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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.
package org.bouncycastle.x509.examples;
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Security;
import java.security.cert.X509Certificate;
import java.security.spec.RSAPrivateCrtKeySpec;
import java.security.spec.RSAPublicKeySpec;
import java.util.Date;
import java.util.Hashtable;
import java.util.Vector;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.misc.MiscObjectIdentifiers;
import org.bouncycastle.asn1.misc.NetscapeCertType;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.jce.X509Principal;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.x509.AttributeCertificateHolder;
import org.bouncycastle.x509.AttributeCertificateIssuer;
import org.bouncycastle.x509.X509Attribute;
import org.bouncycastle.x509.X509V1CertificateGenerator;
import org.bouncycastle.x509.X509V2AttributeCertificate;
import org.bouncycastle.x509.X509V2AttributeCertificateGenerator;
import org.bouncycastle.x509.X509V3CertificateGenerator;
/**
* A simple example that generates an attribute certificate.
*/
public class AttrCertExample
{
static X509V1CertificateGenerator v1CertGen = new X509V1CertificateGenerator();
static X509V3CertificateGenerator v3CertGen = new X509V3CertificateGenerator();
/**
* we generate the AC issuer's certificate
*/
public static X509Certificate createAcIssuerCert(
PublicKey pubKey,
PrivateKey privKey)
throws Exception
{
//
// signers name
//
String issuer = "C=AU, O=The Legion of the Bouncy Castle, OU=Bouncy Primary Certificate";
//
// subjects name - the same as we are self signed.
//
String subject = "C=AU, O=The Legion of the Bouncy Castle, OU=Bouncy Primary Certificate";
//
// create the certificate - version 1
//
v1CertGen.setSerialNumber(BigInteger.valueOf(10));
v1CertGen.setIssuerDN(new X509Principal(issuer));
v1CertGen.setNotBefore(new Date(System.currentTimeMillis() - 1000L * 60 * 60 * 24 * 30));
v1CertGen.setNotAfter(new Date(System.currentTimeMillis() + (1000L * 60 * 60 * 24 * 30)));
v1CertGen.setSubjectDN(new X509Principal(subject));
v1CertGen.setPublicKey(pubKey);
v1CertGen.setSignatureAlgorithm("SHA1WithRSAEncryption");
X509Certificate cert = v1CertGen.generate(privKey);
cert.checkValidity(new Date());
cert.verify(pubKey);
return cert;
}
/**
* we generate a certificate signed by our CA's intermediate certficate
*/
public static X509Certificate createClientCert(
PublicKey pubKey,
PrivateKey caPrivKey,
PublicKey caPubKey)
throws Exception
{
//
// issuer
//
String issuer = "C=AU, O=The Legion of the Bouncy Castle, OU=Bouncy Primary Certificate";
//
// subjects name table.
//
Hashtable attrs = new Hashtable();
Vector order = new Vector();
attrs.put(X509Principal.C, "AU");
attrs.put(X509Principal.O, "The Legion of the Bouncy Castle");
attrs.put(X509Principal.L, "Melbourne");
attrs.put(X509Principal.CN, "Eric H. Echidna");
attrs.put(X509Principal.EmailAddress, "[email protected]");
order.addElement(X509Principal.C);
order.addElement(X509Principal.O);
order.addElement(X509Principal.L);
order.addElement(X509Principal.CN);
order.addElement(X509Principal.EmailAddress);
//
// create the certificate - version 3
//
v3CertGen.reset();
v3CertGen.setSerialNumber(BigInteger.valueOf(20));
v3CertGen.setIssuerDN(new X509Principal(issuer));
v3CertGen.setNotBefore(new Date(System.currentTimeMillis() - 1000L * 60 * 60 * 24 * 30));
v3CertGen.setNotAfter(new Date(System.currentTimeMillis() + (1000L * 60 * 60 * 24 * 30)));
v3CertGen.setSubjectDN(new X509Principal(order, attrs));
v3CertGen.setPublicKey(pubKey);
v3CertGen.setSignatureAlgorithm("SHA1WithRSAEncryption");
//
// add the extensions
//
v3CertGen.addExtension(
MiscObjectIdentifiers.netscapeCertType,
false,
new NetscapeCertType(NetscapeCertType.objectSigning | NetscapeCertType.smime));
X509Certificate cert = v3CertGen.generate(caPrivKey);
cert.checkValidity(new Date());
cert.verify(caPubKey);
return cert;
}
public static void main(String args[])
throws Exception
{
Security.addProvider(new BouncyCastleProvider());
//
// personal keys
//
RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(
new BigInteger("b4a7e46170574f16a97082b22be58b6a2a629798419be12872a4bdba626cfae9900f76abfb12139dce5de56564fab2b6543165a040c606887420e33d91ed7ed7", 16),
new BigInteger("11", 16));
RSAPrivateCrtKeySpec privKeySpec = new RSAPrivateCrtKeySpec(
new BigInteger("b4a7e46170574f16a97082b22be58b6a2a629798419be12872a4bdba626cfae9900f76abfb12139dce5de56564fab2b6543165a040c606887420e33d91ed7ed7", 16),
new BigInteger("11", 16),
new BigInteger("9f66f6b05410cd503b2709e88115d55daced94d1a34d4e32bf824d0dde6028ae79c5f07b580f5dce240d7111f7ddb130a7945cd7d957d1920994da389f490c89", 16),
new BigInteger("c0a0758cdf14256f78d4708c86becdead1b50ad4ad6c5c703e2168fbf37884cb", 16),
new BigInteger("f01734d7960ea60070f1b06f2bb81bfac48ff192ae18451d5e56c734a5aab8a5", 16),
new BigInteger("b54bb9edff22051d9ee60f9351a48591b6500a319429c069a3e335a1d6171391", 16),
new BigInteger("d3d83daf2a0cecd3367ae6f8ae1aeb82e9ac2f816c6fc483533d8297dd7884cd", 16),
new BigInteger("b8f52fc6f38593dabb661d3f50f8897f8106eee68b1bce78a95b132b4e5b5d19", 16));
//
// ca keys
//
RSAPublicKeySpec caPubKeySpec = new RSAPublicKeySpec(
new BigInteger("b259d2d6e627a768c94be36164c2d9fc79d97aab9253140e5bf17751197731d6f7540d2509e7b9ffee0a70a6e26d56e92d2edd7f85aba85600b69089f35f6bdbf3c298e05842535d9f064e6b0391cb7d306e0a2d20c4dfb4e7b49a9640bdea26c10ad69c3f05007ce2513cee44cfe01998e62b6c3637d3fc0391079b26ee36d5", 16),
new BigInteger("11", 16));
RSAPrivateCrtKeySpec caPrivKeySpec = new RSAPrivateCrtKeySpec(
new BigInteger("b259d2d6e627a768c94be36164c2d9fc79d97aab9253140e5bf17751197731d6f7540d2509e7b9ffee0a70a6e26d56e92d2edd7f85aba85600b69089f35f6bdbf3c298e05842535d9f064e6b0391cb7d306e0a2d20c4dfb4e7b49a9640bdea26c10ad69c3f05007ce2513cee44cfe01998e62b6c3637d3fc0391079b26ee36d5", 16),
new BigInteger("11", 16),
new BigInteger("92e08f83cc9920746989ca5034dcb384a094fb9c5a6288fcc4304424ab8f56388f72652d8fafc65a4b9020896f2cde297080f2a540e7b7ce5af0b3446e1258d1dd7f245cf54124b4c6e17da21b90a0ebd22605e6f45c9f136d7a13eaac1c0f7487de8bd6d924972408ebb58af71e76fd7b012a8d0e165f3ae2e5077a8648e619", 16),
new BigInteger("f75e80839b9b9379f1cf1128f321639757dba514642c206bbbd99f9a4846208b3e93fbbe5e0527cc59b1d4b929d9555853004c7c8b30ee6a213c3d1bb7415d03", 16),
new BigInteger("b892d9ebdbfc37e397256dd8a5d3123534d1f03726284743ddc6be3a709edb696fc40c7d902ed804c6eee730eee3d5b20bf6bd8d87a296813c87d3b3cc9d7947", 16),
new BigInteger("1d1a2d3ca8e52068b3094d501c9a842fec37f54db16e9a67070a8b3f53cc03d4257ad252a1a640eadd603724d7bf3737914b544ae332eedf4f34436cac25ceb5", 16),
new BigInteger("6c929e4e81672fef49d9c825163fec97c4b7ba7acb26c0824638ac22605d7201c94625770984f78a56e6e25904fe7db407099cad9b14588841b94f5ab498dded", 16),
new BigInteger("dae7651ee69ad1d081ec5e7188ae126f6004ff39556bde90e0b870962fa7b926d070686d8244fe5a9aa709a95686a104614834b0ada4b10f53197a5cb4c97339", 16));
//
// set up the keys
//
KeyFactory fact = KeyFactory.getInstance("RSA", "BC");
PrivateKey caPrivKey = fact.generatePrivate(caPrivKeySpec);
PublicKey caPubKey = fact.generatePublic(caPubKeySpec);
PrivateKey privKey = fact.generatePrivate(privKeySpec);
PublicKey pubKey = fact.generatePublic(pubKeySpec);
//
// note in this case we are using the CA certificate for both the client cetificate
// and the attribute certificate. This is to make the vcode simpler to read, in practice
// the CA for the attribute certificate should be different to that of the client certificate
//
X509Certificate caCert = createAcIssuerCert(caPubKey, caPrivKey);
X509Certificate clientCert = createClientCert(pubKey, caPrivKey, caPubKey);
// Instantiate a new AC generator
X509V2AttributeCertificateGenerator acGen = new X509V2AttributeCertificateGenerator();
acGen.reset();
//
// Holder: here we use the IssuerSerial form
//
acGen.setHolder(new AttributeCertificateHolder(clientCert));
// set the Issuer
acGen.setIssuer(new AttributeCertificateIssuer(caCert.getSubjectX500Principal()));
//
// serial number (as it's an example we don't have to keep track of the
// serials anyway
//
acGen.setSerialNumber(new BigInteger("1"));
// not Before
acGen.setNotBefore(new Date(System.currentTimeMillis() - 50000));
// not After
acGen.setNotAfter(new Date(System.currentTimeMillis() + 50000));
// signature Algorithmus
acGen.setSignatureAlgorithm("SHA1WithRSAEncryption");
// the actual attributes
GeneralName roleName = new GeneralName(GeneralName.rfc822Name, "DAU123456789");
ASN1EncodableVector roleSyntax = new ASN1EncodableVector();
roleSyntax.add(roleName);
// roleSyntax OID: 2.5.24.72
X509Attribute attributes = new X509Attribute("2.5.24.72",
new DERSequence(roleSyntax));
acGen.addAttribute(attributes);
// finally create the AC
X509V2AttributeCertificate att = (X509V2AttributeCertificate)acGen
.generate(caPrivKey, "BC");
//
// starting here, we parse the newly generated AC
//
// Holder
AttributeCertificateHolder h = att.getHolder();
if (h.match(clientCert))
{
if (h.getEntityNames() != null)
{
System.out.println(h.getEntityNames().length + " entity names found");
}
if (h.getIssuer() != null)
{
System.out.println(h.getIssuer().length + " issuer names found, serial number " + h.getSerialNumber());
}
System.out.println("Matches original client x509 cert");
}
// Issuer
AttributeCertificateIssuer issuer = att.getIssuer();
if (issuer.match(caCert))
{
if (issuer.getPrincipals() != null)
{
System.out.println(issuer.getPrincipals().length + " entity names found");
}
System.out.println("Matches original ca x509 cert");
}
// Dates
System.out.println("valid not before: " + att.getNotBefore());
System.out.println("valid not before: " + att.getNotAfter());
// check the dates, an exception is thrown in checkValidity()...
try
{
att.checkValidity();
att.checkValidity(new Date());
}
catch (Exception e)
{
System.out.println(e);
}
// verify
try
{
att.verify(caPubKey, "BC");
}
catch (Exception e)
{
System.out.println(e);
}
// Attribute
X509Attribute[] attribs = att.getAttributes();
System.out.println("cert has " + attribs.length + " attributes:");
for (int i = 0; i < attribs.length; i++)
{
X509Attribute a = attribs[i];
System.out.println("OID: " + a.getOID());
// currently we only check for the presence of a 'RoleSyntax' attribute
if (a.getOID().equals("2.5.24.72"))
{
System.out.println("rolesyntax read from cert!");
}
}
}
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