微信小程序解密過程(java)
方法一java
package com.ecarpo.bms.wx.common;
import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Security;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
/**
* AES加密
* @author liuyazhuang
*
*/
public class AES {
public static boolean initialized = false;
/**
* AES解密
*
* @param content
* 密文
* @return
* @throws InvalidAlgorithmParameterException
* @throws NoSuchProviderException
*/
public byte[] decrypt(byte[] content, byte[] keyByte, byte[] ivByte) throws InvalidAlgorithmParameterException {
initialize();
try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
Key sKeySpec = new SecretKeySpec(keyByte, "AES");
cipher.init(Cipher.DECRYPT_MODE, sKeySpec, generateIV(ivByte));// 初始化
byte[] result = cipher.doFinal(content);
return result;
} 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();
} catch (NoSuchProviderException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
public static void initialize() {
if (initialized)
return;
Security.addProvider(new BouncyCastleProvider());
initialized = true;
}
// 生成iv
public static AlgorithmParameters generateIV(byte[] iv) throws Exception {
AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
params.init(new IvParameterSpec(iv));
return params;
}
}
package com.ecarpo.bms.wx.common;
import org.apache.commons.codec.binary.Base64;
import net.sf.json.JSONObject;
/**
* 封裝對外訪問方法
* @author liuyazhuang
*
*/
public class WXCore {
private static final String WATERMARK = "watermark";
private static final String APPID = "appid";
/**
* 解密數據
* @return
* @throws Exception
*/
public static String decrypt(String appId, String encryptedData, String sessionKey, String iv){
String result = "";
try {
AES aes = new AES();
byte[] resultByte = aes.decrypt(Base64.decodeBase64(encryptedData), Base64.decodeBase64(sessionKey), Base64.decodeBase64(iv));
if(null != resultByte && resultByte.length > 0){
result = new String(WxPKCS7Encoder.decode(resultByte));
JSONObject jsonObject = JSONObject.fromObject(result);
String decryptAppid = jsonObject.getJSONObject(WATERMARK).getString(APPID);
if(!appId.equals(decryptAppid)){
result = "";
}
}
} catch (Exception e) {
result = "";
e.printStackTrace();
}
return result;
}
public static void main(String[] args) throws Exception{
String appId = "wx4f4bc4dec97d474b";
String encryptedData = "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";
String sessionKey = "tiihtNczf5v6AKRyjwEUhQ==";
String iv = "r7BXXKkLb8qrSNn05n0qiA==";
System.out.println(decrypt(appId, encryptedData, sessionKey, iv));
}
}
package com.ecarpo.bms.wx.common;
import java.nio.charset.Charset;
import java.util.Arrays;
/**
* 微信小程序加解密
* @author liuyazhuang
*
*/
public class WxPKCS7Encoder {
private static final Charset CHARSET = Charset.forName("utf-8");
private static final int BLOCK_SIZE = 32;
/**
* 得到對明文進行補位填充的字節.
*
* @param count
* 須要進行填充補位操做的明文字節個數
* @return 補齊用的字節數組
*/
public static byte[] encode(int count) {
// 計算須要填充的位數
int amountToPad = BLOCK_SIZE - (count % BLOCK_SIZE);
if (amountToPad == 0) {
amountToPad = BLOCK_SIZE;
}
// 得到補位所用的字符
char padChr = chr(amountToPad);
String tmp = new String();
for (int index = 0; index < amountToPad; index++) {
tmp += padChr;
}
return tmp.getBytes(CHARSET);
}
/**
* 刪除解密後明文的補位字符
*
* @param decrypted
* 解密後的明文
* @return 刪除補位字符後的明文
*/
public static byte[] decode(byte[] decrypted) {
int pad = decrypted[decrypted.length - 1];
if (pad < 1 || pad > 32) {
pad = 0;
}
return Arrays.copyOfRange(decrypted, 0, decrypted.length - pad);
}
/**
* 將數字轉化成ASCII碼對應的字符，用於對明文進行補碼
*
* @param a
* 須要轉化的數字
* @return 轉化獲得的字符
*/
public static char chr(int a) {
byte target = (byte) (a & 0xFF);
return (char) target;
}
}
引入maven依賴:算法
package com.ecarpo.bms.wx.common;
import java.nio.charset.Charset;
import java.util.Arrays;
/**
* 微信小程序加解密
* @author liuyazhuang
*
*/
public class WxPKCS7Encoder {
private static final Charset CHARSET = Charset.forName("utf-8");
private static final int BLOCK_SIZE = 32;
/**
* 得到對明文進行補位填充的字節.
*
* @param count
* 須要進行填充補位操做的明文字節個數
* @return 補齊用的字節數組
*/
public static byte[] encode(int count) {
// 計算須要填充的位數
int amountToPad = BLOCK_SIZE - (count % BLOCK_SIZE);
if (amountToPad == 0) {
amountToPad = BLOCK_SIZE;
}
// 得到補位所用的字符
char padChr = chr(amountToPad);
String tmp = new String();
for (int index = 0; index < amountToPad; index++) {
tmp += padChr;
}
return tmp.getBytes(CHARSET);
}
/**
* 刪除解密後明文的補位字符
*
* @param decrypted
* 解密後的明文
* @return 刪除補位字符後的明文
*/
public static byte[] decode(byte[] decrypted) {
int pad = decrypted[decrypted.length - 1];
if (pad < 1 || pad > 32) {
pad = 0;
}
return Arrays.copyOfRange(decrypted, 0, decrypted.length - pad);
}
/**
* 將數字轉化成ASCII碼對應的字符，用於對明文進行補碼
*
* @param a
* 須要轉化的數字
* @return 轉化獲得的字符
*/
public static char chr(int a) {
byte target = (byte) (a & 0xFF);
return (char) target;
}
}
方法二apache
package com.ecarpo.bms.wx.utils;
import java.io.UnsupportedEncodingException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
public class WxAESUtils {
//算法名稱
final String KEY_ALGORITHM = "AES";
// 加解密算法/模式/填充方式
final String algorithmStr = "AES/CBC/PKCS7Padding";
private Key key;
private Cipher cipher;
/**
* 解密
*
* @param encryptedDataStr
* @param keyBytesStr
* @param ivStr
* @return
* @author wangyue
* @since 2018.08.15
*/
public byte[] decrypt(String encryptedDataStr, String keyBytesStr, String ivStr) {
byte[] encryptedText = null;
byte[] encryptedData = null;
byte[] sessionkey = null;
byte[] iv = null;
try {
sessionkey = Base64.decodeBase64(keyBytesStr);
encryptedData = Base64.decodeBase64(encryptedDataStr);
iv = Base64.decodeBase64(ivStr);
init(sessionkey);
cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
encryptedText = cipher.doFinal(encryptedData);
} catch (Exception e) {
e.printStackTrace();
}
return encryptedText;
}
public void init(byte[] keyBytes) {
// 若是密鑰不足16位，那麼就補足. 這個if 中的內容很重要
int base = 16;
if (keyBytes.length % base != 0) {
int groups = keyBytes.length / base + (keyBytes.length % base != 0 ? 1 : 0);
byte[] temp = new byte[groups * base];
Arrays.fill(temp, (byte) 0);
System.arraycopy(keyBytes, 0, temp, 0, keyBytes.length);
keyBytes = temp;
}
// 初始化
Security.addProvider(new BouncyCastleProvider());
// 轉化成JAVA的密鑰格式
key = new SecretKeySpec(keyBytes, KEY_ALGORITHM);
try {
// 初始化cipher
cipher = Cipher.getInstance(algorithmStr);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
WxAESUtils s = new WxAESUtils();
String encryptedDataStr = "CiyLU1Aw2KjvrjMdj8YKliAjtP4gsMZM\"\n"
+ " \"QmRzooG2xrDcvSnxIMXFufNstNGTyaGS\"\n"
+ " \"9uT5geRa0W4oTOb1WT7fJlAC+oNPdbB+\"\n"
+ " \"3hVbJSRgv+4lGOETKUQz6OYStslQ142d\"\n"
+ " \"NCuabNPGBzlooOmB231qMM85d2/fV6Ch\"\n"
+ " \"evvXvQP8Hkue1poOFtnEtpyxVLW1zAo6\"\n"
+ " \"/1Xx1COxFvrc2d7UL/lmHInNlxuacJXw\"\n"
+ " \"u0fjpXfz/YqYzBIBzD6WUfTIF9GRHpOn\"\n"
+ " \"/Hz7saL8xz+W//FRAUid1OksQaQx4CMs\"\n"
+ " \"8LOddcQhULW4ucetDf96JcR3g0gfRK4P\"\n"
+ " \"C7E/r7Z6xNrXd2UIeorGj5Ef7b1pJAYB\"\n"
+ " \"6Y5anaHqZ9J6nKEBvB4DnNLIVWSgARns\"\n"
+ " \"/8wR2SiRS7MNACwTyrGvt9ts8p12PKFd\"\n"
+ " \"lqYTopNHR1Vf7XjfhQlVsAJdNiKdYmYV\"\n"
+ " \"oKlaRv85IfVunYzO0IKXsyl7JCUjCpoG\"\n"
+ " \"20f0a04COwfneQAGGwd5oa+T8yO5hzuy\"\n" + " \"Db/XcxxmK01EpqOyuxINew==";
String keyBytesStr = "tiihtNczf5v6AKRyjwEUhQ==";
String ivStr = "r7BXXKkLb8qrSNn05n0qiA==";
byte[] decrypt = s.decrypt(encryptedDataStr, keyBytesStr, ivStr);
String str;
try {
str = new String(decrypt, "utf-8");
System.out.println(str);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
}
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