[feat] - SSI - TP1

2026-05-13 17:11:53 +00:00 · 2024-10-25 10:05:41 +02:00
parent 77462dd6d2
commit a2e042a9a3
40 changed files with 361 additions and 0 deletions
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   - Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *   - Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ *   - Neither the name of Oracle or the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */ 
+
+
+ import java.io.*;
+ import java.security.*;
+ import java.security.spec.*;
+ 
+ class VerSig {
+ 
+     public static void main(String[] args) {
+ 
+         /* Verify a DSA signature */
+ 
+         if (args.length != 3) {
+             System.out.println("Usage: VerSig publickeyfile signaturefile datafile");
+             }
+         else try{
+ 
+             /* import encoded public key */
+ 
+             FileInputStream keyfis = new FileInputStream(args[0]);
+             byte[] encKey = new byte[keyfis.available()];  
+             keyfis.read(encKey);
+ 
+             keyfis.close();
+ 
+             X509EncodedKeySpec pubKeySpec = new X509EncodedKeySpec(encKey);
+ 
+             KeyFactory keyFactory = KeyFactory.getInstance("DSA", "SUN");
+             PublicKey pubKey = keyFactory.generatePublic(pubKeySpec);
+ 
+             /* input the signature bytes */
+             FileInputStream sigfis = new FileInputStream(args[1]);
+             byte[] sigToVerify = new byte[sigfis.available()]; 
+             sigfis.read(sigToVerify );
+ 
+             sigfis.close();
+ 
+             /* create a Signature object and initialize it with the public key */
+             Signature sig = Signature.getInstance("SHA1withDSA", "SUN");
+             sig.initVerify(pubKey);
+ 
+             /* Update and verify the data */
+ 
+             FileInputStream datafis = new FileInputStream(args[2]);
+             BufferedInputStream bufin = new BufferedInputStream(datafis);
+ 
+             byte[] buffer = new byte[1024];
+             int len;
+             while (bufin.available() != 0) {
+                 len = bufin.read(buffer);
+                 sig.update(buffer, 0, len);
+                 };
+ 
+             bufin.close();
+ 
+ 
+             boolean verifies = sig.verify(sigToVerify);
+ 
+             System.out.println("signature verifies: " + verifies);
+ 
+ 
+         } catch (Exception e) {
+             System.err.println("Caught exception " + e.toString());
+ };
+ 
+     }
+ 
+ }
+ 
+