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Diffstat (limited to 'src/lib/stream/ctr/ctr.h')
-rw-r--r-- | src/lib/stream/ctr/ctr.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/lib/stream/ctr/ctr.h b/src/lib/stream/ctr/ctr.h new file mode 100644 index 000000000..84cf9ed5d --- /dev/null +++ b/src/lib/stream/ctr/ctr.h @@ -0,0 +1,61 @@ +/* +* CTR-BE Mode +* (C) 1999-2007 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#ifndef BOTAN_CTR_BE_H__ +#define BOTAN_CTR_BE_H__ + +#include <botan/block_cipher.h> +#include <botan/stream_cipher.h> + +namespace Botan { + +/** +* CTR-BE (Counter mode, big-endian) +*/ +class BOTAN_DLL CTR_BE : public StreamCipher + { + public: + void cipher(const byte in[], byte out[], size_t length); + + void set_iv(const byte iv[], size_t iv_len); + + bool valid_iv_length(size_t iv_len) const + { return (iv_len <= permutation->block_size()); } + + Key_Length_Specification key_spec() const + { + return permutation->key_spec(); + } + + std::string name() const; + + CTR_BE* clone() const + { return new CTR_BE(permutation->clone()); } + + void clear(); + + /** + * @param cipher the underlying block cipher to use + */ + CTR_BE(BlockCipher* cipher); + + CTR_BE(const CTR_BE&) = delete; + CTR_BE& operator=(const CTR_BE&) = delete; + + ~CTR_BE(); + private: + void key_schedule(const byte key[], size_t key_len); + void increment_counter(); + + BlockCipher* permutation; + secure_vector<byte> counter, buffer; + size_t position; + }; + +} + +#endif |