tweetnacl-ts/auth.js

Port of TweetNaCl cryptographic library to TypeScript (and ES6)

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var array_1 = require("./array");
var hash_1 = require("./hash");
function auth(msg, key) {
    var out = array_1.ByteArray(32);
    out.set(hmac(msg, key).subarray(0, 32));
    return out;
}
exports.auth = auth;
var BLOCK_SIZE = 128;
var HASH_SIZE = 64;
function hmac(msg, key) {
    var buf = array_1.ByteArray(BLOCK_SIZE + Math.max(HASH_SIZE, msg.length));
    var i, innerHash;
    if (key.length > BLOCK_SIZE)
        key = hash_1.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_1.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_1.hash(buf.subarray(0, BLOCK_SIZE + innerHash.length));
}
exports.auth_full = hmac;
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