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DRM removal: Forgot to decrypt HexaString objects

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This commit is contained in:
Grégory Soutadé 2023-08-05 14:43:48 +02:00
parent a0f6324999
commit e06d20a392
1 changed files with 24 additions and 0 deletions
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24
src/libgourou.cpp
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@ -1363,6 +1363,30 @@ namespace gourou
delete[] clearData;
}
else if (dictData->type() == uPDFParser::DataType::HEXASTRING)
{
string = ((uPDFParser::HexaString*) dictData)->value();
ByteArray hexStr = ByteArray::fromHex(string);
unsigned char* encryptedData = hexStr.data();
unsigned int dataLength = hexStr.size();
unsigned char* clearData = new unsigned char[dataLength];
unsigned int dataOutLength;
GOUROU_LOG(DEBUG, "Decrypt hexa string " << dictIt->first << " " << dataLength);
client->decrypt(CryptoInterface::ALGO_RC4, CryptoInterface::CHAIN_ECB,
tmpKey, sizeof(tmpKey), /* Key */
NULL, 0, /* IV */
encryptedData, dataLength,
clearData, &dataOutLength);
ByteArray clearHexStr = ByteArray(clearData, dataOutLength);
decodedStrings[dictIt->first] = new uPDFParser::HexaString(
clearHexStr.toHex());
delete[] clearData;
}
}
for (dictIt = decodedStrings.begin(); dictIt != decodedStrings.end(); dictIt++)