Encrypt and Decrypt a String in ASP.NET

Encrypt and decrypt are very important data with C# play. For security purpose, we are storing some valuable things in Encrypt format.

I have two code examples that I wrote for best practices encrypting a string and second is again Decrypt the value.

Microsoft has a simple method to convert string in Encrypt and Decrypt at any time.

Encrypt and Decrypt Simple Method

string encryptedString = SomeStaticClass.Encrypt(sourceString);

string decryptedString = SomeStaticClass.Decrypt(encryptedString);

To use the code sample, you can copy the CryptorEngine to your project and start playing or copy method bodies and paste to your application projects.

I wrote a class to access the Encrypt and Decrypt Method. because I wanted to use this method at many places. And this made my programming simple.

Encrypt and Decrypt Using Class

public string DecryptString(string encrString)
{
    byte[] b;
    string decrypted;
    try
    {
        b = Convert.FromBase64String(encrString);
        decrypted = System.Text.ASCIIEncoding.ASCII.GetString(b);
    }
    catch (FormatException fe)
    {
        decrypted = "";
    }
    return decrypted;
}

public string EnryptString(string strEncrypted)
{
    byte[] b = System.Text.ASCIIEncoding.ASCII.GetBytes(strEncrypted);
    string encrypted = Convert.ToBase64String(b);
    return encrypted;
}

Still The above code is not enough for me because I want to do something with my choice. Then I had implemented the code with specify charter to use in Encrypt method. I have created two method class.

 

Encrypt and Decrypt with Character Choice

public string encrypt(string encryptString)
{
    string EncryptionKey = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    byte[] clearBytes = Encoding.Unicode.GetBytes(encryptString);
    using(Aes encryptor = Aes.Create())
    {
        Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] {
            0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76
        });
        encryptor.Key = pdb.GetBytes(32);
        encryptor.IV = pdb.GetBytes(16);
        using(MemoryStream ms = new MemoryStream())
        {
            using(CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write)) {
                cs.Write(clearBytes, 0, clearBytes.Length);
                cs.Close();
            }
            encryptString = Convert.ToBase64String(ms.ToArray());
        }
    }
    return encryptString;
}

public string Decrypt(string cipherText)
{
    string EncryptionKey = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    cipherText = cipherText.Replace(" ", "+");
    byte[] cipherBytes = Convert.FromBase64String(cipherText);
    using(Aes encryptor = Aes.Create())
    {
        Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] {
            0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76
        });
        encryptor.Key = pdb.GetBytes(32);
        encryptor.IV = pdb.GetBytes(16);
        using(MemoryStream ms = new MemoryStream())
        {
            using(CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write)) {
                cs.Write(cipherBytes, 0, cipherBytes.Length);
                cs.Close();
            }
            cipherText = Encoding.Unicode.GetString(ms.ToArray());
        }
    }
    return cipherText;
}

At last the above code is totally perfect to make such a good application and now I'm filling good because I did what I want.

Thanks for more code visit stupidcodes.com