package com.google.crypto.tink.signature;
import com.google.crypto.tink.PrivateKeyTypeManager;
import com.google.crypto.tink.PublicKeySign;
import com.google.crypto.tink.Registry;
import com.google.crypto.tink.proto.EcdsaKeyFormat;
import com.google.crypto.tink.proto.EcdsaParams;
import com.google.crypto.tink.proto.EcdsaPrivateKey;
import com.google.crypto.tink.proto.EcdsaPublicKey;
import com.google.crypto.tink.proto.KeyData.KeyMaterialType;
import com.google.crypto.tink.subtle.EcdsaSignJce;
import com.google.crypto.tink.subtle.EllipticCurves;
import com.google.crypto.tink.subtle.Validators;
import com.google.protobuf.ByteString;
import com.google.protobuf.ExtensionRegistryLite;
import com.google.protobuf.InvalidProtocolBufferException;
import java.security.GeneralSecurityException;
import java.security.KeyPair;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.spec.ECPoint;
public class EcdsaSignKeyManager extends PrivateKeyTypeManager<EcdsaPrivateKey, EcdsaPublicKey> {
EcdsaSignKeyManager() {
super(
EcdsaPrivateKey.class,
EcdsaPublicKey.class,
new PrimitiveFactory<PublicKeySign, EcdsaPrivateKey>(PublicKeySign.class) {
@Override
public PublicKeySign getPrimitive(EcdsaPrivateKey key) throws GeneralSecurityException {
ECPrivateKey privateKey =
EllipticCurves.getEcPrivateKey(
SigUtil.toCurveType(key.getPublicKey().getParams().getCurve()),
key.getKeyValue().toByteArray());
return new EcdsaSignJce(
privateKey,
SigUtil.toHashType(key.getPublicKey().getParams().getHashType()),
SigUtil.toEcdsaEncoding(key.getPublicKey().getParams().getEncoding()));
}
});
}
@Override
public String getKeyType() {
return "type.googleapis.com/google.crypto.tink.EcdsaPrivateKey";
}
@Override
public int getVersion() {
return 0;
}
@Override
public EcdsaPublicKey getPublicKey(EcdsaPrivateKey key) throws GeneralSecurityException {
return key.getPublicKey();
}
@Override
public KeyMaterialType keyMaterialType() {
return KeyMaterialType.ASYMMETRIC_PRIVATE;
}
@Override
public EcdsaPrivateKey parseKey(ByteString byteString)
throws InvalidProtocolBufferException {
return EcdsaPrivateKey.parseFrom(byteString, ExtensionRegistryLite.getEmptyRegistry());
}
@Override
public void validateKey(EcdsaPrivateKey privKey) throws GeneralSecurityException {
Validators.validateVersion(privKey.getVersion(), getVersion());
SigUtil.validateEcdsaParams(privKey.getPublicKey().getParams());
}
@Override
public KeyFactory<EcdsaKeyFormat, EcdsaPrivateKey> keyFactory() {
return new KeyFactory<EcdsaKeyFormat, EcdsaPrivateKey>(EcdsaKeyFormat.class) {
@Override
public void validateKeyFormat(EcdsaKeyFormat format) throws GeneralSecurityException {
SigUtil.validateEcdsaParams(format.getParams());
}
@Override
public EcdsaKeyFormat parseKeyFormat(ByteString byteString)
throws InvalidProtocolBufferException {
return EcdsaKeyFormat.parseFrom(byteString, ExtensionRegistryLite.getEmptyRegistry());
}
@Override
public EcdsaPrivateKey createKey(EcdsaKeyFormat format) throws GeneralSecurityException {
EcdsaParams ecdsaParams = format.getParams();
KeyPair keyPair =
EllipticCurves.generateKeyPair(SigUtil.toCurveType(ecdsaParams.getCurve()));
ECPublicKey pubKey = (ECPublicKey) keyPair.getPublic();
ECPrivateKey privKey = (ECPrivateKey) keyPair.getPrivate();
ECPoint w = pubKey.getW();
EcdsaPublicKey ecdsaPubKey =
EcdsaPublicKey.newBuilder()
.setVersion(getVersion())
.setParams(ecdsaParams)
.setX(ByteString.copyFrom(w.getAffineX().toByteArray()))
.setY(ByteString.copyFrom(w.getAffineY().toByteArray()))
.build();
return EcdsaPrivateKey.newBuilder()
.setVersion(getVersion())
.setPublicKey(ecdsaPubKey)
.setKeyValue(ByteString.copyFrom(privKey.getS().toByteArray()))
.build();
}
};
}
public static void registerPair(boolean newKeyAllowed) throws GeneralSecurityException {
Registry.registerAsymmetricKeyManagers(
new EcdsaSignKeyManager(), new EcdsaVerifyKeyManager(), newKeyAllowed);
}
}