def decrypt(private, ciphertext, output):
"""Decrypt ciphertext with private key.
Requires PRIVATE key file and the CIPHERTEXT encrypted with
the corresponding public key.
"""
privatekeydata = json.load(private)
assert 'pub' in privatekeydata
pub = load_public_key(privatekeydata['pub'])
log("Loading private key")
private_key_error = "Invalid private key"
assert 'key_ops' in privatekeydata, private_key_error
assert "decrypt" in privatekeydata['key_ops'], private_key_error
assert 'p' in privatekeydata, private_key_error
assert 'q' in privatekeydata, private_key_error
assert privatekeydata['kty'] == 'DAJ', private_key_error
_p = phe.util.base64_to_int(privatekeydata['p'])
_q = phe.util.base64_to_int(privatekeydata['q'])
private_key = phe.PaillierPrivateKey(pub, _p, _q)
log("Decrypting ciphertext")
enc = load_encrypted_number(ciphertext, pub)
out = private_key.decrypt(enc)
print(out, file=output)
def deserialize(b):
seckey_dict = json.loads(b)
sk_record = seckey_dict['secret_key']
sk = paillier.PaillierPrivateKey(
public_key=paillier.PaillierPublicKey(n=int(sk_record['n'])),
p=sk_record['p'],
q=sk_record['q'])
return SecretKey(sk)
def getKeys():
with open('custkeys.json', 'r') as file:
keys = json.load(file)
pub_key = paillier.PaillierPublicKey(n=int(keys['public_key']['n']))
priv_key = paillier.PaillierPrivateKey(pub_key,
keys['private_key']['p'],
keys['private_key']['q'])
return pub_key, priv_key
