Opc.Ua.UserNameIdentityToken.Decrypt C# (CSharp) Method

        public override void Decrypt(X509Certificate2 certificate, byte[] senderNonce, string securityPolicyUri)
        {
            // handle no encryption.
            if (String.IsNullOrEmpty(securityPolicyUri) || securityPolicyUri == SecurityPolicies.None)
            {
                m_decryptedPassword = new UTF8Encoding().GetString(m_password, 0, m_password.Length);
                return;
            }
            
            // decrypt.
            EncryptedData encryptedData = new EncryptedData();

            encryptedData.Data = m_password;
            encryptedData.Algorithm = m_encryptionAlgorithm;

            byte[] decryptedPassword = SecurityPolicies.Decrypt(
                certificate, 
                securityPolicyUri, 
                encryptedData);

            if (decryptedPassword == null)
            {
                m_decryptedPassword = null;
                return;
            }

            // verify the sender's nonce.
            int startOfNonce = decryptedPassword.Length;

            if (senderNonce != null)
            {
                 startOfNonce -= senderNonce.Length;

                for (int ii = 0; ii < senderNonce.Length; ii++)
                {
                    if (senderNonce[ii] != decryptedPassword[ii+startOfNonce])
                    {
                        throw new ServiceResultException(StatusCodes.BadIdentityTokenRejected);
                    }
                }
            }            
                     
            // convert to UTF-8.
            m_decryptedPassword = new UTF8Encoding().GetString(decryptedPassword, 0, startOfNonce);
        }
        #endregion