节点。js加密签名和openssl签名不匹配

I wanted to perform RSA-SHA512 on a file in node.js. I could calculate sha512 hash of the given data file which matches with that of openssl's. However when trying to get the digital signature on the same hash, node.js signature differs from openssl signature. Below is an example code snippet:I wanted to perform RSA-SHA512 on a file in nod