Newbie DSS theory problem.

Hey guys im very new to cryptogrophy and I have been writing a small java program to create a digital signature for a given 'txt' document using a private assymetric key. I have also created another small program to verify the signed document. Both programs are using DSS and I have performed all the calculations using BigIntegers.
My problem is that my DSS.verification program isn't producing the correct 'v' result and I am at a loss as to why!
Things I have checked:
1) Both programs produce the same hashed value (using SHA-1) for the message so I am assuming that the message is exactly the same.
2) I have double checked that the both the private and public key's have been read correctly.
3) I have double checked that the DSS.verification program is reading the signature exactly as it was produced.
4) I have verified that all the outputs (files) of the program are exactly as they had been generated.
So unless I have missed something out this leaves me to think that my formula is not being processed correctly. I am not 100% sure whether I have ported the DSS formula properly into java, can anyone point out any problems in my formula? Particularly s and v because I have to do some manipulation to get the formula to work using BigIntegers.
All values are BigIntegers and 'hashedValue' is the digested message (SHA-1) converted to a BigInteger
DSS.Sign
r = ( g.modPow(k, p) ).mod(q);
s = ( ( k.modPow(NEGATIVE_ONE, q) ).multiply(hashedValue) ).mod(q);
s = s.add( x.multiply(r) );
s = s.mod(q); DSS.Verify
w = s.modPow(NEGATIVE_ONE, q);
a = (hashedValue.multiply(w)).mod(q);
b = ( ( r.multiply(w) ).mod(q) );
v = ( g.modPow(a, p) ).multiply( y.modPow(b, p) );
v = v.mod(p);
v = v.mod(q);Here is a sample of my output which may give some clues as to how close (or not) I am??
r=424312638947657700251206397299565288614405959700
s=481960089187838014555717597653069349705621725432
Verifying signature...
r=424312638947657700251206397299565288614405959700
v=364193452644066677310533663835034943549826723794
Thanks a lot for any help you can give!!
Shanon :)

Ahhh...
Thats a good point, I didn't mention it in the above post but when I mentioned that both programs were producing the same hashed value. They are actually being compared as integers and I haven't noticed them being negative but I will have another look.
Another thing I forgot to mention was that I have also verified that 0 < r < q and 0 < s < q.
I've had a quick search around the net and the forums but I cant find any examples of a DSS formula being used in java. I'd love to be able to have a look at someones formula to compare it.
Have you seen any such examples in your travels?
Shanon :)

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