Question

I have a 48 character AES-192 encryption key which I’m using to decrypt an encrypted database.

However, it tells me the key length is invalid, so I logged the results of getBytes().

When I execute:

final String string = "346a23652a46392b4d73257c67317e352e3372482177652c";
final byte[] utf32Bytes = string.getBytes("UTF-32");
System.out.println(utf32Bytes.length);

Using BlueJ on my mac (Java Virtual Machine), I get 192 as the output.

However, when I use:

Log.d(C.TAG, "Key Length: " + String.valueOf("346a23652a46392b4d73257c67317e352e3372482177652c".getBytes("UTF-32").length));

I get 196 as the output.

Does anybody know why this is happening, and where Dalvik is getting an additional 4 bytes from?

Answer 1

You should specify endianess on both machines

final byte[] utf32Bytes = string.getBytes("UTF-32BE");

Note that "UTF-32BE" is a different encoding, not special .getBytes parameter. It has fixed endianess and doesn’t need BOM. More info: http://www.unicode.org/faq/utf_bom.html#gen6