ebsbase64encoder.cs

using System;
using System.Text;

namespace EBSCoder
{
    internal class EbsBase64Encoder
    {
        public string ConvertStringToBase64(string input)
        {
            string binaryRepresentation = ConvertStringToBinary(input);
            string base64Result = ConvertBinaryToBase64(binaryRepresentation);
            return base64Result;
        }

        private string ConvertStringToBinary(string input)
        {
            StringBuilder binaryResult = new StringBuilder();
            foreach (char c in input)
            {
                binaryResult.Append(Convert.ToString(c, 2).PadLeft(8, '0'));
            }
            return binaryResult.ToString();
        }

        private string ConvertBinaryToBase64(string binaryStr)
        {
            const string base64Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

            // Eksik bitleri doldur
            while (binaryStr.Length % 6 != 0)
            {
                binaryStr += '0';
            }

            StringBuilder result = new StringBuilder();

            // 6 bitlik bloklara ayır ve Base64'e çevir
            for (int i = 0; i < binaryStr.Length; i += 6)
            {
                string block = binaryStr.Substring(i, 6);
                int decimalValue = Convert.ToInt32(block, 2);
                result.Append(base64Chars[decimalValue]);
            }

            return result.ToString();
        }
    }
}


//Kullanımı

        EbsBase64Encoder converter = new EbsBase64Encoder();
        string inputText = "123";
        string base64Result = converter.ConvertStringToBase64(inputText);

        Console.WriteLine($"Original: {inputText}\nBase64: {base64Result}");