无法解密获取到的手机号

文档地址：https://developer.umeng.com/docs/143070/detail/144783

使用官方例程解密，无论是[RSA](https://docs-aliyun.cn-hangzhou.oss.aliyun-inc.com/assets/attach/144783/UMDP_zh/1614771418356/%E8%A7%A3%E5%AF%86%E6%89%8B%E6%9C%BA%E5%8F%B7RSA.zip)还是[ECC](https://docs-aliyun.cn-hangzhou.oss.aliyun-inc.com/assets/attach/144783/UMDP_zh/1614771400682/%E8%A7%A3%E5%AF%86%E6%89%8B%E6%9C%BA%E5%8F%B7ECC.zip)，都会在`string2PrivateKey`方法中报错，具体内容如下：

Exception in thread "main" java.security.spec.InvalidKeySpecException: encoded key spec not recognized: failed to construct sequence from byte[]: Extra data detected in stream
	at org.bouncycastle.jcajce.provider.asymmetric.util.BaseKeyFactorySpi.engineGeneratePrivate(Unknown Source)
	at org.bouncycastle.jcajce.provider.asymmetric.ec.KeyFactorySpi.engineGeneratePrivate(Unknown Source)
	at java.base/java.security.KeyFactory.generatePrivate(KeyFactory.java:383)
	at xxx.xxx.EccUtil.string2PrivateKey(EccUtil.java:24)
	at xxx.xxx.Entry.main(Entry.java:19)

代码：

public static ECPrivateKey string2PrivateKey(String priStr) throws Exception {
 byte[] keyBytes = base642Byte(priStr);
 PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
 KeyFactory keyFactory = KeyFactory.getInstance("EC", "BC");
 return (ECPrivateKey) keyFactory.generatePrivate(keySpec);
}

私钥是从后台直接点击复制然后粘贴到代码里的，入口代码如下：

public static void main(String[] args) throws Exception {
 String mobile = "zr5k+Iy/UROsG/wWEq2hJA==";
 String aesEncryptKey = "HgFPP+V4O4NYf9Ro1vOqBzl2xi9bdB44Xm72NRoC/goCr6F3EnC6bJlk2Kl1goH6BGHILEexxiQ7bbzayTKDPA==";
 String privateKeyStr = "xxxx"; // 直接复制的代码

 byte[] byteArr = EccUtil.privateDecrypt(EccUtil.base642Byte(aesEncryptKey),EccUtil.string2PrivateKey(privateKeyStr));
 //再用AES把mobile解密
 String mobileOrigin = new String(EccUtil.decryptAES(EccUtil.base642Byte(mobile), Entry.loadKeyAES(byteArr)));
 System.out.println(mobileOrigin);
}