read_pub_key_fiel.py

from Crypto.PublicKey import RSA  # nosec B413
from Crypto.Hash import SHA256  # nosec B413

# Read FIEL.cer
def read_fiel_cer(directory_file):
    try:
        public_key = None
        with open(directory_file + '.cer', 'rb') as f:
            public_key = RSA.import_key(f.read())
    except Exception as e:
        print(F'[ERROR read_fiel_cer] {e}, Type:{type(e)}')

    return public_key

# verify sign
def verify_fiel_sign(message_utf8, signature_b64, public_key):
    message_hash = SHA256.new(message_utf8)
    signature = base64.b64decode(signature_b64)
    try:
        pkcs1_15.new(public_key).verify(message_hash, signature)
        return True
    except Exception as e:
        print(F'[ERROR verify_fiel_sign] {e}, Type:{type(e)}')
        return False