![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to md4.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Quake II] / quake2 / qcommon|
Return to md4.c CVS log | Up to [Quake II] / quake2 / qcommon |
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 */
1.1.1.2 ! root 12: #ifdef __alpha__
! 13: typedef unsigned int UINT4;
! 14: #else
1.1 root 15: typedef unsigned long int UINT4;
1.1.1.2 ! root 16: #endif
1.1 root 17:
18:
19: /* MD4.H - header file for MD4C.C */
20:
21: /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991.
22:
23: All rights reserved.
24:
25: 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.
26: 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.
27: 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.
28:
29: These notices must be retained in any copies of any part of this documentation and/or software. */
30:
31: /* MD4 context. */
32: typedef struct {
33: UINT4 state[4]; /* state (ABCD) */
34: UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) */
35: unsigned char buffer[64]; /* input buffer */
36: } MD4_CTX;
37:
38: void MD4Init (MD4_CTX *);
39: void MD4Update (MD4_CTX *, unsigned char *, unsigned int);
40: void MD4Final (unsigned char [16], MD4_CTX *);
41:
42:
43:
44: /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm */
45: /* Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
46:
47: License to copy and use this software is granted provided that it is identified as the
48: RSA Data Security, Inc. MD4 Message-Digest Algorithm
49: in all material mentioning or referencing this software or this function.
50: License is also granted to make and use derivative works provided that such works are identified as
51: derived from the RSA Data Security, Inc. MD4 Message-Digest Algorithm
52: in all material mentioning or referencing the derived work.
53: 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
54: as is without express or implied warranty of any kind.
55:
56: These notices must be retained in any copies of any part of this documentation and/or software. */
57:
58: /* Constants for MD4Transform routine. */
59: #define S11 3
60: #define S12 7
61: #define S13 11
62: #define S14 19
63: #define S21 3
64: #define S22 5
65: #define S23 9
66: #define S24 13
67: #define S31 3
68: #define S32 9
69: #define S33 11
70: #define S34 15
71:
72: static void MD4Transform (UINT4 [4], unsigned char [64]);
73: static void Encode (unsigned char *, UINT4 *, unsigned int);
74: static void Decode (UINT4 *, unsigned char *, unsigned int);
75:
76: static unsigned char PADDING[64] = {
77: 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
78: };
79:
80: /* F, G and H are basic MD4 functions. */
81: #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
82: #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
83: #define H(x, y, z) ((x) ^ (y) ^ (z))
84:
85: /* ROTATE_LEFT rotates x left n bits. */
86: #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
87:
88: /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
89: /* Rotation is separate from addition to prevent recomputation */
90: #define FF(a, b, c, d, x, s) {(a) += F ((b), (c), (d)) + (x); (a) = ROTATE_LEFT ((a), (s));}
91:
92: #define GG(a, b, c, d, x, s) {(a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; (a) = ROTATE_LEFT ((a), (s));}
93:
94: #define HH(a, b, c, d, x, s) {(a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; (a) = ROTATE_LEFT ((a), (s));}
95:
96:
97: /* MD4 initialization. Begins an MD4 operation, writing a new context. */
98: void MD4Init (MD4_CTX *context)
99: {
100: context->count[0] = context->count[1] = 0;
101:
102: /* Load magic initialization constants.*/
103: context->state[0] = 0x67452301;
104: context->state[1] = 0xefcdab89;
105: context->state[2] = 0x98badcfe;
106: context->state[3] = 0x10325476;
107: }
108:
109: /* MD4 block update operation. Continues an MD4 message-digest operation, processing another message block, and updating the context. */
110: void MD4Update (MD4_CTX *context, unsigned char *input, unsigned int inputLen)
111: {
112: unsigned int i, index, partLen;
113:
114: /* Compute number of bytes mod 64 */
115: index = (unsigned int)((context->count[0] >> 3) & 0x3F);
116:
117: /* Update number of bits */
118: if ((context->count[0] += ((UINT4)inputLen << 3))< ((UINT4)inputLen << 3))
119: context->count[1]++;
120:
121: context->count[1] += ((UINT4)inputLen >> 29);
122:
123: partLen = 64 - index;
124:
125: /* Transform as many times as possible.*/
126: if (inputLen >= partLen)
127: {
128: memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
129: MD4Transform (context->state, context->buffer);
130:
131: for (i = partLen; i + 63 < inputLen; i += 64)
132: MD4Transform (context->state, &input[i]);
133:
134: index = 0;
135: }
136: else
137: i = 0;
138:
139: /* Buffer remaining input */
140: memcpy ((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
141: }
142:
143:
144: /* MD4 finalization. Ends an MD4 message-digest operation, writing the the message digest and zeroizing the context. */
145: void MD4Final (unsigned char digest[16], MD4_CTX *context)
146: {
147: unsigned char bits[8];
148: unsigned int index, padLen;
149:
150: /* Save number of bits */
151: Encode (bits, context->count, 8);
152:
153: /* Pad out to 56 mod 64.*/
154: index = (unsigned int)((context->count[0] >> 3) & 0x3f);
155: padLen = (index < 56) ? (56 - index) : (120 - index);
156: MD4Update (context, PADDING, padLen);
157:
158: /* Append length (before padding) */
159: MD4Update (context, bits, 8);
160:
161: /* Store state in digest */
162: Encode (digest, context->state, 16);
163:
164: /* Zeroize sensitive information.*/
165: memset ((POINTER)context, 0, sizeof (*context));
166: }
167:
168:
169: /* MD4 basic transformation. Transforms state based on block. */
170: static void MD4Transform (UINT4 state[4], unsigned char block[64])
171: {
172: UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
173:
174: Decode (x, block, 64);
175:
176: /* Round 1 */
177: FF (a, b, c, d, x[ 0], S11); /* 1 */
178: FF (d, a, b, c, x[ 1], S12); /* 2 */
179: FF (c, d, a, b, x[ 2], S13); /* 3 */
180: FF (b, c, d, a, x[ 3], S14); /* 4 */
181: FF (a, b, c, d, x[ 4], S11); /* 5 */
182: FF (d, a, b, c, x[ 5], S12); /* 6 */
183: FF (c, d, a, b, x[ 6], S13); /* 7 */
184: FF (b, c, d, a, x[ 7], S14); /* 8 */
185: FF (a, b, c, d, x[ 8], S11); /* 9 */
186: FF (d, a, b, c, x[ 9], S12); /* 10 */
187: FF (c, d, a, b, x[10], S13); /* 11 */
188: FF (b, c, d, a, x[11], S14); /* 12 */
189: FF (a, b, c, d, x[12], S11); /* 13 */
190: FF (d, a, b, c, x[13], S12); /* 14 */
191: FF (c, d, a, b, x[14], S13); /* 15 */
192: FF (b, c, d, a, x[15], S14); /* 16 */
193:
194: /* Round 2 */
195: GG (a, b, c, d, x[ 0], S21); /* 17 */
196: GG (d, a, b, c, x[ 4], S22); /* 18 */
197: GG (c, d, a, b, x[ 8], S23); /* 19 */
198: GG (b, c, d, a, x[12], S24); /* 20 */
199: GG (a, b, c, d, x[ 1], S21); /* 21 */
200: GG (d, a, b, c, x[ 5], S22); /* 22 */
201: GG (c, d, a, b, x[ 9], S23); /* 23 */
202: GG (b, c, d, a, x[13], S24); /* 24 */
203: GG (a, b, c, d, x[ 2], S21); /* 25 */
204: GG (d, a, b, c, x[ 6], S22); /* 26 */
205: GG (c, d, a, b, x[10], S23); /* 27 */
206: GG (b, c, d, a, x[14], S24); /* 28 */
207: GG (a, b, c, d, x[ 3], S21); /* 29 */
208: GG (d, a, b, c, x[ 7], S22); /* 30 */
209: GG (c, d, a, b, x[11], S23); /* 31 */
210: GG (b, c, d, a, x[15], S24); /* 32 */
211:
212: /* Round 3 */
213: HH (a, b, c, d, x[ 0], S31); /* 33 */
214: HH (d, a, b, c, x[ 8], S32); /* 34 */
215: HH (c, d, a, b, x[ 4], S33); /* 35 */
216: HH (b, c, d, a, x[12], S34); /* 36 */
217: HH (a, b, c, d, x[ 2], S31); /* 37 */
218: HH (d, a, b, c, x[10], S32); /* 38 */
219: HH (c, d, a, b, x[ 6], S33); /* 39 */
220: HH (b, c, d, a, x[14], S34); /* 40 */
221: HH (a, b, c, d, x[ 1], S31); /* 41 */
222: HH (d, a, b, c, x[ 9], S32); /* 42 */
223: HH (c, d, a, b, x[ 5], S33); /* 43 */
224: HH (b, c, d, a, x[13], S34); /* 44 */
225: HH (a, b, c, d, x[ 3], S31); /* 45 */
226: HH (d, a, b, c, x[11], S32); /* 46 */
227: HH (c, d, a, b, x[ 7], S33); /* 47 */
228: HH (b, c, d, a, x[15], S34); /* 48 */
229:
230: state[0] += a;
231: state[1] += b;
232: state[2] += c;
233: state[3] += d;
234:
235: /* Zeroize sensitive information.*/
236: memset ((POINTER)x, 0, sizeof (x));
237: }
238:
239:
240: /* Encodes input (UINT4) into output (unsigned char). Assumes len is a multiple of 4. */
241: static void Encode (unsigned char *output, UINT4 *input, unsigned int len)
242: {
243: unsigned int i, j;
244:
245: for (i = 0, j = 0; j < len; i++, j += 4) {
246: output[j] = (unsigned char)(input[i] & 0xff);
247: output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
248: output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
249: output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
250: }
251: }
252:
253:
254: /* Decodes input (unsigned char) into output (UINT4). Assumes len is a multiple of 4. */
255: static void Decode (UINT4 *output, unsigned char *input, unsigned int len)
256: {
257: unsigned int i, j;
258:
259: for (i = 0, j = 0; j < len; i++, j += 4)
260: output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
261: }
262:
263: //===================================================================
264:
265: unsigned Com_BlockChecksum (void *buffer, int length)
266: {
267: int digest[4];
268: unsigned val;
269: MD4_CTX ctx;
270:
271: MD4Init (&ctx);
272: MD4Update (&ctx, (unsigned char *)buffer, length);
273: MD4Final ( (unsigned char *)digest, &ctx);
274:
275: val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
276:
277: return val;
278: }
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.