Botan 3.0.0
Crypto and TLS for C&
lion.h
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1/*
2* Lion
3* (C) 1999-2007,2014 Jack Lloyd
4*
5* Botan is released under the Simplified BSD License (see license.txt)
6*/
7
8#ifndef BOTAN_LION_H_
9#define BOTAN_LION_H_
10
11#include <botan/block_cipher.h>
12#include <botan/stream_cipher.h>
13#include <botan/hash.h>
14
15namespace Botan {
16
17/**
18* Lion is a block cipher construction designed by Ross Anderson and
19* Eli Biham, described in "Two Practical and Provably Secure Block
20* Ciphers: BEAR and LION". It has a variable block size and is
21* designed to encrypt very large blocks (up to a megabyte)
22
23* https://www.cl.cam.ac.uk/~rja14/Papers/bear-lion.pdf
24*/
25class Lion final : public BlockCipher
26 {
27 public:
28 void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
29 void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
30
31 size_t block_size() const override { return m_block_size; }
32
34 {
35 return Key_Length_Specification(2, 2*m_hash->output_length(), 2);
36 }
37
38 void clear() override;
39 std::string name() const override;
40 std::unique_ptr<BlockCipher> new_object() const override;
41 bool has_keying_material() const override;
42
43 /**
44 * @param hash the hash to use internally
45 * @param cipher the stream cipher to use internally
46 * @param block_size the size of the block to use
47 */
48 Lion(std::unique_ptr<HashFunction> hash,
49 std::unique_ptr<StreamCipher> cipher,
50 size_t block_size);
51 private:
52 void key_schedule(const uint8_t[], size_t) override;
53
54 size_t left_size() const { return m_hash->output_length(); }
55 size_t right_size() const { return m_block_size - left_size(); }
56
57 const size_t m_block_size;
58 std::unique_ptr<HashFunction> m_hash;
59 std::unique_ptr<StreamCipher> m_cipher;
60 secure_vector<uint8_t> m_key1, m_key2;
61 };
62
63}
64
65#endif
std::unique_ptr< BlockCipher > new_object() const override
Definition: lion.cpp:108
bool has_keying_material() const override
Definition: lion.cpp:78
void clear() override
Definition: lion.cpp:116
size_t block_size() const override
Definition: lion.h:31
std::string name() const override
Definition: lion.cpp:103
void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override
Definition: lion.cpp:49
Key_Length_Specification key_spec() const override
Definition: lion.h:33
void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override
Definition: lion.cpp:17
int(* final)(unsigned char *, CTX *)
Definition: alg_id.cpp:12