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Thread: Encryption

  1. #1
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    Default Encryption

    I'm currently struggling on sealing objects for an inherited class and was wondering if anyone here could help.


  2. #2
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    Default Re: Encryption

    How do I use this code with a fixed key instead of a generated key?

    public static void main(String[] args) throws Exception {
     
    	Security.addProvider(new FlexiCoreProvider());
     
    	Cipher cipher = Cipher.getInstance("AES128_CBC", "FlexiCore");
    	KeyGenerator keyGen = KeyGenerator.getInstance("AES", "FlexiCore");
    	SecretKey secKey = keyGen.generateKey();
            System.out.println(secKey);
     
    	// Encrypt
     
    	cipher.init(Cipher.ENCRYPT_MODE, secKey);
     
    	String cleartextFile = "cleartextFile.txt";
    	String ciphertextFile = "ciphertextFile.txt";
     
    	FileInputStream fis = new FileInputStream(cleartextFile);
    	FileOutputStream fos = new FileOutputStream(ciphertextFile);
    	CipherOutputStream cos = new CipherOutputStream(fos, cipher);
     
    	byte[] block = new byte[8];
    	int i;
    	while ((i = fis.read(block)) != -1) {
    	    cos.write(block, 0, i);
    	}
    	cos.close();
     
    	// Decrypt
     
    	String cleartextAgainFile = "cleartextAgainFile.txt";
     
    	cipher.init(Cipher.DECRYPT_MODE, secKey);
     
    	fis = new FileInputStream(ciphertextFile);
    	CipherInputStream cis = new CipherInputStream(fis, cipher);
    	fos = new FileOutputStream(cleartextAgainFile);
     
    	while ((i = cis.read(block)) != -1) {
    	    fos.write(block, 0, i);
    	}
    	fos.close();
        }

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