| /* |
| * Copyright (c) 2012, 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 sun.security.util; |
| |
| import java.security.Key; |
| import java.security.PrivilegedAction; |
| import java.security.AccessController; |
| import java.security.interfaces.ECKey; |
| import java.security.interfaces.RSAKey; |
| import java.security.interfaces.DSAKey; |
| import javax.crypto.SecretKey; |
| import javax.crypto.interfaces.DHKey; |
| |
| /** |
| * A utility class to get key length |
| */ |
| public final class KeyLength { |
| |
| /** |
| * Returns the key size of the given key object in bits. |
| * |
| * @param key the key object, cannot be null |
| * @return the key size of the given key object in bits, or -1 if the |
| * key size is not accessible |
| */ |
| final public static int getKeySize(Key key) { |
| int size = -1; |
| |
| if (key instanceof Length) { |
| try { |
| Length ruler = (Length)key; |
| size = ruler.length(); |
| } catch (UnsupportedOperationException usoe) { |
| // ignore the exception |
| } |
| |
| if (size >= 0) { |
| return size; |
| } |
| } |
| |
| // try to parse the length from key specification |
| if (key instanceof SecretKey) { |
| SecretKey sk = (SecretKey)key; |
| String format = sk.getFormat(); |
| if ("RAW".equals(format) && sk.getEncoded() != null) { |
| size = (sk.getEncoded().length * 8); |
| } // Otherwise, it may be a unextractable key of PKCS#11, or |
| // a key we are not able to handle. |
| } else if (key instanceof RSAKey) { |
| RSAKey pubk = (RSAKey)key; |
| size = pubk.getModulus().bitLength(); |
| } else if (key instanceof ECKey) { |
| ECKey pubk = (ECKey)key; |
| size = pubk.getParams().getOrder().bitLength(); |
| } else if (key instanceof DSAKey) { |
| DSAKey pubk = (DSAKey)key; |
| size = pubk.getParams().getP().bitLength(); |
| } else if (key instanceof DHKey) { |
| DHKey pubk = (DHKey)key; |
| size = pubk.getParams().getP().bitLength(); |
| } // Otherwise, it may be a unextractable key of PKCS#11, or |
| // a key we are not able to handle. |
| |
| return size; |
| } |
| } |
| |