Struct DkimHeader 

pub struct DkimHeader {

    pub version: u32,
    pub algorithm: Algorithm,
    pub signature_b64: String,
    pub body_hash_b64: String,
    pub canon_header: Canon,
    pub canon_body: Canon,
    pub domain: String,
    pub selector: String,
    pub signed_headers: Vec<String>,
    pub body_length: Option<u64>,
    pub timestamp: Option<u64>,
    pub expiration: Option<u64>,
    pub identity: Option<String>,
    pub query_method: String,
}

Parsed DKIM-Signature header. Borrows the b= (signature) and bh= (body hash) base64 strings + the signed-header list etc. Owned String is used for tag values that we may need to case-fold or massage during verify (e.g. signed-header names get lowercased for relaxed canon).

Fields

version: u32

v= — version (must be “1” per RFC 6376).

algorithm: Algorithm

a= — signature algorithm.

signature_b64: String

b= — base64-encoded signature bytes.

body_hash_b64: String

bh= — base64-encoded body hash.

canon_header: Canon

c= — (header_canon, body_canon) tuple. Default (Simple, Simple) per spec.

canon_body: Canon

see Self::canon_header.

domain: String

d= — signing domain (used in the selector DNS lookup).

selector: String

s= — selector (used in <s>._domainkey.<d> TXT lookup).

signed_headers: Vec<String>

h= — colon-separated list of signed header names, in the order they were signed. Lowercased and trimmed in parse so verifier doesn’t have to.

body_length: Option<u64>

l= — optional body length limit. Some signers sign only the first N bytes of the body to allow trailing additions.

timestamp: Option<u64>

t= — optional signature timestamp (seconds since epoch).

expiration: Option<u64>

x= — optional expiry (seconds since epoch). Verifier checks now > x → expired.

identity: Option<String>

i= — optional identity (used for DMARC alignment but not for hash inputs).

query_method: String

q= — query method (default “dns/txt”). We only support “dns/txt”; anything else → UnsupportedAlgorithm.

Implementations

impl DkimHeader

pub fn parse(value: &str) -> Result<Self, DkimError>

Parse a single DKIM-Signature: header value. Caller has already stripped the DKIM-Signature: prefix; this function expects the VALUE portion (everything after the first :).

The header may contain folded continuation lines (CRLF + WSP); we unfold internally before parsing tags.

Trait Implementations

impl Clone for DkimHeader

fn clone(&self) -> DkimHeader

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DkimHeader

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

Formats the value using the given formatter.