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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms.
This jar contains JCE provider for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.7.
The newest version!
package org.spongycastle.jce.netscape;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.SignatureException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.X509EncodedKeySpec;
import org.spongycastle.asn1.ASN1EncodableVector;
import org.spongycastle.asn1.ASN1Encoding;
import org.spongycastle.asn1.ASN1InputStream;
import org.spongycastle.asn1.ASN1Object;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.DERBitString;
import org.spongycastle.asn1.DERIA5String;
import org.spongycastle.asn1.DERSequence;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.asn1.x509.SubjectPublicKeyInfo;
/**
*
*
* Handles NetScape certificate request (KEYGEN), these are constructed as:
*
* SignedPublicKeyAndChallenge ::= SEQUENCE {
* publicKeyAndChallenge PublicKeyAndChallenge,
* signatureAlgorithm AlgorithmIdentifier,
* signature BIT STRING
* }
*
*
* PublicKey's encoded-format has to be X.509.
*
**/
public class NetscapeCertRequest
extends ASN1Object
{
AlgorithmIdentifier sigAlg;
AlgorithmIdentifier keyAlg;
byte sigBits [];
String challenge;
DERBitString content;
PublicKey pubkey ;
private static ASN1Sequence getReq(
byte[] r)
throws IOException
{
ASN1InputStream aIn = new ASN1InputStream(new ByteArrayInputStream(r));
return ASN1Sequence.getInstance(aIn.readObject());
}
public NetscapeCertRequest(
byte[] req)
throws IOException
{
this(getReq(req));
}
public NetscapeCertRequest (ASN1Sequence spkac)
{
try
{
//
// SignedPublicKeyAndChallenge ::= SEQUENCE {
// publicKeyAndChallenge PublicKeyAndChallenge,
// signatureAlgorithm AlgorithmIdentifier,
// signature BIT STRING
// }
//
if (spkac.size() != 3)
{
throw new IllegalArgumentException("invalid SPKAC (size):"
+ spkac.size());
}
sigAlg = new AlgorithmIdentifier((ASN1Sequence)spkac
.getObjectAt(1));
sigBits = ((DERBitString)spkac.getObjectAt(2)).getBytes();
//
// PublicKeyAndChallenge ::= SEQUENCE {
// spki SubjectPublicKeyInfo,
// challenge IA5STRING
// }
//
ASN1Sequence pkac = (ASN1Sequence)spkac.getObjectAt(0);
if (pkac.size() != 2)
{
throw new IllegalArgumentException("invalid PKAC (len): "
+ pkac.size());
}
challenge = ((DERIA5String)pkac.getObjectAt(1)).getString();
//this could be dangerous, as ASN.1 decoding/encoding
//could potentially alter the bytes
content = new DERBitString(pkac);
SubjectPublicKeyInfo pubkeyinfo = new SubjectPublicKeyInfo(
(ASN1Sequence)pkac.getObjectAt(0));
X509EncodedKeySpec xspec = new X509EncodedKeySpec(new DERBitString(
pubkeyinfo).getBytes());
keyAlg = pubkeyinfo.getAlgorithmId();
pubkey = KeyFactory.getInstance(keyAlg.getObjectId().getId(), "SC")
.generatePublic(xspec);
}
catch (Exception e)
{
throw new IllegalArgumentException(e.toString());
}
}
public NetscapeCertRequest(
String challenge,
AlgorithmIdentifier signing_alg,
PublicKey pub_key) throws NoSuchAlgorithmException,
InvalidKeySpecException, NoSuchProviderException
{
this.challenge = challenge;
sigAlg = signing_alg;
pubkey = pub_key;
ASN1EncodableVector content_der = new ASN1EncodableVector();
content_der.add(getKeySpec());
//content_der.add(new SubjectPublicKeyInfo(sigAlg, new RSAPublicKeyStructure(pubkey.getModulus(), pubkey.getPublicExponent()).getDERObject()));
content_der.add(new DERIA5String(challenge));
content = new DERBitString(new DERSequence(content_der));
}
public String getChallenge()
{
return challenge;
}
public void setChallenge(String value)
{
challenge = value;
}
public AlgorithmIdentifier getSigningAlgorithm()
{
return sigAlg;
}
public void setSigningAlgorithm(AlgorithmIdentifier value)
{
sigAlg = value;
}
public AlgorithmIdentifier getKeyAlgorithm()
{
return keyAlg;
}
public void setKeyAlgorithm(AlgorithmIdentifier value)
{
keyAlg = value;
}
public PublicKey getPublicKey()
{
return pubkey;
}
public void setPublicKey(PublicKey value)
{
pubkey = value;
}
public boolean verify(String challenge) throws NoSuchAlgorithmException,
InvalidKeyException, SignatureException, NoSuchProviderException
{
if (!challenge.equals(this.challenge))
{
return false;
}
//
// Verify the signature .. shows the response was generated
// by someone who knew the associated private key
//
Signature sig = Signature.getInstance(sigAlg.getObjectId().getId(),
"SC");
sig.initVerify(pubkey);
sig.update(content.getBytes());
return sig.verify(sigBits);
}
public void sign(PrivateKey priv_key) throws NoSuchAlgorithmException,
InvalidKeyException, SignatureException, NoSuchProviderException,
InvalidKeySpecException
{
sign(priv_key, null);
}
public void sign(PrivateKey priv_key, SecureRandom rand)
throws NoSuchAlgorithmException, InvalidKeyException,
SignatureException, NoSuchProviderException,
InvalidKeySpecException
{
Signature sig = Signature.getInstance(sigAlg.getAlgorithm().getId(),
"SC");
if (rand != null)
{
sig.initSign(priv_key, rand);
}
else
{
sig.initSign(priv_key);
}
ASN1EncodableVector pkac = new ASN1EncodableVector();
pkac.add(getKeySpec());
pkac.add(new DERIA5String(challenge));
try
{
sig.update(new DERSequence(pkac).getEncoded(ASN1Encoding.DER));
}
catch (IOException ioe)
{
throw new SignatureException(ioe.getMessage());
}
sigBits = sig.sign();
}
private ASN1Primitive getKeySpec() throws NoSuchAlgorithmException,
InvalidKeySpecException, NoSuchProviderException
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ASN1Primitive obj = null;
try
{
baos.write(pubkey.getEncoded());
baos.close();
ASN1InputStream derin = new ASN1InputStream(
new ByteArrayInputStream(baos.toByteArray()));
obj = derin.readObject();
}
catch (IOException ioe)
{
throw new InvalidKeySpecException(ioe.getMessage());
}
return obj;
}
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector spkac = new ASN1EncodableVector();
ASN1EncodableVector pkac = new ASN1EncodableVector();
try
{
pkac.add(getKeySpec());
}
catch (Exception e)
{
//ignore
}
pkac.add(new DERIA5String(challenge));
spkac.add(new DERSequence(pkac));
spkac.add(sigAlg);
spkac.add(new DERBitString(sigBits));
return new DERSequence(spkac);
}
}