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Diffstat (limited to 'comm/third_party/botan/src/lib/modes/aead/ccm/ccm.h')
-rw-r--r-- | comm/third_party/botan/src/lib/modes/aead/ccm/ccm.h | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/modes/aead/ccm/ccm.h b/comm/third_party/botan/src/lib/modes/aead/ccm/ccm.h new file mode 100644 index 0000000000..9b4bcecbf2 --- /dev/null +++ b/comm/third_party/botan/src/lib/modes/aead/ccm/ccm.h @@ -0,0 +1,130 @@ +/* +* CCM 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_CCM_H_ +#define BOTAN_AEAD_CCM_H_ + +#include <botan/aead.h> +#include <botan/block_cipher.h> + +BOTAN_FUTURE_INTERNAL_HEADER(ccm.h) + +namespace Botan { + +/** +* Base class for CCM encryption and decryption +* @see RFC 3610 +*/ +class BOTAN_PUBLIC_API(2,0) CCM_Mode : public AEAD_Mode + { + public: + size_t process(uint8_t buf[], size_t sz) override; + + void set_associated_data(const uint8_t ad[], size_t ad_len) override; + + bool associated_data_requires_key() const override { return false; } + + 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; + + size_t default_nonce_length() const override; + + void clear() override; + + void reset() override; + + size_t tag_size() const override { return m_tag_size; } + + protected: + CCM_Mode(BlockCipher* cipher, size_t tag_size, size_t L); + + size_t L() const { return m_L; } + + const BlockCipher& cipher() const { return *m_cipher; } + + void encode_length(uint64_t len, uint8_t out[]); + + void inc(secure_vector<uint8_t>& C); + + const secure_vector<uint8_t>& ad_buf() const { return m_ad_buf; } + + secure_vector<uint8_t>& msg_buf() { return m_msg_buf; } + + secure_vector<uint8_t> format_b0(size_t msg_size); + secure_vector<uint8_t> format_c0(); + 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 size_t m_tag_size; + const size_t m_L; + + std::unique_ptr<BlockCipher> m_cipher; + secure_vector<uint8_t> m_nonce, m_msg_buf, m_ad_buf; + }; + +/** +* CCM Encryption +*/ +class BOTAN_PUBLIC_API(2,0) CCM_Encryption final : public CCM_Mode + { + public: + /** + * @param cipher a 128-bit block cipher + * @param tag_size is how big the auth tag will be (even values + * between 4 and 16 are accepted) + * @param L length of L parameter. The total message length + * must be less than 2**L bytes, and the nonce is 15-L bytes. + */ + CCM_Encryption(BlockCipher* cipher, size_t tag_size = 16, size_t L = 3) : + CCM_Mode(cipher, tag_size, L) {} + + 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; } + }; + +/** +* CCM Decryption +*/ +class BOTAN_PUBLIC_API(2,0) CCM_Decryption final : public CCM_Mode + { + public: + /** + * @param cipher a 128-bit block cipher + * @param tag_size is how big the auth tag will be (even values + * between 4 and 16 are accepted) + * @param L length of L parameter. The total message length + * must be less than 2**L bytes, and the nonce is 15-L bytes. + */ + CCM_Decryption(BlockCipher* cipher, size_t tag_size = 16, size_t L = 3) : + CCM_Mode(cipher, tag_size, L) {} + + 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 |