/usr/src/kernels/4.18.0-553.121.1.el8_10.x86_64/include/crypto
Edit: /usr/src/kernels/4.18.0-553.121.1.el8_10.x86_64/include/crypto/gcm.h (140B)
#ifndef _CRYPTO_GCM_H
#define _CRYPTO_GCM_H
#define GCM_AES_IV_SIZE 12
#define GCM_RFC4106_IV_SIZE 8
#define GCM_RFC4543_IV_SIZE 8
#endif