mMD5.c

/*=================================================================
 * mMD5.c 
 * example for illustrating how to open a file from MATLAB
 * and perform an MD5 checksum.
 *
 * takes a file name and no return values. Matlab6p5 version and VC6++
 * Reference: MD5 in C by Tian-tai Huynh
 *=============================================================*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include "mex.h"

int  LONG  = 0;
char UNE_LIGNE = '0';

#ifndef MD
#define MD 5
#endif
#define MD5 5

#if MD == MD5
#define MD_CTX MD5_CTX
#define MDInit MD5Init
#define MDUpdate MD5Update
#define MDFinal MD5Final
#endif

/* POINTER defines a generic pointer type */
typedef unsigned char *POINTER;

/* UINT2 defines a two byte word */
typedef unsigned short int UINT2;

/* UINT4 defines a four byte word */
typedef unsigned long int UINT4;


/* MD5.H - header file for MD5C.C */

/* MD5 context. */
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;

void MD5Init             ( MD5_CTX * );
void MD5Update           ( MD5_CTX *, unsigned char *, unsigned int );
void MD5Final            ( unsigned char [16], MD5_CTX * );
static void MD5Transform ( UINT4 [4], unsigned char [64]);
static void Encode       ( unsigned char *, UINT4 *, unsigned int );
static void MDString     ( char * , char *);
static void mMDFile       ( char *, char * );
static void MDPrint      ( unsigned char [16], char *);

/* 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 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)))

/* ROTATE_LEFT rotates x left n bits. */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
 */
#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); \
  }

/* MD5 initialization. Begins an MD5 operation, writing a new context.
=======================================================================
*/
void MD5Init (MD5_CTX *context)
{
  context->count[0] = context->count[1] = 0;
  /* Load magic initialization constants.*/
  context->state[0] = 0x67452301;
  context->state[1] = 0xefcdab89;
  context->state[2] = 0x98badcfe;
  context->state[3] = 0x10325476;
}

/* MD5 block update operation. Continues an MD5 message-digest
  operation, processing another message block, and updating the
  context.*/
void MD5Update (MD5_CTX *context, unsigned char *input, unsigned int inputLen)
{
  unsigned int i, index, partLen;

  /* Compute number of bytes mod 64 */
  index = (unsigned int)((context->count[0] >> 3) & 0x3F);

  /* 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 (inputLen >= partLen) {
    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]);

    index = 0;
  }
  else
    i = 0;

  /* Buffer remaining input */
  memcpy ((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
}

/* MD5 finalization. Ends an MD5 message-digest operation, writing the
  the message digest and zeroing the context.*/
void MD5Final (unsigned char digest[16], MD5_CTX *context)
{
  unsigned char bits[8];
  unsigned int index, padLen;

  /* Save number of bits */
  Encode (bits, context->count, 8);

  /* Pad out to 56 mod 64.*/
  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);

  /* Store state in digest */
  Encode (digest, context->state, 16);

  /* Zero sensitive information.*/
  memset ((POINTER)context, 0, sizeof (*context));
}

/* MD5 basic transformation. Transforms state based on block */
static void MD5Transform (UINT4 state[4], unsigned char block[64])
{
  UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

  unsigned int i, j;

  for (i = 0, j = 0; j < 64; i++, j += 4){
    x[i] = ((UINT4)block[j]) | (((UINT4)block[j+1]) << 8) |
   (((UINT4)block[j+2]) << 16) | (((UINT4)block[j+3]) << 24);
}  
  
  /* 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;

   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);
  }
}

/* Digests a string and prints the result */
static void MDString (char *string, char *outbuf)
{
  MD_CTX context;
  unsigned char digest[16];
  unsigned int len = strlen (string);

  MDInit (&context);
  MDUpdate (&context, (unsigned char*)string, len);
  MDFinal (digest, &context);

  /*printf ("MD%d (\"%s\") = ", MD, string);*/
  MDPrint (digest, outbuf);
  /*printf ("\n");*/
}

static void mMDFile (char *filename, char *output)
{
  FILE *file;
  MD_CTX context;
  int len,i;
  int nb_car_x;
  long ind1, ind2=0;
  unsigned char buffer[1024], buffer2[1024], digest[16], outbuf[32];
  unsigned char *ptr_buffer;
  long int l_read;
  time_t starttime, endtime;
 
  time(&starttime);
  if ((file = fopen (filename, "rb")) == NULL) {
    /*printf ("%s can't be opened, try it as a string\n", filename);*/
    MDString((char *)filename, (char *)outbuf);
    for (i=0;i<32;i++) output[i] = outbuf[i];
    time(&endtime);
    /*printf("The process takes %u seconds\n",(long) (endtime-starttime));*/
  }
  else {
    MDInit (&context);
    if (LONG != 0 )
      l_read = LONG;
    else
      l_read = 1024;

    while (len = fread (buffer, 1, l_read, file)) {
      nb_car_x=0;
      if (LONG != 0 && (len+2) < sizeof(buffer) ) {
        buffer[len]  ='\15';
        buffer[len+1]='\12';
        buffer[len+2]='\0';
        len+=2;
      }

      if (UNE_LIGNE == '1'){
        ind2=0;
        nb_car_x=0;
        for (ind1=0; ind1 < len; ind1++ ) {
          if ( buffer[ind1] != '\15' && buffer[ind1] != '\12' ) {
            buffer2[ind2++] = buffer[ind1];
          } else {
            nb_car_x++;
          }
        }
        ptr_buffer = buffer2;
      } else
        ptr_buffer = buffer;
      MDUpdate (&context, ptr_buffer, len-nb_car_x);
    }
    MDFinal (digest, &context);

    fclose (file);
    time(&endtime);
    /*printf ("MD%d (\"%s\") = ", MD, filename);*/
    MDPrint (digest, output);
    /*printf("The process takes %u seconds\n",(long) (endtime-starttime));*/
  }
}

/* Prints a message digest in hexadecimal. */
static void MDPrint (unsigned char digest[16], char *output)
{
  unsigned int i;
  
  for (i = 0; i < 16; i++) {
    /*printf ("%02x", digest[i]);*/
    sprintf(output+2*i, "%02x",digest[i]);
}
  /*printf("\n");
 printf("%s\n", output);
 printf("\n");*/
}

void mexFunction( int nlhs, mxArray *plhs[],
                  int nrhs, const mxArray *prhs[])
{
    char *input_buf, *output;
    int   buflen,status;
    
    output = (char *)mxCalloc(33, sizeof(char));
    
    /* check for proper number of arguments */
    if(nrhs!=1) 
      mexErrMsgTxt("One input required.");
    else if(nlhs > 1) 
      mexErrMsgTxt("Too many output arguments.");

    /* input must be a string */
    if ( mxIsChar(prhs[0]) != 1)
      mexErrMsgTxt("Input must be a string.");

     /* get the length of the input string */
    buflen = (mxGetM(prhs[0]) * mxGetN(prhs[0])) + 1;

    /* allocate memory for input and output strings */
    input_buf=(char *)mxCalloc(buflen, sizeof(char));
    
    /* copy the name from command line to input_buf */
      status = mxGetString(prhs[0], input_buf, buflen);
    if(status != 0) 
      mexWarnMsgTxt("Not enough space. String is truncated.");
    
    /* call the C subroutine */
   mMDFile(input_buf, output);
   output[32] = (char)0;
   plhs[0] = mxCreateString(output);
   mxFree(output);
   
    /* set C-style string output_buf to MATLAB mexFunction output*/
    return;
}