Add Eboutic user guides and reference examples

doc/Kit_E-transactions_internet_premium_PHP/Exemple.php/SignVer.java

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+package signver;
+
+import java.security.interfaces.RSAPublicKey;
+import java.security.Signature;
+import java.security.KeyFactory;
+import java.security.spec.X509EncodedKeySpec;
+import java.io.FileInputStream;
+import java.io.DataInputStream;
+
+import org.apache.commons.codec.binary.Base64;
+import org.apache.commons.codec.net.URLCodec;
+
+public class SignVer {
+
+    // verification signature RSA des donnees avec cle publique
+
+    private static boolean verify( byte[] dataBytes, byte[] sigBytes, String sigAlg, RSAPublicKey pubKey) throws Exception
+    {
+        Signature sig = Signature.getInstance(sigAlg);
+        sig.initVerify(pubKey);
+        sig.update(dataBytes);
+        return sig.verify(sigBytes);
+    }
+
+    // chargement de la cle AU FORMAT der :
+    // openssl rsa -inform PEM -in pbx_pubkey.pem -outform DER -pubin -out /tmp/pubkey.der
+
+    private static RSAPublicKey getPubKey(String pubKeyFile) throws Exception
+    {
+        FileInputStream fis = new FileInputStream(pubKeyFile);
+        DataInputStream dis = new DataInputStream(fis);
+        byte[] pubKeyBytes = new byte[fis.available()];
+        dis.readFully(pubKeyBytes);
+        fis.close();
+        dis.close();
+        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
+        // extraction cle
+        X509EncodedKeySpec pubSpec = new X509EncodedKeySpec(pubKeyBytes);
+        RSAPublicKey pubKey = (RSAPublicKey) keyFactory.generatePublic(pubSpec);
+        return pubKey;
+     }
+    
+     // exemple de verification de la signature
+    
+     public static void main(String[] unused) throws Exception {
+        
+        String sData = "";          // donnees signees URL encodees
+        String sSig  = "";          // signature Base64 et URL encodee 
+        
+        // decodage ...
+        byte[] dataBytes = URLCodec.decodeUrl(sData.getBytes());
+        byte[] sigBytes = Base64.decodeBase64( URLCodec.decodeUrl(sSig.getBytes()));
+        
+        // lecture de la cle publique       
+        RSAPublicKey pubK = getPubKey("/tmp/pubkey.der");
+
+        // verification signature
+        boolean result = verify(dataBytes, sigBytes, "SHA1withRSA", pubK);
+        
+        // affichage resultat
+        System.out.println("Resultat de la verification de signature : " + result);
+    }
+}