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#!/usr/bin/env python
#
# Copyright (c) 2015, Linaro Limited
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
def get_args():
from argparse import ArgumentParser
parser = ArgumentParser()
parser.add_argument('--key', required=True, help='Name of key file')
parser.add_argument('--in', required=True, dest='inf', \
help='Name of in file')
parser.add_argument('--out', required=True, help='Name of out file')
return parser.parse_args()
def main():
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA256
from Crypto.PublicKey import RSA
import struct
args = get_args()
f = open(args.key, 'rb')
key = RSA.importKey(f.read())
f.close()
f = open(args.inf, 'rb')
img = f.read()
f.close()
signer = PKCS1_v1_5.new(key)
h = SHA256.new()
digest_len = h.digest_size
sig_len = len(signer.sign(h))
img_size = len(img)
magic = 0x4f545348 # SHDR_MAGIC
img_type = 0 # SHDR_TA
algo = 0x70004830 # TEE_ALG_RSASSA_PKCS1_V1_5_SHA256
shdr = struct.pack('<IIIIHH', \
magic, img_type, img_size, algo, digest_len, sig_len)
h.update(shdr)
h.update(img)
sig = signer.sign(h)
f = open(args.out, 'wb')
f.write(shdr)
f.write(h.digest())
f.write(sig)
f.write(img)
f.close()
if __name__ == "__main__":
main()
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