Sha256: 966351fc4a53977d3ddb0f2ac89a7de751d4cca43e1f2bd1bffbf7cb6474ec4d
Contents?: true
Size: 1.49 KB
Versions: 188
Compression:
Stored size: 1.49 KB
Contents
using System;
using System.Collections.Generic;
using System.Linq;
public static class CryptoSquare
{
public static string NormalizedPlaintext(string plaintext) => new string(plaintext.ToLowerInvariant().Where(char.IsLetterOrDigit).ToArray());
public static IEnumerable<string> PlaintextSegments(string plaintext)
{
var normalizedPlaintext = NormalizedPlaintext(plaintext);
return Chunks(normalizedPlaintext, Size(normalizedPlaintext));
}
public static string Encoded(string plaintext) => string.Join("", Transpose(PlaintextSegments(plaintext)));
public static string Ciphertext(string plaintext) => string.Join(" ", Transpose(PlaintextSegments(plaintext).Select(x => x.PadRight(Size(NormalizedPlaintext(plaintext))))));
private static int Size(string normalizedPlaintext) => (int)Math.Ceiling(Math.Sqrt(normalizedPlaintext.Length));
private static IEnumerable<string> Chunks(string str, int chunkSize)
{
if (str.Length == 0)
return Enumerable.Empty<string>();
return Enumerable
.Range(0, (int) Math.Ceiling(str.Length / (double) chunkSize))
.Select(i => str.Substring(i * chunkSize, Math.Min(str.Length - i * chunkSize, chunkSize)));
}
private static IEnumerable<string> Transpose(IEnumerable<string> input)
=> input
.SelectMany(s => s.Select((c, i) => Tuple.Create(i, c)))
.GroupBy(x => x.Item1)
.Select(g => new string(g.Select(t => t.Item2).ToArray()));
}
Version data entries
188 entries across 188 versions & 1 rubygems