tweetnacl-ts/es/auth.js

Port of TweetNaCl cryptographic library to TypeScript (and ES6)

import { ByteArray } from './array';
import { hash } from './hash';
export function auth(msg, key) {
    var out = ByteArray(32);
    out.set(hmac(msg, key).subarray(0, 32));
    return out;
}
var BLOCK_SIZE = 128;
var HASH_SIZE = 64;
function hmac(msg, key) {
    var buf = ByteArray(BLOCK_SIZE + Math.max(HASH_SIZE, msg.length));
    var i, innerHash;
    if (key.length > BLOCK_SIZE)
        key = hash(key);
    for (i = 0; i < BLOCK_SIZE; i++)
        buf[i] = 0x36;
    for (i = 0; i < key.length; i++)
        buf[i] ^= key[i];
    buf.set(msg, BLOCK_SIZE);
    innerHash = hash(buf.subarray(0, BLOCK_SIZE + msg.length));
    for (i = 0; i < BLOCK_SIZE; i++)
        buf[i] = 0x5c;
    for (i = 0; i < key.length; i++)
        buf[i] ^= key[i];
    buf.set(innerHash, BLOCK_SIZE);
    return hash(buf.subarray(0, BLOCK_SIZE + innerHash.length));
}
export var auth_full = hmac;
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