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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/security/sig/rsa/RSASignatureFactory.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/security/sig/rsa/RSASignatureFactory.java')
-rw-r--r-- | libjava/classpath/gnu/java/security/sig/rsa/RSASignatureFactory.java | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/security/sig/rsa/RSASignatureFactory.java b/libjava/classpath/gnu/java/security/sig/rsa/RSASignatureFactory.java new file mode 100644 index 000000000..ba5121b46 --- /dev/null +++ b/libjava/classpath/gnu/java/security/sig/rsa/RSASignatureFactory.java @@ -0,0 +1,176 @@ +/* RSASignatureFactory.java -- A Factory class to instantiate RSA Signatures + 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.rsa; + +import java.util.Collections; +import java.util.HashSet; +import java.util.Iterator; +import java.util.Set; + +import gnu.java.security.Registry; +import gnu.java.security.hash.HashFactory; +import gnu.java.security.hash.IMessageDigest; +import gnu.java.security.sig.ISignature; + +/** + * A Factory class to instantiate RSA Signature classes. + */ +public class RSASignatureFactory +{ + private static Set names; + + /** + * Private constructor to enforce usage through Factory (class) methods. + */ + private RSASignatureFactory() + { + super(); + } + + /** + * Returns a new instance of an RSA Signature given its name. The name of an + * RSA Signature always starts with <code>rsa-</code>, followed by either + * <code>pss</code> or <code>pkcs1_v1.5</code>. An optional message digest + * name, to be used with the RSA signature may be specified by appending the + * hyphen chanaracter <code>-</code> followed by the canonical message digest + * algorithm name. When no message digest algorithm name is given, SHA-160 is + * used. + * + * @param name the composite RSA signature name. + * @return a new instance of an RSA Signature algorithm implementation. + * Returns <code>null</code> if the given name does not correspond to any + * supported RSA Signature encoding and message digest combination. + */ + public static final ISignature getInstance(String name) + { + if (name == null) + return null; + + name = name.trim(); + if (name.length() == 0) + return null; + + name = name.toLowerCase(); + if (! name.startsWith(Registry.RSA_SIG_PREFIX)) + return null; + + name = name.substring(Registry.RSA_SIG_PREFIX.length()).trim(); + if (name.startsWith(Registry.RSA_PSS_ENCODING)) + return getPSSSignature(name); + else if (name.startsWith(Registry.RSA_PKCS1_V1_5_ENCODING)) + return getPKCS1Signature(name); + else + return null; + } + + /** + * Returns a {@link Set} of names of <i>RSA</i> signatures supported by this + * <i>Factory</i>. + * + * @return a {@link Set} of RSA Signature algorithm names (Strings). + */ + public static synchronized final Set getNames() + { + if (names == null) + { + Set hashNames = HashFactory.getNames(); + HashSet hs = new HashSet(); + for (Iterator it = hashNames.iterator(); it.hasNext();) + { + String mdName = (String) it.next(); + hs.add(Registry.RSA_PSS_SIG + "-" + mdName); + } + + hs.add(Registry.RSA_PKCS1_V1_5_SIG + "-" + Registry.MD2_HASH); + hs.add(Registry.RSA_PKCS1_V1_5_SIG + "-" + Registry.MD5_HASH); + hs.add(Registry.RSA_PKCS1_V1_5_SIG + "-" + Registry.SHA160_HASH); + hs.add(Registry.RSA_PKCS1_V1_5_SIG + "-" + Registry.SHA256_HASH); + hs.add(Registry.RSA_PKCS1_V1_5_SIG + "-" + Registry.SHA384_HASH); + hs.add(Registry.RSA_PKCS1_V1_5_SIG + "-" + Registry.SHA512_HASH); + + names = Collections.unmodifiableSet(hs); + } + + return names; + } + + private static final ISignature getPSSSignature(String name) + { + name = name.substring(Registry.RSA_PSS_ENCODING.length()).trim(); + // remove the hyphen if found at the beginning + if (name.startsWith("-")) + name = name.substring(1).trim(); + + IMessageDigest md; + if (name.length() == 0) + md = HashFactory.getInstance(Registry.SHA160_HASH); + else + { + // check if there is such a hash + md = HashFactory.getInstance(name); + if (md == null) + return null; + } + + ISignature result = new RSAPSSSignature(md, 0); + return result; + } + + private static final ISignature getPKCS1Signature(String name) + { + name = name.substring(Registry.RSA_PKCS1_V1_5_ENCODING.length()).trim(); + // remove the hyphen if found at the beginning + if (name.startsWith("-")) + name = name.substring(1).trim(); + + IMessageDigest md; + if (name.length() == 0) + md = HashFactory.getInstance(Registry.SHA160_HASH); + else + { + // check if there is such a hash + md = HashFactory.getInstance(name); + if (md == null) + return null; + } + + ISignature result = new RSAPKCS1V1_5Signature(md); + return result; + } +} |