libsyncml 0.5.4

- Main Page
- Modules
- Data Structures
- Files

- File List

sml_md5.c
1 /* parts of this file are :
2 * Written March 1993 by Branko Lankester
3 * Modified June 1993 by Colin Plumb for altered md5.c.
4 * Modified October 1995 by Erik Troan for RPM
5 * Modified again 2005 by Armin Bauer
6 * This code is in the public domain
7 *
8 */
9
10 #include "syncml.h"
11 #include "syncml_internals.h"
12 #include "sml_error_internals.h"
13
14 #include <string.h>
15 #include <stdint.h>
16 #include "sml_md5.h"
17 #include <glib.h>
18
19 typedef struct SmlMD5Context {
20 uint32_t buf[4];
21 uint32_t bits[2];
22 unsigned char in[64];
23 int doByteReverse;
24 } SmlMD5Context;
25
26 void smlMD5Init(SmlMD5Context *ctx);
27 void smlMD5Update(SmlMD5Context *ctx, const char *buf, uint32_t len);
28 void smlMD5Final (SmlMD5Context *ctx, unsigned char digest[16]);
29 static void smlMD5Transform(uint32_t buf[4], const uint32_t in[16]);
30
31 static gint _ie = 0x44332211;
32 static union _endian { gint i; gchar b[4]; } *_endian = (union _endian *)&_ie;
33 #define IS_BIG_ENDIAN() (_endian->b[0] == '\x44')
34 #define IS_LITTLE_ENDIAN() (_endian->b[0] == '\x11')
35
36 /* The four core functions - F1 is optimized somewhat */
37
38 /* #define F1(x, y, z) (x & y | ~x & z) */
39 #define F1(x, y, z) (z ^ (x & (y ^ z)))
40 #define F2(x, y, z) F1(z, x, y)
41 #define F3(x, y, z) (x ^ y ^ z)
42 #define F4(x, y, z) (y ^ (x | ~z))
43
44 /* This is the central step in the MD5 algorithm. */
45 #define MD5STEP(f, w, x, y, z, data, s) ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
46
47 /*
48 * Note: this code is harmless on little-endian machines.
49 */
50 static void
51 _byte_reverse (guchar *buf, guint32 longs)
52 {
53 guint32 t;
54 do {
55 t = (guint32) ((guint32) buf[3] << 8 | buf[2]) << 16 |
56 ((guint32) buf[1] << 8 | buf[0]);
57 *(guint32 *) buf = t;
58 buf += 4;
59 } while (--longs);
60 }
61
62 void smlMD5Init(SmlMD5Context *ctx)
63 {
64 ctx->buf[0] = 0x67452301;
65 ctx->buf[1] = 0xefcdab89;
66 ctx->buf[2] = 0x98badcfe;
67 ctx->buf[3] = 0x10325476;
68
69 ctx->bits[0] = 0;
70 ctx->bits[1] = 0;
71
72 if (IS_BIG_ENDIAN())
73 ctx->doByteReverse = 1;
74 else
75 ctx->doByteReverse = 0;
76 }
77
78 void smlMD5Update(SmlMD5Context *ctx, const char *buf, uint32_t len)
79 {
80 guint32 t;
81
82 /* Update bitcount */
83
84 t = ctx->bits[0];
85 if ((ctx->bits[0] = t + ((guint32) len << 3)) < t)
86 ctx->bits[1]++; /* Carry from low to high */
87 ctx->bits[1] += len >> 29;
88
89 t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
90
91 /* Handle any leading odd-sized chunks */
92
93 if (t) {
94 guchar *p = (guchar *) ctx->in + t;
95
96 t = 64 - t;
97 if (len < t) {
98 memcpy (p, buf, len);
99 return;
100 }
101 memcpy (p, buf, t);
102 if (ctx->doByteReverse)
103 _byte_reverse (ctx->in, 16);
104 smlMD5Transform (ctx->buf, (guint32 *) ctx->in);
105 buf += t;
106 len -= t;
107 }
108 /* Process data in 64-byte chunks */
109
110 while (len >= 64) {
111 memcpy (ctx->in, buf, 64);
112 if (ctx->doByteReverse)
113 _byte_reverse (ctx->in, 16);
114 smlMD5Transform (ctx->buf, (guint32 *) ctx->in);
115 buf += 64;
116 len -= 64;
117 }
118
119 /* Handle any remaining bytes of data. */
120
121 memcpy (ctx->in, buf, len);
122 }
123
124 void smlMD5Final (SmlMD5Context *ctx, unsigned char digest[16])
125 {
126 guint32 count;
127 guchar *p;
128
129 /* Compute number of bytes mod 64 */
130 count = (ctx->bits[0] >> 3) & 0x3F;
131
132 /* Set the first char of padding to 0x80. This is safe since there is
133 always at least one byte free */
134 p = ctx->in + count;
135 *p++ = 0x80;
136
137 /* Bytes of padding needed to make 64 bytes */
138 count = 64 - 1 - count;
139
140 /* Pad out to 56 mod 64 */
141 if (count < 8) {
142 /* Two lots of padding: Pad the first block to 64 bytes */
143 memset (p, 0, count);
144 if (ctx->doByteReverse)
145 _byte_reverse (ctx->in, 16);
146 smlMD5Transform (ctx->buf, (guint32 *) ctx->in);
147
148 /* Now fill the next block with 56 bytes */
149 memset (ctx->in, 0, 56);
150 } else {
151 /* Pad block to 56 bytes */
152 memset (p, 0, count - 8);
153 }
154 if (ctx->doByteReverse)
155 _byte_reverse (ctx->in, 14);
156
157 /* Append length in bits and transform */
158 ((guint32 *) ctx->in)[14] = ctx->bits[0];
159 ((guint32 *) ctx->in)[15] = ctx->bits[1];
160
161 smlMD5Transform (ctx->buf, (guint32 *) ctx->in);
162 if (ctx->doByteReverse)
163 _byte_reverse ((guchar *) ctx->buf, 4);
164 memcpy (digest, ctx->buf, 16);
165 }
166
167 static void smlMD5Transform(uint32_t buf[4], const uint32_t in[16])
168 {
169 register guint32 a, b, c, d;
170
171 a = buf[0];
172 b = buf[1];
173 c = buf[2];
174 d = buf[3];
175
176 MD5STEP (F1, a, b, c, d, in[0] + 0xd76aa478, 7);
177 MD5STEP (F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
178 MD5STEP (F1, c, d, a, b, in[2] + 0x242070db, 17);
179 MD5STEP (F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
180 MD5STEP (F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
181 MD5STEP (F1, d, a, b, c, in[5] + 0x4787c62a, 12);
182 MD5STEP (F1, c, d, a, b, in[6] + 0xa8304613, 17);
183 MD5STEP (F1, b, c, d, a, in[7] + 0xfd469501, 22);
184 MD5STEP (F1, a, b, c, d, in[8] + 0x698098d8, 7);
185 MD5STEP (F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
186 MD5STEP (F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
187 MD5STEP (F1, b, c, d, a, in[11] + 0x895cd7be, 22);
188 MD5STEP (F1, a, b, c, d, in[12] + 0x6b901122, 7);
189 MD5STEP (F1, d, a, b, c, in[13] + 0xfd987193, 12);
190 MD5STEP (F1, c, d, a, b, in[14] + 0xa679438e, 17);
191 MD5STEP (F1, b, c, d, a, in[15] + 0x49b40821, 22);
192
193 MD5STEP (F2, a, b, c, d, in[1] + 0xf61e2562, 5);
194 MD5STEP (F2, d, a, b, c, in[6] + 0xc040b340, 9);
195 MD5STEP (F2, c, d, a, b, in[11] + 0x265e5a51, 14);
196 MD5STEP (F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
197 MD5STEP (F2, a, b, c, d, in[5] + 0xd62f105d, 5);
198 MD5STEP (F2, d, a, b, c, in[10] + 0x02441453, 9);
199 MD5STEP (F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
200 MD5STEP (F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
201 MD5STEP (F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
202 MD5STEP (F2, d, a, b, c, in[14] + 0xc33707d6, 9);
203 MD5STEP (F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
204 MD5STEP (F2, b, c, d, a, in[8] + 0x455a14ed, 20);
205 MD5STEP (F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
206 MD5STEP (F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
207 MD5STEP (F2, c, d, a, b, in[7] + 0x676f02d9, 14);
208 MD5STEP (F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
209
210 MD5STEP (F3, a, b, c, d, in[5] + 0xfffa3942, 4);
211 MD5STEP (F3, d, a, b, c, in[8] + 0x8771f681, 11);
212 MD5STEP (F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
213 MD5STEP (F3, b, c, d, a, in[14] + 0xfde5380c, 23);
214 MD5STEP (F3, a, b, c, d, in[1] + 0xa4beea44, 4);
215 MD5STEP (F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
216 MD5STEP (F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
217 MD5STEP (F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
218 MD5STEP (F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
219 MD5STEP (F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
220 MD5STEP (F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
221 MD5STEP (F3, b, c, d, a, in[6] + 0x04881d05, 23);
222 MD5STEP (F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
223 MD5STEP (F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
224 MD5STEP (F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
225 MD5STEP (F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
226
227 MD5STEP (F4, a, b, c, d, in[0] + 0xf4292244, 6);
228 MD5STEP (F4, d, a, b, c, in[7] + 0x432aff97, 10);
229 MD5STEP (F4, c, d, a, b, in[14] + 0xab9423a7, 15);
230 MD5STEP (F4, b, c, d, a, in[5] + 0xfc93a039, 21);
231 MD5STEP (F4, a, b, c, d, in[12] + 0x655b59c3, 6);
232 MD5STEP (F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
233 MD5STEP (F4, c, d, a, b, in[10] + 0xffeff47d, 15);
234 MD5STEP (F4, b, c, d, a, in[1] + 0x85845dd1, 21);
235 MD5STEP (F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
236 MD5STEP (F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
237 MD5STEP (F4, c, d, a, b, in[6] + 0xa3014314, 15);
238 MD5STEP (F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
239 MD5STEP (F4, a, b, c, d, in[4] + 0xf7537e82, 6);
240 MD5STEP (F4, d, a, b, c, in[11] + 0xbd3af235, 10);
241 MD5STEP (F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
242 MD5STEP (F4, b, c, d, a, in[9] + 0xeb86d391, 21);
243
244 buf[0] += a;
245 buf[1] += b;
246 buf[2] += c;
247 buf[3] += d;
248 }
249
250 void smlMD5GetDigest (const char *buffer, int buffer_size, unsigned char digest[16])
251 {
252 SmlMD5Context ctx;
253
254 smlMD5Init (&ctx);
255 smlMD5Update (&ctx, buffer, buffer_size);
256 smlMD5Final (&ctx, digest);
257
258 }
259
260 char *smlMD5ToString(unsigned char digest[16], SmlError **error)
261 {
262 CHECK_ERROR_REF
263 char *string = smlTryMalloc0(33, error);
264 if (!string)
265 return NULL;
266
267 snprintf(string, 33, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", digest[0], digest[1], digest[2], digest[3], digest[4], digest[5], digest[6], digest[7], digest[8], digest[9], digest[10], digest[11], digest[12], digest[13], digest[14], digest[15]);
268 return string;
269 }