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copied!<p>I had hard times figuring it out myself and this post helped me to find the right answer for my case. When working with financial messaging as ISO-8583 the 3DES requirements are quite specific, so for my especial case the "DESede/CBC/PKCS5Padding" combinations wasn't solving the problem. After some comparative testing of my results against some 3DES calculators designed for the financial world I found the the value "DESede/ECB/Nopadding" is more suited for the the specific task.</p> <p>Here is a demo implementation of my TripleDes class (using the Bouncy Castle provider)</p> <pre><code> import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.security.NoSuchProviderException; import java.security.Security; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.NoSuchPaddingException; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; import org.bouncycastle.jce.provider.BouncyCastleProvider; /** * * @author Jose Luis Montes de Oca */ public class TripleDesCipher { private static String TRIPLE_DES_TRANSFORMATION = "DESede/ECB/Nopadding"; private static String ALGORITHM = "DESede"; private static String BOUNCY_CASTLE_PROVIDER = "BC"; private Cipher encrypter; private Cipher decrypter; public TripleDesCipher(byte[] key) throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException { Security.addProvider(new BouncyCastleProvider()); SecretKey keySpec = new SecretKeySpec(key, ALGORITHM); encrypter = Cipher.getInstance(TRIPLE_DES_TRANSFORMATION, BOUNCY_CASTLE_PROVIDER); encrypter.init(Cipher.ENCRYPT_MODE, keySpec); decrypter = Cipher.getInstance(TRIPLE_DES_TRANSFORMATION, BOUNCY_CASTLE_PROVIDER); decrypter.init(Cipher.DECRYPT_MODE, keySpec); } public byte[] encode(byte[] input) throws IllegalBlockSizeException, BadPaddingException { return encrypter.doFinal(input); } public byte[] decode(byte[] input) throws IllegalBlockSizeException, BadPaddingException { return decrypter.doFinal(input); } } </code></pre>

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