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1/*␊
2 * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm␊
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 * $Id: md5c.c,v 1.1 2005/06/24 22:47:12 curtisg Exp $␊
26 *␊
27 * This code is the same as the code published by RSA Inc. It has been␊
28 * edited for clarity and style only.␊
29 */␊
30␊
31#include <sys/types.h>␊
32␊
33#ifdef KERNEL␊
34#include <sys/systm.h>␊
35#else␊
36#include <string.h>␊
37#endif␊
38␊
39#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5␊
40# include <Kernel/libkern/crypto/md5.h>␊
41#else␊
42# include <sys/md5.h>␊
43#endif␊
44␊
45␊
46#ifdef KERNEL␊
47#define memset(x,y,z)␉bzero(x,z);␊
48#define memcpy(x,y,z)␉bcopy(y, x, z)␊
49#endif␊
50␊
51#if defined(__i386__) || defined(__alpha__)␊
52#define Encode memcpy␊
53#define Decode memcpy␊
54#else /* __i386__ */␊
55static void Encode (output, input, len);␊
56static void Decode (output, input, len);␊
57static void MD5Transform (state, block);␊
58/*␊
59 * Encodes input (u_int32_t) into output (unsigned char). Assumes len is␊
60 * a multiple of 4.␊
61 */␊
62␊
63/* XXX not prototyped, and not compatible with memcpy(). */␊
64static void␊
65Encode (output, input, len)␊
66␉unsigned char *output;␊
67␉u_int32_t *input;␊
68␉unsigned int len;␊
69{␊
70␉unsigned int i, j;␊
71␊
72␉for (i = 0, j = 0; j < len; i++, j += 4) {␊
73␉␉output[j] = (unsigned char)(input[i] & 0xff);␊
74␉␉output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);␊
75␉␉output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);␊
76␉␉output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);␊
77␉}␊
78}␊
79␊
80/*␊
81 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is␊
82 * a multiple of 4.␊
83 */␊
84␊
85static void␊
86Decode (output, input, len)␊
87␉u_int32_t *output;␊
88␉const unsigned char *input;␊
89␉unsigned int len;␊
90{␊
91␉unsigned int i, j;␊
92␊
93␉for (i = 0, j = 0; j < len; i++, j += 4)␊
94␉␉output[i] = ((u_int32_t)input[j]) | (((u_int32_t)input[j+1]) << 8) |␊
95␉␉ (((u_int32_t)input[j+2]) << 16) | (((u_int32_t)input[j+3]) << 24);␊
96}␊
97#endif /* i386 */␊
98␊
99static unsigned char PADDING[64] = {␊
100 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,␊
101 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,␊
102 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0␊
103};␊
104␊
105/* F, G, H and I are basic MD5 functions. */␊
106#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))␊
107#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))␊
108#define H(x, y, z) ((x) ^ (y) ^ (z))␊
109#define I(x, y, z) ((y) ^ ((x) | (~z)))␊
110␊
111/* ROTATE_LEFT rotates x left n bits. */␊
112#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))␊
113␊
114/*␊
115 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.␊
116 * Rotation is separate from addition to prevent recomputation.␊
117 */␊
118#define FF(a, b, c, d, x, s, ac) { \␊
119␉(a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \␊
120␉(a) = ROTATE_LEFT ((a), (s)); \␊
121␉(a) += (b); \␊
122␉}␊
123#define GG(a, b, c, d, x, s, ac) { \␊
124␉(a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \␊
125␉(a) = ROTATE_LEFT ((a), (s)); \␊
126␉(a) += (b); \␊
127␉}␊
128#define HH(a, b, c, d, x, s, ac) { \␊
129␉(a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \␊
130␉(a) = ROTATE_LEFT ((a), (s)); \␊
131␉(a) += (b); \␊
132␉}␊
133#define II(a, b, c, d, x, s, ac) { \␊
134␉(a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \␊
135␉(a) = ROTATE_LEFT ((a), (s)); \␊
136␉(a) += (b); \␊
137␉}␊
138␊
139static void MD5Transform (u_int32_t state[4], const unsigned char block[64]);␊
140␊
141/* MD5 initialization. Begins an MD5 operation, writing a new context. */␊
142␊
143void␊
144MD5Init (context)␊
145␉MD5_CTX *context;␊
146{␊
147␊
148␉context->count[0] = context->count[1] = 0;␊
149␊
150␉/* Load magic initialization constants. */␊
151␉context->state[0] = 0x67452301;␊
152␉context->state[1] = 0xefcdab89;␊
153␉context->state[2] = 0x98badcfe;␊
154␉context->state[3] = 0x10325476;␊
155}␊
156␊
157/* ␊
158 * MD5 block update operation. Continues an MD5 message-digest␊
159 * operation, processing another message block, and updating the␊
160 * context.␊
161 */␊
162␊
163void␊
164MD5Update (context, input, inputLen)␊
165␉MD5_CTX *context;␊
166#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5␊
167␉const void *input;␊
168#else␊
169␉const unsigned char *input;␊
170#endif␊
171␉unsigned int inputLen;␊
172{␊
173␉unsigned int i, index, partLen;␊
174␊
175␉/* Compute number of bytes mod 64 */␊
176␉index = (unsigned int)((context->count[0] >> 3) & 0x3F);␊
177␊
178␉/* Update number of bits */␊
179␉if ((context->count[0] += ((u_int32_t)inputLen << 3))␊
180␉ < ((u_int32_t)inputLen << 3))␊
181␉␉context->count[1]++;␊
182␉context->count[1] += ((u_int32_t)inputLen >> 29);␊
183␊
184␉partLen = 64 - index;␊
185␊
186␉/* Transform as many times as possible. */␊
187␉if (inputLen >= partLen) {␊
188␉␉memcpy((void *)&context->buffer[index], (const void *)input,␊
189␉␉ partLen);␊
190␉␉MD5Transform (context->state, context->buffer);␊
191␊
192␉␉for (i = partLen; i + 63 < inputLen; i += 64)␊
193␉␉␉MD5Transform (context->state, &((const unsigned char *)input)[i]);␊
194␊
195␉␉index = 0;␊
196␉}␊
197␉else␊
198␉␉i = 0;␊
199␊
200␉/* Buffer remaining input */␊
201␉memcpy ((void *)&context->buffer[index], (const void *)&((const unsigned char*)input)[i],␊
202␉ inputLen-i);␊
203}␊
204␊
205/*␊
206 * MD5 padding. Adds padding followed by original length.␊
207 */␊
208␊
209void␊
210MD5Pad (context)␊
211␉MD5_CTX *context;␊
212{␊
213␉unsigned char bits[8];␊
214␉unsigned int index, padLen;␊
215␊
216␉/* Save number of bits */␊
217␉Encode (bits, context->count, 8);␊
218␊
219␉/* Pad out to 56 mod 64. */␊
220␉index = (unsigned int)((context->count[0] >> 3) & 0x3f);␊
221␉padLen = (index < 56) ? (56 - index) : (120 - index);␊
222␉MD5Update (context, PADDING, padLen);␊
223␊
224␉/* Append length (before padding) */␊
225␉MD5Update (context, bits, 8);␊
226}␊
227␊
228/*␊
229 * MD5 finalization. Ends an MD5 message-digest operation, writing the␊
230 * the message digest and zeroizing the context.␊
231 */␊
232␊
233void␊
234MD5Final (digest, context)␊
235␉unsigned char digest[16];␊
236␉MD5_CTX *context;␊
237{␊
238␉/* Do padding. */␊
239␉MD5Pad (context);␊
240␊
241␉/* Store state in digest */␊
242␉Encode (digest, context->state, 16);␊
243␊
244␉/* Zeroize sensitive information. */␊
245␉memset ((void *)context, 0, sizeof (*context));␊
246}␊
247␊
248/* MD5 basic transformation. Transforms state based on block. */␊
249␊
250static void␊
251MD5Transform (state, block)␊
252␉u_int32_t state[4];␊
253␉const unsigned char block[64];␊
254{␊
255␉u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];␊
256␊
257␉Decode (x, block, 64);␊
258␊
259␉/* Round 1 */␊
260#define S11 7␊
261#define S12 12␊
262#define S13 17␊
263#define S14 22␊
264␉FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */␊
265␉FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */␊
266␉FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */␊
267␉FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */␊
268␉FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */␊
269␉FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */␊
270␉FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */␊
271␉FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */␊
272␉FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */␊
273␉FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */␊
274␉FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */␊
275␉FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */␊
276␉FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */␊
277␉FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */␊
278␉FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */␊
279␉FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */␊
280␊
281␉/* Round 2 */␊
282#define S21 5␊
283#define S22 9␊
284#define S23 14␊
285#define S24 20␊
286␉GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */␊
287␉GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */␊
288␉GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */␊
289␉GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */␊
290␉GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */␊
291␉GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */␊
292␉GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */␊
293␉GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */␊
294␉GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */␊
295␉GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */␊
296␉GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */␊
297␉GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */␊
298␉GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */␊
299␉GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */␊
300␉GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */␊
301␉GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */␊
302␊
303␉/* Round 3 */␊
304#define S31 4␊
305#define S32 11␊
306#define S33 16␊
307#define S34 23␊
308␉HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */␊
309␉HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */␊
310␉HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */␊
311␉HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */␊
312␉HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */␊
313␉HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */␊
314␉HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */␊
315␉HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */␊
316␉HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */␊
317␉HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */␊
318␉HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */␊
319␉HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */␊
320␉HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */␊
321␉HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */␊
322␉HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */␊
323␉HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */␊
324␊
325␉/* Round 4 */␊
326#define S41 6␊
327#define S42 10␊
328#define S43 15␊
329#define S44 21␊
330␉II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */␊
331␉II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */␊
332␉II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */␊
333␉II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */␊
334␉II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */␊
335␉II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */␊
336␉II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */␊
337␉II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */␊
338␉II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */␊
339␉II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */␊
340␉II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */␊
341␉II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */␊
342␉II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */␊
343␉II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */␊
344␉II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */␊
345␉II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */␊
346␊
347␉state[0] += a;␊
348␉state[1] += b;␊
349␉state[2] += c;␊
350␉state[3] += d;␊
351␊
352␉/* Zeroize sensitive information. */␊
353␉memset ((void *)x, 0, sizeof (x));␊
354}␊
355

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