Mega Code Archive
Use of X509EncodedKeySpec
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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
*/
]]>