tweetnacl-ts/es/secretbox.js

Port of TweetNaCl cryptographic library to TypeScript (and ES6)

import { ByteArray } from './array';
import { _verify_16 } from './verify';
import { _stream_xor, _stream } from './salsa20';
import { poly1305_init, poly1305_update, poly1305_finish } from './poly1305';
import { checkArrayTypes, checkLengths } from './check';
export function secretbox(msg, nonce, key) {
    checkArrayTypes(msg, nonce, key);
    checkLengths(key, nonce);
    var m = ByteArray(32 /* Zero */ + msg.length);
    var c = ByteArray(m.length);
    for (var i = 0; i < msg.length; i++)
        m[i + 32 /* Zero */] = msg[i];
    _secretbox(c, m, m.length, nonce, key);
    return c.subarray(16 /* Overhead */);
}
export function secretbox_open(box, nonce, key) {
    checkArrayTypes(box, nonce, key);
    checkLengths(key, nonce);
    var c = ByteArray(16 /* Overhead */ + box.length);
    var m = ByteArray(c.length);
    for (var i = 0; i < box.length; i++)
        c[i + 16 /* Overhead */] = box[i];
    if (c.length < 32 /* Zero */ || _secretbox_open(m, c, c.length, nonce, key) !== 0)
        return;
    return m.subarray(32 /* Zero */);
}
// low level
function _secretbox(c, m, d, n, k) {
    if (d < 32)
        return -1;
    _stream_xor(c, 0, m, 0, d, n, k);
    _onetimeauth(c, 16, c, 32, d - 32, c);
    for (var i = 0; i < 16; i++)
        c[i] = 0;
    return 0;
}
function _secretbox_open(m, c, d, n, k) {
    var x = ByteArray(32);
    if (d < 32)
        return -1;
    _stream(x, 0, 32, n, k);
    if (_onetimeauth_verify(c, 16, c, 32, d - 32, x) !== 0)
        return -1;
    _stream_xor(m, 0, c, 0, d, n, k);
    for (var i = 0; i < 32; i++)
        m[i] = 0;
    return 0;
}
export function _onetimeauth(out, outpos, m, mpos, n, k) {
    var s = poly1305_init(k);
    poly1305_update(s, m, mpos, n);
    poly1305_finish(s, out, outpos);
    return 0;
}
function _onetimeauth_verify(h, hpos, m, mpos, n, k) {
    var x = ByteArray(16);
    _onetimeauth(x, 0, m, mpos, n, k);
    return _verify_16(h, hpos, x, 0);
}
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