Why when converting string to byte[] using Convert.FromBase64String(...) i can't put two same characters?

Question

For example I have

 class User
{
    public string Login { get; set; }
    public byte[] Password { get; set; }

}
class Program
{
    static void Main(string[] args)
    {
        var login = Console.ReadLine();
        var password = Console.ReadLine();
        var bytePass = Convert.FromBase64String(password);

        var user = new User() { Login = login, Password = bytePass };

    }
}

When I put as password string with two same characters ("testt" for example) it throw exception

System.FormatException: „The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters.”

What I should to do if I want convert string which multiple same characters to byte[]? Is it even possible?

You are using `FromBase64String` so the password is expected to be a `base64strin` and not `testt` — Alen.Toma, Dec 03 '21 at 16:05
Convert.FromBase64String(...) converts a base64 encoded string to byte array. Your input string is not base64 encoded that's why you are getting this error. Can you explain what you are trying to do? Why are you using Convert.FromBase64String(...)? — Chetan, Dec 03 '21 at 16:07
https://stackoverflow.com/questions/16072709/converting-string-to-byte-array-in-c-sharp — Chetan, Dec 03 '21 at 16:08
Please tell me you're not going to store passwords without hashing and salting? — DavidG, Dec 03 '21 at 16:09

score 1 · Answer 1 · answered Dec 03 '21 at 16:09

1

The string testt is not a Base64-encoded string. The length of a Base64 string must be a multiple of four.

To convert a regular string to a sequence of bytes, use the Encoding.GetBytes method.

answered Dec 03 '21 at 16:09

Richard Deeming

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Why when converting string to byte[] using Convert.FromBase64String(...) i can't put two same characters?

1 Answers1