javax.crypto – IT Nursery

Given final block not properly padded

April 8, 2022 by IT Nursery

If you try to decrypt PKCS5-padded data with the wrong key, and then unpad it (which is done by the Cipher class automatically), you most likely will get the BadPaddingException (with probably of slightly less than 255/256, around 99.61%), because the padding has a special structure which is validated during unpad and very few keys … Read more

How can I list the available Cipher algorithms?

April 6, 2022 by IT Nursery

Once I have a list of providers, as described in JB Nizet’s post, I still don’t have a list of algorithms. I found that each Provider functions as a Properties object, and the Properties encode the algorithm names. I’m not entirely clear on if this is the correct way to look for them or not, … Read more