Annotation of elwix/tools/uboot_mkimage/lib/md5.c, revision 1.1.1.1
1.1 misho 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
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
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
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
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: ((__u32 *) ctx->in)[14] = ctx->bits[0];
157: ((__u32 *) ctx->in)[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
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
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
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: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to md5.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / elwix / tools / uboot_mkimage / lib