code: public static MD5Digest fromBytes(byte[] md5Bytes)
    {
      Preconditions.checkArgument(md5Bytes.length == MD5_BYTES_LENGTH,
          "md5 bytes must be " + MD5_BYTES_LENGTH + " bytes in length, found " + md5Bytes.length + " bytes.");
      String md5String = Hex.encodeHexString(md5Bytes);
      return new MD5Digest(md5String, md5Bytes);
    }
docs: Static method to get an MD5Digest from a binary byte representation
  @param md5Bytes
  @return a filled out MD5Digest