Implementing SHA-1 in Java?!?

[mshita]

Hi all,

I'm trying to implement the SHA-1 algorithm in Java 2, Micro Edition but are having major problems getting it to work.

The first part with message padding works great. The problem is in the hashing routine. I got the following code:

On section d of the FIPS PUB 180-1 they say:

(D) For t=0 to 79 do
TEMP = S^5(A) + f(B,C,D) + E + Wt + Kt
E = D; D = C; C = S^30(B); B = A; A = TEMP;

I've implemented this using the following code:

for (count = 0; count < 80; count++) {
   Wtemp = S(A, 5) + F(count, B, C, D) + E + W[count] + K(count);
   E = D; D = C; C = S(B, 30); B = A; A = Wtemp;
} 

For the function S I have:

int S(int WORD, int BITS){
   return (((WORD) << (BITS)) | ((WORD) >> (32-(BITS)))); 

For the function F I have:

int F(int pos, int B, int C, int D) {
   if (pos < 20) 
      tempByte = (B & C) | ((~B) & D);
   else if (pos < 40)
      tempByte = B ^ C ^ D;
   else if (pos < 60)
      tempByte = (B & C) | (B & D) | (C & D);
   else
      tempByte = B ^ C ^ d;

   return tempByte;
} 

Using the test vector showed on the FIPS PUB 180-1 (Message = "abc") I get the first 2 rounds correct but the remaining 78 rounds are completely out of whack.

Anyone have any ideas????????????

Mounir