core/library/sodium-plus/docs/SodiumPlus/sealed-boxes.md

Sealed boxes

See also: Libsodium's documentation on its sealed boxes features.

crypto_box_seal

Anonymous public-key encryption. (Message integrity is still assured.)

Parameters and their respective types:

1. {string|Buffer} plaintext
2. {X25519PublicKey} public key

Returns a Promise that resolves to a Buffer.

crypto_box_seal_open

Anonymous public-key decryption. (Message integrity is still assured.)

Parameters and their respective types:

1. {Buffer} ciphertext
2. {X25519PublicKey} public key
3. {X25519SecretKey} secret key

Returns a Promise that resolves to a Buffer.

Example for crypto_box_seal

const { SodiumPlus } = require('sodium-plus');
let sodium;

(async function () {
    if (!sodium) sodium = await SodiumPlus.auto();
    let aliceKeypair = await sodium.crypto_box_keypair();
        let aliceSecret = await sodium.crypto_box_secretkey(aliceKeypair);
        let alicePublic = await sodium.crypto_box_publickey(aliceKeypair);
    
    let plaintext = 'Your message goes here';

    let ciphertext = await sodium.crypto_box_seal(plaintext, alicePublic);    
    console.log(ciphertext);

    let decrypted = await sodium.crypto_box_seal_open(ciphertext, alicePublic, aliceSecret);
    console.log(decrypted.toString());
})();