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/*
* Copyright (C) 2015 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 android.security.keystore2;
import android.annotation.NonNull;
import android.security.KeyStoreSecurityLevel;
import android.security.keystore.KeyProperties;
import android.system.keystore2.KeyDescriptor;
import android.system.keystore2.KeyMetadata;
import java.math.BigInteger;
import java.security.interfaces.RSAPublicKey;
/**
* {@link RSAPublicKey} backed by Android Keystore.
*
* @hide
*/
public class AndroidKeyStoreRSAPublicKey extends AndroidKeyStorePublicKey implements RSAPublicKey {
private final BigInteger mModulus;
private final BigInteger mPublicExponent;
public AndroidKeyStoreRSAPublicKey(@NonNull KeyDescriptor descriptor,
@NonNull KeyMetadata metadata,
@NonNull byte[] x509EncodedForm,
@NonNull KeyStoreSecurityLevel securityLevel, @NonNull BigInteger modulus,
@NonNull BigInteger publicExponent) {
super(descriptor, metadata, x509EncodedForm, KeyProperties.KEY_ALGORITHM_RSA,
securityLevel);
mModulus = modulus;
mPublicExponent = publicExponent;
}
public AndroidKeyStoreRSAPublicKey(@NonNull KeyDescriptor descriptor,
@NonNull KeyMetadata metadata,
@NonNull KeyStoreSecurityLevel securityLevel, @NonNull RSAPublicKey info) {
this(descriptor, metadata, info.getEncoded(), securityLevel, info.getModulus(),
info.getPublicExponent());
if (!"X.509".equalsIgnoreCase(info.getFormat())) {
throw new IllegalArgumentException(
"Unsupported key export format: " + info.getFormat());
}
}
@Override
public AndroidKeyStorePrivateKey getPrivateKey() {
return new AndroidKeyStoreRSAPrivateKey(getUserKeyDescriptor(), getKeyIdDescriptor().nspace,
getAuthorizations(), getSecurityLevel(), mModulus);
}
@Override
public BigInteger getModulus() {
return mModulus;
}
@Override
public BigInteger getPublicExponent() {
return mPublicExponent;
}
}
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