export { verifyDkim, prepareEmailForVerification, fetchPublicKeyFromDNS };
/**
 * Verify DKIM signature on the given email.
 */
declare function verifyDkim(email: string): Promise<void>;
/**
 * Given an email string, extracts email header and body in their
 * canonicalized form and parses the DKIM configuration from the header.
 */
declare function prepareEmailForVerification(email: string): {
    canonicalHeader: string;
    canonicalBody: string;
    canonicalDkimHeader: string;
    dkimHeader: {
        signAlgo: "rsa" | "ed25519";
        hashAlgo: "sha256" | "sha1";
        headerCanon: "simple" | "relaxed";
        bodyCanon: "simple" | "relaxed";
        signingDomain: string;
        selector: string;
        bodyHashSpec: {
            algo: "sha256" | "sha1";
            maxBodyLength: number | undefined;
        };
        bodyHash: string;
        headerFields: string[];
        signature: string;
    };
};
declare function fetchPublicKeyFromDNS({ selector, signingDomain, }: {
    selector: string;
    signingDomain: string;
}): Promise<{
    publicKey: CryptoKey;
    publicKeyBytesDer: Uint8Array<ArrayBuffer>;
    modulusLength: number;
}>;