mirror of git://gcc.gnu.org/git/gcc.git
384 lines
15 KiB
Java
384 lines
15 KiB
Java
/* DSSKeyPairGenerator.java --
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Copyright 2001, 2002, 2003, 2006, 2010 Free Software Foundation, Inc.
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This file is a part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.security.key.dss;
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import gnu.java.security.Configuration;
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import gnu.java.security.Registry;
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import gnu.java.security.hash.Sha160;
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import gnu.java.security.key.IKeyPairGenerator;
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import gnu.java.security.util.PRNG;
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import java.math.BigInteger;
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import java.security.KeyPair;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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import java.security.SecureRandom;
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import java.security.spec.DSAParameterSpec;
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import java.util.Map;
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import java.util.logging.Logger;
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/**
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* A key-pair generator for asymetric keys to use in conjunction with the DSS
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* (Digital Signature Standard).
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* <p>
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* References:
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* <p>
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* <a href="http://www.itl.nist.gov/fipspubs/fip186.htm">Digital Signature
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* Standard (DSS)</a>, Federal Information Processing Standards Publication
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* 186. National Institute of Standards and Technology.
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*/
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public class DSSKeyPairGenerator
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implements IKeyPairGenerator
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{
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private static final Logger log = Configuration.DEBUG ?
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Logger.getLogger(DSSKeyPairGenerator.class.getName()) : null;
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/** The BigInteger constant 2. */
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private static final BigInteger TWO = BigInteger.valueOf(2L);
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/** Property name of the length (Integer) of the modulus (p) of a DSS key. */
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public static final String MODULUS_LENGTH = "gnu.crypto.dss.L";
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/**
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* Property name of the Boolean indicating wether or not to use default pre-
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* computed values of <code>p</code>, <code>q</code> and <code>g</code>
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* for a given modulus length. The ultimate behaviour of this generator with
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* regard to using pre-computed parameter sets will depend on the value of
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* this property and of the following one {@link #STRICT_DEFAULTS}:
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* <ol>
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* <li>If this property is {@link Boolean#FALSE} then this generator will
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* accept being setup for generating parameters for any modulus length
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* provided the modulus length is between <code>512</code> and
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* <code>1024</code>, and is of the form <code>512 + 64 * n</code>. In
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* addition, a new paramter set will always be generated; i.e. no pre-
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* computed values are used.</li>
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* <li>If this property is {@link Boolean#TRUE} and the value of
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* {@link #STRICT_DEFAULTS} is also {@link Boolean#TRUE} then this generator
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* will only accept being setup for generating parameters for modulus lengths
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* of <code>512</code>, <code>768</code> and <code>1024</code>. Any
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* other value, of the modulus length, even if between <code>512</code> and
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* <code>1024</code>, and of the form <code>512 + 64 * n</code>, will
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* cause an {@link IllegalArgumentException} to be thrown. When those modulus
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* length (<code>512</code>, <code>768</code>, and <code>1024</code>)
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* are specified, the paramter set is always the same.</li>
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* <li>Finally, if this property is {@link Boolean#TRUE} and the value of
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* {@link #STRICT_DEFAULTS} is {@link Boolean#FALSE} then this generator will
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* behave as in point 1 above, except that it will use pre-computed values
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* when possible; i.e. the modulus length is one of <code>512</code>,
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* <code>768</code>, or <code>1024</code>.</li>
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* </ol>
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* The default value of this property is {@link Boolean#TRUE}.
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*/
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public static final String USE_DEFAULTS = "gnu.crypto.dss.use.defaults";
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/**
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* Property name of the Boolean indicating wether or not to generate new
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* parameters, even if the modulus length <i>L</i> is not one of the pre-
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* computed defaults (value {@link Boolean#FALSE}), or throw an exception
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* (value {@link Boolean#TRUE}) -- the exception in this case is an
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* {@link IllegalArgumentException}. The default value for this property is
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* {@link Boolean#FALSE}. The ultimate behaviour of this generator will
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* depend on the values of this and {@link #USE_DEFAULTS} properties -- see
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* {@link #USE_DEFAULTS} for more information.
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*/
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public static final String STRICT_DEFAULTS = "gnu.crypto.dss.strict.defaults";
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/**
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* Property name of an optional {@link SecureRandom} instance to use. The
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* default is to use a classloader singleton from {@link PRNG}.
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*/
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public static final String SOURCE_OF_RANDOMNESS = "gnu.crypto.dss.prng";
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/**
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* Property name of an optional {@link DSAParameterSpec} instance to use for
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* this generator's <code>p</code>, <code>q</code>, and <code>g</code>
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* values. The default is to generate these values or use pre-computed ones,
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* depending on the value of the <code>USE_DEFAULTS</code> attribute.
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*/
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public static final String DSS_PARAMETERS = "gnu.crypto.dss.params";
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/**
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* Property name of the preferred encoding format to use when externalizing
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* generated instance of key-pairs from this generator. The property is taken
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* to be an {@link Integer} that encapsulates an encoding format identifier.
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*/
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public static final String PREFERRED_ENCODING_FORMAT = "gnu.crypto.dss.encoding";
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/** Default value for the modulus length. */
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public static final int DEFAULT_MODULUS_LENGTH = 1024;
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/** Default encoding format to use when none was specified. */
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private static final int DEFAULT_ENCODING_FORMAT = Registry.RAW_ENCODING_ID;
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/** Initial SHS context. */
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private static final int[] T_SHS = new int[] {
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0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0
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};
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// from jdk1.3.1/docs/guide/security/CryptoSpec.html#AppB
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public static final DSAParameterSpec KEY_PARAMS_512 = new DSAParameterSpec(
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new BigInteger(
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"fca682ce8e12caba26efccf7110e526db078b05edecbcd1eb4a208f3ae1617ae"
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+ "01f35b91a47e6df63413c5e12ed0899bcd132acd50d99151bdc43ee737592e17", 16),
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new BigInteger("962eddcc369cba8ebb260ee6b6a126d9346e38c5", 16),
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new BigInteger(
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"678471b27a9cf44ee91a49c5147db1a9aaf244f05a434d6486931d2d14271b9e"
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+ "35030b71fd73da179069b32e2935630e1c2062354d0da20a6c416e50be794ca4", 16));
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public static final DSAParameterSpec KEY_PARAMS_768 = new DSAParameterSpec(
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new BigInteger(
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"e9e642599d355f37c97ffd3567120b8e25c9cd43e927b3a9670fbec5d8901419"
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+ "22d2c3b3ad2480093799869d1e846aab49fab0ad26d2ce6a22219d470bce7d77"
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+ "7d4a21fbe9c270b57f607002f3cef8393694cf45ee3688c11a8c56ab127a3daf", 16),
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new BigInteger("9cdbd84c9f1ac2f38d0f80f42ab952e7338bf511", 16),
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new BigInteger(
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"30470ad5a005fb14ce2d9dcd87e38bc7d1b1c5facbaecbe95f190aa7a31d23c4"
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+ "dbbcbe06174544401a5b2c020965d8c2bd2171d3668445771f74ba084d2029d8"
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+ "3c1c158547f3a9f1a2715be23d51ae4d3e5a1f6a7064f316933a346d3f529252", 16));
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public static final DSAParameterSpec KEY_PARAMS_1024 = new DSAParameterSpec(
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new BigInteger(
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"fd7f53811d75122952df4a9c2eece4e7f611b7523cef4400c31e3f80b6512669"
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+ "455d402251fb593d8d58fabfc5f5ba30f6cb9b556cd7813b801d346ff26660b7"
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+ "6b9950a5a49f9fe8047b1022c24fbba9d7feb7c61bf83b57e7c6a8a6150f04fb"
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+ "83f6d3c51ec3023554135a169132f675f3ae2b61d72aeff22203199dd14801c7", 16),
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new BigInteger("9760508f15230bccb292b982a2eb840bf0581cf5", 16),
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new BigInteger(
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"f7e1a085d69b3ddecbbcab5c36b857b97994afbbfa3aea82f9574c0b3d078267"
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+ "5159578ebad4594fe67107108180b449167123e84c281613b7cf09328cc8a6e1"
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+ "3c167a8b547c8d28e0a3ae1e2bb3a675916ea37f0bfa213562f1fb627a01243b"
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+ "cca4f1bea8519089a883dfe15ae59f06928b665e807b552564014c3bfecf492a", 16));
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private static final BigInteger TWO_POW_160 = TWO.pow(160);
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/** The length of the modulus of DSS keys generated by this instance. */
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private int L;
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/** The optional {@link SecureRandom} instance to use. */
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private SecureRandom rnd = null;
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private BigInteger seed;
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private BigInteger counter;
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private BigInteger p;
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private BigInteger q;
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private BigInteger e;
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private BigInteger g;
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private BigInteger XKEY;
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/** Our default source of randomness. */
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private PRNG prng = null;
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/** Preferred encoding format of generated keys. */
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private int preferredFormat;
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public String name()
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{
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return Registry.DSS_KPG;
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}
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/**
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* Configures this instance.
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*
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* @param attributes the map of name/value pairs to use.
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* @exception IllegalArgumentException if the designated MODULUS_LENGTH value
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* is not greater than 512, less than 1024 and not of the form
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* <code>512 + 64j</code>.
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*/
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public void setup(Map attributes)
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{
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// find out the modulus length
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Integer l = (Integer) attributes.get(MODULUS_LENGTH);
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L = (l == null ? DEFAULT_MODULUS_LENGTH : l.intValue());
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if ((L % 64) != 0 || L < 512 || L > 1024)
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throw new IllegalArgumentException(MODULUS_LENGTH);
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// should we use the default pre-computed params?
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Boolean useDefaults = (Boolean) attributes.get(USE_DEFAULTS);
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if (useDefaults == null)
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useDefaults = Boolean.TRUE;
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Boolean strictDefaults = (Boolean) attributes.get(STRICT_DEFAULTS);
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if (strictDefaults == null)
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strictDefaults = Boolean.FALSE;
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// are we given a set of DSA params or we shall use/generate our own?
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DSAParameterSpec params = (DSAParameterSpec) attributes.get(DSS_PARAMETERS);
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if (params != null)
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{
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p = params.getP();
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q = params.getQ();
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g = params.getG();
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}
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else if (useDefaults.equals(Boolean.TRUE))
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{
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switch (L)
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{
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case 512:
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p = KEY_PARAMS_512.getP();
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q = KEY_PARAMS_512.getQ();
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g = KEY_PARAMS_512.getG();
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break;
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case 768:
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p = KEY_PARAMS_768.getP();
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q = KEY_PARAMS_768.getQ();
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g = KEY_PARAMS_768.getG();
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break;
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case 1024:
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p = KEY_PARAMS_1024.getP();
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q = KEY_PARAMS_1024.getQ();
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g = KEY_PARAMS_1024.getG();
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break;
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default:
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if (strictDefaults.equals(Boolean.TRUE))
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throw new IllegalArgumentException(
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"Does not provide default parameters for " + L
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+ "-bit modulus length");
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else
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{
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p = null;
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q = null;
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g = null;
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}
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}
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}
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else
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{
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p = null;
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q = null;
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g = null;
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}
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// do we have a SecureRandom, or should we use our own?
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rnd = (SecureRandom) attributes.get(SOURCE_OF_RANDOMNESS);
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// what is the preferred encoding format
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Integer formatID = (Integer) attributes.get(PREFERRED_ENCODING_FORMAT);
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preferredFormat = formatID == null ? DEFAULT_ENCODING_FORMAT
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: formatID.intValue();
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// set the seed-key
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byte[] kb = new byte[20]; // we need 160 bits of randomness
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nextRandomBytes(kb);
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XKEY = new BigInteger(1, kb).setBit(159).setBit(0);
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}
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public KeyPair generate()
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{
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if (p == null)
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{
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BigInteger[] params = new FIPS186(L, rnd).generateParameters();
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seed = params[FIPS186.DSA_PARAMS_SEED];
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counter = params[FIPS186.DSA_PARAMS_COUNTER];
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q = params[FIPS186.DSA_PARAMS_Q];
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p = params[FIPS186.DSA_PARAMS_P];
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e = params[FIPS186.DSA_PARAMS_E];
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g = params[FIPS186.DSA_PARAMS_G];
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if (Configuration.DEBUG)
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{
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log.fine("seed: " + seed.toString(16));
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log.fine("counter: " + counter.intValue());
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log.fine("q: " + q.toString(16));
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log.fine("p: " + p.toString(16));
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log.fine("e: " + e.toString(16));
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log.fine("g: " + g.toString(16));
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}
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}
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BigInteger x = nextX();
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BigInteger y = g.modPow(x, p);
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PublicKey pubK = new DSSPublicKey(preferredFormat, p, q, g, y);
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PrivateKey secK = new DSSPrivateKey(preferredFormat, p, q, g, x);
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return new KeyPair(pubK, secK);
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}
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/**
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* This method applies the following algorithm described in 3.1 of FIPS-186:
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* <ol>
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* <li>XSEED = optional user input.</li>
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* <li>XVAL = (XKEY + XSEED) mod 2<sup>b</sup>.</li>
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* <li>x = G(t, XVAL) mod q.</li>
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* <li>XKEY = (1 + XKEY + x) mod 2<sup>b</sup>.</li>
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* </ol>
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* <p>
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* Where <code>b</code> is the length of a secret b-bit seed-key (XKEY).
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* <p>
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* Note that in this implementation, XSEED, the optional user input, is always
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* zero.
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*/
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private synchronized BigInteger nextX()
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{
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byte[] xk = XKEY.toByteArray();
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byte[] in = new byte[64]; // 512-bit block for SHS
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System.arraycopy(xk, 0, in, 0, xk.length);
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int[] H = Sha160.G(T_SHS[0], T_SHS[1], T_SHS[2], T_SHS[3], T_SHS[4], in, 0);
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byte[] h = new byte[20];
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for (int i = 0, j = 0; i < 5; i++)
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{
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h[j++] = (byte)(H[i] >>> 24);
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h[j++] = (byte)(H[i] >>> 16);
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h[j++] = (byte)(H[i] >>> 8);
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h[j++] = (byte) H[i];
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}
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BigInteger result = new BigInteger(1, h).mod(q);
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XKEY = XKEY.add(result).add(BigInteger.ONE).mod(TWO_POW_160);
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return result;
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}
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/**
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* Fills the designated byte array with random data.
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*
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* @param buffer the byte array to fill with random data.
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*/
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private void nextRandomBytes(byte[] buffer)
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{
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if (rnd != null)
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rnd.nextBytes(buffer);
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else
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getDefaultPRNG().nextBytes(buffer);
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}
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private PRNG getDefaultPRNG()
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{
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if (prng == null)
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prng = PRNG.getInstance();
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return prng;
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}
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}
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