import type { PKCECodePair } from './types.js';
/**
 * Generate a random code verifier for PKCE (RFC 7636)
 * Returns base64url-encoded string of 32-96 random bytes
 */
export declare function generateCodeVerifier(): string;
/**
 * Generate code challenge from verifier using S256 method
 * S256 = SHA256(code_verifier) encoded as base64url
 */
export declare function generateCodeChallenge(verifier: string): string;
/**
 * Generate PKCE code pair (verifier + challenge)
 */
export declare function generatePKCECodePair(): PKCECodePair;
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