95 lines
2.9 KiB
C#
95 lines
2.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace crypto
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{
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class CryptoPerso
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{
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//Basé sur le cryptage césar
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private const string alphabet = @"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXTZ0123456789&@,?;.:/ ";
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public string Alphabet { get { return alphabet; } set { } }
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private byte[] alphabetArray = Encoding.ASCII.GetBytes(alphabet);
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private byte[] textArray;
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public CryptoPerso()
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{
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}
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public byte[] StrToInt(string texte)
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{
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List<byte> tmp = new List<byte>();
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textArray = Encoding.ASCII.GetBytes(texte);
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for(int i=0; i<textArray.Length;i++)
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{
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byte j;
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for (j = 0; textArray[i] != alphabetArray[j] && j < alphabetArray.Length; j++);
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tmp.Add(j);
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}
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return tmp.ToArray();
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}
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public byte[] IntToStr(byte[] textArray)
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{
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List<byte> tmp = new List<byte>();
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for (int i = 0; i < textArray.Length; i++)
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{
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tmp.Add(alphabetArray[textArray[i]]);
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}
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return tmp.ToArray();
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}
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public string Crypt(string texte, string pw)
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{
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try
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{
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byte[] texteInt = StrToInt(texte);
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byte[] pwInt = StrToInt(pw);
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List<byte> tmp = new List<byte>();
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for (int i = 0; i < texteInt.Length; i++)
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{
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byte a = (byte)((texteInt[i] + pwInt[i % (pwInt.Length)]) % (alphabetArray.Length));
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tmp.Add(a);
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}
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return Encoding.ASCII.GetString(IntToStr(tmp.ToArray()));
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}
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catch(Exception e)
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{
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warn w = new warn("ERREUR : "+e.ToString());
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w.Show();
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Console.WriteLine(e.ToString());
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return null;
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}
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}
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public string decryptage(string texte, string pw)
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{
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try
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{
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byte[] texteInt = StrToInt(texte);
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byte[] pwInt = StrToInt(pw);
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List<byte> tmp = new List<byte>();
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for (int i = 0; i < texteInt.Length; i++)
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{
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if (texteInt[i] < pwInt[i % (pwInt.Length)])
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texteInt[i] += (byte)(alphabet.Length);
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byte a = (byte)((texteInt[i] - pwInt[i % (pwInt.Length)]));
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tmp.Add(a);
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}
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return Encoding.ASCII.GetString(IntToStr(tmp.ToArray()));
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}
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catch (Exception e)
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{
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warn w = new warn("ERREUR : "+e.ToString());
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w.Show();
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Console.WriteLine(e.ToString());
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return null;
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}
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}
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}
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}
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