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）：

---

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，即使用您要查找的文本中的。

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。

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
 */

---

使用

iText7

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
 */