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<head>
	<title>System.Security.Cryptography.RSA</title>
	<link type="text/css" rel="stylesheet" href="../System.Web.UI.Interface.debug.css" />
	<script type="text/javascript" language="JavaScript" src="../System.debug.js"></script>
	<script type="text/javascript" language="JavaScript" src="../System.IO.debug.js"></script>
	<script type="text/javascript" language="JavaScript" src="../System.Text.debug.js"></script>
	<script type="text/javascript" language="JavaScript" src="../System.Convert.debug.js"></script>
	<script type="text/javascript" language="JavaScript" src="../System.BitConverter.debug.js"></script>
	<script type="text/javascript" language="JavaScript" src="../System.BigInt.debug.js"></script>
	<script type="text/javascript" language="JavaScript" src="../System.Security.Cryptography.SHA1.debug.js"></script>
	<script type="text/javascript" language="JavaScript" src="../System.Security.Cryptography.debug.js"></script>
	<script type="text/javascript" language="JavaScript" src="../System.Security.Cryptography.RSA.debug.js"></script>
	<script type="text/javascript" language="javascript">

		//#region Log Function

		function WriteLog(text) {
			Trace.Write("<code>" + text + "</code>");
		}

		function WriteEnc(input, output) {
			WriteLog("Transform: " + System.BitConverter.ToString(input, '') +
			" -> " + System.BitConverter.ToString(output, ''));
		}

		//#endregion

		// http://www.leemon.com/crypto/BigInt.html
		//http: //www.di-mgt.com.au/rsa_alg.html#note1

		function Window_Load() {
			Trace.IsEnabled = true;
			WriteLog("Start Demo");
			$("EncryptButton").onclick = EncryptButton_Click;
			$("DecryptButton").onclick = DecryptButton_Click;
			$("TestButton").onclick = TestButton_Click;
			$("NewKeyButton").onclick = NewKeyButton_Click;
			$("KeyTextBox").value = xmlParamsDefault;
		}

		window.onload = Window_Load;

		// RSA 512 bit key.
		var xmlParamsDefault =
			"<RSAKeyValue>" +
				"<Modulus>pxtmFnrGI6Sb8ziyY+NRUDuQ4b/ETw5WabQ4daFQqzsCEr/6J/LLBU/2D5mO5/Wu5U/Rya1E55aYFZeaZMNqAw==</Modulus>" +
				"<Exponent>AQAB</Exponent>" +
				"<P>2TsVXWPEvDIJv/gd2rX9k0UOyXuaYgoAchIH6vUicis=</P>" +
				"<Q>xO4+OYREQfqYRQK7y73+RaUG0IxobT0OQ0c+Ok2hc4k=</Q>" +
				"<DP>K7/xgpiIU9rECeyfnp/OjS14V+3T3vDivBaTj6eFI3c=</DP>" +
				"<DQ>K4N9ClZ4gp+tn6oP9t//XEIvtEsiE+kmyqTmUhmvMAk=</DQ>" +
				"<InverseQ>p7o4BOlKZQZ693R1ViZ66y5gTjUkNNTd2za7/1YGBCs=</InverseQ>" +
				"<D>XZqFVrYy4qhECruJgVZFp/GVuD5Y0gev88nVjl5r911QT+I8vgJSklTso7jTlpMtf2oe7UZ0WRWEtgPS3tZn4Q==</D>" +
			"</RSAKeyValue>";

		function GetNewRsaProvider(dwKeySize) {
			// Create a new instance of RSACryptoServiceProvider.
			if (!dwKeySize) dwKeySize = 512;
			return new System.Security.Cryptography.RSACryptoServiceProvider(dwKeySize);
		}

		function NewKeyButton_Click(sender, e) {
			var keySize = Number($("KeySizeDropDownList").value);
			var rsa = GetNewRsaProvider(keySize);
			$("KeyTextBox").value = rsa.ToXmlString(true);
		}

		function GetRsaKey(includePrivateParameters) {
			var xmlParams = $("KeyTextBox").value;
			// ------------------------------------------------
			// RSA Keys
			// ------------------------------------------------
			var rsa = GetNewRsaProvider();
			// Import parameters from xml.
			rsa.FromXmlString(xmlParams);
			// Export RSA key to RSAParameters and include:
			//    false - Only public key required for encryption.
			//    true  - Private key required for decryption.
			return rsa.ExportParameters(includePrivateParameters);
		}

		function EncryptButton_Click(sender, e) {
			var decryptedBytes = System.Text.Encoding.UTF8.GetBytes($("DataTextBox").value);
			var doOaepPadding = $("PaddingDropDownList").options[$("PaddingDropDownList").selectedIndex].value == "OAEP";
			// ------------------------------------------------
			// Encrypt
			// ------------------------------------------------
			var rsa = GetNewRsaProvider();
			// Import the RSA Key information.
			rsa.ImportParameters(GetRsaKey(false));
			// Encrypt the passed byte array and specify OAEP padding.
			var encryptedBytes = rsa.Encrypt(decryptedBytes, doOaepPadding);
			var encryptedString = System.Convert.ToBase64String(encryptedBytes)
			// ------------------------------------------------
			// Display the encrypted data.
			//var encryptedString = System.BitConverter.ToString(encryptedBytes, "");
			$("EncryptedTextBox").value = encryptedString;
		}

		function DecryptButton_Click(sender, e) {
			//var encryptedBytes = System.Convert.HexStringToBytes($("EncryptedTextBox").value);
			var encryptedBytes = System.Convert.FromBase64String($("EncryptedTextBox").value);
			var doOaepPadding = $("PaddingDropDownList").options[$("PaddingDropDownList").selectedIndex].value == "OAEP";
			// ------------------------------------------------
			// Decrypt
			// ------------------------------------------------
			var rsa = GetNewRsaProvider();
			// Import the RSA Key information.
			rsa.ImportParameters(GetRsaKey(true));
			// Decrypt the passed byte array and specify OAEP padding.
			var decryptedBytes = rsa.Decrypt(encryptedBytes, doOaepPadding);
			// ------------------------------------------------
			// Display the decrypted data.
			var decryptedString = System.Text.Encoding.UTF8.GetString(decryptedBytes);
			$("DecryptedTextBox").value = decryptedString;
		}

		var maxTests = 0;

		function TestButton_Click(sender, e) {
			maxTests = 1000;
			setTimeout(DoWork, 10);
		}

		function DoWork(sender, e) {
			var text = $("DataTextBox").value;
			var decryptedBytes = System.Text.Encoding.UTF8.GetBytes(text);
			var doOaepPadding = $("PaddingDropDownList").options[$("PaddingDropDownList").selectedIndex].value == "OAEP";
			var rsa = GetNewRsaProvider();
			rsa.ImportParameters(GetRsaKey(true));
			var encryptedBytes = rsa.Encrypt(decryptedBytes, doOaepPadding);
			var decryptedString = "";
			try {
				// Decrypt the passed byte array and specify OAEP padding.
				decryptedBytes = rsa.Decrypt(encryptedBytes, doOaepPadding);
				decryptedString = System.Text.Encoding.UTF8.GetString(decryptedBytes);
			} catch (ex) {
				WriteLog(encryptedBytes);
			}
			maxTests--;
			var success = (text == decryptedString);
			WriteLog(maxTests + ". bytes: " + encryptedBytes.length + " " + success);
			if (maxTests > 0 && success) setTimeout(DoWork, 10);
		}


	</script>
	<style type="text/css">
		.style1
		{
			color: #808080;
		}
	</style>
</head>
<body>
	<table border="0" cellpadding="0" cellspacing="4">
		<tbody>
			<tr>
				<td>
					RSA Key:
				</td>
				<td>
					<textarea name="KeyTextBox" id="KeyTextBox" style="width: 500px;" cols="128" rows="3"></textarea>
					<br />
					<span class="style1">Note: You can use larger keys, but generation of keys larger than
						512-bits on</span><br class="style1" />
					<span class="style1">JavaScript is very slow.</span>
				</td>
				<td>
					<br />
					<select name="KeySizeDropDownList" id="KeySizeDropDownList">
						<option value="256">256-bit</option>
						<option value="384">384-bit</option>
						<option selected="selected" value="512">512-bit</option>
						<option value="768">768-bit</option>
						<option value="1024">1024-bit</option>
					</select><br />
					<input id="NewKeyButton" value="New Key" type="button" />
				</td>
			</tr>
			<tr>
				<td>
				</td>
				<td>
					Padding:
					<select name="PaddingDropDownList" id="PaddingDropDownList">
						<option selected="selected" value="PKCS">Direct Encryption (PKCS#1 v1.5)</option>
						<option value="OAEP">OAEP padding (PKCS#1 v2)</option>
					</select>
				</td>
			</tr>
			<tr>
				<td>
					Data:
				</td>
				<td>
					<input name="DataTextBox" value="abcdef_01234" id="DataTextBox" style="width: 500px;"
						type="text" />
				</td>
				<td>
					<input name="EncryptButton" value="Encrypt" id="EncryptButton" type="button" />
				</td>
			</tr>
			<tr>
				<td>
					Encrypted:
				</td>
				<td>
					<textarea name="EncryptedTextBox" id="EncryptedTextBox" style="width: 500px;" cols="128"
						rows="3"></textarea>
				</td>
				<td valign="bottom">
					<input name="DecryptButton" value="Decrypt" id="DecryptButton" type="button" />
					<input name="TestButton" value="Test" id="TestButton" type="button" style="display: none" />
				</td>
			</tr>
			<tr>
				<td>
					Decrypted:
				</td>
				<td>
					<textarea name="DecryptedTextBox" id="DecryptedTextBox" style="width: 500px;" cols="128"
						rows="3"></textarea>
				</td>
				<td>
				</td>
			</tr>
		</tbody>
	</table>
	<br />
	<iframe id="TraceLog" style="width: 100%; height: 200px;"></iframe>
</body>
</html>