Botan 2.19.3
Crypto and TLS for C&
ctr.h
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1/*
2* CTR-BE Mode
3* (C) 1999-2007 Jack Lloyd
4*
5* Botan is released under the Simplified BSD License (see license.txt)
6*/
7
8#ifndef BOTAN_CTR_BE_H_
9#define BOTAN_CTR_BE_H_
10
11#include <botan/block_cipher.h>
12#include <botan/stream_cipher.h>
13
15
16namespace Botan {
17
18/**
19* CTR-BE (Counter mode, big-endian)
20*/
22 {
23 public:
24 void cipher(const uint8_t in[], uint8_t out[], size_t length) override;
25
26 void set_iv(const uint8_t iv[], size_t iv_len) override;
27
28 size_t default_iv_length() const override;
29
30 bool valid_iv_length(size_t iv_len) const override;
31
32 Key_Length_Specification key_spec() const override;
33
34 std::string name() const override;
35
36 CTR_BE* clone() const override;
37
38 void clear() override;
39
40 /**
41 * @param cipher the block cipher to use
42 */
43 explicit CTR_BE(BlockCipher* cipher);
44
45 CTR_BE(BlockCipher* cipher, size_t ctr_size);
46
47 void seek(uint64_t offset) override;
48 private:
49 void key_schedule(const uint8_t key[], size_t key_len) override;
50 void add_counter(const uint64_t counter);
51
52 std::unique_ptr<BlockCipher> m_cipher;
53
54 const size_t m_block_size;
55 const size_t m_ctr_size;
56 const size_t m_ctr_blocks;
57
58 secure_vector<uint8_t> m_counter, m_pad;
59 std::vector<uint8_t> m_iv;
60 size_t m_pad_pos;
61 };
62
63}
64
65#endif
virtual void cipher(const uint8_t in[], uint8_t out[], size_t len)=0
virtual size_t default_iv_length() const
virtual StreamCipher * clone() const =0
virtual void set_iv(const uint8_t iv[], size_t iv_len)=0
virtual void seek(uint64_t offset)=0
virtual bool valid_iv_length(size_t iv_len) const
virtual std::string name() const =0
virtual void clear()=0
virtual Key_Length_Specification key_spec() const =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
std::vector< T, secure_allocator< T > > secure_vector
Definition secmem.h:65