Opc.Ua.Bindings.TcpChannel.Decrypt C# (CSharp) Method

TcpChannel Class Documentation ファイルを表示 Open project: OPCFoundation/UA-.NETStandardLibrary

Decrypt() protected method

Decrypts the buffer using asymmetric encryption.

Start and count specify the block of data to be decrypted. The header specifies unencrypted data that must be copied to the output.

protected Decrypt ( ArraySegment dataToDecrypt, ArraySegment headerToCopy, X509Certificate2 receiverCertificate ) : ArraySegment
dataToDecrypt	ArraySegment
headerToCopy	ArraySegment
receiverCertificate	System.Security.Cryptography.X509Certificates.X509Certificate2
return	ArraySegment

        protected ArraySegment<byte> Decrypt(
            ArraySegment<byte> dataToDecrypt,
            ArraySegment<byte> headerToCopy,
            X509Certificate2   receiverCertificate)
        {
            switch (SecurityPolicyUri)
            {
                default:
                case SecurityPolicies.None:
                {
                    byte[] decryptedBuffer = BufferManager.TakeBuffer(SendBufferSize, "Decrypt");

                    Array.Copy(headerToCopy.Array, headerToCopy.Offset, decryptedBuffer, 0, headerToCopy.Count);
                    Array.Copy(dataToDecrypt.Array, dataToDecrypt.Offset, decryptedBuffer, headerToCopy.Count, dataToDecrypt.Count);

                    return new ArraySegment<byte>(decryptedBuffer, 0, dataToDecrypt.Count+headerToCopy.Count);
                }
                case SecurityPolicies.Basic256:
                case SecurityPolicies.Basic256Sha256:
                {
                    return Rsa_Decrypt(dataToDecrypt, headerToCopy, receiverCertificate, true);
                }

                case SecurityPolicies.Basic128Rsa15:
                {
                    return Rsa_Decrypt(dataToDecrypt, headerToCopy, receiverCertificate, false);
                }
            }
        }
#endregion