Merge pull request eugenp#7628 from Philippus/patch-1

eric-martin · web-flow · commit cf2d93b4e70c · 2019-09-05T15:44:26.000-05:00
Drop last 4 bytes of computed SHA-1 hash
diff --git a/core-java-modules/core-java/src/main/java/com/baeldung/uuid/UUIDGenerator.java b/core-java-modules/core-java/src/main/java/com/baeldung/uuid/UUIDGenerator.java
@@ -3,6 +3,7 @@
 import java.io.UnsupportedEncodingException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
 import java.util.UUID;
 
 public class UUIDGenerator {
@@ -65,9 +66,9 @@ public static UUID type5UUIDFromBytes(byte[] name) {
         try {
             md = MessageDigest.getInstance("SHA-1");
         } catch (NoSuchAlgorithmException nsae) {
-            throw new InternalError("MD5 not supported", nsae);
+            throw new InternalError("SHA-1 not supported", nsae);
         }
-        byte[] bytes = md.digest(name);
+        byte[] bytes = Arrays.copyOfRange(md.digest(name), 0, 16);
         bytes[6] &= 0x0f; /* clear version        */
         bytes[6] |= 0x50; /* set to version 5     */
         bytes[8] &= 0x3f; /* clear variant        */
