Annotation of embedaddon/lighttpd/src/md5.c, revision 1.1.1.1
1.1 misho 1: /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
2: */
3:
4: /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
5: rights reserved.
6:
7: License to copy and use this software is granted provided that it
8: is identified as the "RSA Data Security, Inc. MD5 Message-Digest
9: Algorithm" in all material mentioning or referencing this software
10: or this function.
11:
12: License is also granted to make and use derivative works provided
13: that such works are identified as "derived from the RSA Data
14: Security, Inc. MD5 Message-Digest Algorithm" in all material
15: mentioning or referencing the derived work.
16:
17: RSA Data Security, Inc. makes no representations concerning either
18: the merchantability of this software or the suitability of this
19: software for any particular purpose. It is provided "as is"
20: without express or implied warranty of any kind.
21:
22: These notices must be retained in any copies of any part of this
23: documentation and/or software.
24: */
25:
26: #ifdef HAVE_CONFIG_H
27: # include "config.h"
28: #endif
29:
30: #ifndef USE_OPENSSL
31: #include <string.h>
32:
33: #include "md5.h"
34:
35: /* Constants for MD5Transform routine.
36: */
37:
38: #define S11 7
39: #define S12 12
40: #define S13 17
41: #define S14 22
42: #define S21 5
43: #define S22 9
44: #define S23 14
45: #define S24 20
46: #define S31 4
47: #define S32 11
48: #define S33 16
49: #define S34 23
50: #define S41 6
51: #define S42 10
52: #define S43 15
53: #define S44 21
54:
55: static void li_MD5Transform (UINT4 [4], const unsigned char [64]);
56: static void Encode (unsigned char *, UINT4 *, unsigned int);
57: static void Decode (UINT4 *, const unsigned char *, unsigned int);
58:
59: #ifdef HAVE_MEMCPY
60: #define MD5_memcpy(output, input, len) memcpy((output), (input), (len))
61: #else
62: static void MD5_memcpy (POINTER, POINTER, unsigned int);
63: #endif
64: #ifdef HAVE_MEMSET
65: #define MD5_memset(output, value, len) memset((output), (value), (len))
66: #else
67: static void MD5_memset (POINTER, int, unsigned int);
68: #endif
69:
70: static unsigned char PADDING[64] = {
71: 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
72: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
73: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
74: };
75:
76: /* F, G, H and I are basic MD5 functions.
77: */
78: #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
79: #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
80: #define H(x, y, z) ((x) ^ (y) ^ (z))
81: #define I(x, y, z) ((y) ^ ((x) | (~z)))
82:
83: /* ROTATE_LEFT rotates x left n bits.
84: */
85: #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
86:
87: /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
88: Rotation is separate from addition to prevent recomputation.
89: */
90: #define FF(a, b, c, d, x, s, ac) { \
91: (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
92: (a) = ROTATE_LEFT ((a), (s)); \
93: (a) += (b); \
94: }
95: #define GG(a, b, c, d, x, s, ac) { \
96: (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
97: (a) = ROTATE_LEFT ((a), (s)); \
98: (a) += (b); \
99: }
100: #define HH(a, b, c, d, x, s, ac) { \
101: (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
102: (a) = ROTATE_LEFT ((a), (s)); \
103: (a) += (b); \
104: }
105: #define II(a, b, c, d, x, s, ac) { \
106: (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
107: (a) = ROTATE_LEFT ((a), (s)); \
108: (a) += (b); \
109: }
110:
111: /* MD5 initialization. Begins an MD5 operation, writing a new context.
112: */
113: void li_MD5_Init (li_MD5_CTX *context)
114: {
115: context->count[0] = context->count[1] = 0;
116: /* Load magic initialization constants.
117: */
118: context->state[0] = 0x67452301;
119: context->state[1] = 0xefcdab89;
120: context->state[2] = 0x98badcfe;
121: context->state[3] = 0x10325476;
122: }
123:
124: /* MD5 block update operation. Continues an MD5 message-digest
125: operation, processing another message block, and updating the
126: context.
127: */
128: void li_MD5_Update (li_MD5_CTX *context, const void *_input, unsigned int inputLen)
129: {
130: unsigned int i, ndx, partLen;
131: const unsigned char *input = (const unsigned char*) _input;
132:
133: /* Compute number of bytes mod 64 */
134: ndx = (unsigned int)((context->count[0] >> 3) & 0x3F);
135:
136: /* Update number of bits */
137: if ((context->count[0] += ((UINT4)inputLen << 3))
138:
139: < ((UINT4)inputLen << 3))
140: context->count[1]++;
141: context->count[1] += ((UINT4)inputLen >> 29);
142:
143: partLen = 64 - ndx;
144:
145: /* Transform as many times as possible.
146: */
147: if (inputLen >= partLen) {
148: MD5_memcpy
149: ((POINTER)&context->buffer[ndx], (POINTER)input, partLen);
150: li_MD5Transform (context->state, context->buffer);
151:
152: for (i = partLen; i + 63 < inputLen; i += 64)
153: li_MD5Transform (context->state, &input[i]);
154:
155: ndx = 0;
156: }
157: else
158: i = 0;
159:
160: /* Buffer remaining input */
161: MD5_memcpy
162: ((POINTER)&context->buffer[ndx], (POINTER)&input[i],
163: inputLen-i);
164: }
165:
166: /* MD5 finalization. Ends an MD5 message-digest operation, writing the
167: the message digest and zeroizing the context.
168: */
169: void li_MD5_Final (unsigned char digest[16], li_MD5_CTX *context)
170: {
171: unsigned char bits[8];
172: unsigned int ndx, padLen;
173:
174: /* Save number of bits */
175: Encode (bits, context->count, 8);
176:
177: /* Pad out to 56 mod 64.
178: */
179: ndx = (unsigned int)((context->count[0] >> 3) & 0x3f);
180: padLen = (ndx < 56) ? (56 - ndx) : (120 - ndx);
181: li_MD5_Update (context, PADDING, padLen);
182:
183: /* Append length (before padding) */
184: li_MD5_Update (context, bits, 8);
185:
186: /* Store state in digest */
187: Encode (digest, context->state, 16);
188:
189: /* Zeroize sensitive information.
190: */
191: MD5_memset ((POINTER)context, 0, sizeof (*context));
192: }
193:
194: /* MD5 basic transformation. Transforms state based on block.
195: */
196: static void li_MD5Transform (UINT4 state[4], const unsigned char block[64])
197: {
198: UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
199:
200: Decode (x, block, 64);
201:
202: /* Round 1 */
203: FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
204: FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
205: FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
206: FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
207: FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
208: FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
209: FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
210: FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
211: FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
212: FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
213: FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
214: FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
215: FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
216: FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
217: FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
218: FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
219:
220: /* Round 2 */
221: GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
222: GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
223: GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
224: GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
225: GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
226: GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
227: GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
228: GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
229: GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
230: GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
231: GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
232:
233: GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
234: GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
235: GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
236: GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
237: GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
238:
239: /* Round 3 */
240: HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
241: HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
242: HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
243: HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
244: HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
245: HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
246: HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
247: HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
248: HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
249: HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
250: HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
251: HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
252: HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
253: HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
254: HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
255: HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
256:
257: /* Round 4 */
258: II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
259: II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
260: II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
261: II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
262: II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
263: II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
264: II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
265: II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
266: II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
267: II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
268: II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
269: II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
270: II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
271: II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
272: II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
273: II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
274:
275: state[0] += a;
276: state[1] += b;
277: state[2] += c;
278: state[3] += d;
279:
280: /* Zeroize sensitive information.
281:
282: */
283: MD5_memset ((POINTER)x, 0, sizeof (x));
284: }
285:
286: /* Encodes input (UINT4) into output (unsigned char). Assumes len is
287: a multiple of 4.
288: */
289: static void Encode (unsigned char *output, UINT4 *input, unsigned int len)
290: {
291: unsigned int i, j;
292:
293: for (i = 0, j = 0; j < len; i++, j += 4) {
294: output[j] = (unsigned char)(input[i] & 0xff);
295: output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
296: output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
297: output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
298: }
299: }
300:
301: /* Decodes input (unsigned char) into output (UINT4). Assumes len is
302: a multiple of 4.
303: */
304: static void Decode (UINT4 *output, const unsigned char *input, unsigned int len)
305: {
306: unsigned int i, j;
307:
308: for (i = 0, j = 0; j < len; i++, j += 4)
309: output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
310: (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
311: }
312:
313: /* Note: Replace "for loop" with standard memcpy if possible.
314: */
315: #ifndef HAVE_MEMCPY
316: static void MD5_memcpy (POINTER output, POINTER input, unsigned int len)
317: {
318: unsigned int i;
319:
320: for (i = 0; i < len; i++)
321:
322: output[i] = input[i];
323: }
324: #endif
325: /* Note: Replace "for loop" with standard memset if possible.
326: */
327: #ifndef HAVE_MEMSET
328: static void MD5_memset (POINTER output, int value, unsigned int len)
329: {
330: unsigned int i;
331:
332: for (i = 0; i < len; i++)
333: ((char *)output)[i] = (char)value;
334: }
335: #endif
336: #endif
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