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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 1.5 and up.
package org.bouncycastle.crypto.util;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.cryptopro.ECGOST3410NamedCurves;
import org.bouncycastle.asn1.cryptopro.GOST3410PublicKeyAlgParameters;
import org.bouncycastle.asn1.edec.EdECObjectIdentifiers;
import org.bouncycastle.asn1.oiw.ElGamalParameter;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.DHParameter;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.pkcs.RSAPrivateKey;
import org.bouncycastle.asn1.rosstandart.RosstandartObjectIdentifiers;
import org.bouncycastle.asn1.sec.ECPrivateKey;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.DSAParameter;
import org.bouncycastle.asn1.x509.X509ObjectIdentifiers;
import org.bouncycastle.asn1.x9.ECNamedCurveTable;
import org.bouncycastle.asn1.x9.X962Parameters;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.crypto.ec.CustomNamedCurves;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.DHParameters;
import org.bouncycastle.crypto.params.DHPrivateKeyParameters;
import org.bouncycastle.crypto.params.DSAParameters;
import org.bouncycastle.crypto.params.DSAPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECGOST3410Parameters;
import org.bouncycastle.crypto.params.ECNamedDomainParameters;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.Ed25519PrivateKeyParameters;
import org.bouncycastle.crypto.params.Ed448PrivateKeyParameters;
import org.bouncycastle.crypto.params.ElGamalParameters;
import org.bouncycastle.crypto.params.ElGamalPrivateKeyParameters;
import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters;
import org.bouncycastle.crypto.params.X25519PrivateKeyParameters;
import org.bouncycastle.crypto.params.X448PrivateKeyParameters;
import org.bouncycastle.util.Arrays;
/**
* 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(ASN1Primitive.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.getPrivateKeyAlgorithm();
ASN1ObjectIdentifier algOID = algId.getAlgorithm();
if (algOID.equals(PKCSObjectIdentifiers.rsaEncryption)
|| algOID.equals(PKCSObjectIdentifiers.id_RSASSA_PSS)
|| algOID.equals(X509ObjectIdentifiers.id_ea_rsa))
{
RSAPrivateKey keyStructure = RSAPrivateKey.getInstance(keyInfo.parsePrivateKey());
return new RSAPrivateCrtKeyParameters(keyStructure.getModulus(),
keyStructure.getPublicExponent(), keyStructure.getPrivateExponent(),
keyStructure.getPrime1(), keyStructure.getPrime2(), keyStructure.getExponent1(),
keyStructure.getExponent2(), keyStructure.getCoefficient());
}
// TODO?
// else if (algOID.equals(X9ObjectIdentifiers.dhpublicnumber))
else if (algOID.equals(PKCSObjectIdentifiers.dhKeyAgreement))
{
DHParameter params = DHParameter.getInstance(algId.getParameters());
ASN1Integer derX = (ASN1Integer)keyInfo.parsePrivateKey();
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 (algOID.equals(OIWObjectIdentifiers.elGamalAlgorithm))
{
ElGamalParameter params = ElGamalParameter.getInstance(algId.getParameters());
ASN1Integer derX = (ASN1Integer)keyInfo.parsePrivateKey();
return new ElGamalPrivateKeyParameters(derX.getValue(), new ElGamalParameters(
params.getP(), params.getG()));
}
else if (algOID.equals(X9ObjectIdentifiers.id_dsa))
{
ASN1Integer derX = (ASN1Integer)keyInfo.parsePrivateKey();
ASN1Encodable de = algId.getParameters();
DSAParameters parameters = null;
if (de != null)
{
DSAParameter params = DSAParameter.getInstance(de.toASN1Primitive());
parameters = new DSAParameters(params.getP(), params.getQ(), params.getG());
}
return new DSAPrivateKeyParameters(derX.getValue(), parameters);
}
else if (algOID.equals(X9ObjectIdentifiers.id_ecPublicKey))
{
X962Parameters params = X962Parameters.getInstance(algId.getParameters());
X9ECParameters x9;
ECDomainParameters dParams;
if (params.isNamedCurve())
{
ASN1ObjectIdentifier oid = (ASN1ObjectIdentifier)params.getParameters();
x9 = CustomNamedCurves.getByOID(oid);
if (x9 == null)
{
x9 = ECNamedCurveTable.getByOID(oid);
}
dParams = new ECNamedDomainParameters(oid, x9);
}
else
{
x9 = X9ECParameters.getInstance(params.getParameters());
dParams = new ECDomainParameters(
x9.getCurve(), x9.getG(), x9.getN(), x9.getH(), x9.getSeed());
}
ECPrivateKey ec = ECPrivateKey.getInstance(keyInfo.parsePrivateKey());
BigInteger d = ec.getKey();
return new ECPrivateKeyParameters(d, dParams);
}
else if (algOID.equals(EdECObjectIdentifiers.id_X25519))
{
return new X25519PrivateKeyParameters(getRawKey(keyInfo, X25519PrivateKeyParameters.KEY_SIZE), 0);
}
else if (algOID.equals(EdECObjectIdentifiers.id_X448))
{
return new X448PrivateKeyParameters(getRawKey(keyInfo, X448PrivateKeyParameters.KEY_SIZE), 0);
}
else if (algOID.equals(EdECObjectIdentifiers.id_Ed25519))
{
return new Ed25519PrivateKeyParameters(getRawKey(keyInfo, Ed25519PrivateKeyParameters.KEY_SIZE), 0);
}
else if (algOID.equals(EdECObjectIdentifiers.id_Ed448))
{
return new Ed448PrivateKeyParameters(getRawKey(keyInfo, Ed448PrivateKeyParameters.KEY_SIZE), 0);
}
else if (
algOID.equals(CryptoProObjectIdentifiers.gostR3410_2001) ||
algOID.equals(RosstandartObjectIdentifiers.id_tc26_gost_3410_12_512) ||
algOID.equals(RosstandartObjectIdentifiers.id_tc26_gost_3410_12_256))
{
GOST3410PublicKeyAlgParameters gostParams = GOST3410PublicKeyAlgParameters.getInstance(keyInfo.getPrivateKeyAlgorithm().getParameters());
ECGOST3410Parameters ecSpec = null;
BigInteger d = null;
ASN1Primitive p = keyInfo.getPrivateKeyAlgorithm().getParameters().toASN1Primitive();
if (p instanceof ASN1Sequence && (ASN1Sequence.getInstance(p).size() == 2 || ASN1Sequence.getInstance(p).size() == 3))
{
X9ECParameters ecP = ECGOST3410NamedCurves.getByOIDX9(gostParams.getPublicKeyParamSet());
ecSpec = new ECGOST3410Parameters(
new ECNamedDomainParameters(
gostParams.getPublicKeyParamSet(), ecP),
gostParams.getPublicKeyParamSet(),
gostParams.getDigestParamSet(),
gostParams.getEncryptionParamSet());
ASN1OctetString privEnc = keyInfo.getPrivateKey();
if (privEnc.getOctets().length == 32 || privEnc.getOctets().length == 64)
{
d = new BigInteger(1, Arrays.reverse(privEnc.getOctets()));
}
else
{
ASN1Encodable privKey = keyInfo.parsePrivateKey();
if (privKey instanceof ASN1Integer)
{
d = ASN1Integer.getInstance(privKey).getPositiveValue();
}
else
{
byte[] dVal = Arrays.reverse(ASN1OctetString.getInstance(privKey).getOctets());
d = new BigInteger(1, dVal);
}
}
}
else
{
X962Parameters params = X962Parameters.getInstance(keyInfo.getPrivateKeyAlgorithm().getParameters());
if (params.isNamedCurve())
{
ASN1ObjectIdentifier oid = ASN1ObjectIdentifier.getInstance(params.getParameters());
X9ECParameters ecP = ECNamedCurveTable.getByOID(oid);
ecSpec = new ECGOST3410Parameters(new ECNamedDomainParameters(oid, ecP),
gostParams.getPublicKeyParamSet(), gostParams.getDigestParamSet(),
gostParams.getEncryptionParamSet());
}
else if (params.isImplicitlyCA())
{
ecSpec = null;
}
else
{
X9ECParameters ecP = X9ECParameters.getInstance(params.getParameters());
ecSpec = new ECGOST3410Parameters(new ECNamedDomainParameters(algOID, ecP),
gostParams.getPublicKeyParamSet(), gostParams.getDigestParamSet(),
gostParams.getEncryptionParamSet());
}
ASN1Encodable privKey = keyInfo.parsePrivateKey();
if (privKey instanceof ASN1Integer)
{
ASN1Integer derD = ASN1Integer.getInstance(privKey);
d = derD.getValue();
}
else
{
ECPrivateKey ec = ECPrivateKey.getInstance(privKey);
d = ec.getKey();
}
}
return new ECPrivateKeyParameters(
d,
new ECGOST3410Parameters(
ecSpec,
gostParams.getPublicKeyParamSet(),
gostParams.getDigestParamSet(),
gostParams.getEncryptionParamSet()));
}
else
{
throw new RuntimeException("algorithm identifier in private key not recognised");
}
}
private static byte[] getRawKey(PrivateKeyInfo keyInfo, int expectedSize)
throws IOException
{
byte[] result = ASN1OctetString.getInstance(keyInfo.parsePrivateKey()).getOctets();
if (expectedSize != result.length)
{
throw new RuntimeException("private key encoding has incorrect length");
}
return result;
}
}