not decrypting what I crypted

Question

I have a weird problem...

Basing my solution on Decrypting a hardcoded file as byte[]

So, I wrote a small Cypher class to help out with crypting/decrypting..

Answer 1

I think the problem is here:

//opentext
System.out.println("checking PEM...");
crypted = Base64Coder.encode(getBytesFromFile(cryptoPEM));

Previously, you wrote char[] to the file, but now you're reading a byte[] from the file and re-encoding in base64. The file's contents should already be base64-encoded!

You need a new function called getCharsFromFile that returns char[] or String and pass that directly to decrypt2.

Answer 2

After reviewing the code this morning and tweaking a little bit I got it to work.

public static byte[] encrypt2(byte[] value) throws GeneralSecurityException, IOException
{
    SecretKeySpec key1 = getSecretKeySpec(true);
    System.err.println("encrypt():\t" + key1.toString());
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, key1, cipher.getParameters());
    byte[] encrypted = cipher.doFinal(value);

    SecretKeySpec key2 = getSecretKeySpec(false);
    System.err.println("encrypt():\t" + key2.toString());
    cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    cipher.init(Cipher.ENCRYPT_MODE, key2, new IvParameterSpec(getIV()));
    byte[] encrypted2 = cipher.doFinal(encrypted);

    return encrypted2;//Base64Coder.encode(encrypted2);
}

public static byte[] decrypt2(byte[] message, boolean A) throws GeneralSecurityException, IOException
{
    SecretKeySpec key1 = getSecretKeySpec(false);
    System.err.println("decrypt():\t" + key1.toString());
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    cipher.init(Cipher.DECRYPT_MODE, key1, new IvParameterSpec(getIV()));
    byte[] decrypted = cipher.doFinal(message);

    SecretKeySpec key2 = getSecretKeySpec(true);
    System.err.println("decrypt():\t" + key2.toString());
    cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, key2);
    byte[] decrypted2 = cipher.doFinal(decrypted);

    return decrypted2;
}

Answer 3

Any reason why you dont use the Appache Commons for this?

http://commons.apache.org/codec/apidocs/org/apache/commons/codec/binary/Base64.html