/**
 * PGP Key Export
 *
 * Export PKCS8 private keys to OpenPGP armored format.
 * Compatible with GPG and GitHub.
 *
 * This module converts existing PKCS8 key material to OpenPGP format,
 * preserving the original cryptographic material rather than generating
 * new keys.
 *
 * Issue #1374
 */
/**
 * Options for exporting a PGP key
 */
export interface ExportPGPKeyOptions {
    /** Optional passphrase to encrypt the exported key */
    passphrase?: string;
    /** User IDs to associate with the key */
    userIds?: Array<{
        name?: string;
        email?: string;
    }>;
    /** Key creation date (defaults to current time) */
    date?: Date;
}
/**
 * Result of exporting a PGP key
 */
export interface ExportedPGPKey {
    /** Armored private key in OpenPGP format */
    armoredPrivateKey: string;
    /** Armored public key in OpenPGP format */
    armoredPublicKey: string;
    /** Whether the exported private key is encrypted */
    isEncrypted: boolean;
    /** Key fingerprint (SHA-256 of SPKI bytes, first 40 hex chars) */
    fingerprint: string;
}
/**
 * Error thrown when key export fails
 */
export declare class PGPKeyExportError extends Error {
    readonly code: string;
    constructor(message: string, code: string);
}
/**
 * Export a PKCS8 private key to OpenPGP armored format
 *
 * This function converts existing PKCS8 RSA key material to OpenPGP format,
 * preserving the original cryptographic material. The exported key can be
 * used with GPG, GitHub, and other OpenPGP-compatible tools.
 *
 * @param privateKeyBytes - PKCS8 encoded private key bytes
 * @param options - Export options (passphrase, userIds, date)
 * @returns Armored private and public keys with fingerprint
 * @throws PGPKeyExportError if export fails
 */
export declare function exportPGPKeyToArmored(privateKeyBytes: Uint8Array, options?: ExportPGPKeyOptions): Promise<ExportedPGPKey>;