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@lacspace/dkim

v1.0.0Mail Kit0 deps

DKIM signing and verification for email: RFC 6376 (rsa-sha256, simple/relaxed canonicalization, l=, x=, t=, oversigned From), RFC 8463 Ed25519 (ed25519-sha256) and RFC 8301 (rsa-sha1 and keys under 1024 bits rejected). signMessage(), verifyMessage() with multiple signatures, From alignment, revoked/missing keys and injectable DNS. Key generation and ready-to-paste DNS TXT records split into 255-character strings. Pure WebCrypto, zero dependencies, isomorphic.

npm i @lacspace/dkim
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Usage

dkim.ts
import { signMessage, verifyMessage, generateKeyPair } from "@lacspace/dkim";

const signed = await signMessage(rawMime, {
  domain: "example.com",
  selector: "mail2026",
  privateKey: process.env.DKIM_PRIVATE_KEY!, // PKCS#8 PEM
});
// "DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=example.com; s=mail2026; t=…;\r\n h=from:to:subject:date:message-id:from; bh=…; b=…\r\n" + rawMime

const { pass, results } = await verifyMessage(incomingRaw);
// pass: true when at least one signature verifies AND its d= aligns with the From domain
// results: [{ domain: "example.com", selector: "mail2026", algorithm: "rsa-sha256", status: "pass",
//             aligned: true, canonicalization: "relaxed/relaxed", signedHeaders: [...], bodyHashOk: true, keyBits: 2048 }]

Exports 18

DEFAULT_SIGNED_HEADERSDkimErrorcanonicalizeBodycanonicalizeHeaderchunkTxtdkimDnsRecorded25519SeedToPkcs8fromDomainOfgenerateKeyPairimportPrivateKeyparseDkimKeyparseDkimSignatureparseTagListsignHeadersignMessagestripSignatureValuetoPemverifyMessage

Keywords

dkimemailmailsmtprfc6376rfc8463

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