API to get device certificate.
It can be used to encrypt important data like AES encrypt key.
This API should be called every time when encrypt key is needed.

     
     MPOSPolicy mpospolicy = getInstance(Context);
     byte[] certChain = mMPOSPolicy.getCertificateChain();

     int index = 0;
     //root_certificate_buffer_length
     byte[] root_certificate_buffer_length_bytes = Arrays.copyOfRange(certChain, index, index + CERT_LENGTH_BYTE);
     index = index + CERT_LENGTH_BYTE;

     int root_certificate_buffer_length = convertByteArrayToInt(root_certificate_buffer_length_bytes);
     ByteBuffer data1 = ByteBuffer.allocate(CERT_LENGTH_BYTE);
     data1.order(ByteOrder.LITTLE_ENDIAN);
     data1.putInt(root_certificate_buffer_length);
     root_certificate_buffer_length_bytes = data1.array();
     root_certificate_buffer_length  = convertByteArrayToInt(root_certificate_buffer_length_bytes);

     //root_certificate
     byte[] root_certificate = Arrays.copyOfRange(certChain, index, index + root_certificate_buffer_length);
     //Device root certificate used to derive client certificate
     X509Certificate rootCert = byteToX509Certificate(root_certificate);
     index = index + root_certificate_buffer_length;

     //leaf_certificate_buffer_length
     byte[] leaf_certificate_buffer_length_bytes = Arrays.copyOfRange(certChain, index, index + CERT_LENGTH_BYTE);
     index = index + CERT_LENGTH_BYTE;
     int leaf_cert_length = convertByteArrayToInt(leaf_certificate_buffer_length_bytes);
     ByteBuffer data2 = ByteBuffer.allocate(4);
     data2.order(ByteOrder.LITTLE_ENDIAN);
     data2.putInt(leaf_cert_length);
     leaf_certificate_buffer_length_bytes = data2.array();
     leaf_cert_length = convertByteArrayToInt(leaf_certificate_buffer_length_bytes);

     //leaf_certificate
     byte[] leaf_certificate = Arrays.copyOfRange(certChain, index, index + leaf_cert_length);
     //You should use leaf_cert (X509Certificate driven from Samsung device root key) to encrypt your symmetric key.
     X509Certificate leafCert = byteToX509Certificate(leaf_certifcate);
     
 

API to get the MPOSPolicy instance.

API to check whether the Knox POS SDK is supported or not.

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API to show TUI View based on layout with dynamic String.