| /* SignatureCodecFactory.java -- Factory to instantiate Signature codecs |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.security.sig; |
| |
| import gnu.java.security.Registry; |
| import gnu.java.security.hash.HashFactory; |
| import gnu.java.security.sig.dss.DSSSignatureRawCodec; |
| import gnu.java.security.sig.dss.DSSSignatureX509Codec; |
| import gnu.java.security.sig.rsa.RSAPKCS1V1_5SignatureRawCodec; |
| import gnu.java.security.sig.rsa.RSAPKCS1V1_5SignatureX509Codec; |
| import gnu.java.security.sig.rsa.RSAPSSSignatureRawCodec; |
| import gnu.java.security.util.FormatUtil; |
| |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Set; |
| |
| /** |
| * A <i>Factory</i> class to instantiate Signature codecs. |
| */ |
| public class SignatureCodecFactory |
| { |
| private static Set names; |
| |
| /** Trivial constructor to enforce Singleton pattern. */ |
| private SignatureCodecFactory() |
| { |
| super(); |
| } |
| |
| /** |
| * Returns the appropriate codec given a composed signature algorithm and an |
| * encoding format. A composed name is formed by the concatenation of the |
| * canonical signature algorithm name, the forward slash character |
| * <code>/</code> and the canonical name of the encoding format. |
| * <p> |
| * When the encoding format name is missing, the Raw encoding format is |
| * assumed. When this is the case the trailing forward slash is discarded from |
| * the name. |
| * |
| * @param name the case-insensitive, possibly composed, signature codec name. |
| * @return an instance of the signaturecodec, or <code>null</code> if none |
| * found. |
| */ |
| public static ISignatureCodec getInstance(String name) |
| { |
| if (name == null) |
| return null; |
| |
| name = name.trim(); |
| if (name.length() == 0) |
| return null; |
| |
| if (name.startsWith("/")) |
| return null; |
| |
| if (name.endsWith("/")) |
| return getInstance(name.substring(0, name.length() - 1), |
| Registry.RAW_ENCODING_ID); |
| |
| int i = name.indexOf("/"); |
| if (i == - 1) |
| return getInstance(name, Registry.RAW_ENCODING_ID); |
| |
| String sigName = name.substring(0, i); |
| String formatName = name.substring(i + 1); |
| return getInstance(sigName, formatName); |
| } |
| |
| /** |
| * Returns an instance of a signature codec given the canonical name of the |
| * signature algorithm, and that of the encoding format. |
| * |
| * @param name the case-insensitive signature algorithm name. |
| * @param format the name of the format to use when encodigng/decoding |
| * signatures generated by the named algorithm. |
| * @return an instance of the signature codec, or <code>null</code> if none |
| * found. |
| */ |
| public static ISignatureCodec getInstance(String name, String format) |
| { |
| int formatID = FormatUtil.getFormatID(format); |
| if (formatID == 0) |
| return null; |
| |
| return getInstance(name, formatID); |
| } |
| |
| /** |
| * Returns an instance of a signature codec given the canonical name of the |
| * signature algorithm, and the identifier of the format to use when |
| * encoding/decoding signatures generated by that algorithm. |
| * |
| * @param name the case-insensitive signature algorithm name. |
| * @param formatID the identifier of the format to use when encoding / |
| * decoding signatures generated by the designated algorithm. |
| * @return an instance of the signature codec, or <code>null</code> if none |
| * found. |
| */ |
| public static ISignatureCodec getInstance(String name, int formatID) |
| { |
| if (name == null) |
| return null; |
| |
| name = name.trim(); |
| switch (formatID) |
| { |
| case Registry.RAW_ENCODING_ID: |
| return getRawCodec(name); |
| case Registry.X509_ENCODING_ID: |
| return getX509Codec(name); |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Returns a {@link Set} of supported signature codec names. |
| * |
| * @return a {@link Set} of the names of supported signature codec (Strings). |
| */ |
| public static synchronized final Set getNames() |
| { |
| if (names == null) |
| { |
| HashSet hs = new HashSet(); |
| hs.add(Registry.DSS_SIG + "/" + Registry.RAW_ENCODING_SHORT_NAME); |
| hs.add(Registry.DSS_SIG + "/" + Registry.X509_ENCODING_SORT_NAME); |
| Set hashNames = HashFactory.getNames(); |
| for (Iterator it = hashNames.iterator(); it.hasNext();) |
| { |
| String mdName = (String) it.next(); |
| String name = Registry.RSA_PKCS1_V1_5_SIG + "-" + mdName; |
| hs.add(name + "/" + Registry.RAW_ENCODING_SHORT_NAME); |
| hs.add(name + "/" + Registry.X509_ENCODING_SORT_NAME); |
| name = Registry.RSA_PSS_SIG + "-" + mdName; |
| hs.add(name + "/" + Registry.RAW_ENCODING_SHORT_NAME); |
| } |
| |
| names = Collections.unmodifiableSet(hs); |
| } |
| |
| return names; |
| } |
| |
| /** |
| * @param name the trimmed name of a signature algorithm. |
| * @return a Raw format codec for the designated signature algorithm, or |
| * <code>null</code> if none exists. |
| */ |
| private static ISignatureCodec getRawCodec(String name) |
| { |
| ISignatureCodec result = null; |
| if (name.equalsIgnoreCase(Registry.DSA_SIG) |
| || name.equalsIgnoreCase(Registry.DSS_SIG)) |
| result = new DSSSignatureRawCodec(); |
| else |
| { |
| name = name.toLowerCase(); |
| if (name.startsWith(Registry.RSA_PKCS1_V1_5_SIG)) |
| result = new RSAPKCS1V1_5SignatureRawCodec(); |
| else if (name.startsWith(Registry.RSA_PSS_SIG)) |
| result = new RSAPSSSignatureRawCodec(); |
| } |
| |
| return result; |
| } |
| |
| /** |
| * @param name the trimmed name of a signature algorithm. |
| * @return a X.509 format codec for the designated signature algorithm, or |
| * <code>null</code> if none exists. |
| */ |
| private static ISignatureCodec getX509Codec(String name) |
| { |
| ISignatureCodec result = null; |
| if (name.equalsIgnoreCase(Registry.DSA_SIG) |
| || name.equalsIgnoreCase(Registry.DSS_SIG)) |
| result = new DSSSignatureX509Codec(); |
| else |
| { |
| name = name.toLowerCase(); |
| if (name.startsWith(Registry.RSA_PKCS1_V1_5_SIG)) |
| result = new RSAPKCS1V1_5SignatureX509Codec(); |
| } |
| |
| return result; |
| } |
| } |