mdk-stage1/ppp/pppstats

/*
** ********************************************************************
** md4.c -- Implementation of MD4 Message Digest Algorithm           **
** Updated: 2/16/90 by Ronald L. Rivest                              **
** (C) 1990 RSA Data Security, Inc.                                  **
** ********************************************************************
*/

/*
** To use MD4:
**   -- Include md4.h in your program
**   -- Declare an MDstruct MD to hold the state of the digest
**          computation.
**   -- Initialize MD using MDbegin(&MD)
**   -- For each full block (64 bytes) X you wish to process, call
**          MD4Update(&MD,X,512)
**      (512 is the number of bits in a full block.)
**   -- For the last block (less than 64 bytes) you wish to process,
**          MD4Update(&MD,X,n)
**      where n is the number of bits in the partial block. A partial
**      block terminates the computation, so every MD computation
**      should terminate by processing a partial block, even if it
**      has n = 0.
**   -- The message digest is available in MD.buffer[0] ...
**      MD.buffer[3].  (Least-significant byte of each word
**      should be output first.)
**   -- You can print out the digest using MDprint(&MD)
*/

/* Implementation notes:
** This implementation assumes that ints are 32-bit quantities.
*/

#define TRUE  1
#define FALSE 0

/* Compile-time includes
*/
#include <stdio.h>
#include "md4.h"
#include "pppd.h"

/* Compile-time declarations of MD4 "magic constants".
*/
#define I0  0x67452301       /* Initial values for MD buffer */
#define I1  0xefcdab89
#define I2  0x98badcfe
#define I3  0x10325476
#define C2  013240474631     /* round 2 constant = sqrt(2) in octal */
#define C3  015666365641     /* round 3 constant = sqrt(3) in octal */
/* C2 and C3 are from Knuth, The Art of Programming, Volume 2
** (Seminumerical Algorithms), Second Edition (1981), Addison-Wesley.
** Table 2, page 660.
*/

#define fs1  3               /* round 1 shift amounts */
#define fs2  7
#define fs3 11
#define fs4 19
#define gs1  3               /* round 2 shift amounts */
#define gs2  5
#define gs3  9
#define gs4 13
#define hs1  3               /* round 3 shift amounts */
#define hs2  9
#define hs3 11
#define hs4 15

/* Compile-time macro declarations for MD4.
** Note: The "rot" operator uses the variable "tmp".
** It assumes tmp is declared as unsigned int, so that the >>
** operator will shift in zeros rather than extending the sign bit.
*/
#define f(X,Y,Z)             ((X&Y) | ((~X)&Z))
#define g(X,Y,Z)             ((X&Y) | (X&Z) | (Y&Z))
#define h(X,Y,Z)             (X^Y^Z)
#define rot(X,S)             (tmp=X,(tmp<<S) | (tmp>>(32-S)))
#define ff(A,B,C,D,i,s)      A = rot((A + f(B,C,D) + X[i]),s)
#define gg(A,B,C,D,i,s)      A = rot((A + g(B,C,D) + X[i] + C2),s)
#define hh(A,B,C,D,i,s)      A = rot((A + h(B,C,D) + X[i] + C3),s)

/* MD4print(MDp)
** Print message digest buffer MDp as 32 hexadecimal digits.
** Order is from low-order byte of buffer[0] to high-order byte of
** buffer[3].
** Each byte is printed with high-order hexadecimal digit first.
** This is a user-callable routine.
*/
void
MD4Print(MDp)
MD4_CTX *MDp;
{
  int i,j;
  for (i=0;i<4;i++)
    for (j=0;j<32;j=j+8)
      printf("%02x",(MDp->buffer[i]>>j) & 0xFF);
}

/* MD4Init(MDp)
** Initialize message digest buffer MDp.
** This is a user-callable routine.
*/
void
MD4Init(MDp)
MD4_CTX *MDp;
{
  int i;
  MDp->buffer[0] = I0;
  MDp->buffer[1] = I1;
  MDp->buffer[2] = I2;
  MDp->buffer[3] = I3;
  for (i=0;i<8;i++) MDp->count[i] = 0;
  MDp->done = 0;
}

/* MDblock(MDp,X)
** Update message digest buffer MDp->buffer using 16-word data block X.
** Assumes all 16 words of X are full of data.
** Does not update MDp->count.
** This routine is not user-callable.
*/
static void
MDblock(MDp,Xb)
MD4_CTX *MDp;
unsigned char *Xb;
{
  register unsigned int tmp, A, B, C, D;
  unsigned int X[16];
  int i;

  for (i = 0; i < 16; ++i) {
    X[i] = Xb[0] + (Xb[1] << 8) + (Xb[2] << 16) + (Xb[3] << 24);
    Xb += 4;
  }

  A = MDp->buffer[0];
  B = MDp->buffer[1];
  C = MDp->buffer[2];
  D = MDp->buffer[3];
  /* Update the message digest buffer */
  ff(A , B , C , D ,  0 , fs1); /* Round 1 */
  ff(D , A , B , C ,  1 , fs2);
  ff(C , D , A , B ,  2 , fs3);
  ff(B , C , D , A ,  3 , fs4);
  ff(A , B , C , D ,  4 , fs1);
  ff(D , A , B , C ,  5 , fs2);
Mode	Name	Size
-rw-r--r--	Makefile.linux	559	log stats plain
-rw-r--r--	Makefile.sol2	329	log stats plain
-rw-r--r--	Makefile.sunos4	536	log stats plain
-rw-r--r--	pppstats.8	5449	log stats plain
-rw-r--r--	pppstats.c	12880	log stats plain