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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/security/sig/SignatureCodecFactory.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/security/sig/SignatureCodecFactory.java | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/security/sig/SignatureCodecFactory.java b/gcc-4.4.3/libjava/classpath/gnu/java/security/sig/SignatureCodecFactory.java new file mode 100644 index 000000000..c5b2ccd4b --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/security/sig/SignatureCodecFactory.java @@ -0,0 +1,226 @@ +/* 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; + } +} |