37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
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#pragma once
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#ifndef MESSMER_BLOCKSTORE_IMPLEMENTATIONS_ENCRYPTED_CIPHERS_AES256_CFB_H_
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#define MESSMER_BLOCKSTORE_IMPLEMENTATIONS_ENCRYPTED_CIPHERS_AES256_CFB_H_
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#include "../../../utils/FixedSizeData.h"
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#include <cryptopp/cryptopp/aes.h>
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namespace blockstore {
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namespace encrypted {
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class AES256_CFB {
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public:
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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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AES256_CFB(const EncryptionKey &key);
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static constexpr unsigned int ciphertextSize(unsigned int plaintextBlockSize) {
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return plaintextBlockSize + IV_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;
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}
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static void encrypt(const byte *plaintext, unsigned int plaintextSize, byte *ciphertext, const EncryptionKey &key);
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static void decrypt(const byte *ciphertext, byte *plaintext, unsigned int plaintextSize, const EncryptionKey &key);
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private:
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static constexpr unsigned int IV_SIZE = CryptoPP::AES::BLOCKSIZE;
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};
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}
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}
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#endif
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