Java

ARC4 Encryption (ARCFOUR)

See more Encryption Examples

ARC4 (ARCFOUR) encryption. The Chilkat encryption component supports the ARC4 streaming encryption algorithm. Chilkat2 Java

import com.chilkatsoft.chilkat2.Crypt2;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example assumes the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Crypt2 crypt = new Crypt2();

        // Set the encryption algorithm = "arc4"
        crypt.setCryptAlgorithm("arc4");

        // KeyLength may range from 1 byte to 256 bytes.
        // (i.e. 8 bits to 2048 bits)
        // ARC4 key sizes are typically in the range of
        // 40 to 128 bits.
        // The KeyLength property is specified in bits:
        crypt.setKeyLength(128);

        // Note: The PaddingScheme and CipherMode properties
        // do not apply w/ ARC4.  ARC4 does not encrypt in blocks --
        // it is a streaming encryption algorithm. The number of output bytes
        // is exactly equal to the number of input bytes.

        // EncodingMode specifies the encoding of the output for
        // encryption, and the input for decryption.
        // It may be "hex", "url", "base64", or "quoted-printable".
        crypt.setEncodingMode("hex");

        // Note: ARC4 does not utilize initialization vectors.  IV's only
        // apply to block encryption algorithms.

        // The secret key must equal the size of the key.
        // For 128-bit encryption, the binary secret key is 16 bytes.
        String keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";
        crypt.setEncodedKey(keyHex, "hex");

        // Encrypt a string...
        // The output length is exactly equal to the input.  In this
        // example, the input string is 44 chars (ANSI bytes) so the
        // output is 44 bytes -- and when hex encoded results in an
        // 88-char string (2 chars per byte for the hex encoding).
        String encStr = crypt.encryptStringENC("The quick brown fox jumps over the lazy dog.");
        System.out.println(encStr);

        // Now decrypt:
        String decStr = crypt.decryptStringENC(encStr);
        System.out.println(decStr);
    }
}