java AES加密和解密支援密鑰

AesUtil工具類

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.StringUtils;
import sun.misc.BASE64Decoder;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
public class AesUtil {
    //密鑰 (需要前端和後端保持一緻)
    private static final String KEY = "123456";
    
    //偏移量
    private static final String IV = "123456";
    
    //算法
    private static final String ALGORITHMSTR = "AES/ECB/PKCS5Padding";

    /**
     * aes解密
     * @param encrypt   内容
     * @return
     * @throws Exception
     */
    public static String aesDecrypt(String encrypt) {
        try {
            return aesDecrypt(encrypt, KEY);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * aes加密
     * @param content
     * @return
     * @throws Exception
     */
    public static String aesEncrypt(String content) {
        try {
            return aesEncrypt(content, KEY);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * 将byte[]轉為各種進制的字元串
     * @param bytes byte[]
     * @param radix 可以轉換進制的範圍，從Character.MIN_RADIX到Character.MAX_RADIX，超出範圍後變為10進制
     * @return 轉換後的字元串
     */
    public static String binary(byte[] bytes, int radix){
        return new BigInteger(1, bytes).toString(radix);// 這裡的1代表正數
    }

    /**
     * base 64 encode
     * @param bytes 待編碼的byte[]
     * @return 編碼後的base 64 code
     */
    public static String base64Encode(byte[] bytes){
        return Base64.encodeBase64String(bytes);
    }

    /**
     * base 64 decode
     * @param base64Code 待解碼的base 64 code
     * @return 解碼後的byte[]
     * @throws Exception
     */
    public static byte[] base64Decode(String base64Code) throws Exception{
        return StringUtils.isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);
    }


    /**
     * AES加密
     * @param content 待加密的内容
     * @param encryptKey 加密密鑰
     * @return 加密後的byte[]
     * @throws Exception
     */
    public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);
        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(encryptKey.getBytes(), "AES"));

        return cipher.doFinal(content.getBytes("utf-8"));
    }


    /**
     * AES加密為base 64 code
     * @param content 待加密的内容
     * @param encryptKey 加密密鑰
     * @return 加密後的base 64 code
     * @throws Exception
     */
    public static String aesEncrypt(String content, String encryptKey) throws Exception {
        return base64Encode(aesEncryptToBytes(content, encryptKey));
    }

    /**
     * AES解密
     * @param encryptBytes 待解密的byte[]
     * @param decryptKey 解密密鑰
     * @return 解密後的String
     * @throws Exception
     */
    public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);

        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(), "AES"));
        byte[] decryptBytes = cipher.doFinal(encryptBytes);
        return new String(decryptBytes);
    }


    /**
     * 将base 64 code AES解密
     * @param encryptStr 待解密的base 64 code
     * @param decryptKey 解密密鑰
     * @return 解密後的string
     * @throws Exception
     */
    public static String aesDecrypt(String encryptStr, String decryptKey) throws Exception {
        return StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
    }
    
    
    /**
     * AES解密
     * @param content   密文
     * @return          
     */
    public static String AES_CBC_Decrypt(String content){  
        try{  
        	content = content.replaceAll(" ", "+");
        	byte[] decryptBaseData=Base64.decodeBase64(content.getBytes("utf-8"));
            SecretKeySpec key = new SecretKeySpec(KEY.getBytes(), "AES");
            Cipher cipher=Cipher.getInstance("AES/CBC/PKCS5Padding");  
            cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(IV.getBytes()));  
            byte[] result=cipher.doFinal(decryptBaseData);  
            return new String(result);  
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
			e.printStackTrace();
		}   
        return null;  
    } 	
    
    
    /**
	 * AES加密
	 * @param content  明文
	 * @return   
	 */
    public static String AES_CBC_Encrypt(String content){  
          
        try{ 
            SecretKeySpec key = new SecretKeySpec(KEY.getBytes(), "AES");
            Cipher cipher=Cipher.getInstance("AES/CBC/PKCS5Padding");  
            cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(IV.getBytes()));  
            byte[] result=cipher.doFinal(content.getBytes()); 
            return new String(Base64.encodeBase64(result),"UTF-8");
        }catch (Exception e) {  
            System.out.println("exception:"+e.toString());  
        }   
        return null;  
    }
           

}

支援密鑰方式

/**
     * 測試
     */
    public static void main(String[] args) throws Exception {

        String content = "{\n" +
                "\t\"name\":5,\n" +
                "\t\"sex\":6,\n" +
                "\t\"gander\":7\n" +
                "}";
        System.out.println("加密前：" + content);
        System.out.println("加密密鑰和解密密鑰：" + "C824yf1565602024");
        String encrypt = aesEncrypt(content, "C824yf1565602024");
        System.out.println("加密後：" + encrypt);


        String decrypt = aesDecrypt(encrypt, "C824yf1565602024");
        System.out.println("解密後：" + decrypt);
    }
           

不支援密鑰方式

/**
     * 測試
     */
    public static void main(String[] args) throws Exception {

       String content = "{\n" +
                "\t\"lesson_id\":5,\n" +
                "\t\"speaker_id\":6,\n" +
                "\t\"audience_id\":7\n" +
                "}";

        String encrypt = AES_CBC_Encrypt(content);
        System.out.println("加密：" + encrypt);
        String a=AES_CBC_Decrypt(encrypt);
    	System.out.println("解密:"+ a);
    }