package/x11r7/mcookie/mcookie.c - buildroot - Git at Google

 /* mcookie.c -- Generates random numbers for xauth
  * Created: Fri Feb  3 10:42:48 1995 by faith@cs.unc.edu
  * Revised: Fri Mar 19 07:48:01 1999 by faith@acm.org
  * Public Domain 1995, 1999 Rickard E. Faith (faith@acm.org)
  * This program comes with ABSOLUTELY NO WARRANTY.
  *
  * $Id: mcookie.c,v 1.5 1997/07/06 00:13:06 aebr Exp $
  *
  * This program gathers some random bits of data and used the MD5
  * message-digest algorithm to generate a 128-bit hexadecimal number for
  * use with xauth(1).
  *
  * NOTE: Unless /dev/random is available, this program does not actually
  * gather 128 bits of random information, so the magic cookie generated
  * will be considerably easier to guess than one might expect.
  *
  * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
  * - added Native Language Support
  * 1999-03-21 aeb: Added some fragments of code from Colin Plumb.
  *
  */

 #include <stdio.h>
 #include <stdlib.h>
 #include <fcntl.h>
 #include <sys/time.h>
 #include <time.h>
 #include <unistd.h>

 #define BUFFERSIZE 4096


 #ifndef MD5_H
 #define MD5_H

 #if defined (__alpha__) || defined (__ia64__) || defined (__x86_64__)
 typedef unsigned int uint32;
 #else
 typedef unsigned long uint32;
 #endif

 struct MD5Context {
 	uint32 buf[4];
 	uint32 bits[2];
 	unsigned char in[64];
 };

 void MD5Init(struct MD5Context *context);
 void MD5Update(struct MD5Context *context, unsigned char const *buf,
 	       unsigned len);
 void MD5Final(unsigned char digest[16], struct MD5Context *context);
 void MD5Transform(uint32 buf[4], uint32 const in[16]);

 /*
  * This is needed to make RSAREF happy on some MS-DOS compilers.
  */
 typedef struct MD5Context MD5_CTX;

 #endif /* !MD5_H */


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

 #if __BYTE_ORDER == __LITTLE_ENDIAN
 #define byteReverse(buf, len)	/* Nothing */
 #else
 void byteReverse(unsigned char *buf, unsigned longs);

 /*
  * Note: this code is harmless on little-endian machines.
  */
 void byteReverse(unsigned char *buf, unsigned longs)
 {
     uint32 t;
     do {
 	t = (uint32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
 	    ((unsigned) buf[1] << 8 | buf[0]);
 	*(uint32 *) buf = t;
 	buf += 4;
     } while (--longs);
 }
 #endif

 /*
  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
  * initialization constants.
  */
 void MD5Init(struct MD5Context *ctx)
 {
     ctx->buf[0] = 0x67452301;
     ctx->buf[1] = 0xefcdab89;
     ctx->buf[2] = 0x98badcfe;
     ctx->buf[3] = 0x10325476;

     ctx->bits[0] = 0;
     ctx->bits[1] = 0;
 }

 /*
  * Update context to reflect the concatenation of another buffer full
  * of bytes.
  */
 void MD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len)
 {
     uint32 t;

     /* Update bitcount */

     t = ctx->bits[0];
     if ((ctx->bits[0] = t + ((uint32) len << 3)) < t)
 	ctx->bits[1]++;		/* Carry from low to high */
     ctx->bits[1] += len >> 29;

     t = (t >> 3) & 0x3f;	/* Bytes already in shsInfo->data */

     /* Handle any leading odd-sized chunks */

     if (t) {
 	unsigned char *p = (unsigned char *) ctx->in + t;

 	t = 64 - t;
 	if (len < t) {
 	    memcpy(p, buf, len);
 	    return;
 	}
 	memcpy(p, buf, t);
 	byteReverse(ctx->in, 16);
 	MD5Transform(ctx->buf, (uint32 *) ctx->in);
 	buf += t;
 	len -= t;
     }
     /* Process data in 64-byte chunks */

     while (len >= 64) {
 	memcpy(ctx->in, buf, 64);
 	byteReverse(ctx->in, 16);
 	MD5Transform(ctx->buf, (uint32 *) 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(unsigned char digest[16], struct MD5Context *ctx)
 {
     unsigned count;
     unsigned char *p;

     /* Compute number of bytes mod 64 */
     count = (ctx->bits[0] >> 3) & 0x3F;

     /* Set the first char of padding to 0x80.  This is safe since there is
        always at least one byte free */
     p = ctx->in + count;
     *p++ = 0x80;

     /* Bytes of padding needed to make 64 bytes */
     count = 64 - 1 - count;

     /* Pad out to 56 mod 64 */
     if (count < 8) {
 	/* Two lots of padding:  Pad the first block to 64 bytes */
 	memset(p, 0, count);
 	byteReverse(ctx->in, 16);
 	MD5Transform(ctx->buf, (uint32 *) ctx->in);

 	/* Now fill the next block with 56 bytes */
 	memset(ctx->in, 0, 56);
     } else {
 	/* Pad block to 56 bytes */
 	memset(p, 0, count - 8);
     }
     byteReverse(ctx->in, 14);

     /* Append length in bits and transform */
     ((uint32 *) ctx->in)[14] = ctx->bits[0];
     ((uint32 *) ctx->in)[15] = ctx->bits[1];

     MD5Transform(ctx->buf, (uint32 *) ctx->in);
     byteReverse((unsigned char *) ctx->buf, 4);
     memcpy(digest, ctx->buf, 16);
     memset(ctx, 0, sizeof(ctx));	/* In case it's sensitive */
 }

 /* 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, data, s) \
 	( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += 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(uint32 buf[4], uint32 const in[16])
 {
     register uint32 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;
 }


 struct rngs {
    const char *path;
    int minlength, maxlength;
 } rngs[] = {
    { "/dev/random",              16,  16 }, /* 16 bytes = 128 bits suffice */
    { "/proc/interrupts",          0,   0 },
    { "/proc/slabinfo",            0,   0 },
    { "/proc/stat",                0,   0 },
    { "/dev/urandom",             32,  64 },
 };
 #define RNGS (sizeof(rngs)/sizeof(struct rngs))

 int Verbose = 0;

 /* The basic function to hash a file */
 static off_t
 hash_file(struct MD5Context *ctx, int fd)
 {
    off_t count = 0;
    ssize_t r;
    unsigned char buf[BUFFERSIZE];

    while ((r = read(fd, buf, sizeof(buf))) > 0) {
       MD5Update(ctx, buf, r);
       count += r;
    }
    /* Separate files with a null byte */
    buf[0] = 0;
    MD5Update(ctx, buf, 1);
    return count;
 }

 int main( int argc, char **argv )
 {
    int               i;
    struct MD5Context ctx;
    unsigned char     digest[16];
    unsigned char     buf[BUFFERSIZE];
    int               fd;
    int               c;
    pid_t             pid;
    char              *file = NULL;
    int               r;
    struct timeval    tv;
    struct timezone   tz;

    while ((c = getopt( argc, argv, "vf:" )) != -1)
       switch (c) {
       case 'v': ++Verbose;     break;
       case 'f': file = optarg; break;
       }

    MD5Init( &ctx );

    gettimeofday( &tv, &tz );
    MD5Update( &ctx, (unsigned char *)&tv, sizeof( tv ) );
    pid = getppid();
    MD5Update( &ctx, (unsigned char *)&pid, sizeof( pid ));
    pid = getpid();
    MD5Update( &ctx, (unsigned char *)&pid, sizeof( pid ));

    if (file) {
       int count = 0;

       if (file[0] == '-' && !file[1])
 	 fd = fileno(stdin);
       else
 	 fd = open( file, O_RDONLY );

       if (fd < 0) {
 	 fprintf( stderr, "Could not open %s\n", file );
       } else {
          count = hash_file( &ctx, fd );
 	 if (Verbose)
 	    fprintf( stderr, "Got %d bytes from %s\n", count, file );

 	 if (file[0] != '-' || file[1]) close( fd );
       }
    }

    for (i = 0; i < RNGS; i++) {
       if ((fd = open( rngs[i].path, O_RDONLY|O_NONBLOCK )) >= 0) {
 	 int count = sizeof(buf);

 	 if (rngs[i].maxlength && count > rngs[i].maxlength)
 	    count = rngs[i].maxlength;
 	 r = read( fd, buf, count );
 	 if (r > 0)
 	    MD5Update( &ctx, buf, r );
 	 else
 	    r = 0;
 	 close( fd );
 	 if (Verbose)
 	    fprintf( stderr, "Got %d bytes from %s\n", r, rngs[i].path );
 	 if (rngs[i].minlength && r >= rngs[i].minlength)
 	    break;
       } else if (Verbose)
 	 fprintf( stderr, "Could not open %s\n", rngs[i].path );
    }

    MD5Final( digest, &ctx );
    for (i = 0; i < 16; i++) printf( "%02x", digest[i] );
    putchar ( '\n' );

    /*
     * The following is important for cases like disk full, so shell scripts
     * can bomb out properly rather than think they succeeded.
     */
    if (fflush(stdout) < 0 || fclose(stdout) < 0)
       return 1;

    return 0;
 }
	/* mcookie.c -- Generates random numbers for xauth
	* Created: Fri Feb 3 10:42:48 1995 by faith@cs.unc.edu
	* Revised: Fri Mar 19 07:48:01 1999 by faith@acm.org
	* Public Domain 1995, 1999 Rickard E. Faith (faith@acm.org)
	* This program comes with ABSOLUTELY NO WARRANTY.
	*
	* $Id: mcookie.c,v 1.5 1997/07/06 00:13:06 aebr Exp $
	*
	* This program gathers some random bits of data and used the MD5
	* message-digest algorithm to generate a 128-bit hexadecimal number for
	* use with xauth(1).
	*
	* NOTE: Unless /dev/random is available, this program does not actually
	* gather 128 bits of random information, so the magic cookie generated
	* will be considerably easier to guess than one might expect.
	*
	* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
	* - added Native Language Support
	* 1999-03-21 aeb: Added some fragments of code from Colin Plumb.
	*
	*/

	#include <stdio.h>
	#include <stdlib.h>
	#include <fcntl.h>
	#include <sys/time.h>
	#include <time.h>
	#include <unistd.h>

	#define BUFFERSIZE 4096


	#ifndef MD5_H
	#define MD5_H

	#if defined (__alpha__) \|\| defined (__ia64__) \|\| defined (__x86_64__)
	typedef unsigned int uint32;
	#else
	typedef unsigned long uint32;
	#endif

	struct MD5Context {
	uint32 buf[4];
	uint32 bits[2];
	unsigned char in[64];
	};

	void MD5Init(struct MD5Context *context);
	void MD5Update(struct MD5Context context, unsigned char const buf,
	unsigned len);
	void MD5Final(unsigned char digest[16], struct MD5Context *context);
	void MD5Transform(uint32 buf[4], uint32 const in[16]);

	/*
	* This is needed to make RSAREF happy on some MS-DOS compilers.
	*/
	typedef struct MD5Context MD5_CTX;

	#endif /* !MD5_H */



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

	#if __BYTE_ORDER == __LITTLE_ENDIAN
	#define byteReverse(buf, len) /* Nothing */
	#else
	void byteReverse(unsigned char *buf, unsigned longs);

	/*
	* Note: this code is harmless on little-endian machines.
	*/
	void byteReverse(unsigned char *buf, unsigned longs)
	{
	uint32 t;
	do {
	t = (uint32) ((unsigned) buf[3] << 8 \| buf[2]) << 16 \|
	((unsigned) buf[1] << 8 \| buf[0]);
	(uint32 ) buf = t;
	buf += 4;
	} while (--longs);
	}
	#endif

	/*
	* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
	* initialization constants.
	*/
	void MD5Init(struct MD5Context *ctx)
	{
	ctx->buf[0] = 0x67452301;
	ctx->buf[1] = 0xefcdab89;
	ctx->buf[2] = 0x98badcfe;
	ctx->buf[3] = 0x10325476;

	ctx->bits[0] = 0;
	ctx->bits[1] = 0;
	}

	/*
	* Update context to reflect the concatenation of another buffer full
	* of bytes.
	*/
	void MD5Update(struct MD5Context ctx, unsigned char const buf, unsigned len)
	{
	uint32 t;

	/* Update bitcount */

	t = ctx->bits[0];
	if ((ctx->bits[0] = t + ((uint32) len << 3)) < t)
	ctx->bits[1]++; /* Carry from low to high */
	ctx->bits[1] += len >> 29;

	t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */

	/* Handle any leading odd-sized chunks */

	if (t) {
	unsigned char p = (unsigned char ) ctx->in + t;

	t = 64 - t;
	if (len < t) {
	memcpy(p, buf, len);
	return;
	}
	memcpy(p, buf, t);
	byteReverse(ctx->in, 16);
	MD5Transform(ctx->buf, (uint32 *) ctx->in);
	buf += t;
	len -= t;
	}
	/* Process data in 64-byte chunks */

	while (len >= 64) {
	memcpy(ctx->in, buf, 64);
	byteReverse(ctx->in, 16);
	MD5Transform(ctx->buf, (uint32 *) 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(unsigned char digest[16], struct MD5Context *ctx)
	{
	unsigned count;
	unsigned char *p;

	/* Compute number of bytes mod 64 */
	count = (ctx->bits[0] >> 3) & 0x3F;

	/* Set the first char of padding to 0x80. This is safe since there is
	always at least one byte free */
	p = ctx->in + count;
	*p++ = 0x80;

	/* Bytes of padding needed to make 64 bytes */
	count = 64 - 1 - count;

	/* Pad out to 56 mod 64 */
	if (count < 8) {
	/* Two lots of padding: Pad the first block to 64 bytes */
	memset(p, 0, count);
	byteReverse(ctx->in, 16);
	MD5Transform(ctx->buf, (uint32 *) ctx->in);

	/* Now fill the next block with 56 bytes */
	memset(ctx->in, 0, 56);
	} else {
	/* Pad block to 56 bytes */
	memset(p, 0, count - 8);
	}
	byteReverse(ctx->in, 14);

	/* Append length in bits and transform */
	((uint32 *) ctx->in)[14] = ctx->bits[0];
	((uint32 *) ctx->in)[15] = ctx->bits[1];

	MD5Transform(ctx->buf, (uint32 *) ctx->in);
	byteReverse((unsigned char *) ctx->buf, 4);
	memcpy(digest, ctx->buf, 16);
	memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */
	}

	/* 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, data, s) \
	( w += f(x, y, z) + data, w = w<<s \| w>>(32-s), w += 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(uint32 buf[4], uint32 const in[16])
	{
	register uint32 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;
	}




	struct rngs {
	const char *path;
	int minlength, maxlength;
	} rngs[] = {
	{ "/dev/random", 16, 16 }, /* 16 bytes = 128 bits suffice */
	{ "/proc/interrupts", 0, 0 },
	{ "/proc/slabinfo", 0, 0 },
	{ "/proc/stat", 0, 0 },
	{ "/dev/urandom", 32, 64 },
	};
	#define RNGS (sizeof(rngs)/sizeof(struct rngs))

	int Verbose = 0;

	/* The basic function to hash a file */
	static off_t
	hash_file(struct MD5Context *ctx, int fd)
	{
	off_t count = 0;
	ssize_t r;
	unsigned char buf[BUFFERSIZE];

	while ((r = read(fd, buf, sizeof(buf))) > 0) {
	MD5Update(ctx, buf, r);
	count += r;
	}
	/* Separate files with a null byte */
	buf[0] = 0;
	MD5Update(ctx, buf, 1);
	return count;
	}

	int main( int argc, char **argv )
	{
	int i;
	struct MD5Context ctx;
	unsigned char digest[16];
	unsigned char buf[BUFFERSIZE];
	int fd;
	int c;
	pid_t pid;
	char *file = NULL;
	int r;
	struct timeval tv;
	struct timezone tz;

	while ((c = getopt( argc, argv, "vf:" )) != -1)
	switch (c) {
	case 'v': ++Verbose; break;
	case 'f': file = optarg; break;
	}

	MD5Init( &ctx );

	gettimeofday( &tv, &tz );
	MD5Update( &ctx, (unsigned char *)&tv, sizeof( tv ) );
	pid = getppid();
	MD5Update( &ctx, (unsigned char *)&pid, sizeof( pid ));
	pid = getpid();
	MD5Update( &ctx, (unsigned char *)&pid, sizeof( pid ));

	if (file) {
	int count = 0;

	if (file[0] == '-' && !file[1])
	fd = fileno(stdin);
	else
	fd = open( file, O_RDONLY );

	if (fd < 0) {
	fprintf( stderr, "Could not open %s\n", file );
	} else {
	count = hash_file( &ctx, fd );
	if (Verbose)
	fprintf( stderr, "Got %d bytes from %s\n", count, file );

	if (file[0] != '-' \|\| file[1]) close( fd );
	}
	}

	for (i = 0; i < RNGS; i++) {
	if ((fd = open( rngs[i].path, O_RDONLY\|O_NONBLOCK )) >= 0) {
	int count = sizeof(buf);

	if (rngs[i].maxlength && count > rngs[i].maxlength)
	count = rngs[i].maxlength;
	r = read( fd, buf, count );
	if (r > 0)
	MD5Update( &ctx, buf, r );
	else
	r = 0;
	close( fd );
	if (Verbose)
	fprintf( stderr, "Got %d bytes from %s\n", r, rngs[i].path );
	if (rngs[i].minlength && r >= rngs[i].minlength)
	break;
	} else if (Verbose)
	fprintf( stderr, "Could not open %s\n", rngs[i].path );
	}

	MD5Final( digest, &ctx );
	for (i = 0; i < 16; i++) printf( "%02x", digest[i] );
	putchar ( '\n' );

	/*
	* The following is important for cases like disk full, so shell scripts
	* can bomb out properly rather than think they succeeded.
	*/
	if (fflush(stdout) < 0 \|\| fclose(stdout) < 0)
	return 1;

	return 0;
	}