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138 lines
3.8 KiB
Python
138 lines
3.8 KiB
Python
from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives.asymmetric import rsa
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from cryptography.hazmat.primitives import serialization
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.primitives.asymmetric import padding
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import os
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key_dir = os.path.join(os.path.expanduser('~'),'.keys','komrade')
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if not os.path.exists(key_dir): os.makedirs(key_dir)
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PATH_PRIVATE_KEY=os.path.join(key_dir,'private_key.pem')
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PATH_PUBLIC_KEY=os.path.join(key_dir,'public_key.pem')
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### CREATING KEYS
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def new_keys(save=True,password=None):
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private_key = rsa.generate_private_key(
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public_exponent=65537,
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key_size=2048,
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backend=default_backend()
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)
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public_key = private_key.public_key()
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if save:
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save_private_key(private_key,password=password)
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save_public_key(public_key)
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return private_key,public_key
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def save_private_key(private_key,fn=PATH_PRIVATE_KEY,password=None, return_instead=False):
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pem = private_key.private_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PrivateFormat.PKCS8,
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encryption_algorithm=serialization.NoEncryption() if not password else serialization.BestAvailableEncryption(password.encode())
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)
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if return_instead: return pem
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with open(fn,'wb') as f: f.write(pem)
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def save_public_key(public_key,fn=PATH_PUBLIC_KEY,return_instead=False):
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pem = public_key.public_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PublicFormat.SubjectPublicKeyInfo
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)
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if return_instead: return pem
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with open(fn,'wb') as f: f.write(pem)
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### LOADING KEYS
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def load_keys():
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return (load_private_key_from_file(), load_public_key_from_file())
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def load_private_key(pem,password=None):
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return serialization.load_pem_private_key(
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pem,
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password=password.encode() if password else None,
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backend=default_backend()
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)
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def load_private_key_from_file(fn=PATH_PRIVATE_KEY,password=None):
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with open(fn, "rb") as key_file:
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return load_private_key(key_file.read(), password)
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def load_public_key(pem):
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return serialization.load_pem_public_key(
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pem,
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backend=default_backend()
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)
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def load_public_key_from_file(fn=PATH_PUBLIC_KEY):
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with open(fn, "rb") as key_file:
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return load_public_key(key_file.read())
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### DE/ENCRYPTING
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def encrypt_msg(message, public_key):
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return public_key.encrypt(
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str(message).encode(),
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padding.OAEP(
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mgf=padding.MGF1(algorithm=hashes.SHA256()),
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algorithm=hashes.SHA256(),
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label=None
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)
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)
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def decrypt_msg(encrypted, private_key):
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return private_key.decrypt(
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encrypted,
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padding.OAEP(
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mgf=padding.MGF1(algorithm=hashes.SHA256()),
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algorithm=hashes.SHA256(),
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label=None
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)
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)
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### SIGNING/VERIFYING
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def sign_msg(message, private_key):
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return private_key.sign(
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message,
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padding.PSS(
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mgf=padding.MGF1(hashes.SHA256()),
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salt_length=padding.PSS.MAX_LENGTH
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),
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hashes.SHA256()
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)
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def verify_msg(message, signature, public_key):
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return public_key.verify(
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signature,
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message,
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padding.PSS(
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mgf=padding.MGF1(hashes.SHA256()),
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salt_length=padding.PSS.MAX_LENGTH
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),
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hashes.SHA256()
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)
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# #private_key,public_key = new_keys()
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# private_key,public_key = load_keys()
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# #print(private_key)
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# #print(public_key)
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# #enc = encrypt_msg('Drive your plow over the bones of the dead', public_key)
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# #print(enc)
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# dec = decrypt_msg(enc,private_key)
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# #print(dec)
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# msg = b'hello'
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# signature = sign_msg(msg,private_key)
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# #print(encrypt_msg(b'hello',public_key))
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# print(verify_msg(msg+b'!!',signature,public_key)) |