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Diffstat (limited to '')
-rw-r--r-- | comm/third_party/botan/src/lib/modes/aead/siv/siv.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/modes/aead/siv/siv.h b/comm/third_party/botan/src/lib/modes/aead/siv/siv.h new file mode 100644 index 0000000000..c76fd32296 --- /dev/null +++ b/comm/third_party/botan/src/lib/modes/aead/siv/siv.h @@ -0,0 +1,129 @@ +/* +* SIV Mode +* (C) 2013 Jack Lloyd +* (C) 2016 Daniel Neus, Rohde & Schwarz Cybersecurity +* +* Botan is released under the Simplified BSD License (see license.txt) +*/ + +#ifndef BOTAN_AEAD_SIV_H_ +#define BOTAN_AEAD_SIV_H_ + +#include <botan/aead.h> +#include <botan/stream_cipher.h> + +BOTAN_FUTURE_INTERNAL_HEADER(siv.h) + +namespace Botan { + +class BlockCipher; +class MessageAuthenticationCode; + +/** +* Base class for SIV encryption and decryption (@see RFC 5297) +*/ +class BOTAN_PUBLIC_API(2,0) SIV_Mode : public AEAD_Mode + { + public: + size_t process(uint8_t buf[], size_t size) override; + + /** + * Sets the nth element of the vector of associated data + * @param n index into the AD vector + * @param ad associated data + * @param ad_len length of associated data in bytes + */ + void set_associated_data_n(size_t n, const uint8_t ad[], size_t ad_len) override; + + size_t maximum_associated_data_inputs() const override; + + void set_associated_data(const uint8_t ad[], size_t ad_len) override + { + set_associated_data_n(0, ad, ad_len); + } + + std::string name() const override; + + size_t update_granularity() const override; + + Key_Length_Specification key_spec() const override; + + bool valid_nonce_length(size_t) const override; + + void clear() override; + + void reset() override; + + size_t tag_size() const override { return 16; } + + ~SIV_Mode(); + + protected: + explicit SIV_Mode(BlockCipher* cipher); + + size_t block_size() const { return m_bs; } + + StreamCipher& ctr() { return *m_ctr; } + + void set_ctr_iv(secure_vector<uint8_t> V); + + secure_vector<uint8_t>& msg_buf() { return m_msg_buf; } + + secure_vector<uint8_t> S2V(const uint8_t text[], size_t text_len); + private: + void start_msg(const uint8_t nonce[], size_t nonce_len) override; + + void key_schedule(const uint8_t key[], size_t length) override; + + const std::string m_name; + std::unique_ptr<StreamCipher> m_ctr; + std::unique_ptr<MessageAuthenticationCode> m_mac; + secure_vector<uint8_t> m_nonce, m_msg_buf; + std::vector<secure_vector<uint8_t>> m_ad_macs; + const size_t m_bs; + }; + +/** +* SIV Encryption +*/ +class BOTAN_PUBLIC_API(2,0) SIV_Encryption final : public SIV_Mode + { + public: + /** + * @param cipher a block cipher + */ + explicit SIV_Encryption(BlockCipher* cipher) : SIV_Mode(cipher) {} + + void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override; + + size_t output_length(size_t input_length) const override + { return input_length + tag_size(); } + + size_t minimum_final_size() const override { return 0; } + }; + +/** +* SIV Decryption +*/ +class BOTAN_PUBLIC_API(2,0) SIV_Decryption final : public SIV_Mode + { + public: + /** + * @param cipher a 128-bit block cipher + */ + explicit SIV_Decryption(BlockCipher* cipher) : SIV_Mode(cipher) {} + + void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override; + + size_t output_length(size_t input_length) const override + { + BOTAN_ASSERT(input_length >= tag_size(), "Sufficient input"); + return input_length - tag_size(); + } + + size_t minimum_final_size() const override { return tag_size(); } + }; + +} + +#endif |