Opc.Ua.Bindings.TcpChannel.ComputeKeys C# (CSharp) Метод

        protected void ComputeKeys(TcpChannelToken token)
        {        
            if (SecurityMode == MessageSecurityMode.None)
            {
                return;
            }

            if (SecurityPolicyUri == SecurityPolicies.Basic256Sha256)
            {
                token.ClientSigningKey = Utils.PSHA256(token.ServerNonce, null, token.ClientNonce, 0, m_signatureKeySize);
                token.ClientEncryptingKey = Utils.PSHA256(token.ServerNonce, null, token.ClientNonce, m_signatureKeySize, m_encryptionKeySize);
                token.ClientInitializationVector = Utils.PSHA256(token.ServerNonce, null, token.ClientNonce, m_signatureKeySize + m_encryptionKeySize, m_encryptionBlockSize);
                token.ServerSigningKey = Utils.PSHA256(token.ClientNonce, null, token.ServerNonce, 0, m_signatureKeySize);
                token.ServerEncryptingKey = Utils.PSHA256(token.ClientNonce, null, token.ServerNonce, m_signatureKeySize, m_encryptionKeySize);
                token.ServerInitializationVector = Utils.PSHA256(token.ClientNonce, null, token.ServerNonce, m_signatureKeySize + m_encryptionKeySize, m_encryptionBlockSize);
            }
            else
            {
                token.ClientSigningKey = Utils.PSHA1(token.ServerNonce, null, token.ClientNonce, 0, m_signatureKeySize);
                token.ClientEncryptingKey = Utils.PSHA1(token.ServerNonce, null, token.ClientNonce, m_signatureKeySize, m_encryptionKeySize);
                token.ClientInitializationVector = Utils.PSHA1(token.ServerNonce, null, token.ClientNonce, m_signatureKeySize + m_encryptionKeySize, m_encryptionBlockSize);
                token.ServerSigningKey = Utils.PSHA1(token.ClientNonce, null, token.ServerNonce, 0, m_signatureKeySize);
                token.ServerEncryptingKey = Utils.PSHA1(token.ClientNonce, null, token.ServerNonce, m_signatureKeySize, m_encryptionKeySize);
                token.ServerInitializationVector = Utils.PSHA1(token.ClientNonce, null, token.ServerNonce, m_signatureKeySize + m_encryptionKeySize, m_encryptionBlockSize);
            }

            switch (SecurityPolicyUri)
            {
                case SecurityPolicies.Basic128Rsa15:
                case SecurityPolicies.Basic256:
                case SecurityPolicies.Basic256Sha256:
                    {
                        // create encryptors. 
                        SymmetricAlgorithm AesCbcEncryptorProvider = Aes.Create();
                        AesCbcEncryptorProvider.Mode = CipherMode.CBC;
                        AesCbcEncryptorProvider.Padding = PaddingMode.None;
                        AesCbcEncryptorProvider.Key = token.ClientEncryptingKey;
                        AesCbcEncryptorProvider.IV = token.ClientInitializationVector;
                        token.ClientEncryptor = AesCbcEncryptorProvider;

                        SymmetricAlgorithm AesCbcDecryptorProvider = Aes.Create();
                        AesCbcDecryptorProvider.Mode = CipherMode.CBC;
                        AesCbcDecryptorProvider.Padding = PaddingMode.None;
                        AesCbcDecryptorProvider.Key = token.ServerEncryptingKey;
                        AesCbcDecryptorProvider.IV = token.ServerInitializationVector;
                        token.ServerEncryptor = AesCbcDecryptorProvider;

                        // create HMACs.
                        if (SecurityPolicyUri == SecurityPolicies.Basic256Sha256)
                        {
                            // SHA256
                            token.ServerHmac = new HMACSHA256(token.ServerSigningKey);
                            token.ClientHmac = new HMACSHA256(token.ClientSigningKey);
                        }
                        else
                        {   // SHA1
                            token.ServerHmac = new HMACSHA1(token.ServerSigningKey);
                            token.ClientHmac = new HMACSHA1(token.ClientSigningKey);
                        }
                        break;
                    }

                default:
                case SecurityPolicies.None:             
                    {
                        break;
                    }
            }            
        }