微信支付发起退款时解析p12文件失败，报错：

java.io.IOException: toDerInputStream rejects tag type 0

at sun.security.util.DerValue.toDerInputStream(DerValue.java:847)

at sun.security.pkcs12.PKCS12KeyStore.engineLoad(PKCS12KeyStore.java:1915)

at java.security.KeyStore.load(KeyStore.java:1445)

代码：

keyStore.load(inputStream, mchId.toCharArray());