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package org.spongycastle.crypto.generators;
import org.spongycastle.crypto.CipherKeyGenerator;
import org.spongycastle.crypto.KeyGenerationParameters;
import org.spongycastle.crypto.params.DESParameters;
public class DESKeyGenerator
extends CipherKeyGenerator
{
/**
* initialise the key generator - if strength is set to zero
* the key generated will be 64 bits in size, otherwise
* strength can be 64 or 56 bits (if you don't count the parity bits).
*
* @param param the parameters to be used for key generation
*/
public void init(
KeyGenerationParameters param)
{
super.init(param);
if (strength == 0 || strength == (56 / 8))
{
strength = DESParameters.DES_KEY_LENGTH;
}
else if (strength != DESParameters.DES_KEY_LENGTH)
{
throw new IllegalArgumentException("DES key must be "
+ (DESParameters.DES_KEY_LENGTH * 8)
+ " bits long.");
}
}
public byte[] generateKey()
{
byte[] newKey = new byte[DESParameters.DES_KEY_LENGTH];
do
{
random.nextBytes(newKey);
DESParameters.setOddParity(newKey);
}
while (DESParameters.isWeakKey(newKey, 0));
return newKey;
}
}
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