import type { SSHKeyPair } from "./types.js";
/**
 * Generate an Ed25519 SSH key pair.
 */
export declare function generateSSHKeyPair(): SSHKeyPair;
/**
 * Parse a public key string and return its algorithm and fingerprint.
 */
export declare function parsePublicKey(key: string): {
    algorithm: string;
    fingerprint: string;
};
/**
 * Calculate the SHA256 fingerprint of a public key (base64 encoded).
 */
export declare function calculateFingerprint(publicKey: string): string;
/**
 * Format a public key as an authorized_keys entry with an optional comment.
 */
export declare function formatAuthorizedKey(publicKey: string, comment?: string): string;
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