md5c.cpp

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/* MD5C.cpp */

#include <malloc.h>
#include <stdio.h>
#include <string.h>

#include "stdafx.h"

#define MD5_DIGESTSIZE 16

typedef unsigned int UINT4;
typedef struct {
    UINT4 state[4];				// state (ABCD)
    UINT4 count[2];				// number of bits, modulo 2^64 (lsb first)
    unsigned char buffer[64];	// input buffer
} MD5_CTX;

#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21
#define MD5PW_ID "$MD5C$"
#define MD5PW_IDLEN 6

static void MD5Transform(UINT4 state[4], const unsigned char block[64]);
static void Encode(unsigned char *output, const UINT4 *input, unsigned int len);
static void Decode(UINT4 *output, const unsigned char *input, unsigned int len);

static unsigned char PADDING[64] =
{
    0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

#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)))
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
#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); \
  }

void MD5Init(MD5_CTX *context)
{
    context->count[0] = context->count[1] = 0;
    context->state[0] = 0x67452301;
    context->state[1] = 0xefcdab89;
    context->state[2] = 0x98badcfe;
    context->state[3] = 0x10325476;
}

void MD5Update(MD5_CTX *context, const unsigned char *input, unsigned int inputLen)
{
	unsigned int i, idx, partLen;

	idx = (unsigned int) ((context->count[0] >> 3) & 0x3F);
	if ((context->count[0] += ((UINT4) inputLen << 3)) < ((UINT4) inputLen << 3))
		context->count[1]++;
	context->count[1] += (UINT4) inputLen >> 29;
	partLen = 64 - idx;
	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;
    }
	memcpy(&context->buffer[idx], &input[i], inputLen - i);
}

void MD5Final(unsigned char digest[16], MD5_CTX *context)
{
	unsigned char bits[8];
	unsigned int idx, padLen;

	Encode(bits, context->count, 8);
	idx = (unsigned int) ((context->count[0] >> 3) & 0x3f);
	padLen = (idx < 56) ? (56 - idx) : (120 - idx);
	MD5Update(context, (const unsigned char *)PADDING, padLen);
	MD5Update(context, (const unsigned char *)bits, 8);
	Encode(digest, context->state, 16);
	memset(context, 0, sizeof(*context));
}

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);
	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 */
	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 */
	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 */
	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;
	memset(x, 0, sizeof(x));
}

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);
	}
}

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);
	}
}

void Base64(char *s, unsigned long v, int n)
{
	static unsigned char itoa64[] =
	"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

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

void MD5Encode(const unsigned char *pw,
			   const unsigned char *salt,
			   char *result, size_t nbytes)
{
	char passwd[120], *p;
	const unsigned char *sp, *ep;
	unsigned char final[16];
	int i;
	unsigned int sl;
	int pl;
	unsigned int pwlen;
	MD5_CTX ctx, ctx1;
	unsigned long l;

	sp = salt;
	if (strncmp((char *)sp, MD5PW_ID, MD5PW_IDLEN) == 0)
	{
		sp += MD5PW_IDLEN;
	}
	for (ep = sp; (*ep != '\0') && (*ep != '$') && (ep < (sp + 8)); ep++)
	{
		continue;
	}
	sl = ep - sp;
	MD5Init(&ctx);
	pwlen = strlen((char *)pw);
	MD5Update(&ctx, pw, pwlen);
	MD5Update(&ctx, (const unsigned char *) MD5PW_ID, MD5PW_IDLEN);
	MD5Update(&ctx, sp, sl);
	MD5Init(&ctx1);
	MD5Update(&ctx1, pw, pwlen);
	MD5Update(&ctx1, sp, sl);
	MD5Update(&ctx1, pw, pwlen);
	MD5Final(final, &ctx1);
	for (pl = pwlen; pl > 0; pl -= 16)
	{
		MD5Update(&ctx, final, (pl > 16) ? 16 : (unsigned int) pl);
	}
	memset(final, 0, sizeof(final));
	for (i = pwlen; i != 0; i >>= 1)
	{
		if (i & 1)
		{
			MD5Update(&ctx, final, 1);
		}
		else
		{
			MD5Update(&ctx, pw, 1);
		}
    }
	strncpy(passwd, MD5PW_ID, MD5PW_IDLEN + 1);
	strncpy(passwd + MD5PW_IDLEN, (char *)sp, sl + 1);
	passwd[MD5PW_IDLEN + sl]     = '$';
	passwd[MD5PW_IDLEN + sl + 1] = '\0';

	MD5Final(final, &ctx);
    for (i = 0; i < 1000; i++)
	{
		MD5Init(&ctx1);
		if (i & 1)
		{
			MD5Update(&ctx1, pw, pwlen);
		}
		else
		{
			MD5Update(&ctx1, final, 16);
		}
		if (i % 3)
		{
			MD5Update(&ctx1, sp, sl);
		}
		if (i % 7)
		{
			MD5Update(&ctx1, pw, pwlen);
		}
		if (i & 1)
		{
			MD5Update(&ctx1, final, 16);
		}
		else
		{
			MD5Update(&ctx1, pw, pwlen);
		}
		MD5Final(final,&ctx1);
	}
	p = passwd + strlen(passwd);
	l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; Base64(p, l, 4); p += 4;
	l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; Base64(p, l, 4); p += 4;
	l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; Base64(p, l, 4); p += 4;
	l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; Base64(p, l, 4); p += 4;
	l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; Base64(p, l, 4); p += 4;
	l =                    final[11]                ; Base64(p, l, 2); p += 2;
	*p = '\0';
    memset(final, 0, sizeof(final));

    strncpy(result, passwd, nbytes - 1);
	result[nbytes-1] = '\0';
}

char *MD5Binary(const unsigned char *buf, int length)
{
	const char *hex = "0123456789abcdef";
	MD5_CTX my_md5;
	unsigned char hash[16];
	char *r, result[33];
	int i;

	MD5Init(&my_md5);
	MD5Update(&my_md5, buf, (unsigned int)length);
	MD5Final(hash, &my_md5);

	for (i = 0, r = result; i < 16; i++)
	{
		*r++ = hex[hash[i] >> 4];
		*r++ = hex[hash[i] & 0xF];
	}
	*r = '\0';

    return strdup(result);
}

static char basis_64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

char *MD5ContextTo64(MD5_CTX * context)
{
	unsigned char digest[18];
	char *encodedDigest;
	int i;
	char *p;

	encodedDigest = (char *) malloc(25 * sizeof(char));
	MD5Final(digest, context);
	digest[sizeof(digest) - 1] = digest[sizeof(digest) - 2] = 0;
	p = encodedDigest;
	for (i = 0; i < sizeof(digest); i += 3)
	{
		*p++ = basis_64[digest[i] >> 2];
		*p++ = basis_64[((digest[i] & 0x3) << 4) | ((int) (digest[i + 1] & 0xF0) >> 4)];
		*p++ = basis_64[((digest[i + 1] & 0xF) << 2) | ((int) (digest[i + 2] & 0xC0) >> 6)];
		*p++ = basis_64[digest[i + 2] & 0x3F];
	}
	*p-- = '\0';
	*p-- = '=';
	*p-- = '=';

	return encodedDigest;
}

char *MD5Digest(FILE *infile)
{
	MD5_CTX context;
	unsigned char buf[1000];
	unsigned int nbytes;

	MD5Init(&context);
	while ((nbytes = fread(buf, 1, sizeof(buf), infile)))
	{
		MD5Update(&context, buf, nbytes);
	}
	return MD5ContextTo64(&context);
}

char *MD5Digest2(unsigned char *buf, unsigned int nBytes)
{
	static MD5_CTX context;

	if (nBytes == 0)
	{
		MD5Init(&context);
		return NULL;
	}
	else if (nBytes == 0xFFFF)
	{
		return MD5ContextTo64(&context);
	}
	MD5Update(&context, buf, nBytes);

	return NULL;
}