-
-
Save rvrsh3ll/28f7a147e344725a680cd55d78eb0f00 to your computer and use it in GitHub Desktop.
C# RC4 Sample
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
public class RC4 { | |
public static byte[] Encrypt(byte[] pwd, byte[] data) { | |
int a, i, j, k, tmp; | |
int[] key, box; | |
byte[] cipher; | |
key = new int[256]; | |
box = new int[256]; | |
cipher = new byte[data.Length]; | |
for (i = 0; i < 256; i++) { | |
key[i] = pwd[i % pwd.Length]; | |
box[i] = i; | |
} | |
for (j = i = 0; i < 256; i++) { | |
j = (j + box[i] + key[i]) % 256; | |
tmp = box[i]; | |
box[i] = box[j]; | |
box[j] = tmp; | |
} | |
for (a = j = i = 0; i < data.Length; i++) { | |
a++; | |
a %= 256; | |
j += box[a]; | |
j %= 256; | |
tmp = box[a]; | |
box[a] = box[j]; | |
box[j] = tmp; | |
k = box[((box[a] + box[j]) % 256)]; | |
cipher[i] = (byte)(data[i] ^ k); | |
} | |
return cipher; | |
} | |
public static byte[] Decrypt(byte[] pwd, byte[] data) { | |
return Encrypt(pwd, data); | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment