// 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);
}
/**
* Constructs a new Checksum by calculating the checksum over the data using specified checksum
* type.
*
* @new_cksumType the type of checksum.
* @data the data that needs to be performed a checksum calculation on.
*/
public Checksum(int new_cksumType, byte[] data) throws KdcErrException, KrbCryptoException {
cksumType = new_cksumType;
CksumType cksumEngine = CksumType.getInstance(cksumType);
if (!cksumEngine.isSafe()) {
checksum = cksumEngine.calculateChecksum(data, data.length);
} else {
throw new KdcErrException(Krb5.KRB_AP_ERR_INAPP_CKSUM);
}
}
boolean isEqual(Checksum cksum) throws KdcErrException {
if (cksumType != cksum.cksumType) return false;
CksumType cksumEngine = CksumType.getInstance(cksumType);
return CksumType.isChecksumEqual(checksum, cksum.checksum);
}
/** 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);
}