+++ /dev/null
-/*
-** ********************************************************************
-** 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
-** MDupdate(&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,
-** MDupdate(&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.
-** If the machine stores the least-significant byte of an int in the
-** least-addressed byte (e.g., VAX and 8086), then LOWBYTEFIRST
-** should be set to TRUE. Otherwise (e.g., SUNS), LOWBYTEFIRST
-** should be set to FALSE. Note that on machines with LOWBYTEFIRST
-** FALSE the routine MDupdate modifies has a side-effect on its input
-** array (the order of bytes in each word are reversed). If this is
-** undesired a call to MDreverse(X) can reverse the bytes of X back
-** into order after each call to MDupdate.
-**
-** NOTE: LOWBYTEFIRST removed by Eric Rosenquist in favour of run-time
-** detection to simplify build process.
-*/
-
-#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)
-
-/* MDprint(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
-MDprint(MDp)
-MDptr 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);
-}
-
-/* MDbegin(MDp)
-** Initialize message digest buffer MDp.
-** This is a user-callable routine.
-*/
-void
-MDbegin(MDp)
-MDptr 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;
-}
-
-/* MDreverse(X)
-** Reverse the byte-ordering of every int in X.
-** Assumes X is an array of 16 ints.
-** The macro revx reverses the byte-ordering of the next word of X.
-*/
-#define revx { t = (*X << 16) | (*X >> 16); \
- *X++ = ((t & 0xFF00FF00) >> 8) | ((t & 0x00FF00FF) << 8); }
-MDreverse(X)
-unsigned int *X;
-{ register unsigned int t;
-revx; revx; revx; revx; revx; revx; revx; revx;
-revx; revx; revx; revx; revx; revx; revx; revx;
-}
-
-/* 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,X)
-MDptr MDp;
-unsigned int *X;
-{
-register unsigned int tmp, A, B, C, D;
-static int low_byte_first = -1;
-
-if (low_byte_first == -1) {
- low_byte_first = (htons((unsigned short int)1) != 1);
-}
-
-if (low_byte_first == 0) {
- MDreverse(X);
-}
-
-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);
-ff(C , D , A , B , 6 , fs3);
-ff(B , C , D , A , 7 , fs4);
-ff(A , B , C , D , 8 , fs1);
-ff(D , A , B , C , 9 , fs2);
-ff(C , D , A , B , 10 , fs3);
-ff(B , C , D , A , 11 , fs4);
-ff(A , B , C , D , 12 , fs1);
-ff(D , A , B , C , 13 , fs2);
-ff(C , D , A , B , 14 , fs3);
-ff(B , C , D , A , 15 , fs4);
-gg(A , B , C , D , 0 , gs1); /* Round 2 */
-gg(D , A , B , C , 4 , gs2);
-gg(C , D , A , B , 8 , gs3);
-gg(B , C , D , A , 12 , gs4);
-gg(A , B , C , D , 1 , gs1);
-gg(D , A , B , C , 5 , gs2);
-gg(C , D , A , B , 9 , gs3);
-gg(B , C , D , A , 13 , gs4);
-gg(A , B , C , D , 2 , gs1);
-gg(D , A , B , C , 6 , gs2);
-gg(C , D , A , B , 10 , gs3);
-gg(B , C , D , A , 14 , gs4);
-gg(A , B , C , D , 3 , gs1);
-gg(D , A , B , C , 7 , gs2);
-gg(C , D , A , B , 11 , gs3);
-gg(B , C , D , A , 15 , gs4);
-hh(A , B , C , D , 0 , hs1); /* Round 3 */
-hh(D , A , B , C , 8 , hs2);
-hh(C , D , A , B , 4 , hs3);
-hh(B , C , D , A , 12 , hs4);
-hh(A , B , C , D , 2 , hs1);
-hh(D , A , B , C , 10 , hs2);
-hh(C , D , A , B , 6 , hs3);
-hh(B , C , D , A , 14 , hs4);
-hh(A , B , C , D , 1 , hs1);
-hh(D , A , B , C , 9 , hs2);
-hh(C , D , A , B , 5 , hs3);
-hh(B , C , D , A , 13 , hs4);
-hh(A , B , C , D , 3 , hs1);
-hh(D , A , B , C , 11 , hs2);
-hh(C , D , A , B , 7 , hs3);
-hh(B , C , D , A , 15 , hs4);
-MDp->buffer[0] += A;
-MDp->buffer[1] += B;
-MDp->buffer[2] += C;
-MDp->buffer[3] += D;
-}
-
-/* MDupdate(MDp,X,count)
-** Input: MDp -- an MDptr
-** X -- a pointer to an array of unsigned characters.
-** count -- the number of bits of X to use.
-** (if not a multiple of 8, uses high bits of last byte.)
-** Update MDp using the number of bits of X given by count.
-** This is the basic input routine for an MD4 user.
-** The routine completes the MD computation when count < 512, so
-** every MD computation should end with one call to MDupdate with a
-** count less than 512. A call with count 0 will be ignored if the
-** MD has already been terminated (done != 0), so an extra call with
-** count 0 can be given as a "courtesy close" to force termination
-** if desired.
-*/
-void
-MDupdate(MDp,X,count)
-MDptr MDp;
-unsigned char *X;
-unsigned int count;
-{ unsigned int i, tmp, bit, byte, mask;
-unsigned char XX[64];
-unsigned char *p;
-/* return with no error if this is a courtesy close with count
-** zero and MDp->done is true.
-*/
-if (count == 0 && MDp->done) return;
-/* check to see if MD is already done and report error */
-if (MDp->done)
- { printf("\nError: MDupdate MD already done."); return; }
-/* Add count to MDp->count */
-tmp = count;
-p = MDp->count;
-while (tmp)
- { tmp += *p;
- *p++ = tmp;
- tmp = tmp >> 8;
- }
-/* Process data */
-if (count == 512)
- { /* Full block of data to handle */
- MDblock(MDp,(unsigned int *)X);
- }
-else if (count > 512) /* Check for count too large */
- { printf("\nError: MDupdate called with illegal count value %d."
- ,count);
- return;
- }
-else /* partial block -- must be last block so finish up */
- { /* Find out how many bytes and residual bits there are */
- byte = count >> 3;
- bit = count & 7;
- /* Copy X into XX since we need to modify it */
- for (i=0;i<=byte;i++) XX[i] = X[i];
- for (i=byte+1;i<64;i++) XX[i] = 0;
- /* Add padding '1' bit and low-order zeros in last byte */
- mask = 1 << (7 - bit);
- XX[byte] = (XX[byte] | mask) & ~( mask - 1);
- /* If room for bit count, finish up with this block */
- if (byte <= 55)
- { for (i=0;i<8;i++) XX[56+i] = MDp->count[i];
- MDblock(MDp,(unsigned int *)XX);
- }
- else /* need to do two blocks to finish up */
- { MDblock(MDp,(unsigned int *)XX);
- for (i=0;i<56;i++) XX[i] = 0;
- for (i=0;i<8;i++) XX[56+i] = MDp->count[i];
- MDblock(MDp,(unsigned int *)XX);
- }
- /* Set flag saying we're done with MD computation */
- MDp->done = 1;
- }
-}
-
-/*
-** End of md4.c
-****************************(cut)***********************************/
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