org.bouncycastle.pqc.jcajce.provider.mceliece.McElieceKeyFactorySpi Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of bouncycastle Show documentation
Show all versions of bouncycastle Show documentation
The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar
contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one
provided with the Bouncy Castle Cryptography APIs.
package org.bouncycastle.pqc.jcajce.provider.mceliece;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.KeyFactorySpi;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SHA256Digest;
import org.bouncycastle.jcajce.provider.util.AsymmetricKeyInfoConverter;
import org.bouncycastle.pqc.asn1.McEliecePrivateKey;
import org.bouncycastle.pqc.asn1.McEliecePublicKey;
import org.bouncycastle.pqc.asn1.PQCObjectIdentifiers;
import org.bouncycastle.pqc.crypto.mceliece.McEliecePrivateKeyParameters;
import org.bouncycastle.pqc.crypto.mceliece.McEliecePublicKeyParameters;
/**
* This class is used to translate between McEliece keys and key specifications.
*
* @see BCMcEliecePrivateKey
* @see BCMcEliecePublicKey
*/
public class McElieceKeyFactorySpi
extends KeyFactorySpi
implements AsymmetricKeyInfoConverter
{
/**
* The OID of the algorithm.
*/
public static final String OID = "1.3.6.1.4.1.8301.3.1.3.4.1";
/**
* Converts, if possible, a key specification into a
* {@link BCMcEliecePublicKey}. {@link X509EncodedKeySpec}.
*
* @param keySpec the key specification
* @return the McEliece public key
* @throws InvalidKeySpecException if the key specification is not supported.
*/
protected PublicKey engineGeneratePublic(KeySpec keySpec)
throws InvalidKeySpecException
{
if (keySpec instanceof X509EncodedKeySpec)
{
// get the DER-encoded Key according to X.509 from the spec
byte[] encKey = ((X509EncodedKeySpec)keySpec).getEncoded();
// decode the SubjectPublicKeyInfo data structure to the pki object
SubjectPublicKeyInfo pki;
try
{
pki = SubjectPublicKeyInfo.getInstance(ASN1Primitive.fromByteArray(encKey));
}
catch (IOException e)
{
throw new InvalidKeySpecException(e.toString());
}
try
{
if (PQCObjectIdentifiers.mcEliece.equals(pki.getAlgorithm().getAlgorithm()))
{
McEliecePublicKey key = McEliecePublicKey.getInstance(pki.parsePublicKey());
return new BCMcEliecePublicKey(new McEliecePublicKeyParameters(key.getN(), key.getT(), key.getG()));
}
else
{
throw new InvalidKeySpecException("Unable to recognise OID in McEliece public key");
}
}
catch (IOException cce)
{
throw new InvalidKeySpecException(
"Unable to decode X509EncodedKeySpec: "
+ cce.getMessage());
}
}
throw new InvalidKeySpecException("Unsupported key specification: "
+ keySpec.getClass() + ".");
}
/**
* Converts, if possible, a key specification into a
* {@link BCMcEliecePrivateKey}.
*
* @param keySpec the key specification
* @return the McEliece private key
* @throws InvalidKeySpecException if the KeySpec is not supported.
*/
protected PrivateKey engineGeneratePrivate(KeySpec keySpec)
throws InvalidKeySpecException
{
if (keySpec instanceof PKCS8EncodedKeySpec)
{
// get the DER-encoded Key according to PKCS#8 from the spec
byte[] encKey = ((PKCS8EncodedKeySpec)keySpec).getEncoded();
// decode the PKCS#8 data structure to the pki object
PrivateKeyInfo pki;
try
{
pki = PrivateKeyInfo.getInstance(ASN1Primitive.fromByteArray(encKey));
}
catch (IOException e)
{
throw new InvalidKeySpecException("Unable to decode PKCS8EncodedKeySpec: " + e);
}
try
{
if (PQCObjectIdentifiers.mcEliece.equals(pki.getPrivateKeyAlgorithm().getAlgorithm()))
{
McEliecePrivateKey key = McEliecePrivateKey.getInstance(pki.parsePrivateKey());
return new BCMcEliecePrivateKey(new McEliecePrivateKeyParameters(key.getN(), key.getK(), key.getField(), key.getGoppaPoly(), key.getP1(), key.getP2(), key.getSInv()));
}
else
{
throw new InvalidKeySpecException("Unable to recognise OID in McEliece private key");
}
}
catch (IOException cce)
{
throw new InvalidKeySpecException(
"Unable to decode PKCS8EncodedKeySpec.");
}
}
throw new InvalidKeySpecException("Unsupported key specification: "
+ keySpec.getClass() + ".");
}
/**
* Converts, if possible, a given key into a key specification. Currently,
* the following key specifications are supported:
*
* @param key the key
* @param keySpec the key specification
* @return the specification of the McEliece key
* @throws InvalidKeySpecException if the key type or the key specification is not
* supported.
* @see BCMcEliecePrivateKey
* @see BCMcEliecePublicKey
*/
public KeySpec getKeySpec(Key key, Class keySpec)
throws InvalidKeySpecException
{
if (key instanceof BCMcEliecePrivateKey)
{
if (PKCS8EncodedKeySpec.class.isAssignableFrom(keySpec))
{
return new PKCS8EncodedKeySpec(key.getEncoded());
}
}
else if (key instanceof BCMcEliecePublicKey)
{
if (X509EncodedKeySpec.class.isAssignableFrom(keySpec))
{
return new X509EncodedKeySpec(key.getEncoded());
}
}
else
{
throw new InvalidKeySpecException("Unsupported key type: "
+ key.getClass() + ".");
}
throw new InvalidKeySpecException("Unknown key specification: "
+ keySpec + ".");
}
/**
* Translates a key into a form known by the FlexiProvider. Currently, only
* the following "source" keys are supported: {@link BCMcEliecePrivateKey},
* {@link BCMcEliecePublicKey}.
*
* @param key the key
* @return a key of a known key type
* @throws InvalidKeyException if the key type is not supported.
*/
public Key translateKey(Key key)
throws InvalidKeyException
{
if ((key instanceof BCMcEliecePrivateKey)
|| (key instanceof BCMcEliecePublicKey))
{
return key;
}
throw new InvalidKeyException("Unsupported key type.");
}
public PublicKey generatePublic(SubjectPublicKeyInfo pki)
throws IOException
{
// get the inner type inside the BIT STRING
ASN1Primitive innerType = pki.parsePublicKey();
McEliecePublicKey key = McEliecePublicKey.getInstance(innerType);
return new BCMcEliecePublicKey(new McEliecePublicKeyParameters(key.getN(), key.getT(), key.getG()));
}
public PrivateKey generatePrivate(PrivateKeyInfo pki)
throws IOException
{
// get the inner type inside the BIT STRING
ASN1Primitive innerType = pki.parsePrivateKey().toASN1Primitive();
McEliecePrivateKey key = McEliecePrivateKey.getInstance(innerType);
return new BCMcEliecePrivateKey(new McEliecePrivateKeyParameters(key.getN(), key.getK(), key.getField(), key.getGoppaPoly(), key.getP1(), key.getP2(), key.getSInv()));
}
protected KeySpec engineGetKeySpec(Key key, Class tClass)
throws InvalidKeySpecException
{
// TODO:
return null; //To change body of implemented methods use File | Settings | File Templates.
}
protected Key engineTranslateKey(Key key)
throws InvalidKeyException
{
// TODO:
return null; //To change body of implemented methods use File | Settings | File Templates.
}
private static Digest getDigest(AlgorithmIdentifier algId)
{
return new SHA256Digest();
}
}