aes文件读取

android：

public class AesFileIo {     private static final String EOL = "\n";     private static final String AES_ALGORITHM = "AES/CTR/NoPadding";     private SecretKeySpec secretKeySpec;     private IvParameterSpec ivSpec;     private static final String PROVIDER = "BC";       AesFileIo(byte[] aesKey, byte[] iv) {         ivSpec = new IvParameterSpec(iv);         secretKeySpec = new SecretKeySpec(aesKey, "AES");     }      public String readFile(Context c, String fileName) {         StringBuilder stringBuilder = new StringBuilder();         try {             InputStream is = c.openFileInput(fileName);             Cipher cipher = Cipher.getInstance(AES_ALGORITHM, PROVIDER);             cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivSpec);             CipherInputStream cis = new CipherInputStream(is, cipher);             InputStreamReader isr = new InputStreamReader(cis);             BufferedReader reader = new BufferedReader(isr);             String line;             while ((line = reader.readLine()) != null) {                 stringBuilder.append(line).append(EOL);             }             is.close();         } catch (java.io.FileNotFoundException e) {             // OK, file probably not created yet             Log.i(this.getClass().toString(), e.getMessage(), e);         } catch (Exception e) {             Log.e(this.getClass().toString(), e.getMessage(), e);         }         return stringBuilder.toString();     }      public void writeFile(Context c, String fileName, String theFile) {         try {             Cipher cipher = Cipher.getInstance(AES_ALGORITHM, PROVIDER);              cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivSpec);             byte[] encrypted = cipher.doFinal(theFile.getBytes());              OutputStream os = c.openFileOutput(fileName, 0);             os.write(encrypted);             os.flush();             os.close();         } catch (Exception e) {             Log.e(this.getClass().toString(), e.getMessage(), e);         }     } }

public class AesFileIo {      private static final String EOL = "\n";     private static final String AES_ALGORITHM = "AES/CTR/NoPadding";     private SecretKeySpec secretKeySpec;     private IvParameterSpec ivSpec;      AesFileIo(byte[] aesKey, byte[] iv) {         Security.addProvider(new org.bouncycastle.jce.provider                 .BouncyCastleProvider());         ivSpec = new IvParameterSpec(iv);         secretKeySpec = new SecretKeySpec(aesKey, "AES");     }      public String readFile(String fileName) {         StringBuilder stringBuilder = new StringBuilder();         try {             FileInputStream fis = new FileInputStream(fileName);             Cipher cipher = Cipher.getInstance(AES_ALGORITHM);             cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivSpec);             CipherInputStream cis = new CipherInputStream(fis, cipher);             InputStreamReader isr = new InputStreamReader(cis);             BufferedReader reader = new BufferedReader(isr);             String line;             while ((line = reader.readLine()) != null) {                 stringBuilder.append(line).append(EOL);             }             fis.close();         } catch (java.io.FileNotFoundException e) {             System.out.println("FileNotFoundException: probably OK");         } catch (Exception e) {             e.printStackTrace();         }         return stringBuilder.toString();     }      public void writeFile(String fileName, String theFile) {         try {             Cipher cipher = Cipher.getInstance(AES_ALGORITHM);             cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivSpec);             byte[] encrypted = cipher.doFinal(theFile.getBytes());             FileOutputStream fos = new FileOutputStream(fileName);             fos.write(encrypted);             fos.flush();             fos.close();         } catch (Exception e) {             e.printStackTrace();         }     } }

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