fix: py3 in bitcoin.py: aes_encrypt_with_iv() and aes_decrypt_with_iv()

lib/bitcoin.py

@@ -117,7 +117,7 @@ def aes_encrypt_with_iv(key, iv, data):
         padlen = 16 - (len(data) % 16)
         if padlen == 0:
             padlen = 16
-        data += chr(padlen) * padlen
+        data += bytes([padlen]) * padlen
         e = AES.new(key, AES.MODE_CBC, iv).encrypt(data)
         return e
     else:
@@ -131,9 +131,9 @@ def aes_decrypt_with_iv(key, iv, data):
     if AES:
         cipher = AES.new(key, AES.MODE_CBC, iv)
         data = cipher.decrypt(data)
-        padlen = ord(data[-1])
+        padlen = data[-1]
         for i in data[-padlen:]:
-            if ord(i) != padlen:
+            if i != padlen:
                 raise InvalidPassword()
         return data[0:-padlen]
     else: