Get the public key in CSR certificate file

For example, the csr certificate file contains a public key and the signature of the CA organization on this public key, so it is not a real public key to open the CSR file directly in text, and the real public key needs to be obtained in a certain way:

Public static string convertpemtopkcs10 Certification Request (string path) (

InputStream？ Input = new FileInputStream (path);

security . add provider(new org . bouncy castle . JCE . provider . bouncy castle provider())；

PEM reader PEM reader = new PEM reader(new InputStreamReader(input))；

PEM parser PEM parser = new PEM parser(PEM reader)；

pkcs 10 certification request CSR = null；

string writer output = new string writer()；

Try {

CSR = new pkcs 10 certification request(PEM parser . readpemobject()。 get content())；

Pembobject pkpemobject = new pemobject ("public key",

csr.getSubjectPublicKeyInfo()。 get encoded())；

Pemwriter pemwriter = new pemwriter (output);