tweetnacl-java
TweetNacl in Java: port of tweetnacl-js
Download
Using Gradle
implementation "io.github.instantwebp2p:tweetnacl-java:1.1.2"
API/Usage
Suggest always use TweetNaclFast implementation
Public key authenticated encryption
- get key pair: Box.KeyPair kp = Box.keyPair(), kp = Box.keyPair_fromSecretKey(sk)
- new Box object: Box box = new Box(theirPublicKey, mySecretKey, Nonce);
- encryption: cipher = box.box(message);
- decryption: message = box.open(cipher);
- Nonce MUST be unique for ever message passed between same peers
As an alternative, the nonce can be omitted from the Box() call, and passed in the box and open calls, like:
- byte [] nonce = new byte[nonceLength], randombytes(theNonce, nonceLength);
- Box.KeyPair kp = Box.keyPair(), kp = Box.keyPair_fromSecretKey(sk)
- Box box = new Box(theirPublicKey, mySecretKey);
- encryption: cipher = box.box(message, nonce);
- decryption: message = box.open(cipher, nonce);
Secret key authenticated encryption
- get shared key: crypto random, what you have
- new SecretBox object: SecretBox sbox = new SecretBox(sharedKey, Nonce);
- encryption: cipher = sbox.box(message);
- decryption: message = sbox.open(cipher);
- Nonce MUST be unique for ever message passed between same peers
As an alternative, the nonce can be omitted from the SecretBox() call, and passed in the box and open calls, like:
- byte [] nonce = new byte[nonceLength], randombytes(theNonce, nonceLength);
- SecretBox sbox = new SecretBox(sharedKey);
- cipher = sbox.box(message, nonce);
- decryption: message = sbox.open(cipher, nonce);
Signature
- get key pair: Signature.KeyPair kp = Signature.keyPair(), kp = Signature.keyPair_fromSecretKey(sk);
- new Signature object: Signature sig = new Signature(theirPublicKey, mySecretKey);
- sign: signedMessage = sig.sign(message);
- verify: message = sig.open(signedMessage);
- Nonce MUST be unique for ever message passed between same peers
Hash
- generate SHA-512: byte [] tag = Hash.sha512(message);
Refer to com.iwebpp.crypto.tests for details
About Random generation
- the library uses java.security.SecureRandom for key generation
- you can always use the library to generate key, or use a Crypto Random like java.security.SecureRandom
Testing
In top directory:
$ mvn test
Support us
- Welcome contributing on document, codes, tests and issues
License MIT
- Copyright(2014-present) by tom zhou, appnet.link@gmail.com