private void constrain() {
BigInteger offset = new BigInteger(Integer.toString(addressSize * (numUsableRows)));
BigInteger endVal = startVal.add(offset);
if (endVal.compareTo(scrollBar.getMaximumHP()) > 0) {
startVal = scrollBar.getMaximumHP().subtract(offset);
endVal = scrollBar.getMaximumHP();
scrollBar.setValueHP(startVal);
model.fireTableDataChanged();
}
}
private void updateFromScrollBar() {
beginUpdate();
BigInteger oldStartVal = startVal;
startVal = scrollBar.getValueHP();
constrain();
model.fireTableDataChanged();
if (oldStartVal != null) {
modifySelection(oldStartVal.subtract(startVal).intValue() / addressSize);
}
endUpdate();
}
private void exchangeKeys() {
try {
output.write(modulus.toByteArray());
byte[] buffer = new byte[ciphertextBlockSize];
input.read(buffer);
recipModulus = new BigInteger(1, buffer);
} catch (IOException ioe) {
System.err.println("Error establishing keys");
}
}
private String bigIntToHexString(BigInteger bi) {
StringBuffer buf = new StringBuffer();
buf.append("0x");
String val = bi.toString(16);
for (int i = 0; i < ((2 * addressSize) - val.length()); i++) {
buf.append('0');
}
buf.append(val);
return buf.toString();
}
private void makeKeys() {
PrimeGenerator pg = new PrimeGenerator(513, 10, sr);
do {
p = pg.getStrongPrime();
} while (p.subtract(BigIntegerMath.ONE).mod(BigIntegerMath.THREE).equals(BigIntegerMath.ZERO));
do {
q = pg.getStrongPrime();
} while (q.subtract(BigIntegerMath.ONE).mod(BigIntegerMath.THREE).equals(BigIntegerMath.ZERO));
modulus = p.multiply(q);
// Use 3 as enciphering exponent - OK since we are using salt
decipherExp =
BigIntegerMath.THREE.modInverse(
p.subtract(BigIntegerMath.ONE).multiply(q.subtract(BigIntegerMath.ONE)));
ciphertextBlockSize = (modulus.bitLength() - 1) / 8 + 1;
// Maximum size of plaintext is 6 bytes less than ciphertext
// 1 to get under modulus
// 4 for the salt
// 1 for a pad byte
plaintextBlockSize = ciphertextBlockSize - 6;
}