Java Tutorial/Security/X509EncodedKeySpec

use of X509EncodedKeySpec

   <source lang="java">

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

*/</source>