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    <p>We use this little helper class for password-based DES encryption from String to Hex String and back - not sure how to get this working with 3DES though:</p> <pre><code>import java.security.spec.KeySpec; import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.PBEKeySpec; import javax.crypto.spec.PBEParameterSpec; public class DesHelper { private static org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(DesHelper.class); static final byte[] SALT = { (byte) 0x09, /* snip - randomly chosen but static salt*/ }; static final int ITERATIONS = 11; private Cipher _ecipher; private Cipher _dcipher; public DesHelper(final String passphrase) { try { final PBEParameterSpec params = new PBEParameterSpec(SALT, ITERATIONS); final KeySpec keySpec = new PBEKeySpec(passphrase.toCharArray()); final SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES") .generateSecret(keySpec); _ecipher = Cipher.getInstance(key.getAlgorithm()); _dcipher = Cipher.getInstance(key.getAlgorithm()); _ecipher.init(Cipher.ENCRYPT_MODE, key, params); _dcipher.init(Cipher.DECRYPT_MODE, key, params); } catch (final Exception e) { throw new RuntimeException(e); } } public String encrypt(final String string) { try { // Encode the string into bytes using utf-8 final byte[] bytes = string.getBytes("UTF-8"); // Encrypt final byte[] enc = _ecipher.doFinal(bytes); // Encode bytes to base64 to get a string return bytesToHex(enc); } catch (final Exception e) { throw new RuntimeException(e); } } public String decrypt(final String str) { try { // Decode base64 to get bytes final byte[] dec = hexToBytes(str); // Decrypt final byte[] utf8 = _dcipher.doFinal(dec); // Decode using utf-8 return new String(utf8, "UTF8"); } catch (final Exception e) { log.info("decrypting string failed: " + str + " (" + e.getMessage() + ")"); return null; } } private static String bytesToHex(final byte[] bytes) { final StringBuilder buf = new StringBuilder(bytes.length * 2); for (final byte b : bytes) { final String hex = Integer.toHexString(0xff &amp; b); if (hex.length() == 1) { buf.append("0"); } buf.append(hex); } return buf.toString(); } private static byte[] hexToBytes(final String hex) { final byte[] bytes = new byte[hex.length() / 2]; for (int i = 0; i &lt; bytes.length; i++) { bytes[i] = (byte) Integer.parseInt(hex.substring(i * 2, i * 2 + 2), 16); } return bytes; } } </code></pre> <p>You would use this class like this:</p> <pre><code>public static void main(final String[] args) { final DesHelper h = new DesHelper("blabla"); System.out.println(h.decrypt(h.encrypt("foobar"))); } </code></pre>
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    1. POHow do I encrypt/decrypt a string of text using 3DES in java?
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