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kmitresse
100 lines
3.5 KiB
Java
Executable File
100 lines
3.5 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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import java.security.spec.*;
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class VerSig {
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public static void main(String[] args) {
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/* Verify a DSA signature */
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if (args.length != 3) {
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System.out.println("Usage: VerSig publickeyfile signaturefile datafile");
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}
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else try{
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/* import encoded public key */
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FileInputStream keyfis = new FileInputStream(args[0]);
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byte[] encKey = new byte[keyfis.available()];
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keyfis.read(encKey);
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keyfis.close();
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X509EncodedKeySpec pubKeySpec = new X509EncodedKeySpec(encKey);
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KeyFactory keyFactory = KeyFactory.getInstance("DSA", "SUN");
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PublicKey pubKey = keyFactory.generatePublic(pubKeySpec);
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/* input the signature bytes */
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FileInputStream sigfis = new FileInputStream(args[1]);
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byte[] sigToVerify = new byte[sigfis.available()];
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sigfis.read(sigToVerify );
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sigfis.close();
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/* create a Signature object and initialize it with the public key */
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Signature sig = Signature.getInstance("SHA1withDSA", "SUN");
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sig.initVerify(pubKey);
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/* Update and verify the data */
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FileInputStream datafis = new FileInputStream(args[2]);
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BufferedInputStream bufin = new BufferedInputStream(datafis);
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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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sig.update(buffer, 0, len);
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};
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bufin.close();
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boolean verifies = sig.verify(sigToVerify);
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System.out.println("signature verifies: " + verifies);
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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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