java.security.InvalidKeyException: 没有安装的提供者支持这个密钥。(null)，而验证签名的pdf

Question

我得到这个异常

PdfPKCS7 pkcs7 = fields.verifySignature(name);

这是完整的代码

import com.itextpdf.text.pdf.AcroFields;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.security.PdfPKCS7;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.ArrayList;

public class NewClass {

    public static void main(String arg[])
            throws IOException, GeneralSecurityException {
        String path = "C:/Akshay/output.pdf";
        System.out.println(path);
        PdfReader reader = new PdfReader(path);
        AcroFields fields = reader.getAcroFields();
        ArrayList<String> names = fields.getSignatureNames();
        for (String name : names) {
            System.out.println("===== " + name + " =====");
            verifySignature(fields, name);
        }
        System.out.println();
    }

    public static void verifySignature(AcroFields fields, String name)
            throws GeneralSecurityException, IOException {
        System.out.println("Signature covers whole document: "
                + fields.signatureCoversWholeDocument(name));
        System.out.println("Document revision: " + fields.getRevision(name)
                + " of " + fields.getTotalRevisions());
        PdfPKCS7 pkcs7 = fields.verifySignature(name);
        System.out.println("Integrity check OK? " + pkcs7.verify());

    }

}

所用的jar.itextpdf-5.5.13.jar

1. itextpdf-5.5.13.jar
2. bcprov-jdk14-1.49.jar。

Answer 1

你应该添加一个像BouncyCastle这样的提供者，并添加下面的例子中的调用。

首先添加提供者

Security.addProvider(new BouncyCastleProvider());

然后添加提供者以获得签名

PdfPKCS7 pkcs7 = fields.verifySignature(name,"BC");