C# Extension Method Issue

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Mar 28th, 2015

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using System;
using System.Security.Cryptography;
using System.Text;
namespace MrSparklysManagementSystem
{
public class DataProtect
// Class to encrypt and decrypt strings.
// Various terms were not recognized until I added the System.Security reference manually via the explorer!
{
public string Protect // ISSUE HERE: "Extension methods must be static"
// Encrypts a string.
(
this string decryptedText,
string optionalEntropy = null,
DataProtectionScope scope = DataProtectionScope.CurrentUser
)
{
if (decryptedText == null)
throw new ArgumentNullException("decryptedText");
byte[] clearBytes = Encoding.UTF8.GetBytes(decryptedText);
byte[] entropyBytes = string.IsNullOrEmpty(optionalEntropy)
? null
: Encoding.UTF8.GetBytes(optionalEntropy);
byte[] encryptedBytes = ProtectedData.Protect(clearBytes, entropyBytes, scope);
return Convert.ToBase64String(encryptedBytes);
}
public string Unprotect // ISSUE HERE: "Extension methods must be static"
// Decrypts a string.
(
this string encryptedText,
string optionalEntropy = null,
DataProtectionScope scope = DataProtectionScope.CurrentUser
)
{
if (encryptedText == null)
throw new ArgumentNullException("encryptedText");
byte[] encryptedBytes = Convert.FromBase64String(encryptedText);
byte[] entropyBytes = string.IsNullOrEmpty(optionalEntropy)
? null
: Encoding.UTF8.GetBytes(optionalEntropy);
byte[] clearBytes = ProtectedData.Unprotect(encryptedBytes, entropyBytes, scope);
return Encoding.UTF8.GetString(clearBytes);
}
}
}

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