54 lines
1.8 KiB
Python
54 lines
1.8 KiB
Python
from lib.pybitcointools import bitcoin as btctools
|
|
import hashlib
|
|
|
|
ecc_cache = {}
|
|
|
|
|
|
def encrypt(data, pubkey, ephemcurve=None, ciphername='aes-256-cbc'):
|
|
from lib import pyelliptic
|
|
curve, pubkey_x, pubkey_y, i = pyelliptic.ECC._decode_pubkey(pubkey)
|
|
if ephemcurve is None:
|
|
ephemcurve = curve
|
|
ephem = pyelliptic.ECC(curve=ephemcurve)
|
|
key = hashlib.sha512(ephem.raw_get_ecdh_key(pubkey_x, pubkey_y)).digest()
|
|
key_e, key_m = key[:32], key[32:]
|
|
pubkey = ephem.get_pubkey()
|
|
iv = pyelliptic.OpenSSL.rand(pyelliptic.OpenSSL.get_cipher(ciphername).get_blocksize())
|
|
ctx = pyelliptic.Cipher(key_e, iv, 1, ciphername)
|
|
ciphertext = iv + pubkey + ctx.ciphering(data)
|
|
mac = pyelliptic.hmac_sha256(key_m, ciphertext)
|
|
return key_e, ciphertext + mac
|
|
|
|
|
|
def split(encrypted):
|
|
iv = encrypted[0:16]
|
|
ciphertext = encrypted[16+70:-32]
|
|
|
|
return iv, ciphertext
|
|
|
|
|
|
def getEcc(privatekey=None):
|
|
from lib import pyelliptic
|
|
global eccs
|
|
if privatekey not in ecc_cache:
|
|
if privatekey:
|
|
publickey_bin = btctools.encode_pubkey(btctools.privtopub(privatekey), "bin")
|
|
publickey_openssl = toOpensslPublickey(publickey_bin)
|
|
privatekey_openssl = toOpensslPrivatekey(privatekey)
|
|
ecc_cache[privatekey] = pyelliptic.ECC(curve='secp256k1', privkey=privatekey_openssl, pubkey=publickey_openssl)
|
|
else:
|
|
ecc_cache[None] = pyelliptic.ECC()
|
|
return ecc_cache[privatekey]
|
|
|
|
|
|
def toOpensslPrivatekey(privatekey):
|
|
privatekey_bin = btctools.encode_privkey(privatekey, "bin")
|
|
return b'\x02\xca\x00\x20' + privatekey_bin
|
|
|
|
|
|
def toOpensslPublickey(publickey):
|
|
publickey_bin = btctools.encode_pubkey(publickey, "bin")
|
|
publickey_bin = publickey_bin[1:]
|
|
publickey_openssl = b'\x02\xca\x00 ' + publickey_bin[:32] + b'\x00 ' + publickey_bin[32:]
|
|
return publickey_openssl
|