EVP_AEAD_MAX_TAG_LENGTH
unsigned char out[BUF_MAX + EVP_AEAD_MAX_TAG_LENGTH], out2[BUF_MAX];
unsigned char out[BUF_MAX + EVP_AEAD_MAX_TAG_LENGTH];
unsigned char in[BUF_MAX], out[BUF_MAX + EVP_AEAD_MAX_TAG_LENGTH];