diff options
Diffstat (limited to 'comm/third_party/botan/src/lib/stream/ctr/ctr.h')
-rw-r--r-- | comm/third_party/botan/src/lib/stream/ctr/ctr.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/stream/ctr/ctr.h b/comm/third_party/botan/src/lib/stream/ctr/ctr.h new file mode 100644 index 0000000000..0687c606e1 --- /dev/null +++ b/comm/third_party/botan/src/lib/stream/ctr/ctr.h @@ -0,0 +1,65 @@ +/* +* CTR-BE Mode +* (C) 1999-2007 Jack Lloyd +* +* Botan is released under the Simplified BSD License (see license.txt) +*/ + +#ifndef BOTAN_CTR_BE_H_ +#define BOTAN_CTR_BE_H_ + +#include <botan/block_cipher.h> +#include <botan/stream_cipher.h> + +BOTAN_FUTURE_INTERNAL_HEADER(ctr.h) + +namespace Botan { + +/** +* CTR-BE (Counter mode, big-endian) +*/ +class BOTAN_PUBLIC_API(2,0) CTR_BE final : public StreamCipher + { + public: + void cipher(const uint8_t in[], uint8_t out[], size_t length) override; + + void set_iv(const uint8_t iv[], size_t iv_len) override; + + size_t default_iv_length() const override; + + bool valid_iv_length(size_t iv_len) const override; + + Key_Length_Specification key_spec() const override; + + std::string name() const override; + + CTR_BE* clone() const override; + + void clear() override; + + /** + * @param cipher the block cipher to use + */ + explicit CTR_BE(BlockCipher* cipher); + + CTR_BE(BlockCipher* cipher, size_t ctr_size); + + void seek(uint64_t offset) override; + private: + void key_schedule(const uint8_t key[], size_t key_len) override; + void add_counter(const uint64_t counter); + + std::unique_ptr<BlockCipher> m_cipher; + + const size_t m_block_size; + const size_t m_ctr_size; + const size_t m_ctr_blocks; + + secure_vector<uint8_t> m_counter, m_pad; + std::vector<uint8_t> m_iv; + size_t m_pad_pos; + }; + +} + +#endif |