AES-256-ECB PKCS7Padding 解密微信退款接口

我就是我 2021-09-28 05:50 458阅读 0赞

不说别的了，直接说解密  
1解密方式  
解密步骤如下：  
（1）对加密串A做base64解码，得到加密串B  
（2）对商户key做md5，得到32位小写key\* ( key设置路径：微信商户平台([pay.weixin.qq.com][])–>账户设置–>API安全–>密钥设置 )

（3）用key\*对加密串B做AES-256-ECB解密（PKCS7Padding）

解密AES-256-ECB在java中还是挺麻烦的，jdk默认支持128加密 ，资料也不好搜索，我整理了一下

使用commons-codec解码base64  
使用bouncycastle解密AES-256-ECB

直接运行就可以看效果

需要的pom

<dependency>
    		    <groupId>commons-codec</groupId>
    		    <artifactId>commons-codec</artifactId>
    		    <version>1.11</version>
    		</dependency>
    		
    	
    		<dependency>
    		    <groupId>org.bouncycastle</groupId>
    		    <artifactId>bcprov-jdk15on</artifactId>
    		    <version>1.60</version>
    		</dependency>

1 Base64解密

import org.apache.commons.codec.binary.Base64;
    public class BASE64Util {
    	 /**
    	  * 进行Base64解密 
    	  * @param binaryData
    	  * @return
    	  * @throws Exception
    	  */
        public static byte[] decodeBase64(String binaryData) throws Exception {  
        	  byte[] result = Base64.decodeBase64(binaryData.getBytes());  
            return  result;  
        }  
        /**
         * 进行Base64加密
         * @param binaryData
         * @return
         * @throws Exception
         */
        public static byte[] encodeBase64(byte[] binaryData) throws Exception {  
      	  byte[] result = Base64.encodeBase64(binaryData);
          return  result;  
      }  
    }

2，MD5加密

import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    
    public class MD5Util {
    
    	 public static String MD532(String plainText) {  
    	        try {  
    	            MessageDigest md = MessageDigest.getInstance("MD5");  
    	            md.update(plainText.getBytes());  
    	            byte b[] = md.digest();  
    	            int i;  
    	            StringBuffer buf = new StringBuffer("");  
    	            for (int offset = 0; offset < b.length; offset++) {  
    	                i = b[offset];  
    	                if (i < 0)  
    	                    i += 256;  
    	                if (i < 16)  
    	                    buf.append("0");  
    	                buf.append(Integer.toHexString(i));  
    	            }  
    	            //32位加密  
    	            return buf.toString();  
    	            // 16位的加密  
    	            //return buf.toString().substring(8, 24);  
    	        } catch (NoSuchAlgorithmException e) {  
    	            e.printStackTrace();  
    	            return null;  
    	        }  
    	    }  
    	 /**
    	  * 大写MD5
    	  * @param plainText
    	  * @return
    	  */
    	 public static String dxMD532(String plainText) {
    		return MD5Util.MD532(plainText).toUpperCase();  
    		 
    	 }
    	 
    		public static void main(String[] args) {
    			// TODO Auto-generated method stub
    			System.out.println("111");
    			System.out.println(MD5Util.MD532("1212"));
    			System.out.println(MD5Util.dxMD532("1212"));
    			
    		}
    }

3，对req\_info 做AES-256-ECB解密（PKCS7Padding）

import java.security.Security;
    import java.util.Map;
    
    import javax.crypto.Cipher;  
    import javax.crypto.spec.SecretKeySpec;  
      
    import org.bouncycastle.jce.provider.BouncyCastleProvider;  
     
     
    public class AESUtil {
    	
    	/**
    	 * 密钥算法
    	 */
    	private static final String ALGORITHM = "AES";
    	/**
    	 * 加解密算法/工作模式/填充方式
    	 */
    	private static final String ALGORITHM_MODE_PADDING = "AES/ECB/PKCS7Padding";
    	
    	static {
    		//Security.addProvider(new BouncyCastleProvider());
    		Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    	}
    	
    	/**
    	 * AES加密
    	 * 
    	 * @param data
    	 * @return
    	 * @throws Exception
    	 */
    	public static String encryptData(String data,String key) throws Exception {
    		// 创建密码器
    		Cipher cipher = Cipher.getInstance(ALGORITHM_MODE_PADDING, "BC");
    		SecretKeySpec secretKeySpec = new SecretKeySpec(MD5Util.MD532(key).getBytes(), ALGORITHM);
    		// 初始化
    		cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
    		return new String(BASE64Util.encodeBase64(cipher.doFinal(data.getBytes())));
    	}
     
    	/**
    	 * AES解密
    	 * 
    	 * @param base64Data
    	 * @return
    	 * @throws Exception
    	 */
    	public static String decryptData(String base64Data,String key) throws Exception {
    		Cipher cipher = Cipher.getInstance(ALGORITHM_MODE_PADDING, "BC");
    		SecretKeySpec secretKeySpec = new SecretKeySpec(MD5Util.MD532(key).getBytes(), ALGORITHM);
    		cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
    		return new String(cipher.doFinal(BASE64Util.decodeBase64(base64Data)));
    	}
     
    	public static void main(String[] args) throws Exception {
    		
    		String A="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";
    		A=AESUtil.decryptData(A,"3c6e0b8a9c15224a8228b9a98ca1531d");
    		System.out.println(A);
    
    	}
     
    }

[pay.weixin.qq.com]: http://pay.weixin.qq.com