337 lines
9.4 KiB
C
337 lines
9.4 KiB
C
/*
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* md4.c -- Implementation of MD4 Message Digest Algorithm
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* Updated: 2/16/90 by Ronald L. Rivest
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*
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* Portability nits fixed and reformatted - 2/12/91 Phil Karn
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*
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* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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* rights reserved.
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*
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* License to copy and use this software is granted provided that it
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* is identified as the "RSA Data Security, Inc. MD5 Message-Digest
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* Algorithm" in all material mentioning or referencing this software
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* or this function.
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*
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* License is also granted to make and use derivative works provided
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* that such works are identified as "derived from the RSA Data
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* Security, Inc. MD5 Message-Digest Algorithm" in all material
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* mentioning or referencing the derived work.
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*
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* RSA Data Security, Inc. makes no representations concerning either
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* the merchantability of this software or the suitability of this
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* software for any particular purpose. It is provided "as is"
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* without express or implied warranty of any kind.
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*
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* These notices must be retained in any copies of any part of this
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* documentation and/or software.
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*/
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/*
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* To use MD4:
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* -- Include md4.h in your program
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* -- Declare an MDstruct MD to hold the state of the digest computation.
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* -- Initialize MD using MDbegin(&MD)
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* -- For each full block (64 bytes) X you wish to process, call
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* MDupdate(&MD,X,512)
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* (512 is the number of bits in a full block.)
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* -- For the last block (less than 64 bytes) you wish to process,
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* MDupdate(&MD,X,n)
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* where n is the number of bits in the partial block. A partial
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* block terminates the computation, so every MD computation should
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* terminate by processing a partial block, even if it has n = 0.
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* -- The message digest is available in MD.buffer[0] ... MD.buffer[3].
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* (Least-significant byte of each word should be output first.)
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* -- You can print out the digest using MDprint(&MD)
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*/
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/* Implementation notes:
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* This implementation assumes that longs are 32-bit quantities.
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* If the machine stores the least-significant byte of an long in the
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* least-addressed byte (eg., VAX and 8086), then LOWBYTEFIRST should be
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* set to TRUE. Otherwise (eg., SUNS), LOWBYTEFIRST should be set to
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* FALSE. Note that on machines with LOWBYTEFIRST FALSE the routine
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* MDupdate modifies has a side-effect on its input array (the order of bytes
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* in each word are reversed). If this is undesired a call to MDreverse(X) can
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* reverse the bytes of X back into order after each call to MDupdate.
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*/
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#define TRUE 1
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#define FALSE 0
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#if (defined(__MSDOS__) || defined(MPU8086) || defined(MPU8080) \
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|| defined(vax) || defined (MIPSEL))
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#define LOWBYTEFIRST TRUE /* Low order bytes are first in memory */
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#else /* Almost all other machines are big-endian */
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#define LOWBYTEFIRST FALSE
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#endif
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/* Compile-time includes */
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#include <stdio.h>
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#include "md4.h"
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/* Compile-time declarations of MD4 ``magic constants'' */
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#define I0 0x67452301 /* Initial values for MD buffer */
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#define I1 0xefcdab89
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#define I2 0x98badcfe
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#define I3 0x10325476
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#define C2 013240474631 /* round 2 constant = sqrt(2) in octal */
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#define C3 015666365641 /* round 3 constant = sqrt(3) in octal */
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/* C2 and C3 are from Knuth, The Art of Programming, Volume 2
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* (Seminumerical Algorithms), Second Edition (1981), Addison-Wesley.
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* Table 2, page 660.
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*/
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#define fs1 3 /* round 1 shift amounts */
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#define fs2 7
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#define fs3 11
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#define fs4 19
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#define gs1 3 /* round 2 shift amounts */
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#define gs2 5
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#define gs3 9
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#define gs4 13
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#define hs1 3 /* round 3 shift amounts */
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#define hs2 9
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#define hs3 11
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#define hs4 15
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/* Compile-time macro declarations for MD4.
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* Note: The ``rot'' operator uses the variable ``tmp''.
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* It assumes tmp is declared as unsigned long, so that the >>
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* operator will shift in zeros rather than extending the sign bit.
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*/
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#define f(X,Y,Z) ((X&Y) | ((~X)&Z))
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#define g(X,Y,Z) ((X&Y) | (X&Z) | (Y&Z))
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#define h(X,Y,Z) (X^Y^Z)
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#define rot(X,S) (tmp=X,(tmp<<S) | (tmp>>(32-S)))
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#define ff(A,B,C,D,i,s) A = rot((A + f(B,C,D) + X[i]),s)
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#define gg(A,B,C,D,i,s) A = rot((A + g(B,C,D) + X[i] + C2),s)
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#define hh(A,B,C,D,i,s) A = rot((A + h(B,C,D) + X[i] + C3),s)
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void MDreverse __ARGS((unsigned long *X));
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/* MDprint(MDp)
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* Print message digest buffer MDp as 32 hexadecimal digits.
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* Order is from low-order byte of buffer[0] to high-order byte of buffer[3].
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* Each byte is printed with high-order hexadecimal digit first.
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* This is a user-callable routine.
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*/
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void
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MDprint(MDp)
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MDptr MDp;
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{
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int i,j;
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for(i=0;i<4;i++)
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for(j=0;j<32;j=j+8)
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printf("%02lx",(MDp->buffer[i]>>j) & 0xFF);
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}
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/* MDbegin(MDp)
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* Initialize message digest buffer MDp.
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* This is a user-callable routine.
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*/
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void
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MDbegin(MDp)
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MDptr MDp;
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{
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int i;
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MDp->buffer[0] = I0;
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MDp->buffer[1] = I1;
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MDp->buffer[2] = I2;
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MDp->buffer[3] = I3;
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for(i=0;i<8;i++)
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MDp->count[i] = 0;
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MDp->done = 0;
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}
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/* MDreverse(X)
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* Reverse the byte-ordering of every long in X.
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* Assumes X is an array of 16 longs.
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* The macro revx reverses the byte-ordering of the next word of X.
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*/
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#define revx { t = (*X << 16) | (*X >> 16); \
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*X++ = ((t & 0xFF00FF00) >> 8) | ((t & 0x00FF00FF) << 8); }
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void
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MDreverse(X)
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unsigned long *X;
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{
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register unsigned long t;
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revx;
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revx;
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revx;
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revx;
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revx;
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revx;
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revx;
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revx;
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revx;
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revx;
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revx;
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revx;
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revx;
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revx;
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revx;
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revx;
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}
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/* MDblock(MDp,X)
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* Update message digest buffer MDp->buffer using 16-word data block X.
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* Assumes all 16 words of X are full of data.
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* Does not update MDp->count.
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* This routine is not user-callable.
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*/
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static void
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MDblock(MDp,X)
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MDptr MDp;
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unsigned long *X;
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{
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register unsigned long tmp, A, B, C, D;
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#if LOWBYTEFIRST == FALSE
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MDreverse(X);
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#endif
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A = MDp->buffer[0];
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B = MDp->buffer[1];
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C = MDp->buffer[2];
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D = MDp->buffer[3];
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/* Update the message digest buffer */
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ff(A,B,C,D,0,fs1); /* Round 1 */
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ff(D,A,B,C,1,fs2);
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ff(C,D,A,B,2,fs3);
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ff(B,C,D,A,3,fs4);
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ff(A,B,C,D,4,fs1);
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ff(D,A,B,C,5,fs2);
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ff(C,D,A,B,6,fs3);
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ff(B,C,D,A,7,fs4);
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ff(A,B,C,D,8,fs1);
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ff(D,A,B,C,9,fs2);
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ff(C,D,A,B,10,fs3);
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ff(B,C,D,A,11,fs4);
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ff(A,B,C,D,12,fs1);
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ff(D,A,B,C,13,fs2);
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ff(C,D,A,B,14,fs3);
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ff(B,C,D,A,15,fs4);
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gg(A,B,C,D,0,gs1); /* Round 2 */
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gg(D,A,B,C,4,gs2);
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gg(C,D,A,B,8,gs3);
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gg(B,C,D,A,12,gs4);
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gg(A,B,C,D,1,gs1);
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gg(D,A,B,C,5,gs2);
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gg(C,D,A,B,9,gs3);
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gg(B,C,D,A,13,gs4);
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gg(A,B,C,D,2,gs1);
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gg(D,A,B,C,6,gs2);
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gg(C,D,A,B,10,gs3);
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gg(B,C,D,A,14,gs4);
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gg(A,B,C,D,3,gs1);
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gg(D,A,B,C,7,gs2);
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gg(C,D,A,B,11,gs3);
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gg(B,C,D,A,15,gs4);
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hh(A,B,C,D,0,hs1); /* Round 3 */
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hh(D,A,B,C,8,hs2);
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hh(C,D,A,B,4,hs3);
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hh(B,C,D,A,12,hs4);
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hh(A,B,C,D,2,hs1);
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hh(D,A,B,C,10,hs2);
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hh(C,D,A,B,6,hs3);
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hh(B,C,D,A,14,hs4);
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hh(A,B,C,D,1,hs1);
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hh(D,A,B,C,9,hs2);
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hh(C,D,A,B,5,hs3);
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hh(B,C,D,A,13,hs4);
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hh(A,B,C,D,3,hs1);
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hh(D,A,B,C,11,hs2);
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hh(C,D,A,B,7,hs3);
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hh(B,C,D,A,15,hs4);
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MDp->buffer[0] += A;
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MDp->buffer[1] += B;
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MDp->buffer[2] += C;
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MDp->buffer[3] += D;
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}
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/* MDupdate(MDp,X,count)
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* Input: MDp -- an MDptr
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* X -- a pointer to an array of unsigned characters.
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* count -- the number of bits of X to use.
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* (if not a multiple of 8, uses high bits of last byte.)
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* Update MDp using the number of bits of X given by count.
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* This is the basic input routine for an MD4 user.
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* The routine completes the MD computation when count < 512, so
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* every MD computation should end with one call to MDupdate with a
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* count less than 512. A call with count 0 will be ignored if the
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* MD has already been terminated (done != 0), so an extra call with count
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* 0 can be given as a ``courtesy close'' to force termination if desired.
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*/
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void
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MDupdate(MDp,X,count)
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MDptr MDp;
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unsigned char *X;
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unsigned int count;
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{
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int i,bit,byte,mask;
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unsigned long tmp;
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unsigned char XX[64];
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unsigned char *p;
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/* return with no error if this is a courtesy close with count
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* zero and MDp->done is true.
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*/
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if(count == 0 && MDp->done)
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return;
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/* check to see if MD is already done and report error */
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if(MDp->done){
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printf("\nError: MDupdate MD already done.");
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return;
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}
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/* Add count to MDp->count */
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tmp = count;
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p = MDp->count;
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while(tmp){
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tmp += *p;
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*p++ = tmp;
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tmp = tmp >> 8;
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}
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/* Process data */
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if(count == 512){
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/* Full block of data to handle */
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MDblock(MDp,(unsigned long *)X);
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} else if(count > 512){
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/* Check for count too large */
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printf("\nError: MDupdate called with illegal count value %ld.",count);
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return;
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} else {
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/* partial block -- must be last block so finish up
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* Find out how many bytes and residual bits there are
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*/
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byte = count >> 3;
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bit = count & 7;
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/* Copy X into XX since we need to modify it */
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for(i=0;i<=byte;i++)
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XX[i] = X[i];
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for(i=byte+1;i<64;i++)
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XX[i] = 0;
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/* Add padding '1' bit and low-order zeros in last byte */
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mask = 1 << (7 - bit);
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XX[byte] = (XX[byte] | mask) & ~( mask - 1);
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/* If room for bit count, finish up with this block */
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if(byte <= 55){
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for(i=0;i<8;i++)
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XX[56+i] = MDp->count[i];
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MDblock(MDp,(unsigned long *)XX);
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} else {
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/* need to do two blocks to finish up */
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MDblock(MDp,(unsigned long *)XX);
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for(i=0;i<56;i++)
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XX[i] = 0;
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for(i=0;i<8;i++)
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XX[56+i] = MDp->count[i];
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MDblock(MDp,(unsigned long *)XX);
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}
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/* Set flag saying we're done with MD computation */
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MDp->done = 1;
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}
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}
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/* End of md4.c */
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