class Crypto(object): def __init__(self): self.G = generator_secp256k1 self._r = self.G.order() def generate_key_pair(self): self.private_key = ecdsa.util.randrange(pow(2, 256)) % self._r self.eck = EC_KEY(number_to_string(self.private_key, self._r)) self.public_key = point_to_ser(self.private_key * self.G, True) def export_public_key(self): """ serialization of public key """ return bytes.hex(self.public_key) def encrypt(self, message, pubkey): res = self.eck.encrypt_message(message.encode('utf-8'), bytes.fromhex(pubkey)) return res.decode('utf-8') def decrypt(self, message): return self.eck.decrypt_message(message) def hash(self, text, algorithm='sha224'): h = hashlib.new(algorithm) h.update(text.encode('utf-8')) return h.digest()
class Crypto: """ Functions related to cryptography """ def __init__(self): self.G = generator_secp256k1 self._r = self.G.order() self.private_key, self.eck, self.public_key = None, None, None def generate_key_pair(self): """ generate encryption/decryption pair """ self.private_key = ecdsa.util.randrange(self._r) self.eck = EC_KEY(number_to_string(self.private_key, self._r)) self.public_key = point_to_ser(self.private_key * self.G, True) def export_private_key(self): """ Export private key as hex string """ if self.private_key: return bytes.hex(number_to_string(self.private_key, self._r)) else: return None def restore_from_privkey(self, secret_string): "restore key pair from private key expressed in a hex form" self.private_key = string_to_number(bytes.fromhex(secret_string)) self.eck = EC_KEY(bytes.fromhex(secret_string)) self.public_key = point_to_ser(self.private_key * self.G, True) def export_public_key(self): """ serialization of public key """ return bytes.hex(self.public_key) def encrypt(self, message, pubkey): """ encrypt message with pubkey """ try: res = self.eck.encrypt_message(message.encode('utf-8'), bytes.fromhex(pubkey)) return res.decode('utf-8') except Exception as e: # grrr.. bitcoin.py raises 'Exception' :/ raise EncryptError( "Bitcoin.py raised '{}' during Crypto.encrypt".format( type(e).__name__), e, pubkey, message) from e def decrypt(self, message): """ decrypt message """ try: return self.eck.decrypt_message(message) except (InvalidPassword, Exception) as e: raise DecryptError( "Bitcoin.py raised '{}' during Crypto.decrypt".format( type(e).__name__), e, self.private_key, message) from e @staticmethod def hash(text): ''' Returns sha256(sha256(text)) as bytes. text may be bytes or str. ''' return Hash(text) # bitcoin.Hash is sha256(sha256(x))
class Crypto(object): """ This class used for tasks related to cryptography """ def __init__(self): self.G = generator_secp256k1 self._r = self.G.order() def generate_key_pair(self): "generate encryption/decryption pair" self.private_key = ecdsa.util.randrange(self._r) self.eck = EC_KEY(number_to_string(self.private_key, self._r)) self.public_key = point_to_ser(self.private_key * self.G, True) def export_private_key(self): "Export private key as hex string" if self.private_key: return bytes.hex(number_to_string(self.private_key, self._r)) else: return None def restore_from_privkey(self, secret_string): "restore key pair from private key expressed in a hex form" self.private_key = string_to_number(bytes.fromhex(secret_string)) self.eck = EC_KEY(bytes.fromhex(secret_string)) self.public_key = point_to_ser(self.private_key * self.G, True) def export_public_key(self): """ serialization of public key """ return bytes.hex(self.public_key) def encrypt(self, message, pubkey): "encrypt message with pubkey" res = self.eck.encrypt_message(message.encode('utf-8'), bytes.fromhex(pubkey)) return res.decode('utf-8') def decrypt(self, message): "decrypt message" return self.eck.decrypt_message(message) def hash(self, text, algorithm='sha224'): "method for hashing the text" h = hashlib.new(algorithm) h.update(text.encode('utf-8')) return h.digest()