Add secret key checking methods

monero/address.py

@@ -4,6 +4,7 @@ import struct
 from sha3 import keccak_256
 
 from . import base58
+from . import ed25519
 from . import numbers
 
 _ADDR_REGEX = re.compile(r'^[123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz]{95}$')
@@ -75,6 +76,20 @@ class Address(object):
         """
         return hexlify(self._decoded[1:33]).decode()
 
+    def check_private_view_key(self, key):
+        """Checks if private view key matches this address.
+
+        :rtype: bool
+        """
+        return ed25519.public_from_secret_hex(key) == self.view_key()
+
+    def check_private_spend_key(self, key):
+        """Checks if private spend key matches this address.
+
+        :rtype: bool
+        """
+        return ed25519.public_from_secret_hex(key) == self.spend_key()
+
     def with_payment_id(self, payment_id=0):
         """Integrates payment id into the address.
 

monero/ed25519.py

@@ -3,6 +3,7 @@
 #
 # Parts Copyright (c) 2016 The MoneroPy Developers. Released under the BSD 3-Clause
 
+from binascii import hexlify, unhexlify
 import hashlib
 import operator as _oper
 import sys as _sys
@@ -133,3 +134,10 @@ def scalarmultbase(e):
     if e & 1: Q = edwards(Q, B)
     return Q
 
+def public_from_secret(k):
+    keyInt = decodeint(k)
+    aG = scalarmultbase(keyInt)
+    return encodepoint(aG)
+
+def public_from_secret_hex(hk):
+    return hexlify(public_from_secret(unhexlify(hk))).decode()

monero/seed.py

@@ -137,14 +137,10 @@ class Seed(object):
         return self.sc_reduce(h.digest())
 
     def public_spend_key(self):
-        keyInt = ed25519.decodeint(unhexlify(self.secret_spend_key()))
-        aG = ed25519.scalarmultbase(keyInt)
-        return hexlify(ed25519.encodepoint(aG)).decode()
+        return ed25519.public_from_secret_hex(self.secret_spend_key())
 
     def public_view_key(self):
-        keyInt = ed25519.decodeint(unhexlify(self.secret_view_key()))
-        aG = ed25519.scalarmultbase(keyInt)
-        return hexlify(ed25519.encodepoint(aG)).decode()
+        return ed25519.public_from_secret_hex(self.secret_view_key())
 
     def public_address(self, net='mainnet'):
         """Returns the master :class:`Address <monero.address.Address>` represented by the seed.