OVPN_NONCE_SIZE
if (crypto_aead_ivsize(aead) != OVPN_NONCE_SIZE) {
pr_err("%s IV size must be %d\n", title, OVPN_NONCE_SIZE);
unsigned int len = OVPN_NONCE_SIZE;
DEBUG_NET_WARN_ON_ONCE(crypto_aead_ivsize(tfm) != OVPN_NONCE_SIZE);
BUILD_BUG_ON(4 + OVPN_NONCE_TAIL_SIZE != OVPN_NONCE_SIZE);
#define OVPN_NONCE_WIRE_SIZE (OVPN_NONCE_SIZE - OVPN_NONCE_TAIL_SIZE)