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<!DOCTYPE html>
<html>
<head>
<meta name="description" content="WebCrypto Test">
  <meta charset="utf-8">
  <title>WebCrypto Test</title>
  <script src="https://cdn.rawgit.com/vibornoff/asmcrypto.js/release/asmcrypto.js"></script>
</head>
<body>
  <button onclick="webcr()">WebCrypto</button>
  <pre id="pre"></pre>
</body>
</html>
 
var data = new Uint8Array(32);
var key = new Uint8Array(32);
var transformRounds = 18000000 / 1;
var subtle = window.crypto ? window.crypto.subtle || window.crypto.webkitSubtle : null;
var MaxRoundsPreIteration = 10000;
function encrypt(data, key, rounds, callback) {
    subtle.importKey('raw', key.buffer, {name: 'AES-CBC'}, false, ['encrypt']).then(function (encKey) {
        var result = new Uint8Array(32);
        var partsLeft = 2;
        encryptBlock(data.subarray(0, 16), encKey, rounds, result, function(enc) {
            for (var i = 0; i < 16; i++) {
                result[i] = enc[i];
            }
            if (!--partsLeft) {
                callback(result);
            }
        });
        encryptBlock(data.subarray(16), encKey, rounds, result, function(enc) {
            for (var i = 0; i < 16; i++) {
                result[i + 16] = enc[i];
            }
            if (!--partsLeft) {
                callback(result);
            }
        });
    });
}
function encryptBlock(iv, encKey, rounds, result, complete, buffer) {
    var actualRounds = Math.min(MaxRoundsPreIteration, rounds);
    var leftRounds = rounds - actualRounds;
    var dataLen = 16 * actualRounds;
    var zeroData = buffer ? buffer.length === dataLen ? buffer : buffer.subarray(0, dataLen) : new Uint8Array(dataLen);
    subtle.encrypt({name: 'AES-CBC', iv: iv}, encKey, zeroData).then(function (encData) {
        var encDataArr = new Uint8Array(encData, (actualRounds - 1) * 16, 16);
        if (leftRounds) {
            encryptBlock(encDataArr, encKey, leftRounds, result, complete, buffer || zeroData);
        } else {
            complete(encDataArr);
        }
    });
}
function webcr() {
    var now = performance.now();
    encrypt(data, key, transformRounds, function(result) {
        pre.innerHTML += 'WebCrypto ' + Math.round(performance.now() - now) + 'ms: ' + asmCrypto.bytes_to_hex(result) + '\n';
    });
}
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