 9], S23); /* 23 */
225 GG (b, c, d, a, x[13], S24); /* 24 */
226 GG (a, b, c, d, x[ 2], S21); /* 25 */
227 GG (d, a, b, c, x[ 6], S22); /* 26 */
228 GG (c, d, a, b, x[10], S23); /* 27 */
229 GG (b, c, d, a, x[14], S24); /* 28 */
230 GG (a, b, c, d, x[ 3], S21); /* 29 */
231 GG (d, a, b, c, x[ 7], S22); /* 30 */
232 GG (c, d, a, b, x[11], S23); /* 31 */
233 GG (b, c, d, a, x[15], S24); /* 32 */
236 HH (a, b, c, d, x[ 0], S31); /* 33 */
237 HH (d, a, b, c, x[ 8], S32); /* 34 */
238 HH (c, d, a, b, x[ 4], S33); /* 35 */
239 HH (b, c, d, a, x[12], S34); /* 36 */
240 HH (a, b, c, d, x[ 2], S31); /* 37 */
241 HH (d, a, b, c, x[10], S32); /* 38 */
242 HH (c, d, a, b, x[ 6], S33); /* 39 */
243 HH (b, c, d, a, x[14], S34); /* 40 */
244 HH (a, b, c, d, x[ 1], S31); /* 41 */
245 HH (d, a, b, c, x[ 9], S32); /* 42 */
246 HH (c, d, a, b, x[ 5], S33); /* 43 */
247 HH (b, c, d, a, x[13], S34); /* 44 */
248 HH (a, b, c, d, x[ 3], S31); /* 45 */
249 HH (d, a, b, c, x[11], S32); /* 46 */
250 HH (c, d, a, b, x[ 7], S33); /* 47 */
251 HH (b, c, d, a, x[15], S34); /* 48 */
258 /* Zeroize sensitive information.
260 memset ((POINTER)x, 0, sizeof (x));
263 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
266 static void Encode (output, input, len)
267 unsigned char *output;
273 for (i = 0, j = 0; j < len; i++, j += 4) {
274 output[j] = (unsigned char)(input[i] & 0xff);
275 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
276 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
277 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
281 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
284 static void Decode (output, input, len)
287 const unsigned char *input;
292 for (i = 0, j = 0; j < len; i++, j += 4)
293 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
294 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
298 /* When building libmd, provide weak references. Note: this is not
299 activated in the context of compiling these sources for internal
303 __weak_reference(_libmd_MD4Init, MD4Init);
305 __weak_reference(_libmd_MD4Update, MD4Update);
307 __weak_reference(_libmd_MD4Pad, MD4Pad);
309 __weak_reference(_libmd_MD4Final, MD4Final);