| package org.bouncycastle.crypto.util; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.math.BigInteger; |
| |
| import org.bouncycastle.asn1.ASN1Encodable; |
| import org.bouncycastle.asn1.ASN1InputStream; |
| import org.bouncycastle.asn1.ASN1Integer; |
| import org.bouncycastle.asn1.ASN1ObjectIdentifier; |
| import org.bouncycastle.asn1.ASN1Primitive; |
| // BEGIN android-removed |
| // import org.bouncycastle.asn1.oiw.ElGamalParameter; |
| // END android-removed |
| import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers; |
| import org.bouncycastle.asn1.pkcs.DHParameter; |
| import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers; |
| import org.bouncycastle.asn1.pkcs.PrivateKeyInfo; |
| import org.bouncycastle.asn1.pkcs.RSAPrivateKey; |
| import org.bouncycastle.asn1.sec.ECPrivateKey; |
| import org.bouncycastle.asn1.x509.AlgorithmIdentifier; |
| import org.bouncycastle.asn1.x509.DSAParameter; |
| import org.bouncycastle.asn1.x9.ECNamedCurveTable; |
| import org.bouncycastle.asn1.x9.X962Parameters; |
| import org.bouncycastle.asn1.x9.X9ECParameters; |
| import org.bouncycastle.asn1.x9.X9ObjectIdentifiers; |
| import org.bouncycastle.crypto.ec.CustomNamedCurves; |
| import org.bouncycastle.crypto.params.AsymmetricKeyParameter; |
| import org.bouncycastle.crypto.params.DHParameters; |
| import org.bouncycastle.crypto.params.DHPrivateKeyParameters; |
| import org.bouncycastle.crypto.params.DSAParameters; |
| import org.bouncycastle.crypto.params.DSAPrivateKeyParameters; |
| import org.bouncycastle.crypto.params.ECDomainParameters; |
| import org.bouncycastle.crypto.params.ECNamedDomainParameters; |
| import org.bouncycastle.crypto.params.ECPrivateKeyParameters; |
| // BEGIN android-removed |
| // import org.bouncycastle.crypto.params.ElGamalParameters; |
| // import org.bouncycastle.crypto.params.ElGamalPrivateKeyParameters; |
| // END android-removed |
| import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters; |
| |
| /** |
| * Factory for creating private key objects from PKCS8 PrivateKeyInfo objects. |
| */ |
| public class PrivateKeyFactory |
| { |
| /** |
| * Create a private key parameter from a PKCS8 PrivateKeyInfo encoding. |
| * |
| * @param privateKeyInfoData the PrivateKeyInfo encoding |
| * @return a suitable private key parameter |
| * @throws IOException on an error decoding the key |
| */ |
| public static AsymmetricKeyParameter createKey(byte[] privateKeyInfoData) throws IOException |
| { |
| return createKey(PrivateKeyInfo.getInstance(ASN1Primitive.fromByteArray(privateKeyInfoData))); |
| } |
| |
| /** |
| * Create a private key parameter from a PKCS8 PrivateKeyInfo encoding read from a |
| * stream. |
| * |
| * @param inStr the stream to read the PrivateKeyInfo encoding from |
| * @return a suitable private key parameter |
| * @throws IOException on an error decoding the key |
| */ |
| public static AsymmetricKeyParameter createKey(InputStream inStr) throws IOException |
| { |
| return createKey(PrivateKeyInfo.getInstance(new ASN1InputStream(inStr).readObject())); |
| } |
| |
| /** |
| * Create a private key parameter from the passed in PKCS8 PrivateKeyInfo object. |
| * |
| * @param keyInfo the PrivateKeyInfo object containing the key material |
| * @return a suitable private key parameter |
| * @throws IOException on an error decoding the key |
| */ |
| public static AsymmetricKeyParameter createKey(PrivateKeyInfo keyInfo) throws IOException |
| { |
| AlgorithmIdentifier algId = keyInfo.getPrivateKeyAlgorithm(); |
| |
| if (algId.getAlgorithm().equals(PKCSObjectIdentifiers.rsaEncryption)) |
| { |
| RSAPrivateKey keyStructure = RSAPrivateKey.getInstance(keyInfo.parsePrivateKey()); |
| |
| return new RSAPrivateCrtKeyParameters(keyStructure.getModulus(), |
| keyStructure.getPublicExponent(), keyStructure.getPrivateExponent(), |
| keyStructure.getPrime1(), keyStructure.getPrime2(), keyStructure.getExponent1(), |
| keyStructure.getExponent2(), keyStructure.getCoefficient()); |
| } |
| // TODO? |
| // else if (algId.getObjectId().equals(X9ObjectIdentifiers.dhpublicnumber)) |
| else if (algId.getAlgorithm().equals(PKCSObjectIdentifiers.dhKeyAgreement)) |
| { |
| DHParameter params = DHParameter.getInstance(algId.getParameters()); |
| ASN1Integer derX = (ASN1Integer)keyInfo.parsePrivateKey(); |
| |
| BigInteger lVal = params.getL(); |
| int l = lVal == null ? 0 : lVal.intValue(); |
| DHParameters dhParams = new DHParameters(params.getP(), params.getG(), null, l); |
| |
| return new DHPrivateKeyParameters(derX.getValue(), dhParams); |
| } |
| // BEGIN android-removed |
| // else if (algId.getAlgorithm().equals(OIWObjectIdentifiers.elGamalAlgorithm)) |
| // { |
| // ElGamalParameter params = ElGamalParameter.getInstance(algId.getParameters()); |
| // ASN1Integer derX = (ASN1Integer)keyInfo.parsePrivateKey(); |
| // |
| // return new ElGamalPrivateKeyParameters(derX.getValue(), new ElGamalParameters( |
| // params.getP(), params.getG())); |
| // } |
| // END android-removed |
| else if (algId.getAlgorithm().equals(X9ObjectIdentifiers.id_dsa)) |
| { |
| ASN1Integer derX = (ASN1Integer)keyInfo.parsePrivateKey(); |
| ASN1Encodable de = algId.getParameters(); |
| |
| DSAParameters parameters = null; |
| if (de != null) |
| { |
| DSAParameter params = DSAParameter.getInstance(de.toASN1Primitive()); |
| parameters = new DSAParameters(params.getP(), params.getQ(), params.getG()); |
| } |
| |
| return new DSAPrivateKeyParameters(derX.getValue(), parameters); |
| } |
| else if (algId.getAlgorithm().equals(X9ObjectIdentifiers.id_ecPublicKey)) |
| { |
| X962Parameters params = new X962Parameters((ASN1Primitive)algId.getParameters()); |
| |
| X9ECParameters x9; |
| ECDomainParameters dParams; |
| |
| if (params.isNamedCurve()) |
| { |
| ASN1ObjectIdentifier oid = (ASN1ObjectIdentifier)params.getParameters(); |
| |
| x9 = CustomNamedCurves.getByOID(oid); |
| if (x9 == null) |
| { |
| x9 = ECNamedCurveTable.getByOID(oid); |
| } |
| dParams = new ECNamedDomainParameters( |
| oid, x9.getCurve(), x9.getG(), x9.getN(), x9.getH(), x9.getSeed()); |
| } |
| else |
| { |
| x9 = X9ECParameters.getInstance(params.getParameters()); |
| dParams = new ECDomainParameters( |
| x9.getCurve(), x9.getG(), x9.getN(), x9.getH(), x9.getSeed()); |
| } |
| |
| ECPrivateKey ec = ECPrivateKey.getInstance(keyInfo.parsePrivateKey()); |
| BigInteger d = ec.getKey(); |
| |
| return new ECPrivateKeyParameters(d, dParams); |
| } |
| else |
| { |
| throw new RuntimeException("algorithm identifier in key not recognised"); |
| } |
| } |
| } |