问自签名被应用以来，单据已被更改或波纹，文本5.5.11

EN

    public static final String src = "DynamicClient\sample.pdf";
    public static final String temp= "DynamicClient\sampleTEMP.pdf";
    public static final String dest= "DynamicClient\sampleFINAL.pdf";

    public static void emptySignatureSVC(String src, String dest, String fieldname, Certificate[] chain) throws IOException, DocumentException, GeneralSecurityException {
            PdfReader reader = new PdfReader(src);
            reader.setAppendable(true);
            FileOutputStream os = new FileOutputStream(dest);
            PdfStamper stamper = PdfStamper.createSignature(reader, os, '\0',null,true);
            PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
            appearance.setVisibleSignature(new Rectangle(0, 0, 0, 0), 1, fieldname);
            appearance.setCertificate(chain[0]);
            ExternalSignatureContainer external = new ExternalBlankSignatureContainer(PdfName.ADOBE_PPKLITE, PdfName.ETSI_CADES_DETACHED);
            MakeSignature.signExternalContainer(appearance, external, 8192);
            reader.close();
            
        }

    public static void createSignatureSVC(String src, String dest, String fieldname, byte[] sign, Certificate[] chain) throws IOException, DocumentException, GeneralSecurityException {
            
            PdfReader reader = new PdfReader(src);
            FileOutputStream os = new FileOutputStream(dest);
            ExternalSignatureContainer external = new MyExternalSignatureContainer(sign, chain);
            MakeSignature.signDeferred(reader, fieldname, os, external);
        }


    public static void main(String[] args) throws Exception {

                Certificate[] chain = signWS.getChain();//External WS to get chain
                emptySignatureSVC(src, temp, "signature", chain);               
                InputStream is = new FileInputStream(new File(temp));
                PdfPKCS7 sgn = new PdfPKCS7(null, chain, "SHA256", null, digest, false);
                byte[] hash = DigestAlgorithms.digest(is, digest.getMessageDigest("SHA256"));
                byte[] sh = sgn.getAuthenticatedAttributeBytes(hash, null, null, CryptoStandard.CADES);
                
                byte[] extSignature = signWS(sh);//External WS to sign
                sgn.setExternalDigest(extSignature, null, "RSA");
    
                createSignatureSVC(temp, dest, "signature", sgn.getEncodedPKCS7(hash,null, null, null, CryptoStandard.CADES), chain);
}

class MyExternalSignatureContainer implements ExternalSignatureContainer {
    protected byte[] sig;
    protected Certificate[] chain;
    public MyExternalSignatureContainer(byte[] sig,Certificate[] chain) {
        this.sig = sig;
        this.chain=chain;
    }
    public byte[] sign(InputStream is)throws GeneralSecurityException  {
        
        return sig;
        
    }

    @Override
    public void modifySigningDictionary(PdfDictionary signDic) {
        // TODO Auto-generated method stub
        
    }
}