41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
#pragma once
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#ifndef MESSMER_BLOCKSTORE_IMPLEMENTATIONS_ENCRYPTED_CIPHERS_AES256_GCM_H_
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#define MESSMER_BLOCKSTORE_IMPLEMENTATIONS_ENCRYPTED_CIPHERS_AES256_GCM_H_
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#include "../../../utils/FixedSizeData.h"
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#include "../../../utils/Data.h"
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#include <cryptopp/cryptopp/aes.h>
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#include <boost/optional.hpp>
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#include "Cipher.h"
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namespace blockstore {
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namespace encrypted {
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class AES256_GCM {
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public:
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BOOST_CONCEPT_ASSERT((CipherConcept<AES256_GCM>));
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using EncryptionKey = FixedSizeData<32>;
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static_assert(32 == CryptoPP::AES::MAX_KEYLENGTH, "If AES offered larger keys, we should offer a variant with it");
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static constexpr unsigned int ciphertextSize(unsigned int plaintextBlockSize) {
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return plaintextBlockSize + IV_SIZE + TAG_SIZE;
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}
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static constexpr unsigned int plaintextSize(unsigned int ciphertextBlockSize) {
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return ciphertextBlockSize - IV_SIZE - TAG_SIZE;
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}
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static Data encrypt(const byte *plaintext, unsigned int plaintextSize, const EncryptionKey &encKey);
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static boost::optional<Data> decrypt(const byte *ciphertext, unsigned int ciphertextSize, const EncryptionKey &encKey);
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private:
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static constexpr unsigned int IV_SIZE = CryptoPP::AES::BLOCKSIZE;
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static constexpr unsigned int TAG_SIZE = 16;
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};
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}
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}
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#endif
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