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/cvs/ermyth/src/md5.C
Revision: 1.3
Committed: Wed Sep 5 11:23:15 2007 UTC (19 years ago) by pippijn
Content type: text/plain
Branch: MAIN
Changes since 1.2: +3 -3 lines
Log Message: 
removed GPLed code and put license back to BSD

File Contents

# User Rev Content
1 pippijn 1.2 /*
2     * Copyright © 2007 Pippijn van Steenhoven / The Ermyth Team
3 pippijn 1.3 * Rights to this code are documented in doc/poddoc/license.pod
4 pippijn 1.2 *
5 pippijn 1.3 * $Id: md5.C,v 1.2 2007-08-28 17:08:12 pippijn Exp $
6 pippijn 1.2 */
7 pippijn 1.1 #include <memory> /* for memcpy() */
8    
9     #include <svsconfig.h>
10     #include "md5.h"
11    
12 pippijn 1.3 static char const rcsid[] = "$Id: md5.C,v 1.2 2007-08-28 17:08:12 pippijn Exp $";
13 pippijn 1.2
14 pippijn 1.1 #ifndef HIGHFIRST
15     #define byteReverse(buf, len) /* Nothing */
16     #else
17     void
18     byteReverse (unsigned char *buf, unsigned longs)
19     {
20 pippijn 1.2 register uint32_t t;
21 pippijn 1.1 do
22     {
23     t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 | ((unsigned) buf[1] << 8 | buf[0]);
24     *(uint32_t *) buf = t;
25     buf += 4;
26     }
27     while (--longs);
28     }
29     #endif
30    
31     /**
32     * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
33     * initialization constants.
34     */
35     void
36     MD5Init (MD5Context *ctx)
37     {
38     ctx->buf[0] = 0x67452301;
39     ctx->buf[1] = 0xefcdab89;
40     ctx->buf[2] = 0x98badcfe;
41     ctx->buf[3] = 0x10325476;
42    
43     ctx->bits[0] = 0;
44     ctx->bits[1] = 0;
45     }
46    
47     /**
48     * Update context to reflect the concatenation of another buffer full
49     * of bytes.
50     */
51     void
52     MD5Update (MD5Context *ctx, unsigned char const *buf, unsigned len)
53     {
54 pippijn 1.2 register uint32_t t;
55 pippijn 1.1
56     /* Update bitcount */
57    
58     t = ctx->bits[0];
59     if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
60     ctx->bits[1]++; /* Carry from low to high */
61     ctx->bits[1] += len >> 29;
62    
63     t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
64    
65     /* Handle any leading odd-sized chunks */
66    
67     if (t)
68     {
69     unsigned char *p = (unsigned char *) ctx->in + t;
70    
71     t = 64 - t;
72     if (len < t)
73     {
74     std::memcpy (p, buf, len);
75     return;
76     }
77     std::memcpy (p, buf, t);
78     byteReverse (ctx->in, 16);
79     MD5Transform (ctx->buf, (uint32_t *) ctx->in);
80     buf += t;
81     len -= t;
82     }
83     /* Process data in 64-byte chunks */
84    
85     while (len >= 64)
86     {
87     std::memcpy (ctx->in, buf, 64);
88     byteReverse (ctx->in, 16);
89     MD5Transform (ctx->buf, (uint32_t *) ctx->in);
90     buf += 64;
91     len -= 64;
92     }
93    
94     /* Handle any remaining bytes of data. */
95    
96     std::memcpy (ctx->in, buf, len);
97     }
98    
99     /**
100     * Final wrapup - pad to 64-byte boundary with the bit pattern
101     * 1 0* (64-bit count of bits processed, MSB-first)
102     */
103     void
104     MD5Final (unsigned char digest[16], MD5Context *ctx)
105     {
106 pippijn 1.2 register unsigned count;
107 pippijn 1.1 unsigned char *p;
108    
109     /* Compute number of bytes mod 64 */
110     count = (ctx->bits[0] >> 3) & 0x3F;
111    
112     /* Set the first char of padding to 0x80. This is safe since there is
113     always at least one byte free */
114     p = ctx->in + count;
115     *p++ = 0x80;
116    
117     /* Bytes of padding needed to make 64 bytes */
118     count = 64 - 1 - count;
119    
120     /* Pad out to 56 mod 64 */
121     if (count < 8)
122     {
123     /* Two lots of padding: Pad the first block to 64 bytes */
124     memset (p, 0, count);
125     byteReverse (ctx->in, 16);
126     MD5Transform (ctx->buf, (uint32_t *) ctx->in);
127    
128     /* Now fill the next block with 56 bytes */
129     memset (ctx->in, 0, 56);
130     }
131     else
132     {
133     /* Pad block to 56 bytes */
134     memset (p, 0, count - 8);
135     }
136     byteReverse (ctx->in, 14);
137    
138     /* Append length in bits and transform */
139     ((uint32_t *) ctx->in)[14] = ctx->bits[0];
140     ((uint32_t *) ctx->in)[15] = ctx->bits[1];
141    
142     MD5Transform (ctx->buf, (uint32_t *) ctx->in);
143     byteReverse ((unsigned char *) ctx->buf, 4);
144     std::memcpy (digest, ctx->buf, 16);
145     memset (ctx, 0, sizeof (ctx)); /* In case it's sensitive */
146     }
147    
148    
149     /* The four core functions - F1 is optimized somewhat */
150    
151     /* #define F1(x, y, z) (x & y | ~x & z) */
152     inline uint32_t F1 (uint32_t x, uint32_t y, uint32_t z) { return z ^ (x & (y ^ z)); }
153     inline uint32_t F2 (uint32_t x, uint32_t y, uint32_t z) { return F1(z, x, y); }
154     inline uint32_t F3 (uint32_t x, uint32_t y, uint32_t z) { return (x ^ y ^ z); }
155     inline uint32_t F4 (uint32_t x, uint32_t y, uint32_t z) { return (y ^ (x | ~z)); }
156    
157     /* This is the central step in the MD5 algorithm. */
158     inline void
159     MD5STEP (uint32_t (*f)(uint32_t, uint32_t, uint32_t), uint32_t &w, uint32_t &x, uint32_t &y, uint32_t &z, unsigned data, int s)
160     {
161     w += f (x, y, z) + data;
162     w = w << s | w >> (32 - s);
163     w += x;
164     }
165    
166     /**
167     * The core of the MD5 algorithm, this alters an existing MD5 hash to
168     * reflect the addition of 16 longwords of new data. MD5Update blocks
169     * the data and converts bytes into longwords for this routine.
170     */
171     void
172     MD5Transform (uint32_t buf[4], uint32_t in[16])
173     {
174 pippijn 1.2 uint32_t a, b, c, d;
175 pippijn 1.1
176     a = buf[0];
177     b = buf[1];
178     c = buf[2];
179     d = buf[3];
180    
181     MD5STEP (&F1, a, b, c, d, in[0] + 0xd76aa478, 7);
182     MD5STEP (&F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
183     MD5STEP (&F1, c, d, a, b, in[2] + 0x242070db, 17);
184     MD5STEP (&F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
185     MD5STEP (&F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
186     MD5STEP (&F1, d, a, b, c, in[5] + 0x4787c62a, 12);
187     MD5STEP (&F1, c, d, a, b, in[6] + 0xa8304613, 17);
188     MD5STEP (&F1, b, c, d, a, in[7] + 0xfd469501, 22);
189     MD5STEP (&F1, a, b, c, d, in[8] + 0x698098d8, 7);
190     MD5STEP (&F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
191     MD5STEP (&F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
192     MD5STEP (&F1, b, c, d, a, in[11] + 0x895cd7be, 22);
193     MD5STEP (&F1, a, b, c, d, in[12] + 0x6b901122, 7);
194     MD5STEP (&F1, d, a, b, c, in[13] + 0xfd987193, 12);
195     MD5STEP (&F1, c, d, a, b, in[14] + 0xa679438e, 17);
196     MD5STEP (&F1, b, c, d, a, in[15] + 0x49b40821, 22);
197    
198     MD5STEP (&F2, a, b, c, d, in[1] + 0xf61e2562, 5);
199     MD5STEP (&F2, d, a, b, c, in[6] + 0xc040b340, 9);
200     MD5STEP (&F2, c, d, a, b, in[11] + 0x265e5a51, 14);
201     MD5STEP (&F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
202     MD5STEP (&F2, a, b, c, d, in[5] + 0xd62f105d, 5);
203     MD5STEP (&F2, d, a, b, c, in[10] + 0x02441453, 9);
204     MD5STEP (&F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
205     MD5STEP (&F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
206     MD5STEP (&F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
207     MD5STEP (&F2, d, a, b, c, in[14] + 0xc33707d6, 9);
208     MD5STEP (&F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
209     MD5STEP (&F2, b, c, d, a, in[8] + 0x455a14ed, 20);
210     MD5STEP (&F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
211     MD5STEP (&F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
212     MD5STEP (&F2, c, d, a, b, in[7] + 0x676f02d9, 14);
213     MD5STEP (&F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
214    
215     MD5STEP (&F3, a, b, c, d, in[5] + 0xfffa3942, 4);
216     MD5STEP (&F3, d, a, b, c, in[8] + 0x8771f681, 11);
217     MD5STEP (&F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
218     MD5STEP (&F3, b, c, d, a, in[14] + 0xfde5380c, 23);
219     MD5STEP (&F3, a, b, c, d, in[1] + 0xa4beea44, 4);
220     MD5STEP (&F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
221     MD5STEP (&F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
222     MD5STEP (&F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
223     MD5STEP (&F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
224     MD5STEP (&F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
225     MD5STEP (&F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
226     MD5STEP (&F3, b, c, d, a, in[6] + 0x04881d05, 23);
227     MD5STEP (&F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
228     MD5STEP (&F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
229     MD5STEP (&F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
230     MD5STEP (&F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
231    
232     MD5STEP (&F4, a, b, c, d, in[0] + 0xf4292244, 6);
233     MD5STEP (&F4, d, a, b, c, in[7] + 0x432aff97, 10);
234     MD5STEP (&F4, c, d, a, b, in[14] + 0xab9423a7, 15);
235     MD5STEP (&F4, b, c, d, a, in[5] + 0xfc93a039, 21);
236     MD5STEP (&F4, a, b, c, d, in[12] + 0x655b59c3, 6);
237     MD5STEP (&F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
238     MD5STEP (&F4, c, d, a, b, in[10] + 0xffeff47d, 15);
239     MD5STEP (&F4, b, c, d, a, in[1] + 0x85845dd1, 21);
240     MD5STEP (&F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
241     MD5STEP (&F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
242     MD5STEP (&F4, c, d, a, b, in[6] + 0xa3014314, 15);
243     MD5STEP (&F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
244     MD5STEP (&F4, a, b, c, d, in[4] + 0xf7537e82, 6);
245     MD5STEP (&F4, d, a, b, c, in[11] + 0xbd3af235, 10);
246     MD5STEP (&F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
247     MD5STEP (&F4, b, c, d, a, in[9] + 0xeb86d391, 21);
248    
249     buf[0] += a;
250     buf[1] += b;
251     buf[2] += c;
252     buf[3] += d;
253     }