/** SHA-256 on raw bytes. Returns 32-byte Uint8Array. */
export declare function sha256Bytes(data: Uint8Array): Uint8Array;
/** MD5 on raw bytes. Returns 16-byte Uint8Array. */
export declare function md5Bytes(data: Uint8Array): Uint8Array;
/**
 * HMAC per RFC 2104.
 * Returns null for unsupported algorithms.
 */
export declare function hmacBytes(algo: string, key: Uint8Array, data: Uint8Array): Uint8Array | null;
/** Convert Uint8Array to lowercase hex string. */
export declare function toHex(bytes: Uint8Array): string;
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