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1.1 root 1: /* GLOBAL.H - RSAREF types and constants */
2:
3: #include <string.h>
4:
5: /* POINTER defines a generic pointer type */
6: typedef unsigned char *POINTER;
7:
8: /* UINT2 defines a two byte word */
9: typedef unsigned short int UINT2;
10:
11: /* UINT4 defines a four byte word */
12: typedef unsigned long int UINT4;
13:
14:
15: /* MD4.H - header file for MD4C.C */
16:
17: /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991.
18:
19: All rights reserved.
20:
21: License to copy and use this software is granted provided that it is identified as the �RSA Data Security, Inc. MD4 Message-Digest Algorithm� in all material mentioning or referencing this software or this function.
22: License is also granted to make and use derivative works provided that such works are identified as �derived from the RSA Data Security, Inc. MD4 Message-Digest Algorithm� in all material mentioning or referencing the derived work.
23: RSA Data Security, Inc. makes no representations concerning either the merchantability of this software or the suitability of this software for any particular purpose. It is provided �as is� without express or implied warranty of any kind.
24:
25: These notices must be retained in any copies of any part of this documentation and/or software. */
26:
27: /* MD4 context. */
28: typedef struct {
29: UINT4 state[4]; /* state (ABCD) */
30: UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) */
31: unsigned char buffer[64]; /* input buffer */
32: } MD4_CTX;
33:
34: void MD4Init (MD4_CTX *);
35: void MD4Update (MD4_CTX *, unsigned char *, unsigned int);
36: void MD4Final (unsigned char [16], MD4_CTX *);
37:
38:
39:
40: /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm */
41: /* Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
42:
43: License to copy and use this software is granted provided that it is identified as the
44: RSA Data Security, Inc. MD4 Message-Digest Algorithm
45: in all material mentioning or referencing this software or this function.
46: License is also granted to make and use derivative works provided that such works are identified as
47: derived from the RSA Data Security, Inc. MD4 Message-Digest Algorithm
48: in all material mentioning or referencing the derived work.
49: RSA Data Security, Inc. makes no representations concerning either the merchantability of this software or the suitability of this software for any particular purpose. It is provided
50: as is without express or implied warranty of any kind.
51:
52: These notices must be retained in any copies of any part of this documentation and/or software. */
53:
54: /* Constants for MD4Transform routine. */
55: #define S11 3
56: #define S12 7
57: #define S13 11
58: #define S14 19
59: #define S21 3
60: #define S22 5
61: #define S23 9
62: #define S24 13
63: #define S31 3
64: #define S32 9
65: #define S33 11
66: #define S34 15
67:
68: static void MD4Transform (UINT4 [4], unsigned char [64]);
69: static void Encode (unsigned char *, UINT4 *, unsigned int);
70: static void Decode (UINT4 *, unsigned char *, unsigned int);
71:
72: static unsigned char PADDING[64] = {
73: 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
74: };
75:
76: /* F, G and H are basic MD4 functions. */
77: #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
78: #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
79: #define H(x, y, z) ((x) ^ (y) ^ (z))
80:
81: /* ROTATE_LEFT rotates x left n bits. */
82: #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
83:
84: /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
85: /* Rotation is separate from addition to prevent recomputation */
86: #define FF(a, b, c, d, x, s) {(a) += F ((b), (c), (d)) + (x); (a) = ROTATE_LEFT ((a), (s));}
87:
88: #define GG(a, b, c, d, x, s) {(a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; (a) = ROTATE_LEFT ((a), (s));}
89:
90: #define HH(a, b, c, d, x, s) {(a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; (a) = ROTATE_LEFT ((a), (s));}
91:
92:
93: /* MD4 initialization. Begins an MD4 operation, writing a new context. */
94: void MD4Init (MD4_CTX *context)
95: {
96: context->count[0] = context->count[1] = 0;
97:
98: /* Load magic initialization constants.*/
99: context->state[0] = 0x67452301;
100: context->state[1] = 0xefcdab89;
101: context->state[2] = 0x98badcfe;
102: context->state[3] = 0x10325476;
103: }
104:
105: /* MD4 block update operation. Continues an MD4 message-digest operation, processing another message block, and updating the context. */
106: void MD4Update (MD4_CTX *context, unsigned char *input, unsigned int inputLen)
107: {
108: unsigned int i, index, partLen;
109:
110: /* Compute number of bytes mod 64 */
111: index = (unsigned int)((context->count[0] >> 3) & 0x3F);
112:
113: /* Update number of bits */
114: if ((context->count[0] += ((UINT4)inputLen << 3))< ((UINT4)inputLen << 3))
115: context->count[1]++;
116:
117: context->count[1] += ((UINT4)inputLen >> 29);
118:
119: partLen = 64 - index;
120:
121: /* Transform as many times as possible.*/
122: if (inputLen >= partLen)
123: {
124: memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
125: MD4Transform (context->state, context->buffer);
126:
127: for (i = partLen; i + 63 < inputLen; i += 64)
128: MD4Transform (context->state, &input[i]);
129:
130: index = 0;
131: }
132: else
133: i = 0;
134:
135: /* Buffer remaining input */
136: memcpy ((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
137: }
138:
139:
140: /* MD4 finalization. Ends an MD4 message-digest operation, writing the the message digest and zeroizing the context. */
141: void MD4Final (unsigned char digest[16], MD4_CTX *context)
142: {
143: unsigned char bits[8];
144: unsigned int index, padLen;
145:
146: /* Save number of bits */
147: Encode (bits, context->count, 8);
148:
149: /* Pad out to 56 mod 64.*/
150: index = (unsigned int)((context->count[0] >> 3) & 0x3f);
151: padLen = (index < 56) ? (56 - index) : (120 - index);
152: MD4Update (context, PADDING, padLen);
153:
154: /* Append length (before padding) */
155: MD4Update (context, bits, 8);
156:
157: /* Store state in digest */
158: Encode (digest, context->state, 16);
159:
160: /* Zeroize sensitive information.*/
161: memset ((POINTER)context, 0, sizeof (*context));
162: }
163:
164:
165: /* MD4 basic transformation. Transforms state based on block. */
166: static void MD4Transform (UINT4 state[4], unsigned char block[64])
167: {
168: UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
169:
170: Decode (x, block, 64);
171:
172: /* Round 1 */
173: FF (a, b, c, d, x[ 0], S11); /* 1 */
174: FF (d, a, b, c, x[ 1], S12); /* 2 */
175: FF (c, d, a, b, x[ 2], S13); /* 3 */
176: FF (b, c, d, a, x[ 3], S14); /* 4 */
177: FF (a, b, c, d, x[ 4], S11); /* 5 */
178: FF (d, a, b, c, x[ 5], S12); /* 6 */
179: FF (c, d, a, b, x[ 6], S13); /* 7 */
180: FF (b, c, d, a, x[ 7], S14); /* 8 */
181: FF (a, b, c, d, x[ 8], S11); /* 9 */
182: FF (d, a, b, c, x[ 9], S12); /* 10 */
183: FF (c, d, a, b, x[10], S13); /* 11 */
184: FF (b, c, d, a, x[11], S14); /* 12 */
185: FF (a, b, c, d, x[12], S11); /* 13 */
186: FF (d, a, b, c, x[13], S12); /* 14 */
187: FF (c, d, a, b, x[14], S13); /* 15 */
188: FF (b, c, d, a, x[15], S14); /* 16 */
189:
190: /* Round 2 */
191: GG (a, b, c, d, x[ 0], S21); /* 17 */
192: GG (d, a, b, c, x[ 4], S22); /* 18 */
193: GG (c, d, a, b, x[ 8], S23); /* 19 */
194: GG (b, c, d, a, x[12], S24); /* 20 */
195: GG (a, b, c, d, x[ 1], S21); /* 21 */
196: GG (d, a, b, c, x[ 5], S22); /* 22 */
197: GG (c, d, a, b, x[ 9], S23); /* 23 */
198: GG (b, c, d, a, x[13], S24); /* 24 */
199: GG (a, b, c, d, x[ 2], S21); /* 25 */
200: GG (d, a, b, c, x[ 6], S22); /* 26 */
201: GG (c, d, a, b, x[10], S23); /* 27 */
202: GG (b, c, d, a, x[14], S24); /* 28 */
203: GG (a, b, c, d, x[ 3], S21); /* 29 */
204: GG (d, a, b, c, x[ 7], S22); /* 30 */
205: GG (c, d, a, b, x[11], S23); /* 31 */
206: GG (b, c, d, a, x[15], S24); /* 32 */
207:
208: /* Round 3 */
209: HH (a, b, c, d, x[ 0], S31); /* 33 */
210: HH (d, a, b, c, x[ 8], S32); /* 34 */
211: HH (c, d, a, b, x[ 4], S33); /* 35 */
212: HH (b, c, d, a, x[12], S34); /* 36 */
213: HH (a, b, c, d, x[ 2], S31); /* 37 */
214: HH (d, a, b, c, x[10], S32); /* 38 */
215: HH (c, d, a, b, x[ 6], S33); /* 39 */
216: HH (b, c, d, a, x[14], S34); /* 40 */
217: HH (a, b, c, d, x[ 1], S31); /* 41 */
218: HH (d, a, b, c, x[ 9], S32); /* 42 */
219: HH (c, d, a, b, x[ 5], S33); /* 43 */
220: HH (b, c, d, a, x[13], S34); /* 44 */
221: HH (a, b, c, d, x[ 3], S31); /* 45 */
222: HH (d, a, b, c, x[11], S32); /* 46 */
223: HH (c, d, a, b, x[ 7], S33); /* 47 */
224: HH (b, c, d, a, x[15], S34); /* 48 */
225:
226: state[0] += a;
227: state[1] += b;
228: state[2] += c;
229: state[3] += d;
230:
231: /* Zeroize sensitive information.*/
232: memset ((POINTER)x, 0, sizeof (x));
233: }
234:
235:
236: /* Encodes input (UINT4) into output (unsigned char). Assumes len is a multiple of 4. */
237: static void Encode (unsigned char *output, UINT4 *input, unsigned int len)
238: {
239: unsigned int i, j;
240:
241: for (i = 0, j = 0; j < len; i++, j += 4) {
242: output[j] = (unsigned char)(input[i] & 0xff);
243: output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
244: output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
245: output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
246: }
247: }
248:
249:
250: /* Decodes input (unsigned char) into output (UINT4). Assumes len is a multiple of 4. */
251: static void Decode (UINT4 *output, unsigned char *input, unsigned int len)
252: {
253: unsigned int i, j;
254:
255: for (i = 0, j = 0; j < len; i++, j += 4)
256: output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
257: }
258:
259: //===================================================================
260:
261: unsigned Com_BlockChecksum (void *buffer, int length)
262: {
263: int digest[4];
264: unsigned val;
265: MD4_CTX ctx;
266:
267: MD4Init (&ctx);
268: MD4Update (&ctx, (unsigned char *)buffer, length);
269: MD4Final ( (unsigned char *)digest, &ctx);
270:
271: val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
272:
273: return val;
274: }
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