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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/javax/crypto/jce/sig/DHParameters.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/javax/crypto/jce/sig/DHParameters.java | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/jce/sig/DHParameters.java b/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/jce/sig/DHParameters.java new file mode 100644 index 000000000..a917e2230 --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/jce/sig/DHParameters.java @@ -0,0 +1,222 @@ +/* DHParameters.java -- DH parameters DAO + 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.javax.crypto.jce.sig; + +import gnu.java.lang.CPStringBuilder; + +import gnu.java.security.Registry; +import gnu.java.security.der.DER; +import gnu.java.security.der.DERReader; +import gnu.java.security.der.DERValue; +import gnu.java.security.der.DERWriter; +import gnu.java.security.util.DerUtil; + +import java.io.ByteArrayOutputStream; +import java.io.IOException; +import java.math.BigInteger; +import java.security.AlgorithmParametersSpi; +import java.security.spec.AlgorithmParameterSpec; +import java.security.spec.InvalidParameterSpecException; +import java.util.ArrayList; + +import javax.crypto.spec.DHGenParameterSpec; +import javax.crypto.spec.DHParameterSpec; + +/** + * A JCE-specific Data Access Object (DAO) for DH parameters. + */ +public class DHParameters + extends AlgorithmParametersSpi +{ + /** The prime public modulus. */ + private BigInteger p; + + /** The generator. */ + private BigInteger g; + + /** A prime factor of p-1. */ + private BigInteger q; + + /** The (private) random exponent's size (in bits). */ + private int l; + + // default 0-arguments constructor + + protected void engineInit(AlgorithmParameterSpec spec) + throws InvalidParameterSpecException + { + if (! (spec instanceof DHParameterSpec)) + throw new InvalidParameterSpecException("Wrong AlgorithmParameterSpec type: " + + spec.getClass().getName()); + DHParameterSpec dhSpec = (DHParameterSpec) spec; + p = dhSpec.getP(); + g = dhSpec.getG(); + l = dhSpec.getL(); + } + + /** + * Decodes the set of DH parameters as per RFC-2459; i.e. the DER-encoded + * form of the following ASN.1 construct: + * + * <pre> + * DhParams ::= SEQUENCE { + * p INTEGER, -- odd prime, p=jq +1 + * g INTEGER, -- generator, g + * q INTEGER -- factor of p-1 + * } + * </pre> + */ + protected void engineInit(byte[] params) throws IOException + { + DERReader der = new DERReader(params); + + DERValue derParams = der.read(); + DerUtil.checkIsConstructed(derParams, "Wrong DH Parameters field"); + + DERValue val = der.read(); + DerUtil.checkIsBigInteger(val, "Wrong P field"); + p = (BigInteger) val.getValue(); + val = der.read(); + DerUtil.checkIsBigInteger(val, "Wrong G field"); + g = (BigInteger) val.getValue(); + val = der.read(); + DerUtil.checkIsBigInteger(val, "Wrong Q field"); + q = (BigInteger) val.getValue(); + l = q.bitLength(); + } + + protected void engineInit(byte[] params, String format) throws IOException + { + if (format != null) + { + format = format.trim(); + if (format.length() == 0) + throw new IOException("Format MUST NOT be an empty string"); + + if (! format.equalsIgnoreCase(Registry.ASN1_ENCODING_SHORT_NAME)) + throw new IOException("Unknown or unsupported format: " + format); + } + + engineInit(params); + } + + protected AlgorithmParameterSpec engineGetParameterSpec(Class paramSpec) + throws InvalidParameterSpecException + { + if (paramSpec.isAssignableFrom(DHParameterSpec.class)) + return new DHParameterSpec(p, g, l); + + if (paramSpec.isAssignableFrom(DHGenParameterSpec.class)) + return new DHGenParameterSpec(p.bitLength(), l); + + throw new InvalidParameterSpecException("Wrong AlgorithmParameterSpec type: " + + paramSpec.getName()); + } + + /** + * Encodes the set of DH parameters as per RFC-2459; i.e. as the DER-encoded + * form of the following ASN.1 construct: + * + * <pre> + * DhParams ::= SEQUENCE { + * p INTEGER, -- odd prime, p=jq +1 + * g INTEGER, -- generator, g + * q INTEGER -- factor of p-1 + * } + * </pre> + */ + protected byte[] engineGetEncoded() throws IOException + { + DERValue derP = new DERValue(DER.INTEGER, p); + DERValue derG = new DERValue(DER.INTEGER, g); + DERValue derQ = new DERValue(DER.INTEGER, q); + + ArrayList params = new ArrayList(3); + params.add(derP); + params.add(derG); + params.add(derQ); + DERValue derParams = new DERValue(DER.CONSTRUCTED | DER.SEQUENCE, params); + + ByteArrayOutputStream baos = new ByteArrayOutputStream(); + DERWriter.write(baos, derParams); + byte[] result = baos.toByteArray(); + + return result; + } + + protected byte[] engineGetEncoded(String format) throws IOException + { + if (format != null) + { + format = format.trim(); + if (format.length() == 0) + throw new IOException("Format MUST NOT be an empty string"); + + if (! format.equalsIgnoreCase(Registry.ASN1_ENCODING_SHORT_NAME)) + throw new IOException("Unknown or unsupported format: " + format); + } + + return engineGetEncoded(); + } + + protected String engineToString() + { + CPStringBuilder sb = new CPStringBuilder("p="); + if (p == null) + sb.append("???"); + else + sb.append("0x").append(p.toString(16)); + + sb.append(", g="); + if (g == null) + sb.append("???"); + else + sb.append("0x").append(g.toString(16)); + + sb.append(", q="); + if (q == null) + sb.append("???"); + else + sb.append("0x").append(q.toString(16)); + + sb.append(", l=").append(l); + + return sb.toString(); + } +} |