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#!/usr/bin/env python
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (c) 2015, Linaro Limited
#
def get_args():
import argparse
parser = argparse.ArgumentParser()
parser.add_argument(
'--prefix',
required=True,
help='Prefix for the public key exponent and modulus in c file')
parser.add_argument('--out', required=True,
help='Name of c file for the public key')
parser.add_argument('--key', required=True, help='Name of key file')
return parser.parse_args()
def main():
import array
from Crypto.PublicKey import RSA
from Crypto.Util.number import long_to_bytes
args = get_args()
f = open(args.key, 'r')
key = RSA.importKey(f.read())
f.close
f = open(args.out, 'w')
f.write("#include <stdint.h>\n")
f.write("#include <stddef.h>\n\n")
f.write("const uint32_t " + args.prefix + "_exponent = " +
str(key.publickey().e) + ";\n\n")
f.write("const uint8_t " + args.prefix + "_modulus[] = {\n")
i = 0
for x in array.array("B", long_to_bytes(key.publickey().n)):
f.write("0x" + '{0:02x}'.format(x) + ",")
i = i + 1
if i % 8 == 0:
f.write("\n")
else:
f.write(" ")
f.write("};\n")
f.write("const size_t " + args.prefix + "_modulus_size = sizeof(" +
args.prefix + "_modulus);\n")
f.close()
if __name__ == "__main__":
main()
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