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ARC4 Encryption (ARCFOUR)Download: Chilkat .NET Assemblies Demonstrates simple ARC4 encryption to match some simple test vectors published by Wikipedia. ARC4 is a fast stream cipher supporting key lengths from 8 to 2048 bits (i.e. from 1 to 256 bytes). It is not a block cipher, so there is no padding, no modes, and no initialization vector. Chilkat.Crypt2 crypt = new Chilkat.Crypt2(); bool success; success = crypt.UnlockComponent("Anything for 30-day trial"); if (success != true) { MessageBox.Show("Crypt component unlock failed"); return; } // Set the encryption algorithm to ARC4: crypt.CryptAlgorithm = "arc4"; // We want the encrypted output to be a hex-encoded string. crypt.EncodingMode = "hex"; // Encrypt some test vectors from Wikipedia: string cipherText; string plainText; // The key length (in bits) is equal to the number of us-ascii // bytes in our key string * 8. // ARC4( "Key", "Plaintext" ) == BBF316E8D940AF0AD3 crypt.KeyLength = 24; crypt.SetEncodedKey("Key","ascii"); cipherText = crypt.EncryptStringENC("Plaintext"); textBox1.Text += cipherText + "\r\n"; textBox1.Refresh(); plainText = crypt.DecryptStringENC(cipherText); textBox1.Text += plainText + "\r\n"; textBox1.Refresh(); // ARC4( "Wiki", "pedia" ) == 1021BF0420 crypt.KeyLength = 32; crypt.SetEncodedKey("Wiki","ascii"); cipherText = crypt.EncryptStringENC("pedia"); textBox1.Text += cipherText + "\r\n"; textBox1.Refresh(); plainText = crypt.DecryptStringENC(cipherText); textBox1.Text += plainText + "\r\n"; textBox1.Refresh(); // ARC4( "Secret", "Attack at dawn" ) == 45A01F645FC35B383552544B9BF5 crypt.KeyLength = 48; crypt.SetEncodedKey("Secret","ascii"); cipherText = crypt.EncryptStringENC("Attack at dawn"); textBox1.Text += cipherText + "\r\n"; textBox1.Refresh(); plainText = crypt.DecryptStringENC(cipherText); textBox1.Text += plainText + "\r\n"; textBox1.Refresh(); // Note: The call to SetEncodedKey serves to set the key // to the us-ascii bytes of the string. |
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