/**
 * SHA-256 hash of arbitrary bytes.
 * Returns raw 32-byte Uint8Array.
 */
export declare function sha256Bytes(input: Uint8Array): Uint8Array;
export declare function sha256Hex(input: string): string;
/**
 * Normalize content to Uint8Array then hash it.
 * Strings are UTF-8 encoded before hashing.
 */
export declare function hashContent(content: Uint8Array | string): Uint8Array;
/**
 * Encode raw bytes to base64.
 * Kept here so hash.ts is self-contained for its callers.
 */
export declare function bytesToBase64(bytes: Uint8Array): string;
/**
 * Decode base64 to raw bytes.
 */
export declare function base64ToBytes(b64: string): Uint8Array;
export declare function bytesToHex(bytes: Uint8Array): string;