微信小程序解密encryptedData报错

报错如下：javax.crypto.IllegalBlockSizeException: last block incomplete in decryption
at org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher.engineDoFinal(Unknown Source)
at javax.crypto.Cipher.doFinal(Cipher.java:2165)
at com.zhjd.app.API.AES.decrypt(AES.java:41)
at com.zhjd.marked.controller.WxController.login(WxController.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
工具类AES:
*/
public static 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);(此句为报错的语句AES.java:41)
        return result;
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
                    ......

    Controller:
    byte[] resultByte  = AES.decrypt(Base64.decodeBase64(encryptedData),
                Base64.decodeBase64(session_key),
                Base64.decodeBase64(iv));
                                    .....
                                    (其中byte[] resultByte  = AES.decrypt(Base64.decodeBase64(encryptedData),)这一行为报错句WxController.java:49

public static 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) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return encryptedText;
}

这个应该是没有解密出来正确的数据 原因是你获取的session_key ,不是加密时候用的那个session_key 我也遇到过这个情况 我的情况是前端获取的code
和得到的加密数据 两个请求顺序有问题 应该先拿到code 在获取加密的数据 这样你可以根据code获取最新的session_key 加密的数据也是经过刚获取的session_key 加密的