+always_inline void
+wg_prepare_sync_op (vlib_main_t *vm, vnet_crypto_op_t **crypto_ops, u8 *src,
+ u32 src_len, u8 *dst, u8 *aad, u32 aad_len, u64 nonce,
+ vnet_crypto_op_id_t op_id,
+ vnet_crypto_key_index_t key_index, u32 bi, u8 *iv)
+{
+ vnet_crypto_op_t _op, *op = &_op;
+ u8 src_[] = {};
+
+ clib_memset (iv, 0, 4);
+ clib_memcpy (iv + 4, &nonce, sizeof (nonce));
+
+ vec_add2_aligned (crypto_ops[0], op, 1, CLIB_CACHE_LINE_BYTES);
+ vnet_crypto_op_init (op, op_id);
+
+ op->tag_len = NOISE_AUTHTAG_LEN;
+ if (op_id == VNET_CRYPTO_OP_CHACHA20_POLY1305_DEC)
+ {
+ op->tag = src + src_len;
+ op->flags |= VNET_CRYPTO_OP_FLAG_HMAC_CHECK;
+ }
+ else
+ op->tag = dst + src_len;
+
+ op->src = !src ? src_ : src;
+ op->len = src_len;
+
+ op->dst = dst;
+ op->key_index = key_index;
+ op->aad = aad;
+ op->aad_len = aad_len;
+ op->iv = iv;
+ op->user_data = bi;
+}
+