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crypto.html
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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- <meta http-equiv="Content-Type" content="text/html; charset=windows-1252"> -->
<title></title>
<style>
textarea {
height: 10em;
width: 100%;
}
button {
font-size: x-large;
padding: 15px;
width: 200px;
}
</style>
</head>
<body>
<p>
I want to:
<label><input type="radio" name="action" value="encrypt" /> Encrypt</label>
<label><input type="radio" name="action" value="decrypt" checked /> Decrypt</label>
</p>
<div id="encryptPanel">
<p>
<label for="encryptPanelPublicKey">Other party's public key</label>
<textarea id="encryptPanelPublicKey" placeholder="Enter recipient's public key here"></textarea>
</p>
<p>
<label for="encryptPanelPlainText">Plain text</label>
<textarea id="encryptPanelPlainText" placeholder="Enter text to encrypt here"></textarea>
<button id="encryptButton">Encrypt</button>
</p>
<p>
<label for="encryptPanelCipherText">Cipher text</label>
<textarea id="encryptPanelCipherText" readonly></textarea>
</p>
</div>
<div id="decryptPanel">
<p>
<label for="decryptPanelPublicKey">My public key</label>
<textarea id="decryptPanelPublicKey" readonly></textarea>
<button id="generateKeysButton">Generate keys</button>
</p>
<p>
<label for="decryptPanelCipherText">Cipher text</label>
<textarea id="decryptPanelCipherText" placeholder="Enter encrypted text here"></textarea>
<button id="decryptButton">Decrypt</button>
</p>
<p>
<label for="decryptPanelPlainText">Plain text</label>
<textarea id="decryptPanelPlainText" readonly></textarea>
</p>
</div>
<script>
var qs = document.querySelector.bind(document);
var encryptRadio = qs('input[value=encrypt]');
var decryptRadio = qs('input[value=decrypt]');
var encryptPanel = qs('#encryptPanel');
var decryptPanel = qs('#decryptPanel');
var generateKeysButton = qs('#generateKeysButton');
var encryptPanelPublicKey = qs('#encryptPanelPublicKey');
var encryptPanelCipherText = qs('#encryptPanelCipherText');
var decryptPanelPublicKey = qs('#decryptPanelPublicKey');
var decryptPanelPlainText = qs('#decryptPanelPlainText');
var showElement = function (element, visible) {
element.setAttribute('style', visible ? '' : 'display: none;');
};
showElement(encryptPanel, encryptRadio.checked);
showElement(decryptPanel, decryptRadio.checked);
generateKeysButton.focus();
encryptRadio.addEventListener('change', function() {
showElement(encryptPanel, true);
showElement(decryptPanel, false);
encryptPanelPublicKey.select();
});
decryptRadio.addEventListener('change', function() {
showElement(decryptPanel, true);
showElement(encryptPanel, false);
});
generateKeysButton.addEventListener('click', function() {
generateKeysButton.disabled = true;
var originalTextContent = generateKeysButton.textContent;
generateKeysButton.textContent = 'Generating...';
generatePublicKey(function (publicKey) {
generateKeysButton.disabled = false;
generateKeysButton.textContent = originalTextContent;
decryptPanelPublicKey.value = publicKey;
decryptPanelPublicKey.select();
});
});
qs('#encryptButton').addEventListener('click', function() {
encryptData(encryptPanelPublicKey.value, qs('#encryptPanelPlainText').value, function (cipherText) {
encryptPanelCipherText.textContent = cipherText;
encryptPanelCipherText.select();
});
});
qs('#decryptButton').addEventListener('click', function() {
decryptData(privateKey, qs('#decryptPanelCipherText').value, function (plainText) {
decryptPanelPlainText.textContent = plainText;
decryptPanelPlainText.select();
});
});
var privateKey = null;
function generatePublicKey(callback) {
crypto.subtle
.generateKey(
{
name: 'RSA-OAEP',
modulusLength: 4096,
publicExponent: new Uint8Array([1, 0, 1]),
hash: {name: 'SHA-256'}
},
true,
['encrypt', 'decrypt']
)
.then(function (pair) {
privateKey = pair.privateKey;
return crypto.subtle.exportKey('spki', pair.publicKey);
})
.then(function (result) {
var publicKeyHex = arrayToHex(new Uint8Array(result));
callback(publicKeyHex);
});
}
function encryptData(key, plainText, callback) {
var bufferLength = key.length / 2;
var pubBuffer = new ArrayBuffer(bufferLength);
var pubView = new Uint8Array(pubBuffer);
pubView.set(hexToArray(key));
crypto.subtle
.importKey(
'spki',
pubBuffer,
{
name: 'RSA-OAEP',
hash: {name: 'SHA-256'}
},
false,
['encrypt']
)
.then(function (key) {
var vector = crypto.getRandomValues(new Uint8Array(16));
return crypto.subtle.encrypt({name: 'RSA-OAEP'}, key, (new TextEncoder).encode(plainText))
})
.then(function (result) {
var cipherText = new Uint8Array(result);
var cipherTextHex = arrayToHex(cipherText);
callback(cipherTextHex);
});
}
function decryptData(key, cipherTextHex, callback) {
var cipherText = hexToArray(cipherTextHex);
crypto.subtle
.decrypt({name: 'RSA-OAEP'}, key, cipherText)
.then(function (result) {
var plainTextBytes = new Uint8Array(result);
var plainText = (new TextDecoder).decode(plainTextBytes);
callback(plainText);
});
}
function arrayToHex(array) {
return array.reduce(function (previousValue, currentValue) {
return previousValue + (currentValue < 16 ? '0' : '') + currentValue.toString(16);
}, '');
}
function hexToArray(hex) {
return new Uint8Array(hex.match(/../g).map(function (currentValue) {
return parseInt(currentValue, 16);
}));
}
</script>
</body>
</html>