(Java) AES OFB Output Feedback Mode Encryption

Demonstrates how to encrypt using AES OFB (Output Feedback) mode.

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 example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkCrypt2 crypt = new CkCrypt2();

    crypt.put_CryptAlgorithm("aes");
    // Set the cipher mode to Output Feedback
    crypt.put_CipherMode("ofb");
    crypt.put_KeyLength(256);

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

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

    // The secret key must equal the size of the key.  For
    // 256-bit encryption, the binary secret key is 32 bytes.
    String keyHex = "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4";
    crypt.SetEncodedKey(keyHex,"hex");

    // Encrypt a string...
    String encStr = crypt.encryptStringENC("Popular opinions, on subjects not palpable to sense, are often true, but seldom or never the whole truth. -- John Stuart Mill");
    System.out.println(encStr);

    CkCrypt2 decrypt = new CkCrypt2();
    decrypt.put_CryptAlgorithm("aes");
    decrypt.put_CipherMode("ofb");
    decrypt.put_KeyLength(256);
    decrypt.put_EncodingMode("hex");
    decrypt.SetEncodedIV(ivHex,"hex");
    decrypt.SetEncodedKey(keyHex,"hex");

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