org.conscrypt.ECParameters Maven / Gradle / Ivy
/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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 org.conscrypt;
import java.io.IOException;
import java.security.AlgorithmParametersSpi;
import java.security.InvalidAlgorithmParameterException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.ECGenParameterSpec;
import java.security.spec.ECParameterSpec;
import java.security.spec.InvalidParameterSpecException;
/**
* AlgorithmParameters implementation for elliptic curves. The only supported encoding format is
* ASN.1, as specified in RFC 3279, section 2.3.5. However, only named curves are supported.
*/
@Internal
public class ECParameters extends AlgorithmParametersSpi {
private OpenSSLECGroupContext curve;
public ECParameters() {}
@Override
protected void engineInit(AlgorithmParameterSpec algorithmParameterSpec)
throws InvalidParameterSpecException {
if (algorithmParameterSpec instanceof ECGenParameterSpec) {
String newCurveName = ((ECGenParameterSpec) algorithmParameterSpec).getName();
OpenSSLECGroupContext newCurve = OpenSSLECGroupContext.getCurveByName(newCurveName);
if (newCurve == null) {
throw new InvalidParameterSpecException("Unknown EC curve name: " + newCurveName);
}
this.curve = newCurve;
} else if (algorithmParameterSpec instanceof ECParameterSpec) {
ECParameterSpec ecParamSpec = (ECParameterSpec) algorithmParameterSpec;
try {
OpenSSLECGroupContext newCurve = OpenSSLECGroupContext.getInstance(ecParamSpec);
if (newCurve == null) {
throw new InvalidParameterSpecException("Unknown EC curve: " + ecParamSpec);
}
this.curve = newCurve;
} catch (InvalidAlgorithmParameterException e) {
throw new InvalidParameterSpecException(e.getMessage());
}
} else {
throw new InvalidParameterSpecException(
"Only ECParameterSpec and ECGenParameterSpec are supported");
}
}
@Override
protected void engineInit(byte[] bytes) throws IOException {
long ref = NativeCrypto.EC_KEY_parse_curve_name(bytes);
if (ref == 0) {
throw new IOException("Error reading ASN.1 encoding");
}
this.curve = new OpenSSLECGroupContext(new NativeRef.EC_GROUP(ref));
}
@Override
protected void engineInit(byte[] bytes, String format) throws IOException {
if (format == null || format.equals("ASN.1")) {
engineInit(bytes);
} else {
throw new IOException("Unsupported format: " + format);
}
}
@Override
@SuppressWarnings("unchecked")
protected T engineGetParameterSpec(Class aClass)
throws InvalidParameterSpecException {
if (aClass == ECParameterSpec.class) {
return (T) curve.getECParameterSpec();
} else if (aClass == ECGenParameterSpec.class) {
return (T) new ECGenParameterSpec(Platform.getCurveName(curve.getECParameterSpec()));
} else {
throw new InvalidParameterSpecException("Unsupported class: " + aClass);
}
}
@Override
protected byte[] engineGetEncoded() throws IOException {
return NativeCrypto.EC_KEY_marshal_curve_name(curve.getNativeRef());
}
@Override
protected byte[] engineGetEncoded(String format) throws IOException {
if (format == null || format.equals("ASN.1")) {
return engineGetEncoded();
}
throw new IOException("Unsupported format: " + format);
}
@Override
protected String engineToString() {
return "Conscrypt EC AlgorithmParameters";
}
}