How to use imgtool - 10 common examples

def verify(key, imgfile):
    key = load_key(key) if key else None
    ret, version = image.Image.verify(imgfile, key)
    if ret == image.VerifyResult.OK:
        print("Image was correctly validated")
        print("Image version: {}.{}.{}+{}".format(*version))
        return
    elif ret == image.VerifyResult.INVALID_MAGIC:
        print("Invalid image magic; is this an MCUboot image?")
    elif ret == image.VerifyResult.INVALID_TLV_INFO_MAGIC:
        print("Invalid TLV info magic; is this an MCUboot image?")
    elif ret == image.VerifyResult.INVALID_HASH:
        print("Image has an invalid sha256 digest")
    elif ret == image.VerifyResult.INVALID_SIGNATURE:
        print("No signature found for the given key")
    else:
        print("Unknown return code: {}".format(ret))
    sys.exit(1)

def verify(key, imgfile):
    key = load_key(key) if key else None
    ret, version = image.Image.verify(imgfile, key)
    if ret == image.VerifyResult.OK:
        print("Image was correctly validated")
        print("Image version: {}.{}.{}+{}".format(*version))
        return
    elif ret == image.VerifyResult.INVALID_MAGIC:
        print("Invalid image magic; is this an MCUboot image?")
    elif ret == image.VerifyResult.INVALID_TLV_INFO_MAGIC:
        print("Invalid TLV info magic; is this an MCUboot image?")
    elif ret == image.VerifyResult.INVALID_HASH:
        print("Image has an invalid sha256 digest")
    elif ret == image.VerifyResult.INVALID_SIGNATURE:
        print("No signature found for the given key")
    else:
        print("Unknown return code: {}".format(ret))
    sys.exit(1)

def verify(key, imgfile):
    key = load_key(key) if key else None
    ret, version = image.Image.verify(imgfile, key)
    if ret == image.VerifyResult.OK:
        print("Image was correctly validated")
        print("Image version: {}.{}.{}+{}".format(*version))
        return
    elif ret == image.VerifyResult.INVALID_MAGIC:
        print("Invalid image magic; is this an MCUboot image?")
    elif ret == image.VerifyResult.INVALID_TLV_INFO_MAGIC:
        print("Invalid TLV info magic; is this an MCUboot image?")
    elif ret == image.VerifyResult.INVALID_HASH:
        print("Image has an invalid sha256 digest")
    elif ret == image.VerifyResult.INVALID_SIGNATURE:
        print("No signature found for the given key")
    else:
        print("Unknown return code: {}".format(ret))
    sys.exit(1)

def verify(key, imgfile):
    key = load_key(key) if key else None
    ret, version = image.Image.verify(imgfile, key)
    if ret == image.VerifyResult.OK:
        print("Image was correctly validated")
        print("Image version: {}.{}.{}+{}".format(*version))
        return
    elif ret == image.VerifyResult.INVALID_MAGIC:
        print("Invalid image magic; is this an MCUboot image?")
    elif ret == image.VerifyResult.INVALID_TLV_INFO_MAGIC:
        print("Invalid TLV info magic; is this an MCUboot image?")
    elif ret == image.VerifyResult.INVALID_HASH:
        print("Image has an invalid sha256 digest")
    elif ret == image.VerifyResult.INVALID_SIGNATURE:
        print("No signature found for the given key")
    else:
        print("Unknown return code: {}".format(ret))
    sys.exit(1)

def load_key(keyfile):
    # TODO: better handling of invalid pass-phrase
    key = keys.load(keyfile)
    if key is not None:
        return key
    passwd = getpass.getpass("Enter key passphrase: ").encode('utf-8')
    return keys.load(keyfile, passwd)

def load_key(keyfile):
    # TODO: better handling of invalid pass-phrase
    key = keys.load(keyfile)
    if key is not None:
        return key
    passwd = getpass.getpass("Enter key passphrase: ").encode('utf-8')
    return keys.load(keyfile, passwd)

def load_key(keyfile):
    # TODO: better handling of invalid pass-phrase
    key = keys.load(keyfile)
    if key is not None:
        return key
    passwd = getpass.getpass("Enter key passphrase: ").encode('utf-8')
    return keys.load(keyfile, passwd)

def load_key(keyfile):
    # TODO: better handling of invalid pass-phrase
    key = keys.load(keyfile)
    if key is not None:
        return key
    passwd = getpass.getpass("Enter key passphrase: ").encode('utf-8')
    return keys.load(keyfile, passwd)

def sign(key, align, version, header_size, pad_header, slot_size, pad,
         max_sectors, overwrite_only, endian, encrypt, infile, outfile):
    img = image.Image(version=decode_version(version), header_size=header_size,
                      pad_header=pad_header, pad=pad, align=int(align),
                      slot_size=slot_size, max_sectors=max_sectors,
                      overwrite_only=overwrite_only, endian=endian)
    img.load(infile)
    key = load_key(key) if key else None
    enckey = load_key(encrypt) if encrypt else None
    if enckey:
        if not isinstance(enckey, (keys.RSA2048, keys.RSA2048Public)):
            raise Exception("Encryption only available with RSA")
        if key and not isinstance(key, (keys.RSA2048, keys.RSA2048Public)):
            raise Exception("Encryption with sign only available with RSA")
    img.create(key, enckey)
    img.save(outfile)

def get_dfu_image_version(dfu_image):
    res, ver = img.Image.verify(dfu_image, None)

    if res != img.VerifyResult.OK:
        print('Image in file is invalid')
        return None

    return ver