diff options
Diffstat (limited to 'comm/third_party/botan/src/lib/modes/cbc/cbc.h')
-rw-r--r-- | comm/third_party/botan/src/lib/modes/cbc/cbc.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/modes/cbc/cbc.h b/comm/third_party/botan/src/lib/modes/cbc/cbc.h new file mode 100644 index 0000000000..7a488dbd50 --- /dev/null +++ b/comm/third_party/botan/src/lib/modes/cbc/cbc.h @@ -0,0 +1,157 @@ +/* +* CBC mode +* (C) 1999-2007,2013 Jack Lloyd +* (C) 2016 Daniel Neus, Rohde & Schwarz Cybersecurity +* +* Botan is released under the Simplified BSD License (see license.txt) +*/ + +#ifndef BOTAN_MODE_CBC_H_ +#define BOTAN_MODE_CBC_H_ + +#include <botan/cipher_mode.h> +#include <botan/block_cipher.h> +#include <botan/mode_pad.h> + +BOTAN_FUTURE_INTERNAL_HEADER(cbc.h) + +namespace Botan { + +/** +* CBC Mode +*/ +class BOTAN_PUBLIC_API(2,0) CBC_Mode : public Cipher_Mode + { + public: + std::string name() const override; + + size_t update_granularity() 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: + CBC_Mode(BlockCipher* cipher, BlockCipherModePaddingMethod* padding); + + const BlockCipher& cipher() const { return *m_cipher; } + + const BlockCipherModePaddingMethod& padding() const + { + BOTAN_ASSERT_NONNULL(m_padding); + return *m_padding; + } + + size_t block_size() const { return m_block_size; } + + secure_vector<uint8_t>& state() { return m_state; } + + uint8_t* state_ptr() { return m_state.data(); } + + 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; + std::unique_ptr<BlockCipherModePaddingMethod> m_padding; + secure_vector<uint8_t> m_state; + size_t m_block_size; + }; + +/** +* CBC Encryption +*/ +class BOTAN_PUBLIC_API(2,0) CBC_Encryption : public CBC_Mode + { + public: + /** + * @param cipher block cipher to use + * @param padding padding method to use + */ + CBC_Encryption(BlockCipher* cipher, BlockCipherModePaddingMethod* padding) : + CBC_Mode(cipher, padding) {} + + 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; + + size_t minimum_final_size() const override; + }; + +/** +* CBC Encryption with ciphertext stealing (CBC-CS3 variant) +*/ +class BOTAN_PUBLIC_API(2,0) CTS_Encryption final : public CBC_Encryption + { + public: + /** + * @param cipher block cipher to use + */ + explicit CTS_Encryption(BlockCipher* cipher) : CBC_Encryption(cipher, nullptr) {} + + size_t output_length(size_t input_length) const override; + + void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override; + + size_t minimum_final_size() const override; + + bool valid_nonce_length(size_t n) const override; + }; + +/** +* CBC Decryption +*/ +class BOTAN_PUBLIC_API(2,0) CBC_Decryption : public CBC_Mode + { + public: + /** + * @param cipher block cipher to use + * @param padding padding method to use + */ + CBC_Decryption(BlockCipher* cipher, BlockCipherModePaddingMethod* padding) : + CBC_Mode(cipher, padding), m_tempbuf(update_granularity()) {} + + 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; + + size_t minimum_final_size() const override; + + void reset() override; + + private: + secure_vector<uint8_t> m_tempbuf; + }; + +/** +* CBC Decryption with ciphertext stealing (CBC-CS3 variant) +*/ +class BOTAN_PUBLIC_API(2,0) CTS_Decryption final : public CBC_Decryption + { + public: + /** + * @param cipher block cipher to use + */ + explicit CTS_Decryption(BlockCipher* cipher) : CBC_Decryption(cipher, nullptr) {} + + void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override; + + size_t minimum_final_size() const override; + + bool valid_nonce_length(size_t n) const override; + }; + +} + +#endif |