TinkPositive.java

package io.hf.samples.tink.positive;

import com.google.crypto.tink.Aead;
import com.google.crypto.tink.KeysetHandle;
import com.google.crypto.tink.aead.AeadConfig;
import com.google.crypto.tink.aead.AeadFactory;
import com.google.crypto.tink.aead.AeadKeyTemplates;

import java.nio.charset.StandardCharsets;
import java.util.Base64;

public class TinkPositive {

    // Based on: https://github.com/google/tink/blob/1.2/docs/JAVA-HOWTO.md
    // using 'com.google.crypto.tink:tink:1.2.2'
    public final static void main(String[] args) throws Exception {

        // 1. Use only AEAD primitive
        // AEAD: Authenticated Encryption with Associated Data
        AeadConfig.register();

        // 2. Generate the key material
        KeysetHandle keysetHandle = KeysetHandle.generateNew(AeadKeyTemplates.AES256_GCM);

        // 3. Get the primitive.
        Aead aead = AeadFactory.getPrimitive(keysetHandle);

        String plainText = "Tink Positive!";
        System.out.println("PlainText: " + plainText);

        // 4. Use the primitive to encrypt a plaintext.
        byte[] cipherText = aead.encrypt(plainText.getBytes(StandardCharsets.UTF_8), null);

        String base64 = new String(Base64.getEncoder().encode(cipherText), StandardCharsets.UTF_8);
        System.out.println("Encrypted: " + base64);

        // 5. decrypt a ciphertext.
        byte[] decrypted = aead.decrypt(cipherText, null);

        String decryptedText = new String(decrypted, StandardCharsets.UTF_8);
        System.out.println("Decrypted: " + decryptedText);
    }
}