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diff --git a/comm/third_party/botan/src/lib/modes/xts/xts.h b/comm/third_party/botan/src/lib/modes/xts/xts.h
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+++ b/comm/third_party/botan/src/lib/modes/xts/xts.h
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+/*
+* XTS mode, from IEEE P1619
+* (C) 2009,2013 Jack Lloyd
+* (C) 2016 Daniel Neus, Rohde & Schwarz Cybersecurity
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_MODE_XTS_H_
+#define BOTAN_MODE_XTS_H_
+
+#include <botan/cipher_mode.h>
+#include <botan/block_cipher.h>
+
+BOTAN_FUTURE_INTERNAL_HEADER(xts.h)
+
+namespace Botan {
+
+/**
+* IEEE P1619 XTS Mode
+*/
+class BOTAN_PUBLIC_API(2,0) XTS_Mode : public Cipher_Mode
+   {
+   public:
+      std::string name() const override;
+
+      size_t update_granularity() const override { return m_cipher_parallelism; }
+
+      size_t minimum_final_size() const override;
+
+      Key_Length_Specification key_spec() const override;
+
+      size_t default_nonce_length() const override;
+
+      bool valid_nonce_length(size_t n) const override;
+
+      void clear() override;
+
+      void reset() override;
+
+   protected:
+      explicit XTS_Mode(BlockCipher* cipher);
+
+      const uint8_t* tweak() const { return m_tweak.data(); }
+
+      bool tweak_set() const { return m_tweak.empty() == false; }
+
+      const BlockCipher& cipher() const { return *m_cipher; }
+
+      void update_tweak(size_t last_used);
+
+      size_t cipher_block_size() const { return m_cipher_block_size; }
+
+   private:
+      void start_msg(const uint8_t nonce[], size_t nonce_len) override;
+      void key_schedule(const uint8_t key[], size_t length) override;
+
+      std::unique_ptr<BlockCipher> m_cipher;
+      std::unique_ptr<BlockCipher> m_tweak_cipher;
+      secure_vector<uint8_t> m_tweak;
+      const size_t m_cipher_block_size;
+      const size_t m_cipher_parallelism;
+   };
+
+/**
+* IEEE P1619 XTS Encryption
+*/
+class BOTAN_PUBLIC_API(2,0) XTS_Encryption final : public XTS_Mode
+   {
+   public:
+      /**
+      * @param cipher underlying block cipher
+      */
+      explicit XTS_Encryption(BlockCipher* cipher) : XTS_Mode(cipher) {}
+
+      size_t process(uint8_t buf[], size_t size) override;
+
+      void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override;
+
+      size_t output_length(size_t input_length) const override;
+   };
+
+/**
+* IEEE P1619 XTS Decryption
+*/
+class BOTAN_PUBLIC_API(2,0) XTS_Decryption final : public XTS_Mode
+   {
+   public:
+      /**
+      * @param cipher underlying block cipher
+      */
+      explicit XTS_Decryption(BlockCipher* cipher) : XTS_Mode(cipher) {}
+
+      size_t process(uint8_t buf[], size_t size) override;
+
+      void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override;
+
+      size_t output_length(size_t input_length) const override;
+   };
+
+}
+
+#endif