Message Encryption for Web Push

This Tink app is an implementation of RFC 8291 - Message Encryption for Web Push.

The most recent release is 1.6.1, released 2021-07-12. API docs can be found here.

Installation

To add a dependency using Maven:

<dependency>
  <groupId>com.google.crypto.tink</groupId>
  <artifactId>apps-webpush</artifactId>
  <version>1.6.1</version>
</dependency>

To add a dependency using Gradle:

dependencies {
  implementation 'com.google.crypto.tink:apps-webpush:1.6.1'
}

Encryption

import com.google.crypto.tink.HybridEncrypt;
import java.security.interfaces.ECPublicKey;

ECPublicKey reicipientPublicKey = ...;
byte[] authSecret = ...;
HybridEncrypt hybridEncrypt = new WebPushHybridEncrypt.Builder()
     .withAuthSecret(authSecret)
     .withRecipientPublicKey(recipientPublicKey)
     .build();
byte[] plaintext = ...;
byte[] ciphertext = hybridEncrypt.encrypt(plaintext, null /* contextInfo, must be null */);

Decryption

import com.google.crypto.tink.HybridDecrypt;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;

ECPrivateKey recipientPrivateKey = ...;
ECPublicKey  recipientPublicKey = ...;
HybridDecrypt hybridDecrypt = new WebPushHybridDecrypt.Builder()
     .withAuthSecret(authSecret)
     .withRecipientPublicKey(recipientPublicKey)
     .withRecipientPrivateKey(recipientPrivateKey)
     .build();
byte[] ciphertext = ...;
byte[] plaintext = hybridDecrypt.decrypt(ciphertext, /* contextInfo, must be null */);