import * as crypto from 'crypto';
import { type SSHKey, type SSHSignature } from './ssh_agent_client.ts';
/** Read a length-prefixed string (uint32 BE length + bytes) from a buffer. */
declare const readString: (buffer: Buffer, offset: number) => Buffer;
/** Write a length-prefixed string into `target` at `offset`, return next offset. */
declare const writeString: (target: Buffer, src: Buffer, offset: number) => number;
/**
 * Write the 5-byte SSH agent frame header (4-byte length + 1-byte tag)
 * into `request` and return the next write offset (5).
 * The length field is the total buffer length minus the 4-byte length field itself.
 */
declare const writeHeader: (request: Buffer, tag: number) => number;
/** Convert an SSH public key blob to a Node.js `crypto.KeyObject`. */
declare const parseSSHPublicKey: (key: SSHKey) => crypto.KeyObject;
/** Map an SSH signature to the hash algorithm and signature bytes expected by `crypto.verify`. */
declare const parseSSHSignature: (signature: SSHSignature) => {
    algorithm: string | null;
    raw: Buffer;
};
export { readString, writeString, writeHeader, parseSSHPublicKey, parseSSHSignature };