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This OSGi bundle wraps ${pkgArtifactId} ${pkgVersion} jar file.
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.ASN1OctetString;
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.RSAPublicKey;
import org.bouncycastle.asn1.rosstandart.RosstandartObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.DSAParameter;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
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.DSAPublicKeyParameters;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECGOST3410Parameters;
import org.bouncycastle.crypto.params.ECNamedDomainParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.params.Ed25519PublicKeyParameters;
import org.bouncycastle.crypto.params.Ed448PublicKeyParameters;
import org.bouncycastle.crypto.params.RSAKeyParameters;
import org.bouncycastle.crypto.params.X25519PublicKeyParameters;
import org.bouncycastle.crypto.params.X448PublicKeyParameters;
/**
* Factory to create ASN.1 subject public key info objects from lightweight public keys.
*/
public class SubjectPublicKeyInfoFactory
{
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 SubjectPublicKeyInfoFactory()
{
}
/**
* Create a SubjectPublicKeyInfo public key.
*
* @param publicKey the key to be encoded into the info object.
* @return a SubjectPublicKeyInfo representing the key.
* @throws java.io.IOException on an error encoding the key
*/
public static SubjectPublicKeyInfo createSubjectPublicKeyInfo(AsymmetricKeyParameter publicKey)
throws IOException
{
if (publicKey instanceof RSAKeyParameters)
{
RSAKeyParameters pub = (RSAKeyParameters)publicKey;
return new SubjectPublicKeyInfo(new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, DERNull.INSTANCE), new RSAPublicKey(pub.getModulus(), pub.getExponent()));
}
else if (publicKey instanceof DSAPublicKeyParameters)
{
DSAPublicKeyParameters pub = (DSAPublicKeyParameters)publicKey;
DSAParameter params = null;
DSAParameters dsaParams = pub.getParameters();
if (dsaParams != null)
{
params = new DSAParameter(dsaParams.getP(), dsaParams.getQ(), dsaParams.getG());
}
return new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa, params), new ASN1Integer(pub.getY()));
}
else if (publicKey instanceof ECPublicKeyParameters)
{
ECPublicKeyParameters pub = (ECPublicKeyParameters)publicKey;
ECDomainParameters domainParams = pub.getParameters();
ASN1Encodable params;
if (domainParams == null)
{
params = new X962Parameters(DERNull.INSTANCE); // Implicitly CA
}
else if (domainParams instanceof ECGOST3410Parameters)
{
ECGOST3410Parameters gostParams = (ECGOST3410Parameters)domainParams;
BigInteger bX = pub.getQ().getAffineXCoord().toBigInteger();
BigInteger bY = pub.getQ().getAffineYCoord().toBigInteger();
params = new GOST3410PublicKeyAlgParameters(gostParams.getPublicKeyParamSet(), gostParams.getDigestParamSet());
int encKeySize;
int offset;
ASN1ObjectIdentifier algIdentifier;
if (cryptoProOids.contains(gostParams.getPublicKeyParamSet()))
{
encKeySize = 64;
offset = 32;
algIdentifier = CryptoProObjectIdentifiers.gostR3410_2001;
}
else
{
boolean is512 = (bX.bitLength() > 256);
if (is512)
{
encKeySize = 128;
offset = 64;
algIdentifier = RosstandartObjectIdentifiers.id_tc26_gost_3410_12_512;
}
else
{
encKeySize = 64;
offset = 32;
algIdentifier = RosstandartObjectIdentifiers.id_tc26_gost_3410_12_256;
}
}
byte[] encKey = new byte[encKeySize];
extractBytes(encKey, encKeySize / 2, 0, bX);
extractBytes(encKey, encKeySize / 2, offset, bY);
try
{
return new SubjectPublicKeyInfo(new AlgorithmIdentifier(algIdentifier, params), new DEROctetString(encKey));
}
catch (IOException e)
{
return null;
}
}
else if (domainParams instanceof ECNamedDomainParameters)
{
params = new X962Parameters(((ECNamedDomainParameters)domainParams).getName());
}
else
{
X9ECParameters ecP = new X9ECParameters(
domainParams.getCurve(),
// TODO Support point compression
new X9ECPoint(domainParams.getG(), false),
domainParams.getN(),
domainParams.getH(),
domainParams.getSeed());
params = new X962Parameters(ecP);
}
// TODO Support point compression
byte[] pubKeyOctets = pub.getQ().getEncoded(false);
return new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, params), pubKeyOctets);
}
else if (publicKey instanceof X448PublicKeyParameters)
{
X448PublicKeyParameters key = (X448PublicKeyParameters)publicKey;
return new SubjectPublicKeyInfo(new AlgorithmIdentifier(EdECObjectIdentifiers.id_X448), key.getEncoded());
}
else if (publicKey instanceof X25519PublicKeyParameters)
{
X25519PublicKeyParameters key = (X25519PublicKeyParameters)publicKey;
return new SubjectPublicKeyInfo(new AlgorithmIdentifier(EdECObjectIdentifiers.id_X25519), key.getEncoded());
}
else if (publicKey instanceof Ed448PublicKeyParameters)
{
Ed448PublicKeyParameters key = (Ed448PublicKeyParameters)publicKey;
return new SubjectPublicKeyInfo(new AlgorithmIdentifier(EdECObjectIdentifiers.id_Ed448), key.getEncoded());
}
else if (publicKey instanceof Ed25519PublicKeyParameters)
{
Ed25519PublicKeyParameters key = (Ed25519PublicKeyParameters)publicKey;
return new SubjectPublicKeyInfo(new AlgorithmIdentifier(EdECObjectIdentifiers.id_Ed25519), key.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];
}
}
}