pysmime.core: Core functions to verify, sign, encrypt and decrypt SMIME data,
build just on top of M2Crypto library wrapper to OpenSSL.
pysmime.file: Functions to verify, sign, encrypt and decrypt SMIME files, build
on top of pysmime/core.
pysmime.mail: Functions to verify, sign, encrypt and decrypt SMIME mail entity,
build on top of pysmime/core.
pysmime.pkcs11: Interact with OpenSSL by M2Crypto library wrapper and OpenSC pkcs11
engine to access smart cards and retrieve private keys and
certificates reference.