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PODecrypted string not the same as pre encrypted string
 

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  1. PODecrypted string not the same as pre encrypted string
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    <p>I have the following pieces of code:</p> <p><strong>Globals</strong></p> <pre><code>public static PublicKey pubKey; public static PrivateKey privKey; public static Cipher cip; </code></pre> <p><strong>Main</strong></p> <pre><code>public static void main(String[] args) throws Exception { //Generate the keys KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA"); kpg.initialize(1024); KeyPair kp = kpg.genKeyPair(); Key publicKey = kp.getPublic(); Key privateKey = kp.getPrivate(); KeyFactory fact = KeyFactory.getInstance("RSA"); cip = Cipher.getInstance("RSA/ECB/NoPadding"); // Store Public Key. X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec( publicKey.getEncoded()); FileOutputStream fos = new FileOutputStream("public.key"); fos.write(x509EncodedKeySpec.getEncoded()); fos.close(); // Store Private Key. PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec( privateKey.getEncoded()); fos = new FileOutputStream("private.key"); fos.write(pkcs8EncodedKeySpec.getEncoded()); fos.close(); //Get the public and private keys out of their files getPubAndPrivateKey(); //Check if the keys gotten out of the files are the same as the generated files (this returns truetrue) System.out.print(publicKey.equals(pubKey)); System.out.print(privateKey.equals(privKey)); byte[] text = "This is my super secret secret".getBytes(); encryptToFile("encrypted.txt", text ); decryptToFile("encrypted.txt", "decrypted.txt"); } </code></pre> <p><strong>Getting the keys from the files</strong></p> <pre><code>private static void getPubAndPrivateKey() throws IOException, Exception { // Read Public Key. File filePublicKey = new File("public.key"); FileInputStream fis = new FileInputStream("public.key"); byte[] encodedPublicKey = new byte[(int) filePublicKey.length()]; fis.read(encodedPublicKey); fis.close(); // Read Private Key. File filePrivateKey = new File("private.key"); fis = new FileInputStream("private.key"); byte[] encodedPrivateKey = new byte[(int) filePrivateKey.length()]; fis.read(encodedPrivateKey); fis.close(); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec( encodedPublicKey); pubKey = keyFactory.generatePublic(publicKeySpec); PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec( encodedPrivateKey); privKey = keyFactory.generatePrivate(privateKeySpec); } </code></pre> <p><strong>Encrypting</strong></p> <pre><code> public static void encryptToFile(String fileName, byte[] data) throws IOException { try { cip.init(Cipher.ENCRYPT_MODE, privKey); byte[] cipherData = cip.doFinal(data); String encryptedData = cipherData.toString(); BufferedWriter out = new BufferedWriter(new FileWriter(fileName)); out.write(encryptedData); out.close(); } catch (Exception e) { throw new RuntimeException("Spurious serialisation error", e); } } </code></pre> <p><strong>Decrypting</strong></p> <pre><code>private static void decryptToFile(String string, String string2) throws Exception { try { File encryptedFile = new File("encrypted.txt"); byte[] encrypted = getContents(encryptedFile).getBytes(); cip = Cipher.getInstance("RSA/ECB/PKCS1Padding"); cip.init(Cipher.DECRYPT_MODE, pubKey); byte[] cipherData = cip.doFinal(encrypted); String decryptedData = cipherData.toString(); BufferedWriter out = new BufferedWriter(new FileWriter( "decrypted.txt")); out.write(decryptedData); out.close(); } catch (Exception e) { throw e; } } </code></pre> <p><strong>Things I already checked</strong></p> <ul> <li>The data used in the decryption is the same as in the encrypted file</li> <li>The generated keys are the same as the ones gotten from the file</li> <li>The encryption and decryption both don't give errors</li> </ul> <p><strong>Results</strong><br> Original string:<br> My super secret secret<br> The encryption results in:<br> [B@1747b17 The decryption results in: [B@91a4fb</p>
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    1. USRick Hoving
    1. USRick Hoving
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      1. VTUpMod
    1. COTake a look at [this][1] - maybe some of the tips can help you out. [1]: http://stackoverflow.com/questions/2714327/rsa-badpaddingexception-data-must-start-with-zero
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      1. USYair Zaslavsky
    2. CO@zaske I changed it to "RSA/ECB/NoPadding" and the en/decryption work without errors. But 2 questions why does it work with "RSA/ECB/NoPadding" and not with "RSA/ECB/PKCS1Padding" (I'm padding it both the same right?) And why does the decryption not work propperly?
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      1. USRick Hoving
    3. COBeginner Java errors are present here. In particular, the `(byte []).toString()` method does not do what you think it does.
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      1. USJames K Polk
 

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