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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.keystore;
import android.annotation.NonNull;
import android.security.keymaster.KeymasterArguments;
import android.security.keymaster.KeymasterDefs;
import java.security.InvalidKeyException;
import java.security.SignatureSpi;
/**
* Base class for {@link SignatureSpi} providing Android KeyStore backed RSA signatures.
*
* @hide
*/
abstract class AndroidKeyStoreRSASignatureSpi extends AndroidKeyStoreSignatureSpiBase {
abstract static class PKCS1Padding extends AndroidKeyStoreRSASignatureSpi {
PKCS1Padding(int keymasterDigest) {
super(keymasterDigest, KeymasterDefs.KM_PAD_RSA_PKCS1_1_5_SIGN);
}
@Override
protected final int getAdditionalEntropyAmountForSign() {
// No entropy required for this deterministic signature scheme.
return 0;
}
}
public static final class NONEWithPKCS1Padding extends PKCS1Padding {
public NONEWithPKCS1Padding() {
super(KeymasterDefs.KM_DIGEST_NONE);
}
}
public static final class MD5WithPKCS1Padding extends PKCS1Padding {
public MD5WithPKCS1Padding() {
super(KeymasterDefs.KM_DIGEST_MD5);
}
}
public static final class SHA1WithPKCS1Padding extends PKCS1Padding {
public SHA1WithPKCS1Padding() {
super(KeymasterDefs.KM_DIGEST_SHA1);
}
}
public static final class SHA224WithPKCS1Padding extends PKCS1Padding {
public SHA224WithPKCS1Padding() {
super(KeymasterDefs.KM_DIGEST_SHA_2_224);
}
}
public static final class SHA256WithPKCS1Padding extends PKCS1Padding {
public SHA256WithPKCS1Padding() {
super(KeymasterDefs.KM_DIGEST_SHA_2_256);
}
}
public static final class SHA384WithPKCS1Padding extends PKCS1Padding {
public SHA384WithPKCS1Padding() {
super(KeymasterDefs.KM_DIGEST_SHA_2_384);
}
}
public static final class SHA512WithPKCS1Padding extends PKCS1Padding {
public SHA512WithPKCS1Padding() {
super(KeymasterDefs.KM_DIGEST_SHA_2_512);
}
}
abstract static class PSSPadding extends AndroidKeyStoreRSASignatureSpi {
private static final int SALT_LENGTH_BYTES = 20;
PSSPadding(int keymasterDigest) {
super(keymasterDigest, KeymasterDefs.KM_PAD_RSA_PSS);
}
@Override
protected final int getAdditionalEntropyAmountForSign() {
return SALT_LENGTH_BYTES;
}
}
public static final class SHA1WithPSSPadding extends PSSPadding {
public SHA1WithPSSPadding() {
super(KeymasterDefs.KM_DIGEST_SHA1);
}
}
public static final class SHA224WithPSSPadding extends PSSPadding {
public SHA224WithPSSPadding() {
super(KeymasterDefs.KM_DIGEST_SHA_2_224);
}
}
public static final class SHA256WithPSSPadding extends PSSPadding {
public SHA256WithPSSPadding() {
super(KeymasterDefs.KM_DIGEST_SHA_2_256);
}
}
public static final class SHA384WithPSSPadding extends PSSPadding {
public SHA384WithPSSPadding() {
super(KeymasterDefs.KM_DIGEST_SHA_2_384);
}
}
public static final class SHA512WithPSSPadding extends PSSPadding {
public SHA512WithPSSPadding() {
super(KeymasterDefs.KM_DIGEST_SHA_2_512);
}
}
private final int mKeymasterDigest;
private final int mKeymasterPadding;
AndroidKeyStoreRSASignatureSpi(int keymasterDigest, int keymasterPadding) {
mKeymasterDigest = keymasterDigest;
mKeymasterPadding = keymasterPadding;
}
@Override
protected final void initKey(AndroidKeyStoreKey key) throws InvalidKeyException {
if (!KeyProperties.KEY_ALGORITHM_RSA.equalsIgnoreCase(key.getAlgorithm())) {
throw new InvalidKeyException("Unsupported key algorithm: " + key.getAlgorithm()
+ ". Only" + KeyProperties.KEY_ALGORITHM_RSA + " supported");
}
super.initKey(key);
}
@Override
protected final void resetAll() {
super.resetAll();
}
@Override
protected final void resetWhilePreservingInitState() {
super.resetWhilePreservingInitState();
}
@Override
protected final void addAlgorithmSpecificParametersToBegin(
@NonNull KeymasterArguments keymasterArgs) {
keymasterArgs.addInt(KeymasterDefs.KM_TAG_ALGORITHM, KeymasterDefs.KM_ALGORITHM_RSA);
keymasterArgs.addInt(KeymasterDefs.KM_TAG_DIGEST, mKeymasterDigest);
keymasterArgs.addInt(KeymasterDefs.KM_TAG_PADDING, mKeymasterPadding);
}
}
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