介紹

微信demo下載下來發現沒有Java版本，只能再找資料解密

我的Java解密程式碼是這樣寫的，可以用

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.AlgorithmParameterSpec;

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.apache.commons.codec.binary.Base64;

public class MyAESUtil {
  public static String decryptWXAppletInfo(String sessionKey, String encryptedData, String iv)
      throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
      InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
    String result = null;
 

    byte[] encrypData = Base64.decodeBase64(encryptedData);
    byte[] ivData = Base64.decodeBase64(iv);
    byte[] sessionKeyB = Base64.decodeBase64(sessionKey);

    AlgorithmParameterSpec ivSpec = new IvParameterSpec(ivData);
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    SecretKeySpec keySpec = new SecretKeySpec(sessionKeyB, "AES"
 
);
    cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
    byte[] doFinal = cipher.doFinal(encrypData);
    result = new String(doFinal);
    return result;
  }
}

依賴包：

        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.9</version>
        </dependency>