Cargo Features

[dependencies]
ktls = { version = "6.0.1", default-features = false, features = ["aws_lc_rs", "aws-lc-rs", "ring", "tls12"] }
default = aws_lc_rs, tls12

These default features are set whenever ktls is added without default-features = false somewhere in the dependency tree.

aws_lc_rs default aws-lc-rs?

Enables aws_lc_rs of rustls and tokio-rustls

aws-lc-rs = aws_lc_rs

Alias because Cargo features commonly use -

ring

Enables ring of rustls and tokio-rustls

tls12 default

Enables tls12 of rustls and tokio-rustls