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diff --git a/src/plugins/wireguard/wireguard_chachapoly.h b/src/plugins/wireguard/wireguard_chachapoly.h
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+/*
+ * Copyright (c) 2022 Rubicon Communications, LLC.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __included_wg_chachapoly_h__
+#define __included_wg_chachapoly_h__
+
+#include <vlib/vlib.h>
+#include <vnet/crypto/crypto.h>
+
+#define XCHACHA20POLY1305_NONCE_SIZE 24
+#define CHACHA20POLY1305_KEY_SIZE 32
+
+bool wg_chacha20poly1305_calc (vlib_main_t *vm, 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);
+
+bool wg_xchacha20poly1305_decrypt (vlib_main_t *vm, u8 *src, u32 src_len,
+ u8 *dst, u8 *aad, u32 aad_len,
+ u8 nonce[XCHACHA20POLY1305_NONCE_SIZE],
+ u8 key[CHACHA20POLY1305_KEY_SIZE]);
+
+#endif /* __included_wg_chachapoly_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */