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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.math.BigInteger;
import java.util.HashSet;
import java.util.Set;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.cryptopro.GOST3410PublicKeyAlgParameters;
import org.bouncycastle.asn1.edec.EdECObjectIdentifiers;
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.x9.X962Parameters;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.asn1.x9.X9ECPoint;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
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.RSAKeyParameters;
import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters;
import org.bouncycastle.crypto.params.X25519PrivateKeyParameters;
import org.bouncycastle.crypto.params.X448PrivateKeyParameters;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.math.ec.FixedPointCombMultiplier;
/**
* Factory to create ASN.1 private key info objects from lightweight private keys.
*/
public class PrivateKeyInfoFactory
{
private static Set cryptoProOids = new HashSet(5);
static
{
cryptoProOids.add(CryptoProObjectIdentifiers.gostR3410_2001_CryptoPro_A);
cryptoProOids.add(CryptoProObjectIdentifiers.gostR3410_2001_CryptoPro_B);
cryptoProOids.add(CryptoProObjectIdentifiers.gostR3410_2001_CryptoPro_C);
cryptoProOids.add(CryptoProObjectIdentifiers.gostR3410_2001_CryptoPro_XchA);
cryptoProOids.add(CryptoProObjectIdentifiers.gostR3410_2001_CryptoPro_XchB);
}
private PrivateKeyInfoFactory()
{
}
/**
* Create a PrivateKeyInfo representation of a private key.
*
* @param privateKey the key to be encoded into the info object.
* @return the appropriate PrivateKeyInfo
* @throws java.io.IOException on an error encoding the key
*/
public static PrivateKeyInfo createPrivateKeyInfo(AsymmetricKeyParameter privateKey)
throws IOException
{
return createPrivateKeyInfo(privateKey, null);
}
/**
* Create a PrivateKeyInfo representation of a private key with attributes.
*
* @param privateKey the key to be encoded into the info object.
* @param attributes the set of attributes to be included.
* @return the appropriate PrivateKeyInfo
* @throws java.io.IOException on an error encoding the key
*/
public static PrivateKeyInfo createPrivateKeyInfo(AsymmetricKeyParameter privateKey, ASN1Set attributes)
throws IOException
{
if (privateKey instanceof RSAKeyParameters)
{
RSAPrivateCrtKeyParameters priv = (RSAPrivateCrtKeyParameters)privateKey;
return new PrivateKeyInfo(new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, DERNull.INSTANCE),
new RSAPrivateKey(priv.getModulus(), priv.getPublicExponent(), priv.getExponent(), priv.getP(), priv.getQ(), priv.getDP(), priv.getDQ(), priv.getQInv()),
attributes);
}
else if (privateKey instanceof DSAPrivateKeyParameters)
{
DSAPrivateKeyParameters priv = (DSAPrivateKeyParameters)privateKey;
DSAParameters params = priv.getParameters();
return new PrivateKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa,
new DSAParameter(params.getP(), params.getQ(), params.getG())), new ASN1Integer(priv.getX()),
attributes);
}
else if (privateKey instanceof ECPrivateKeyParameters)
{
ECPrivateKeyParameters priv = (ECPrivateKeyParameters)privateKey;
ECDomainParameters domainParams = priv.getParameters();
ASN1Encodable params;
int orderBitLength;
if (domainParams == null)
{
params = new X962Parameters(DERNull.INSTANCE); // Implicitly CA
orderBitLength = priv.getD().bitLength(); // TODO: this is as good as currently available, must be a better way...
}
else if (domainParams instanceof ECGOST3410Parameters)
{
GOST3410PublicKeyAlgParameters gostParams = new GOST3410PublicKeyAlgParameters(
((ECGOST3410Parameters)domainParams).getPublicKeyParamSet(),
((ECGOST3410Parameters)domainParams).getDigestParamSet(),
((ECGOST3410Parameters)domainParams).getEncryptionParamSet());
int size;
ASN1ObjectIdentifier identifier;
if (cryptoProOids.contains(gostParams.getPublicKeyParamSet()))
{
size = 32;
identifier = CryptoProObjectIdentifiers.gostR3410_2001;
}
else
{
boolean is512 = priv.getD().bitLength() > 256;
identifier = (is512) ?
RosstandartObjectIdentifiers.id_tc26_gost_3410_12_512 :
RosstandartObjectIdentifiers.id_tc26_gost_3410_12_256;
size = (is512) ? 64 : 32;
}
byte[] encKey = new byte[size];
extractBytes(encKey, size, 0, priv.getD());
return new PrivateKeyInfo(new AlgorithmIdentifier(identifier, gostParams), new DEROctetString(encKey));
}
else if (domainParams instanceof ECNamedDomainParameters)
{
params = new X962Parameters(((ECNamedDomainParameters)domainParams).getName());
orderBitLength = domainParams.getN().bitLength();
}
else
{
X9ECParameters ecP = new X9ECParameters(
domainParams.getCurve(),
new X9ECPoint(domainParams.getG(), false),
domainParams.getN(),
domainParams.getH(),
domainParams.getSeed());
params = new X962Parameters(ecP);
orderBitLength = domainParams.getN().bitLength();
}
ECPoint q = new FixedPointCombMultiplier().multiply(domainParams.getG(), priv.getD());
// TODO Support point compression
DERBitString publicKey = new DERBitString(q.getEncoded(false));
return new PrivateKeyInfo(
new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, params),
new ECPrivateKey(orderBitLength, priv.getD(), publicKey, params),
attributes);
}
else if (privateKey instanceof X448PrivateKeyParameters)
{
X448PrivateKeyParameters key = (X448PrivateKeyParameters)privateKey;
return new PrivateKeyInfo(new AlgorithmIdentifier(EdECObjectIdentifiers.id_X448),
new DEROctetString(key.getEncoded()), attributes, key.generatePublicKey().getEncoded());
}
else if (privateKey instanceof X25519PrivateKeyParameters)
{
X25519PrivateKeyParameters key = (X25519PrivateKeyParameters)privateKey;
return new PrivateKeyInfo(new AlgorithmIdentifier(EdECObjectIdentifiers.id_X25519),
new DEROctetString(key.getEncoded()), attributes, key.generatePublicKey().getEncoded());
}
else if (privateKey instanceof Ed448PrivateKeyParameters)
{
Ed448PrivateKeyParameters key = (Ed448PrivateKeyParameters)privateKey;
return new PrivateKeyInfo(new AlgorithmIdentifier(EdECObjectIdentifiers.id_Ed448),
new DEROctetString(key.getEncoded()), attributes, key.generatePublicKey().getEncoded());
}
else if (privateKey instanceof Ed25519PrivateKeyParameters)
{
Ed25519PrivateKeyParameters key = (Ed25519PrivateKeyParameters)privateKey;
return new PrivateKeyInfo(new AlgorithmIdentifier(EdECObjectIdentifiers.id_Ed25519),
new DEROctetString(key.getEncoded()), attributes, key.generatePublicKey().getEncoded());
}
else
{
throw new IOException("key parameters not recognized");
}
}
private static void extractBytes(byte[] encKey, int size, int offSet, BigInteger bI)
{
byte[] val = bI.toByteArray();
if (val.length < size)
{
byte[] tmp = new byte[size];
System.arraycopy(val, 0, tmp, tmp.length - val.length, val.length);
val = tmp;
}
for (int i = 0; i != size; i++)
{
encKey[offSet + i] = val[val.length - 1 - i];
}
}
}
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