/*

 * This code implements the MD5 message-digest algorithm.

 * The algorithm is due to Ron Rivest.  This code was

 * written by Colin Plumb in 1993, no copyright is claimed.

 * This code is in the public domain; do with it what you wish.

 *

 * Equivalent code is available from RSA Data Security, Inc.

 * This code has been tested against that, and is equivalent,

 * except that you don't need to include two pages of legalese

 * with every copy.

 *

 * To compute the message digest of a chunk of bytes, declare an

 * MD5Context structure, pass it to MD5Init, call MD5Update as

 * needed on buffers full of bytes, and then call MD5Final, which

 * will fill a supplied 16-byte array with the digest.

 *

 * Changed so as no longer to depend on Colin Plumb's `usual.h' header

 * definitions; now uses stuff from dpkg's config.h.

 *  - Ian Jackson <ian@chiark.greenend.org.uk>.

 * Still in the public domain.

 */

#include <string.h>		/* for memcpy() */

#include <sys/types.h>		/* for stupid systems */

#include "md5.h"

void

MD5Transform(UWORD32 buf[4], UWORD32 const in[16]);

int g_bigEndian = 0;

int g_endianessDetected = 0;

static void 

detectEndianess()

{

  int nl = 0x12345678;

  short ns = 0x1234;

  unsigned char *p = (unsigned char *)(&nl); 

  unsigned char *sp = (unsigned char *)(&ns);

  if (g_endianessDetected) return;

  if ( p[0] == 0x12 && p[1] == 0x34 && p[2] == 0x56 && p[3] == 0x78 )

  {

    g_bigEndian = 1;

  }

  else if ( p[0] == 0x78 && p[1] == 0x56 && p[2] == 0x34 && p[3] == 0x12 )

  {

    g_bigEndian = 0;

  }

  else

  {

    g_bigEndian = *sp != 0x12;

  }

  g_endianessDetected=1;

}

static void

byteSwap(UWORD32 *buf, unsigned words)

{

        md5byte *p;

        if (!g_bigEndian) return;

	p = (md5byte *)buf;

	do {

		*buf++ = (UWORD32)((unsigned)p[3] << 8 | p[2]) << 16 |

			((unsigned)p[1] << 8 | p[0]);

		p += 4;

	} while (--words);

}

/*

 * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious

 * initialization constants.

 */

void

MD5Init(struct MD5Context *ctx)

{

        detectEndianess();

	ctx->buf[0] = 0x67452301;

	ctx->buf[1] = 0xefcdab89;

	ctx->buf[2] = 0x98badcfe;

	ctx->buf[3] = 0x10325476;

	ctx->bytes[0] = 0;

	ctx->bytes[1] = 0;

}

/*

 * Update context to reflect the concatenation of another buffer full

 * of bytes.

 */

void

MD5Update(struct MD5Context *ctx, md5byte const *buf, unsigned len)

{

	UWORD32 t;

	/* Update byte count */

	t = ctx->bytes[0];

	if ((ctx->bytes[0] = t + len) < t)

		ctx->bytes[1]++;	/* Carry from low to high */

	t = 64 - (t & 0x3f);	/* Space available in ctx->in (at least 1) */

	if (t > len) {

		memcpy((md5byte *)ctx->in + 64 - t, buf, len);

		return;

	}

	/* First chunk is an odd size */

	memcpy((md5byte *)ctx->in + 64 - t, buf, t);

	byteSwap(ctx->in, 16);

	MD5Transform(ctx->buf, ctx->in);

	buf += t;

	len -= t;

	/* Process data in 64-byte chunks */

	while (len >= 64) {

		memcpy(ctx->in, buf, 64);

		byteSwap(ctx->in, 16);

		MD5Transform(ctx->buf, ctx->in);

		buf += 64;

		len -= 64;

	}

	/* Handle any remaining bytes of data. */

	memcpy(ctx->in, buf, len);

}

/*

 * Final wrapup - pad to 64-byte boundary with the bit pattern 

 * 1 0* (64-bit count of bits processed, MSB-first)

 */

void

MD5Final(md5byte digest[16], struct MD5Context *ctx)

{

	int count = ctx->bytes[0] & 0x3f;	/* Number of bytes in ctx->in */

	md5byte *p = (md5byte *)ctx->in + count;

	/* Set the first char of padding to 0x80.  There is always room. */

	*p++ = 0x80;

	/* Bytes of padding needed to make 56 bytes (-8..55) */

	count = 56 - 1 - count;

	if (count < 0) {	/* Padding forces an extra block */

		memset(p, 0, count + 8);

		byteSwap(ctx->in, 16);

		MD5Transform(ctx->buf, ctx->in);

		p = (md5byte *)ctx->in;

		count = 56;

	}

	memset(p, 0, count);

	byteSwap(ctx->in, 14);

	/* Append length in bits and transform */

	ctx->in[14] = ctx->bytes[0] << 3;

	ctx->in[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29;

	MD5Transform(ctx->buf, ctx->in);

	byteSwap(ctx->buf, 4);

	memcpy(digest, ctx->buf, 16);

	memset(ctx, 0, sizeof(ctx));	/* In case it's sensitive */

}

#ifndef ASM_MD5

/* The four core functions - F1 is optimized somewhat */

/* #define F1(x, y, z) (x & y | ~x & z) */

#define F1(x, y, z) (z ^ (x & (y ^ z)))

#define F2(x, y, z) F1(z, x, y)

#define F3(x, y, z) (x ^ y ^ z)

#define F4(x, y, z) (y ^ (x | ~z))

/* This is the central step in the MD5 algorithm. */

#define MD5STEP(f,w,x,y,z,in,s) \

	 (w += f(x,y,z) + in, w = (w<<s | w>>(32-s)) + x)

/*

 * The core of the MD5 algorithm, this alters an existing MD5 hash to

 * reflect the addition of 16 longwords of new data.  MD5Update blocks

 * the data and converts bytes into longwords for this routine.

 */

void

MD5Transform(UWORD32 buf[4], UWORD32 const in[16])

{

	register UWORD32 a, b, c, d;

	a = buf[0];

	b = buf[1];

	c = buf[2];

	d = buf[3];

	MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);

	MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);

	MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);

	MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);

	MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);

	MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);

	MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);

	MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);

	MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);

	MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);

	MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);

	MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);

	MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);

	MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);

	MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);

	MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);

	MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);

	MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);

	MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);

	MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);

	MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);

	MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);

	MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);

	MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);

	MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);

	MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);

	MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);

	MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);

	MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);

	MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);

	MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);

	MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);

	MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);

	MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);

	MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);

	MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);

	MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);

	MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);

	MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);

	MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);

	MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);

	MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);

	MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);

	MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);

	MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);

	MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);

	MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);

	MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);

	MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);

	MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);

	MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);

	MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);

	MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);

	MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);

	MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);

	MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);

	MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);

	MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);

	MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);

	MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);

	MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);

	MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);

	MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);

	MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);

	buf[0] += a;

	buf[1] += b;

	buf[2] += c;

	buf[3] += d;

}

#endif

void MD5Buffer (const unsigned char *buf,unsigned int len,unsigned char sig[16])

{

  struct MD5Context md5;

  MD5Init(&md5);

  MD5Update(&md5,buf,len);

  MD5Final(sig,&md5);

}

#define HEX_STRING      "0123456789abcdef"      /* to convert to hex */

void MD5SigToString(unsigned char signature[16],char *str,int len)

{

  unsigned char *sig_p;

  char          *str_p, *max_p;

  unsigned int  high, low;

  str_p = str;

  max_p = str + len;

  for (sig_p = (unsigned char *)signature;

      sig_p < (unsigned char *)signature + 16;

      sig_p++)

  {

    high = *sig_p / 16;

    low = *sig_p % 16;

    /* account for 2 chars */

    if (str_p + 1 >= max_p) {

      break;

    }

    *str_p++ = HEX_STRING[high];

    *str_p++ = HEX_STRING[low];

  }

  /* account for 2 chars */

  if (str_p < max_p) {

    *str_p++ = '\0';

  }

}