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1.1 root 1: /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
2: */
3:
4: /* Copyright (C) 1991, RSA Data Security, Inc. All rights reserved.
5:
6: License to copy and use this software is granted provided that it
7: is identified as the "RSA Data Security, Inc. MD5 Message-Digest
8: Algorithm" in all material mentioning or referencing this software
9: or this function.
10:
11: License is also granted to make and use derivative works provided
12: that such works are identified as "derived from the RSA Data
13: Security, Inc. MD5 Message-Digest Algorithm" in all material
14: mentioning or referencing the derived work.
15:
16: RSA Data Security, Inc. makes no representations concerning either
17: the merchantability of this software or the suitability of this
18: software for any particular purpose. It is provided "as is"
19: without express or implied warranty of any kind.
20:
21: These notices must be retained in any copies of any part of this
22: documentation and/or software.
23: */
24:
25: #include "global.h"
26: #include "md5.h"
27:
28: /* Constants for MD5Transform routine.
29: */
30: #define S11 7
31: #define S12 12
32: #define S13 17
33: #define S14 22
34: #define S21 5
35: #define S22 9
36: #define S23 14
37: #define S24 20
38: #define S31 4
39: #define S32 11
40: #define S33 16
41: #define S34 23
42: #define S41 6
43: #define S42 10
44: #define S43 15
45: #define S44 21
46:
47: static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
48: static void Encode PROTO_LIST ((unsigned char *, UINT4 *, unsigned int));
49: static void Decode PROTO_LIST ((UINT4 *, unsigned char *, unsigned int));
50: static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
51: static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
52:
53: static unsigned char PADDING[64] = {
54: 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
55: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
56: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
57: };
58:
59: /* F, G, H and I are basic MD5 functions.
60: */
61: #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
62: #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
63: #define H(x, y, z) ((x) ^ (y) ^ (z))
64: #define I(x, y, z) ((y) ^ ((x) | (~z)))
65:
66: /* ROTATE_LEFT rotates x left n bits.
67: */
68: #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
69:
70: /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
71: Rotation is separate from addition to prevent recomputation.
72: */
73: #define FF(a, b, c, d, x, s, ac) { \
74: (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
75: (a) = ROTATE_LEFT ((a), (s)); \
76: (a) += (b); \
77: }
78: #define GG(a, b, c, d, x, s, ac) { \
79: (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
80: (a) = ROTATE_LEFT ((a), (s)); \
81: (a) += (b); \
82: }
83: #define HH(a, b, c, d, x, s, ac) { \
84: (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
85: (a) = ROTATE_LEFT ((a), (s)); \
86: (a) += (b); \
87: }
88: #define II(a, b, c, d, x, s, ac) { \
89: (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
90: (a) = ROTATE_LEFT ((a), (s)); \
91: (a) += (b); \
92: }
93:
94: /* MD5 initialization. Begins an MD5 operation, writing a new context.
95: */
96: void MD5Init (context)
97: MD5_CTX *context; /* context */
98: {
99: context->count[0] = context->count[1] = 0;
100:
101: /* Load magic initialization constants.
102: */
103: context->state[0] = 0x67452301;
104: context->state[1] = 0xefcdab89;
105: context->state[2] = 0x98badcfe;
106: context->state[3] = 0x10325476;
107: }
108:
109: /* MD5 block update operation. Continues an MD5 message-digest operation,
110: processing another message block, and updating the context.
111: */
112: void MD5Update (context, input, inputLen)
113: MD5_CTX *context; /* context */
114: unsigned char *input; /* input block */
115: unsigned int inputLen; /* length of input block */
116: {
117: unsigned int i, index, partLen;
118:
119: /* Compute number of bytes mod 64 */
120: index = (unsigned int)((context->count[0] >> 3) & 0x3F);
121:
122: /* Update number of bits */
123: if ((context->count[0] += ((UINT4)inputLen << 3)) < ((UINT4)inputLen << 3))
124: context->count[1]++;
125: context->count[1] += ((UINT4)inputLen >> 29);
126:
127: partLen = 64 - index;
128:
129: /* Transform as many times as possible.
130: */
131: if (inputLen >= partLen) {
132: MD5_memcpy ((POINTER)&context->buffer[index], (POINTER)input, partLen);
133: MD5Transform (context->state, context->buffer);
134:
135: for (i = partLen; i + 63 < inputLen; i += 64)
136: MD5Transform (context->state, &input[i]);
137:
138: index = 0;
139: }
140: else
141: i = 0;
142:
143: /* Buffer remaining input */
144: MD5_memcpy
145: ((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
146: }
147:
148: /* MD5 finalization. Ends an MD5 message-digest operation, writing the
149: the message digest and zeroizing the context.
150: */
151: void MD5Final (digest, context)
152: unsigned char digest[16]; /* message digest */
153: MD5_CTX *context; /* context */
154: {
155: unsigned char bits[8];
156: unsigned int index, padLen;
157:
158: /* Save number of bits */
159: Encode (bits, context->count, 8);
160:
161: /* Pad out to 56 mod 64.
162: */
163: index = (unsigned int)((context->count[0] >> 3) & 0x3f);
164: padLen = (index < 56) ? (56 - index) : (120 - index);
165: MD5Update (context, PADDING, padLen);
166:
167: /* Append length (before padding) */
168: MD5Update (context, bits, 8);
169:
170: /* Store state in digest */
171: Encode (digest, context->state, 16);
172:
173: /* Zeroize sensitive information.
174: */
175: MD5_memset ((POINTER)context, 0, sizeof (*context));
176: }
177:
178: /* MD5 basic transformation. Transforms state based on block.
179: */
180: static void MD5Transform (state, block)
181: UINT4 state[4];
182: unsigned char block[64];
183: {
184: UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
185:
186: Decode (x, block, 64);
187:
188: /* Round 1 */
189: FF ( a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
190: FF ( d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
191: FF ( c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
192: FF ( b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
193: FF ( a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
194: FF ( d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
195: FF ( c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
196: FF ( b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
197: FF ( a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
198: FF ( d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
199: FF ( c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
200: FF ( b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
201: FF ( a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
202: FF ( d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
203: FF ( c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
204: FF ( b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
205:
206: /* Round 2 */
207: GG ( a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
208: GG ( d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
209: GG ( c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
210: GG ( b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
211: GG ( a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
212: GG ( d, a, b, c, x[10], S22, 0x2441453); /* 22 */
213: GG ( c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
214: GG ( b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
215: GG ( a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
216: GG ( d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
217: GG ( c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
218: GG ( b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
219: GG ( a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
220: GG ( d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
221: GG ( c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
222: GG ( b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
223:
224: /* Round 3 */
225: HH ( a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
226: HH ( d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
227: HH ( c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
228: HH ( b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
229: HH ( a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
230: HH ( d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
231: HH ( c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
232: HH ( b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
233: HH ( a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
234: HH ( d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
235: HH ( c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
236: HH ( b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
237: HH ( a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
238: HH ( d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
239: HH ( c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
240: HH ( b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
241:
242: /* Round 4 */
243: II ( a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
244: II ( d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
245: II ( c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
246: II ( b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
247: II ( a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
248: II ( d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
249: II ( c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
250: II ( b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
251: II ( a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
252: II ( d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
253: II ( c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
254: II ( b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
255: II ( a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
256: II ( d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
257: II ( c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
258: II ( b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
259:
260: state[0] += a;
261: state[1] += b;
262: state[2] += c;
263: state[3] += d;
264:
265: /* Zeroize sensitive information.
266: */
267: MD5_memset ((POINTER)x, 0, sizeof (x));
268: }
269:
270: /* Encodes input (UINT4) into output (unsigned char). Assumes len is
271: a multiple of 4.
272: */
273: static void Encode (output, input, len)
274: unsigned char *output;
275: UINT4 *input;
276: unsigned int len;
277: {
278: unsigned int i, j;
279:
280: for (i = 0, j = 0; j < len; i++, j += 4) {
281: output[j] = (unsigned char)(input[i] & 0xff);
282: output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
283: output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
284: output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
285: }
286: }
287:
288: /* Decodes input (unsigned char) into output (UINT4). Assumes len is
289: a multiple of 4.
290: */
291: static void Decode (output, input, len)
292: UINT4 *output;
293: unsigned char *input;
294: unsigned int len;
295: {
296: unsigned int i, j;
297:
298: for (i = 0, j = 0; j < len; i++, j += 4)
299: output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
300: (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
301: }
302:
303: /* Note: Replace "for loop" with standard memcpy if possible.
304: */
305: static void MD5_memcpy (output, input, len)
306: POINTER output;
307: POINTER input;
308: unsigned int len;
309: {
310: unsigned int i;
311:
312: for (i = 0; i < len; i++)
313: output[i] = input[i];
314: }
315:
316: /* Note: Replace "for loop" with standard memset if possible.
317: */
318: static void MD5_memset (output, value, len)
319: POINTER output;
320: int value;
321: unsigned int len;
322: {
323: unsigned int i;
324:
325: for (i = 0; i < len; i++)
326: ((char *)output)[i] = (char)value;
327: }
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