Function sign 

pub fn sign(key: &Key, data: &[u8]) -> Result<Tag, Unspecified>

Available on crate feature crypto only.

Calculates the CMAC of data using the key key in one step.

Use Context to calculate CMACs where the input is in multiple parts.

It is generally not safe to implement CMAC verification by comparing the return value of sign to a tag. Use verify for verification instead.

Errors

error::Unspecified if the CMAC calculation fails.