// KrbSafe, KrbTgsReq
public Checksum(int new_cksumType, byte[] data, EncryptionKey key, int usage)
throws KdcErrException, KrbApErrException, KrbCryptoException {
cksumType = new_cksumType;
CksumType cksumEngine = CksumType.getInstance(cksumType);
if (!cksumEngine.isSafe()) throw new KrbApErrException(Krb5.KRB_AP_ERR_INAPP_CKSUM);
checksum = cksumEngine.calculateKeyedChecksum(data, data.length, key.getBytes(), usage);
}
/** Verifies the keyed checksum over the data passed in. */
public boolean verifyKeyedChecksum(byte[] data, EncryptionKey key, int usage)
throws KdcErrException, KrbApErrException, KrbCryptoException {
CksumType cksumEngine = CksumType.getInstance(cksumType);
if (!cksumEngine.isSafe()) throw new KrbApErrException(Krb5.KRB_AP_ERR_INAPP_CKSUM);
return cksumEngine.verifyKeyedChecksum(data, data.length, key.getBytes(), checksum, usage);
}