pkcs#7

问题 I am currently using AES/CBC/PKCS5Padding for encrypting files in Java with 256 bytes key size, but while searching I found on stackexchange PKCS#5-PKCS#7 Padding and it is mentioned, PKCS#5 padding is a subset of PKCS#7 padding for 8 byte block sizes So I want to know Will the performance of AES/CBC/PKCS7Padding will be better then AES/CBC/PKCS5Padding for the above configuration? How can we configure the block size in Java as it is mentioned PKCS#7 padding would work for any block size from

问题 I\'m trying to encrypt/decrypt a string using 128 bit AES encryption (ECB). What I want to know is how I can add/remove the PKCS7 padding to it. It seems that the Mcrypt extension can take care of the encryption/decryption, but the padding has to be added/removed manually. Any ideas? 回答1: 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