diff options
Diffstat (limited to 'prov/src/main/java/org/spongycastle/jce/provider/JCEElGamalPrivateKey.java')
-rw-r--r-- | prov/src/main/java/org/spongycastle/jce/provider/JCEElGamalPrivateKey.java | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/prov/src/main/java/org/spongycastle/jce/provider/JCEElGamalPrivateKey.java b/prov/src/main/java/org/spongycastle/jce/provider/JCEElGamalPrivateKey.java new file mode 100644 index 00000000..4d98792c --- /dev/null +++ b/prov/src/main/java/org/spongycastle/jce/provider/JCEElGamalPrivateKey.java @@ -0,0 +1,165 @@ +package org.spongycastle.jce.provider; + +import java.io.IOException; +import java.io.ObjectInputStream; +import java.io.ObjectOutputStream; +import java.math.BigInteger; +import java.util.Enumeration; + +import javax.crypto.interfaces.DHPrivateKey; +import javax.crypto.spec.DHParameterSpec; +import javax.crypto.spec.DHPrivateKeySpec; + +import org.spongycastle.asn1.ASN1Encodable; +import org.spongycastle.asn1.ASN1Integer; +import org.spongycastle.asn1.ASN1ObjectIdentifier; +import org.spongycastle.asn1.oiw.ElGamalParameter; +import org.spongycastle.asn1.oiw.OIWObjectIdentifiers; +import org.spongycastle.asn1.pkcs.PrivateKeyInfo; +import org.spongycastle.asn1.x509.AlgorithmIdentifier; +import org.spongycastle.crypto.params.ElGamalPrivateKeyParameters; +import org.spongycastle.jcajce.provider.asymmetric.util.KeyUtil; +import org.spongycastle.jcajce.provider.asymmetric.util.PKCS12BagAttributeCarrierImpl; +import org.spongycastle.jce.interfaces.ElGamalPrivateKey; +import org.spongycastle.jce.interfaces.PKCS12BagAttributeCarrier; +import org.spongycastle.jce.spec.ElGamalParameterSpec; +import org.spongycastle.jce.spec.ElGamalPrivateKeySpec; + +public class JCEElGamalPrivateKey + implements ElGamalPrivateKey, DHPrivateKey, PKCS12BagAttributeCarrier +{ + static final long serialVersionUID = 4819350091141529678L; + + BigInteger x; + + ElGamalParameterSpec elSpec; + + private PKCS12BagAttributeCarrierImpl attrCarrier = new PKCS12BagAttributeCarrierImpl(); + + protected JCEElGamalPrivateKey() + { + } + + JCEElGamalPrivateKey( + ElGamalPrivateKey key) + { + this.x = key.getX(); + this.elSpec = key.getParameters(); + } + + JCEElGamalPrivateKey( + DHPrivateKey key) + { + this.x = key.getX(); + this.elSpec = new ElGamalParameterSpec(key.getParams().getP(), key.getParams().getG()); + } + + JCEElGamalPrivateKey( + ElGamalPrivateKeySpec spec) + { + this.x = spec.getX(); + this.elSpec = new ElGamalParameterSpec(spec.getParams().getP(), spec.getParams().getG()); + } + + JCEElGamalPrivateKey( + DHPrivateKeySpec spec) + { + this.x = spec.getX(); + this.elSpec = new ElGamalParameterSpec(spec.getP(), spec.getG()); + } + + JCEElGamalPrivateKey( + PrivateKeyInfo info) + throws IOException + { + ElGamalParameter params = ElGamalParameter.getInstance(info.getPrivateKeyAlgorithm().getParameters()); + ASN1Integer derX = ASN1Integer.getInstance(info.parsePrivateKey()); + + this.x = derX.getValue(); + this.elSpec = new ElGamalParameterSpec(params.getP(), params.getG()); + } + + JCEElGamalPrivateKey( + ElGamalPrivateKeyParameters params) + { + this.x = params.getX(); + this.elSpec = new ElGamalParameterSpec(params.getParameters().getP(), params.getParameters().getG()); + } + + public String getAlgorithm() + { + return "ElGamal"; + } + + /** + * return the encoding format we produce in getEncoded(). + * + * @return the string "PKCS#8" + */ + public String getFormat() + { + return "PKCS#8"; + } + + /** + * Return a PKCS8 representation of the key. The sequence returned + * represents a full PrivateKeyInfo object. + * + * @return a PKCS8 representation of the key. + */ + public byte[] getEncoded() + { + return KeyUtil.getEncodedPrivateKeyInfo(new AlgorithmIdentifier(OIWObjectIdentifiers.elGamalAlgorithm, new ElGamalParameter(elSpec.getP(), elSpec.getG())), new ASN1Integer(getX())); + } + + public ElGamalParameterSpec getParameters() + { + return elSpec; + } + + public DHParameterSpec getParams() + { + return new DHParameterSpec(elSpec.getP(), elSpec.getG()); + } + + public BigInteger getX() + { + return x; + } + + private void readObject( + ObjectInputStream in) + throws IOException, ClassNotFoundException + { + x = (BigInteger)in.readObject(); + + this.elSpec = new ElGamalParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject()); + } + + private void writeObject( + ObjectOutputStream out) + throws IOException + { + out.writeObject(this.getX()); + out.writeObject(elSpec.getP()); + out.writeObject(elSpec.getG()); + } + + public void setBagAttribute( + ASN1ObjectIdentifier oid, + ASN1Encodable attribute) + { + attrCarrier.setBagAttribute(oid, attribute); + } + + public ASN1Encodable getBagAttribute( + ASN1ObjectIdentifier oid) + { + return attrCarrier.getBagAttribute(oid); + } + + public Enumeration getBagAttributeKeys() + { + return attrCarrier.getBagAttributeKeys(); + } +} |