java微信小程序解密AES/CBC/PKCS7Padding

• 摘要：微信小程序解密建议使用1.6及以上的环境使用maven下载jar包org.bouncycastlebcprov-jdk15on1.55加密类代码importorg.bouncycastle.jce.provider.BouncyCastleProvider;importorg.bouncycastle.util.Arrays;importjavax.crypto.Cipher;importjavax.crypto.NoSuchPaddingException;importja

• 微信小程序解密

  建议使用1.6及以上的环境

  使用maven下载jar包

  org.bouncycastle 
  bcprov-jdk15on 
  1.55

  加密类代码

  import org.bouncycastle.jce.provider.BouncyCastleProvider;
  import org.bouncycastle.util.Arrays;
  import javax.crypto.Cipher;
  import javax.crypto.NoSuchPaddingException;
  import javax.crypto.spec.IvParameterSpec;
  import javax.crypto.spec.SecretKeySpec;
  import java.security.Key;
  import java.security.NoSuchAlgorithmException;
  import java.security.NoSuchProviderException;
  import java.security.Security;
  /**
  * Created by wind on 2016/12/24.
  */
  /**
  *
  * @author ngh
  * AES128 算法
  *
  * CBC 模式
  *
  * PKCS7Padding 填充模式
  *
  * CBC模式需要添加一个参数iv--对称解密算法初始向量 iv
  *
  * 介于java 不支持PKCS7Padding,只支持PKCS5Padding 但是PKCS7Padding 和 PKCS5Padding 没有什么区别
  * 要实现在java端用PKCS7Padding填充,需要用到bouncycastle组件来实现
  */
  public class Pkcs7Encoder {
  // 算法名称
  static final String KEY_ALGORITHM = "AES";
  // 加解密算法/模式/填充方式
  static final String algorithmStr = "AES/CBC/PKCS7Padding";
  private static Key key;
  private static Cipher cipher;
  boolean isInited = false;
  //默认对称解密算法初始向量 iv
  static byte[] iv = { 0x30, 0x31, 0x30, 0x32, 0x30, 0x33, 0x30, 0x34, 0x30, 0x35, 0x30, 0x36, 0x30, 0x37, 0x30, 0x38 };
  public static 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cipher
  cipher = Cipher.getInstance(algorithmStr, "BC");
  } catch (NoSuchAlgorithmException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  } catch (NoSuchPaddingException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  } catch (NoSuchProviderException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  }
  /**
  * 加密方法
  * --使用默认iv时
  * @param content
  * 要加密的字符串
  * @param keyBytes
  * 加密密钥
  * @return
  */
  public static byte[] encrypt(byte[] content, byte[] keyBytes) {
  byte[] encryptedText = encryptOfDiyIV(content,keyBytes,iv);
  return encryptedText;
  } /**
  * 解密方法
  * --使用默认iv时
  * @param encryptedData
  * 要解密的字符串
  * @param keyBytes
  * 解密密钥
  * @return
  */
  public static byte[] decrypt(byte[] encryptedData, byte[] keyBytes) {
  byte[] encryptedText = decryptOfDiyIV(encryptedData,keyBytes,iv);
  return encryptedText;
  }
  /**
  * 加密方法
  * ---自定义对称解密算法初始向量 iv
  * @param content
  * 要加密的字符串
  * @param keyBytes
  * 加密密钥
  * @param ivs
  * 自定义对称解密算法初始向量 iv
  * @return 加密的结果
  */
  public static byte[] encryptOfDiyIV(byte[] content, byte[] keyBytes, byte[] ivs) {
  byte[] encryptedText = null;
  init(keyBytes);
  System.out.println("IV:" + new String(ivs));
  try {
  cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(ivs));
  encryptedText = cipher.doFinal(content);
  } catch (Exception e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  return encryptedText;
  }
  /**
  * 解密方法
  *
  * @param encryptedData
  * 要解密的字符串
  * @param keyBytes
  * 解密密钥
  * @param ivs
  * 自定义对称解密算法初始向量 iv
  * @return
  */
  public static byte[] decryptOfDiyIV(byte[] encryptedData, byte[] keyBytes,byte[] ivs) {
  byte[] encryptedText = null;
  init(keyBytes);
  System.out.println("IV:" + new String(ivs));
  try {
  cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(ivs));
  encryptedText = cipher.doFinal(encryptedData);
  } catch (Exception e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  return encryptedText;
  }
  }

  测试类

  public class Test {
  public static void main(String[] args) throws Exception { String encryptedData = "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";
  String iv="r7BXXKkLb8qrSNn05n0qiA==";
  String sessionKey = "tiihtNczf5v6AKRyjwEUhQ==";
  toStr(sessionKey,encryptedData,iv);
  }
  private static void toStr(String sessionKey,String encryptedData ,String iv) throws Exception{
  byte[] sessionKeyBy = BASE64.decryptBASE64(sessionKey.getBytes());
  byte[] encryptedDataBy = BASE64.decryptBASE64(encryptedData.getBytes());
  byte[] ivBy = BASE64.decryptBASE64(iv.getBytes());
  byte[] dec = Pkcs7Encoder.decryptOfDiyIV(encryptedDataBy, sessionKeyBy,ivBy);
  System.out.println(new String(dec));
  }
  } 
  测试类中的Base64 带测试方法 
  import org.apache.commons.codec.binary.Base64;
  /** * BASE64加密解密 */ public class BASE64 { /** * BASE64解密 * @param key * @return * @throws Exception */ public static byte[] decryptBASE64(byte[] key) throws Exception { return (new Base64()).decode(key); } /** * BASE64加密 * @param key * @return * @throws Exception */ public static byte[] encryptBASE64(byte[] key) throws Exception { return (new Base64()).encode(key); } public static void main(String[] args) throws Exception { byte[] data = BASE64.encryptBASE64("http://aub.iteye.com/".getBytes()); System.out.println("加密前:" + new String(data)); byte[] byteArray = BASE64.decryptBASE64(data); System.out.println("解密后:" + new String(byteArray)); } } 完成

  会出现的一些错误:

  cannot load mian class

  打包成jar包以后,在正式运行执行:java bcprov-jdk150on-1.55.jar之前,需要删除 .jar包中的一个文件:META-INF/BCKEY.DSA

  no such provider: BC 
  在jdk中的jre/lib/security修改java.security文件, security.provider.6=com.sun.security.sasl.Provider 下面添加 security.provider.7=org.bouncycastle.jce.provider.BouncyCastleProvider
  在/jre/lib/ext中添加bcprov-jdk15-135.jar的jar包
  bcprov-jdk16-143.jar提供加密,解密,生成密钥对等方法 
  下载网址:http://download.csdn.net/download/tomliguocai/3945936

  文章大部分代码来自http://windcoder.com/jinjiweixinxiaochengxu-javabanaescbcpkcs7paddingjiajiemizifuchuan/