0941e7b012
AES-GMAC is equivalent to encrypting with AES-GCM an empty plaintext, using passing the data to authenticate as additional data. AES-GMAC is supported by keymaster and BouncyCastle. keymaster has fixed nonce sizes and tag sizes (128-bits). BouncyCastle has a fixed tag size (128-bit) when used through the JCE interface. NOKEYCHECK=True PiperOrigin-RevId: 257385648 GitOrigin-RevId: d6947fd3604ca782078b7a02bab2a95160df2501