Java

AES XTS Mode

See more Encryption Examples

Demonstrates the AES-XTS mode of operation.

Note: This example requires Chilkat v9.5.0.91 or greater.

Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
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.

        // Here we have a sample from CAVS validatition data:

        // COUNT = 301
        // DataUnitLen = 200
        // Key =
        // 394c97881abd989d29c703e48a72b397
        // a7acf51b59649eeea9b33274d8541df4
        // i = 4b15c684a152d485fe9937d39b168c29
        // PT = 2f3b9dcfbae729583b1d1ffdd16bb6fe2757329435662a78f0
        // CT = f3473802e38a3ffef4d4fb8e6aa266ebde553a64528a06463e

        // Note: The above sample requires an AES-XTS implementation that fully supports ciphertext-stealing
        // because the data to be encrypted is not an even multiple of the AES block size (i.e. not a multiple of 16 bytes).
        // Chilkat fully supports AES-XTS with ciphertext stealing.
        // (i.e. Chilkat implements XEX-based tweaked-codebook mode with ciphertext stealing (XTS))

        String key = "394c97881abd989d29c703e48a72b397";
        String tweakKey = "a7acf51b59649eeea9b33274d8541df4";
        String dataUnit = "4b15c684a152d485fe9937d39b168c29";

        BinData bd = new BinData();
        bd.appendEncoded("2f3b9dcfbae729583b1d1ffdd16bb6fe2757329435662a78f0", "hex");

        Crypt2 crypt = new Crypt2();

        crypt.setCryptAlgorithm("aes");
        crypt.setCipherMode("xts");
        crypt.setKeyLength(128);

        crypt.setEncodedKey(key, "hex");
        crypt.xtsSetEncodedTweakKey(tweakKey, "hex");
        crypt.xtsSetEncodedTweakValue(dataUnit, "hex");

        // In-place encrypt the contents of bd.
        crypt.encryptBd(bd);

        System.out.println("CT = " + bd.getEncoded("hexlower"));

        // Decrypt to revert back to the unencrypted content:
        crypt.decryptBd(bd);

        System.out.println("PT = " + bd.getEncoded("hexlower"));

        // Output:
        // CT = f3473802e38a3ffef4d4fb8e6aa266ebde553a64528a06463e
        // PT = 2f3b9dcfbae729583b1d1ffdd16bb6fe2757329435662a78f0
    }
}