src/hashes/md5.c - third_party/dropbear - Git at Google

 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
  *
  * LibTomCrypt is a library that provides various cryptographic
  * algorithms in a highly modular and flexible manner.
  *
  * The library is free for all purposes without any express
  * guarantee it works.
  *
  * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com
  */
 #include "tomcrypt.h"


 /**
   @file md5.c
   MD5 hash function by Tom St Denis
 */

 #ifdef MD5

 const struct ltc_hash_descriptor md5_desc =
 {
     "md5",
     3,
     16,
     64,

     /* OID */
    { 1, 2, 840, 113549, 2, 5,  },
    6,

     &md5_init,
     &md5_process,
     &md5_done,
     &md5_test,
     NULL
 };

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

 #ifdef LTC_SMALL_CODE

 #define FF(a,b,c,d,M,s,t) \
     a = (a + F(b,c,d) + M + t); a = ROL(a, s) + b;

 #define GG(a,b,c,d,M,s,t) \
     a = (a + G(b,c,d) + M + t); a = ROL(a, s) + b;

 #define HH(a,b,c,d,M,s,t) \
     a = (a + H(b,c,d) + M + t); a = ROL(a, s) + b;

 #define II(a,b,c,d,M,s,t) \
     a = (a + I(b,c,d) + M + t); a = ROL(a, s) + b;

 static const unsigned char Worder[64] = {
    0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
    1,6,11,0,5,10,15,4,9,14,3,8,13,2,7,12,
    5,8,11,14,1,4,7,10,13,0,3,6,9,12,15,2,
    0,7,14,5,12,3,10,1,8,15,6,13,4,11,2,9
 };

 static const unsigned char Rorder[64] = {
    7,12,17,22,7,12,17,22,7,12,17,22,7,12,17,22,
    5,9,14,20,5,9,14,20,5,9,14,20,5,9,14,20,
    4,11,16,23,4,11,16,23,4,11,16,23,4,11,16,23,
    6,10,15,21,6,10,15,21,6,10,15,21,6,10,15,21
 };

 static const ulong32 Korder[64] = {
 0xd76aa478UL, 0xe8c7b756UL, 0x242070dbUL, 0xc1bdceeeUL, 0xf57c0fafUL, 0x4787c62aUL, 0xa8304613UL, 0xfd469501UL,
 0x698098d8UL, 0x8b44f7afUL, 0xffff5bb1UL, 0x895cd7beUL, 0x6b901122UL, 0xfd987193UL, 0xa679438eUL, 0x49b40821UL,
 0xf61e2562UL, 0xc040b340UL, 0x265e5a51UL, 0xe9b6c7aaUL, 0xd62f105dUL, 0x02441453UL, 0xd8a1e681UL, 0xe7d3fbc8UL,
 0x21e1cde6UL, 0xc33707d6UL, 0xf4d50d87UL, 0x455a14edUL, 0xa9e3e905UL, 0xfcefa3f8UL, 0x676f02d9UL, 0x8d2a4c8aUL,
 0xfffa3942UL, 0x8771f681UL, 0x6d9d6122UL, 0xfde5380cUL, 0xa4beea44UL, 0x4bdecfa9UL, 0xf6bb4b60UL, 0xbebfbc70UL,
 0x289b7ec6UL, 0xeaa127faUL, 0xd4ef3085UL, 0x04881d05UL, 0xd9d4d039UL, 0xe6db99e5UL, 0x1fa27cf8UL, 0xc4ac5665UL,
 0xf4292244UL, 0x432aff97UL, 0xab9423a7UL, 0xfc93a039UL, 0x655b59c3UL, 0x8f0ccc92UL, 0xffeff47dUL, 0x85845dd1UL,
 0x6fa87e4fUL, 0xfe2ce6e0UL, 0xa3014314UL, 0x4e0811a1UL, 0xf7537e82UL, 0xbd3af235UL, 0x2ad7d2bbUL, 0xeb86d391UL
 };

 #else

 #define FF(a,b,c,d,M,s,t) \
     a = (a + F(b,c,d) + M + t); a = ROLc(a, s) + b;

 #define GG(a,b,c,d,M,s,t) \
     a = (a + G(b,c,d) + M + t); a = ROLc(a, s) + b;

 #define HH(a,b,c,d,M,s,t) \
     a = (a + H(b,c,d) + M + t); a = ROLc(a, s) + b;

 #define II(a,b,c,d,M,s,t) \
     a = (a + I(b,c,d) + M + t); a = ROLc(a, s) + b;


 #endif

 #ifdef LTC_CLEAN_STACK
 static int _md5_compress(hash_state *md, unsigned char *buf)
 #else
 static int  md5_compress(hash_state *md, unsigned char *buf)
 #endif
 {
     ulong32 i, W[16], a, b, c, d;
 #ifdef LTC_SMALL_CODE
     ulong32 t;
 #endif

     /* copy the state into 512-bits into W[0..15] */
     for (i = 0; i < 16; i++) {
         LOAD32L(W[i], buf + (4*i));
     }

     /* copy state */
     a = md->md5.state[0];
     b = md->md5.state[1];
     c = md->md5.state[2];
     d = md->md5.state[3];

 #ifdef LTC_SMALL_CODE
     for (i = 0; i < 16; ++i) {
         FF(a,b,c,d,W[Worder[i]],Rorder[i],Korder[i]);
         t = d; d = c; c = b; b = a; a = t;
     }

     for (; i < 32; ++i) {
         GG(a,b,c,d,W[Worder[i]],Rorder[i],Korder[i]);
         t = d; d = c; c = b; b = a; a = t;
     }

     for (; i < 48; ++i) {
         HH(a,b,c,d,W[Worder[i]],Rorder[i],Korder[i]);
         t = d; d = c; c = b; b = a; a = t;
     }

     for (; i < 64; ++i) {
         II(a,b,c,d,W[Worder[i]],Rorder[i],Korder[i]);
         t = d; d = c; c = b; b = a; a = t;
     }

 #else
     FF(a,b,c,d,W[0],7,0xd76aa478UL)
     FF(d,a,b,c,W[1],12,0xe8c7b756UL)
     FF(c,d,a,b,W[2],17,0x242070dbUL)
     FF(b,c,d,a,W[3],22,0xc1bdceeeUL)
     FF(a,b,c,d,W[4],7,0xf57c0fafUL)
     FF(d,a,b,c,W[5],12,0x4787c62aUL)
     FF(c,d,a,b,W[6],17,0xa8304613UL)
     FF(b,c,d,a,W[7],22,0xfd469501UL)
     FF(a,b,c,d,W[8],7,0x698098d8UL)
     FF(d,a,b,c,W[9],12,0x8b44f7afUL)
     FF(c,d,a,b,W[10],17,0xffff5bb1UL)
     FF(b,c,d,a,W[11],22,0x895cd7beUL)
     FF(a,b,c,d,W[12],7,0x6b901122UL)
     FF(d,a,b,c,W[13],12,0xfd987193UL)
     FF(c,d,a,b,W[14],17,0xa679438eUL)
     FF(b,c,d,a,W[15],22,0x49b40821UL)
     GG(a,b,c,d,W[1],5,0xf61e2562UL)
     GG(d,a,b,c,W[6],9,0xc040b340UL)
     GG(c,d,a,b,W[11],14,0x265e5a51UL)
     GG(b,c,d,a,W[0],20,0xe9b6c7aaUL)
     GG(a,b,c,d,W[5],5,0xd62f105dUL)
     GG(d,a,b,c,W[10],9,0x02441453UL)
     GG(c,d,a,b,W[15],14,0xd8a1e681UL)
     GG(b,c,d,a,W[4],20,0xe7d3fbc8UL)
     GG(a,b,c,d,W[9],5,0x21e1cde6UL)
     GG(d,a,b,c,W[14],9,0xc33707d6UL)
     GG(c,d,a,b,W[3],14,0xf4d50d87UL)
     GG(b,c,d,a,W[8],20,0x455a14edUL)
     GG(a,b,c,d,W[13],5,0xa9e3e905UL)
     GG(d,a,b,c,W[2],9,0xfcefa3f8UL)
     GG(c,d,a,b,W[7],14,0x676f02d9UL)
     GG(b,c,d,a,W[12],20,0x8d2a4c8aUL)
     HH(a,b,c,d,W[5],4,0xfffa3942UL)
     HH(d,a,b,c,W[8],11,0x8771f681UL)
     HH(c,d,a,b,W[11],16,0x6d9d6122UL)
     HH(b,c,d,a,W[14],23,0xfde5380cUL)
     HH(a,b,c,d,W[1],4,0xa4beea44UL)
     HH(d,a,b,c,W[4],11,0x4bdecfa9UL)
     HH(c,d,a,b,W[7],16,0xf6bb4b60UL)
     HH(b,c,d,a,W[10],23,0xbebfbc70UL)
     HH(a,b,c,d,W[13],4,0x289b7ec6UL)
     HH(d,a,b,c,W[0],11,0xeaa127faUL)
     HH(c,d,a,b,W[3],16,0xd4ef3085UL)
     HH(b,c,d,a,W[6],23,0x04881d05UL)
     HH(a,b,c,d,W[9],4,0xd9d4d039UL)
     HH(d,a,b,c,W[12],11,0xe6db99e5UL)
     HH(c,d,a,b,W[15],16,0x1fa27cf8UL)
     HH(b,c,d,a,W[2],23,0xc4ac5665UL)
     II(a,b,c,d,W[0],6,0xf4292244UL)
     II(d,a,b,c,W[7],10,0x432aff97UL)
     II(c,d,a,b,W[14],15,0xab9423a7UL)
     II(b,c,d,a,W[5],21,0xfc93a039UL)
     II(a,b,c,d,W[12],6,0x655b59c3UL)
     II(d,a,b,c,W[3],10,0x8f0ccc92UL)
     II(c,d,a,b,W[10],15,0xffeff47dUL)
     II(b,c,d,a,W[1],21,0x85845dd1UL)
     II(a,b,c,d,W[8],6,0x6fa87e4fUL)
     II(d,a,b,c,W[15],10,0xfe2ce6e0UL)
     II(c,d,a,b,W[6],15,0xa3014314UL)
     II(b,c,d,a,W[13],21,0x4e0811a1UL)
     II(a,b,c,d,W[4],6,0xf7537e82UL)
     II(d,a,b,c,W[11],10,0xbd3af235UL)
     II(c,d,a,b,W[2],15,0x2ad7d2bbUL)
     II(b,c,d,a,W[9],21,0xeb86d391UL)
 #endif

     md->md5.state[0] = md->md5.state[0] + a;
     md->md5.state[1] = md->md5.state[1] + b;
     md->md5.state[2] = md->md5.state[2] + c;
     md->md5.state[3] = md->md5.state[3] + d;

     return CRYPT_OK;
 }

 #ifdef LTC_CLEAN_STACK
 static int md5_compress(hash_state *md, unsigned char *buf)
 {
    int err;
    err = _md5_compress(md, buf);
    burn_stack(sizeof(ulong32) * 21);
    return err;
 }
 #endif

 /**
    Initialize the hash state
    @param md   The hash state you wish to initialize
    @return CRYPT_OK if successful
 */
 int md5_init(hash_state * md)
 {
    LTC_ARGCHK(md != NULL);
    md->md5.state[0] = 0x67452301UL;
    md->md5.state[1] = 0xefcdab89UL;
    md->md5.state[2] = 0x98badcfeUL;
    md->md5.state[3] = 0x10325476UL;
    md->md5.curlen = 0;
    md->md5.length = 0;
    return CRYPT_OK;
 }

 /**
    Process a block of memory though the hash
    @param md     The hash state
    @param in     The data to hash
    @param inlen  The length of the data (octets)
    @return CRYPT_OK if successful
 */
 HASH_PROCESS(md5_process, md5_compress, md5, 64)

 /**
    Terminate the hash to get the digest
    @param md  The hash state
    @param out [out] The destination of the hash (16 bytes)
    @return CRYPT_OK if successful
 */
 int md5_done(hash_state * md, unsigned char *out)
 {
     int i;

     LTC_ARGCHK(md  != NULL);
     LTC_ARGCHK(out != NULL);

     if (md->md5.curlen >= sizeof(md->md5.buf)) {
        return CRYPT_INVALID_ARG;
     }


     /* increase the length of the message */
     md->md5.length += md->md5.curlen * 8;

     /* append the '1' bit */
     md->md5.buf[md->md5.curlen++] = (unsigned char)0x80;

     /* if the length is currently above 56 bytes we append zeros
      * then compress.  Then we can fall back to padding zeros and length
      * encoding like normal.
      */
     if (md->md5.curlen > 56) {
         while (md->md5.curlen < 64) {
             md->md5.buf[md->md5.curlen++] = (unsigned char)0;
         }
         md5_compress(md, md->md5.buf);
         md->md5.curlen = 0;
     }

     /* pad upto 56 bytes of zeroes */
     while (md->md5.curlen < 56) {
         md->md5.buf[md->md5.curlen++] = (unsigned char)0;
     }

     /* store length */
     STORE64L(md->md5.length, md->md5.buf+56);
     md5_compress(md, md->md5.buf);

     /* copy output */
     for (i = 0; i < 4; i++) {
         STORE32L(md->md5.state[i], out+(4*i));
     }
 #ifdef LTC_CLEAN_STACK
     zeromem(md, sizeof(hash_state));
 #endif
     return CRYPT_OK;
 }

 /**
   Self-test the hash
   @return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled
 */
 int  md5_test(void)
 {
  #ifndef LTC_TEST
     return CRYPT_NOP;
  #else
   static const struct {
       char *msg;
       unsigned char hash[16];
   } tests[] = {
     { "",
       { 0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04,
         0xe9, 0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e } },
     { "a",
       {0x0c, 0xc1, 0x75, 0xb9, 0xc0, 0xf1, 0xb6, 0xa8,
        0x31, 0xc3, 0x99, 0xe2, 0x69, 0x77, 0x26, 0x61 } },
     { "abc",
       { 0x90, 0x01, 0x50, 0x98, 0x3c, 0xd2, 0x4f, 0xb0,
         0xd6, 0x96, 0x3f, 0x7d, 0x28, 0xe1, 0x7f, 0x72 } },
     { "message digest",
       { 0xf9, 0x6b, 0x69, 0x7d, 0x7c, 0xb7, 0x93, 0x8d,
         0x52, 0x5a, 0x2f, 0x31, 0xaa, 0xf1, 0x61, 0xd0 } },
     { "abcdefghijklmnopqrstuvwxyz",
       { 0xc3, 0xfc, 0xd3, 0xd7, 0x61, 0x92, 0xe4, 0x00,
         0x7d, 0xfb, 0x49, 0x6c, 0xca, 0x67, 0xe1, 0x3b } },
     { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
       { 0xd1, 0x74, 0xab, 0x98, 0xd2, 0x77, 0xd9, 0xf5,
         0xa5, 0x61, 0x1c, 0x2c, 0x9f, 0x41, 0x9d, 0x9f } },
     { "12345678901234567890123456789012345678901234567890123456789012345678901234567890",
       { 0x57, 0xed, 0xf4, 0xa2, 0x2b, 0xe3, 0xc9, 0x55,
         0xac, 0x49, 0xda, 0x2e, 0x21, 0x07, 0xb6, 0x7a } },
     { NULL, { 0 } }
   };

   int i;
   unsigned char tmp[16];
   hash_state md;

   for (i = 0; tests[i].msg != NULL; i++) {
       md5_init(&md);
       md5_process(&md, (unsigned char *)tests[i].msg, (unsigned long)strlen(tests[i].msg));
       md5_done(&md, tmp);
       if (XMEMCMP(tmp, tests[i].hash, 16) != 0) {
          return CRYPT_FAIL_TESTVECTOR;
       }
   }
   return CRYPT_OK;
  #endif
 }

 #endif


 /* $Source: /cvs/libtom/libtomcrypt/src/hashes/md5.c,v $ */
 /* $Revision: 1.8 $ */
 /* $Date: 2006/11/01 09:28:17 $ */
	/* LibTomCrypt, modular cryptographic library -- Tom St Denis
	*
	* LibTomCrypt is a library that provides various cryptographic
	* algorithms in a highly modular and flexible manner.
	*
	* The library is free for all purposes without any express
	* guarantee it works.
	*
	* Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com
	*/
	#include "tomcrypt.h"


	/**
	@file md5.c
	MD5 hash function by Tom St Denis
	*/

	#ifdef MD5

	const struct ltc_hash_descriptor md5_desc =
	{
	"md5",
	3,
	16,
	64,

	/* OID */
	{ 1, 2, 840, 113549, 2, 5, },
	6,

	&md5_init,
	&md5_process,
	&md5_done,
	&md5_test,
	NULL
	};

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

	#ifdef LTC_SMALL_CODE

	#define FF(a,b,c,d,M,s,t) \
	a = (a + F(b,c,d) + M + t); a = ROL(a, s) + b;

	#define GG(a,b,c,d,M,s,t) \
	a = (a + G(b,c,d) + M + t); a = ROL(a, s) + b;

	#define HH(a,b,c,d,M,s,t) \
	a = (a + H(b,c,d) + M + t); a = ROL(a, s) + b;

	#define II(a,b,c,d,M,s,t) \
	a = (a + I(b,c,d) + M + t); a = ROL(a, s) + b;

	static const unsigned char Worder[64] = {
	0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
	1,6,11,0,5,10,15,4,9,14,3,8,13,2,7,12,
	5,8,11,14,1,4,7,10,13,0,3,6,9,12,15,2,
	0,7,14,5,12,3,10,1,8,15,6,13,4,11,2,9
	};

	static const unsigned char Rorder[64] = {
	7,12,17,22,7,12,17,22,7,12,17,22,7,12,17,22,
	5,9,14,20,5,9,14,20,5,9,14,20,5,9,14,20,
	4,11,16,23,4,11,16,23,4,11,16,23,4,11,16,23,
	6,10,15,21,6,10,15,21,6,10,15,21,6,10,15,21
	};

	static const ulong32 Korder[64] = {
	0xd76aa478UL, 0xe8c7b756UL, 0x242070dbUL, 0xc1bdceeeUL, 0xf57c0fafUL, 0x4787c62aUL, 0xa8304613UL, 0xfd469501UL,
	0x698098d8UL, 0x8b44f7afUL, 0xffff5bb1UL, 0x895cd7beUL, 0x6b901122UL, 0xfd987193UL, 0xa679438eUL, 0x49b40821UL,
	0xf61e2562UL, 0xc040b340UL, 0x265e5a51UL, 0xe9b6c7aaUL, 0xd62f105dUL, 0x02441453UL, 0xd8a1e681UL, 0xe7d3fbc8UL,
	0x21e1cde6UL, 0xc33707d6UL, 0xf4d50d87UL, 0x455a14edUL, 0xa9e3e905UL, 0xfcefa3f8UL, 0x676f02d9UL, 0x8d2a4c8aUL,
	0xfffa3942UL, 0x8771f681UL, 0x6d9d6122UL, 0xfde5380cUL, 0xa4beea44UL, 0x4bdecfa9UL, 0xf6bb4b60UL, 0xbebfbc70UL,
	0x289b7ec6UL, 0xeaa127faUL, 0xd4ef3085UL, 0x04881d05UL, 0xd9d4d039UL, 0xe6db99e5UL, 0x1fa27cf8UL, 0xc4ac5665UL,
	0xf4292244UL, 0x432aff97UL, 0xab9423a7UL, 0xfc93a039UL, 0x655b59c3UL, 0x8f0ccc92UL, 0xffeff47dUL, 0x85845dd1UL,
	0x6fa87e4fUL, 0xfe2ce6e0UL, 0xa3014314UL, 0x4e0811a1UL, 0xf7537e82UL, 0xbd3af235UL, 0x2ad7d2bbUL, 0xeb86d391UL
	};

	#else

	#define FF(a,b,c,d,M,s,t) \
	a = (a + F(b,c,d) + M + t); a = ROLc(a, s) + b;

	#define GG(a,b,c,d,M,s,t) \
	a = (a + G(b,c,d) + M + t); a = ROLc(a, s) + b;

	#define HH(a,b,c,d,M,s,t) \
	a = (a + H(b,c,d) + M + t); a = ROLc(a, s) + b;

	#define II(a,b,c,d,M,s,t) \
	a = (a + I(b,c,d) + M + t); a = ROLc(a, s) + b;


	#endif

	#ifdef LTC_CLEAN_STACK
	static int _md5_compress(hash_state md, unsigned char buf)
	#else
	static int md5_compress(hash_state md, unsigned char buf)
	#endif
	{
	ulong32 i, W[16], a, b, c, d;
	#ifdef LTC_SMALL_CODE
	ulong32 t;
	#endif

	/* copy the state into 512-bits into W[0..15] */
	for (i = 0; i < 16; i++) {
	LOAD32L(W[i], buf + (4*i));
	}

	/* copy state */
	a = md->md5.state[0];
	b = md->md5.state[1];
	c = md->md5.state[2];
	d = md->md5.state[3];

	#ifdef LTC_SMALL_CODE
	for (i = 0; i < 16; ++i) {
	FF(a,b,c,d,W[Worder[i]],Rorder[i],Korder[i]);
	t = d; d = c; c = b; b = a; a = t;
	}

	for (; i < 32; ++i) {
	GG(a,b,c,d,W[Worder[i]],Rorder[i],Korder[i]);
	t = d; d = c; c = b; b = a; a = t;
	}

	for (; i < 48; ++i) {
	HH(a,b,c,d,W[Worder[i]],Rorder[i],Korder[i]);
	t = d; d = c; c = b; b = a; a = t;
	}

	for (; i < 64; ++i) {
	II(a,b,c,d,W[Worder[i]],Rorder[i],Korder[i]);
	t = d; d = c; c = b; b = a; a = t;
	}

	#else
	FF(a,b,c,d,W[0],7,0xd76aa478UL)
	FF(d,a,b,c,W[1],12,0xe8c7b756UL)
	FF(c,d,a,b,W[2],17,0x242070dbUL)
	FF(b,c,d,a,W[3],22,0xc1bdceeeUL)
	FF(a,b,c,d,W[4],7,0xf57c0fafUL)
	FF(d,a,b,c,W[5],12,0x4787c62aUL)
	FF(c,d,a,b,W[6],17,0xa8304613UL)
	FF(b,c,d,a,W[7],22,0xfd469501UL)
	FF(a,b,c,d,W[8],7,0x698098d8UL)
	FF(d,a,b,c,W[9],12,0x8b44f7afUL)
	FF(c,d,a,b,W[10],17,0xffff5bb1UL)
	FF(b,c,d,a,W[11],22,0x895cd7beUL)
	FF(a,b,c,d,W[12],7,0x6b901122UL)
	FF(d,a,b,c,W[13],12,0xfd987193UL)
	FF(c,d,a,b,W[14],17,0xa679438eUL)
	FF(b,c,d,a,W[15],22,0x49b40821UL)
	GG(a,b,c,d,W[1],5,0xf61e2562UL)
	GG(d,a,b,c,W[6],9,0xc040b340UL)
	GG(c,d,a,b,W[11],14,0x265e5a51UL)
	GG(b,c,d,a,W[0],20,0xe9b6c7aaUL)
	GG(a,b,c,d,W[5],5,0xd62f105dUL)
	GG(d,a,b,c,W[10],9,0x02441453UL)
	GG(c,d,a,b,W[15],14,0xd8a1e681UL)
	GG(b,c,d,a,W[4],20,0xe7d3fbc8UL)
	GG(a,b,c,d,W[9],5,0x21e1cde6UL)
	GG(d,a,b,c,W[14],9,0xc33707d6UL)
	GG(c,d,a,b,W[3],14,0xf4d50d87UL)
	GG(b,c,d,a,W[8],20,0x455a14edUL)
	GG(a,b,c,d,W[13],5,0xa9e3e905UL)
	GG(d,a,b,c,W[2],9,0xfcefa3f8UL)
	GG(c,d,a,b,W[7],14,0x676f02d9UL)
	GG(b,c,d,a,W[12],20,0x8d2a4c8aUL)
	HH(a,b,c,d,W[5],4,0xfffa3942UL)
	HH(d,a,b,c,W[8],11,0x8771f681UL)
	HH(c,d,a,b,W[11],16,0x6d9d6122UL)
	HH(b,c,d,a,W[14],23,0xfde5380cUL)
	HH(a,b,c,d,W[1],4,0xa4beea44UL)
	HH(d,a,b,c,W[4],11,0x4bdecfa9UL)
	HH(c,d,a,b,W[7],16,0xf6bb4b60UL)
	HH(b,c,d,a,W[10],23,0xbebfbc70UL)
	HH(a,b,c,d,W[13],4,0x289b7ec6UL)
	HH(d,a,b,c,W[0],11,0xeaa127faUL)
	HH(c,d,a,b,W[3],16,0xd4ef3085UL)
	HH(b,c,d,a,W[6],23,0x04881d05UL)
	HH(a,b,c,d,W[9],4,0xd9d4d039UL)
	HH(d,a,b,c,W[12],11,0xe6db99e5UL)
	HH(c,d,a,b,W[15],16,0x1fa27cf8UL)
	HH(b,c,d,a,W[2],23,0xc4ac5665UL)
	II(a,b,c,d,W[0],6,0xf4292244UL)
	II(d,a,b,c,W[7],10,0x432aff97UL)
	II(c,d,a,b,W[14],15,0xab9423a7UL)
	II(b,c,d,a,W[5],21,0xfc93a039UL)
	II(a,b,c,d,W[12],6,0x655b59c3UL)
	II(d,a,b,c,W[3],10,0x8f0ccc92UL)
	II(c,d,a,b,W[10],15,0xffeff47dUL)
	II(b,c,d,a,W[1],21,0x85845dd1UL)
	II(a,b,c,d,W[8],6,0x6fa87e4fUL)
	II(d,a,b,c,W[15],10,0xfe2ce6e0UL)
	II(c,d,a,b,W[6],15,0xa3014314UL)
	II(b,c,d,a,W[13],21,0x4e0811a1UL)
	II(a,b,c,d,W[4],6,0xf7537e82UL)
	II(d,a,b,c,W[11],10,0xbd3af235UL)
	II(c,d,a,b,W[2],15,0x2ad7d2bbUL)
	II(b,c,d,a,W[9],21,0xeb86d391UL)
	#endif

	md->md5.state[0] = md->md5.state[0] + a;
	md->md5.state[1] = md->md5.state[1] + b;
	md->md5.state[2] = md->md5.state[2] + c;
	md->md5.state[3] = md->md5.state[3] + d;

	return CRYPT_OK;
	}

	#ifdef LTC_CLEAN_STACK
	static int md5_compress(hash_state md, unsigned char buf)
	{
	int err;
	err = _md5_compress(md, buf);
	burn_stack(sizeof(ulong32) * 21);
	return err;
	}
	#endif

	/**
	Initialize the hash state
	@param md The hash state you wish to initialize
	@return CRYPT_OK if successful
	*/
	int md5_init(hash_state * md)
	{
	LTC_ARGCHK(md != NULL);
	md->md5.state[0] = 0x67452301UL;
	md->md5.state[1] = 0xefcdab89UL;
	md->md5.state[2] = 0x98badcfeUL;
	md->md5.state[3] = 0x10325476UL;
	md->md5.curlen = 0;
	md->md5.length = 0;
	return CRYPT_OK;
	}

	/**
	Process a block of memory though the hash
	@param md The hash state
	@param in The data to hash
	@param inlen The length of the data (octets)
	@return CRYPT_OK if successful
	*/
	HASH_PROCESS(md5_process, md5_compress, md5, 64)

	/**
	Terminate the hash to get the digest
	@param md The hash state
	@param out [out] The destination of the hash (16 bytes)
	@return CRYPT_OK if successful
	*/
	int md5_done(hash_state * md, unsigned char *out)
	{
	int i;

	LTC_ARGCHK(md != NULL);
	LTC_ARGCHK(out != NULL);

	if (md->md5.curlen >= sizeof(md->md5.buf)) {
	return CRYPT_INVALID_ARG;
	}


	/* increase the length of the message */
	md->md5.length += md->md5.curlen * 8;

	/* append the '1' bit */
	md->md5.buf[md->md5.curlen++] = (unsigned char)0x80;

	/* if the length is currently above 56 bytes we append zeros
	* then compress. Then we can fall back to padding zeros and length
	* encoding like normal.
	*/
	if (md->md5.curlen > 56) {
	while (md->md5.curlen < 64) {
	md->md5.buf[md->md5.curlen++] = (unsigned char)0;
	}
	md5_compress(md, md->md5.buf);
	md->md5.curlen = 0;
	}

	/* pad upto 56 bytes of zeroes */
	while (md->md5.curlen < 56) {
	md->md5.buf[md->md5.curlen++] = (unsigned char)0;
	}

	/* store length */
	STORE64L(md->md5.length, md->md5.buf+56);
	md5_compress(md, md->md5.buf);

	/* copy output */
	for (i = 0; i < 4; i++) {
	STORE32L(md->md5.state[i], out+(4*i));
	}
	#ifdef LTC_CLEAN_STACK
	zeromem(md, sizeof(hash_state));
	#endif
	return CRYPT_OK;
	}

	/**
	Self-test the hash
	@return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled
	*/
	int md5_test(void)
	{
	#ifndef LTC_TEST
	return CRYPT_NOP;
	#else
	static const struct {
	char *msg;
	unsigned char hash[16];
	} tests[] = {
	{ "",
	{ 0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04,
	0xe9, 0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e } },
	{ "a",
	{0x0c, 0xc1, 0x75, 0xb9, 0xc0, 0xf1, 0xb6, 0xa8,
	0x31, 0xc3, 0x99, 0xe2, 0x69, 0x77, 0x26, 0x61 } },
	{ "abc",
	{ 0x90, 0x01, 0x50, 0x98, 0x3c, 0xd2, 0x4f, 0xb0,
	0xd6, 0x96, 0x3f, 0x7d, 0x28, 0xe1, 0x7f, 0x72 } },
	{ "message digest",
	{ 0xf9, 0x6b, 0x69, 0x7d, 0x7c, 0xb7, 0x93, 0x8d,
	0x52, 0x5a, 0x2f, 0x31, 0xaa, 0xf1, 0x61, 0xd0 } },
	{ "abcdefghijklmnopqrstuvwxyz",
	{ 0xc3, 0xfc, 0xd3, 0xd7, 0x61, 0x92, 0xe4, 0x00,
	0x7d, 0xfb, 0x49, 0x6c, 0xca, 0x67, 0xe1, 0x3b } },
	{ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
	{ 0xd1, 0x74, 0xab, 0x98, 0xd2, 0x77, 0xd9, 0xf5,
	0xa5, 0x61, 0x1c, 0x2c, 0x9f, 0x41, 0x9d, 0x9f } },
	{ "12345678901234567890123456789012345678901234567890123456789012345678901234567890",
	{ 0x57, 0xed, 0xf4, 0xa2, 0x2b, 0xe3, 0xc9, 0x55,
	0xac, 0x49, 0xda, 0x2e, 0x21, 0x07, 0xb6, 0x7a } },
	{ NULL, { 0 } }
	};

	int i;
	unsigned char tmp[16];
	hash_state md;

	for (i = 0; tests[i].msg != NULL; i++) {
	md5_init(&md);
	md5_process(&md, (unsigned char *)tests[i].msg, (unsigned long)strlen(tests[i].msg));
	md5_done(&md, tmp);
	if (XMEMCMP(tmp, tests[i].hash, 16) != 0) {
	return CRYPT_FAIL_TESTVECTOR;
	}
	}
	return CRYPT_OK;
	#endif
	}

	#endif



	/* $Source: /cvs/libtom/libtomcrypt/src/hashes/md5.c,v $ */
	/* $Revision: 1.8 $ */
	/* $Date: 2006/11/01 09:28:17 $ */