/**
* encrypt exactly 16 bytes using the session key
*
* @param payload plaintext data, 16 bytes starting at inIndex
* @param sessionKey private session key
* @param out out parameter, 16 bytes starting at outIndex
*/
@Override
public final void encryptBlock(
byte payload[], int inIndex, SessionKey sessionKey, byte out[], int outIndex) {
if (sessionKey.getPreparedKey() == null) {
try {
Object key = CryptixRijndael_Algorithm.makeKey(sessionKey.getData(), 16);
sessionKey.setPreparedKey(key);
} catch (InvalidKeyException ike) {
_log.log(Log.CRIT, "Invalid key", ike);
throw new IllegalArgumentException("wtf, invalid key? " + ike.getMessage());
}
}
CryptixRijndael_Algorithm.blockEncrypt(
payload, out, inIndex, outIndex, sessionKey.getPreparedKey());
}
/**
* decrypt exactly 16 bytes of data with the session key provided
*
* @param payload encrypted data, 16 bytes starting at inIndex
* @param sessionKey private session key
* @param rv out parameter, 16 bytes starting at outIndex
*/
@Override
public final void decryptBlock(
byte payload[], int inIndex, SessionKey sessionKey, byte rv[], int outIndex) {
// just let it throw NPE or IAE later for speed, you'll figure it out
// if ( (payload == null) || (rv == null) )
// throw new IllegalArgumentException("null block args");
// if (payload.length - inIndex > rv.length - outIndex)
// throw new IllegalArgumentException("bad block args [payload.len=" + payload.length
// + " inIndex=" + inIndex + " rv.len=" + rv.length
// + " outIndex="+outIndex);
if (sessionKey.getPreparedKey() == null) {
try {
Object key = CryptixRijndael_Algorithm.makeKey(sessionKey.getData(), 16);
sessionKey.setPreparedKey(key);
} catch (InvalidKeyException ike) {
_log.log(Log.CRIT, "Invalid key", ike);
throw new IllegalArgumentException("wtf, invalid key? " + ike.getMessage());
}
}
CryptixRijndael_Algorithm.blockDecrypt(
payload, rv, inIndex, outIndex, sessionKey.getPreparedKey());
}
