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POjavax.crypto.BadPaddingException: Data must start with zero
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  1. POjavax.crypto.BadPaddingException: Data must start with zero
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    copied!<p>First of all, this is not a duplicate question. I am facing a very strange issue.</p> <p>Following is what I do.</p> <p><strong>Case 1:</strong></p> <ol> <li>Generate Key Pair</li> <li>Encrypt Using Private Key</li> <li>Decrypt Using Public Key</li> </ol> <p>Everything works fine.</p> <p><strong>Case 2:</strong></p> <ol> <li>Load Certificate from Mozila Firefox Key Store</li> <li>Use Certificate A</li> <li>Encrypt Using Private Key of Certificate A</li> <li>Decrypt Using Public Keu of Certificate A</li> </ol> <p>Everything works fine.</p> <p><strong>Case 3:</strong></p> <ol> <li>Load Certificate from Internet Explorer Key Store</li> <li>Use Certificate A</li> <li>Encrypt Using Private Key of Certificate A</li> <li>Decrypt Using Public Keu of Certificate A</li> </ol> <p>At Decrypt time, I get error of BadPadding exception</p> <p>Following is snippet of each of my codes.</p> <p><strong>Generating Key Pair</strong></p> <pre><code> KeyPair keyPair = KeyPairGenerator.getInstance("RSA").generateKeyPair(); PublicKey publicKey = keyPair.getPublic(); PrivateKey privateKey = keyPair.getPrivate(); </code></pre> <p><strong>Load Mozilla KeyStore</strong></p> <pre><code> String strCfg = System.getProperty("user.home")+ File.separator + "jdk6-nss-mozilla.cfg"; Provider p1 = new sun.security.pkcs11.SunPKCS11(strCfg); Security.addProvider(p1); keyStore = KeyStore.getInstance("PKCS11"); keyStore.load(null, "password".toCharArray()); </code></pre> <p><strong>Content of Config file</strong></p> <pre><code>name=NSS slot=2 library=C:/Program Files/Mozilla Firefox/softokn3.dll nssArgs="configDir='C:/Documents and Settings/pratik.vohera.DIGI-CORP/Application Data/Mozilla/Firefox/Profiles/t48xsipj.default' certPrefix='' keyPrefix='' secmod='secmod.db' flags=readOnly" </code></pre> <p><strong>Load IE KeyStore</strong></p> <pre><code> keyStore = KeyStore.getInstance("Windows-MY"); keyStore.load(null, null); </code></pre> <p><strong>Get Public and Private key from KeyStore</strong></p> <pre><code> if (keyStore != null) { Enumeration&lt;String&gt; enumaration = null; try { enumaration = keyStore.aliases(); } catch (KeyStoreException e1) { e1.printStackTrace(); } ArrayList&lt;String&gt; certiList; while (enumaration.hasMoreElements()) { String aliases = enumaration.nextElement(); certiList = new ArrayList&lt;String&gt;(); certiList.add(aliases); try { selectedCert = keyStore.getCertificate(aliases); selectedpublickey = (RSAPublicKey) selectedCert.getPublicKey(); selectedAlias = aliases; selectedprivateKey = (PrivateKey) keyStore.getKey(selectedAlias, null);} } catch (KeyStoreException e) { e.printStackTrace(); } } </code></pre> <p><strong>Encryption</strong></p> <pre><code>private static String publicEncrypt(String text, Key pubKey) throws Exception { BASE64Encoder bASE64Encoder = new BASE64Encoder(); byte[] plainText = text.getBytes(); Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding"); cipher.init(Cipher.ENCRYPT_MODE, pubKey); String encryptedText = bASE64Encoder.encode(cipher.doFinal(plainText)); return encryptedText; } </code></pre> <p><strong>Decryption</strong></p> <pre><code>private static String privateDecrypt(String text, Key priKey)throws Exception { BASE64Decoder base64Decoder = new BASE64Decoder(); byte[] encryptText = base64Decoder.decodeBuffer(text); Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding"); cipher.init(Cipher.DECRYPT_MODE, priKey); String decryptedString = new String(cipher.doFinal(encryptText)); return decryptedString; } </code></pre> <p><strong>Exception Stacktrace</strong></p> <pre><code>javax.crypto.BadPaddingException: Data must start with zero at sun.security.rsa.RSAPadding.unpadV15(Unknown Source) at sun.security.rsa.RSAPadding.unpad(Unknown Source) at com.sun.crypto.provider.RSACipher.a(DashoA13*..) at com.sun.crypto.provider.RSACipher.engineDoFinal(DashoA13*..) at javax.crypto.Cipher.doFinal(DashoA13*..) at test.testclass.privateDecrypt(testclass.java:198) at test.testclass.test(testclass.java:137) at test.testclass.main(testclass.java:120) </code></pre> <p>I have been working on this for a long time. This is very important. Do let me know if any further information is required.</p>
 

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