agross-korg commented on a change in pull request #1906: hw/bsp/dialog: Add 
generation of dialog header on images
URL: https://github.com/apache/mynewt-core/pull/1906#discussion_r300786949
 
 

 ##########
 File path: hw/bsp/dialog_da1469x-dk-pro/da1469x_header_tool.py
 ##########
 @@ -0,0 +1,282 @@
+#! /usr/bin/env python3
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+import re
+import click
+import io
+import os.path
+import struct
+import binascii
+import time
+from typing import NamedTuple
+import base64
+
+from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives import serialization
+
+from cryptography.hazmat.primitives import hashes
+
+# Add in patch to mcuboot.  This is required to pull in keys module from 
imgtool
+import sys
+sys.path.append(os.getcwd() + "/repos/mcuboot/scripts/imgtool")
+import keys as keys
+
+class product_header(NamedTuple):
+    ident: bytes
+    active_addr: int
+    update_addr: int
+    cmda_reg: int
+    cmdb_reg: int
+    flash_ident: bytes
+    flash_length: int
+    cmd_seq: bytes
+
+class key_revocation_entry(NamedTuple):
+    key_type: int
+    key_index: int
+
+class revocation_section(NamedTuple):
+    ident: bytes
+    length: int
+
+class device_administration_section(NamedTuple):
+    ident: bytes
+    length: int
+
+class signature_section(NamedTuple):
+    sig_idx: int
+    enc_idx: int
+    nonce: bytes
+    ident: bytes
+    length: int
+    signature: bytes
+
+class security_section(NamedTuple):
+    ident: bytes
+    length: int
+
+class fw_header(NamedTuple):
+    ident: bytes
+    length: int
+    crc: int
+    version: bytes
+    timestamp: int
+    ivt_offset: int
+
+def crc16(data : bytearray, offset , length):
+    if data is None or offset < 0 or offset > len(data)- 1 and offset+length > 
len(data):
+        return 0
+    crc = 0xFFFF
+    for i in range(0, length):
+        crc ^= data[offset + i] << 8
+        for j in range(0,8):
+            if (crc & 0x8000) > 0:
+                crc =(crc << 1) ^ 0x1021
+            else:
+                crc = crc << 1
+    return crc & 0xFFFF
+
+class da1469x_fw_image(object):
+
+    def __init__(self, path, encrypt_file, sig_file, sig_slot, decrypt_slot,
+                 revoke, version):
+        header = product_header(b'Pp', 0x2000, 0x2000, 0xa8a500eb, 0x66,
+                            b'\xaa\x11', 3, b'\x01\x40\07')
+        self.img = struct.pack('<2sIIII2sH3s', *header)
+        self.img += struct.pack('<H', crc16(self.img, 0, len(self.img)))
+        self.img += b'\xff'*(4096*2 - len(self.img))
+
+        self.img_size = os.path.getsize(path)
+        self.aes_key = None
+        self.sig_key = None
+        self.sig_slot = None
+        self.decrypt_slot = None
+        self.revocation_list = revoke
+
+        if version:
+            self.version = version.encode()
+        else:
+            self.version = b'\x00'*16
 
 Review comment:
   fixed

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