Merge pull request #38 from ansforge/bug/35_fix_sha256_transcription_…

…code_for_00_to_0F_bytes

FIX : use String.format to get the byte two-digit hexadecimel format right.

src/main/java/fr/ans/psc/pscextract/service/TransformationService.java

@@ -376,8 +376,7 @@ private void writeDigestEntry(final ZipOutputStream zos, MessageDigest extractEn
     zos.putNextEntry(digestEntry);
     byte[] hash = extractEntryDigester.digest();
     for(int i=0;i<hash.length;i++){
-      Integer currentByte = Byte.toUnsignedInt(hash[i]);
-      zos.write(Integer.toHexString(currentByte).getBytes());
+      zos.write(String.format("%02x",hash[i]).getBytes());
     }
     zos.closeEntry();
   }