Results 1 issues of Musa Ünal

This PR implements the remaining TODOs from the closed PR https://github.com/openssl/openssl/pull/16323. *Original PR author*: @ntauth *Original PR description*: This PR refers to issue #16230 (ossl_cipher_unpadblock is not constant-time). Before this...

branch: master
approval: review pending
approval: otc review pending
triaged: feature
severity: fips change
tests: exempted
severity: ABI change