algorithms-and-data-structures/AlgorithmsAndDataStructures/Algorithms/Cryptography/CesarCipher.cs at master · arst/algorithms-and-data-structures · GitHub

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using System.Text;

namespace AlgorithmsAndDataStructures.Algorithms.Cryptography;

public class CesarCipher
{
#pragma warning disable CA1822 // Mark members as static
    public string Encode(string input, byte padding)
#pragma warning restore CA1822 // Mark members as static
    {
        if (string.IsNullOrEmpty(input)) return string.Empty;

        var resultBuilder = new StringBuilder(input.Length);

        foreach (var symbol in input) resultBuilder.Append((char)((byte)symbol + padding));

        return resultBuilder.ToString();
    }

#pragma warning disable CA1822 // Mark members as static
    public string Decode(string input, byte padding)
#pragma warning restore CA1822 // Mark members as static
    {
        if (string.IsNullOrEmpty(input)) return string.Empty;

        var resultBuilder = new StringBuilder(input.Length);

        foreach (var symbol in input) resultBuilder.Append((char)((byte)symbol - padding));

        return resultBuilder.ToString();
    }
}