/**
 * PDF key derivation hash functions — Browser version.
 *
 * Pure JavaScript implementations for browser environments where
 * node:crypto is not available. Same API as the Node.js version.
 */
/** MD5 for PDF key derivation — ISO 32000 Algorithm 2/3/7. */
export declare function pdfMd5(input: Uint8Array): Uint8Array;
/** SHA-256 for PDF key derivation — ISO 32000 Algorithm 2.A/2.B. */
export declare function pdfSha256(input: Uint8Array): Uint8Array;