iTextSharp.text.pdf.PdfPKCS7.SetExternalDigest C# (CSharp) Метод

        public void SetExternalDigest(byte[] digest, byte[] RSAdata, String digestEncryptionAlgorithm) {
            externalDigest = digest;
            externalRSAdata = RSAdata;
            if (digestEncryptionAlgorithm != null) {
                if (digestEncryptionAlgorithm.Equals("RSA")) {
                    this.digestEncryptionAlgorithm = ID_RSA;
                }
                else if (digestEncryptionAlgorithm.Equals("DSA")) {
                    this.digestEncryptionAlgorithm = ID_DSA;
                }
                else
                    throw new ArgumentException("Unknown Key Algorithm "+digestEncryptionAlgorithm);
            }
        }
        

 /**
  * Sets the crypto information to sign.
  * @param privKey the private key
  * @param certChain the certificate chain
  * @param crlList the certificate revocation list. It can be <CODE>null</CODE>
  */
 public void SetSignInfo(CipherParameters privKey, X509Certificate[] certChain, object[] crlList)
 {
     pkcs = new PdfPKCS7(privKey, certChain, crlList, hashAlgorithm, PdfName.ADBE_PKCS7_SHA1.Equals(Get(PdfName.SUBFILTER)));
     pkcs.SetExternalDigest(externalDigest, externalRSAdata, digestEncryptionAlgorithm);
     if (PdfName.ADBE_X509_RSA_SHA1.Equals(Get(PdfName.SUBFILTER)))
     {
         MemoryStream bout = new MemoryStream();
         for (int k = 0; k < certChain.Length; ++k)
         {
             byte[] tmp = certChain[k].getEncoded();
             bout.Write(tmp, 0, tmp.Length);
         }
         bout.Close();
         Cert     = bout.ToArray();
         Contents = pkcs.GetEncodedPKCS1();
     }
     else
     {
         Contents = pkcs.GetEncodedPKCS7();
     }
     name = PdfPKCS7.GetSubjectFields(pkcs.SigningCertificate).GetField("CN");
     if (name != null)
     {
         Put(PdfName.NAME, new PdfString(name, PdfObject.TEXT_UNICODE));
     }
     pkcs = new PdfPKCS7(privKey, certChain, crlList, hashAlgorithm, PdfName.ADBE_PKCS7_SHA1.Equals(Get(PdfName.SUBFILTER)));
     pkcs.SetExternalDigest(externalDigest, externalRSAdata, digestEncryptionAlgorithm);
 }