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