hardcoresushi/libcryfs
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Implemented encryption

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This commit is contained in:
Sebastian Messmer 2015-04-09 22:11:40 +02:00
parent e210b5b601
commit 3cbc851c19
1 changed files with 8 additions and 5 deletions
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13
implementations/encrypted/EncryptedBlock.cpp
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@ -3,7 +3,7 @@
#include "../../utils/BlockStoreUtils.h"
using CryptoPP::CBC_Mode;
using CryptoPP::CFB_Mode;
using CryptoPP::AES;
using std::make_unique;
@ -55,16 +55,19 @@ size_t EncryptedBlock::size() const {
void EncryptedBlock::_decryptFromBaseBlock() {
const byte *iv = (byte*)_baseBlock->data();
const byte *data = (byte*)_baseBlock->data() + IV_SIZE;
auto dec = CBC_Mode<AES>::Decryption((byte*)_encKey.data(), EncryptionKey::BINARY_LENGTH, iv);
std::memcpy(_plaintextData.data(), (byte*)_baseBlock->data()+IV_SIZE, _plaintextData.size());
auto decryption = CFB_Mode<AES>::Decryption((byte*)_encKey.data(), EncryptionKey::BINARY_LENGTH, iv);
decryption.ProcessData((byte*)_plaintextData.data(), data, _plaintextData.size());
}
void EncryptedBlock::_encryptToBaseBlock() {
if (_dataChanged) {
FixedSizeData<IV_SIZE> iv = FixedSizeData<IV_SIZE>::CreateRandom();
auto enc = CBC_Mode<AES>::Decryption(_encKey.data(), EncryptionKey::BINARY_LENGTH, iv.data());
auto encryption = CFB_Mode<AES>::Encryption(_encKey.data(), EncryptionKey::BINARY_LENGTH, iv.data());
//TODO More performance when not using "Data encrypted" object, but specialized CryptoPP sink
Data encrypted(_plaintextData.size());
encryption.ProcessData((byte*)encrypted.data(), (byte*)_plaintextData.data(), _plaintextData.size());
_baseBlock->write(iv.data(), 0, IV_SIZE);
_baseBlock->write(_plaintextData.data(), IV_SIZE, _plaintextData.size());
_baseBlock->write(encrypted.data(), IV_SIZE, encrypted.size());
_dataChanged = false;
}
}