CryptoBuffer CommonCryptoCipher::DecryptBuffer(const CryptoBuffer& encryptedData)
{
if (m_failure)
{
AWS_LOGSTREAM_FATAL(CC_LOG_TAG, "Cipher not properly initialized for decryption. Aborting");
return CryptoBuffer();
}
CheckInitDecryptor();
size_t lengthWritten = encryptedData.GetLength() + (GetBlockSizeBytes() - 1);
CryptoBuffer decryptedText(static_cast<size_t>(lengthWritten));
CCStatus status = CCCryptorUpdate(m_cryptoHandle, encryptedData.GetUnderlyingData(), encryptedData.GetLength(),
decryptedText.GetUnderlyingData(), decryptedText.GetLength(), &lengthWritten);
if (status != kCCSuccess)
{
m_failure = true;
AWS_LOGSTREAM_ERROR(CC_LOG_TAG, "Decryption of buffer failed with status code: " << status);
return CryptoBuffer();
}
if (lengthWritten < decryptedText.GetLength())
{
return CryptoBuffer(decryptedText.GetUnderlyingData(), static_cast<size_t>(lengthWritten));
}
return decryptedText;
}
void VigenereCipherTab::decryptText()
{
if(ui->txtKey->text().length() == 0) return;
QString dText = Cipher::vigenereDecrypt(mEncryptText, ui->txtKey->text());
emit decryptedText(dText);
}