ProtectedData.Protect Method
.NET Framework 3.0
Protects the userData parameter and returns a byte array.
Namespace: System.Security.Cryptography
Assembly: System.Security (in system.security.dll)
Assembly: System.Security (in system.security.dll)
public static byte[] Protect ( byte[] userData, byte[] optionalEntropy, DataProtectionScope scope )
public static byte[] Protect ( byte[] userData, byte[] optionalEntropy, DataProtectionScope scope )
public static function Protect ( userData : byte[], optionalEntropy : byte[], scope : DataProtectionScope ) : byte[]
Not applicable.
Parameters
- userData
A byte array containing data to protect.
- optionalEntropy
An additional byte array used to encrypt the data.
- scope
One of the DataProtectionScope values.
Return Value
A byte array representing the encrypted data.This method can be used to protect data such as passwords, keys, or connection strings. The optionalEntropy parameter enables you to use additional information to protect the data. This information must also be used when unprotecting the data using the Unprotect method.
The following code example shows how to use data protection.
using System; using System.Security.Cryptography; public class DataProtectionSample { // Create byte array for additional entropy when using Protect method. static byte [] s_aditionalEntropy = { 9, 8, 7, 6, 5 }; public static void Main() { // Create a simple byte array containing data to be encrypted. byte [] secret = { 0, 1, 2, 3, 4, 1, 2, 3, 4 }; //Encrypt the data. byte [] encryptedSecret = Protect( secret ); Console.WriteLine("The encrypted byte array is:"); PrintValues(encryptedSecret); // Decrypt the data and store in a byte array. byte [] originalData = Unprotect( encryptedSecret ); Console.WriteLine("{0}The original data is:", Environment.NewLine); PrintValues(originalData); } public static byte [] Protect( byte [] data ) { try { // Encrypt the data using DataProtectionScope.CurrentUser. The result can be decrypted // only by the same current user. return ProtectedData.Protect( data, s_aditionalEntropy, DataProtectionScope.CurrentUser ); } catch (CryptographicException e) { Console.WriteLine("Data was not encrypted. An error occurred."); Console.WriteLine(e.ToString()); return null; } } public static byte [] Unprotect( byte [] data ) { try { //Decrypt the data using DataProtectionScope.CurrentUser. return ProtectedData.Unprotect( data, s_aditionalEntropy, DataProtectionScope.CurrentUser ); } catch (CryptographicException e) { Console.WriteLine("Data was not decrypted. An error occurred."); Console.WriteLine(e.ToString()); return null; } } public static void PrintValues( Byte[] myArr ) { foreach ( Byte i in myArr ) { Console.Write( "\t{0}", i ); } Console.WriteLine(); } }
import System.*;
import System.Security.Cryptography.*;
public class DataProtectionSample
{
// Create byte array for additional entropy when using Protect method.
private static ubyte sAditionalEntropy[] = { 9, 8, 7, 6, 5 };
public static void main(String args[])
{
// Create a simple byte array containing data to be encrypted.
ubyte secret[] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
//Encrypt the data.
ubyte encryptedSecret[] = Protect(secret);
Console.WriteLine("The encrypted byte array is:");
PrintValues(encryptedSecret);
// Decrypt the data and store in a byte array.
ubyte originalData[] = Unprotect(encryptedSecret);
Console.WriteLine("{0}The original data is:",
Environment.get_NewLine());
PrintValues(originalData);
} //main
public static ubyte[] Protect(ubyte data[])
{
try {
// Encrypt the data using DataProtectionScope.CurrentUser.
// The result can be decrypted only by the same current user.
return ProtectedData.Protect(data, sAditionalEntropy,
DataProtectionScope.CurrentUser);
}
catch (CryptographicException e) {
Console.WriteLine("Data was not encrypted. An error occurred.");
Console.WriteLine(e.ToString());
return null;
}
} //Protect
public static ubyte[] Unprotect(ubyte data[])
{
try {
//Decrypt the data using DataProtectionScope.CurrentUser.
return ProtectedData.Unprotect(data, sAditionalEntropy,
DataProtectionScope.CurrentUser);
}
catch (CryptographicException e) {
Console.WriteLine("Data was not decrypted. An error occurred.");
Console.WriteLine(e.ToString());
return null;
}
} //Unprotect
public static void PrintValues(ubyte myArr[])
{
for (int iCtr = 0; iCtr < myArr.length; iCtr++) {
ubyte i = myArr[iCtr];
Console.Write("\t{0}", System.Convert.ToString(i));
}
Console.WriteLine();
} //PrintValues
} //DataProtectionSample
- DataProtectionPermission with the associated ProtectData flag for permission to protect data.
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