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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/security/jce/sig/DSSParameters.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/security/jce/sig/DSSParameters.java | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/security/jce/sig/DSSParameters.java b/gcc-4.4.3/libjava/classpath/gnu/java/security/jce/sig/DSSParameters.java new file mode 100644 index 000000000..8a1cb4ca5 --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/security/jce/sig/DSSParameters.java @@ -0,0 +1,220 @@ +/* DSSParameters.java -- DSS 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.java.security.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.DSAParameterSpec; +import java.security.spec.InvalidParameterSpecException; +import java.util.ArrayList; + +/** + * A JCE-specific Data Access Object (DAO) for DSS parameters. + */ +public class DSSParameters + extends AlgorithmParametersSpi +{ + /** + * A prime modulus, where <code>2<sup>L-1</sup> < p < 2<sup>L</sup></code> + * for <code>512 <= L <= 1024</code> and <code>L</code> a multiple of + * <code>64</code>. + */ + private BigInteger p; + + /** + * A prime divisor of <code>p - 1</code>, where <code>2<sup>159</sup> < q + * < 2<sup>160</sup></code>. + */ + private BigInteger q; + + /** + * <code>g = h<sup>(p-1)</sup>/q mod p</code>, where <code>h</code> is any + * integer with <code>1 < h < p - 1</code> such that <code>h<sup> + * (p-1)</sup>/q mod p > 1</code> (<code>g</code> has order <code>q mod p + * </code>). + */ + private BigInteger g; + + // default 0-arguments constructor + + protected void engineInit(AlgorithmParameterSpec spec) + throws InvalidParameterSpecException + { + if (! (spec instanceof DSAParameterSpec)) + throw new InvalidParameterSpecException("Wrong AlgorithmParameterSpec type: " + + spec.getClass().getName()); + DSAParameterSpec dsaSpec = (DSAParameterSpec) spec; + p = dsaSpec.getP(); + q = dsaSpec.getQ(); + g = dsaSpec.getG(); + } + + /** + * Decodes the set of DSS parameters as per RFC-2459; i.e. the DER-encoded + * form of the following ASN.1 construct: + * + * <pre> + * DssParams ::= SEQUENCE { + * p INTEGER, + * q INTEGER, + * g INTEGER + * } + * </pre> + */ + protected void engineInit(byte[] params) throws IOException + { + DERReader der = new DERReader(params); + + DERValue derParams = der.read(); + DerUtil.checkIsConstructed(derParams, "Wrong DSS Parameters field"); + + DERValue val = der.read(); + DerUtil.checkIsBigInteger(val, "Wrong P field"); + p = (BigInteger) val.getValue(); + val = der.read(); + DerUtil.checkIsBigInteger(val, "Wrong Q field"); + q = (BigInteger) val.getValue(); + val = der.read(); + DerUtil.checkIsBigInteger(val, "Wrong G field"); + g = (BigInteger) val.getValue(); + } + + 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(DSAParameterSpec.class)) + throw new InvalidParameterSpecException("Wrong AlgorithmParameterSpec type: " + + paramSpec.getName()); + return new DSAParameterSpec(p, q, g); + } + + /** + * Encodes the set of DSS parameters as per RFC-2459; i.e. as the DER-encoded + * form of the following ASN.1 construct: + * + * <pre> + * DssParams ::= SEQUENCE { + * p INTEGER, + * q INTEGER, + * g INTEGER + * } + * </pre> + */ + protected byte[] engineGetEncoded() throws IOException + { + DERValue derP = new DERValue(DER.INTEGER, p); + DERValue derQ = new DERValue(DER.INTEGER, q); + DERValue derG = new DERValue(DER.INTEGER, g); + + ArrayList params = new ArrayList(3); + params.add(derP); + params.add(derQ); + params.add(derG); + 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(", q="); + if (q == null) + sb.append("???"); + else + sb.append("0x").append(q.toString(16)); + + sb.append(", g="); + if (g == null) + sb.append("???"); + else + sb.append("0x").append(g.toString(16)); + + return sb.toString(); + } +} |