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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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.
*
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package com.sun.crypto.provider;
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 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 {
/**
* Construct a public key from its encoding.
*
* @param encodedKey the encoding of a public key.
*
* @param encodedKeyAlgorithm the algorithm the encodedKey is for.
*
* @return a public key constructed from the encodedKey.
*/
private static final PublicKey constructPublicKey(byte[] encodedKey,
String encodedKeyAlgorithm)
throws InvalidKeyException, NoSuchAlgorithmException
{
PublicKey key = null;
try {
KeyFactory keyFactory =
KeyFactory.getInstance(encodedKeyAlgorithm,
SunJCE.getInstance());
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(encodedKey);
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);
X509EncodedKeySpec keySpec =
new X509EncodedKeySpec(encodedKey);
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;
}
/**
* Construct a private key from its encoding.
*
* @param encodedKey the encoding of a private key.
*
* @param encodedKeyAlgorithm the algorithm the wrapped key is for.
*
* @return a private key constructed from the encodedKey.
*/
private static final PrivateKey constructPrivateKey(byte[] encodedKey,
String encodedKeyAlgorithm)
throws InvalidKeyException, NoSuchAlgorithmException
{
PrivateKey key = null;
try {
KeyFactory keyFactory =
KeyFactory.getInstance(encodedKeyAlgorithm,
SunJCE.getInstance());
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(encodedKey);
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);
PKCS8EncodedKeySpec keySpec =
new PKCS8EncodedKeySpec(encodedKey);
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;
}
return key;
}
/**
* Construct a secret key from its encoding.
*
* @param encodedKey the encoding of a secret key.
*
* @param encodedKeyAlgorithm the algorithm the secret key is for.
*
* @return a secret key constructed from the encodedKey.
*/
private static final SecretKey constructSecretKey(byte[] encodedKey,
String encodedKeyAlgorithm)
{
return (new SecretKeySpec(encodedKey, encodedKeyAlgorithm));
}
static final Key constructKey(byte[] encoding, String keyAlgorithm,
int keyType)
throws InvalidKeyException, NoSuchAlgorithmException {
Key result = null;
switch (keyType) {
case Cipher.SECRET_KEY:
result = ConstructKeys.constructSecretKey(encoding,
keyAlgorithm);
break;
case Cipher.PRIVATE_KEY:
result = ConstructKeys.constructPrivateKey(encoding,
keyAlgorithm);
break;
case Cipher.PUBLIC_KEY:
result = ConstructKeys.constructPublicKey(encoding,
keyAlgorithm);
break;
}
return result;
}
}