微信小程序解密过程(java)

方法一

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 blocke.printStackTrace();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}public static void initialize() {if (initialized)return;Security.addProvider(new BouncyCastleProvider());initialized = true;}// 生成ivpublic 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;/*** 封装对外访问方法* @author liuyazhuang**/
public class WXCore {private static final String WATERMARK = "watermark";private static final String APPID = "appid";/*** 解密数据* @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;/*** 获得对明文进行补位填充的字节.** @param count*            需要进行填充补位操作的明文字节个数* @return 补齐用的字节数组*/public static byte[] encode(int count) {// 计算需要填充的位数int amountToPad = BLOCK_SIZE - (count % BLOCK_SIZE);if (amountToPad == 0) {amountToPad = BLOCK_SIZE;}// 获得补位所用的字符char padChr = chr(amountToPad);String tmp = new String();for (int index = 0; index < amountToPad; index++) {tmp += padChr;}return tmp.getBytes(CHARSET);}/*** 删除解密后明文的补位字符** @param decrypted*            解密后的明文* @return 删除补位字符后的明文*/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);}/*** 将数字转化成ASCII码对应的字符，用于对明文进行补码** @param a*            需要转化的数字* @return 转化得到的字符*/public static char chr(int a) {byte target = (byte) (a & 0xFF);return (char) target;}
}

　　引入maven依赖:

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;/*** 获得对明文进行补位填充的字节.** @param count*            需要进行填充补位操作的明文字节个数* @return 补齐用的字节数组*/public static byte[] encode(int count) {// 计算需要填充的位数int amountToPad = BLOCK_SIZE - (count % BLOCK_SIZE);if (amountToPad == 0) {amountToPad = BLOCK_SIZE;}// 获得补位所用的字符char padChr = chr(amountToPad);String tmp = new String();for (int index = 0; index < amountToPad; index++) {tmp += padChr;}return tmp.getBytes(CHARSET);}/*** 删除解密后明文的补位字符** @param decrypted*            解密后的明文* @return 删除补位字符后的明文*/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);}/*** 将数字转化成ASCII码对应的字符，用于对明文进行补码** @param a*            需要转化的数字* @return 转化得到的字符*/public static char chr(int a) {byte target = (byte) (a & 0xFF);return (char) target;}
}

方法二

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 {//算法名称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) {// 如果密钥不足16位，那么就补足. 这个if 中的内容很重要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());// 转化成JAVA的密钥格式key = new SecretKeySpec(keyBytes, KEY_ALGORITHM);try {// 初始化ciphercipher = 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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