37 lines
979 B
C#
37 lines
979 B
C#
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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 CircleScape.Encryption {
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class Cipher {
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static void ksa(byte[] state, byte[] key) {
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int i, j = 0, t;
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for(i = 0; i < 256; ++i)
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state[i] = (byte)i;
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for(i = 0; i < 256; ++i) {
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j = (j + state[i] + key[i % key.Length]) % 256;
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t = state[i];
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state[i] = state[j];
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state[j] = (byte)t;
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}
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}
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static void prga(byte[] state, byte[] cipher) {
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int i = 0, j = 0, x, t;
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for(x = 0; x < cipher.Length; ++x) {
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i = (i + 1) % 256;
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j = (j + state[i]) % 256;
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t = state[i];
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state[i] = state[j];
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state[j] = (byte)t;
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cipher[x] = state[(state[i] + state[j]) % 256];
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}
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}
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}
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}
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