/usr/include/botan-2/botan/xts.h is in libbotan-2-dev 2.4.0-5ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 | /*
* XTS mode, from IEEE P1619
* (C) 2009,2013 Jack Lloyd
* (C) 2016 Daniel Neus, Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_MODE_XTS_H_
#define BOTAN_MODE_XTS_H_
#include <botan/cipher_mode.h>
#include <botan/block_cipher.h>
namespace Botan {
/**
* IEEE P1619 XTS Mode
*/
class BOTAN_PUBLIC_API(2,0) XTS_Mode : public Cipher_Mode
{
public:
std::string name() const override;
size_t update_granularity() const override;
size_t minimum_final_size() const override;
Key_Length_Specification key_spec() const override;
size_t default_nonce_length() const override;
bool valid_nonce_length(size_t n) const override;
void clear() override;
void reset() override;
protected:
explicit XTS_Mode(BlockCipher* cipher);
const uint8_t* tweak() const { return m_tweak.data(); }
const BlockCipher& cipher() const { return *m_cipher; }
void update_tweak(size_t last_used);
private:
void start_msg(const uint8_t nonce[], size_t nonce_len) override;
void key_schedule(const uint8_t key[], size_t length) override;
std::unique_ptr<BlockCipher> m_cipher, m_tweak_cipher;
secure_vector<uint8_t> m_tweak;
};
/**
* IEEE P1619 XTS Encryption
*/
class BOTAN_PUBLIC_API(2,0) XTS_Encryption final : public XTS_Mode
{
public:
/**
* @param cipher underlying block cipher
*/
explicit XTS_Encryption(BlockCipher* cipher) : XTS_Mode(cipher) {}
size_t process(uint8_t buf[], size_t size) override;
void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override;
size_t output_length(size_t input_length) const override;
};
/**
* IEEE P1619 XTS Decryption
*/
class BOTAN_PUBLIC_API(2,0) XTS_Decryption final : public XTS_Mode
{
public:
/**
* @param cipher underlying block cipher
*/
explicit XTS_Decryption(BlockCipher* cipher) : XTS_Mode(cipher) {}
size_t process(uint8_t buf[], size_t size) override;
void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override;
size_t output_length(size_t input_length) const override;
};
}
#endif
|