【Android】【加密】Android AES 文件加密

此4种文件加密方式，均验证（7501）

代码一

public boolean AESCipher(int cipherMode, String sourceFilePath, String targetFilePath, String seed) {if (cipherMode != Cipher.ENCRYPT_MODE  && cipherMode != Cipher.DECRYPT_MODE) {  return false;  }boolean result = false;  FileChannel sourceFC = null;  FileChannel targetFC = null;try{File sourceFile = new File(sourceFilePath);  File targetFile = new File(targetFilePath); sourceFC = new RandomAccessFile(sourceFile, "r").getChannel();  targetFC = new RandomAccessFile(targetFile, "rw").getChannel(); byte[] rawkey = getRawKey(seed.getBytes());  SecretKeySpec secretKey = new SecretKeySpec(rawkey, "AES");  Cipher mCipher = Cipher.getInstance("AES/CFB/NoPadding");mCipher.init(cipherMode, secretKey, new IvParameterSpec(new byte[mCipher.getBlockSize()]));  ByteBuffer byteData = ByteBuffer.allocate(1024); while (sourceFC.read(byteData) != -1) {  // 通过通道读写交叉进行。  // 将缓冲区准备为数据传出状态  byteData.flip();  byte[] byteList = new byte[byteData.remaining()];  byteData.get(byteList, 0, byteList.length);  //此处，若不使用数组加密解密会失败，因为当byteData达不到1024个时，加密方式不同对空白字节的处理也不相同，从而导致成功与失败。   byte[] bytes = mCipher.doFinal(byteList);  targetFC.write(ByteBuffer.wrap(bytes));  byteData.clear();  }  result = true;  }catch(Exception e){Log.e(TAG, e.getMessage(), e);}finally{try {                  if (sourceFC != null) {                      sourceFC.close();                  }                  if (targetFC != null) {                      targetFC.close();                  }              } catch (Exception e) {                  Log.e(TAG, e.getMessage(), e);              }  }return result;}/**  * 使用一个安全的随机数来产生一个密匙,密匙加密使用的  *   * @param seed  * @return  * @throws NoSuchAlgorithmException  */  private byte[] getRawKey(byte[] seed) throws Exception {  // 获得一个随机数，传入的参数为默认方式。  SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");// 设置一个种子,一般是用户设定的密码  sr.setSeed(seed);  // 获得一个key生成器（AES加密模式）  KeyGenerator keyGen = KeyGenerator.getInstance("AES");  // 设置密匙长度128位  keyGen.init(128, sr);  // 获得密匙  SecretKey key = keyGen.generateKey();  // 返回密匙的byte数组供加解密使用  byte[] raw = key.getEncoded();  return raw;  }  

方式二

// AES/CBC/NoPaddingno// AES/CBC/PKCS5Paddingno// AES/CBC/ISO10126Paddingno// AES/CFB/NoPadding               无异常，但解密后的图片，打开后无内容// AES/CFB/PKCS5Padding         no// AES/CFB/ISO10126Padding no// AES/ECB/NoPadding               no// AES/ECB/PKCS5Padding         no// AES/ECB/ISO10126Padding    no, pad block corrupted when decrypt// AES/OFB/NoPadding               无异常，但解密后的图片，打开后无内容// AES/OFB/PKCS5Padding          no  // AES/OFB/ISO10126Padding     no// AES/PCBC/NoPadding              no// AES/PCBC/PKCS5Padding         no// AES/PCBC/ISO10126Padding    no private static final String TRANSFORMATION = "AES";private static final String ALGORITHM = "AES";private static final int KEY_SIZE = 128;private static final int CACHE_SIZE = 1024;public static void encryptFile(String sourceFilePath, String destFilePath)  throws Exception{File sourceFile = new File(sourceFilePath);File destFile = new File(destFilePath);destFile.createNewFile();InputStream is = null; OutputStream os = null;CipherInputStream cis = null;is = new FileInputStream(sourceFile);os = new FileOutputStream(destFile);// keyString seed = "abc";SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");sr.setSeed(seed.getBytes());KeyGenerator kgen = KeyGenerator.getInstance(ALGORITHM);  //kgen.init(KEY_SIZE);kgen.init(KEY_SIZE, sr);SecretKey secretKey = kgen.generateKey();byte[] enCodeFormat = secretKey.getEncoded();  SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, ALGORITHM);  //  CipherCipher cipher = Cipher.getInstance(TRANSFORMATION); cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);cis = new CipherInputStream(is, cipher);byte[] cache = new byte[CACHE_SIZE];int nRead = 0;while ((nRead = cis.read(cache)) != -1) {os.write(cache, 0, nRead);os.flush();}os.close();cis.close();is.close();}public static void decryptFile(String sourceFilePath, String destFilePath)  throws Exception{File sourceFile = new File(sourceFilePath);File destFile = new File(destFilePath);destFile.createNewFile();InputStream is = null; OutputStream os = null;CipherOutputStream cos = null;is = new FileInputStream(sourceFile);os = new FileOutputStream(destFile);// keyString seed = "abc";SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");sr.setSeed(seed.getBytes());KeyGenerator kgen = KeyGenerator.getInstance(ALGORITHM);  //kgen.init(KEY_SIZE);kgen.init(KEY_SIZE, sr);SecretKey secretKey = kgen.generateKey();byte[] enCodeFormat = secretKey.getEncoded();  SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, ALGORITHM);  Cipher cipher = Cipher.getInstance(TRANSFORMATION); cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);cos = new CipherOutputStream(os, cipher);byte[] cache = new byte[CACHE_SIZE];int nRead = 0;while ((nRead = is.read(cache)) != -1) {cos.write(cache, 0, nRead);cos.flush();}cos.close();os.close();is.close();}

方式三

private static final int CACHE_SIZE = 1024;public static void encryptFile(String sourceFilePath, String destFilePath)  throws Exception{File sourceFile = new File(sourceFilePath);File destFile = new File(destFilePath);destFile.createNewFile();InputStream is = new FileInputStream(sourceFile); OutputStream os = new FileOutputStream(destFile);int seed = 1;os.write(seed);byte[] cache = new byte[CACHE_SIZE];int nRead = 0;while ((nRead = is.read(cache)) != -1) {os.write(cache, 0, nRead);os.flush();}os.close();is.close();}public static void decryptFile(String sourceFilePath, String destFilePath)  throws Exception{File sourceFile = new File(sourceFilePath);File destFile = new File(destFilePath);destFile.createNewFile();InputStream is = new FileInputStream(sourceFile); OutputStream os = new FileOutputStream(destFile);int seed = is.read();Log.d(TAG, "seed: " + seed);byte[] cache = new byte[CACHE_SIZE];int nRead = 0;while ((nRead = is.read(cache)) != -1) {os.write(cache, 0, nRead);os.flush();}os.close();is.close();}

方式四

public static void encryptFile(String sourceFilePath)  throws Exception{RandomAccessFile file = new RandomAccessFile(sourceFilePath, "rw");file.seek(0);byte first = file.readByte();byte second = file.readByte();file.seek(0);file.writeByte(second);file.writeByte(first);file.close();}

注：部分代码源于网络，但已记不清源自哪里。