pkcs#7 - w3toppers.com

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 … Read more

How to add/remove PKCS7 padding from an AES encrypted string?

Let’s see. PKCS #7 is described in RFC 5652 (Cryptographic Message Syntax). The padding scheme itself is given in section 6.3. Content-encryption Process. It essentially says: append that many bytes as needed to fill the given block size (but at least one), and each of them should have the padding length as value. Thus, looking … Read more