Java / .NET rijndael File Encryption Interop

[Ola Daniel]

I need to create a Java version of an existing .NET application which uses Xceed Encryption Library to encrypt and decrypt files. I need help on how to get a Java to encrypt and decrypt files which have been encrypted with the .NET Xceed Encryption library.


See this link here for an example of how the Xceed encryption library works: http://doc.xceedsoft.com/products/XceedCry/Encrypting_and_decrypting_from_file_to_file_%28C__example%29.html

The Xceed library creates a symmetric key using a passphrase from the user. How do I do this in Java?

I already have code which generates a random secret key, this is no good. How do I create an AES 128 bit SecretKey from a given passphrase.

Any Ideas?

[Rob Spoor]

How about using SecretKeySpec?

[Ola Daniel]

Is this correct way of doing it (see code below)? using PBEWithMD5AndDES for key factory? and MD5 hashing? Is it possible to use SHA-256 to generate a 128 bit hash?

    
String passphrase = "password";
			KeySpec keySpec = new PBEKeySpec(passphrase.toCharArray());
			
			SecretKey secretKey = SecretKeyFactory.getInstance("PBEWithMD5AndDES").
            generateSecret(keySpec);
			
			
			String algorithm = "AES";
			
			MessageDigest md = MessageDigest.getInstance("MD5");
			md.update(secretKey.getEncoded());			
			
			byte[] keyBytes = md.digest();			
			
		    SecretKeySpec key = new SecretKeySpec(keyBytes, algorithm);