ermyth/src/md5.C

/*
 * Copyright © 2007 Pippijn van Steenhoven / The Ermyth Team
 * Rights to this code are documented in doc/poddoc/gplicense.pod
 *
 * $Id$
 */
#include <memory>               /* for memcpy() */

#include <svsconfig.h>
#include "md5.h"

static char const rcsid[] = "$Id$";

#ifndef HIGHFIRST
#define byteReverse(buf, len)   /* Nothing */
#else
void
byteReverse (unsigned char *buf, unsigned longs)
{
  register uint32_t t;
  do
    {
      t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 | ((unsigned) buf[1] << 8 | buf[0]);
      *(uint32_t *) buf = t;
      buf += 4;
    }
  while (--longs);
}
#endif

/**
 * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
 * initialization constants.
 */
void
MD5Init (MD5Context *ctx)
{
  ctx->buf[0] = 0x67452301;
  ctx->buf[1] = 0xefcdab89;
  ctx->buf[2] = 0x98badcfe;
  ctx->buf[3] = 0x10325476;

  ctx->bits[0] = 0;
  ctx->bits[1] = 0;
}

/**
 * Update context to reflect the concatenation of another buffer full
 * of bytes.
 */
void
MD5Update (MD5Context *ctx, unsigned char const *buf, unsigned len)
{
  register uint32_t t;

  /* Update bitcount */

  t = ctx->bits[0];
  if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
    ctx->bits[1]++;             /* Carry from low to high */
  ctx->bits[1] += len >> 29;

  t = (t >> 3) & 0x3f;          /* Bytes already in shsInfo->data */

  /* Handle any leading odd-sized chunks */

  if (t)
    {
      unsigned char *p = (unsigned char *) ctx->in + t;

      t = 64 - t;
      if (len < t)
        {
          std::memcpy (p, buf, len);
          return;
        }
      std::memcpy (p, buf, t);
      byteReverse (ctx->in, 16);
      MD5Transform (ctx->buf, (uint32_t *) ctx->in);
      buf += t;
      len -= t;
    }
  /* Process data in 64-byte chunks */

  while (len >= 64)
    {
      std::memcpy (ctx->in, buf, 64);
      byteReverse (ctx->in, 16);
      MD5Transform (ctx->buf, (uint32_t *) ctx->in);
      buf += 64;
      len -= 64;
    }

  /* Handle any remaining bytes of data. */

  std::memcpy (ctx->in, buf, len);
}

/**
 * Final wrapup - pad to 64-byte boundary with the bit pattern 
 * 1 0* (64-bit count of bits processed, MSB-first)
 */
void
MD5Final (unsigned char digest[16], MD5Context *ctx)
{
  register unsigned count;
  unsigned char *p;

  /* Compute number of bytes mod 64 */
  count = (ctx->bits[0] >> 3) & 0x3F;

  /* Set the first char of padding to 0x80.  This is safe since there is
     always at least one byte free */
  p = ctx->in + count;
  *p++ = 0x80;

  /* Bytes of padding needed to make 64 bytes */
  count = 64 - 1 - count;

  /* Pad out to 56 mod 64 */
  if (count < 8)
    {
      /* Two lots of padding:  Pad the first block to 64 bytes */
      memset (p, 0, count);
      byteReverse (ctx->in, 16);
      MD5Transform (ctx->buf, (uint32_t *) ctx->in);

      /* Now fill the next block with 56 bytes */
      memset (ctx->in, 0, 56);
    }
  else
    {
      /* Pad block to 56 bytes */
      memset (p, 0, count - 8);
    }
  byteReverse (ctx->in, 14);

  /* Append length in bits and transform */
  ((uint32_t *) ctx->in)[14] = ctx->bits[0];
  ((uint32_t *) ctx->in)[15] = ctx->bits[1];

  MD5Transform (ctx->buf, (uint32_t *) ctx->in);
  byteReverse ((unsigned char *) ctx->buf, 4);
  std::memcpy (digest, ctx->buf, 16);
  memset (ctx, 0, sizeof (ctx));        /* In case it's sensitive */
}


/* The four core functions - F1 is optimized somewhat */

/* #define F1(x, y, z) (x & y | ~x & z) */
inline uint32_t F1 (uint32_t x, uint32_t y, uint32_t z) { return z ^ (x & (y ^ z)); }
inline uint32_t F2 (uint32_t x, uint32_t y, uint32_t z) { return F1(z, x, y);       }
inline uint32_t F3 (uint32_t x, uint32_t y, uint32_t z) { return (x ^ y ^ z);       }
inline uint32_t F4 (uint32_t x, uint32_t y, uint32_t z) { return (y ^ (x | ~z));    }

/* This is the central step in the MD5 algorithm. */
inline void
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)
{
  w += f (x, y, z) + data;
  w = w << s | w >> (32 - s);
  w += x;
}

/**
 * The core of the MD5 algorithm, this alters an existing MD5 hash to
 * reflect the addition of 16 longwords of new data.  MD5Update blocks
 * the data and converts bytes into longwords for this routine.
 */
void
MD5Transform (uint32_t buf[4], uint32_t in[16])
{
  uint32_t a, b, c, d;

  a = buf[0];
  b = buf[1];
  c = buf[2];
  d = buf[3];

  MD5STEP (&F1, a, b, c, d, in[0] + 0xd76aa478, 7);
  MD5STEP (&F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
  MD5STEP (&F1, c, d, a, b, in[2] + 0x242070db, 17);
  MD5STEP (&F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
  MD5STEP (&F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
  MD5STEP (&F1, d, a, b, c, in[5] + 0x4787c62a, 12);
  MD5STEP (&F1, c, d, a, b, in[6] + 0xa8304613, 17);
  MD5STEP (&F1, b, c, d, a, in[7] + 0xfd469501, 22);
  MD5STEP (&F1, a, b, c, d, in[8] + 0x698098d8, 7);
  MD5STEP (&F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
  MD5STEP (&F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
  MD5STEP (&F1, b, c, d, a, in[11] + 0x895cd7be, 22);
  MD5STEP (&F1, a, b, c, d, in[12] + 0x6b901122, 7);
  MD5STEP (&F1, d, a, b, c, in[13] + 0xfd987193, 12);
  MD5STEP (&F1, c, d, a, b, in[14] + 0xa679438e, 17);
  MD5STEP (&F1, b, c, d, a, in[15] + 0x49b40821, 22);

  MD5STEP (&F2, a, b, c, d, in[1] + 0xf61e2562, 5);
  MD5STEP (&F2, d, a, b, c, in[6] + 0xc040b340, 9);
  MD5STEP (&F2, c, d, a, b, in[11] + 0x265e5a51, 14);
  MD5STEP (&F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
  MD5STEP (&F2, a, b, c, d, in[5] + 0xd62f105d, 5);
  MD5STEP (&F2, d, a, b, c, in[10] + 0x02441453, 9);
  MD5STEP (&F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
  MD5STEP (&F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
  MD5STEP (&F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
  MD5STEP (&F2, d, a, b, c, in[14] + 0xc33707d6, 9);
  MD5STEP (&F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
  MD5STEP (&F2, b, c, d, a, in[8] + 0x455a14ed, 20);
  MD5STEP (&F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
  MD5STEP (&F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
  MD5STEP (&F2, c, d, a, b, in[7] + 0x676f02d9, 14);
  MD5STEP (&F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);

  MD5STEP (&F3, a, b, c, d, in[5] + 0xfffa3942, 4);
  MD5STEP (&F3, d, a, b, c, in[8] + 0x8771f681, 11);
  MD5STEP (&F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
  MD5STEP (&F3, b, c, d, a, in[14] + 0xfde5380c, 23);
  MD5STEP (&F3, a, b, c, d, in[1] + 0xa4beea44, 4);
  MD5STEP (&F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
  MD5STEP (&F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
  MD5STEP (&F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
  MD5STEP (&F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
  MD5STEP (&F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
  MD5STEP (&F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
  MD5STEP (&F3, b, c, d, a, in[6] + 0x04881d05, 23);
  MD5STEP (&F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
  MD5STEP (&F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
  MD5STEP (&F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
  MD5STEP (&F3, b, c, d, a, in[2] + 0xc4ac5665, 23);

  MD5STEP (&F4, a, b, c, d, in[0] + 0xf4292244, 6);
  MD5STEP (&F4, d, a, b, c, in[7] + 0x432aff97, 10);
  MD5STEP (&F4, c, d, a, b, in[14] + 0xab9423a7, 15);
  MD5STEP (&F4, b, c, d, a, in[5] + 0xfc93a039, 21);
  MD5STEP (&F4, a, b, c, d, in[12] + 0x655b59c3, 6);
  MD5STEP (&F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
  MD5STEP (&F4, c, d, a, b, in[10] + 0xffeff47d, 15);
  MD5STEP (&F4, b, c, d, a, in[1] + 0x85845dd1, 21);
  MD5STEP (&F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
  MD5STEP (&F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
  MD5STEP (&F4, c, d, a, b, in[6] + 0xa3014314, 15);
  MD5STEP (&F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
  MD5STEP (&F4, a, b, c, d, in[4] + 0xf7537e82, 6);
  MD5STEP (&F4, d, a, b, c, in[11] + 0xbd3af235, 10);
  MD5STEP (&F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
  MD5STEP (&F4, b, c, d, a, in[9] + 0xeb86d391, 21);

  buf[0] += a;
  buf[1] += b;
  buf[2] += c;
  buf[3] += d;
}
Revision:	1.2
Committed:	Tue Aug 28 17:08:12 2007 UTC (16 years, 9 months ago) by pippijn
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+12 -7 lines
Log Message:	- changed name - updated the example config to the new system - added more documentation - enhanced documentation generators - added a link to the pdf to the website - added an RSS feed generator - transitioned hooks to c++ callbacks - did various merges with upstream along the way - added const where appropriate - removed the old block allocator - fixed most memory leaks - transitioned some dictionaries to std::map - transitioned some lists to std::vector - made some free functions members where appropriate - renamed string to dynstr and added a static string ststr - use NOW instead of time (NULL) if possible - completely reworked database backends, crypto handlers and protocol handlers to use an object factory - removed the old module system. ermyth does not do any dynamic loading anymore - fixed most of the build system - reworked how protocol commands work
#	Content
1	/*
2	* Copyright © 2007 Pippijn van Steenhoven / The Ermyth Team
3	* Rights to this code are documented in doc/poddoc/gplicense.pod
4	*
5	* $Id$
6	*/
7	#include <memory> /* for memcpy() */
8
9	#include <svsconfig.h>
10	#include "md5.h"
11
12	static char const rcsid[] = "$Id$";
13
14	#ifndef HIGHFIRST
15	#define byteReverse(buf, len) /* Nothing */
16	#else
17	void
18	byteReverse (unsigned char *buf, unsigned longs)
19	{
20	register uint32_t t;
21	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	register uint32_t t;
55
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	register unsigned count;
107	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	uint32_t a, b, c, d;
175
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	}