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/* GnuRSAPrivateKey.java -- GNU RSA private key.
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Copyright (C) 2004 Free Software Foundation, Inc.
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This file is 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, or (at your option)
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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; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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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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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.provider;
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import gnu.java.security.OID;
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import gnu.java.security.der.DER;
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import gnu.java.security.der.DERValue;
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import java.math.BigInteger;
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import java.security.interfaces.RSAPrivateCrtKey;
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import java.security.spec.RSAPrivateCrtKeySpec;
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import java.util.ArrayList;
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class GnuRSAPrivateKey implements RSAPrivateCrtKey
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// -------------------------------------------------------------------------
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private final RSAPrivateCrtKeySpec spec;
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private byte[] encodedKey;
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// -------------------------------------------------------------------------
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public GnuRSAPrivateKey(RSAPrivateCrtKeySpec spec)
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// -------------------------------------------------------------------------
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public BigInteger getModulus()
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return spec.getModulus();
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public BigInteger getPrivateExponent()
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return spec.getPrivateExponent();
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public BigInteger getCrtCoefficient()
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return spec.getCrtCoefficient();
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public BigInteger getPrimeExponentP()
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return spec.getPrimeExponentP();
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public BigInteger getPrimeExponentQ()
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return spec.getPrimeExponentQ();
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public BigInteger getPrimeP()
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return spec.getPrimeP();
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public BigInteger getPrimeQ()
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return spec.getPrimeQ();
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public BigInteger getPublicExponent()
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return spec.getPublicExponent();
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public String getAlgorithm()
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public String getFormat()
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* The encoded form is:
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* RSAPrivateKey ::= SEQUENCE {
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* modulus INTEGER, -- n
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* publicExponent INTEGER, -- e
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* privateExponent INTEGER, -- d
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* prime1 INTEGER, -- p
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* prime2 INTEGER, -- q
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* exponent1 INTEGER, -- d mod (p-1)
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* exponent2 INTEGER, -- d mod (q-1)
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* coefficient INTEGER -- (inverse of q) mod p }
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* <p>Which is in turn encoded in a PrivateKeyInfo structure from PKCS#8.
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public byte[] getEncoded()
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if (encodedKey != null)
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return (byte[]) encodedKey.clone();
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ArrayList key = new ArrayList(9);
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key.add(new DERValue(DER.INTEGER, BigInteger.ZERO));
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key.add(new DERValue(DER.INTEGER, getModulus()));
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key.add(new DERValue(DER.INTEGER, getPublicExponent()));
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key.add(new DERValue(DER.INTEGER, getPrivateExponent()));
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key.add(new DERValue(DER.INTEGER, getPrimeP()));
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key.add(new DERValue(DER.INTEGER, getPrimeQ()));
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key.add(new DERValue(DER.INTEGER, getPrimeExponentP()));
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key.add(new DERValue(DER.INTEGER, getPrimeExponentQ()));
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key.add(new DERValue(DER.INTEGER, getCrtCoefficient()));
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DERValue pk = new DERValue(DER.SEQUENCE|DER.CONSTRUCTED, key);
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ArrayList pki = new ArrayList(3);
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pki.add(new DERValue(DER.INTEGER, BigInteger.ZERO));
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ArrayList alg = new ArrayList(2);
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alg.add(new DERValue(DER.OBJECT_IDENTIFIER,
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new OID("1.2.840.113549.1.1.1")));
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alg.add(new DERValue(DER.NULL, null));
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pki.add(new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, alg));
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pki.add(new DERValue(DER.OCTET_STRING, pk.getEncoded()));
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encodedKey = new DERValue(DER.SEQUENCE|DER.CONSTRUCTED, pki).getEncoded();
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return (byte[]) encodedKey.clone();