org.tomitribe.auth.signatures.EC Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.tomitribe.auth.signatures;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.EncodedKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
/**
* Utility for Elliptic Curve keys.
*/
public enum EC {
;
private static final String EC = "EC";
private static final String SUNEC = "SunEC"; // Sun's ECC provider
/**
* Returns a private key constructed from the given DER bytes in PKCS#8 format.
*/
public static PrivateKey privateKeyFromPKCS8(final byte[] pkcs8) throws InvalidKeySpecException {
try {
final EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(pkcs8);
final KeyFactory keyFactory = KeyFactory.getInstance(EC, SUNEC);
return keyFactory.generatePrivate(privateKeySpec);
} catch (NoSuchAlgorithmException e) {
throw new IllegalStateException(e);
} catch (NoSuchProviderException e) {
throw new IllegalStateException(e);
}
}
/**
* Returns a public key constructed from the given DER bytes.
*/
public static PublicKey publicKeyFrom(final byte[] derBytes) throws InvalidKeySpecException {
try {
final KeyFactory keyFactory = KeyFactory.getInstance(EC, SUNEC);
final EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(derBytes);
return keyFactory.generatePublic(publicKeySpec);
} catch (NoSuchAlgorithmException e) {
throw new IllegalStateException(e);
} catch (NoSuchProviderException e) {
throw new IllegalStateException(e);
}
}
}