1 /*
2 * This file was transplanted with slight modifications from Linux sources
3 * (fs/cifs/md5.c) into U-Boot by Bartlomiej Sieka <tur@semihalf.com>.
4 */
5
6 /*
7 * This code implements the MD5 message-digest algorithm.
8 * The algorithm is due to Ron Rivest. This code was
9 * written by Colin Plumb in 1993, no copyright is claimed.
10 * This code is in the public domain; do with it what you wish.
11 *
12 * Equivalent code is available from RSA Data Security, Inc.
13 * This code has been tested against that, and is equivalent,
14 * except that you don't need to include two pages of legalese
15 * with every copy.
16 *
17 * To compute the message digest of a chunk of bytes, declare an
18 * MD5Context structure, pass it to MD5Init, call MD5Update as
19 * needed on buffers full of bytes, and then call MD5Final, which
20 * will fill a supplied 16-byte array with the digest.
21 */
22
23 /* This code slightly modified to fit into Samba by
24 abartlet@samba.org Jun 2001
25 and to fit the cifs vfs by
26 Steve French sfrench@us.ibm.com */
27
28 #include "compiler.h"
29
30 #ifndef USE_HOSTCC
31 #include <common.h>
32 #include <watchdog.h>
33 #endif /* USE_HOSTCC */
34 #include <u-boot/md5.h>
35
36 static void
37 MD5Transform(__u32 buf[4], __u32 const in[16]);
38
39 /*
40 * Note: this code is harmless on little-endian machines.
41 */
42 static void
byteReverse(unsigned char * buf,unsigned longs)43 byteReverse(unsigned char *buf, unsigned longs)
44 {
45 __u32 t;
46 do {
47 t = (__u32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
48 ((unsigned) buf[1] << 8 | buf[0]);
49 *(__u32 *) buf = t;
50 buf += 4;
51 } while (--longs);
52 }
53
54 /*
55 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
56 * initialization constants.
57 */
58 static void
MD5Init(struct MD5Context * ctx)59 MD5Init(struct MD5Context *ctx)
60 {
61 ctx->buf[0] = 0x67452301;
62 ctx->buf[1] = 0xefcdab89;
63 ctx->buf[2] = 0x98badcfe;
64 ctx->buf[3] = 0x10325476;
65
66 ctx->bits[0] = 0;
67 ctx->bits[1] = 0;
68 }
69
70 /*
71 * Update context to reflect the concatenation of another buffer full
72 * of bytes.
73 */
74 static void
MD5Update(struct MD5Context * ctx,unsigned char const * buf,unsigned len)75 MD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len)
76 {
77 register __u32 t;
78
79 /* Update bitcount */
80
81 t = ctx->bits[0];
82 if ((ctx->bits[0] = t + ((__u32) len << 3)) < t)
83 ctx->bits[1]++; /* Carry from low to high */
84 ctx->bits[1] += len >> 29;
85
86 t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
87
88 /* Handle any leading odd-sized chunks */
89
90 if (t) {
91 unsigned char *p = (unsigned char *) ctx->in + t;
92
93 t = 64 - t;
94 if (len < t) {
95 memmove(p, buf, len);
96 return;
97 }
98 memmove(p, buf, t);
99 byteReverse(ctx->in, 16);
100 MD5Transform(ctx->buf, (__u32 *) ctx->in);
101 buf += t;
102 len -= t;
103 }
104 /* Process data in 64-byte chunks */
105
106 while (len >= 64) {
107 memmove(ctx->in, buf, 64);
108 byteReverse(ctx->in, 16);
109 MD5Transform(ctx->buf, (__u32 *) ctx->in);
110 buf += 64;
111 len -= 64;
112 }
113
114 /* Handle any remaining bytes of data. */
115
116 memmove(ctx->in, buf, len);
117 }
118
119 /*
120 * Final wrapup - pad to 64-byte boundary with the bit pattern
121 * 1 0* (64-bit count of bits processed, MSB-first)
122 */
123 static void
MD5Final(unsigned char digest[16],struct MD5Context * ctx)124 MD5Final(unsigned char digest[16], struct MD5Context *ctx)
125 {
126 unsigned int count;
127 unsigned char *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 byteReverse(ctx->in, 16);
145 MD5Transform(ctx->buf, (__u32 *) ctx->in);
146
147 /* Now fill the next block with 56 bytes */
148 memset(ctx->in, 0, 56);
149 } else {
150 /* Pad block to 56 bytes */
151 memset(p, 0, count - 8);
152 }
153 byteReverse(ctx->in, 14);
154
155 /* Append length in bits and transform */
156 ctx->in32[14] = ctx->bits[0];
157 ctx->in32[15] = ctx->bits[1];
158
159 MD5Transform(ctx->buf, (__u32 *) ctx->in);
160 byteReverse((unsigned char *) ctx->buf, 4);
161 memmove(digest, ctx->buf, 16);
162 memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */
163 }
164
165 /* The four core functions - F1 is optimized somewhat */
166
167 /* #define F1(x, y, z) (x & y | ~x & z) */
168 #define F1(x, y, z) (z ^ (x & (y ^ z)))
169 #define F2(x, y, z) F1(z, x, y)
170 #define F3(x, y, z) (x ^ y ^ z)
171 #define F4(x, y, z) (y ^ (x | ~z))
172
173 /* This is the central step in the MD5 algorithm. */
174 #define MD5STEP(f, w, x, y, z, data, s) \
175 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
176
177 /*
178 * The core of the MD5 algorithm, this alters an existing MD5 hash to
179 * reflect the addition of 16 longwords of new data. MD5Update blocks
180 * the data and converts bytes into longwords for this routine.
181 */
182 static void
MD5Transform(__u32 buf[4],__u32 const in[16])183 MD5Transform(__u32 buf[4], __u32 const in[16])
184 {
185 register __u32 a, b, c, d;
186
187 a = buf[0];
188 b = buf[1];
189 c = buf[2];
190 d = buf[3];
191
192 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
193 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
194 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
195 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
196 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
197 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
198 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
199 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
200 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
201 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
202 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
203 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
204 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
205 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
206 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
207 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
208
209 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
210 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
211 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
212 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
213 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
214 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
215 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
216 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
217 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
218 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
219 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
220 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
221 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
222 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
223 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
224 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
225
226 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
227 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
228 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
229 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
230 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
231 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
232 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
233 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
234 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
235 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
236 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
237 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
238 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
239 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
240 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
241 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
242
243 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
244 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
245 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
246 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
247 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
248 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
249 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
250 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
251 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
252 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
253 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
254 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
255 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
256 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
257 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
258 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
259
260 buf[0] += a;
261 buf[1] += b;
262 buf[2] += c;
263 buf[3] += d;
264 }
265
266 /*
267 * Calculate and store in 'output' the MD5 digest of 'len' bytes at
268 * 'input'. 'output' must have enough space to hold 16 bytes.
269 */
270 void
md5(unsigned char * input,int len,unsigned char output[16])271 md5 (unsigned char *input, int len, unsigned char output[16])
272 {
273 struct MD5Context context;
274
275 MD5Init(&context);
276 MD5Update(&context, input, len);
277 MD5Final(output, &context);
278 }
279
280
281 /*
282 * Calculate and store in 'output' the MD5 digest of 'len' bytes at 'input'.
283 * 'output' must have enough space to hold 16 bytes. If 'chunk' Trigger the
284 * watchdog every 'chunk_sz' bytes of input processed.
285 */
286 void
md5_wd(unsigned char * input,int len,unsigned char output[16],unsigned int chunk_sz)287 md5_wd (unsigned char *input, int len, unsigned char output[16],
288 unsigned int chunk_sz)
289 {
290 struct MD5Context context;
291 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
292 unsigned char *end, *curr;
293 int chunk;
294 #endif
295
296 MD5Init(&context);
297
298 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
299 curr = input;
300 end = input + len;
301 while (curr < end) {
302 chunk = end - curr;
303 if (chunk > chunk_sz)
304 chunk = chunk_sz;
305 MD5Update(&context, curr, chunk);
306 curr += chunk;
307 WATCHDOG_RESET ();
308 }
309 #else
310 MD5Update(&context, input, len);
311 #endif
312
313 MD5Final(output, &context);
314 }
315