128 lines
3.9 KiB
Python
128 lines
3.9 KiB
Python
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#!/usr/bin/env python
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#
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# Copyright (c) 2015, Linaro Limited
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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def get_args():
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from argparse import ArgumentParser
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parser = ArgumentParser()
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parser.add_argument('--nkey', required=True, help='Name of new key file')
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parser.add_argument('--vendor', required=False, action='store_true')
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parser.add_argument('--passphrase', required=False, help='Passphrase of key file')
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parser.add_argument('--in', required=True, dest='inf', \
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help='Name of old signed file')
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parser.add_argument('--out', required=True, help='Name of new signed file')
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return parser.parse_args()
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def main():
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import platform
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import os
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import sys
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print platform.python_version()
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print 'os.getcwd():', os.getcwd()
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print 'os.path.abspath(os.curdir):', os.path.abspath(os.curdir)
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print "os.path.abspath('.'):", os.path.abspath('.')
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print 'sys.path[0]:', sys.path[0]
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print 'sys.argv[0]:', sys.argv[0]
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from Crypto.Signature import PKCS1_v1_5
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from Crypto.Hash import SHA256
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from Crypto.PublicKey import RSA
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import struct
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args = get_args()
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f = open(args.nkey, 'rb')
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key = RSA.importKey(f.read(), args.passphrase)
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f.close()
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f = open(args.inf, 'rb')
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signed_img = f.read()
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f.close()
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signer = PKCS1_v1_5.new(key)
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h = SHA256.new()
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digest_len = h.digest_size
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sig_len = len(signer.sign(h))
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if len(signed_img) < struct.calcsize('<IIIIHH'):
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print "ERROR: Bad format. Length of signed image must be larger than %d, but get %d\n" % \
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(struct.calcsize('<IIIIHH'), len(signed_img))
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return
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old_shdr = signed_img[:struct.calcsize('<IIIIHH')]
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magic, img_type, img_size, algo, old_digest_len, old_sig_len = struct.unpack('<IIIIHH',
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old_shdr);
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if magic != 0x4f545348:
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# 0x4f545348 = SHDR_MAGIC
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print "Error: Bad format. Expecting magic=0x%x, but get 0x%x" % \
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(0x4f545348, magic)
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return
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# only handle SYS_TA/VENDOR_TA
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if img_type != 0 and img_type != 2:
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# 0 = SHDR_TA
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print ("ERROR: Bad format %d\n" % (img_type))
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return
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if algo != 0x70004830:
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# 0x70004830 = TEE_ALG_RSASSA_PKCS1_V1_5_SHA256
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print "ERROR: Bad format. Expecting algo=0x%x, but get 0x%x\n" % \
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(0x70004830, algo)
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return
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if args.vendor:
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print "Signing as a vendor TA"
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img_type = 2
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shdr = struct.pack('<IIIIHH',
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magic, img_type, img_size, algo, digest_len, sig_len)
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raw_img = signed_img[len(shdr) + digest_len + sig_len:]
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if len(raw_img) != img_size:
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print "ERROR: Bad format. Expecting image_size=%d, but get %d\n" % \
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(img_size, len(raw_img))
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h.update(shdr)
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h.update(raw_img)
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sig = signer.sign(h)
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f = open(args.out, 'wb')
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f.write(shdr)
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f.write(h.digest())
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f.write(sig)
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f.write(raw_img)
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f.close()
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if __name__ == "__main__":
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main()
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