List of usage examples for javax.crypto CipherInputStream read
public int read(byte b[]) throws IOException
b.length bytes of data from this input stream into an array of bytes. From source file:com.filelocker.encryption.AES_Encryption.java
/** * Read from the encrypted file (input) and turn the cipher back into cleartext. Write the cleartext buffer back out * to disk as (output) File./*ww w . j a va2 s .c om*/ * * I left CipherInputStream in here as a test to see if I could mix it with the update() and final() methods of encrypting * and still have a correctly decrypted file in the end. Seems to work so left it in. * * @param input - File object representing encrypted data on disk * @param output - File object of cleartext data to write out after decrypting * @throws IllegalBlockSizeException * @throws BadPaddingException * @throws IOException */ public void ReadEncryptedFile(File input, File output) throws IllegalBlockSizeException, BadPaddingException, IOException { FileInputStream fin; FileOutputStream fout; CipherInputStream cin; long totalread = 0; int nread = 0; byte[] inbuf = new byte[MAX_FILE_BUF]; fout = new FileOutputStream(output); fin = new FileInputStream(input); // creating a decoding stream from the FileInputStream above using the cipher created from setupDecrypt() cin = new CipherInputStream(fin, vDecipher); while ((nread = cin.read(inbuf)) > 0) { Db("read " + nread + " bytes"); totalread += nread; // create a buffer to write with the exact number of bytes read. Otherwise a short read fills inbuf with 0x0 byte[] trimbuf = new byte[nread]; for (int i = 0; i < nread; i++) trimbuf[i] = inbuf[i]; // write out the size-adjusted buffer fout.write(trimbuf); } fout.flush(); cin.close(); fin.close(); fout.close(); Db("wrote " + totalread + " dencrypted bytes"); Db("Decryption Complete File Unlocked"); }
From source file:org.apache.camel.converter.crypto.CryptoDataFormat.java
public Object unmarshal(Exchange exchange, InputStream encryptedStream) throws Exception { Object unmarshalled = null;//from www .ja va 2 s . c o m if (encryptedStream != null) { byte[] iv = getInlinedInitializationVector(exchange, encryptedStream); Key key = getKey(exchange); CipherInputStream cipherStream = new CipherInputStream(encryptedStream, initializeCipher(DECRYPT_MODE, key, iv)); ByteArrayOutputStream plaintextStream = new ByteArrayOutputStream(bufferSize); HMACAccumulator hmac = getMessageAuthenticationCode(key); byte[] buffer = new byte[bufferSize]; hmac.attachStream(plaintextStream); int read; while ((read = cipherStream.read(buffer)) >= 0) { hmac.decryptUpdate(buffer, read); } hmac.validate(); unmarshalled = plaintextStream.toByteArray(); } return unmarshalled; }
From source file:ropes.Crypto.java
/** * Read from the encrypted file (input) and turn the cipher back into cleartext. Write the cleartext buffer back out * to disk as (output) File.//from ww w .ja va2s . c o m * * I left CipherInputStream in here as a test to see if I could mix it with the update() and final() methods of encrypting * and still have a correctly decrypted file in the end. Seems to work so left it in. * * @param input - File object representing encrypted data on disk * @param output - File object of cleartext data to write out after decrypting * @throws IllegalBlockSizeException * @throws BadPaddingException * @throws IOException */ public void ReadEncryptedFile(File input, File output) { try { FileInputStream fin; FileOutputStream fout; CipherInputStream cin; long totalread = 0; int nread = 0; byte[] inbuf = new byte[MAX_FILE_BUF]; fout = new FileOutputStream(output); fin = new FileInputStream(input); // creating a decoding stream from the FileInputStream above using the cipher created from setupDecrypt() cin = new CipherInputStream(fin, mDecipher); while ((nread = cin.read(inbuf)) > 0) { Db("read " + nread + " bytes"); totalread += nread; // create a buffer to write with the exact number of bytes read. Otherwise a short read fills inbuf with 0x0 byte[] trimbuf = new byte[nread]; for (int i = 0; i < nread; i++) trimbuf[i] = inbuf[i]; // write out the size-adjusted buffer fout.write(trimbuf); } fout.flush(); cin.close(); fin.close(); fout.close(); Db("wrote " + totalread + " encrypted bytes"); } catch (FileNotFoundException ex) { Logger.getLogger(Crypto.class.getName()).log(Level.SEVERE, null, ex); } catch (IOException ex) { Logger.getLogger(Crypto.class.getName()).log(Level.SEVERE, null, ex); } }
From source file:uk.ac.ox.webauth.Token.java
/** * Initialise a token with a base64 encoded Webauth token. * @param tokenData The data to be decrypted. * @param sessionKey The session key to use for the AES and Hmac. * @throws GeneralSecurityException if there was a problem with the security code used. *//*from www .ja va 2 s . co m*/ public Token(byte[] tokenData, Key sessionKey) throws GeneralSecurityException { // a token is: // {key-hint}{nonce }{hmac }{token-attributes }{padding } // {4 bytes }{16 bytes}{20 bytes}{make the data into multiple of 16 bytes} // everything after the key hint is aes encrypted try { // set up some streams ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(tokenData); DataInputStream dataInputStream = new DataInputStream(byteArrayInputStream); // read the key hint int keyHint = dataInputStream.readInt(); // prepare to AES decrypt the rest Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding"); cipher.init(DECRYPT_MODE, sessionKey, IV); CipherInputStream decrypt = new CipherInputStream(byteArrayInputStream, cipher); // throw away the nonce if (decrypt.read(new byte[16]) != 16) { throw new GeneralSecurityException("Failed to read nonce from token."); } // read the HMACSHA1 checksum byte[] checksum = new byte[20]; if (decrypt.read(checksum) != 20) { throw new GeneralSecurityException("Failed to read HMAC SHA1 checksum from token."); } // read in the rest of the data ByteArrayOutputStream tokenByteArrayOutputStream = new ByteArrayOutputStream(); for (int b = decrypt.read(); b != -1; b = decrypt.read()) { tokenByteArrayOutputStream.write(b); } byte[] data = tokenByteArrayOutputStream.toByteArray(); decrypt.close(); // check the hmacsha1 Mac hmacSHA1 = Mac.getInstance("HmacSHA1"); hmacSHA1.init(sessionKey); if (!Arrays.equals(checksum, hmacSHA1.doFinal(data))) { throw new GeneralSecurityException("Invalid token, checksum mismatch."); } // create all the key-value pairs for (int i = 0, start = 0; (i = indexOf(SEMI_COLON, data, i)) != -1;) { i++; if (i < data.length && data[i] == SEMI_COLON) { i++; continue; } byte[] keyValuePairArray = new byte[i - start]; System.arraycopy(data, start, keyValuePairArray, 0, keyValuePairArray.length); KeyValuePair kvp = new KeyValuePair(keyValuePairArray); kv.put(new String(kvp.key(), "US-ASCII"), kvp); start = i; } } catch (IOException ioe) { /* should never happen as it's a ByteArrayInputStream */ ioe.printStackTrace(); } valid = true; // create the Stringifier to use stringifier = new WebauthTokenStringifier(); }
From source file:com.pari.nm.utils.backup.BackupRestore.java
public boolean decrypt(File backupZipFile, File encrZipFile) throws Exception { try {/*from w w w. ja v a2 s . c om*/ FileOutputStream fout = new FileOutputStream(backupZipFile); FileInputStream fin = new FileInputStream(encrZipFile); Cipher cipher = Cipher.getInstance("DESEDE"); cipher.init(Cipher.DECRYPT_MODE, getDefaultKey()); CipherInputStream cin = new CipherInputStream(fin, cipher); byte[] buffer = new byte[8192]; try { int read = cin.read(buffer); while (read != -1) { fout.write(buffer, 0, read); read = cin.read(buffer); } } finally { try { fout.close(); } catch (Exception ignore) { } try { cin.close(); } catch (Exception ignore) { } try { fin.close(); } catch (Exception ignore) { } } return true; } catch (Exception ex) { ex.printStackTrace(); } return false; }