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(Android™) AES XTS Mode where Tweak Value is Data Unit NumberDemonstrates the AES-XTS mode of operation where the tweak value is specified as a data unit number. Note: This example requires Chilkat v9.5.0.91 or greater.
// Important: Don't forget to include the call to System.loadLibrary // as shown at the bottom of this code sample. package com.test; import android.app.Activity; import com.chilkatsoft.*; import android.widget.TextView; import android.os.Bundle; public class SimpleActivity extends Activity { private static final String TAG = "Chilkat"; // Called when the activity is first created. @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. boolean success; // IEEE 1619 test vector 10 String key = "2718281828459045235360287471352662497757247093699959574966967627"; String tweakKey = "3141592653589793238462643383279502884197169399375105820974944592"; // The data unit number is 255 // We'll specify this numerically by calling XtsSetDataUnitNumber with 255, 0 (see below) String dataUnit = "00000000000000ff"; CkBinData bd = new CkBinData(); bd.AppendEncoded("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f","hex"); bd.AppendEncoded("202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f","hex"); bd.AppendEncoded("404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f","hex"); bd.AppendEncoded("606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f","hex"); bd.AppendEncoded("808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f","hex"); bd.AppendEncoded("a0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebf","hex"); bd.AppendEncoded("c0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedf","hex"); bd.AppendEncoded("e0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff","hex"); bd.AppendEncoded("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f","hex"); bd.AppendEncoded("202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f","hex"); bd.AppendEncoded("404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f","hex"); bd.AppendEncoded("606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f","hex"); bd.AppendEncoded("808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f","hex"); bd.AppendEncoded("a0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebf","hex"); bd.AppendEncoded("c0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedf","hex"); bd.AppendEncoded("e0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff","hex"); Log.i(TAG, "Size of plain-text: " + String.valueOf(bd.get_NumBytes())); // This is the expected ciphertext: // cipherText = "1c3b3a102f770386e4836c99e370cf9bea00803f5e482357a4ae12d414a3e63b" // + "5d31e276f8fe4a8d66b317f9ac683f44680a86ac35adfc3345befecb4bb188fd" // + "5776926c49a3095eb108fd1098baec70aaa66999a72a82f27d848b21d4a741b0" // + "c5cd4d5fff9dac89aeba122961d03a757123e9870f8acf1000020887891429ca" // + "2a3e7a7d7df7b10355165c8b9a6d0a7de8b062c4500dc4cd120c0f7418dae3d0" // + "b5781c34803fa75421c790dfe1de1834f280d7667b327f6c8cd7557e12ac3a0f" // + "93ec05c52e0493ef31a12d3d9260f79a289d6a379bc70c50841473d1a8cc81ec" // + "583e9645e07b8d9670655ba5bbcfecc6dc3966380ad8fecb17b6ba02469a020a" // + "84e18e8f84252070c13e9f1f289be54fbc481457778f616015e1327a02b140f1" // + "505eb309326d68378f8374595c849d84f4c333ec4423885143cb47bd71c5edae" // + "9be69a2ffeceb1bec9de244fbe15992b11b77c040f12bd8f6a975a44a0f90c29" // + "a9abc3d4d893927284c58754cce294529f8614dcd2aba991925fedc4ae74ffac" // + "6e333b93eb4aff0479da9a410e4450e0dd7ae4c6e2910900575da401fc07059f" // + "645e8b7e9bfdef33943054ff84011493c27b3429eaedb4ed5376441a77ed4385" // + "1ad77f16f541dfd269d50d6a5f14fb0aab1cbb4c1550be97f7ab4066193c4caa" // + "773dad38014bd2092fa755c824bb5e54c4f36ffda9fcea70b9c6e693e148c151"; CkCrypt2 crypt = new CkCrypt2(); crypt.put_CryptAlgorithm("aes"); crypt.put_CipherMode("xts"); crypt.put_KeyLength(256); crypt.SetEncodedKey(key,"hex"); crypt.XtsSetEncodedTweakKey(tweakKey,"hex"); // Here we set the tweak value as a data unit number (a 64-bit integer passed in 2 32-bit values) crypt.XtsSetDataUnitNumber(255,0); // In-place encrypt the contents of bd. success = crypt.EncryptBd(bd); Log.i(TAG, "CT = " + bd.getEncoded("hexlower")); // Decrypt to revert back to the unencrypted content: success = crypt.DecryptBd(bd); Log.i(TAG, "PT = " + bd.getEncoded("hexlower")); } static { System.loadLibrary("chilkat"); // Note: If the incorrect library name is passed to System.loadLibrary, // then you will see the following error message at application startup: //"The application <your-application-name> has stopped unexpectedly. Please try again." } } |
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