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#!/usr/bin/env python3
import argparse
import sys
import os.path
import subprocess
from functools import partial
def generate_private_key(out_pem='privateKey.pem'):
subprocess.run(['openssl', 'genrsa', '-out', out_pem, '4096'], check=True)
def generate_public_key(in_pem='privateKey.pem', out_pem='publicKey.pem'):
subprocess.run(['openssl', 'rsa', '-in', in_pem, '-pubout', '-out', out_pem], check=True)
def hexdump(array_type, array_name, length_type, in_pem, out_h):
array_len = 0
print("// Autogenerated hex dump of OpenSSL public key, do not edit", file=out_h)
print("{} {}[] = {{".format(array_type, array_name), file=out_h)
for line in iter(partial(in_pem.read, 16), b''):
array_len += len(line)
l = list(line)
for n, i in enumerate(l):
l[n] = '0x{:02X}'.format(i)
print(" {},".format(", ".join(l)), file=out_h)
print("};", file=out_h)
print("{} {}_len = {};".format(length_type, array_name, array_len), file=out_h)
if __name__ == "__main__":
parser = argparse.ArgumentParser(description='Generate OpenSSL key and hexdump')
parser.add_argument('--private', default='privateKey.pem', type=str, help='Private key input')
parser.add_argument('--public', default='publicKey.pem', type=str, help='Public key input')
parser.add_argument('--output', type=argparse.FileType('wt'), default=sys.stdout, help='Output file')
parser.add_argument('--array-type', type=str, default='const unsigned char', help='Array type')
parser.add_argument('--length-type', type=str, default='const unsigned int', help='Length type')
parser.add_argument('--array-name', type=str, default='a', help='Array name')
args=parser.parse_args()
# check if public key exists
if not os.path.isfile(args.public):
# if there is no private key, generate one
if not os.path.isfile(args.private):
generate_private_key(args.private)
# export public key from private
generate_public_key(args.private, args.public)
with open(args.public, "rb") as public_pem:
hexdump(args.array_type, args.array_name, args.length_type, public_pem, args.output)
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