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This OSGi bundle wraps ${pkgArtifactId} ${pkgVersion} jar file.
package org.bouncycastle.pqc.crypto.util;
import java.io.IOException;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.pqc.asn1.PQCObjectIdentifiers;
import org.bouncycastle.pqc.asn1.SPHINCS256KeyParams;
import org.bouncycastle.pqc.asn1.XMSSKeyParams;
import org.bouncycastle.pqc.asn1.XMSSMTKeyParams;
import org.bouncycastle.pqc.asn1.XMSSMTPrivateKey;
import org.bouncycastle.pqc.asn1.XMSSPrivateKey;
import org.bouncycastle.pqc.crypto.lms.Composer;
import org.bouncycastle.pqc.crypto.lms.HSSPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.lms.LMSPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.newhope.NHPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.qtesla.QTESLAPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.sphincs.SPHINCSPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.xmss.BDS;
import org.bouncycastle.pqc.crypto.xmss.BDSStateMap;
import org.bouncycastle.pqc.crypto.xmss.XMSSMTPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.xmss.XMSSPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.xmss.XMSSUtil;
import org.bouncycastle.util.Pack;
/**
* Factory to create ASN.1 private key info objects from lightweight private keys.
*/
public class PrivateKeyInfoFactory
{
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 QTESLAPrivateKeyParameters)
{
QTESLAPrivateKeyParameters keyParams = (QTESLAPrivateKeyParameters)privateKey;
AlgorithmIdentifier algorithmIdentifier = Utils.qTeslaLookupAlgID(keyParams.getSecurityCategory());
return new PrivateKeyInfo(algorithmIdentifier, new DEROctetString(keyParams.getSecret()), attributes);
}
else if (privateKey instanceof SPHINCSPrivateKeyParameters)
{
SPHINCSPrivateKeyParameters params = (SPHINCSPrivateKeyParameters)privateKey;
AlgorithmIdentifier algorithmIdentifier = new AlgorithmIdentifier(PQCObjectIdentifiers.sphincs256,
new SPHINCS256KeyParams(Utils.sphincs256LookupTreeAlgID(params.getTreeDigest())));
return new PrivateKeyInfo(algorithmIdentifier, new DEROctetString(params.getKeyData()));
}
else if (privateKey instanceof NHPrivateKeyParameters)
{
NHPrivateKeyParameters params = (NHPrivateKeyParameters)privateKey;
AlgorithmIdentifier algorithmIdentifier = new AlgorithmIdentifier(PQCObjectIdentifiers.newHope);
short[] privateKeyData = params.getSecData();
byte[] octets = new byte[privateKeyData.length * 2];
for (int i = 0; i != privateKeyData.length; i++)
{
Pack.shortToLittleEndian(privateKeyData[i], octets, i * 2);
}
return new PrivateKeyInfo(algorithmIdentifier, new DEROctetString(octets));
}
else if (privateKey instanceof LMSPrivateKeyParameters)
{
LMSPrivateKeyParameters params = (LMSPrivateKeyParameters)privateKey;
byte[] encoding = Composer.compose().u32str(1).bytes(params).build();
byte[] pubEncoding = Composer.compose().u32str(1).bytes(params.getPublicKey()).build();
AlgorithmIdentifier algorithmIdentifier = new AlgorithmIdentifier(PKCSObjectIdentifiers.id_alg_hss_lms_hashsig);
return new PrivateKeyInfo(algorithmIdentifier, new DEROctetString(encoding), attributes, pubEncoding);
}
else if (privateKey instanceof HSSPrivateKeyParameters)
{
HSSPrivateKeyParameters params = (HSSPrivateKeyParameters)privateKey;
byte[] encoding = Composer.compose().u32str(params.getL()).bytes(params).build();
byte[] pubEncoding = Composer.compose().u32str(params.getL()).bytes(params.getPublicKey().getLMSPublicKey()).build();
AlgorithmIdentifier algorithmIdentifier = new AlgorithmIdentifier(PKCSObjectIdentifiers.id_alg_hss_lms_hashsig);
return new PrivateKeyInfo(algorithmIdentifier, new DEROctetString(encoding), attributes, pubEncoding);
}
else if (privateKey instanceof XMSSPrivateKeyParameters)
{
XMSSPrivateKeyParameters keyParams = (XMSSPrivateKeyParameters)privateKey;
AlgorithmIdentifier algorithmIdentifier = new AlgorithmIdentifier(PQCObjectIdentifiers.xmss,
new XMSSKeyParams(keyParams.getParameters().getHeight(),
Utils.xmssLookupTreeAlgID(keyParams.getTreeDigest())));
return new PrivateKeyInfo(algorithmIdentifier, xmssCreateKeyStructure(keyParams), attributes);
}
else if (privateKey instanceof XMSSMTPrivateKeyParameters)
{
XMSSMTPrivateKeyParameters keyParams = (XMSSMTPrivateKeyParameters)privateKey;
AlgorithmIdentifier algorithmIdentifier = new AlgorithmIdentifier(PQCObjectIdentifiers.xmss_mt,
new XMSSMTKeyParams(keyParams.getParameters().getHeight(), keyParams.getParameters().getLayers(),
Utils.xmssLookupTreeAlgID(keyParams.getTreeDigest())));
return new PrivateKeyInfo(algorithmIdentifier, xmssmtCreateKeyStructure(keyParams), attributes);
}
else
{
throw new IOException("key parameters not recognized");
}
}
private static XMSSPrivateKey xmssCreateKeyStructure(XMSSPrivateKeyParameters keyParams)
throws IOException
{
byte[] keyData = keyParams.getEncoded();
int n = keyParams.getParameters().getTreeDigestSize();
int totalHeight = keyParams.getParameters().getHeight();
int indexSize = 4;
int secretKeySize = n;
int secretKeyPRFSize = n;
int publicSeedSize = n;
int rootSize = n;
int position = 0;
int index = (int)XMSSUtil.bytesToXBigEndian(keyData, position, indexSize);
if (!XMSSUtil.isIndexValid(totalHeight, index))
{
throw new IllegalArgumentException("index out of bounds");
}
position += indexSize;
byte[] secretKeySeed = XMSSUtil.extractBytesAtOffset(keyData, position, secretKeySize);
position += secretKeySize;
byte[] secretKeyPRF = XMSSUtil.extractBytesAtOffset(keyData, position, secretKeyPRFSize);
position += secretKeyPRFSize;
byte[] publicSeed = XMSSUtil.extractBytesAtOffset(keyData, position, publicSeedSize);
position += publicSeedSize;
byte[] root = XMSSUtil.extractBytesAtOffset(keyData, position, rootSize);
position += rootSize;
/* import BDS state */
byte[] bdsStateBinary = XMSSUtil.extractBytesAtOffset(keyData, position, keyData.length - position);
BDS bds = null;
try
{
bds = (BDS)XMSSUtil.deserialize(bdsStateBinary, BDS.class);
}
catch (ClassNotFoundException e)
{
throw new IOException("cannot parse BDS: " + e.getMessage());
}
if ((bds.getMaxIndex() != (1 << totalHeight) - 1))
{
return new XMSSPrivateKey(index, secretKeySeed, secretKeyPRF, publicSeed, root, bdsStateBinary, bds.getMaxIndex());
}
else
{
return new XMSSPrivateKey(index, secretKeySeed, secretKeyPRF, publicSeed, root, bdsStateBinary);
}
}
private static XMSSMTPrivateKey xmssmtCreateKeyStructure(XMSSMTPrivateKeyParameters keyParams)
throws IOException
{
byte[] keyData = keyParams.getEncoded();
int n = keyParams.getParameters().getTreeDigestSize();
int totalHeight = keyParams.getParameters().getHeight();
int indexSize = (totalHeight + 7) / 8;
int secretKeySize = n;
int secretKeyPRFSize = n;
int publicSeedSize = n;
int rootSize = n;
int position = 0;
int index = (int)XMSSUtil.bytesToXBigEndian(keyData, position, indexSize);
if (!XMSSUtil.isIndexValid(totalHeight, index))
{
throw new IllegalArgumentException("index out of bounds");
}
position += indexSize;
byte[] secretKeySeed = XMSSUtil.extractBytesAtOffset(keyData, position, secretKeySize);
position += secretKeySize;
byte[] secretKeyPRF = XMSSUtil.extractBytesAtOffset(keyData, position, secretKeyPRFSize);
position += secretKeyPRFSize;
byte[] publicSeed = XMSSUtil.extractBytesAtOffset(keyData, position, publicSeedSize);
position += publicSeedSize;
byte[] root = XMSSUtil.extractBytesAtOffset(keyData, position, rootSize);
position += rootSize;
/* import BDS state */
byte[] bdsStateBinary = XMSSUtil.extractBytesAtOffset(keyData, position, keyData.length - position);
BDSStateMap bds = null;
try
{
bds = (BDSStateMap)XMSSUtil.deserialize(bdsStateBinary, BDSStateMap.class);
}
catch (ClassNotFoundException e)
{
throw new IOException("cannot parse BDSStateMap: " + e.getMessage());
}
if ((bds.getMaxIndex() != (1L << totalHeight) - 1))
{
return new XMSSMTPrivateKey(index, secretKeySeed, secretKeyPRF, publicSeed, root, bdsStateBinary, bds.getMaxIndex());
}
else
{
return new XMSSMTPrivateKey(index, secretKeySeed, secretKeyPRF, publicSeed, root, bdsStateBinary);
}
}
}