0042ae1cef
- Implement FakeAuthenticatedCipher for use with specific EncryptedBlockStoreTest - Write skeleton for specific EncryptedBlockStoreTest - Fix behavior of AES256_CFB when called with too small input - Add testcase that all ciphers (also non-authenticating ones) have to handle too small input correctly
38 lines
1.3 KiB
C++
38 lines
1.3 KiB
C++
#include <cryptopp/cryptopp/modes.h>
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#include "AES256_CFB.h"
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using CryptoPP::CFB_Mode;
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using CryptoPP::AES;
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using cpputils::Data;
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using cpputils::FixedSizeData;
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namespace blockstore {
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namespace encrypted {
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constexpr unsigned int AES256_CFB::IV_SIZE;
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Data AES256_CFB::encrypt(const byte *plaintext, unsigned int plaintextSize, const EncryptionKey &encKey) {
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FixedSizeData<IV_SIZE> iv = FixedSizeData<IV_SIZE>::CreateRandom();
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auto encryption = CFB_Mode<AES>::Encryption(encKey.data(), encKey.BINARY_LENGTH, iv.data());
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Data ciphertext(ciphertextSize(plaintextSize));
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std::memcpy(ciphertext.data(), iv.data(), IV_SIZE);
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encryption.ProcessData((byte*)ciphertext.data() + IV_SIZE, plaintext, plaintextSize);
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return ciphertext;
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}
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boost::optional<Data> AES256_CFB::decrypt(const byte *ciphertext, unsigned int ciphertextSize, const EncryptionKey &encKey) {
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if (ciphertextSize < IV_SIZE) {
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return boost::none;
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}
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const byte *ciphertextIV = ciphertext;
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const byte *ciphertextData = ciphertext + IV_SIZE;
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auto decryption = CFB_Mode<AES>::Decryption((byte*)encKey.data(), encKey.BINARY_LENGTH, ciphertextIV);
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Data plaintext(plaintextSize(ciphertextSize));
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decryption.ProcessData((byte*)plaintext.data(), ciphertextData, plaintext.size());
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return std::move(plaintext);
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}
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}
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}
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