使用 IText 7 将数字签名添加到 PDF

对于 IText 5，添加数字签名相当容易。 其文档的链接是：http://developers.itextpdf.com/examples/security/digital-signatures-white-paper/digital-signatures-chapter-2 http://developers.itextpdf.com/examples/security/digital-signatures-white-paper/digital-signatures-chapter-2

有人可以分享 ITEXT 7 中这样做的文档链接吗？ 我尝试了各种方法都没有效果。无法在网上找到任何链接。我可以取消签名并检查签名，但无法添加它。

数字签名白皮书代码示例到 iText 7 的移植可以在iText 7 Java 签名示例 github 存储库 https://github.com/itext/i7js-signatures测试源包com.itextpdf.samples.signatures https://github.com/itext/i7js-signatures/tree/develop/src/test/java/com/itextpdf/samples/signatures，例如简单的摘录C2_01_SignHelloWorld https://github.com/itext/i7js-signatures/blob/develop/src/test/java/com/itextpdf/samples/signatures/chapter02/C2_01_SignHelloWorld.java例子：

public void sign(String src, String dest,
                 Certificate[] chain,
                 PrivateKey pk, String digestAlgorithm, String provider,
                 PdfSigner.CryptoStandard subfilter,
                 String reason, String location)
        throws GeneralSecurityException, IOException {
    // Creating the reader and the signer
    PdfReader reader = new PdfReader(src);
    PdfSigner signer = new PdfSigner(reader, new FileOutputStream(dest), false);
    // Creating the appearance
    PdfSignatureAppearance appearance = signer.getSignatureAppearance()
            .setReason(reason)
            .setLocation(location)
            .setReuseAppearance(false);
    Rectangle rect = new Rectangle(36, 648, 200, 100);
    appearance
            .setPageRect(rect)
            .setPageNumber(1);
    signer.setFieldName("sig");
    // Creating the signature
    IExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, provider);
    IExternalDigest digest = new BouncyCastleDigest();
    signer.signDetached(digest, pks, chain, null, null, null, 0, subfilter);
}