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POJava: fileoutputstream (access denied )
 

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  1. POJava: fileoutputstream (access denied )
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    <p>I am using AESCrypt open source library to encrypt file. This is my code</p> <pre><code>String password="asdfgh"; String frompath=new String("C:/Users/sabertooth/Desktop/error/pnberror.png"); String topath=new String("C:/Users/sabertooth/desktop/error/"); AESCrypt aes=new AESCrypt(false,password); aes.encrypt(2, frompath, topath); </code></pre> <p>I am geeting access denied exception. Here is the stacktrace</p> <pre><code>Exception in thread "main" java.io.FileNotFoundException: C:\Users\sabertooth\desktop\error (Access is denied) at java.io.FileOutputStream.open(Native Method) at java.io.FileOutputStream.&lt;init&gt;(FileOutputStream.java:212) at java.io.FileOutputStream.&lt;init&gt;(FileOutputStream.java:104) at AESCrypt.encrypt(AESCrypt.java:284) at NewClass.main(NewClass.java:28) Java Result: 1 BUILD SUCCESSFUL (total time: 0 seconds) </code></pre> <p>Posting the code for aescrypt.java</p> <pre><code>/* * Copyright 2008 Vócali Sistemas Inteligentes * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import java.net.NetworkInterface; import java.security.GeneralSecurityException; import java.security.InvalidKeyException; import java.security.MessageDigest; import java.security.SecureRandom; import java.util.Arrays; import java.util.Enumeration; import javax.crypto.Cipher; import javax.crypto.Mac; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; /** * This class provides methods to encrypt and decrypt files using * &lt;a href="http://www.aescrypt.com/aes_file_format.html"&gt;aescrypt file format&lt;/a&gt;, * version 1 or 2. * &lt;p&gt; * Requires Java 6 and &lt;a href="http://java.sun.com/javase/downloads/index.jsp"&gt;Java * Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files&lt;/a&gt;. * &lt;p&gt; * Thread-safety and sharing: this class is not thread-safe.&lt;br&gt; * &lt;tt&gt;AESCrypt&lt;/tt&gt; objects can be used as Commands (create, use once and dispose), * or reused to perform multiple operations (not concurrently though). * * @author Vócali Sistemas Inteligentes */ public class AESCrypt { private static final String JCE_EXCEPTION_MESSAGE = "Please make sure " + "\"Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files\" " + "(http://java.sun.com/javase/downloads/index.jsp) is installed on your JRE."; private static final String RANDOM_ALG = "SHA1PRNG"; private static final String DIGEST_ALG = "SHA-256"; private static final String HMAC_ALG = "HmacSHA256"; private static final String CRYPT_ALG = "AES"; private static final String CRYPT_TRANS = "AES/CBC/NoPadding"; private static final byte[] DEFAULT_MAC = {0x01, 0x23, 0x45, 0x67, (byte) 0x89, (byte) 0xab, (byte) 0xcd, (byte) 0xef}; private static final int KEY_SIZE = 32; private static final int BLOCK_SIZE = 16; private static final int SHA_SIZE = 32; private final boolean DEBUG; private byte[] password; private Cipher cipher; private Mac hmac; private SecureRandom random; private MessageDigest digest; private IvParameterSpec ivSpec1; private SecretKeySpec aesKey1; private IvParameterSpec ivSpec2; private SecretKeySpec aesKey2; /******************* * PRIVATE METHODS * *******************/ /** * Prints a debug message on standard output if DEBUG mode is turned on. */ protected void debug(String message) { if (DEBUG) { System.out.println("[DEBUG] " + message); } } /** * Prints a debug message on standard output if DEBUG mode is turned on. */ protected void debug(String message, byte[] bytes) { if (DEBUG) { StringBuilder buffer = new StringBuilder("[DEBUG] "); buffer.append(message); buffer.append("["); for (int i = 0; i &lt; bytes.length; i++) { buffer.append(bytes[i]); buffer.append(i &lt; bytes.length - 1 ? ", " : "]"); } System.out.println(buffer.toString()); } } /** * Generates a pseudo-random byte array. * @return pseudo-random byte array of &lt;tt&gt;len&lt;/tt&gt; bytes. */ protected byte[] generateRandomBytes(int len) { byte[] bytes = new byte[len]; random.nextBytes(bytes); return bytes; } /** * SHA256 digest over given byte array and random bytes.&lt;br&gt; * &lt;tt&gt;bytes.length&lt;/tt&gt; * &lt;tt&gt;num&lt;/tt&gt; random bytes are added to the digest. * &lt;p&gt; * The generated hash is saved back to the original byte array.&lt;br&gt; * Maximum array size is {@link #SHA_SIZE} bytes. */ protected void digestRandomBytes(byte[] bytes, int num) { assert bytes.length &lt;= SHA_SIZE; digest.reset(); digest.update(bytes); for (int i = 0; i &lt; num; i++) { random.nextBytes(bytes); digest.update(bytes); } System.arraycopy(digest.digest(), 0, bytes, 0, bytes.length); } /** * Generates a pseudo-random IV based on time and this computer's MAC. * &lt;p&gt; * This IV is used to crypt IV 2 and AES key 2 in the file. * @return IV. */ protected byte[] generateIv1() { byte[] iv = new byte[BLOCK_SIZE]; long time = System.currentTimeMillis(); byte[] mac = null; try { Enumeration&lt;NetworkInterface&gt; ifaces = NetworkInterface.getNetworkInterfaces(); while (mac == null &amp;&amp; ifaces.hasMoreElements()) { mac = ifaces.nextElement().getHardwareAddress(); } } catch (Exception e) { // Ignore. } if (mac == null) { mac = DEFAULT_MAC; } for (int i = 0; i &lt; 8; i++) { iv[i] = (byte) (time &gt;&gt; (i * 8)); } System.arraycopy(mac, 0, iv, 8, mac.length); digestRandomBytes(iv, 256); return iv; } /** * Generates an AES key starting with an IV and applying the supplied user password. * &lt;p&gt; * This AES key is used to crypt IV 2 and AES key 2. * @return AES key of {@link #KEY_SIZE} bytes. */ protected byte[] generateAESKey1(byte[] iv, byte[] password) { byte[] aesKey = new byte[KEY_SIZE]; System.arraycopy(iv, 0, aesKey, 0, iv.length); for (int i = 0; i &lt; 8192; i++) { digest.reset(); digest.update(aesKey); digest.update(password); aesKey = digest.digest(); } return aesKey; } /** * Generates the random IV used to crypt file contents. * @return IV 2. */ protected byte[] generateIV2() { byte[] iv = generateRandomBytes(BLOCK_SIZE); digestRandomBytes(iv, 256); return iv; } /** * Generates the random AES key used to crypt file contents. * @return AES key of {@link #KEY_SIZE} bytes. */ protected byte[] generateAESKey2() { byte[] aesKey = generateRandomBytes(KEY_SIZE); digestRandomBytes(aesKey, 32); return aesKey; } /** * Utility method to read bytes from a stream until the given array is fully filled. * @throws IOException if the array can't be filled. */ protected void readBytes(InputStream in, byte[] bytes) throws IOException { if (in.read(bytes) != bytes.length) { throw new IOException("Unexpected end of file"); } } /************** * PUBLIC API * **************/ /** * Builds an object to encrypt or decrypt files with the given password. * @throws GeneralSecurityException if the platform does not support the required cryptographic methods. * @throws UnsupportedEncodingException if UTF-16 encoding is not supported. */ public AESCrypt(String password) throws GeneralSecurityException, UnsupportedEncodingException { this(false, password); } /** * Builds an object to encrypt or decrypt files with the given password. * @throws GeneralSecurityException if the platform does not support the required cryptographic methods. * @throws UnsupportedEncodingException if UTF-16 encoding is not supported. */ public AESCrypt(boolean debug, String password) throws GeneralSecurityException, UnsupportedEncodingException { try { DEBUG = debug; setPassword(password); random = SecureRandom.getInstance(RANDOM_ALG); digest = MessageDigest.getInstance(DIGEST_ALG); cipher = Cipher.getInstance(CRYPT_TRANS); hmac = Mac.getInstance(HMAC_ALG); } catch (GeneralSecurityException e) { throw new GeneralSecurityException(JCE_EXCEPTION_MESSAGE, e); } } /** * Changes the password this object uses to encrypt and decrypt. * @throws UnsupportedEncodingException if UTF-16 encoding is not supported. */ public void setPassword(String password) throws UnsupportedEncodingException { this.password = password.getBytes("UTF-16LE"); debug("Using password: ", this.password); } /** * The file at &lt;tt&gt;fromPath&lt;/tt&gt; is encrypted and saved at &lt;tt&gt;toPath&lt;/tt&gt; location. * &lt;p&gt; * &lt;tt&gt;version&lt;/tt&gt; can be either 1 or 2. * @throws IOException when there are I/O errors. * @throws GeneralSecurityException if the platform does not support the required cryptographic methods. */ public void encrypt(int version, String fromPath, String toPath) throws IOException, GeneralSecurityException { InputStream in = null; OutputStream out = null; try { in = new BufferedInputStream(new FileInputStream(fromPath)); debug("Opened for reading: " + fromPath); out = new BufferedOutputStream(new FileOutputStream(toPath)); debug("Opened for writing: " + toPath); encrypt(version, in, out); } finally { if (in != null) { in.close(); } if (out != null) { out.close(); } } } /** * The input stream is encrypted and saved to the output stream. * &lt;p&gt; * &lt;tt&gt;version&lt;/tt&gt; can be either 1 or 2.&lt;br&gt; * None of the streams are closed. * @throws IOException when there are I/O errors. * @throws GeneralSecurityException if the platform does not support the required cryptographic methods. */ public void encrypt(int version, InputStream in, OutputStream out) throws IOException, GeneralSecurityException { try { byte[] text = null; ivSpec1 = new IvParameterSpec(generateIv1()); aesKey1 = new SecretKeySpec(generateAESKey1(ivSpec1.getIV(), password), CRYPT_ALG); ivSpec2 = new IvParameterSpec(generateIV2()); aesKey2 = new SecretKeySpec(generateAESKey2(), CRYPT_ALG); debug("IV1: ", ivSpec1.getIV()); debug("AES1: ", aesKey1.getEncoded()); debug("IV2: ", ivSpec2.getIV()); debug("AES2: ", aesKey2.getEncoded()); out.write("AES".getBytes("UTF-8")); // Heading. out.write(version); // Version. out.write(0); // Reserved. if (version == 2) { // No extensions. out.write(0); out.write(0); } out.write(ivSpec1.getIV()); // Initialization Vector. text = new byte[BLOCK_SIZE + KEY_SIZE]; cipher.init(Cipher.ENCRYPT_MODE, aesKey1, ivSpec1); cipher.update(ivSpec2.getIV(), 0, BLOCK_SIZE, text); cipher.doFinal(aesKey2.getEncoded(), 0, KEY_SIZE, text, BLOCK_SIZE); out.write(text); // Crypted IV and key. debug("IV2 + AES2 ciphertext: ", text); hmac.init(new SecretKeySpec(aesKey1.getEncoded(), HMAC_ALG)); text = hmac.doFinal(text); out.write(text); // HMAC from previous cyphertext. debug("HMAC1: ", text); cipher.init(Cipher.ENCRYPT_MODE, aesKey2, ivSpec2); hmac.init(new SecretKeySpec(aesKey2.getEncoded(), HMAC_ALG)); text = new byte[BLOCK_SIZE]; int len, last = 0; while ((len = in.read(text)) &gt; 0) { cipher.update(text, 0, BLOCK_SIZE, text); hmac.update(text); out.write(text); // Crypted file data block. last = len; } last &amp;= 0x0f; out.write(last); // Last block size mod 16. debug("Last block size mod 16: " + last); text = hmac.doFinal(); out.write(text); // HMAC from previous cyphertext. debug("HMAC2: ", text); } catch (InvalidKeyException e) { throw new GeneralSecurityException(JCE_EXCEPTION_MESSAGE, e); } } /** * The file at &lt;tt&gt;fromPath&lt;/tt&gt; is decrypted and saved at &lt;tt&gt;toPath&lt;/tt&gt; location. * &lt;p&gt; * The input file can be encrypted using version 1 or 2 of aescrypt.&lt;br&gt; * @throws IOException when there are I/O errors. * @throws GeneralSecurityException if the platform does not support the required cryptographic methods. */ public void decrypt(String fromPath, String toPath) throws IOException, GeneralSecurityException { InputStream in = null; OutputStream out = null; try { in = new BufferedInputStream(new FileInputStream(fromPath)); debug("Opened for reading: " + fromPath); out = new BufferedOutputStream(new FileOutputStream(toPath)); debug("Opened for writing: " + toPath); decrypt(new File(fromPath).length(), in, out); } finally { if (in != null) { in.close(); } if (out != null) { out.close(); } } } /** * The input stream is decrypted and saved to the output stream. * &lt;p&gt; * The input file size is needed in advance.&lt;br&gt; * The input stream can be encrypted using version 1 or 2 of aescrypt.&lt;br&gt; * None of the streams are closed. * @throws IOException when there are I/O errors. * @throws GeneralSecurityException if the platform does not support the required cryptographic methods. */ public void decrypt(long inSize, InputStream in, OutputStream out) throws IOException, GeneralSecurityException { try { byte[] text = null, backup = null; long total = 3 + 1 + 1 + BLOCK_SIZE + BLOCK_SIZE + KEY_SIZE + SHA_SIZE + 1 + SHA_SIZE; int version; text = new byte[3]; readBytes(in, text); // Heading. if (!new String(text, "UTF-8").equals("AES")) { throw new IOException("Invalid file header"); } version = in.read(); // Version. if (version &lt; 1 || version &gt; 2) { throw new IOException("Unsupported version number: " + version); } debug("Version: " + version); in.read(); // Reserved. if (version == 2) { // Extensions. text = new byte[2]; int len; do { readBytes(in, text); len = ((0xff &amp; (int) text[0]) &lt;&lt; 8) | (0xff &amp; (int) text[1]); if (in.skip(len) != len) { throw new IOException("Unexpected end of extension"); } total += 2 + len; debug("Skipped extension sized: " + len); } while (len != 0); } text = new byte[BLOCK_SIZE]; readBytes(in, text); // Initialization Vector. ivSpec1 = new IvParameterSpec(text); aesKey1 = new SecretKeySpec(generateAESKey1(ivSpec1.getIV(), password), CRYPT_ALG); debug("IV1: ", ivSpec1.getIV()); debug("AES1: ", aesKey1.getEncoded()); cipher.init(Cipher.DECRYPT_MODE, aesKey1, ivSpec1); backup = new byte[BLOCK_SIZE + KEY_SIZE]; readBytes(in, backup); // IV and key to decrypt file contents. debug("IV2 + AES2 ciphertext: ", backup); text = cipher.doFinal(backup); ivSpec2 = new IvParameterSpec(text, 0, BLOCK_SIZE); aesKey2 = new SecretKeySpec(text, BLOCK_SIZE, KEY_SIZE, CRYPT_ALG); debug("IV2: ", ivSpec2.getIV()); debug("AES2: ", aesKey2.getEncoded()); hmac.init(new SecretKeySpec(aesKey1.getEncoded(), HMAC_ALG)); backup = hmac.doFinal(backup); text = new byte[SHA_SIZE]; readBytes(in, text); // HMAC and authenticity test. if (!Arrays.equals(backup, text)) { throw new IOException("Message has been altered or password incorrect"); } debug("HMAC1: ", text); total = inSize - total; // Payload size. if (total % BLOCK_SIZE != 0) { throw new IOException("Input file is corrupt"); } if (total == 0) { // Hack: empty files won't enter block-processing for-loop below. in.read(); // Skip last block size mod 16. } debug("Payload size: " + total); cipher.init(Cipher.DECRYPT_MODE, aesKey2, ivSpec2); hmac.init(new SecretKeySpec(aesKey2.getEncoded(), HMAC_ALG)); backup = new byte[BLOCK_SIZE]; text = new byte[BLOCK_SIZE]; for (int block = (int) (total / BLOCK_SIZE); block &gt; 0; block--) { int len = BLOCK_SIZE; if (in.read(backup, 0, len) != len) { // Cyphertext block. throw new IOException("Unexpected end of file contents"); } cipher.update(backup, 0, len, text); hmac.update(backup, 0, len); if (block == 1) { int last = in.read(); // Last block size mod 16. debug("Last block size mod 16: " + last); len = (last &gt; 0 ? last : BLOCK_SIZE); } out.write(text, 0, len); } out.write(cipher.doFinal()); backup = hmac.doFinal(); text = new byte[SHA_SIZE]; readBytes(in, text); // HMAC and authenticity test. if (!Arrays.equals(backup, text)) { throw new IOException("Message has been altered or password incorrect"); } debug("HMAC2: ", text); } catch (InvalidKeyException e) { throw new GeneralSecurityException(JCE_EXCEPTION_MESSAGE, e); } } /* public static void main(String[] args) { try { if (args.length &lt; 4) { System.out.println("AESCrypt e|d password fromPath toPath"); return; } AESCrypt aes = new AESCrypt(true, args[1]); switch (args[0].charAt(0)) { case 'e': aes.encrypt(2, args[2], args[3]); break; case 'd': aes.decrypt(args[2], args[3]); break; default: System.out.println("Invalid operation: must be (e)ncrypt or (d)ecrypt."); return; } } catch (Exception e) { e.printStackTrace(); } } */ } </code></pre> <p>There is a method encrypt which takes 3 arguments version frompath topath</p>
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    1. USRitesh Sangwan
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      1. POJava: fileoutputstream (access denied )
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    1. COdon't know this lib but i would suspect it trying to write to a directory and therefor the error, try `String topath=new String("C:/Users/sabertooth/desktop/error/pnberror_encrypted.png");`
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      1. POJava: fileoutputstream (access denied )
      1. USA4L
    2. CO[AESCrypt](http://www.docjar.com/docs/api/com/sun/crypto/provider/AESCrypt.html) doesn't have encrypt method. Is it your own AESCrypt class?
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    3. COPost the code of your AESCrypt class
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      1. USAubin
 

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