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kmitresse
106 lines
3.6 KiB
Java
Executable File
106 lines
3.6 KiB
Java
Executable File
/*
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* Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
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*
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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
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Oracle or the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* 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
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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import java.io.*;
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import java.security.*;
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class GenSig {
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public static void main(String[] args) {
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/* Generate a DSA signature */
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if (args.length != 1) {
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System.out.println("Usage: GenSig nameOfFileToSign");
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}
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else try{
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/* Generate a key pair */
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KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA", "SUN");
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SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN");
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keyGen.initialize(1024, random);
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KeyPair pair = keyGen.generateKeyPair();
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PrivateKey priv = pair.getPrivate();
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PublicKey pub = pair.getPublic();
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/* Create a Signature object and initialize it with the private key */
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Signature dsa = Signature.getInstance("SHA1withDSA", "SUN");
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dsa.initSign(priv);
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/* Update and sign the data */
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FileInputStream fis = new FileInputStream(args[0]);
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BufferedInputStream bufin = new BufferedInputStream(fis);
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byte[] buffer = new byte[1024];
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int len;
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while (bufin.available() != 0) {
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len = bufin.read(buffer);
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dsa.update(buffer, 0, len);
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};
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bufin.close();
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/* Now that all the data to be signed has been read in,
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generate a signature for it */
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byte[] realSig = dsa.sign();
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/* Save the signature in a file */
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FileOutputStream sigfos = new FileOutputStream("sig");
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sigfos.write(realSig);
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sigfos.close();
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/* Save the public key in a file */
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byte[] key = pub.getEncoded();
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FileOutputStream keyfos = new FileOutputStream("suepk");
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keyfos.write(key);
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keyfos.close();
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} catch (Exception e) {
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System.err.println("Caught exception " + e.toString());
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}
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};
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}
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