Required passlib >=1.7.0
From https://discuss.tryton.org/t/error-while-installation-cryptcontext-object-has-no-attribute/3264, we use Context.hash method which was added only in 1.7.0.
From https://discuss.tryton.org/t/error-while-installation-cryptcontext-object-has-no-attribute/3264, we use Context.hash method which was added only in 1.7.0.