56-bit DES Encryption, ECB, CBC modes

56-bit DES encryption. The Chilkat encryption component supports DES in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) cipher modes.

Download Chilkat Java Library

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[])
  {
    CkCrypt2 crypt = new CkCrypt2();

    boolean success;
    success = crypt.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        System.out.println("Crypt component unlock failed");
        return;
    }

    //  Specify DES for the encryption algorithm:
    crypt.put_CryptAlgorithm("des");

    //  CipherMode may be "ecb" or "cbc"
    crypt.put_CipherMode("cbc");

    //  KeyLength must be 64.  DES is technically 56-bits;
    //  the most-significant bit of each key byte is a parity bit,
    //  so we must indicate a KeyLength of 64, which includes
    //  the parity bits.
    crypt.put_KeyLength(64);

    //  The padding scheme determines the contents of the bytes
    //  that are added to pad the result to a multiple of the
    //  encryption algorithm's block size.  DES has a block
    //  size of 8 bytes, so encrypted output is always
    //  a multiple of 8.
    crypt.put_PaddingScheme(0);

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

    //  An initialization vector is required if using CBC or CFB modes.
    //  ECB mode does not use an IV.
    //  The length of the IV is equal to the algorithm's block size.
    //  It is NOT equal to the length of the key.
    String ivHex;
    ivHex = "0001020304050607";
    crypt.SetEncodedIV(ivHex,"hex");

    //  The secret key must equal the size of the key.  For
    //  DES, the key must be 8 bytes (i.e. 64-bits).
    String keyHex;
    keyHex = "0001020304050607";
    crypt.SetEncodedKey(keyHex,"hex");

    //  Encrypt a string...
    //  The input string is 44 ANSI characters (i.e. 44 bytes), so
    //  the output should be 48 bytes (a multiple of 8).
    //  Because the output is a hex string, it should
    //  be 96 characters long (2 chars per byte).
    String encStr;
    encStr = crypt.encryptStringENC("The quick brown fox jumps over the lazy dog.");
    System.out.println(encStr);

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