#### Rsa Key Generator

C
W
c
9
and 2 more contributors
```import os
import random
import sys

from . import cryptomath_module as cryptoMath  # noqa: N812
from . import rabin_miller as rabinMiller  # noqa: N812

def main() -> None:
print("Making key files...")
make_key_files("rsa", 1024)
print("Key files generation successful.")

def generate_key(key_size: int) -> tuple[tuple[int, int], tuple[int, int]]:
print("Generating prime p...")
p = rabinMiller.generate_large_prime(key_size)
print("Generating prime q...")
q = rabinMiller.generate_large_prime(key_size)
n = p * q

print("Generating e that is relatively prime to (p - 1) * (q - 1)...")
while True:
e = random.randrange(2 ** (key_size - 1), 2 ** (key_size))
if cryptoMath.gcd(e, (p - 1) * (q - 1)) == 1:
break

print("Calculating d that is mod inverse of e...")
d = cryptoMath.find_mod_inverse(e, (p - 1) * (q - 1))

public_key = (n, e)
private_key = (n, d)
return (public_key, private_key)

def make_key_files(name: str, key_size: int) -> None:
if os.path.exists(f"{name}_pubkey.txt") or os.path.exists(f"{name}_privkey.txt"):
print("\nWARNING:")
print(
f'"{name}_pubkey.txt" or "{name}_privkey.txt" already exists. \n'
"Use a different name or delete these files and re-run this program."
)
sys.exit()

public_key, private_key = generate_key(key_size)
print(f"\nWriting public key to file {name}_pubkey.txt...")
with open(f"{name}_pubkey.txt", "w") as out_file:
out_file.write(f"{key_size},{public_key[0]},{public_key[1]}")

print(f"Writing private key to file {name}_privkey.txt...")
with open(f"{name}_privkey.txt", "w") as out_file:
out_file.write(f"{key_size},{private_key[0]},{private_key[1]}")

if __name__ == "__main__":
main()
```