io.jsonwebtoken.impl.crypto.EllipticCurveSigner Maven / Gradle / Ivy
/*
* Copyright (C) 2015 jsonwebtoken.io
*
* Licensed 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 io.jsonwebtoken.impl.crypto;
import io.jsonwebtoken.SignatureAlgorithm;
import io.jsonwebtoken.SignatureException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.PrivateKey;
import java.security.Signature;
import java.security.interfaces.ECPrivateKey;
public class EllipticCurveSigner extends EllipticCurveProvider implements Signer {
public EllipticCurveSigner(SignatureAlgorithm alg, Key key) {
super(alg, key);
if (!(key instanceof ECPrivateKey)) {
String msg = "Elliptic Curve signatures must be computed using an ECPrivateKey. The specified key of " +
"type " + key.getClass().getName() + " is not an ECPrivateKey.";
throw new IllegalArgumentException(msg);
}
}
@Override
public byte[] sign(byte[] data) {
try {
return doSign(data);
} catch (InvalidKeyException e) {
throw new SignatureException("Invalid Elliptic Curve PrivateKey. " + e.getMessage(), e);
} catch (java.security.SignatureException e) {
throw new SignatureException("Unable to calculate signature using Elliptic Curve PrivateKey. " + e.getMessage(), e);
}
}
protected byte[] doSign(byte[] data) throws InvalidKeyException, java.security.SignatureException {
PrivateKey privateKey = (PrivateKey)key;
Signature sig = createSignatureInstance();
sig.initSign(privateKey);
sig.update(data);
return sig.sign();
}
}