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PDF Timestamping

โปรเจกต์ PDFTimestamping เป็นโปรเจคสำหรับทำ Timestamp บนไฟล์ PDF ที่ถูกพัฒนาด้วยภาษา JAVA โดยใช้ Library PDFBox ในการเรียก TSAClient จาก TSA (Time-Stamp Authority)

นอกจาก source code ตัวอย่างในการทำ Timestamp ทาง สพธอ. ยังมีการให้บริการ TSA ด้วย โดยสามารถติดต่อขอรับการใช้บริการได้ทางเบอร์โทรศัพท์ 02-123-1234

Prerequisites

  • JDK 1.8
  • Eclipse Oxygen with Maven

Maven Dependencies

  • Apache PDFBox 2.0.15
  • Bouncy Castle 1.59

Getting started

PDF Timestamping with username and password

/* Set TSA Parameter (Username , Password authen)
* tsaUrl : TSA URL (ex. "http://test.time.teda.th") 
* tsaUsername : TSA login username
* tsaPassword : TSA login password
*/
CreateSignedTimeStamp signing = new CreateSignedTimeStamp(tsaUrl,tsaUsername,tsaPassword);

/* Set Input Instance  */
File inFile = new File(inputFile);
String name = inFile.getName();
String substring = name.substring(0, name.lastIndexOf('.'));

/* Set Output Instance */
File outFile = new File(inFile.getParent(), substring + "_timestamped.pdf");

/* Do Timestaping */
signing.signDetached(inFile, outFile);

PDF Timestamping with certificate authentication

/*Set TSA Parameter (Certificate authen)
* tsaUrl : TSA URL (ex. "https://test.time.teda.th") 
* keystoreFile : Keystore File (ex.Keystore.p12)
* keystorePassword : Keystore file password
* keystoreType : Keystore type (ex. PKCS12)
* LogType : Log type (LogType support only "1" or "2" (for Console log, WriteLogFile) ex."1")
*/
CreateSignedTimeStamp signing = new CreateSignedTimeStamp(tsaUrl,keystoreFile,keystorePassword,keystoreType,LogType);

/*Set Input Instance*/  
File inFile = new File(inputFile);
String name = inFile.getName();
String substring = name.substring(0, name.lastIndexOf('.'));

/*Set Output Instance*/
File outFile = new File(inFile.getParent(), substring + "_timestamped.pdf");

/*Do Timestaping*/
signing.signDetached(inFile, outFile);

Timestamp Client

/*
* If Timestamp for PDF is not your choice here are guidance for TSAClient calling only 
*/		

/*Create MD5 Instance with SHA-256 Algorithm*/
MessageDigest digest = MessageDigest.getInstance("SHA-256");
	
/*Create TSAClient for certificate authen (we modified TSAClent class to support certificate authen method)*/
TSAClient clientCert = new TSAClient(new URL(tsaUrl),keystoreFile,keystorePassword,keystoreType,digest);
	
/*Create TSAClient for username and password ( modified TSAClent class to support certificate authen method)*/
//TSAClient clientUsername = new TSAClient(new URL(tsaUrl),username, password, digest);

/*Example data directly from byte*/
byte[] data = "testcontent".getBytes("UTF-8");		
	
/*get TimeStampToken*/ 
byte[] clientByte =  clientCert.getTimeStampToken(messageDigest);