Release-1.3.4-20031112

1 files changed, 290 insertions, 503 deletions

diff --git a/libmd5/md5.c b/libmd5/md5.c
index a667090..d75105c 100644
--- a/libmd5/md5.c
+++ b/libmd5/md5.c
@@ -1,517 +1,202 @@
-/*
- * Functions to compute MD5 message digest of files or memory blocks
- * according to the definition of MD5 in RFC 1321 from April 1992.
- * Copyright (C) 1995, 1996 Free Software Foundation, Inc.  NOTE: The
- * canonical source of this file is maintained with the GNU C Library.
- * Bugs can be reported to bug-glibc@prep.ai.mit.edu.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
- *
- * Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
- * Modified by Gray Watson <http://256.com/gray/>, 1997.
- *
- * $Id$
+/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
  */
 
-/*
- * NOTE: during quick performance tests on a Sun Sparc Ultra 1 and an
- * Alpha 255 300, these functions performed upwards of 3mb/sec
- * including disk I/O time.
+/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+   rights reserved.
+
+   License to copy and use this software is granted provided that it
+   is identified as the "RSA Data Security, Inc. MD5 Message-Digest
+   Algorithm" in all material mentioning or referencing this software
+   or this function.
+
+   License is also granted to make and use derivative works provided
+   that such works are identified as "derived from the RSA Data
+   Security, Inc. MD5 Message-Digest Algorithm" in all material
+   mentioning or referencing the derived work.  
+                                                                    
+   RSA Data Security, Inc. makes no representations concerning either
+   the merchantability of this software or the suitability of this
+   software for any particular purpose. It is provided "as is"
+   without express or implied warranty of any kind.  
+                                                                    
+   These notices must be retained in any copies of any part of this
+   documentation and/or software.  
  */
 
-/*
- * MD5 Test Suite from RFC1321: http://ds.internic.net:/rfc/rfc1321.txt
- *
- * MD5 ("") = d41d8cd98f00b204e9800998ecf8427e
- * MD5 ("a") = 0cc175b9c0f1b6a831c399e269772661
- * MD5 ("abc") = 900150983cd24fb0d6963f7d28e17f72
- * MD5 ("message digest") = f96b697d7cb7938d525a2f31aaf161d0
- * MD5 ("abcdefghijklmnopqrstuvwxyz") = c3fcd3d76192e4007dfb496cca67e13b
- * MD5 ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") =
- * d174ab98d277d9f5a5611c2c9f419d9f
- * MD5 ("123456789012345678901234567890123456789012345678901234567890123456
- * 78901234567890") = 57edf4a22be3c955ac49da2e2107b67a
- */
+#include "md5_loc.h"
+#include "md5.h"
 
-#include <stdlib.h>
-#include <string.h>
-#include <sys/types.h>
+/* Constants for MD5Transform routine.
+ */
+#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
+
+static void MD5Transform (UINT4 [4], const unsigned char [64]);
+static void Encode(unsigned char *, UINT4 *, unsigned int);
+static void Decode (UINT4 *, const unsigned char *, unsigned int);
+static void MD5_memcpy (POINTER, POINTER, unsigned int);
+static void MD5_memset (POINTER, int, unsigned int);
+
+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
+};
+
+/* F, G, H and I are basic MD5 functions.
+ */
+#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)))
 
-#include "md5.h"
-#include "md5_loc.h"
+/* ROTATE_LEFT rotates x left n bits.
+ */
+#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
 
-#if LIB_VERSION_REQUIRED
-static	char	*rcs_id =
-  "$Id$";
-
-/* version id for the library */
-static char *version_id = "$MD5Version: 1.0.0 November-19-1997 $";
-#endif
-
-/****************************** local routines *******************************/
-
-/*
- * process_block
- *
- * DESCRIPTION:
- *
- * Process a block of bytes into a MD5 state structure.
- *
- * RETURNS:
- *
- * None.
- *
- * ARGUMENTS:
- *
- * md5_p - Pointer to MD5 structure from which we are getting the result.
- *
- * buffer - A buffer of bytes whose MD5 signature we are calculating.
- *
- * buf_len - The length of the buffer.
+/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
+   Rotation is separate from addition to prevent recomputation.
  */
-static	void	process_block(md5_t *md5_p, const void *buffer,
-			      const unsigned int buf_len)
-{
-  md5_uint32	correct[16];
-  const void	*buf_p = buffer, *end_p;
-  unsigned int	words_n;
-  md5_uint32	A, B, C, D;
-
-  words_n = buf_len / sizeof(md5_uint32);
-  end_p = (char *)buf_p + words_n * sizeof(md5_uint32);
-
-  A = md5_p->md_A;
-  B = md5_p->md_B;
-  C = md5_p->md_C;
-  D = md5_p->md_D;
-
-  /*
-   * First increment the byte count.  RFC 1321 specifies the possible
-   * length of the file up to 2^64 bits.  Here we only compute the
-   * number of bytes with a double word increment.  Modified to do
-   * this to better avoid overflows in the lower word -- Gray 10/97.
-   */
-  if (md5_p->md_total[0] > MAX_MD5_UINT32 - buf_len) {
-    md5_p->md_total[1]++;
-    md5_p->md_total[0] -= (MAX_MD5_UINT32 - buf_len);
+#define FF(a, b, c, d, x, s, ac) { \
+    (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
+    (a) = ROTATE_LEFT ((a), (s)); \
+    (a) += (b); \
   }
-  else {
-    md5_p->md_total[0] += buf_len;
+#define GG(a, b, c, d, x, s, ac) { \
+    (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
+    (a) = ROTATE_LEFT ((a), (s)); \
+    (a) += (b); \
   }
-
-  /*
-   * Process all bytes in the buffer with MD5_BLOCK bytes in each
-   * round of the loop.
-   */
-  while (buf_p < end_p) {
-    md5_uint32	A_save, B_save, C_save, D_save;
-    md5_uint32	*corr_p = correct;
-
-    A_save = A;
-    B_save = B;
-    C_save = C;
-    D_save = D;
-
-    /*
-     * Before we start, one word to the strange constants.  They are
-     * defined in RFC 1321 as
-     *
-     * T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..MD5_BLOCK
-     */
-
-    /* Round 1. */
-    OP1 (A, B, C, D, buf_p, corr_p,  7, 0xd76aa478);
-    OP1 (D, A, B, C, buf_p, corr_p, 12, 0xe8c7b756);
-    OP1 (C, D, A, B, buf_p, corr_p, 17, 0x242070db);
-    OP1 (B, C, D, A, buf_p, corr_p, 22, 0xc1bdceee);
-    OP1 (A, B, C, D, buf_p, corr_p,  7, 0xf57c0faf);
-    OP1 (D, A, B, C, buf_p, corr_p, 12, 0x4787c62a);
-    OP1 (C, D, A, B, buf_p, corr_p, 17, 0xa8304613);
-    OP1 (B, C, D, A, buf_p, corr_p, 22, 0xfd469501);
-    OP1 (A, B, C, D, buf_p, corr_p,  7, 0x698098d8);
-    OP1 (D, A, B, C, buf_p, corr_p, 12, 0x8b44f7af);
-    OP1 (C, D, A, B, buf_p, corr_p, 17, 0xffff5bb1);
-    OP1 (B, C, D, A, buf_p, corr_p, 22, 0x895cd7be);
-    OP1 (A, B, C, D, buf_p, corr_p,  7, 0x6b901122);
-    OP1 (D, A, B, C, buf_p, corr_p, 12, 0xfd987193);
-    OP1 (C, D, A, B, buf_p, corr_p, 17, 0xa679438e);
-    OP1 (B, C, D, A, buf_p, corr_p, 22, 0x49b40821);
-
-    /* Round 2. */
-    OP234 (FG, A, B, C, D, correct[  1],  5, 0xf61e2562);
-    OP234 (FG, D, A, B, C, correct[  6],  9, 0xc040b340);
-    OP234 (FG, C, D, A, B, correct[ 11], 14, 0x265e5a51);
-    OP234 (FG, B, C, D, A, correct[  0], 20, 0xe9b6c7aa);
-    OP234 (FG, A, B, C, D, correct[  5],  5, 0xd62f105d);
-    OP234 (FG, D, A, B, C, correct[ 10],  9, 0x02441453);
-    OP234 (FG, C, D, A, B, correct[ 15], 14, 0xd8a1e681);
-    OP234 (FG, B, C, D, A, correct[  4], 20, 0xe7d3fbc8);
-    OP234 (FG, A, B, C, D, correct[  9],  5, 0x21e1cde6);
-    OP234 (FG, D, A, B, C, correct[ 14],  9, 0xc33707d6);
-    OP234 (FG, C, D, A, B, correct[  3], 14, 0xf4d50d87);
-    OP234 (FG, B, C, D, A, correct[  8], 20, 0x455a14ed);
-    OP234 (FG, A, B, C, D, correct[ 13],  5, 0xa9e3e905);
-    OP234 (FG, D, A, B, C, correct[  2],  9, 0xfcefa3f8);
-    OP234 (FG, C, D, A, B, correct[  7], 14, 0x676f02d9);
-    OP234 (FG, B, C, D, A, correct[ 12], 20, 0x8d2a4c8a);
-
-    /* Round 3. */
-    OP234 (FH, A, B, C, D, correct[  5],  4, 0xfffa3942);
-    OP234 (FH, D, A, B, C, correct[  8], 11, 0x8771f681);
-    OP234 (FH, C, D, A, B, correct[ 11], 16, 0x6d9d6122);
-    OP234 (FH, B, C, D, A, correct[ 14], 23, 0xfde5380c);
-    OP234 (FH, A, B, C, D, correct[  1],  4, 0xa4beea44);
-    OP234 (FH, D, A, B, C, correct[  4], 11, 0x4bdecfa9);
-    OP234 (FH, C, D, A, B, correct[  7], 16, 0xf6bb4b60);
-    OP234 (FH, B, C, D, A, correct[ 10], 23, 0xbebfbc70);
-    OP234 (FH, A, B, C, D, correct[ 13],  4, 0x289b7ec6);
-    OP234 (FH, D, A, B, C, correct[  0], 11, 0xeaa127fa);
-    OP234 (FH, C, D, A, B, correct[  3], 16, 0xd4ef3085);
-    OP234 (FH, B, C, D, A, correct[  6], 23, 0x04881d05);
-    OP234 (FH, A, B, C, D, correct[  9],  4, 0xd9d4d039);
-    OP234 (FH, D, A, B, C, correct[ 12], 11, 0xe6db99e5);
-    OP234 (FH, C, D, A, B, correct[ 15], 16, 0x1fa27cf8);
-    OP234 (FH, B, C, D, A, correct[  2], 23, 0xc4ac5665);
-
-    /* Round 4. */
-    OP234 (FI, A, B, C, D, correct[  0],  6, 0xf4292244);
-    OP234 (FI, D, A, B, C, correct[  7], 10, 0x432aff97);
-    OP234 (FI, C, D, A, B, correct[ 14], 15, 0xab9423a7);
-    OP234 (FI, B, C, D, A, correct[  5], 21, 0xfc93a039);
-    OP234 (FI, A, B, C, D, correct[ 12],  6, 0x655b59c3);
-    OP234 (FI, D, A, B, C, correct[  3], 10, 0x8f0ccc92);
-    OP234 (FI, C, D, A, B, correct[ 10], 15, 0xffeff47d);
-    OP234 (FI, B, C, D, A, correct[  1], 21, 0x85845dd1);
-    OP234 (FI, A, B, C, D, correct[  8],  6, 0x6fa87e4f);
-    OP234 (FI, D, A, B, C, correct[ 15], 10, 0xfe2ce6e0);
-    OP234 (FI, C, D, A, B, correct[  6], 15, 0xa3014314);
-    OP234 (FI, B, C, D, A, correct[ 13], 21, 0x4e0811a1);
-    OP234 (FI, A, B, C, D, correct[  4],  6, 0xf7537e82);
-    OP234 (FI, D, A, B, C, correct[ 11], 10, 0xbd3af235);
-    OP234 (FI, C, D, A, B, correct[  2], 15, 0x2ad7d2bb);
-    OP234 (FI, B, C, D, A, correct[  9], 21, 0xeb86d391);
-
-    /* Add the starting values of the context. */
-    A += A_save;
-    B += B_save;
-    C += C_save;
-    D += D_save;
+#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); \
   }
 
-  /* Put checksum in context given as argument. */
-  md5_p->md_A = A;
-  md5_p->md_B = B;
-  md5_p->md_C = C;
-  md5_p->md_D = D;
-}
-
-/*
- * md5_get_result
- *
- * DESCRIPTION:
- *
- * Copy the resulting MD5 signature from MD5_P into the first 16 bytes
- * (MD5_SIZE) of the result buffer.
- *
- * RETURNS:
- *
- * None.
- *
- * ARGUMENTS:
- *
- * md5_p - Pointer to MD5 structure from which we are getting the result.
- *
- * result - A 16 byte buffer that will contain the MD5 signature.
+/* MD5 initialization. Begins an MD5 operation, writing a new context.
  */
-static	void	md5_get_result(const md5_t *md5_p, void *result)
+void MD5Init (MD5_CTX *context)
 {
-  md5_uint32	hold;
-  void		*res_p = result;
+  context->count[0] = context->count[1] = 0;
 
-  hold = SWAP(md5_p->md_A);
-  memcpy(res_p, &hold, sizeof(md5_uint32));
-  res_p = (char *)res_p + sizeof(md5_uint32);
-
-  hold = SWAP(md5_p->md_B);
-  memcpy(res_p, &hold, sizeof(md5_uint32));
-  res_p = (char *)res_p + sizeof(md5_uint32);
-
-  hold = SWAP(md5_p->md_C);
-  memcpy(res_p, &hold, sizeof(md5_uint32));
-  res_p = (char *)res_p + sizeof(md5_uint32);
-
-  hold = SWAP(md5_p->md_D);
-  memcpy(res_p, &hold, sizeof(md5_uint32));
+  /* Load magic initialization constants.
+   */
+  context->state[0] = 0x67452301;
+  context->state[1] = 0xefcdab89;
+  context->state[2] = 0x98badcfe;
+  context->state[3] = 0x10325476;
 }
 
-/***************************** exported routines *****************************/
-
-/*
- * md5_init
- *
- * DESCRIPTION:
- *
- * Initialize structure containing state of MD5 computation. (RFC 1321,
- * 3.3: Step 3).  This is for progressive MD5 calculations only.  If
- * you have the complete string available, md5_buffer should be used.
- * md5_process should be called for each bunch of bytes and after the
- * last process call, md5_finish should be called to get the
- * signature.
- *
- * RETURNS:
- *
- * None.
- *
- * ARGUMENTS:
- *
- * md5_p - Pointer to md5 structure that we are initializing.
+/* MD5 block update operation. Continues an MD5 message-digest
+     operation, processing another message block, and updating the
+     context.
  */
-void	md5_init(md5_t *md5_p)
+void MD5Update (MD5_CTX *context, const unsigned char *input, unsigned int inputLen)
 {
-  md5_p->md_A = 0x67452301;
-  md5_p->md_B = 0xefcdab89;
-  md5_p->md_C = 0x98badcfe;
-  md5_p->md_D = 0x10325476;
-
-  md5_p->md_total[0] = 0;
-  md5_p->md_total[1] = 0;
-  md5_p->md_buf_len = 0;
-}
+  unsigned int i, index, partLen;
 
-/*
- * md5_process
- *
- * DESCRIPTION:
- *
- * This function is used to progressively calculate a MD5 signature some
- * number of bytes at a time.  If you have the complete string
- * available, md5_buffer should be used.  The MD5 structure should
- * have been initialized with md5_init and after the last process
- * call, md5_finish should be called to get the results.
- *
- * RETURNS:
- *
- * None.
- *
- * ARGUMENTS:
- *
- * md5_p - Pointer to MD5 structure which we are progressively updating.
- *
- * buffer - A buffer of bytes whose MD5 signature we are calculating.
- *
- * buf_len - The length of the buffer.
- */
-void	md5_process(md5_t *md5_p, const void *buffer,
-		    const unsigned int buf_len)
-{
-  unsigned int	len = buf_len;
-  unsigned int	in_block, add;
+  /* Compute number of bytes mod 64 */
+  index = (unsigned int)((context->count[0] >> 3) & 0x3F);
 
-  /*
-   * When we already have some bytes in our internal buffer, copy some
-   * from the user to fill the block.
+  /* 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 - index;
+  
+  /* Transform as many times as possible.
    */
-  if (md5_p->md_buf_len > 0) {
+  if (inputLen >= partLen) {
+    MD5_memcpy
+      ((POINTER)&context->buffer[index], (POINTER)input, partLen);
+    MD5Transform (context->state, context->buffer);
+  
+    for (i = partLen; i + 63 < inputLen; i += 64)
+      MD5Transform (context->state, &input[i]);
     
-    in_block = md5_p->md_buf_len;
-    if (in_block + len > sizeof(md5_p->md_buffer)) {
-      add = sizeof(md5_p->md_buffer) - in_block;
-    }
-    else {
-      add = len;
-    }
-
-    memcpy (md5_p->md_buffer + in_block, buffer, add);
-    md5_p->md_buf_len += add;
-    in_block += add;
-
-    if (in_block > MD5_BLOCK_SIZE) {
-      process_block (md5_p, md5_p->md_buffer, in_block & ~BLOCK_SIZE_MASK);
-      /* the regions in the following copy operation will not overlap. */
-      memcpy (md5_p->md_buffer,
-	      md5_p->md_buffer + (in_block & ~BLOCK_SIZE_MASK),
-	      in_block & BLOCK_SIZE_MASK);
-      md5_p->md_buf_len = in_block & BLOCK_SIZE_MASK;
-    }
-
-    buffer = (const char *)buffer + add;
-    len -= add;
-  }
-
-  /* process available complete blocks right from the user buffer */
-  if (len > MD5_BLOCK_SIZE) {
-    process_block (md5_p, buffer, len & ~BLOCK_SIZE_MASK);
-    buffer = (const char *) buffer + (len & ~BLOCK_SIZE_MASK);
-    len &= BLOCK_SIZE_MASK;
-  }
-
-  /* copy remaining bytes into the internal buffer */
-  if (len > 0) {
-    memcpy (md5_p->md_buffer, buffer, len);
-    md5_p->md_buf_len = len;
+    index = 0;
   }
+  else
+    i = 0;
+  
+  /* Buffer remaining input */
+  MD5_memcpy 
+    ((POINTER)&context->buffer[index], (POINTER)&input[i],
+     inputLen-i);
 }
 
-/*
- * md5_finish
- *
- * DESCRIPTION:
- *
- * Finish a progressing MD5 calculation and copy the resulting MD5
- * signature into the result buffer which should be 16 bytes
- * (MD5_SIZE).  After this call, the MD5 structure is invalid.
- *
- * RETURNS:
- *
- * None.
- *
- * ARGUMENTS:
- *
- * md5_p - Pointer to MD5 structure which we are finishing.
- *
- * signature - A 16 byte buffer that will contain the MD5 signature.
+/* MD5 finalization. Ends an MD5 message-digest operation, writing the
+     the message digest and zeroizing the context.
  */
-void	md5_finish(md5_t *md5_p, void *signature)
+void MD5Final (MD5_CTX *context, unsigned char digest[16])
 {
-  md5_uint32	bytes, hold;
-  int		pad;
+  unsigned char bits[8];
+  unsigned int index, padLen;
 
-  /* take yet unprocessed bytes into account */
-  bytes = md5_p->md_buf_len;
+  /* Save number of bits */
+  Encode (bits, context->count, 8);
 
-  /*
-   * Count remaining bytes.  Modified to do this to better avoid
-   * overflows in the lower word -- Gray 10/97.
+  /* Pad out to 56 mod 64.
    */
-  if (md5_p->md_total[0] > MAX_MD5_UINT32 - bytes) {
-    md5_p->md_total[1]++;
-    md5_p->md_total[0] -= (MAX_MD5_UINT32 - bytes);
-  }
-  else {
-    md5_p->md_total[0] += bytes;
-  }
-
-  /*
-   * Pad the buffer to the next MD5_BLOCK-byte boundary.  (RFC 1321,
-   * 3.1: Step 1).  We need enough room for two size words and the
-   * bytes left in the buffer.  For some reason even if we are equal
-   * to the block-size, we add an addition block of pad bytes.
-   */
-  pad = MD5_BLOCK_SIZE - (sizeof(md5_uint32) * 2) - bytes;
-  if (pad <= 0) {
-    pad += MD5_BLOCK_SIZE;
-  }
+  index = (unsigned int)((context->count[0] >> 3) & 0x3f);
+  padLen = (index < 56) ? (56 - index) : (120 - index);
+  MD5Update (context, PADDING, padLen);
+  
+  /* Append length (before padding) */
+  MD5Update (context, bits, 8);
 
-  /*
-   * Modified from a fixed array to this assignment and memset to be
-   * more flexible with block-sizes -- Gray 10/97.
+  /* Store state in digest */
+  Encode (digest, context->state, 16);
+  
+  /* Zeroize sensitive information.
    */
-  if (pad > 0) {
-    /* some sort of padding start byte */
-    md5_p->md_buffer[bytes] = (unsigned char)0x80;
-    if (pad > 1) {
-      memset (md5_p->md_buffer + bytes + 1, 0, pad - 1);
-    }
-    bytes += pad;
-  }
-
-  /* put the 64-bit file length in _bits_ (i.e. *8) at the end of the buffer */
-  hold = SWAP(md5_p->md_total[0] << 3);
-  memcpy(md5_p->md_buffer + bytes, &hold, sizeof(md5_uint32));
-  bytes += sizeof(md5_uint32);
-
-  /* shift the high word over by 3 and add in the top 3 bits from the low */
-  hold = SWAP((md5_p->md_total[1] << 3) | (md5_p->md_total[0] >> 29));
-  memcpy(md5_p->md_buffer + bytes, &hold, sizeof(md5_uint32));
-  bytes += sizeof(md5_uint32);
-
-  /* process last bytes, the padding chars, and size words */
-  process_block(md5_p, md5_p->md_buffer, bytes);
-  md5_get_result(md5_p, signature);
+  MD5_memset ((POINTER)context, 0, sizeof (*context));
 }
 
-/*
- * md5_buffer
- *
- * DESCRIPTION:
- *
- * This function is used to calculate a MD5 signature for a buffer of
- * bytes.  If you only have part of a buffer that you want to process
- * then md5_init, md5_process, and md5_finish should be used.
- *
- * RETURNS:
- *
- * None.
- *
- * ARGUMENTS:
- *
- * buffer - A buffer of bytes whose MD5 signature we are calculating.
- *
- * buf_len - The length of the buffer.
- *
- * signature - A 16 byte buffer that will contain the MD5 signature.
- */
-void	md5_buffer(const char *buffer, const unsigned int buf_len,
-		   void *signature)
+void MD5Buffer (const char *buf,unsigned int len,unsigned char sig[16])
 {
-  md5_t		md5;
-
-  /* initialize the computation context */
-  md5_init(&md5);
-
-  /* process whole buffer but last buf_len % MD5_BLOCK bytes */
-  md5_process(&md5, buffer, buf_len);
-
-  /* put result in desired memory area */
-  md5_finish(&md5, signature);
+  MD5_CTX md5;
+  MD5Init(&md5);
+  MD5Update(&md5,buf,len);
+  MD5Final(&md5,sig);
 }
 
-/*
- * md5_sig_to_string
- *
- * DESCRIPTION:
- *
- * Convert a MD5 signature in a 16 byte buffer into a hexadecimal string
- * representation.
- *
- * RETURNS:
- *
- * None.
- *
- * ARGUMENTS:
- *
- * signature - a 16 byte buffer that contains the MD5 signature.
- *
- * str - a string of charactes which should be at least 33 bytes long (2
- * characters per MD5 byte and 1 for the \0).
- *
- * str_len - the length of the string.
- */
-void	md5_sig_to_string(void *signature, char *str, const int str_len)
+#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;
-  
+  unsigned char *sig_p;
+  char          *str_p, *max_p;
+  unsigned int  high, low;
+
   str_p = str;
-  max_p = str + str_len;
-  
+  max_p = str + len;
+
   for (sig_p = (unsigned char *)signature;
-       sig_p < (unsigned char *)signature + MD5_SIZE;
-       sig_p++) {
+      sig_p < (unsigned char *)signature + 16;
+      sig_p++) 
+  {
     high = *sig_p / 16;
     low = *sig_p % 16;
     /* account for 2 chars */
@@ -527,39 +212,141 @@ void	md5_sig_to_string(void *signature, char *str, const int str_len)
   }
 }
 
-/*
- * md5_sig_from_string
- *
- * DESCRIPTION:
- *
- * Convert a MD5 signature from a hexadecimal string representation into
- * a 16 byte buffer.
- *
- * RETURNS:
- *
- * None.
- *
- * ARGUMENTS:
- *
- * signature - A 16 byte buffer that will contain the MD5 signature.
- *
- * str - A string of charactes which _must_ be at least 32 bytes long (2
- * characters per MD5 byte).
+/* MD5 basic transformation. Transforms state based on block.
  */
-void	md5_sig_from_string(void *signature, const char *str)
+static void MD5Transform (UINT4 state[4], const unsigned char block[64])
 {
-  unsigned char	*sig_p;
-  const char	*str_p;
-  char		*hex;
-  unsigned int	high, low, val;
+  UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
   
-  hex = HEX_STRING;
-  sig_p = signature;
+  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;
   
-  for (str_p = str; str_p < str + MD5_SIZE * 2; str_p += 2) {
-    high = strchr(hex, *str_p) - hex;
-    low = strchr(hex, *(str_p + 1)) - hex;
-    val = high * 16 + low;
-    *sig_p++ = val;
+  /* Zeroize sensitive information.
+   */
+  MD5_memset ((POINTER)x, 0, sizeof (x));
+}
+
+/* Encodes input (UINT4) into output (unsigned char). Assumes len is
+     a multiple of 4.
+ */
+static void Encode (unsigned char *output, UINT4 *input, unsigned int len)
+{
+  unsigned int i, j;
+
+  for (i = 0, j = 0; j < len; i++, j += 4) {
+    output[j] = (unsigned char)(input[i] & 0xff);
+    output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
+    output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
+    output[j+3] = (unsigned char)((input[i] >> 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);
+}
+
+/* Note: Replace "for loop" with standard memcpy if possible.
+ */
+static void MD5_memcpy (POINTER output, POINTER input, unsigned int len)
+{
+  unsigned int i;
+  
+  for (i = 0; i < len; i++)
+    output[i] = input[i];
+}
+
+/* Note: Replace "for loop" with standard memset if possible.
+ */
+static void MD5_memset (POINTER output, int value, unsigned int len)
+{
+  unsigned int i;
+  
+  for (i = 0; i < len; i++)
+    ((char *)output)[i] = (char)value;
+}
+
+