62 lines
2.4 KiB
Python
62 lines
2.4 KiB
Python
import base64, binascii, hmac, os, socket, ssl, typing
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def ssl_context(cert: str=None, key: str=None, verify: bool=True
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) -> ssl.SSLContext:
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context = ssl.SSLContext(ssl.PROTOCOL_TLS)
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context.options |= ssl.OP_NO_SSLv2
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context.options |= ssl.OP_NO_SSLv3
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context.options |= ssl.OP_NO_TLSv1
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context.load_default_certs()
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if verify:
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context.verify_mode = ssl.CERT_REQUIRED
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if cert and key:
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context.load_cert_chain(cert, keyfile=key)
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return context
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def ssl_wrap(sock: socket.socket, cert: str=None, key: str=None,
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verify: bool=True, server_side: bool=False, hostname: str=None
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) -> ssl.SSLSocket:
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context = ssl_context(cert=cert, key=key, verify=verify)
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return context.wrap_socket(sock, server_side=server_side,
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server_hostname=hostname)
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def constant_time_compare(a: typing.AnyStr, b: typing.AnyStr) -> bool:
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return hmac.compare_digest(a, b)
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import scrypt
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def password(byte_n: int=32):
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return binascii.hexlify(os.urandom(byte_n)).decode("utf8")
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def salt(byte_n: int=64) -> bytes:
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return base64.b64encode(os.urandom(byte_n)).decode("utf8")
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def hash(given_salt: str, data: str):
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return base64.b64encode(scrypt.hash(data, given_salt)).decode("utf8")
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def hash_verify(salt: str, data: str, compare: str):
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given_hash = hash(salt, data)
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return constant_time_compare(given_hash, compare)
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from cryptography.hazmat.backends import default_backend
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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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def a_encrypt(key_filename: str, data: str):
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with open(key_filename, "rb") as key_file:
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key_content = key_file.read()
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key = serialization.load_pem_public_key(
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key_content, backend=default_backend())
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out = key.encrypt(data.encode("utf8"), padding.OAEP(
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mgf=padding.MGF1(algorithm=hashes.SHA256()),
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algorithm=hashes.SHA256(), label=None))
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return base64.b64encode(out).decode("iso-8859-1")
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def a_decrypt(key_filename: str, data: str):
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with open(key_filename, "rb") as key_file:
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key_content = key_file.read()
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key = serialization.load_pem_private_key(
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key_content, password=None, backend=default_backend())
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out = key.decrypt(base64.b64decode(data), padding.OAEP(
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mgf=padding.MGF1(algorithm=hashes.SHA256()),
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algorithm=hashes.SHA256(), label=None))
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return out.decode("utf8")
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