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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android.
Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add
an alternative (updated/complete) Bouncy Castle jar.
This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.
package org.spongycastle.crypto.util;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import org.spongycastle.asn1.ASN1InputStream;
import org.spongycastle.asn1.ASN1Object;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.DEREncodable;
import org.spongycastle.asn1.DERInteger;
import org.spongycastle.asn1.DERObject;
import org.spongycastle.asn1.DERObjectIdentifier;
import org.spongycastle.asn1.nist.NISTNamedCurves;
import org.spongycastle.asn1.oiw.ElGamalParameter;
import org.spongycastle.asn1.oiw.OIWObjectIdentifiers;
import org.spongycastle.asn1.pkcs.DHParameter;
import org.spongycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.spongycastle.asn1.pkcs.PrivateKeyInfo;
import org.spongycastle.asn1.pkcs.RSAPrivateKeyStructure;
import org.spongycastle.asn1.sec.ECPrivateKeyStructure;
import org.spongycastle.asn1.sec.SECNamedCurves;
import org.spongycastle.asn1.teletrust.TeleTrusTNamedCurves;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.asn1.x509.DSAParameter;
import org.spongycastle.asn1.x9.X962NamedCurves;
import org.spongycastle.asn1.x9.X962Parameters;
import org.spongycastle.asn1.x9.X9ECParameters;
import org.spongycastle.asn1.x9.X9ObjectIdentifiers;
import org.spongycastle.crypto.params.AsymmetricKeyParameter;
import org.spongycastle.crypto.params.DHParameters;
import org.spongycastle.crypto.params.DHPrivateKeyParameters;
import org.spongycastle.crypto.params.DSAParameters;
import org.spongycastle.crypto.params.DSAPrivateKeyParameters;
import org.spongycastle.crypto.params.ECDomainParameters;
import org.spongycastle.crypto.params.ECPrivateKeyParameters;
import org.spongycastle.crypto.params.ElGamalParameters;
import org.spongycastle.crypto.params.ElGamalPrivateKeyParameters;
import org.spongycastle.crypto.params.RSAPrivateCrtKeyParameters;
/**
* Factory for creating private key objects from PKCS8 PrivateKeyInfo objects.
*/
public class PrivateKeyFactory
{
/**
* Create a private key parameter from a PKCS8 PrivateKeyInfo encoding.
*
* @param privateKeyInfoData the PrivateKeyInfo encoding
* @return a suitable private key parameter
* @throws IOException on an error decoding the key
*/
public static AsymmetricKeyParameter createKey(byte[] privateKeyInfoData) throws IOException
{
return createKey(PrivateKeyInfo.getInstance(ASN1Object.fromByteArray(privateKeyInfoData)));
}
/**
* Create a private key parameter from a PKCS8 PrivateKeyInfo encoding read from a
* stream.
*
* @param inStr the stream to read the PrivateKeyInfo encoding from
* @return a suitable private key parameter
* @throws IOException on an error decoding the key
*/
public static AsymmetricKeyParameter createKey(InputStream inStr) throws IOException
{
return createKey(PrivateKeyInfo.getInstance(new ASN1InputStream(inStr).readObject()));
}
/**
* Create a private key parameter from the passed in PKCS8 PrivateKeyInfo object.
*
* @param keyInfo the PrivateKeyInfo object containing the key material
* @return a suitable private key parameter
* @throws IOException on an error decoding the key
*/
public static AsymmetricKeyParameter createKey(PrivateKeyInfo keyInfo) throws IOException
{
AlgorithmIdentifier algId = keyInfo.getAlgorithmId();
if (algId.getAlgorithm().equals(PKCSObjectIdentifiers.rsaEncryption))
{
RSAPrivateKeyStructure keyStructure = new RSAPrivateKeyStructure(
(ASN1Sequence)keyInfo.getPrivateKey());
return new RSAPrivateCrtKeyParameters(keyStructure.getModulus(),
keyStructure.getPublicExponent(), keyStructure.getPrivateExponent(),
keyStructure.getPrime1(), keyStructure.getPrime2(), keyStructure.getExponent1(),
keyStructure.getExponent2(), keyStructure.getCoefficient());
}
// TODO?
// else if (algId.getObjectId().equals(X9ObjectIdentifiers.dhpublicnumber))
else if (algId.getObjectId().equals(PKCSObjectIdentifiers.dhKeyAgreement))
{
DHParameter params = new DHParameter(
(ASN1Sequence)keyInfo.getAlgorithmId().getParameters());
DERInteger derX = (DERInteger)keyInfo.getPrivateKey();
BigInteger lVal = params.getL();
int l = lVal == null ? 0 : lVal.intValue();
DHParameters dhParams = new DHParameters(params.getP(), params.getG(), null, l);
return new DHPrivateKeyParameters(derX.getValue(), dhParams);
}
else if (algId.getObjectId().equals(OIWObjectIdentifiers.elGamalAlgorithm))
{
ElGamalParameter params = new ElGamalParameter(
(ASN1Sequence)keyInfo.getAlgorithmId().getParameters());
DERInteger derX = (DERInteger)keyInfo.getPrivateKey();
return new ElGamalPrivateKeyParameters(derX.getValue(), new ElGamalParameters(
params.getP(), params.getG()));
}
else if (algId.getObjectId().equals(X9ObjectIdentifiers.id_dsa))
{
DERInteger derX = (DERInteger)keyInfo.getPrivateKey();
DEREncodable de = keyInfo.getAlgorithmId().getParameters();
DSAParameters parameters = null;
if (de != null)
{
DSAParameter params = DSAParameter.getInstance(de.getDERObject());
parameters = new DSAParameters(params.getP(), params.getQ(), params.getG());
}
return new DSAPrivateKeyParameters(derX.getValue(), parameters);
}
else if (algId.getObjectId().equals(X9ObjectIdentifiers.id_ecPublicKey))
{
X962Parameters params = new X962Parameters(
(DERObject)keyInfo.getAlgorithmId().getParameters());
ECDomainParameters dParams = null;
if (params.isNamedCurve())
{
DERObjectIdentifier oid = (DERObjectIdentifier)params.getParameters();
X9ECParameters ecP = X962NamedCurves.getByOID(oid);
if (ecP == null)
{
ecP = SECNamedCurves.getByOID(oid);
if (ecP == null)
{
ecP = NISTNamedCurves.getByOID(oid);
if (ecP == null)
{
ecP = TeleTrusTNamedCurves.getByOID(oid);
}
}
}
dParams = new ECDomainParameters(ecP.getCurve(), ecP.getG(), ecP.getN(),
ecP.getH(), ecP.getSeed());
}
else
{
X9ECParameters ecP = new X9ECParameters((ASN1Sequence)params.getParameters());
dParams = new ECDomainParameters(ecP.getCurve(), ecP.getG(), ecP.getN(),
ecP.getH(), ecP.getSeed());
}
ECPrivateKeyStructure ec = new ECPrivateKeyStructure(
(ASN1Sequence)keyInfo.getPrivateKey());
return new ECPrivateKeyParameters(ec.getKey(), dParams);
}
else
{
throw new RuntimeException("algorithm identifier in key not recognised");
}
}
}