Add Rsassa-Pss / PKCS#1 v2 Signature via usage of phpseclib#222

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7118path wants to merge 4 commits intorobrichards:masterfrom 7118path:rsassa-pss

+275-83

Commits on Dec 9, 2020

working with phpSecLib for rsassa-pss sign and verify first steps
Tobias Assmann
committed

Commits on Dec 10, 2020

add RsassaPss sha2 based algorithms using phpSecLib instead of php openssl extension
Tobias Assmann
committed

Commits on Dec 11, 2020

fix autoload require, as dep is not found in local vendor dir if lib is used in composer context
Tobias Assmann
committed

Commits on Mar 2, 2021

docs: update readme
Tobias Assmann
committed