添加 PDF 撤销信息作为签名属性 pdfRevocationInfoArchival OID 1.2.840.113583.1.1.8

Question

We have added pdfRevocationInfoArchival OID (1.2.840.113583.1.1.8) as a signed attribute while generating signature. While building this attribute we used external CRL file (ca-crl.crl) and builds the OID 1.2.840.113583.1.1.8 as ASN1 object. After signing pdf and timestamping signature, everything works fine. But we are not able to understand the identifier (adbe-revocationInfoArchival) which added is in the PDF is correct and which can be used to verify this PDF by fetching this OID. Also we are not able to check that this attribute is in proper format in which PDF can verify it. Is there any tool or utility available to check this attribute which is inserted as a signed attribute is valid.

If any PDF tool/utility is available to visualize attribute are available in PDF please share.

We have build the issuers CRL info at position [0] is this correct to way add the CRL in this OID? I have share the code below code snippet

以下对象标识符标识 Adobe 的吊销信息属性：

adbe-revocationInfoArchival OBJECT IDENTIFIER ::=
        { adbe(1.2.840.113583) acrobat(1) security(1) 8 }

Adobe 的吊销信息属性值具有 ASN.1 类型 RevocationInfoArchival:

    /**
     ** RevocationInfoArchival ::= SEQUENCE {
     **   crl [0] EXPLICIT SEQUENCE of CRLs, OPTIONAL
     **   ocsp [1] EXPLICIT SEQUENCE of OCSP Responses, OPTIONAL
     **   otherRevInfo [2] EXPLICIT SEQUENCE of OtherRevInfo, OPTIONAL
      }
    */

在 Java Bouncy Castle 中使用的 Adobe 吊销信息属性值构建 API:

private ASN1EncodableVector genPdfInfoArchival(ASN1EncodableVector v) {
        
        ASN1EncodableVector v1 = new ASN1EncodableVector();
        
        List<X509CRL> crls = new ArrayList<X509CRL>();
        ASN1InputStream t = null;
        try {
            
            CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
            CRL crl = certFactory.generateCRL(new FileInputStream(new File("e://app//esp//crl//NSDLe-GovCA2019-Test-2.crl")));
            System.out.println("crl:" + crl);
            crls.add((X509CRL)crl);
            
            if (!crls.isEmpty()) {
                ASN1EncodableVector v11 = new ASN1EncodableVector();
                for (Iterator<X509CRL> i = crls.iterator(); i.hasNext();) {
                    t = new ASN1InputStream(new ByteArrayInputStream(i.next().getEncoded()));
                    v11.add(t.readObject());
                }
                //0 for CRL
                v1.add(new DERTaggedObject(true, 0, new DERSequence(v11)));
            }
} 
        
        return v1;}

After building OID adding it in SignerInforGeneratorBuilder as a signed attribute and generating the signature and then adding this signature in PDF

            CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
            ASN1EncodableVector signedAttr = new ASN1EncodableVector();
            String ID_ADBE_REVOCATION = "1.2.840.113583.1.1.8";

            //TODO add message digest for sgning - nikhilW
            Attribute attr = new Attribute(CMSAttributes.messageDigest,  new DERSet(new DEROctetString(IOUtils.toByteArray(hashdata))));
            signedAttr.add(attr);
            
            //TODO generate pdf info archival and add it as CMS signed attribute - nikhilW
            ASN1EncodableVector pdfInfo = genPdfInfoArchival(signedAttr);
            Attribute ar = new Attribute(new ASN1ObjectIdentifier(ID_ADBE_REVOCATION),   new DERSet (new DERSequence(pdfInfo)));
            signedAttr.add(ar);
            
            List<Certificate> certList = new ArrayList<Certificate>();
            certList.addAll(Arrays.asList(certificateChain));
            Store certs = new JcaCertStore(certList);
            
            DefaultSignedAttributeTableGenerator sa = new DefaultSignedAttributeTableGenerator(new AttributeTable(signedAttr));
            SignerInfoGeneratorBuilder builder = new SignerInfoGeneratorBuilder(new BcDigestCalculatorProvider());
            
            builder.setSignedAttributeGenerator(sa);

Please find below google drive link contains sample signed pdf file hello_signed_ts_pdfarchivalinfo.pdf
pdf_sample_signed

如有任何帮助，我们将不胜感激。

Answer 1

我已经使用下面的 java 源代码检查了在 pdf 中添加的属性。还有一个 iText Java 实用程序，它将调试 pdf 对象树 iText RUP or download it from my google drive link Download iTextRUP Java Jar 运行它与 java -jar jar-name 可能会帮助调试 pdf 对象。

Pdf 档案信息检索源代码 Returns CRL 流对象在位置 [0]

private void getPdfRevoInfoArch(SignerInformation signerInform) {
        
        AttributeTable at = signerInform.getSignedAttributes();
        
        ASN1Encodable arch =    at.get(new ASN1ObjectIdentifier("1.2.840.113583.1.1.8")).getAttrValues().getObjectAt(0);
        
        //ASN1Encodable arch1 = at.get(new ASN1ObjectIdentifier("1.2.840.113583.1.1.8")).getAttrValues().getObjectAt(1);
                
        System.out.println("arc:" + arch);
        System.out.println("archSize:" + at.get(new ASN1ObjectIdentifier("1.2.840.113583.1.1.8")).getAttrValues().size());
        
    }

添加 PDF 撤销信息作为签名属性 pdfRevocationInfoArchival OID 1.2.840.113583.1.1.8

Adding PDF revocation information as an signed attribute pdfRevocationInfoArchival OID 1.2.840.113583.1.1.8

java

pdf

cryptography

signing