Fix some sync issues

[jvcard.git] / src / be / nikiroo / jvcard / tui / StringUtils.java

diff --git a/src/be/nikiroo/jvcard/tui/StringUtils.java b/src/be/nikiroo/jvcard/tui/StringUtils.java
index 569b06cf3b60edf4f15587c3d9e80e2baaec81b3..efbce6af8a09027b941f3f1dc58344f5a88aef26 100644 (file)
--- a/src/be/nikiroo/jvcard/tui/StringUtils.java
+++ b/src/be/nikiroo/jvcard/tui/StringUtils.java
@@ -1,5 +1,7 @@
 package be.nikiroo.jvcard.tui;
 
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
 import java.text.Normalizer;
 import java.text.Normalizer.Form;
 import java.text.ParseException;
@@ -170,4 +172,35 @@ public class StringUtils {
                        return -1;
                }
        }
+
+       /**
+        * Return a hash of the given {@link String}.
+        * 
+        * @param input
+        *            the input data
+        * 
+        * @return the hash
+        */
+       static public String getHash(String input) {
+               try {
+                       MessageDigest md = MessageDigest.getInstance("MD5");
+                       md.update(input.getBytes());
+                       byte byteData[] = md.digest();
+
+                       StringBuffer hexString = new StringBuffer();
+                       for (int i = 0; i < byteData.length; i++) {
+                               String hex = Integer.toHexString(0xff & byteData[i]);
+                               if (hex.length() == 1)
+                                       hexString.append('0');
+                               hexString.append(hex);
+                       }
+
+                       return hexString.toString();
+               } catch (NoSuchAlgorithmException e) {
+                       // all JVM most probably have an MD5 implementation, but even if
+                       // not, returning the input is "correct", if inefficient and
+                       // unsecure
+                       return input;
+               }
+       }
 }