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path: root/src/plugins/wireguard/wireguard_chachapoly.c
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-rw-r--r--src/plugins/wireguard/wireguard_chachapoly.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/src/plugins/wireguard/wireguard_chachapoly.c b/src/plugins/wireguard/wireguard_chachapoly.c
index 961b43f100d..0dd7908d2e2 100644
--- a/src/plugins/wireguard/wireguard_chachapoly.c
+++ b/src/plugins/wireguard/wireguard_chachapoly.c
@@ -61,6 +61,36 @@ wg_chacha20poly1305_calc (vlib_main_t *vm, u8 *src, u32 src_len, u8 *dst,
return (op->status == VNET_CRYPTO_OP_STATUS_COMPLETED);
}
+void
+wg_xchacha20poly1305_encrypt (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])
+{
+ int i;
+ u32 derived_key[CHACHA20POLY1305_KEY_SIZE / sizeof (u32)];
+ u64 h_nonce;
+
+ clib_memcpy (&h_nonce, nonce + 16, sizeof (h_nonce));
+ h_nonce = le64toh (h_nonce);
+ hchacha20 (derived_key, nonce, key);
+
+ for (i = 0; i < (sizeof (derived_key) / sizeof (derived_key[0])); i++)
+ (derived_key[i]) = htole32 ((derived_key[i]));
+
+ uint32_t key_idx;
+
+ key_idx =
+ vnet_crypto_key_add (vm, VNET_CRYPTO_ALG_CHACHA20_POLY1305,
+ (uint8_t *) derived_key, CHACHA20POLY1305_KEY_SIZE);
+
+ wg_chacha20poly1305_calc (vm, src, src_len, dst, aad, aad_len, h_nonce,
+ VNET_CRYPTO_OP_CHACHA20_POLY1305_ENC, key_idx);
+
+ vnet_crypto_key_del (vm, key_idx);
+ wg_secure_zero_memory (derived_key, CHACHA20POLY1305_KEY_SIZE);
+}
+
bool
wg_xchacha20poly1305_decrypt (vlib_main_t *vm, u8 *src, u32 src_len, u8 *dst,
u8 *aad, u32 aad_len,