Error :)

gistfile1.txt

package codes.matthewp.todofx.data.security;

import com.google.crypto.tink.*;
import com.google.crypto.tink.aead.AeadConfig;
import com.google.crypto.tink.aead.AeadKeyTemplates;
import com.google.crypto.tink.config.TinkConfig;
import com.google.crypto.tink.proto.KeyTemplate;

import java.io.File;
import java.io.IOException;
import java.security.GeneralSecurityException;

/**
 * Note: Major security flaw. If someone is able to access the computer running the server, they can read the keyset easily. To combat this, add a key from some KMS place.
 * https://github.com/google/tink/blob/master/docs/JAVA-HOWTO.md#storing-keysets
 */
public class EncryptCore {

    private File keySetFile;

    private KeysetHandle keysetHandle;

    public EncryptCore() throws GeneralSecurityException, IOException {
        AeadConfig.register();
        keySetFile = new File("keyset.json");
        if (keySetFile.exists()) {
            keysetHandle = CleartextKeysetHandle.read(
                    JsonKeysetReader.withFile(keySetFile));
        } else {
            KeyTemplate keyTemplate = AeadKeyTemplates.AES128_GCM;
            keysetHandle = KeysetHandle.generateNew(keyTemplate);
            CleartextKeysetHandle.write(keysetHandle, JsonKeysetWriter.withFile(
                    keySetFile));
        }

    }

    public String encrypt(String string) {
        // 2. Get the primitive, error getPrimitive does not exist. Maybe ask? 
        Aead aead = keysetHandle.getPrimitive(Aead.class);
        
        // 3. Use the primitive to encrypt a plaintext,
        byte[] ciphertext = aead.encrypt(plaintext, aad);

        // ... or to decrypt a ciphertext.
        byte[] decrypted = aead.decrypt(ciphertext, aad);
        return  "";
    }
}