Hello.. I just need a help from you all,
I am integrating Salesforce with GST Portal (2 way connection) via Rest Integration. I am stuck with Public Key Encryption Method. 
If you have already worked on it , pls let me know. Your help means alot.
 

I have to convert the java class into apex  for API Integration.
I stuck with to create a public key. The Public key file is in PEM File format. By using RSA I have to convert to apex class. 

What is the equivalent code for X509EncodedKeySpec & keyFactory Java method in apex class to create a public key using RSA Algorithm? 

Hello.. I just need a help from you all,
I am integrating Salesforce with GST Portal (2 way connection) via Rest Integration. I am stuck with Public Key Encryption Method. 
If you have already worked on it , pls let me know. Your help means alot.