Java 如何在没有数字签名的情况下添加时间戳
我想在我的PDF文档中添加时间戳(无数字签名)。我该怎么做 我可以使用Itext进行数字签名(我这里有一个客户端):Java 如何在没有数字签名的情况下添加时间戳,java,itext,bouncycastle,pdfbox,Java,Itext,Bouncycastle,Pdfbox,我想在我的PDF文档中添加时间戳(无数字签名)。我该怎么做 我可以使用Itext进行数字签名(我这里有一个客户端): 但是,如果没有数字签名,如何做类似的事情呢?使用Bouncy Castle或Itext或Pdfbox。。。或者使用另一个库..在您要查找的文本中 LtvTimestamp.timestamp(appearance, tsa, signatureName); 另请参阅JavaDoc文档: /** * Signs a document with a PAdES-LTV Times
但是,如果没有数字签名,如何做类似的事情呢?使用Bouncy Castle或Itext或Pdfbox。。。或者使用另一个库..在您要查找的文本中
LtvTimestamp.timestamp(appearance, tsa, signatureName);
另请参阅JavaDoc文档:
/**
* Signs a document with a PAdES-LTV Timestamp. The document is closed at the end.
* @param sap the signature appearance
* @param tsa the timestamp generator
* @param signatureName the signature name or null to have a name generated
* automatically
* @throws DocumentException
* @throws IOException
* @throws GeneralSecurityException
*/
您可能需要阅读第5.4.1节,在中添加文档安全存储(DSS)和文档级时间戳,以便在上下文中使用
请注意,旧的PDF查看器无法正确识别文档级别的时间戳,因为它们是最近才进入PDF世界的,即。要使用PDFBox实现这一点,您需要一些简单的SignatureInterface实现,如下所示:
public class TimestampSignatureImpl implements SignatureInterface {
private TSAClient tsaClient;
public TimestampSignatureImpl(TSAClient tsaClient) {
super();
this.tsaClient = tsaClient;
}
@Override
public byte[] sign(InputStream paramInputStream) throws IOException {
return tsaClient.getTimeStampToken(IOUtils.toByteArray(paramInputStream));
}
}
PDSignature signature = new PDSignature();
signature.setFilter(PDSignature.FILTER_ADOBE_PPKLITE);
signature.setSubFilter(COSName.getPDFName("ETSI.RFC3161"));
signature.setSignDate(Calendar.getInstance());
PDDocument pdf = PDDocument.load(inputFile);
MessageDigest digest = MessageDigest.getInstance("SHA-256");
TSAClient tsaClient = new TSAClient(new URL("your time stamp authority"), null, null, digest);
pdf.addSignature(signature, new TimestampSignatureImpl(tsaClient));
pdf.saveIncremental(new FileOutputStream(outputFile));
pdf.close();
还有一些像这样的签名:
public class TimestampSignatureImpl implements SignatureInterface {
private TSAClient tsaClient;
public TimestampSignatureImpl(TSAClient tsaClient) {
super();
this.tsaClient = tsaClient;
}
@Override
public byte[] sign(InputStream paramInputStream) throws IOException {
return tsaClient.getTimeStampToken(IOUtils.toByteArray(paramInputStream));
}
}
PDSignature signature = new PDSignature();
signature.setFilter(PDSignature.FILTER_ADOBE_PPKLITE);
signature.setSubFilter(COSName.getPDFName("ETSI.RFC3161"));
signature.setSignDate(Calendar.getInstance());
PDDocument pdf = PDDocument.load(inputFile);
MessageDigest digest = MessageDigest.getInstance("SHA-256");
TSAClient tsaClient = new TSAClient(new URL("your time stamp authority"), null, null, digest);
pdf.addSignature(signature, new TimestampSignatureImpl(tsaClient));
pdf.saveIncremental(new FileOutputStream(outputFile));
pdf.close();
然后按如下方式签署您的pdf:
public class TimestampSignatureImpl implements SignatureInterface {
private TSAClient tsaClient;
public TimestampSignatureImpl(TSAClient tsaClient) {
super();
this.tsaClient = tsaClient;
}
@Override
public byte[] sign(InputStream paramInputStream) throws IOException {
return tsaClient.getTimeStampToken(IOUtils.toByteArray(paramInputStream));
}
}
PDSignature signature = new PDSignature();
signature.setFilter(PDSignature.FILTER_ADOBE_PPKLITE);
signature.setSubFilter(COSName.getPDFName("ETSI.RFC3161"));
signature.setSignDate(Calendar.getInstance());
PDDocument pdf = PDDocument.load(inputFile);
MessageDigest digest = MessageDigest.getInstance("SHA-256");
TSAClient tsaClient = new TSAClient(new URL("your time stamp authority"), null, null, digest);
pdf.addSignature(signature, new TimestampSignatureImpl(tsaClient));
pdf.saveIncremental(new FileOutputStream(outputFile));
pdf.close();
注意:TSAClient取自PDFBox示例。使用
iText7
您可以通过调用PdfSigner
类的以下方法添加DTS
(文档时间戳)
ITSAClient tsa = new TSAClientBouncyCastle(tsaUrl, tsaUser, tsaPass);
pdfSigner.timestamp(tsa, "SignatureTimeStamp");
或
还有java文档
/**
* Signs a document with a PAdES-LTV Timestamp. The document is closed at the end.
* NOTE: This method closes the underlying pdf document. This means, that current instance
* of PdfSigner cannot be used after this method call.
*
* @param tsa the timestamp generator
* @param signatureName the signature name or null to have a name generated
* automatically
* @throws IOException
* @throws GeneralSecurityException
*/