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POAES 128bit encryption. Inconsistent byte reads from stored SecretKey
 

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  1. POAES 128bit encryption. Inconsistent byte reads from stored SecretKey
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    <p>I'm trying to set up the following. I have a password to encrypt, I generate a key and store the key to file, I use this stored key to encrypt a string 'password' and it returns 'OePTgm4jy8vbOO8Kf+XTaA==' for example, I later pass this string into a decrypter which loads the stored key from file and converts it back to password in a java class file.</p> <p>I have this working, but only some of the time. The problem appears to be when I read the key file. When I write the key using:</p> <pre><code>System.out.println("write:" + key.getEncoded().length); </code></pre> <p>I get "write:16"</p> <p>when I read this again I get either read:16 or read:17 (most usually read:17).</p> <p>The code I'm using to write the SecretKey is:</p> <pre><code> KeyGenerator keyGenerator = KeyGenerator.getInstance("AES"); keyGenerator.init(128); // 128 default; 192 and 256 also possible SecretKey key = keyGenerator.generateKey(); return key; </code></pre> <p>the to read it:</p> <pre><code> String hex = new String(readFileToByteArray(file)); byte[] encoded = new BigInteger(hex, 16).toByteArray(); SecretKey key = new SecretKeySpec(encoded, "AES"); System.out.println("read:" + key.getEncoded().length); return key; </code></pre> <p>When it fails the error is caught here:</p> <pre><code> byte[] raw = key.getEncoded(); System.out.println(key.getEncoded().length); SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); try { ecipher = Cipher.getInstance("AES"); dcipher = Cipher.getInstance("AES"); ecipher.init(Cipher.ENCRYPT_MODE, skeySpec); dcipher.init(Cipher.DECRYPT_MODE, skeySpec); } catch (javax.crypto.NoSuchPaddingException e) { e.printStackTrace(); } catch (java.security.NoSuchAlgorithmException e) { e.printStackTrace(); **} catch (java.security.InvalidKeyException e) { e.printStackTrace();** } read:17 17 java.security.InvalidKeyException: Invalid AES key length: 17 bytes at com.ibm.crypto.provider.AESCipher.engineGetKeySize(Unknown Source) at javax.crypto.Cipher.b(Unknown Source) at javax.crypto.Cipher.a(Unknown Source) at javax.crypto.Cipher.a(Unknown Source) at javax.crypto.Cipher.a(Unknown Source) at javax.crypto.Cipher.init(Unknown Source) at javax.crypto.Cipher.init(Unknown Source) at au.edu.uts.itd.encryption.manager.AESEncrypter.&lt;init&gt;(AESEncrypter.java:21) at au.edu.uts.itd.encryption.util.Encrypt.main(Encrypt.java:26) Exception in thread "main" java.lang.IllegalStateException: Cipher not initialized at javax.crypto.Cipher.c(Unknown Source) at javax.crypto.Cipher.doFinal(Unknown Source) at au.edu.uts.itd.encryption.manager.AESEncrypter.encrypt(AESEncrypter.java:39) at au.edu.uts.itd.encryption.util.Encrypt.main(Encrypt.java:27) </code></pre> <p>So the fact I writing 16 and retrieving 17 bytes is the problem I believe.</p> <p>Can someone advise on how to ensure the read is 16 bytes as it was written?</p>
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    1. COI don't see any code that writes to a file.
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    2. COwhat does readFileToByteArray() do. You should set the encoding for all String actions? Why are you use the BigInteger class....you can just say: yourString.getBytes() or something like that.
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      1. USHectorLector
 

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