聊聊、AES 和 DES

AES 和 DES 都是對稱加密的一種，可是 DES 的 Key 是 56 位，而 AES 的 Key 有 128,256,512 可選。 

AES 

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 加密AES 

String randomKey = "12345678";    

public static String ENAES() { try { KeyGenerator keyGene = KeyGenerator.getInstance("AES"); keyGene.init(128, new SecureRandom(randomKey.getBytes())); SecretKey key = keyGene.generateKey(); byte[] bytes = key.getEncoded(); SecretKeySpec keySpec = new SecretKeySpec(bytes, "AES"); Cipher ciper = Cipher.getInstance("AES"); ciper.init(Cipher.ENCRYPT_MODE, keySpec); bytes = ciper.doFinal("hello".getBytes()); String result = org.apache.commons.codec.binary.Base64.encodeBase64String(bytes);            
            return result; } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); } catch (InvalidKeyException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } return null; }

 解密AES

String randomKey = "12345678";    

  public static String DEAES(String str) { try { byte[] srcBytes = org.apache.commons.codec.binary.Base64 .decodeBase64(str); KeyGenerator keyGene = KeyGenerator.getInstance("AES"); keyGene.init(128, new SecureRandom(randomKey.getBytes())); SecretKey key = keyGene.generateKey(); byte[] bytes = key.getEncoded(); SecretKeySpec keySpec = new SecretKeySpec(bytes, "AES"); Cipher ciper = Cipher.getInstance("AES"); ciper.init(Cipher.DECRYPT_MODE, keySpec); bytes = ciper.doFinal(srcBytes); String strs = new String(bytes); return strs; } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); } catch (InvalidKeyException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } return null; }

 

 

 DES 

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加密DES

String randomKey = "12345678";    

public static String ENDES() { SecureRandom random = new SecureRandom(); try { DESKeySpec desKey = new DESKeySpec(randomKey.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); SecretKey securekey = keyFactory.generateSecret(desKey); Cipher cipher = Cipher.getInstance("DES"); cipher.init(Cipher.ENCRYPT_MODE, securekey, random); byte[] bytes = cipher.doFinal("hello".getBytes()); String result = Base64.getEncoder().encodeToString(bytes); return result;
        } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (InvalidKeyException e) { e.printStackTrace(); } catch (InvalidKeySpecException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } return null; }

 

解密DES

String randomKey = "12345678"; 

public static String DEDES(String str) { byte[] bytes = Base64.getDecoder().decode(str); SecureRandom random = new SecureRandom(); try { DESKeySpec desKey = new DESKeySpec(randomKey.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); SecretKey securekey = keyFactory.generateSecret(desKey); Cipher cipher = Cipher.getInstance("DES"); cipher.init(Cipher.DECRYPT_MODE, securekey, random); bytes = cipher.doFinal(bytes); String result = new String(bytes); return result; } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (InvalidKeyException e) { e.printStackTrace(); } catch (InvalidKeySpecException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } return null; }

 

 

mian 方法

public static void main(String[] args) throws NoSuchAlgorithmException {  System.out.println("AES ENCRYPT:" + ENAES()); System.out.println("AES DECRYPT:" + DEAES(ENAES())); System.out.println("DES ENCRYPT:" + ENDES()); System.out.println("DES DECRYPT:" + DEDES(ENDES())); } 

 

運行結果

AES ENCRYPT:70IScgmG93zMpkKvsNs+TQ==
AES DECRYPT:hello
DES ENCRYPT:uhbGoCVxJa8=
DES DECRYPT:hello