Cargo Features

[dependencies]
sm3 = { version = "0.5.0-pre.4", default-features = false, features = ["std", "zeroize"] }
default = std

The std feature is set by default whenever sm3 is added without default-features = false somewhere in the dependency tree.

std default

Enables std of digest

zeroize

Enables zeroize of digest

SM3 has 3 features without comments.