1 /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm
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/types.h>
32 typedef unsigned char *POINTER;
33 typedef const unsigned char *CONST_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.
93 void MD4Init (context)
94 MD4_CTX *context; /* 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
110 void MD4Update (context, input, inputLen)
111 MD4_CTX *context; /* context */
112 const unsigned char *input; /* input block */
113 unsigned int inputLen; /* length of input block */
115 unsigned int i, idx, partLen;
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],
148 void MD4Pad (context)
149 MD4_CTX *context; /* 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.
170 void MD4Final (digest, context)
171 unsigned char digest[16]; /* message digest */
172 MD4_CTX *context; /* context */
177 /* Store state in digest */
178 Encode (digest, context->state, 16);
180 /* Zeroize sensitive information.
182 memset ((POINTER)context, 0, sizeof (*context));
185 /* MD4 basic transformation. Transforms state based on block.
187 static void MD4Transform (state, block)
189 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
262 static void Encode (output, input, len)
263 unsigned char *output;
269 for (i = 0, j = 0; j < len; i++, j += 4) {
270 output[j] = (unsigned char)(input[i] & 0xff);
271 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
272 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
273 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
277 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
280 static void Decode (output, input, len)
283 const unsigned char *input;
288 for (i = 0, j = 0; j < len; i++, j += 4)
289 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
290 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);