MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Security;
import java.security.spec.X509EncodedKeySpec;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.util.ASN1Dump;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;

public class MainClass {
    public static void main(String[] args) throws Exception {
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
        KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "BC");

        generator.initialize(128, new SecureRandom());
        KeyPair pair = generator.generateKeyPair();
        ASN1InputStream aIn = new ASN1InputStream(pair.getPublic().getEncoded());
        SubjectPublicKeyInfo info = SubjectPublicKeyInfo.getInstance(aIn.readObject());

        System.out.println(ASN1Dump.dumpAsString(info));
        System.out.println(ASN1Dump.dumpAsString(info.getPublicKey()));

        X509EncodedKeySpec x509Spec = new X509EncodedKeySpec(pair.getPublic().getEncoded());
        KeyFactory keyFact = KeyFactory.getInstance("RSA", "BC");
        PublicKey pubKey = keyFact.generatePublic(x509Spec);

        System.out.println(pubKey.equals(pair.getPublic()));
    }
}
/*
DER Sequence
DER Sequence
    ObjectIdentifier(1.2.840.113549.1.1.1)
    NULL
DER Bit String[26, 0] 
    
DER Sequence
Integer(171211678289811562909793981152149017387)
Integer(65537)
    
true
    
 */