EVP_aes_256_gcm
EVP_add_cipher(EVP_aes_256_gcm());
const EVP_CIPHER *EVP_aes_256_gcm(void);
EVP_add_cipher(EVP_aes_256_gcm());
16, 32, 12, 16, 0, EVP_aes_256_gcm },
ok = EVP_EncryptInit_ex(ioq->ctx, EVP_aes_256_gcm(), NULL,
ok = EVP_DecryptInit_ex(ioq->ctx, EVP_aes_256_gcm(), NULL,