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Viewing changes to contrib/NSch/NSch.Jce/SignatureDSA.cs

  • Committer: Bazaar Package Importer
  • Author(s): Jo Shields
  • Date: 2011-06-27 17:03:13 UTC
  • mto: (1.8.1 upstream)
  • mto: This revision was merged to the branch mainline in revision 54.
  • Revision ID: james.westby@ubuntu.com-20110627170313-6cvz3s19x6e9hqe9
Import upstream version 2.5.92+dfsg

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contrib/NSch/NSch.Jce/SignatureDSA.cs
 
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/*
 
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Copyright (c) 2006-2010 ymnk, JCraft,Inc. All rights reserved.
 
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Redistribution and use in source and binary forms, with or without
 
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modification, are permitted provided that the following conditions are met:
 
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  1. Redistributions of source code must retain the above copyright notice,
 
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     this list of conditions and the following disclaimer.
 
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  2. Redistributions in binary form must reproduce the above copyright 
 
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     notice, this list of conditions and the following disclaimer in 
 
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     the documentation and/or other materials provided with the distribution.
 
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  3. The names of the authors may not be used to endorse or promote products
 
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     derived from this software without specific prior written permission.
 
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
 
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INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
 
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 
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OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
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This code is based on jsch (http://www.jcraft.com/jsch).
 
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All credit should go to the authors of jsch.
 
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*/
 
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using Mono.Math;
 
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using Sharpen;
 
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namespace NSch.Jce
 
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{
 
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        public class SignatureDSA : NSch.SignatureDSA
 
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        {
 
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                internal Signature signature;
 
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                internal KeyFactory keyFactory;
 
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                /// <exception cref="System.Exception"></exception>
 
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                public virtual void Init()
 
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                {
 
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                        signature = Signature.GetInstance("SHA1withDSA");
 
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                        keyFactory = KeyFactory.GetInstance("DSA");
 
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                }
 
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                /// <exception cref="System.Exception"></exception>
 
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                public virtual void SetPubKey(byte[] y, byte[] p, byte[] q, byte[] g)
 
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                {
 
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                        DSAPublicKeySpec dsaPubKeySpec = new DSAPublicKeySpec(new BigInteger(y), new BigInteger
 
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                                (p), new BigInteger(q), new BigInteger(g));
 
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                        PublicKey pubKey = keyFactory.GeneratePublic(dsaPubKeySpec);
 
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                        signature.InitVerify(pubKey);
 
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                }
 
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                /// <exception cref="System.Exception"></exception>
 
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                public virtual void SetPrvKey(byte[] x, byte[] p, byte[] q, byte[] g)
 
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                {
 
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                        DSAPrivateKeySpec dsaPrivKeySpec = new DSAPrivateKeySpec(new BigInteger(x), new BigInteger
 
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                                (p), new BigInteger(q), new BigInteger(g));
 
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                        PrivateKey prvKey = keyFactory.GeneratePrivate(dsaPrivKeySpec);
 
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                        signature.InitSign(prvKey);
 
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                }
 
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                /// <exception cref="System.Exception"></exception>
 
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                public virtual byte[] Sign()
 
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                {
 
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                        return signature.Sign ();
 
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                }
 
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                /// <exception cref="System.Exception"></exception>
 
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                public virtual void Update(byte[] foo)
 
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                {
 
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                        signature.Update(foo);
 
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                }
 
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                /// <exception cref="System.Exception"></exception>
 
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                public virtual bool Verify(byte[] sig)
 
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                {
 
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                        int i = 0;
 
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                        int j = 0;
 
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                        byte[] tmp;
 
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                        if (sig[0] == 0 && sig[1] == 0 && sig[2] == 0)
 
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                        {
 
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                                j = ((sig[i++] << 24) & unchecked((int)(0xff000000))) | ((sig[i++] << 16) & unchecked(
 
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                                        (int)(0x00ff0000))) | ((sig[i++] << 8) & unchecked((int)(0x0000ff00))) | ((sig[i
 
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                                        ++]) & unchecked((int)(0x000000ff)));
 
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                                i += j;
 
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                                j = ((sig[i++] << 24) & unchecked((int)(0xff000000))) | ((sig[i++] << 16) & unchecked(
 
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                                        (int)(0x00ff0000))) | ((sig[i++] << 8) & unchecked((int)(0x0000ff00))) | ((sig[i
 
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                                        ++]) & unchecked((int)(0x000000ff)));
 
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                                tmp = new byte[j];
 
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                                System.Array.Copy(sig, i, tmp, 0, j);
 
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                                sig = tmp;
 
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                        }
 
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                        // ASN.1
 
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                        int frst = ((sig[0] & unchecked((int)(0x80))) != 0 ? 1 : 0);
 
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                        int scnd = ((sig[20] & unchecked((int)(0x80))) != 0 ? 1 : 0);
 
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                        //System.err.println("frst: "+frst+", scnd: "+scnd);
 
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                        int length = sig.Length + 6 + frst + scnd;
 
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                        tmp = new byte[length];
 
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                        tmp[0] = unchecked((byte)unchecked((int)(0x30)));
 
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                        tmp[1] = unchecked((byte)unchecked((int)(0x2c)));
 
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                        tmp[1] += (byte)frst;
 
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                        tmp[1] += (byte)scnd;
 
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                        tmp[2] = unchecked((byte)unchecked((int)(0x02)));
 
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                        tmp[3] = unchecked((byte)unchecked((int)(0x14)));
 
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                        tmp[3] += (byte)frst;
 
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                        System.Array.Copy(sig, 0, tmp, 4 + frst, 20);
 
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                        tmp[4 + tmp[3]] = unchecked((byte)unchecked((int)(0x02)));
 
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                        tmp[5 + tmp[3]] = unchecked((byte)unchecked((int)(0x14)));
 
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                        tmp[5 + tmp[3]] += (byte)scnd;
 
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                        System.Array.Copy(sig, 20, tmp, 6 + tmp[3] + scnd, 20);
 
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                        sig = tmp;
 
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                        return signature.Verify(sig);
 
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                }
 
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        }
 
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}