pycryptodomex; python_version < '2.7'
cryptography; python_version == '2.7'
pycryptodomex; python_version == '3.0'
pycryptodomex; python_version == '3.1'
pycryptodomex; python_version == '3.2'
pycryptodomex; python_version == '3.3'
cryptography; python_version >= '3.4'
