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import base64, binascii, hmac, os, socket, ssl, typing
def ssl_context(cert: str=None, key: str=None, verify: bool=True
) -> ssl.SSLContext:
context = ssl.SSLContext(ssl.PROTOCOL_TLS)
context.options |= ssl.OP_NO_SSLv2
context.options |= ssl.OP_NO_SSLv3
context.options |= ssl.OP_NO_TLSv1
context.load_default_certs()
if verify:
context.verify_mode = ssl.CERT_REQUIRED
if cert and key:
context.load_cert_chain(cert, keyfile=key)
return context
def ssl_wrap(sock: socket.socket, cert: str=None, key: str=None,
verify: bool=True, server_side: bool=False, hostname: str=None
) -> ssl.SSLSocket:
context = ssl_context(cert=cert, key=key, verify=verify)
return context.wrap_socket(sock, server_side=server_side,
server_hostname=hostname)
def constant_time_compare(a: typing.AnyStr, b: typing.AnyStr) -> bool:
return hmac.compare_digest(a, b)
import scrypt
def password(byte_n: int=32) -> str:
return binascii.hexlify(os.urandom(byte_n)).decode("utf8")
def salt(byte_n: int=64) -> str:
return base64.b64encode(os.urandom(byte_n)).decode("utf8")
def hash(given_salt: str, data: str):
return base64.b64encode(scrypt.hash(data, given_salt)).decode("utf8")
def hash_verify(salt: str, data: str, compare: str):
given_hash = hash(salt, data)
return constant_time_compare(given_hash, compare)
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import padding as a_padding
def rsa_encrypt(key_filename: str, data: bytes) -> str:
with open(key_filename, "rb") as key_file:
key_content = key_file.read()
key = serialization.load_pem_public_key(
key_content, backend=default_backend())
out = key.encrypt(data, a_padding.OAEP(
mgf=a_padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(), label=None))
return base64.b64encode(out).decode("iso-8859-1")
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.primitives import padding
def aes_key() -> bytes:
return os.urandom(32)
def aes_encrypt(key: bytes, data: str) -> str:
iv = os.urandom(16)
padder = padding.PKCS7(256).padder()
data_bytes = padder.update(data.encode("utf8"))+padder.finalize()
encryptor = Cipher(algorithms.AES(key), modes.CBC(iv),
backend=default_backend()).encryptor()
ct = encryptor.update(data_bytes)+encryptor.finalize()
return base64.b64encode(iv+ct).decode("latin-1")
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