65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2016 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __CRYPTO_ICE_HPP
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#define __CRYPTO_ICE_HPP
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#include <cstdint>
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#include <array>
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#include <vector>
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// An implementation of the ICE symmetric-key block cipher
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//
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// we make a token attempt to zero our buffers, but we can't guarantee this
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// will take place (given compiler optimisations). further security is
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// outside the scope of this class.
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class ice {
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public:
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ice (unsigned n, uint64_t key);
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ice (unsigned n,
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const uint64_t *key_first,
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const uint64_t *key_last);
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~ice ();
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void
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set (const uint64_t *key_first, const uint64_t *key_last);
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uint64_t encrypt (uint64_t plaintext) const;
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uint64_t decrypt (uint64_t ciphertext) const;
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unsigned key_size () const;
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unsigned block_size () const;
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using subkey_t = std::array<uint32_t,3>;
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private:
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void
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scheduleBuild (std::array<uint16_t,4> &k,
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int n,
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const std::array<uint_fast8_t,8> &keyrot);
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unsigned m_size;
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unsigned m_rounds;
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std::vector<subkey_t> m_schedule;
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};
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struct ice_error : public std::runtime_error { using runtime_error::runtime_error; };
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struct level_error : public ice_error { using ice_error::ice_error; };
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#endif
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