Question

I want to encrypt string to base64, the string input can be in differential length(the limit is 16 charcters), and I want to get the encrypted string in fixed length.

Does anyone know about the way to do that in .NET framework? or has an algorithm to do that?

Answer 1

If you’re looking for 1-way encryption (no need to decrypt), you can use SHA1

        string secretKey = "MySecretKey";
        string salt = "123";
        System.Security.Cryptography.SHA1 sha = System.Security.Cryptography.SHA1.Create();
        byte[] preHash = System.Text.Encoding.UTF32.GetBytes(secretKey + salt);
        byte[] hash = sha.ComputeHash(preHash);
        string password = System.Convert.ToBase64String(hash);

If you want to encrypt and decrypt, you could probably use RSA.