java AES 加密与解密

  1. package com.ss.util.secret;
     
    import java.io.UnsupportedEncodingException;
    import java.security.InvalidKeyException;
    import java.security.NoSuchAlgorithmException;
    import javax.crypto.BadPaddingException;
    import javax.crypto.Cipher;
    import javax.crypto.IllegalBlockSizeException;
    import javax.crypto.KeyGenerator;
    import javax.crypto.NoSuchPaddingException;
    import javax.crypto.SecretKey;
    import javax.crypto.spec.SecretKeySpec;
     
    /**
    **
    * AES128 算法,加密模式为ECB,填充模式为 pkcs7(实际就是pkcs5)
    *
    *
    */
    public class AESUtils {
     
    /**
    * 加密
    *
    * @param content 需要加密的内容
    * @param key 加密密码
    * @return
    */
    public static byte[] encrypt(String content, String key) {
    try {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    kgen.init(128, new java.security.SecureRandom(key.getBytes()));
    SecretKey secretKey = kgen.generateKey();
    byte[] enCodeFormat = secretKey.getEncoded();
    SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");
    Cipher cipher = Cipher.getInstance("AES");// 创建密码器
    byte[] byteContent = content.getBytes("UTF-8");
    cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);// 初始化
    byte[] result = cipher.doFinal(byteContent);
    return result; // 加密
    } catch (NoSuchAlgorithmException e) {
    e.printStackTrace();
    } catch (NoSuchPaddingException e) {
    e.printStackTrace();
    } catch (InvalidKeyException e) {
    e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
    e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
    e.printStackTrace();
    } catch (BadPaddingException e) {
    e.printStackTrace();
    }
    return null;
    }
     
    /**解密
    * @param content 待解密内容
    * @param key 解密密钥
    * @return
    */
    public static byte[] decrypt(byte[] content, String key) {
    try {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    kgen.init(128, new java.security.SecureRandom(key.getBytes()));
    SecretKey secretKey = kgen.generateKey();
    byte[] enCodeFormat = secretKey.getEncoded();
    SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");
    Cipher cipher = Cipher.getInstance("AES");// 创建密码器
    cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);// 初始化
    byte[] result = cipher.doFinal(content);
    return result; // 加密
    } 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;
    }
     
    /**
    * 字符串加密
    * @param content 要加密的字符串
    * @param key 加密的AES Key
    * @return
    */
    public static String encryptString(String content, String key) {
    return parseByte2HexStr( encrypt(content, key));
    }
     
    /**
    * 字符串解密
    * @param content 要解密的字符串
    * @param key 解密的AES Key
    * @return
    */
    public static String decryptString(String content, String key){
    byte[] decryptFrom = parseHexStr2Byte(content);
    byte[] decryptResult = decrypt(decryptFrom,key);
    return new String(decryptResult);
    }
     
     
    /**将16进制转换为二进制
    * @param hexStr
    * @return
    */
    public static byte[] parseHexStr2Byte(String hexStr) {
    if (hexStr.length() < 1)
    return null;
    byte[] result = new byte[hexStr.length()/2];
    for (int i = 0;i< hexStr.length()/2; i++) {
    int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);
    int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);
    result[i] = (byte) (high * 16 + low);
    }
    return result;
    }
     
     
    /**将二进制转换成16进制
    * @param buf
    * @return
    */
    public static String parseByte2HexStr(byte buf[]) {
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < buf.length; i++) {
    String hex = Integer.toHexString(buf[i] & 0xFF);
    if (hex.length() == 1) {
    hex = '0' + hex;
    }
    sb.append(hex.toUpperCase());
    }
    return sb.toString();
    }
     
    public static void main(String aregs[]){
    String content = "协议加密Test&123";
    String key = "25d55ad283aa400af464c76d713c07ad";
    try {
    //加密
    System.out.println("加密前:" + content);
    String encrypt = AESUtils.encryptString(content, key);
    System.out.println("加密后:" + encrypt);
    //解密
    String decrypt = AESUtils.decryptString(encrypt, key);
    System.out.println("解密后:" + decrypt);
    } catch (Exception e) {
    e.printStackTrace();
    }
     
    }
    }

 

运行结果:

 

加密前:协议加密Test&123
加密后:7D07155438880C51E50433C17D9AFF8DCB2A9596AF46B2ABA33C18918053E3E0
解密后:协议加密Test&123

 
 
posted @ 2016-12-08 15:55  ding9587  阅读(446)  评论(0编辑  收藏  举报