Sha256: a1616149f319304a5bf76336025a5b83c38d342cde52265d9bfde7bb08499e2f
Contents?: true
Size: 1.24 KB
Versions: 271
Compression:
Stored size: 1.24 KB
Contents
using System;
using System.Collections.Generic;
using System.Linq;
public static class AtbashCipher
{
private const int BlockSize = 5;
private const string Plain = "abcdefghijklmnopqrstuvwxyz0123456789";
private const string Cipher = "zyxwvutsrqponmlkjihgfedcba0123456789";
public static string Encode(string plainValue)
=> string.Join(" ", EncodeInBlocks(GetEncodedCharacters(plainValue)));
public static string Decode(string encodedValue)
=> new string(encodedValue.Replace(" ", "").Select(Decode).ToArray());
private static IEnumerable<char> GetEncodedCharacters(string words)
=> GetValidCharacters(words).Select(Encode);
private static IEnumerable<char> GetValidCharacters(string words)
=> words.ToLowerInvariant().Where(char.IsLetterOrDigit);
private static char Encode(char c) => Cipher[Plain.IndexOf(c)];
private static char Decode(char c) => Plain[Cipher.IndexOf(c)];
private static IEnumerable<string> EncodeInBlocks(IEnumerable<char> value)
{
var valueAsString = new string(value.ToArray());
for (var i = 0; i < valueAsString.Length; i += BlockSize)
yield return valueAsString.Substring(i, Math.Min(BlockSize, valueAsString.Length - i));
}
}
Version data entries
271 entries across 271 versions & 1 rubygems