java Aes 加密解密 字符串与字节数组转换

package com.duowan.yy.sysop.aes.decrypt;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

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.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
/**
 * AES 加密/解密操作
 *
 * 加密思想 ： 将二进制数据转换为16进制保存在数据库(为防止出错)   加密算法为 AES
 *
 * CRM 项目使用的是 NOpadding 模式(param:content,key,iv)
 * @author Administrator
 *
 */
public class AEScrypt {



    /**
     *
     * @param content 加密对象
     * @param key 密钥
     * @param iv IV
     * @return
     * @throws Exception
     */
    public static byte[] encrypt(String content,String key,String iv) throws Exception {
        try {

            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");

            int len = content.getBytes("UTF-8").length;
            int m = len % 16;
            if (m != 0) {
	            for (int i = 0; i < 16 - m; i++) {
	            	content += " ";
	            }
	        }
            byte[] dataBytes = content.getBytes();
            int plaintextLength = dataBytes.length;

            byte[] plaintext = new byte[plaintextLength];
            System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);

            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
            byte[] encrypted = cipher.doFinal(plaintext);

            return encrypted;

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     *
     * @param content 解密内容
     * @param key 解密密钥
     * @param iv IV
     * @return
     * @throws Exception
     */
    public static byte[] desEncrypt(byte[] content,String key,String iv) throws Exception {
        try
        {
            byte[] encrypted1 = content;

            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

            byte[] original = cipher.doFinal(encrypted1);

            return original;
        }
        catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


    /**解密
     * @param content  待解密内容
     * @param password 解密密钥
     * @return
     */
    public static byte[] decrypt(byte[] content, String password) {
            try {
                     KeyGenerator kgen = KeyGenerator.getInstance("AES");
                     kgen.init(128, new SecureRandom(password.getBytes()));
                     SecretKey secretKey = kgen.generateKey();
                     byte[] enCodeFormat = secretKey.getEncoded();
                     SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
                     Cipher cipher = Cipher.getInstance("AES");// 创建密码器
                    cipher.init(Cipher.DECRYPT_MODE, key);// 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;
    }

    /**
     * 加密
     *
     * @param content 需要加密的内容
     * @param password  加密密码
     * @return
     */
    public static byte[] encrypt(String content, String password) {
            try {
                    KeyGenerator kgen = KeyGenerator.getInstance("AES");
                    kgen.init(128, new SecureRandom(password.getBytes()));
                    SecretKey secretKey = kgen.generateKey();
                    byte[] enCodeFormat = secretKey.getEncoded();
                    SecretKeySpec key = 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, key);// 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;
    }


    /**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();
	}

	/*
	* @return true---是Windows操作系统
	*/
	public static boolean isWindowsOS(){
	    boolean isWindowsOS = false;
	    String osName = System.getProperty("os.name");
	    if(osName.toLowerCase().indexOf("windows")>-1){
	      isWindowsOS = true;
	    }
	    return isWindowsOS;
	 }

	/**
	* 功能：判断一个字符串是否包含特殊字符
	* @param string 要判断的字符串
	* @return true 只包含指定字符范围 返回true
	*
	* @return false 含有指定字符之外的 返回false
	*/
	public static boolean isConSpeCharacters(String string) {
	   // TODO Auto-generated method stub
	   if(string.replaceAll("[a-z]*[A-Z]*[0-9]", "").length()==0){
	    //如果不包含特殊字符
	    return true;
	   }
	   return false;
	}

	public static boolean isMobiles(String string) {
		   // TODO Auto-generated method stub
		   if(string.replaceAll("[0-9]|-|-", "").trim().length()==0){
		    //如果不包含特殊字符
		    return true;
		   }
		   return false;
		}

	public static boolean isCharacter(String string) {
		   // TODO Auto-generated method stub
		   if(string.replaceAll("[a-z][A-Z]", "").trim().length()==0){
		    //如果不包含特殊字符
		    return true;
		   }
		   return false;
		}

}