** computation.
** -- Initialize MD using MDbegin(&MD)
** -- For each full block (64 bytes) X you wish to process, call
-** MDupdate(&MD,X,512)
+** 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,
-** MDupdate(&MD,X,n)
+** 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
/* 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 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)
+/* 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].
** 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);
+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);
}
-/* MDbegin(MDp)
+/* MD4Init(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;
+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)
** This routine is not user-callable.
*/
static void
-MDblock(MDp,X)
-MDptr MDp;
-unsigned int *X;
+MDblock(MDp,Xb)
+MD4_CTX *MDp;
+unsigned char *Xb;
{
-register unsigned int tmp, A, B, C, D;
-static int low_byte_first = -1;
+ register unsigned int tmp, A, B, C, D;
+ unsigned int X[16];
+ int i;
-if (low_byte_first == -1) {
- low_byte_first = (htons((unsigned short int)1) != 1);
-}
-
-if (low_byte_first == 0) {
- MDreverse(X);
-}
+ 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);
-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;
+ 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.
+/* MD4Update(MDp,X,count)
+** Input: 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
+** every MD computation should end with one call to MD4Update 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;
+MD4Update(MDp,X,count)
+MD4_CTX *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.
+{
+ 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: MD4Update 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,X);
+ }
+ else if (count > 512) /* Check for count too large */
+ {
+ printf("\nError: MD4Update 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,XX);
+ }
+ else /* need to do two blocks to finish up */
+ {
+ MDblock(MDp,XX);
+ for (i=0;i<56;i++) XX[i] = 0;
+ for (i=0;i<8;i++) XX[56+i] = MDp->count[i];
+ MDblock(MDp,XX);
+ }
+ /* Set flag saying we're done with MD computation */
+ MDp->done = 1;
+ }
+}
+
+/*
+** Finish up MD4 computation and return message digest.
*/
-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;
- }
+void
+MD4Final(buf, MD)
+unsigned char *buf;
+MD4_CTX *MD;
+{
+ int i, j;
+ unsigned int w;
+
+ MD4Update(MD, NULL, 0);
+ for (i = 0; i < 4; ++i) {
+ w = MD->buffer[i];
+ for (j = 0; j < 4; ++j) {
+ *buf++ = w;
+ w >>= 8;
+ }
+ }
}
/*
projects / ppp.git / commitdiff