使用iTextPdf验证PDF包含的证书是否有效

• itextpdf-5.5.10.jar
• bcpkix-jdk15on-1.49.jar
  缺少会报错：java.lang.NoClassDefFoundError: org/bouncycastle/cert/X509CertificateHolder
• bcprov-jdk15on-152.jar
  org.bouncycastle.jce.provider.BouncyCastleProvider的来源

public static boolean verifySignature(String filepath) throws GeneralSecurityException, IOException {
    Security.addProvider(new BouncyCastleProvider());
    PdfReader reader = new PdfReader(filepath);
    AcroFields fields = reader.getAcroFields();
    ArrayList names = fields.getSignatureNames();
    for (String name : names) {
        PdfPKCS7 pkcs7 = fields.verifySignature(name, "BC");
        if(!pkcs7.verify())
            return false;
    }
    return true;
}

之前使用了bcprov-jdk15on-170.jar包，出现一下报错：

java.lang.ClassCastException: org.bouncycastle.asn1.DLTaggedObject cannot be cast to org.bouncycastle.asn1.DERTaggedObject
	at org.bouncycastle.asn1.tsp.TSTInfo.(Unknown Source)
	at org.bouncycastle.asn1.tsp.TSTInfo.getInstance(Unknown Source)
	at org.bouncycastle.tsp.TimeStampToken.(Unknown Source)
	at org.bouncycastle.tsp.TimeStampToken.(Unknown Source)
	at com.itextpdf.text.pdf.security.PdfPKCS7.(PdfPKCS7.java:402)
	at com.itextpdf.text.pdf.AcroFields.verifySignature(AcroFields.java:2419)

可以通过maven查看itextpdf对应的bcprov的jar包(https://mvnrepository.com/artifact/com.itextpdf/itextpdf/5.5.10)

THE END ✿✿ヽ(°▽°)ノ✿