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

        public PdfPKCS7(ICipherParameters privKey, ICollection<X509Certificate> certChain, 
            String hashAlgorithm, bool hasRSAdata)
        {
            digestAlgorithmOid = DigestAlgorithms.GetAllowedDigests(hashAlgorithm);
            if (digestAlgorithmOid == null)
                throw new ArgumentException(MessageLocalization.GetComposedMessage("unknown.hash.algorithm.1", hashAlgorithm));

            version = signerversion = 1;
            certs = new List<X509Certificate>(certChain);
            crls = new List<X509Crl>();
            digestalgos = new Dictionary<string,object>();
            digestalgos[digestAlgorithmOid] = null;

            //
            // Copy in the certificates and crls used to sign the private key.
            //
            signCert = certs[0];

            if (privKey != null) {
                //
                // Now we have private key, find out what the digestEncryptionAlgorithm is.
                //
                if (privKey is RsaKeyParameters)
                    digestEncryptionAlgorithmOid = SecurityIDs.ID_RSA;
                else if (privKey is DsaKeyParameters)
                    digestEncryptionAlgorithmOid = SecurityIDs.ID_DSA;
                else
                    throw new ArgumentException(MessageLocalization.GetComposedMessage("unknown.key.algorithm.1", privKey.ToString()));

            }
            if (hasRSAdata) {
                RSAdata = new byte[0];
                messageDigest = GetHashClass();
            }

            if (privKey != null) {
                sig = SignerUtilities.GetSigner(GetDigestAlgorithm());
                sig.Init(true, privKey);
            }
        }