Annotation of elwix/tools/uboot_mkimage/lib/md5.c, revision 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: }
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