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ConstructKeys.java
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ConstructKeys.java
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/*
* Copyright (c) 1999, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.crypto.provider;
import jdk.internal.access.SharedSecrets;
import java.security.Key;
import java.security.PublicKey;
import java.security.PrivateKey;
import java.security.KeyFactory;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.util.Arrays;
import javax.crypto.SecretKey;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
/**
* This class is a helper class which construct key objects
* from encoded keys.
*
* @author Sharon Liu
*
*/
final class ConstructKeys {
private static final PublicKey constructPublicKey(byte[] encodedKey,
int ofs, int len, String encodedKeyAlgorithm)
throws InvalidKeyException, NoSuchAlgorithmException {
PublicKey key = null;
byte[] keyBytes = (ofs == 0 && encodedKey.length == len)
? encodedKey : Arrays.copyOfRange(encodedKey, ofs, ofs + len);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
try {
KeyFactory keyFactory =
KeyFactory.getInstance(encodedKeyAlgorithm,
SunJCE.getInstance());
key = keyFactory.generatePublic(keySpec);
} catch (NoSuchAlgorithmException nsae) {
// Try to see whether there is another
// provider which supports this algorithm
try {
KeyFactory keyFactory =
KeyFactory.getInstance(encodedKeyAlgorithm);
key = keyFactory.generatePublic(keySpec);
} catch (NoSuchAlgorithmException nsae2) {
throw new NoSuchAlgorithmException("No installed providers " +
"can create keys for the " +
encodedKeyAlgorithm +
"algorithm");
} catch (InvalidKeySpecException ikse2) {
InvalidKeyException ike =
new InvalidKeyException("Cannot construct public key");
ike.initCause(ikse2);
throw ike;
}
} catch (InvalidKeySpecException ikse) {
InvalidKeyException ike =
new InvalidKeyException("Cannot construct public key");
ike.initCause(ikse);
throw ike;
}
return key;
}
private static final PrivateKey constructPrivateKey(byte[] encodedKey,
int ofs, int len, String encodedKeyAlgorithm)
throws InvalidKeyException, NoSuchAlgorithmException {
PrivateKey key = null;
byte[] keyBytes = (ofs == 0 && encodedKey.length == len)
? encodedKey : Arrays.copyOfRange(encodedKey, ofs, ofs + len);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
try {
KeyFactory keyFactory =
KeyFactory.getInstance(encodedKeyAlgorithm,
SunJCE.getInstance());
return keyFactory.generatePrivate(keySpec);
} catch (NoSuchAlgorithmException nsae) {
// Try to see whether there is another
// provider which supports this algorithm
try {
KeyFactory keyFactory =
KeyFactory.getInstance(encodedKeyAlgorithm);
key = keyFactory.generatePrivate(keySpec);
} catch (NoSuchAlgorithmException nsae2) {
throw new NoSuchAlgorithmException("No installed providers " +
"can create keys for the " +
encodedKeyAlgorithm +
"algorithm");
} catch (InvalidKeySpecException ikse2) {
InvalidKeyException ike =
new InvalidKeyException("Cannot construct private key");
ike.initCause(ikse2);
throw ike;
}
} catch (InvalidKeySpecException ikse) {
InvalidKeyException ike =
new InvalidKeyException("Cannot construct private key");
ike.initCause(ikse);
throw ike;
} finally {
SharedSecrets.getJavaSecuritySpecAccess().clearEncodedKeySpec(keySpec);
if (keyBytes != encodedKey) {
Arrays.fill(keyBytes, (byte)0);
}
}
return key;
}
private static final SecretKey constructSecretKey(byte[] encodedKey,
int ofs, int len, String encodedKeyAlgorithm) {
return (new SecretKeySpec(encodedKey, ofs, len, encodedKeyAlgorithm));
}
static final Key constructKey(byte[] encoding, String keyAlgorithm,
int keyType) throws InvalidKeyException, NoSuchAlgorithmException {
return constructKey(encoding, 0, encoding.length, keyAlgorithm,
keyType);
}
static final Key constructKey(byte[] encoding, int ofs, int len,
String keyAlgorithm, int keyType)
throws InvalidKeyException, NoSuchAlgorithmException {
return switch (keyType) {
case Cipher.SECRET_KEY -> ConstructKeys.constructSecretKey(
encoding, ofs, len, keyAlgorithm);
case Cipher.PRIVATE_KEY -> ConstructKeys.constructPrivateKey(
encoding, ofs, len, keyAlgorithm);
case Cipher.PUBLIC_KEY -> ConstructKeys.constructPublicKey(
encoding, ofs, len, keyAlgorithm);
default -> throw new NoSuchAlgorithmException("Unsupported key type");
};
}
}