Botan 2.19.1
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
16
17namespace Botan {
18
19/**
20* Lion is a block cipher construction designed by Ross Anderson and
21* Eli Biham, described in "Two Practical and Provably Secure Block
22* Ciphers: BEAR and LION". It has a variable block size and is
23* designed to encrypt very large blocks (up to a megabyte)
24
25* https://www.cl.cam.ac.uk/~rja14/Papers/bear-lion.pdf
26*/
28 {
29 public:
30 void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
31 void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
32
33 size_t block_size() const override { return m_block_size; }
34
36 {
37 return Key_Length_Specification(2, 2*m_hash->output_length(), 2);
38 }
39
40 void clear() override;
41 std::string name() const override;
42 BlockCipher* clone() const override;
43
44 /**
45 * @param hash the hash to use internally
46 * @param cipher the stream cipher to use internally
47 * @param block_size the size of the block to use
48 */
50 StreamCipher* cipher,
51 size_t block_size);
52 private:
53 void key_schedule(const uint8_t[], size_t) override;
54
55 size_t left_size() const { return m_hash->output_length(); }
56 size_t right_size() const { return m_block_size - left_size(); }
57
58 const size_t m_block_size;
59 std::unique_ptr<HashFunction> m_hash;
60 std::unique_ptr<StreamCipher> m_cipher;
61 secure_vector<uint8_t> m_key1, m_key2;
62 };
63
64}
65
66#endif
virtual BlockCipher * clone() const =0
virtual void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const =0
virtual void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const =0
size_t block_size() const override
Definition: lion.h:33
Key_Length_Specification key_spec() const override
Definition: lion.h:35
virtual std::string name() const =0
virtual void clear()=0
int(* final)(unsigned char *, CTX *)
#define BOTAN_PUBLIC_API(maj, min)
Definition: compiler.h:31
#define BOTAN_FUTURE_INTERNAL_HEADER(hdr)
Definition: compiler.h:136
Definition: alg_id.cpp:13
MechanismType hash