Enum Algorithm 

#[repr(u8)]
pub enum Algorithm {
    RsaSha1 = 0,
    RsaSha256 = 1,
    Ed25519Sha256 = 2,
    MlDsa44Ed25519Sha512 = 3,
}

A signature algorithm, as named in the a= tag of DKIM (RFC 6376 Section 3.5) and ARC signatures and in the s= tag of DKIM2 signatures.

Variants

RsaSha1 = 0

rsa-sha1 (RFC 6376 Section 3.3.1). This crate only verifies it; RFC 8301 deprecates it for both signing and verifying.

RsaSha256 = 1

rsa-sha256 (RFC 6376 Section 3.3.2). This is the default.

Ed25519Sha256 = 2

ed25519-sha256 (RFC 8463).

MlDsa44Ed25519Sha512 = 3

mldsa44-ed25519-sha512: the composite of ML-DSA-44 (FIPS 204) and Ed25519 (RFC 8032) defined as id-MLDSA44-Ed25519-SHA512 by draft-ietf-lamps-pq-composite-sigs, with an empty application context. The composite message M is the DKIM2 signature input (draft-ietf-dkim-dkim2-spec Section 12.8), so its SHA-512 pre-hash is the only SHA-512 computation. DKIM2 only.

Implementations

impl Algorithm

pub fn parse(name: &[u8]) -> Option<Self>

Parses a DKIM or ARC algorithm name (rsa-sha1, rsa-sha256 or ed25519-sha256), ignoring ASCII case. Returns None for any other name, including the DKIM2-only mldsa44-ed25519-sha512.

pub fn parse_dkim2(name: &[u8]) -> Option<Self>

Parses a DKIM2 signature algorithm name (rsa-sha256, ed25519-sha256 or mldsa44-ed25519-sha512). Names are case-sensitive (draft-ietf-dkim-dkim2-spec Section 2.14), and rsa-sha1 is not a DKIM2 algorithm.

pub fn name(&self) -> &'static str

Returns the lowercase algorithm name used in the a= or s= tag.

Trait Implementations

impl Clone for Algorithm

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Algorithm

impl Debug for Algorithm

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Algorithm

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Algorithm

impl From<Algorithm> for HashAlgorithm

fn from(a: Algorithm) -> Self

Converts to this type from the input type.

impl PartialEq for Algorithm

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Algorithm