md5.cpp

比较简单的md5的应用,用户使用起来非常方便

			 */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

			 /* ROTATE_LEFT rotates x left n bits.
			 */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

			 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
			 Rotation is separate from addition to prevent recomputation.
			 */
#define FF(a, b, c, d, x, s, ac) { \
	(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}
#define GG(a, b, c, d, x, s, ac) { \
	(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}
#define HH(a, b, c, d, x, s, ac) { \
	(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}
#define II(a, b, c, d, x, s, ac) { \
	(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
}

			 /* MD5 initialization. Begins an MD5 operation, writing a new context.
			 */
			 void ap_MD5Init(AP_MD5_CTX *context)
			 {
				 context->count[0] = context->count[1] = 0;
				 /* Load magic initialization constants. */
				 context->state[0] = 0x67452301;
				 context->state[1] = 0xefcdab89;
				 context->state[2] = 0x98badcfe;
				 context->state[3] = 0x10325476;
			 }

			 /* MD5 block update operation. Continues an MD5 message-digest
			 operation, processing another message block, and updating the
			 context.
			 */
			 void  ap_MD5Update(AP_MD5_CTX *context, const unsigned char *input,
				 unsigned int inputLen)
			 {
				 unsigned int i, idx, partLen;

				 /* Compute number of bytes mod 64 */
				 idx = (unsigned int) ((context->count[0] >> 3) & 0x3F);

				 /* Update number of bits */
				 if ((context->count[0] += ((UINT4) inputLen << 3))
					 < ((UINT4) inputLen << 3)) {
						 context->count[1]++;
					 }
					 context->count[1] += (UINT4) inputLen >> 29;

					 partLen = 64 - idx;

					 /* Transform as many times as possible. */
#ifndef CHARSET_EBCDIC
					 if (inputLen >= partLen) {
						 memcpy(&context->buffer[idx], input, partLen);
						 MD5Transform(context->state, context->buffer);

						 for (i = partLen; i + 63 < inputLen; i += 64) {
							 MD5Transform(context->state, &input[i]);
						 }

						 idx = 0;
					 }
					 else {
						 i = 0;
					 }

					 /* Buffer remaining input */
					 memcpy(&context->buffer[idx], &input[i], inputLen - i);
#else /*CHARSET_EBCDIC*/
					 if (inputLen >= partLen) {
						 ebcdic2ascii(&context->buffer[idx], input, partLen);
						 MD5Transform(context->state, context->buffer);

						 for (i = partLen; i + 63 < inputLen; i += 64) {
							 unsigned char inp_tmp[64];
							 ebcdic2ascii(inp_tmp, &input[i], 64);
							 MD5Transform(context->state, inp_tmp);
						 }

						 idx = 0;
					 }
					 else {
						 i = 0;
					 }

					 /* Buffer remaining input */
					 ebcdic2ascii(&context->buffer[idx], &input[i], inputLen - i);
#endif /*CHARSET_EBCDIC*/
			 }

			 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
			 the message digest and zeroizing the context.
			 */
			 void ap_MD5Final(unsigned char digest[16], AP_MD5_CTX *context)
			 {
				 unsigned char bits[8];
				 unsigned int idx, padLen;


				 /* Save number of bits */
				 Encode(bits, context->count, 8);

#ifdef CHARSET_EBCDIC
				 /* XXX: @@@: In order to make this no more complex than necessary,
				 * this kludge converts the bits[] array using the ascii-to-ebcdic
				 * table, because the following ap_MD5Update() re-translates
				 * its input (ebcdic-to-ascii).
				 * Otherwise, we would have to pass a "conversion" flag to ap_MD5Update()
				 */
				 ascii2ebcdic(bits,bits,8);

				 /* Since everything is converted to ascii within ap_MD5Update(), 
				 * the initial 0x80 (PADDING[0]) must be stored as 0x20 
				 */
				 PADDING[0] = os_toebcdic[0x80];
#endif /*CHARSET_EBCDIC*/

				 /* Pad out to 56 mod 64. */
				 idx = (unsigned int) ((context->count[0] >> 3) & 0x3f);
				 padLen = (idx < 56) ? (56 - idx) : (120 - idx);
				 ap_MD5Update(context, (const unsigned char *)PADDING, padLen);

				 /* Append length (before padding) */
				 ap_MD5Update(context, (const unsigned char *)bits, 8);

				 /* Store state in digest */
				 Encode(digest, context->state, 16);

				 /* Zeroize sensitive information. */
				 memset(context, 0, sizeof(*context));
			 }

			 /* MD5 basic transformation. Transforms state based on block. */
			 static void MD5Transform(UINT4 state[4], const unsigned char block[64])
			 {
				 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

				 Decode(x, block, 64);

				 /* Round 1 */
				 FF(a, b, c, d, x[0], S11, 0xd76aa478);	/* 1 */
				 FF(d, a, b, c, x[1], S12, 0xe8c7b756);	/* 2 */
				 FF(c, d, a, b, x[2], S13, 0x242070db);	/* 3 */
				 FF(b, c, d, a, x[3], S14, 0xc1bdceee);	/* 4 */
				 FF(a, b, c, d, x[4], S11, 0xf57c0faf);	/* 5 */
				 FF(d, a, b, c, x[5], S12, 0x4787c62a);	/* 6 */
				 FF(c, d, a, b, x[6], S13, 0xa8304613);	/* 7 */
				 FF(b, c, d, a, x[7], S14, 0xfd469501);	/* 8 */
				 FF(a, b, c, d, x[8], S11, 0x698098d8);	/* 9 */
				 FF(d, a, b, c, x[9], S12, 0x8b44f7af);	/* 10 */
				 FF(c, d, a, b, x[10], S13, 0xffff5bb1);	/* 11 */
				 FF(b, c, d, a, x[11], S14, 0x895cd7be);	/* 12 */
				 FF(a, b, c, d, x[12], S11, 0x6b901122);	/* 13 */
				 FF(d, a, b, c, x[13], S12, 0xfd987193);	/* 14 */
				 FF(c, d, a, b, x[14], S13, 0xa679438e);	/* 15 */
				 FF(b, c, d, a, x[15], S14, 0x49b40821);	/* 16 */

				 /* Round 2 */
				 GG(a, b, c, d, x[1], S21, 0xf61e2562);	/* 17 */
				 GG(d, a, b, c, x[6], S22, 0xc040b340);	/* 18 */
				 GG(c, d, a, b, x[11], S23, 0x265e5a51);	/* 19 */
				 GG(b, c, d, a, x[0], S24, 0xe9b6c7aa);	/* 20 */
				 GG(a, b, c, d, x[5], S21, 0xd62f105d);	/* 21 */
				 GG(d, a, b, c, x[10], S22, 0x2441453);	/* 22 */
				 GG(c, d, a, b, x[15], S23, 0xd8a1e681);	/* 23 */
				 GG(b, c, d, a, x[4], S24, 0xe7d3fbc8);	/* 24 */
				 GG(a, b, c, d, x[9], S21, 0x21e1cde6);	/* 25 */
				 GG(d, a, b, c, x[14], S22, 0xc33707d6);	/* 26 */
				 GG(c, d, a, b, x[3], S23, 0xf4d50d87);	/* 27 */
				 GG(b, c, d, a, x[8], S24, 0x455a14ed);	/* 28 */
				 GG(a, b, c, d, x[13], S21, 0xa9e3e905);	/* 29 */
				 GG(d, a, b, c, x[2], S22, 0xfcefa3f8);	/* 30 */
				 GG(c, d, a, b, x[7], S23, 0x676f02d9);	/* 31 */
				 GG(b, c, d, a, x[12], S24, 0x8d2a4c8a);	/* 32 */

				 /* Round 3 */
				 HH(a, b, c, d, x[5], S31, 0xfffa3942);	/* 33 */
				 HH(d, a, b, c, x[8], S32, 0x8771f681);	/* 34 */
				 HH(c, d, a, b, x[11], S33, 0x6d9d6122);	/* 35 */
				 HH(b, c, d, a, x[14], S34, 0xfde5380c);	/* 36 */
				 HH(a, b, c, d, x[1], S31, 0xa4beea44);	/* 37 */
				 HH(d, a, b, c, x[4], S32, 0x4bdecfa9);	/* 38 */
				 HH(c, d, a, b, x[7], S33, 0xf6bb4b60);	/* 39 */
				 HH(b, c, d, a, x[10], S34, 0xbebfbc70);	/* 40 */
				 HH(a, b, c, d, x[13], S31, 0x289b7ec6);	/* 41 */
				 HH(d, a, b, c, x[0], S32, 0xeaa127fa);	/* 42 */
				 HH(c, d, a, b, x[3], S33, 0xd4ef3085);	/* 43 */
				 HH(b, c, d, a, x[6], S34, 0x4881d05);	/* 44 */
				 HH(a, b, c, d, x[9], S31, 0xd9d4d039);	/* 45 */
				 HH(d, a, b, c, x[12], S32, 0xe6db99e5);	/* 46 */
				 HH(c, d, a, b, x[15], S33, 0x1fa27cf8);	/* 47 */
				 HH(b, c, d, a, x[2], S34, 0xc4ac5665);	/* 48 */

				 /* Round 4 */
				 II(a, b, c, d, x[0], S41, 0xf4292244);	/* 49 */
				 II(d, a, b, c, x[7], S42, 0x432aff97);	/* 50 */
				 II(c, d, a, b, x[14], S43, 0xab9423a7);	/* 51 */
				 II(b, c, d, a, x[5], S44, 0xfc93a039);	/* 52 */
				 II(a, b, c, d, x[12], S41, 0x655b59c3);	/* 53 */
				 II(d, a, b, c, x[3], S42, 0x8f0ccc92);	/* 54 */
				 II(c, d, a, b, x[10], S43, 0xffeff47d);	/* 55 */
				 II(b, c, d, a, x[1], S44, 0x85845dd1);	/* 56 */
				 II(a, b, c, d, x[8], S41, 0x6fa87e4f);	/* 57 */
				 II(d, a, b, c, x[15], S42, 0xfe2ce6e0);	/* 58 */
				 II(c, d, a, b, x[6], S43, 0xa3014314);	/* 59 */
				 II(b, c, d, a, x[13], S44, 0x4e0811a1);	/* 60 */
				 II(a, b, c, d, x[4], S41, 0xf7537e82);	/* 61 */
				 II(d, a, b, c, x[11], S42, 0xbd3af235);	/* 62 */
				 II(c, d, a, b, x[2], S43, 0x2ad7d2bb);	/* 63 */
				 II(b, c, d, a, x[9], S44, 0xeb86d391);	/* 64 */

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

				 /* Zeroize sensitive information. */
				 memset(x, 0, sizeof(x));
			 }

			 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
			 a multiple of 4.
			 */
			 static void Encode(unsigned char *output, const UINT4 *input, unsigned int len)
			 {
				 unsigned int i, j;
				 UINT4 k;

				 for (i = 0, j = 0; j < len; i++, j += 4) {
					 k = input[i];
					 output[j] = (unsigned char) (k & 0xff);
					 output[j + 1] = (unsigned char) ((k >> 8) & 0xff);
					 output[j + 2] = (unsigned char) ((k >> 16) & 0xff);
					 output[j + 3] = (unsigned char) ((k >> 24) & 0xff);
				 }
			 }

			 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
			 * a multiple of 4.
			 */
			 static void Decode(UINT4 *output, const unsigned char *input, unsigned int len)
			 {
				 unsigned int i, j;

				 for (i = 0, j = 0; j < len; i++, j += 4)
					 output[i] = ((UINT4) input[j]) | (((UINT4) input[j + 1]) << 8) |
					 (((UINT4) input[j + 2]) << 16) | (((UINT4) input[j + 3]) << 24);
			 }

			 /*
			 * The following MD5 password encryption code was largely borrowed from
			 * the FreeBSD 3.0 /usr/src/lib/libcrypt/crypt.c file, which is
			 * licenced as stated at the top of this file.
			 */
			 void ap_to64(char *s, unsigned long v, int n)
			 {
				 static unsigned char itoa64[] =         /* 0 ... 63 => ASCII - 64 */
					 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

				 while (--n >= 0) {
					 *s++ = itoa64[v&0x3f];
					 v >>= 6;
				 }
			 }

			 void ap_MD5Encode(const unsigned char *pw,
				 const unsigned char *salt,
				 char *result, unsigned int nbytes)
			 {
				 /*
				 * Minimum size is 8 bytes for salt, plus 1 for the trailing NUL,
				 * plus 4 for the '$' separators, plus the password hash itself.
				 * Let's leave a goodly amount of leeway.
				 */

				 char passwd[120], *p;
				 const unsigned char *sp, *ep;
				 unsigned char final[16];
				 int i;
				 unsigned int sl;
				 int pl;
				 unsigned int pwlen;
				 AP_MD5_CTX ctx, ctx1;
				 unsigned long l;

				 /* 
				 * Refine the salt first.  It's possible we were given an already-hashed
				 * string as the salt argument, so extract the actual salt value from it
				 * if so.  Otherwise just use the string up to the first '$' as the salt.
				 */
				 sp = salt;

				 /*
				 * If it starts with the magic string, then skip that.
				 */
				 if (strncmp((char *)sp, AP_MD5PW_ID, AP_MD5PW_IDLEN) == 0) {
					 sp += AP_MD5PW_IDLEN;
				 }

				 /*
				 * It stops at the first '$' or 8 chars, whichever comes first
				 */
				 for (ep = sp; (*ep != '\0') && (*ep != '$') && (ep < (sp + 8)); ep++) {
					 continue;
				 }

				 /*
				 * Get the length of the true salt
				 */
				 sl = ep - sp;

				 /*
				 * 'Time to make the doughnuts..'
				 */
				 ap_MD5Init(&ctx);

				 pwlen = strlen((char *)pw);
				 /*
				 * The password first, since that is what is most unknown
				 */
				 ap_MD5Update(&ctx, pw, pwlen);

				 /*
				 * Then our magic string
				 */
				 ap_MD5Update(&ctx, (const unsigned char *) AP_MD5PW_ID, AP_MD5PW_IDLEN);

				 /*
				 * Then the raw salt
				 */
				 ap_MD5Update(&ctx, sp, sl);

				 /*
				 * Then just as many characters of the MD5(pw, salt, pw)
				 */
				 ap_MD5Init(&ctx1);
				 ap_MD5Update(&ctx1, pw, pwlen);
				 ap_MD5Update(&ctx1, sp, sl);
				 ap_MD5Update(&ctx1, pw, pwlen);
				 ap_MD5Final(final, &ctx1);
				 for(pl = pwlen; pl > 0; pl -= 16) {
					 ap_MD5Update(&ctx, final, (pl > 16) ? 16 : (unsigned int) pl);
				 }

				 /*
				 * Don't leave anything around in vm they could use.
				 */
				 memset(final, 0, sizeof(final));

				 /*
				 * Then something really weird...
				 */
				 for (i = pwlen; i != 0; i >>= 1) {
					 if (i & 1) {
						 ap_MD5Update(&ctx, final, 1);
					 }
					 else {
						 ap_MD5Update(&ctx, pw, 1);
					 }
				 }

				 /*
				 * Now make the output string.  We know our limitations, so we
				 * can use the string routines without bounds checking.
				 */
				 ap_cpystrn(passwd, AP_MD5PW_ID, AP_MD5PW_IDLEN + 1);
				 ap_cpystrn(passwd + AP_MD5PW_IDLEN, (char *)sp, sl + 1);
				 passwd[AP_MD5PW_IDLEN + sl]     = '$';
				 passwd[AP_MD5PW_IDLEN + sl + 1] = '\0';

				 ap_MD5Final(final, &ctx);

				 /*
				 * And now, just to make sure things don't run too fast..
				 * On a 60 Mhz Pentium this takes 34 msec, so you would
				 * need 30 seconds to build a 1000 entry dictionary...
				 */
				 for (i = 0; i < 1000; i++) {
					 ap_MD5Init(&ctx1);
					 if (i & 1) {
						 ap_MD5Update(&ctx1, pw, pwlen);
					 }
					 else {
						 ap_MD5Update(&ctx1, final, 16);
					 }
					 if (i % 3) {
						 ap_MD5Update(&ctx1, sp, sl);
					 }

					 if (i % 7) {
						 ap_MD5Update(&ctx1, pw, pwlen);
					 }

					 if (i & 1) {
						 ap_MD5Update(&ctx1, final, 16);
					 }
					 else {
						 ap_MD5Update(&ctx1, pw, pwlen);
					 }
					 ap_MD5Final(final,&ctx1);
				 }

				 p = passwd + strlen(passwd);

				 l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; ap_to64(p, l, 4); p += 4;
				 l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; ap_to64(p, l, 4); p += 4;
				 l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; ap_to64(p, l, 4); p += 4;
				 l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; ap_to64(p, l, 4); p += 4;
				 l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; ap_to64(p, l, 4); p += 4;
				 l =                    final[11]                ; ap_to64(p, l, 2); p += 2;
				 *p = '\0';

				 /*
				 * Don't leave anything around in vm they could use.
				 */
				 memset(final, 0, sizeof(final));

				 ap_cpystrn(result, passwd, nbytes - 1);
			 }

			 void Hash(void* pzData, int nDataLength, unsigned char *pDest, int nBittage)
			 {

				 AP_MD5_CTX my_md5;
				 ap_MD5Init(&my_md5);
				 ap_MD5Update(&my_md5, (unsigned char *)pzData, (unsigned int)nDataLength);
				 ap_MD5Final(pDest, &my_md5);

				 // for now just use 2 identical 128 bit hashes back to back
				 // for a 256 bit hash.  This will be replaced soon.
				 if (nBittage == 256)
				 {
					 AP_MD5_CTX my_md52;
					 ap_MD5Init(&my_md52);
					 ap_MD5Update(&my_md52, (unsigned char *)pzData, (unsigned int)nDataLength);
					 ap_MD5Final(&pDest[16], &my_md52);
				 }

			 }



#endif // USE_IMPL_3