Cargo Features

[dependencies]
md2 = { version = "0.10.2", default-features = false, features = ["std", "oid"] }
default = std

The std feature is set by default whenever md2 is added without default-features = false somewhere in the dependency tree.

std default

Enables std of digest

oid

Enables oid of digest

MD2 has 3 features without comments.