Error decrypting with Java Cipher

Question

My program encrypts properly, but while decrypting I get this error:
Error Input length (with padding) not multiple of 8 bytes
Any idea??? Please, HELP!
protected byte[] decrypt(byte[] buffer,char[] passwd)
         byte[] salt={(byte)0xd4,(byte)0xa3,(byte)0xff,(byte)0x9e,(byte)0x12,(byte)0xc7,(byte)0xd0,(byte)0x84};
         byte[] plainTxt=null;
         Cipher c=null;
         PBEParameterSpec paramSpec=null;
         SecretKey passwordKey=null;
         try
             paramSpec=new PBEParameterSpec(salt,20);
             PBEKeySpec keySpec=new PBEKeySpec(passwd);
             SecretKeyFactory kf=SecretKeyFactory.getInstance("PBEWithMD5AndDES");
             passwordKey=kf.generateSecret(keySpec);
             c=Cipher.getInstance("PBEWithMD5AndDES");
             c.init(Cipher.DECRYPT_MODE, passwordKey, paramSpec);
             plainTxt=c.doFinal(buffer);  
         catch (Exception e)
             System.out.println("Error "+ e.getMessage());
             System.exit(0);
         return plainTxt;
    }

Answer 1

Below is the test harness I wrapped round your code and for me it works without the errors you say you get!
Your code could be made much more rugged and efficient but it works.
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.*;
import java.security.spec.*;
public class Test4 {
  protected byte[] decrypt(byte[] buffer,char[] passwd) {
    byte[] salt={(byte)0xd4,(byte)0xa3,(byte)0xff,(byte)0x9e,(byte)0x12,(byte)0xc7,(byte)0xd0,(byte)0x84};
    byte[] plainTxt=null;
    Cipher c=null;
    PBEParameterSpec paramSpec=null;
    SecretKey passwordKey=null;
    try {
      paramSpec=new PBEParameterSpec(salt,20);
      PBEKeySpec keySpec=new PBEKeySpec(passwd);
      SecretKeyFactory kf=SecretKeyFactory.getInstance("PBEWithMD5AndDES");
      passwordKey=kf.generateSecret(keySpec);
      c=Cipher.getInstance("PBEWithMD5AndDES");
      c.init(Cipher.DECRYPT_MODE, passwordKey, paramSpec);
      plainTxt=c.doFinal(buffer);
    } catch (Exception e) {
      System.out.println("Error "+ e.getMessage());
      System.exit(0);
    return plainTxt;
  protected byte[] encrypt(byte[] buffer,char[] passwd) {
    byte[] salt={(byte)0xd4,(byte)0xa3,(byte)0xff,(byte)0x9e,(byte)0x12,(byte)0xc7,(byte)0xd0,(byte)0x84};
    byte[] cipherTxt=new byte[buffer.length];
    Cipher c=null;
    PBEParameterSpec paramSpec=null;
    SecretKey passwordKey=null;
    try {
      paramSpec=new PBEParameterSpec(salt,20);
      PBEKeySpec keySpec=new PBEKeySpec(passwd);
      SecretKeyFactory kf=SecretKeyFactory.getInstance("PBEWithMD5AndDES");
      passwordKey=kf.generateSecret(keySpec);
      c=Cipher.getInstance("PBEWithMD5AndDES");
      c.init(Cipher.ENCRYPT_MODE,passwordKey,paramSpec);
      cipherTxt=c.doFinal(buffer);
    } catch (Exception e) {
      System.out.println("Error "+ e.getMessage());
      System.exit(0);
    return cipherTxt;
  public static void main(String[] args) {
    try {
      // Make sure SUN are a valid provider
      Security.addProvider(new com.sun.crypto.provider.SunJCE());
      char[] passphrase = "sabre150".toCharArray();
      Test4 agent = new Test4();
      // Get the dataString to encrypt from the command line
      String dataString = "The quick brown fox jumps over the lazy dog.";
      byte[] dataBytes = dataString.getBytes("UTF8");
      System.out.println("Data string ....................[" + dataString + "]");
      // Encrypt the data
      byte[] encryptedBytes = agent.encrypt(dataBytes, passphrase);
      // Decrypt the data
      byte[] recoveredDataBytes = agent.decrypt(encryptedBytes, passphrase);
      String recoveredDataString = new String(recoveredDataBytes, "UTF8");
      System.out.println("Recovered data string ..........[" + recoveredDataString + "]");    
    } catch (Exception e) {
      e.printStackTrace();
}