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diff --git a/comm/third_party/botan/src/lib/block/lion/lion.h b/comm/third_party/botan/src/lib/block/lion/lion.h
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+++ b/comm/third_party/botan/src/lib/block/lion/lion.h
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+/*
+* Lion
+* (C) 1999-2007,2014 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_LION_H_
+#define BOTAN_LION_H_
+
+#include <botan/block_cipher.h>
+#include <botan/stream_cipher.h>
+#include <botan/hash.h>
+
+BOTAN_FUTURE_INTERNAL_HEADER(lion.h)
+
+namespace Botan {
+
+/**
+* Lion is a block cipher construction designed by Ross Anderson and
+* Eli Biham, described in "Two Practical and Provably Secure Block
+* Ciphers: BEAR and LION". It has a variable block size and is
+* designed to encrypt very large blocks (up to a megabyte)
+
+* https://www.cl.cam.ac.uk/~rja14/Papers/bear-lion.pdf
+*/
+class BOTAN_PUBLIC_API(2,0) Lion final : public BlockCipher
+   {
+   public:
+      void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
+      void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
+
+      size_t block_size() const override { return m_block_size; }
+
+      Key_Length_Specification key_spec() const override
+         {
+         return Key_Length_Specification(2, 2*m_hash->output_length(), 2);
+         }
+
+      void clear() override;
+      std::string name() const override;
+      BlockCipher* clone() const override;
+
+      /**
+      * @param hash the hash to use internally
+      * @param cipher the stream cipher to use internally
+      * @param block_size the size of the block to use
+      */
+      Lion(HashFunction* hash,
+           StreamCipher* cipher,
+           size_t block_size);
+   private:
+      void key_schedule(const uint8_t[], size_t) override;
+
+      size_t left_size() const { return m_hash->output_length(); }
+      size_t right_size() const { return m_block_size - left_size(); }
+
+      const size_t m_block_size;
+      std::unique_ptr<HashFunction> m_hash;
+      std::unique_ptr<StreamCipher> m_cipher;
+      secure_vector<uint8_t> m_key1, m_key2;
+   };
+
+}
+
+#endif