/*
* Copyright (c) [2016] [ <ether.camp> ]
* This file is part of the ethereumJ library.
*
* The ethereumJ library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ethereumJ library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the ethereumJ library. If not, see <http://www.gnu.org/licenses/>.
*/
package org.ethereum.crypto.jce;
import java.io.IOException;
import java.security.AlgorithmParameters;
import java.security.NoSuchAlgorithmException;
import java.security.spec.ECGenParameterSpec;
import java.security.spec.ECParameterSpec;
import java.security.spec.InvalidParameterSpecException;
public final class ECAlgorithmParameters {
public static final String ALGORITHM = "EC";
public static final String CURVE_NAME = "secp256k1";
private ECAlgorithmParameters() { }
private static class Holder {
private static final AlgorithmParameters INSTANCE;
private static final ECGenParameterSpec SECP256K1_CURVE
= new ECGenParameterSpec(CURVE_NAME);
static {
try {
INSTANCE = AlgorithmParameters.getInstance(ALGORITHM);
INSTANCE.init(SECP256K1_CURVE);
} catch (NoSuchAlgorithmException ex) {
throw new AssertionError(
"Assumed the JRE supports EC algorithm params", ex);
} catch (InvalidParameterSpecException ex) {
throw new AssertionError(
"Assumed correct key spec statically", ex);
}
}
}
public static ECParameterSpec getParameterSpec() {
try {
return Holder.INSTANCE.getParameterSpec(ECParameterSpec.class);
} catch (InvalidParameterSpecException ex) {
throw new AssertionError(
"Assumed correct key spec statically", ex);
}
}
public static byte[] getASN1Encoding() {
try {
return Holder.INSTANCE.getEncoded();
} catch (IOException ex) {
throw new AssertionError(
"Assumed algo params has been initialized", ex);
}
}
}