(Java) Encrypt / Decrypt a File and Verify it has not Changed

Demonstrates how to encrypt and decrypt a file, and verify it has not changed.

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

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

    boolean success;
    CkCrypt2 crypt = new CkCrypt2();

    crypt.put_CryptAlgorithm("aes");
    crypt.put_CipherMode("cbc");
    crypt.put_KeyLength(128);
    crypt.put_PaddingScheme(0);

    String ivHex = "000102030405060708090A0B0C0D0E0F";
    crypt.SetEncodedIV(ivHex,"hex");

    String keyHex = "00010203040506071011121314151617";
    crypt.SetEncodedKey(keyHex,"hex");

    String dataFile = "qa_data/zips/HBIQ040615300005.ZIP";
    String outFile = "qa_output/HBIQ040615300005.enc";
    String outFile2 = "qa_output/HBIQ040615300005.ZIP";

    success = crypt.CkEncryptFile(dataFile,outFile);
    success = crypt.CkDecryptFile(outFile,outFile2);

    CkFileAccess fac = new CkFileAccess();
    boolean bEqual = fac.FileContentsEqual(dataFile,outFile2);
    if (bEqual != true) {
        System.out.println("Decrypted file not equal to the original.");
        }
    else {
        System.out.println("Success.");
        }
  }
}