| 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.ASN1OctetString; |
| import org.bouncycastle.asn1.ASN1Primitive; |
| import org.bouncycastle.asn1.DEROctetString; |
| // Android-removed: Unsupported algorithm |
| // import org.bouncycastle.asn1.oiw.ElGamalParameter; |
| import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers; |
| import org.bouncycastle.asn1.pkcs.DHParameter; |
| import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers; |
| import org.bouncycastle.asn1.pkcs.RSAPublicKey; |
| import org.bouncycastle.asn1.x509.AlgorithmIdentifier; |
| import org.bouncycastle.asn1.x509.DSAParameter; |
| import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo; |
| import org.bouncycastle.asn1.x509.X509ObjectIdentifiers; |
| import org.bouncycastle.asn1.x9.DHPublicKey; |
| import org.bouncycastle.asn1.x9.DomainParameters; |
| import org.bouncycastle.asn1.x9.ECNamedCurveTable; |
| import org.bouncycastle.asn1.x9.ValidationParams; |
| 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.ec.CustomNamedCurves; |
| import org.bouncycastle.crypto.params.AsymmetricKeyParameter; |
| import org.bouncycastle.crypto.params.DHParameters; |
| import org.bouncycastle.crypto.params.DHPublicKeyParameters; |
| import org.bouncycastle.crypto.params.DHValidationParameters; |
| import org.bouncycastle.crypto.params.DSAParameters; |
| import org.bouncycastle.crypto.params.DSAPublicKeyParameters; |
| import org.bouncycastle.crypto.params.ECDomainParameters; |
| import org.bouncycastle.crypto.params.ECNamedDomainParameters; |
| import org.bouncycastle.crypto.params.ECPublicKeyParameters; |
| // Android-removed: Unsupported algorithm |
| // import org.bouncycastle.crypto.params.ElGamalParameters; |
| // import org.bouncycastle.crypto.params.ElGamalPublicKeyParameters; |
| import org.bouncycastle.crypto.params.RSAKeyParameters; |
| |
| /** |
| * Factory to create asymmetric public key parameters for asymmetric ciphers from range of |
| * ASN.1 encoded SubjectPublicKeyInfo objects. |
| */ |
| public class PublicKeyFactory |
| { |
| /** |
| * Create a public key from a SubjectPublicKeyInfo encoding |
| * |
| * @param keyInfoData the SubjectPublicKeyInfo encoding |
| * @return the appropriate key parameter |
| * @throws IOException on an error decoding the key |
| */ |
| public static AsymmetricKeyParameter createKey(byte[] keyInfoData) throws IOException |
| { |
| return createKey(SubjectPublicKeyInfo.getInstance(ASN1Primitive.fromByteArray(keyInfoData))); |
| } |
| |
| /** |
| * Create a public key from a SubjectPublicKeyInfo encoding read from a stream |
| * |
| * @param inStr the stream to read the SubjectPublicKeyInfo encoding from |
| * @return the appropriate key parameter |
| * @throws IOException on an error decoding the key |
| */ |
| public static AsymmetricKeyParameter createKey(InputStream inStr) throws IOException |
| { |
| return createKey(SubjectPublicKeyInfo.getInstance(new ASN1InputStream(inStr).readObject())); |
| } |
| |
| /** |
| * Create a public key from the passed in SubjectPublicKeyInfo |
| * |
| * @param keyInfo the SubjectPublicKeyInfo containing the key data |
| * @return the appropriate key parameter |
| * @throws IOException on an error decoding the key |
| */ |
| public static AsymmetricKeyParameter createKey(SubjectPublicKeyInfo keyInfo) throws IOException |
| { |
| AlgorithmIdentifier algId = keyInfo.getAlgorithm(); |
| |
| if (algId.getAlgorithm().equals(PKCSObjectIdentifiers.rsaEncryption) |
| || algId.getAlgorithm().equals(X509ObjectIdentifiers.id_ea_rsa)) |
| { |
| RSAPublicKey pubKey = RSAPublicKey.getInstance(keyInfo.parsePublicKey()); |
| |
| return new RSAKeyParameters(false, pubKey.getModulus(), pubKey.getPublicExponent()); |
| } |
| else if (algId.getAlgorithm().equals(X9ObjectIdentifiers.dhpublicnumber)) |
| { |
| DHPublicKey dhPublicKey = DHPublicKey.getInstance(keyInfo.parsePublicKey()); |
| |
| BigInteger y = dhPublicKey.getY(); |
| |
| DomainParameters dhParams = DomainParameters.getInstance(algId.getParameters()); |
| |
| BigInteger p = dhParams.getP(); |
| BigInteger g = dhParams.getG(); |
| BigInteger q = dhParams.getQ(); |
| |
| BigInteger j = null; |
| if (dhParams.getJ() != null) |
| { |
| j = dhParams.getJ(); |
| } |
| |
| DHValidationParameters validation = null; |
| ValidationParams dhValidationParms = dhParams.getValidationParams(); |
| if (dhValidationParms != null) |
| { |
| byte[] seed = dhValidationParms.getSeed(); |
| BigInteger pgenCounter = dhValidationParms.getPgenCounter(); |
| |
| // TODO Check pgenCounter size? |
| |
| validation = new DHValidationParameters(seed, pgenCounter.intValue()); |
| } |
| |
| return new DHPublicKeyParameters(y, new DHParameters(p, g, q, j, validation)); |
| } |
| else if (algId.getAlgorithm().equals(PKCSObjectIdentifiers.dhKeyAgreement)) |
| { |
| DHParameter params = DHParameter.getInstance(algId.getParameters()); |
| ASN1Integer derY = (ASN1Integer)keyInfo.parsePublicKey(); |
| |
| BigInteger lVal = params.getL(); |
| int l = lVal == null ? 0 : lVal.intValue(); |
| DHParameters dhParams = new DHParameters(params.getP(), params.getG(), null, l); |
| |
| return new DHPublicKeyParameters(derY.getValue(), dhParams); |
| } |
| // BEGIN Android-removed: Unsupported algorithm |
| /* |
| else if (algId.getAlgorithm().equals(OIWObjectIdentifiers.elGamalAlgorithm)) |
| { |
| ElGamalParameter params = ElGamalParameter.getInstance(algId.getParameters()); |
| ASN1Integer derY = (ASN1Integer)keyInfo.parsePublicKey(); |
| |
| return new ElGamalPublicKeyParameters(derY.getValue(), new ElGamalParameters( |
| params.getP(), params.getG())); |
| } |
| */ |
| // END Android-removed: Unsupported algorithm |
| else if (algId.getAlgorithm().equals(X9ObjectIdentifiers.id_dsa) |
| || algId.getAlgorithm().equals(OIWObjectIdentifiers.dsaWithSHA1)) |
| { |
| ASN1Integer derY = (ASN1Integer)keyInfo.parsePublicKey(); |
| 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 DSAPublicKeyParameters(derY.getValue(), parameters); |
| } |
| else if (algId.getAlgorithm().equals(X9ObjectIdentifiers.id_ecPublicKey)) |
| { |
| X962Parameters params = X962Parameters.getInstance(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()); |
| } |
| |
| ASN1OctetString key = new DEROctetString(keyInfo.getPublicKeyData().getBytes()); |
| X9ECPoint derQ = new X9ECPoint(x9.getCurve(), key); |
| |
| return new ECPublicKeyParameters(derQ.getPoint(), dParams); |
| } |
| else |
| { |
| throw new RuntimeException("algorithm identifier in key not recognised"); |
| } |
| } |
| } |