Java AES encryption using 32 Byte key - Invalid Key Size
http://www.javamex.com/tutorials/cryptography/unrestricted_policy_files.shtml
"It turns out that the Cipher class will generally not allow encryption with a key size of more than 128 bits. The apparent reason behind this is that some countries (although increasingly fewer) have restrictions on the permitted key strength of imported encryption software, although the actual number 128 is questionable (see below). The good news is that:
You can easily remove the restriction by overriding the security policy files with others that Sun provides."
stackoverflow
Updated on June 09, 2022Comments
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stackoverflow almost 2 years
Possible Duplicate:
InvalidKeyException Illegal key sizepublic static byte[] encryptBytes(byte[] bytes, byte[] key) { Cipher cipher = null; try { cipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); SecretKeySpec secretKey = new SecretKeySpec(key, "AES"); cipher.init(Cipher.ENCRYPT_MODE, secretKey); return Base64.encodeBase64(cipher.doFinal(bytes)); } catch (Exception e) { e.printStackTrace(); } return null; } public static byte[] decrpytBytes(byte[] encryptedData, String key) { byte[] keyBytes = convertToByteArray(key); Cipher cipher = null; try { cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING"); SecretKeySpec secretKey = new SecretKeySpec(keyBytes, "AES"); cipher.init(Cipher.DECRYPT_MODE, secretKey); return cipher.doFinal(Base64.decodeBase64(encryptedData)); } catch (Exception e) { e.printStackTrace(); } return null; } //Simply takes every other two characters an terms them into a byte value //then stuffs them into a byteArray public static byte[] convertToByteArray(String key) { byte[] b = new byte[key.length()/2]; for(int i=0, bStepper=0; i<key.length()+2; i+=2) if(i !=0) b[bStepper++]=((byte) Integer.parseInt((key.charAt(i-2)+""+key.charAt(i-1)), 16)); return b; } public static void main(String[] args) throws Exception { //This string has 64 characters. When sent to convertToByteArray it returns a byte array or 32 bytes String key = "00112233445566778899AABBCCDDEEFF0123456789ABCDEF0123456789ABCDEF"; //Test it out byte f[] = {2,4,7}; byte[] encrypted = encryptBytes(f, convertToByteArray(key)); byte[] unencrypted = decrpytBytes(encrypted, key); System.out.print(unencrypted[0]); }
Error:
Illegal key size or default parameters
I dont know why I'm getting an invalid key size. It should be able to take 32 byte key with 256 encryption