Remove leading zeros when hashing session keys

Currently hashing of session key doesn't remove leading zeros from S. This creates mis-match with other platform.

Change -

public BigInteger getSessionKey(final boolean doHash) {

        if (S == null)
            return null;

        if (doHash) {
            return new BigInteger(config.getMessageDigestInstance().digest(S.toByteArray()));
        }
        else {
            return S;
        }
    }

to

public BigInteger getSessionKey(final boolean doHash) {

        if (S == null)
            return null;

        if (doHash) {
            return new BigInteger(config.getMessageDigestInstance().digest(bigIntegerToUnsignedByteArray(S)));
        }
        else {
            return S;
        }
    }

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