Skip to main content

HashAlgorithm

embedded_cal

Trait HashAlgorithm 

Source 
pub trait HashAlgorithm:
    Sized
    + PartialEq
    + Eq
    + Debug
    + Clone {
    // Required method
    fn len(&self) -> usize;

    // Provided methods
    fn from_cose_number(number: impl Into<i128>) -> Option<Self> { ... }
    fn from_ni_id(number: u8) -> Option<Self> { ... }
    fn from_ni_name(name: &str) -> Option<Self> { ... }
}
Expand description

A hash algorithm identifier.

While const traits are not stable yet, implementers should prepare for the constructors and other methods to be const functions.

Required Methods§

Source

fn len(&self) -> usize

Output length of the hash algorithm.

Provided Methods§

Source

fn from_cose_number(number: impl Into<i128>) -> Option<Self>

Selects a hash algorithm from its COSE number.

The algorithm number comes from the “COSE Algorithms” registry maintained by IANA.

This works from Into<i128> because the numeric range of CBOR integers is effectively that of a i65 (the sign is in the data type); inlining will take care of systems not actually materializing any i128 comparisons, let alone arithmetic.

Source

fn from_ni_id(number: u8) -> Option<Self>

Selects a hash algorithm from a Suite ID out of the IANA Named Information Hash Algorith Registry

https://www.iana.org/assignments/named-information/named-information.xhtml#hash-alg

Note that while the number is expressed as a u8, the actual usable value space is 0..=63 excluding the reserved 32; implementations must return None for values outside this range.

Source

fn from_ni_name(name: &str) -> Option<Self>

Selects a hash algorithm from a Hash Name String out of the IANA Named Information Hash Algorith Registry

https://www.iana.org/assignments/named-information/named-information.xhtml#hash-alg

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§