#!/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('--key', required=True, help='Name of key file')
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parser.add_argument('--in', required=True, dest='inf', \
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help='Name of in file')
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parser.add_argument('--out', required=True, help='Name of out file')
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return parser.parse_args()
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def main():
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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.key, 'rb')
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key = RSA.importKey(f.read())
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f.close()
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f = open(args.inf, 'rb')
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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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img_size = len(img)
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magic = 0x4f545348 # SHDR_MAGIC
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img_type = 0 # SHDR_TA
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algo = 0x70004830 # TEE_ALG_RSASSA_PKCS1_V1_5_SHA256
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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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h.update(shdr)
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h.update(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(img)
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f.close()
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if __name__ == "__main__":
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main()
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