Add a private option into adept_remove to provide encryption key

include/libgourou.h

@@ -185,10 +185,16 @@ namespace gourou
 	DRMProcessorClient* getClient() { return client; }
 		
 	/**
-	 * @brief Remove ADEPT DRM.
+	 * @brief Remove ADEPT DRM
 	 * Warning: for PDF format, filenameIn must be different than filenameOut
+	 *
+	 * @param filenameIn         Input file (with ADEPT DRM)
+	 * @param filenameOut        Output file (without ADEPT DRM)
+	 * @param type               Type of file (ePub or PDF)
+	 * @param encryptionKey      Optional encryption key, do not try to decrypt the one inside input file
+	 * @param encryptionKeySize  Size of encryption key (if provided)
 	 */
-	void removeDRM(const std::string& filenameIn, const std::string& filenameOut, ITEM_TYPE type);
+	void removeDRM(const std::string& filenameIn, const std::string& filenameOut, ITEM_TYPE type, const unsigned char* encryptionKey=0, unsigned encryptionKeySize=0);
 	
     private:
 	gourou::DRMProcessorClient* client;
@@ -214,12 +220,12 @@ namespace gourou
 	void fetchLicenseServiceCertificate(const std::string& licenseURL,
 					    const std::string& operatorURL);
 	void decryptADEPTKey(const std::string& encryptedKey, unsigned char* decryptedKey);
-	void removeEPubDRM(const std::string& filenameIn, const std::string& filenameOut);
+	void removeEPubDRM(const std::string& filenameIn, const std::string& filenameOut, const unsigned char* encryptionKey, unsigned encryptionKeySize);
 	void generatePDFObjectKey(int version,
 				  const unsigned char* masterKey, unsigned int masterKeyLength,
 				  int objectId, int objectGenerationNumber,
 				  unsigned char* keyOut);
-	void removePDFDRM(const std::string& filenameIn, const std::string& filenameOut);
+	void removePDFDRM(const std::string& filenameIn, const std::string& filenameOut, const unsigned char* encryptionKey, unsigned encryptionKeySize);
     };
 }
 

include/libgourou_common.h

@@ -92,6 +92,7 @@ namespace gourou
 	USER_INVALID_ACTIVATION_FILE,
 	USER_NO_AUTHENTICATION_URL,
 	USER_NO_PROPERTY,
+	USER_INVALID_INPUT,
     };
 
     enum FULFILL_ITEM_ERROR {

src/libgourou.cpp

@@ -949,7 +949,8 @@ namespace gourou
     }
 
     
-    void DRMProcessor::removeEPubDRM(const std::string& filenameIn, const std::string& filenameOut)
+    void DRMProcessor::removeEPubDRM(const std::string& filenameIn, const std::string& filenameOut,
+				     const unsigned char* encryptionKey, unsigned encryptionKeySize)
     {
 	ByteArray zipData;
 	bool removeEncryptionXML = true;
@@ -962,7 +963,16 @@ namespace gourou
 	std::string encryptedKey = extractTextElem(rightsDoc, "/adept:rights/licenseToken/encryptedKey");
 	unsigned char decryptedKey[RSA_KEY_SIZE];
 
+	if (!encryptionKey)
 	    decryptADEPTKey(encryptedKey, decryptedKey);
+	else
+	{
+	    GOUROU_LOG(DEBUG, "Use provided encryption key");
+	    if (encryptionKeySize != 16)
+		EXCEPTION(DRM_ERR_ENCRYPTION_KEY, "Provided encryption key must be 16 bytes");
+
+	    memcpy(&decryptedKey[sizeof(decryptedKey)-16], encryptionKey, encryptionKeySize);
+	}
 	
 	client->zipReadFile(zipHandler, "META-INF/encryption.xml", zipData);
 	pugi::xml_document encryptionDoc;
@@ -1001,7 +1011,7 @@ namespace gourou
 		unsigned int dataOutLength;
 
 		client->Decrypt(CryptoInterface::ALGO_AES, CryptoInterface::CHAIN_CBC,
-				decryptedKey+RSA_KEY_SIZE-16, 16, /* Key */
+				decryptedKey+sizeof(decryptedKey)-16, 16, /* Key */
 				_data, 16, /* IV */
 				&_data[16], zipData.length()-16,
 				_clearData, &dataOutLength);
@@ -1068,7 +1078,8 @@ namespace gourou
 	}
     }
     
-    void DRMProcessor::removePDFDRM(const std::string& filenameIn, const std::string& filenameOut)
+    void DRMProcessor::removePDFDRM(const std::string& filenameIn, const std::string& filenameOut,
+				    const unsigned char* encryptionKey, unsigned encryptionKeySize)
     {
 	uPDFParser::Parser parser;
 	bool EBXHandlerFound = false;
@@ -1134,7 +1145,17 @@ namespace gourou
 
 		std::string encryptedKey = extractTextElem(rightsDoc, "/adept:rights/licenseToken/encryptedKey");
 
+		if (!encryptionKey)
 		    decryptADEPTKey(encryptedKey, decryptedKey);
+		else
+		{
+		    GOUROU_LOG(DEBUG, "Use provided encryption key");
+		    if (encryptionKeySize != 16)
+			EXCEPTION(DRM_ERR_ENCRYPTION_KEY, "Provided encryption key must be 16 bytes");
+
+		    memcpy(&decryptedKey[sizeof(decryptedKey)-16], encryptionKey, encryptionKeySize);
+		}
+		
 		ebxId = ebx->objectId();
 
 		break;
@@ -1168,7 +1189,7 @@ namespace gourou
 	    unsigned char tmpKey[16];
 
 	    generatePDFObjectKey(ebxVersion->value(),
-				 decryptedKey+RSA_KEY_SIZE-16, 16,
+				 decryptedKey+sizeof(decryptedKey)-16, 16,
 				 object->objectId(), object->generationNumber(),
 				 tmpKey);
 
@@ -1233,6 +1254,8 @@ namespace gourou
 				clearData, &dataOutLength);
 		
 		stream->setData(clearData, dataOutLength, true);
+		if (dataOutLength != dataLength)
+		    GOUROU_LOG(DEBUG, "New size " << dataOutLength);
 	    }
 	}
 
@@ -1243,11 +1266,11 @@ namespace gourou
     }
     
     void DRMProcessor::removeDRM(const std::string& filenameIn, const std::string& filenameOut,
-				 ITEM_TYPE type)
+				 ITEM_TYPE type, const unsigned char* encryptionKey, unsigned encryptionKeySize)
     {
 	if (type == PDF)
-	    removePDFDRM(filenameIn, filenameOut);
+	    removePDFDRM(filenameIn, filenameOut, encryptionKey, encryptionKeySize);
 	else
-	    removeEPubDRM(filenameIn, filenameOut);
+	    removeEPubDRM(filenameIn, filenameOut, encryptionKey, encryptionKeySize);
     }
 }

utils/adept_remove.cpp

@@ -55,6 +55,23 @@ static const char* defaultDirs[]  = {
     "./adobe-digital-editions/",
     "./.adobe-digital-editions/"
 };
+static char* encryptionKeyUser  = 0;
+static unsigned char* encryptionKey  = 0;
+static unsigned       encryptionKeySize  = 0;
+
+static inline unsigned char htoi(unsigned char c)
+{
+    if (c >= '0' && c <= '9')
+	c -= '0';
+    else if (c >= 'a' && c <= 'f')
+	c -= 'a' - 10;
+    else if (c >= 'A' && c <= 'F')
+	c -= 'A' - 10;
+    else
+	EXCEPTION(gourou::USER_INVALID_INPUT, "Invalid character " << c << " in encryption key");
+
+    return c;
+}
 
 static inline bool endsWith(const std::string& s, const std::string& suffix)
 {
@@ -110,7 +127,7 @@ public:
 		{
 		    EXCEPTION(gourou::DRM_FILE_ERROR, "Unable to copy " << inputFile << " into " << filename);
 		}
-		processor.removeDRM(inputFile, filename, type);
+		processor.removeDRM(inputFile, filename, type, encryptionKey, encryptionKeySize);
 		std::cout << "DRM removed into new file " << filename << std::endl;
 	    }
 	    else
@@ -121,7 +138,7 @@ public:
 		    QTemporaryFile tempFile;
 		    tempFile.open();
 		    tempFile.setAutoRemove(false); // In case of failure
-		    processor.removeDRM(inputFile, tempFile.fileName().toStdString(), type);
+		    processor.removeDRM(inputFile, tempFile.fileName().toStdString(), type, encryptionKey, encryptionKeySize);
 		    /* Original file must be removed before doing a copy... */
 		    QFile origFile(inputFile);
 		    origFile.remove();
@@ -132,7 +149,7 @@ public:
 		    tempFile.setAutoRemove(true);
 		}
 		else
-		    processor.removeDRM(inputFile, filename, type);
+		    processor.removeDRM(inputFile, filename, type, encryptionKey, encryptionKeySize);
 		std::cout << "DRM removed from " << filename << std::endl;
 	    }
 	} catch(std::exception& e)
@@ -213,14 +230,14 @@ int main(int argc, char** argv)
 	    {"output-dir",       required_argument, 0,  'O' },
 	    {"output-file",      required_argument, 0,  'o' },
 	    {"input-file",       required_argument, 0,  'f' },
-	    {"export-private-key",no_argument,      0,  'e' },
+	    {"encryption-key",   required_argument, 0,  'K' }, // Private option
 	    {"verbose",          no_argument,       0,  'v' },
 	    {"version",          no_argument,       0,  'V' },
 	    {"help",             no_argument,       0,  'h' },
 	    {0,                  0,                 0,  0 }
 	};
 
-	c = getopt_long(argc, argv, "d:a:k:O:o:f:evVh",
+	c = getopt_long(argc, argv, "d:a:k:O:o:f:K:vVh",
                         long_options, &option_index);
 	if (c == -1)
 	    break;
@@ -244,6 +261,9 @@ int main(int argc, char** argv)
 	case 'o':
 	    outputFile = optarg;
 	    break;
+	case 'K':
+	    encryptionKeyUser = optarg;
+	    break;
 	case 'v':
 	    verbose++;
 	    break;
@@ -286,6 +306,32 @@ int main(int argc, char** argv)
 	}
     }
 
+    if (encryptionKeyUser)
+    {
+	int size = std::string(encryptionKeyUser).size();
+	if ((size % 2))
+	{
+	    std::cout << "Error : Encryption key must be odd length" << std::endl;
+	    goto end;
+	}
+
+	if (encryptionKeyUser[0] == '0' && encryptionKeyUser[1] == 'x')
+	{
+	    encryptionKeyUser += 2;
+	    size -= 2;
+	}
+
+	encryptionKey = new unsigned char[size/2];
+
+	for(i=0; i<size; i+=2)
+	{
+	    encryptionKey[i/2]  = htoi(encryptionKeyUser[i]) << 4;
+	    encryptionKey[i/2] |= htoi(encryptionKeyUser[i+1]);
+	}
+
+	encryptionKeySize = size/2;
+    }
+    
     if (hasErrors)
 	goto end;
        
@@ -300,5 +346,8 @@ end:
 	    free((void*)*files[i]);
     }
 
+    if (encryptionKey)
+	free(encryptionKey);
+    
     return ret;
 }