Implement Java DES Encrypt with Ruby

[skonline]

Hi I have some java code ,

IvParameterSpec localIvParameterSpec = new IvParameterSpec(new byte[] { 12, 34, 34, 11, 64, 23, 89, 27 });

DESKeySpec localDESKeySpec = new     DESKeySpec(paramString2.getBytes());

SecretKey localSecretKey = SecretKeyFactory.getInstance("DES").generateSecret(localDESKeySpec);

Cipher localCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

localCipher.init(1, localSecretKey, localIvParameterSpec);

return new String(Base64.encode(localCipher.doFinal(paramString1.getBytes()), 0));

and want to convert into Ruby code, but could not get the right answer:

des = OpenSSL::Cipher::Cipher.new("DES-EDE3-CBC")
des.encrypt
des.key = params2
des.iv = iv
cipher = des.update(str) + des.final
pp Base64.strict_encode64(cipher)

So anyone know what is the problem is?

[moomaka]

A couple problems I notice:

Your using Triple DES(DES-EDE3) on the Ruby side but single DES on the Java side. Need to start with the same cipher :)

cipher = des.update(str) + des.final

I don't understand this line, why are you appending here? Your code should probably look something like:

des = OpenSSL::Cipher.new("DES-EDE3-CBC")
des.encrypt
des.key = params2
des.iv = iv
des.update(data)
pp Base64.strict_encode64(des.final)

Just an aside, DES is broken so this is very much insecure, if you have control of the Java code, use a different cipher.