1#!/usr/bin/env python 2# 3# Copyright (c) 2015, Linaro Limited 4# All rights reserved. 5# 6# Redistribution and use in source and binary forms, with or without 7# modification, are permitted provided that the following conditions are met: 8# 9# 1. Redistributions of source code must retain the above copyright notice, 10# this list of conditions and the following disclaimer. 11# 12# 2. Redistributions in binary form must reproduce the above copyright notice, 13# this list of conditions and the following disclaimer in the documentation 14# and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26# POSSIBILITY OF SUCH DAMAGE. 27# 28 29def get_args(): 30 import argparse 31 32 parser = argparse.ArgumentParser() 33 parser.add_argument('--prefix', required=True, \ 34 help='Prefix for the public key exponent and modulus in c file') 35 36 parser.add_argument('--out', required=True, \ 37 help='Name of c file for the public key') 38 39 parser.add_argument('--key', required=True, help='Name of key file') 40 41 return parser.parse_args() 42 43def main(): 44 import array 45 from Crypto.PublicKey import RSA 46 from Crypto.Util.number import long_to_bytes 47 48 args = get_args(); 49 50 f = open(args.key, 'r') 51 key = RSA.importKey(f.read()) 52 f.close 53 54 f = open(args.out, 'w') 55 56 f.write("#include <stdint.h>\n"); 57 f.write("#include <stddef.h>\n\n"); 58 59 f.write("const uint32_t " + args.prefix + "_exponent = " + 60 str(key.publickey().e) + ";\n\n") 61 62 f.write("const uint8_t " + args.prefix + "_modulus[] = {\n") 63 i = 0; 64 for x in array.array("B", long_to_bytes(key.publickey().n)): 65 f.write("0x" + '{0:02x}'.format(x) + ",") 66 i = i + 1; 67 if i % 8 == 0: 68 f.write("\n"); 69 else: 70 f.write(" "); 71 f.write("};\n"); 72 73 f.write("const size_t " + args.prefix + "_modulus_size = sizeof(" + \ 74 args.prefix + "_modulus);\n") 75 76 f.close() 77 78if __name__ == "__main__": 79 main() 80