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Quellcode

// Encode the original data with RSA private key
        byte[] encodedBytes = null;
        try {
            Cipher c = Cipher.getInstance("RSA");
            c.init(Cipher.ENCRYPT_MODE, privateKey);
            encodedBytes = c.doFinal(theTestText.getBytes());
        } catch (Exception e) {
            Logfile.print("RSA encryption error");
        }
        TextView tvencoded = (TextView) findViewById(R.id.textView2Verschluesselt);
        tvencoded.setText("[ENCODED]:\n" +
                Base64.encodeToString(encodedBytes, Base64.DEFAULT) + "\n");

        // Decode the encoded data with RSA public key
        byte[] decodedBytes = null;
        try {
            Cipher c = Cipher.getInstance("RSA");
            c.init(Cipher.DECRYPT_MODE, publicKey);
            decodedBytes = c.doFinal(encodedBytes);
        } catch (Exception e) {
            Logfile.print("RSA decryption error");

        }

        String entschluesseltText = Base64.encodeToString(decodedBytes, Base64.DEFAULT);

        Toast.makeText(MainActivity.this, entschluesseltText, Toast.LENGTH_LONG).show();