AES/CBC/PKCS5Padding vs AES/CBC/PKCS7Padding with 256 key size performance java
The block size is a property of the used cipher algorithm. For AES it is always 16 bytes.
So strictly speaking, PKCS5Padding cannot be used with AES since it is defined only for a block size of 8 bytes. I assume, AES/CBC/PKCS5Padding is interpreted as AES/CBC/PKCS7Padding internally.
The only difference between these padding schemes is that PKCS7Padding has the block size as a parameter, while for PKCS5Padding it is fixed at 8 bytes. When the Block size is 8 bytes they do exactly the same.