diff --git a/scripts/zep2newt.py b/scripts/zep2newt.py
new file mode 100755
index 0000000..1b46465
--- /dev/null
+++ b/scripts/zep2newt.py
@@ -0,0 +1,220 @@
+#!/usr/bin/python2
+
+from __future__ import print_function
+
+import mmap
+import os
+import struct
+import sys
+from argparse import ArgumentParser
+import newtimg
+from ctypes import *
+from Crypto.Signature import PKCS1_v1_5
+from Crypto.Hash import SHA256
+from Crypto.PublicKey import RSA
+
+DEBUG = False
+
+def get_args():
+    parser = ArgumentParser(description='Script to create images on a format \
+                            that Mynewts bootloader expects')
+
+    parser.add_argument('--bin', required=True, dest='binary_file', \
+                        help='Name of *.bin file (input)')
+
+    parser.add_argument('--key', required=False, dest='key_file', \
+                        help='Name of private key file (*.pem format)')
+
+    parser.add_argument('--out', required=False, dest='image_file', \
+                        default='zephyr.img.bin', \
+                        help='Name of *.img file (output)')
+
+    parser.add_argument('--sig', required=False, dest='sig_type', \
+                        default='SHA256', \
+                        help='Type of signature <SHA256|RSA|EC>')
+
+    parser.add_argument('--off', required=False, dest='flash_offs_addr', \
+                        default='0x08020000', \
+                        help='Offset for the binary in flash (at what address \
+                        should it be flashed?)')
+
+    parser.add_argument('--word-size', required=False, dest='word_size',
+            default=1,
+            help='Writable size of flash device (1, 2, 4, or 8)')
+
+    parser.add_argument('--vtoff', required=False, dest='vtable_offs', \
+                        default=str(hex(newtimg.OFFSET_VECTOR_TABLE)), \
+                        help='Offset to vector table in HEX (default: 0x80)')
+
+    parser.add_argument('--pad', required=False, \
+                        help='Pad file with 0xff up to this size (in hex)')
+
+    parser.add_argument('--bit', required=False, action="store_true", \
+                        default=False, \
+                        help='Whether to add the Boot Image Trailer to the \
+                        padded image or not (default: False)')
+
+    parser.add_argument('--verbose', required=False, action="store_true", \
+                        default=False, \
+                        help='Enable verbose mode')
+
+    parser.add_argument('--version', action='version', version='%(prog)s 1.0')
+
+    parser.add_argument('-f', required=False, action="store_true", \
+                        default=False, \
+                        help='Flash using JLinkExe')
+
+    return parser.parse_args()
+
+def trailer_size(word_size):
+    """
+    Compute the size of the image trailer.
+
+    The image trailer size depends on the writable unit size of the
+    flash in question.  Given a word size of 1, 2, 4 or 8, return the
+    size, in bytes, of the image trailer.  The magic number should be
+    placed at this particular offset from the end of the segment
+    """
+    sizes = { 1: 402, 2: 788, 4: 1560, 8: 3104 }
+    return sizes[word_size]
+
+class Signature(object):
+    """
+    Sign an image appropriately.
+    """
+
+    def compute(self, payload, key_file):
+        # Base computes sha256.
+        ctx = SHA256.new()
+        ctx.update(payload)
+        self.hash = ctx.digest()
+        self.ctx = ctx
+
+    def get_trailer(self):
+        return struct.pack('bxh32s', newtimg.IMAGE_TLV_SHA256,
+                len(self.hash),
+                self.hash)
+
+    def trailer_len(self):
+        return 32 + 4
+
+    def get_flags(self):
+        return newtimg.IMAGE_F_SHA256
+
+class RSASignature(Signature):
+
+    def compute(self, payload, key_file):
+        super(RSASignature, self).compute(payload, key_file)
+        with open(key_file, 'rb') as f:
+            rsa_key = RSA.importKey(f.read())
+        rsa = PKCS1_v1_5.new(rsa_key)
+        self.signature = rsa.sign(self.ctx)
+
+    def trailer_len(self):
+        return super(RSASignature, self).trailer_len() + newtimg.RSA_SIZE
+
+    def get_trailer(self):
+        buf = bytearray(super(RSASignature, self).get_trailer())
+        buf.extend(struct.pack('bxh', newtimg.IMAGE_TLV_RSA2048,
+                newtimg.RSA_SIZE))
+        buf.extend(self.signature)
+        return buf
+
+    def get_flags(self):
+        return newtimg.IMAGE_F_PKCS15_RSA2048_SHA256 | newtimg.IMAGE_F_SHA256
+
+sigs = {
+        'SHA256': Signature,
+        'RSA': RSASignature,
+        }
+
+class Convert():
+    def __init__(self, args):
+        self.args = args
+        if args.verbose:
+            for a in vars(args):
+                print("Arg -> {}: {}".format(a, getattr(args, a)))
+            self.debug = True
+        else:
+            self.debug = False
+
+        self.vtable_offs = int(args.vtable_offs, 16)
+        self.word_size = int(args.word_size)
+
+        self.load_image(args.binary_file)
+        self.validate_header()
+
+        sig = sigs[args.sig_type]()
+        header = self.make_header(sig)
+        assert len(header) == 32
+        self.image[:len(header)] = header
+
+        sig.compute(self.image, args.key_file)
+        self.trailer = sig.get_trailer()
+
+        self.image.extend(self.trailer)
+
+        if args.bit:
+            self.add_trailer(args.pad)
+
+        self.save_image(args.image_file)
+
+    def load_image(self, name):
+        with open(name, 'rb') as f:
+            image = f.read()
+        self.image = bytearray(image)
+
+    def save_image(self, name):
+        with open(name, 'wb') as f:
+            f.write(self.image)
+
+    def validate_header(self):
+        """Ensure that the image has space for a header
+
+        If the image is build with CONFIG_BOOT_HEADER off, the vector
+        table will be at the beginning, rather than the zero padding.
+        Verify that the padding is present.
+        """
+        if self.image[:self.vtable_offs] != bytearray(self.vtable_offs):
+            raise Exception("Image does not have space for header")
+
+    def make_header(self, sig):
+        image_size = len(self.image) - self.vtable_offs
+        tlv_size = sig.trailer_len()
+        key_id = 0
+        hd = struct.pack('IHBxHxxIIBBHI4x',
+                newtimg.IMAGE_MAGIC,
+                tlv_size,
+                key_id,
+                self.vtable_offs,
+                image_size,
+                sig.get_flags(),
+                1, 0, 0, 0)
+        return hd
+
+    def add_trailer(self, pad):
+        """
+        Add the image trailer, to indicate to the bootloader that this
+        image should be flashed
+        """
+        if not pad:
+            raise Exception("Must specify image length with --pad to use --bit")
+        pad = int(pad, 16)
+
+        if len(self.image) > pad:
+            raise Exception("Image is too large for padding")
+
+        self.image.extend(b'\xFF' * (pad - len(self.image)))
+
+        magic = struct.pack('4I', *newtimg.BOOT_IMG_MAGIC)
+        pos = pad - trailer_size(self.word_size)
+        self.image[pos:pos + len(magic)] = magic
+
+def main(argv):
+    args = get_args()
+    erase = False
+
+    conv = Convert(args)
+
+if __name__ == "__main__":
+    main(sys.argv)