kbkdf 0.0.1

Key Derivation Using Pseudorandom Function (KBKDF)
Documentation 
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use digest::{
    array::typenum::Unsigned,
    consts::{U16, U24, U32, U8},
};

mod private {
    use digest::consts::{U16, U24, U32, U8};

    pub trait Sealed {}

    impl Sealed for U8 {}
    impl Sealed for U16 {}
    impl Sealed for U24 {}
    impl Sealed for U32 {}
}

/// Marker used to register valid values for R in the KBKDF
pub trait R: Unsigned + private::Sealed {}

impl R for U8 {}
impl R for U16 {}
impl R for U24 {}
impl R for U32 {}