• (转)Java DES 与Base64


     原文地址http://blog.csdn.net/tomatozq/article/details/20773559

    1,DES

        /** 
                 * 解密 
                 * @param message 
                 * @param key 
                 * @return 
                 * @throws Exception 
                 */  
                public static String decrypt(String message,String encoding) throws Exception {  
          
                    byte[] bytesrc = convertHexString(message);  
                    Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");  
                    DESKeySpec desKeySpec = new DESKeySpec(key.getBytes(encoding));  
                    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");  
                    SecretKey secretKey = keyFactory.generateSecret(desKeySpec);  
                    IvParameterSpec iv = new IvParameterSpec(key.getBytes(encoding));  
          
                    cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);  
          
                    byte[] retByte = cipher.doFinal(bytesrc);  
                    return new String(retByte,encoding);  
                }  
          
                /** 
                 * 加密 
                 * @param message 
                 * @param key 
                 * @return 
                 * @throws Exception 
                 */  
                public static String encrypt(String message,String encoding) throws Exception {  
                    Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");  
          
                    DESKeySpec desKeySpec = new DESKeySpec(key.getBytes(encoding));  
          
                    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");  
                    SecretKey secretKey = keyFactory.generateSecret(desKeySpec);  
                    IvParameterSpec iv = new IvParameterSpec(key.getBytes(encoding));  
                    cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);  
          
                    byte[] buf = cipher.doFinal(message.getBytes(encoding));  
                      
                    String a = toHexString(buf).toUpperCase();  
                      
                    return a;  
                }  
          
                /** 
                 * 字符串转换为16进制数组 
                 * @param ss 
                 * @return 
                 */  
                public static byte[] convertHexString(String ss) {  
                    byte digest[] = new byte[ss.length() / 2];  
                    for (int i = 0; i < digest.length; i++) {  
                        String byteString = ss.substring(2 * i, 2 * i + 2);  
                        int byteValue = Integer.parseInt(byteString, 16);  
                        digest[i] = (byte) byteValue;  
                    }  
          
                    return digest;  
                }  
                  
                /** 
                 * 16进制数组转换为字符串 
                 * @param b 
                 * @return 
                 */  
                public static String toHexString(byte b[]) {  
                    StringBuffer hexString = new StringBuffer();  
                    for (int i = 0; i < b.length; i++) {  
                        String plainText = Integer.toHexString(0xff & b[i]);  
                        if (plainText.length() < 2)  
                            plainText = "0" + plainText;  
                        hexString.append(plainText);  
                    }  
          
                    return hexString.toString();  
                }  
    

    2,Base64

        byte[] enc = Base64.encode(encText.getBytes(encoding), Base64.DEFAULT);  
        byte[] bytesrc = Base64.decode(encText.getBytes(encoding), Base64.DEFAULT);  
    

      

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  • 原文地址:https://www.cnblogs.com/hhhh2010/p/4088255.html
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