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84 lines
2.5 KiB
Python
84 lines
2.5 KiB
Python
# -*- coding:utf-8 -*-
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import hashlib
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from Crypto.Cipher import PKCS1_OAEP, AES
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from Crypto.PublicKey import RSA
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from Crypto.Random import get_random_bytes
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from extensions.ext_redis import redis_client
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from extensions.ext_storage import storage
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def generate_key_pair(tenant_id):
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private_key = RSA.generate(2048)
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public_key = private_key.publickey()
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pem_private = private_key.export_key()
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pem_public = public_key.export_key()
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filepath = "privkeys/{tenant_id}".format(tenant_id=tenant_id) + "/private.pem"
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storage.save(filepath, pem_private)
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return pem_public.decode()
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prefix_hybrid = b"HYBRID:"
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def encrypt(text, public_key):
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if isinstance(public_key, str):
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public_key = public_key.encode()
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aes_key = get_random_bytes(16)
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cipher_aes = AES.new(aes_key, AES.MODE_EAX)
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ciphertext, tag = cipher_aes.encrypt_and_digest(text.encode())
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rsa_key = RSA.import_key(public_key)
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cipher_rsa = PKCS1_OAEP.new(rsa_key)
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enc_aes_key = cipher_rsa.encrypt(aes_key)
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encrypted_data = enc_aes_key + cipher_aes.nonce + tag + ciphertext
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return prefix_hybrid + encrypted_data
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def decrypt(encrypted_text, tenant_id):
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filepath = "privkeys/{tenant_id}".format(tenant_id=tenant_id) + "/private.pem"
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cache_key = 'tenant_privkey:{hash}'.format(hash=hashlib.sha3_256(filepath.encode()).hexdigest())
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private_key = redis_client.get(cache_key)
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if not private_key:
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try:
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private_key = storage.load(filepath)
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except FileNotFoundError:
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raise PrivkeyNotFoundError("Private key not found, tenant_id: {tenant_id}".format(tenant_id=tenant_id))
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redis_client.setex(cache_key, 120, private_key)
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rsa_key = RSA.import_key(private_key)
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cipher_rsa = PKCS1_OAEP.new(rsa_key)
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if encrypted_text.startswith(prefix_hybrid):
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encrypted_text = encrypted_text[len(prefix_hybrid):]
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enc_aes_key = encrypted_text[:rsa_key.size_in_bytes()]
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nonce = encrypted_text[rsa_key.size_in_bytes():rsa_key.size_in_bytes() + 16]
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tag = encrypted_text[rsa_key.size_in_bytes() + 16:rsa_key.size_in_bytes() + 32]
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ciphertext = encrypted_text[rsa_key.size_in_bytes() + 32:]
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aes_key = cipher_rsa.decrypt(enc_aes_key)
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cipher_aes = AES.new(aes_key, AES.MODE_EAX, nonce=nonce)
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decrypted_text = cipher_aes.decrypt_and_verify(ciphertext, tag)
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else:
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decrypted_text = cipher_rsa.decrypt(encrypted_text)
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return decrypted_text.decode()
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class PrivkeyNotFoundError(Exception):
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pass
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