/**

* EdDSA-Java by str4d
*
* To the extent possible under law, the person who associated CC0 with
* EdDSA-Java has waived all copyright and related or neighboring rights
* to EdDSA-Java.
*
* You should have received a copy of the CC0 legalcode along with this
* work. If not, see <https://creativecommons.org/publicdomain/zero/1.0/>.
*
*/

package net.i2p.crypto.eddsa;

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 net.i2p.crypto.eddsa.spec.EdDSAPrivateKeySpec; import net.i2p.crypto.eddsa.spec.EdDSAPublicKeySpec;

/**

* @author str4d
*
*/

public final class KeyFactory extends KeyFactorySpi {

protected PrivateKey engineGeneratePrivate(KeySpec keySpec)
        throws InvalidKeySpecException {
    if (keySpec instanceof EdDSAPrivateKeySpec) {
        return new EdDSAPrivateKey((EdDSAPrivateKeySpec) keySpec);
    }
    if (keySpec instanceof PKCS8EncodedKeySpec) {
        return new EdDSAPrivateKey((PKCS8EncodedKeySpec) keySpec);
    }
    throw new InvalidKeySpecException("key spec not recognised: " + keySpec.getClass());
}

protected PublicKey engineGeneratePublic(KeySpec keySpec)
        throws InvalidKeySpecException {
    if (keySpec instanceof EdDSAPublicKeySpec) {
        return new EdDSAPublicKey((EdDSAPublicKeySpec) keySpec);
    }
    if (keySpec instanceof X509EncodedKeySpec) {
        return new EdDSAPublicKey((X509EncodedKeySpec) keySpec);
    }
    throw new InvalidKeySpecException("key spec not recognised: " + keySpec.getClass());
}

@SuppressWarnings("unchecked")
protected <T extends KeySpec> T engineGetKeySpec(Key key, Class<T> keySpec)
        throws InvalidKeySpecException {
    if (keySpec.isAssignableFrom(EdDSAPublicKeySpec.class) && key instanceof EdDSAPublicKey) {
        EdDSAPublicKey k = (EdDSAPublicKey) key;
        if (k.getParams() != null) {
            return (T) new EdDSAPublicKeySpec(k.getA(), k.getParams());
        }
    } else if (keySpec.isAssignableFrom(EdDSAPrivateKeySpec.class) && key instanceof EdDSAPrivateKey) {
        EdDSAPrivateKey k = (EdDSAPrivateKey) key;
        if (k.getParams() != null) {
            return (T) new EdDSAPrivateKeySpec(k.getSeed(), k.getH(), k.geta(), k.getA(), k.getParams());
        }
    }
    throw new InvalidKeySpecException("not implemented yet " + key + " " + keySpec);
}

protected Key engineTranslateKey(Key key) throws InvalidKeyException {
    throw new InvalidKeyException("No other EdDSA key providers known");
}

}