tweetnacl-ts/es/sealedbox.js

Port of TweetNaCl cryptographic library to TypeScript (and ES6)

import { ByteArray } from './array';
import { box, box_open, box_keyPair } from './box';
import { blake2b_init, blake2b_update, blake2b_final } from './blake2b';
export function sealedbox(m, pk) {
    var c = ByteArray(48 /* Overhead */ + m.length);
    var ek = box_keyPair();
    c.set(ek.publicKey);
    var nonce = nonce_gen(ek.publicKey, pk);
    var boxed = box(m, nonce, pk, ek.secretKey);
    c.set(boxed, ek.publicKey.length);
    // clear secret key
    for (var i = 0; i < ek.secretKey.length; i++)
        ek.secretKey[i] = 0;
    return c;
}
export function sealedbox_open(c, pk, sk) {
    if (c.length < 48 /* Overhead */)
        return;
    var epk = c.subarray(0, 32 /* PublicKey */);
    var nonce = nonce_gen(epk, pk);
    var boxData = c.subarray(32 /* PublicKey */);
    return box_open(boxData, nonce, epk, sk);
}
function nonce_gen(pk1, pk2) {
    var state = blake2b_init(24 /* Nonce */);
    blake2b_update(state, pk1);
    blake2b_update(state, pk2);
    return blake2b_final(state);
}
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