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diff --git a/src/lib/block/lion/lion.h b/src/lib/block/lion/lion.h
new file mode 100644
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+++ b/src/lib/block/lion/lion.h
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+/*
+* Lion
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_LION_H__
+#define BOTAN_LION_H__
+
+#include <botan/block_cipher.h>
+#include <botan/stream_cipher.h>
+#include <botan/hash.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)
+
+* http://www.cl.cam.ac.uk/~rja14/Papers/bear-lion.pdf
+*/
+class BOTAN_DLL Lion : public BlockCipher
+   {
+   public:
+      void encrypt_n(const byte in[], byte out[], size_t blocks) const;
+      void decrypt_n(const byte in[], byte out[], size_t blocks) const;
+
+      size_t block_size() const { return BLOCK_SIZE; }
+
+      Key_Length_Specification key_spec() const
+         {
+         return Key_Length_Specification(2, 2*hash->output_length(), 2);
+         }
+
+      void clear();
+      std::string name() const;
+      BlockCipher* clone() const;
+
+      /**
+      * @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);
+
+      Lion(const Lion&) = delete;
+      Lion& operator=(const Lion&) = delete;
+
+      ~Lion() { delete hash; delete cipher; }
+   private:
+      void key_schedule(const byte[], size_t);
+
+      const size_t BLOCK_SIZE, LEFT_SIZE, RIGHT_SIZE;
+
+      HashFunction* hash;
+      StreamCipher* cipher;
+      secure_vector<byte> key1, key2;
+   };
+
+}
+
+#endif