/**
* initialise a RC5-64 cipher.
*
* @param forEncryption whether or not we are for encryption.
* @param params the parameters required to set up the cipher.
* @exception IllegalArgumentException if the params argument is inappropriate.
*/
public void init(boolean forEncryption, CipherParameters params) {
if (!(params instanceof RC5Parameters)) {
throw new IllegalArgumentException(
"invalid parameter passed to RC564 init - " + params.getClass().getName());
}
RC5Parameters p = (RC5Parameters) params;
this.forEncryption = forEncryption;
_noRounds = p.getRounds();
setKey(p.getKey());
}
/**
* initialise a RC4 cipher.
*
* @param forEncryption whether or not we are for encryption.
* @param params the parameters required to set up the cipher.
* @exception IllegalArgumentException if the params argument is inappropriate.
*/
public void init(boolean forEncryption, CipherParameters params) {
if (params instanceof KeyParameter) {
/*
* RC4 encryption and decryption is completely
* symmetrical, so the 'forEncryption' is
* irrelevant.
*/
workingKey = ((KeyParameter) params).getKey();
setKey(workingKey);
return;
}
throw new IllegalArgumentException(
"invalid parameter passed to RC4 init - " + params.getClass().getName());
}