Crypt/Base: more fixes to pre 5.4.0 padding adjustments
Crypt/Base: more fixes to pre 5.4.0 padding adjustments

kenichiii/phpseclib,creatuity/phpseclib,creatuity/phpseclib,paragonie-scott/phpseclib,splitice/phpseclib,thaigialai1987/phpseclib,terrafrost/phpseclib,metaclassing/phpseclib,phpseclib/phpseclib,thaigialai1987/phpseclib,paragonie-scott/phpseclib,danog/phpseclib,melya/phpseclib,kenichiii/phpseclib,melya/phpseclib,danog/phpseclib,metaclassing/phpseclib,splitice/phpseclib