diff options
Diffstat (limited to 'comm/third_party/botan/src/lib/modes/aead/eax/eax.h')
-rw-r--r-- | comm/third_party/botan/src/lib/modes/aead/eax/eax.h | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/modes/aead/eax/eax.h b/comm/third_party/botan/src/lib/modes/aead/eax/eax.h new file mode 100644 index 0000000000..b9b02c192b --- /dev/null +++ b/comm/third_party/botan/src/lib/modes/aead/eax/eax.h @@ -0,0 +1,119 @@ +/* +* EAX 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_AEAD_EAX_H_ +#define BOTAN_AEAD_EAX_H_ + +#include <botan/aead.h> +#include <botan/block_cipher.h> +#include <botan/stream_cipher.h> +#include <botan/mac.h> + +BOTAN_FUTURE_INTERNAL_HEADER(eax.h) + +namespace Botan { + +/** +* EAX base class +*/ +class BOTAN_PUBLIC_API(2,0) EAX_Mode : public AEAD_Mode + { + public: + void set_associated_data(const uint8_t ad[], size_t ad_len) override; + + std::string name() const override; + + size_t update_granularity() const override; + + Key_Length_Specification key_spec() const override; + + // EAX supports arbitrary nonce lengths + bool valid_nonce_length(size_t) const override { return true; } + + size_t tag_size() const override { return m_tag_size; } + + void clear() override; + + void reset() override; + + protected: + /** + * @param cipher the cipher to use + * @param tag_size is how big the auth tag will be + */ + EAX_Mode(BlockCipher* cipher, size_t tag_size); + + size_t block_size() const { return m_cipher->block_size(); } + + size_t m_tag_size; + + std::unique_ptr<BlockCipher> m_cipher; + std::unique_ptr<StreamCipher> m_ctr; + std::unique_ptr<MessageAuthenticationCode> m_cmac; + + secure_vector<uint8_t> m_ad_mac; + + secure_vector<uint8_t> m_nonce_mac; + private: + void start_msg(const uint8_t nonce[], size_t nonce_len) override; + + void key_schedule(const uint8_t key[], size_t length) override; + }; + +/** +* EAX Encryption +*/ +class BOTAN_PUBLIC_API(2,0) EAX_Encryption final : public EAX_Mode + { + public: + /** + * @param cipher a 128-bit block cipher + * @param tag_size is how big the auth tag will be + */ + EAX_Encryption(BlockCipher* cipher, size_t tag_size = 0) : + EAX_Mode(cipher, tag_size) {} + + size_t output_length(size_t input_length) const override + { return input_length + tag_size(); } + + size_t minimum_final_size() const override { return 0; } + + size_t process(uint8_t buf[], size_t size) override; + + void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override; + }; + +/** +* EAX Decryption +*/ +class BOTAN_PUBLIC_API(2,0) EAX_Decryption final : public EAX_Mode + { + public: + /** + * @param cipher a 128-bit block cipher + * @param tag_size is how big the auth tag will be + */ + EAX_Decryption(BlockCipher* cipher, size_t tag_size = 0) : + EAX_Mode(cipher, tag_size) {} + + 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(); } + + size_t process(uint8_t buf[], size_t size) override; + + void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override; + }; + +} + +#endif |