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#!/usr/bin/env python
#
# Copyright (c) 2015, 2017, Linaro Limited
#
# SPDX-License-Identifier: BSD-2-Clause
def uuid_parse(s):
from uuid import UUID
return UUID(s)
def int_parse(str):
return int(str, 0)
def get_args():
from argparse import ArgumentParser
parser = ArgumentParser()
parser.add_argument('--uuid', required=True,
type=uuid_parse, help='UUID of TA')
parser.add_argument('--version', type=int_parse, default=0, help='Version')
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 = 1 # SHDR_BOOTSTRAP_TA
algo = 0x70004830 # TEE_ALG_RSASSA_PKCS1_V1_5_SHA256
shdr = struct.pack('<IIIIHH',
magic, img_type, img_size, algo, digest_len, sig_len)
shdr_uuid = args.uuid.bytes
shdr_version = struct.pack('<I', args.version)
h.update(shdr)
h.update(shdr_uuid)
h.update(shdr_version)
h.update(img)
sig = signer.sign(h)
f = open(args.out, 'wb')
f.write(shdr)
f.write(h.digest())
f.write(sig)
f.write(shdr_uuid)
f.write(shdr_version)
f.write(img)
f.close()
if __name__ == "__main__":
main()
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