/**
 * HTTP Message Signature verification.
 *
 * Runtime-neutral verification using SignatureVerifier function type.
 * WebCrypto is used internally but NOT exposed in public API.
 */
import { SignatureVerifier, SignatureRequest, VerifyOptions, VerificationResult, ParsedSignatureParams } from './types.js';
/**
 * Verify an HTTP Message Signature.
 *
 * @param request - Request data with headers
 * @param options - Verification options including key resolver
 * @returns Verification result
 */
export declare function verifySignature(request: SignatureRequest, options: VerifyOptions): Promise<VerificationResult>;
/**
 * Check if signature is expired.
 *
 * @param params - Parsed signature parameters
 * @param now - Current Unix timestamp (defaults to current time)
 * @returns true if signature is expired
 */
export declare function isExpired(params: ParsedSignatureParams, now?: number): boolean;
/**
 * Check if signature was created in the future (accounting for clock skew).
 *
 * @param params - Parsed signature parameters
 * @param now - Current Unix timestamp (defaults to current time)
 * @param skewSeconds - Allowed clock skew in seconds (defaults to 60)
 * @returns true if signature is from the future
 */
export declare function isCreatedInFuture(params: ParsedSignatureParams, now?: number, skewSeconds?: number): boolean;
/**
 * Check if Ed25519 WebCrypto is supported in current runtime.
 *
 * @returns true if Ed25519 WebCrypto is available
 */
export declare function isEd25519WebCryptoSupported(): Promise<boolean>;
/**
 * Create a SignatureVerifier from a WebCrypto CryptoKey.
 *
 * This is a helper for consumers who have CryptoKey objects.
 * The function is runtime-neutral as it accepts unknown and casts internally.
 *
 * @param key - WebCrypto CryptoKey (passed as unknown for runtime neutrality)
 * @returns SignatureVerifier function
 */
export declare function createWebCryptoVerifier(key: unknown): SignatureVerifier;
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