/**
 * DOCX Font Obfuscation (ODTTF format)
 *
 * Per ECMA-376 Part 3, Section 4, embedded TrueType fonts may be obfuscated by
 * XOR-ing the first 32 bytes of the font file with a 16-byte GUID repeated twice.
 *
 * The GUID in the w:fontKey attribute is in the form "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}"
 * but bytes are applied in a specific order derived from the GUID.
 */
/**
 * Deobfuscate ODTTF font data to raw TTF/OTF.
 *
 * @param data - The obfuscated font data (first 32 bytes are obfuscated).
 * @param fontKey - The GUID from w:fontKey attribute.
 * @returns The deobfuscated font data (new buffer).
 */
export declare function deobfuscateFont(data: Uint8Array, fontKey: string): Uint8Array;
/**
 * Obfuscate a raw TTF/OTF font to ODTTF format.
 *
 * @param data - The raw font data.
 * @param fontKey - The GUID to use for obfuscation (also stored in w:fontKey).
 * @returns The obfuscated font data (new buffer).
 */
export declare function obfuscateFont(data: Uint8Array, fontKey: string): Uint8Array;
/**
 * Generate a new random GUID suitable for w:fontKey.
 *
 * @returns A GUID string in the form "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}"
 */
export declare function generateFontKey(): string;