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package net.sf.borg.common;import javax.crypto.Cipher;import javax.crypto.CipherOutputStream;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;import java.io.*;import java.security.Key;import java.security.KeyStore;import java.util.Base64;/** * class containing encryption and decryption methods for borg * */public class EncryptionHelper { /* the cached keystore object */ private final KeyStore keyStore; /* cached password */ private final String password; /** * create a new JCEKS Key Store * @param location - location (file) for the key store * @param password - key store password * @throws Exception */ static public void createStore(String location, String password) throws Exception { KeyStore store = KeyStore.getInstance("JCEKS"); store.load(null, password.toCharArray()); FileOutputStream fos = new FileOutputStream(location); store.store(fos, password.toCharArray()); fos.close(); } /** * generate a new encryption key in the key store. the key store password will * be used as the key password. * @param location - key store location * @param password - key store password * @param name - key alias * @throws Exception */ static public void generateKey(String location, String password, String name) throws Exception { KeyStore store = KeyStore.getInstance("JCEKS"); FileInputStream fis = new FileInputStream(location); store.load(fis, password.toCharArray()); fis.close(); KeyGenerator keyGen = KeyGenerator.getInstance("AES"); SecretKey key = keyGen.generateKey(); KeyStore.SecretKeyEntry skEntry = new KeyStore.SecretKeyEntry(key); store.setEntry(name, skEntry, new KeyStore.PasswordProtection(password.toCharArray())); FileOutputStream fos = new FileOutputStream(location); store.store(fos, password.toCharArray()); fos.close(); } /** * constructor - loads a KeyStore from a file * @param keyStoreLocation - key store location * @param keyStorePassword - key store password * @throws Exception */ public EncryptionHelper(String keyStoreLocation, String keyStorePassword) throws Exception { this.password = keyStorePassword; if( keyStoreLocation == null || keyStoreLocation.equals("")) throw new Warning(Resource.getResourceString("Key_Store_Not_Set")); File f = new File(keyStoreLocation); if( !f.canRead()) { throw new Warning(Resource.getResourceString("No_Key_Store") + keyStoreLocation); } this.keyStore = KeyStore.getInstance("JCEKS"); FileInputStream fis = new FileInputStream(keyStoreLocation); this.keyStore.load(fis, this.password .toCharArray()); fis.close(); } /** * encrypt a String using a key from the key store * @param clearText - the string to encrypt * @param keyAlias - the encryption key alias * @return the encrypted string * @throws Exception */ public String encrypt(String clearText, String keyAlias) throws Exception { /* * get the key and create the Cipher */ Key key = this.keyStore.getKey(keyAlias, this.password.toCharArray()); // BUG: CWE-327: Use of a Broken or Risky Cryptographic Algorithm// Cipher enc = Cipher.getInstance("AES");// FIXED: enc.init(Cipher.ENCRYPT_MODE, key); /* * encrypt the clear text */ ByteArrayOutputStream baos = new ByteArrayOutputStream(); OutputStream os = new CipherOutputStream(baos, enc); os.write(clearText.getBytes()); os.close(); /* * get the encrypted bytes and encode to a string */ byte[] ba = baos.toByteArray(); return new String(Base64.getEncoder().encode(ba)); } /** * decrypt a String using a key from the key store * @param cipherText - the string to decrypt * @param keyAlias - the decryption key alias * @return the encrypted string * @throws Exception */ public String decrypt(String cipherText, String keyAlias) throws Exception { /* * get the key and create the Cipher */ Key key = this.keyStore.getKey(keyAlias, this.password.toCharArray()); Cipher dec = Cipher.getInstance("AES"); dec.init(Cipher.DECRYPT_MODE, key); /* * decode the cipher text from base64 back to a byte array */ byte[] decba = Base64.getDecoder().decode(cipherText); /* * decrpyt the bytes */ ByteArrayOutputStream baos = new ByteArrayOutputStream(); OutputStream os = new CipherOutputStream(baos, dec); os.write(decba); os.close(); return baos.toString(); } /** * Export the borg key in text form * @param keyAlias the key alias * @param keyStorePassword the keystore password * @return the exproted key as a string * @throws Exception */ public String exportKey(String keyAlias, String keyStorePassword) throws Exception { Key key = this.keyStore.getKey(keyAlias, keyStorePassword.toCharArray()); return new String(Base64.getEncoder().encode(key.getEncoded())); } /** * Import a provided key into a KeyStore * @param location - the keystore location * @param encodedKey - the encoded key to import * @param keyAlias - the key alias * @param password - the key store password * @throws Exception */ static public void importKey(String location, String encodedKey, String keyAlias, String password) throws Exception { KeyStore store = KeyStore.getInstance("JCEKS"); FileInputStream fis = new FileInputStream(location); store.load(fis, password.toCharArray()); fis.close(); byte[] ba = Base64.getDecoder().decode(encodedKey); SecretKey key = new SecretKeySpec(ba,"AES"); KeyStore.SecretKeyEntry skEntry = new KeyStore.SecretKeyEntry(key); store.setEntry(keyAlias, skEntry, new KeyStore.PasswordProtection(password.toCharArray())); FileOutputStream fos = new FileOutputStream(location); store.store(fos, password.toCharArray()); fos.close(); }} |